CN115378043B - Synchronous power generation system, grid-connected control method and device thereof and electronic equipment - Google Patents
Synchronous power generation system, grid-connected control method and device thereof and electronic equipment Download PDFInfo
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- 238000010248 power generation Methods 0.000 title claims abstract description 114
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a synchronous power generation system, a grid-connected control method and device thereof, electronic equipment and a readable storage medium, and relates to the field of power electronics and power transmission, wherein the method comprises the following steps: after the synchronous power generation system is connected with a power grid, acquiring active current and reactive current corresponding to the three-phase current of the generator according to the three-phase current of the generator and the voltage angle of the power grid; acquiring a rotating speed command value according to the active current, the intermediate direct current voltage command value and the grid voltage angular frequency; obtaining a modulation wave according to reactive current, a reactive current instruction value, an exciting current reference value and an exciting current feedback value; therefore, the frequency and voltage stability of the power system are actively supported by a grid-connected mode of the new energy through the synchronous generator pair grid connection; by adopting a power control mode of convenient and rapid power feedback control and direct-current voltage feedback control, stable control of grid-connected power is realized, and the frequency and voltage stability of grid connection are ensured.
Description
Technical Field
The present invention relates to the field of power electronics and power transmission, and in particular, to a synchronous power generation system, and a grid-connected control method, a device, an electronic apparatus, and a readable storage medium thereof.
Background
With the continuous pushing of the project of constructing a novel electric power system taking new energy as a main body, the electric power system gradually presents the characteristic of double high, which leads to continuous reduction of inertia, continuous weakening of immunity and continuous increase of safety risk of the whole electric power system. The high permeability of new energy power generation systems such as wind power, photovoltaic and the like is a main factor for reducing the frequency and voltage stability of the power system by new energy grid connection. The main appearance is that: the new energy power generation system has random fluctuation, and lacks reliable inertial response, so that the frequency adjustment capability of the system is obviously reduced; in addition, the traditional synchronous generator is replaced by a grid-connected converter in a large scale, and the support capability of transient voltage of power electronic devices is insufficient, so that the risk of system voltage breakdown is increased.
Aiming at the aspect of frequency stability, the virtual synchronous machine (VSG) technology can improve the inertial response of a new energy system, but the VSG technology essentially only changes the control strategy of a new energy converter, and the characteristics of narrow voltage and current tolerance range of the converter still can influence the stability of a new energy power grid. Aiming at the aspect of voltage stability, a Crowbar circuit (an overvoltage protection circuit), a direct current Chopper circuit, an energy storage device, a new generation of camera and other hardware auxiliary equipment are adopted to improve the reactive support capacity of a new energy system, but the limitation of inherent voltage endurance capacity of a power electronic device brings a bottleneck to a voltage ride through technology; the cameras are connected into the two ends of the direct current receiver in parallel, and the mode that new energy is directly connected into the network through power electronic equipment is not changed. That is, the above method increases the complexity of the converter control and the running cost of the new energy electric field, and is not technically as mature as the conventional unit.
Therefore, how to conveniently and rapidly control the grid connection of the new energy equipment and improve the frequency and voltage stability of the new energy grid connection is a problem which needs to be solved rapidly nowadays.
Disclosure of Invention
The invention aims to provide a synchronous power generation system, a grid-connected control method and device thereof, electronic equipment and a readable storage medium, so as to conveniently and rapidly control grid connection of new energy equipment and improve frequency and voltage stability of new energy grid connection.
In order to solve the technical problems, the invention provides a grid-connected control method of a synchronous power generation system, which comprises the following steps:
after the synchronous power generation system is connected with a power grid, acquiring active current and reactive current corresponding to the three-phase current of the generator according to the three-phase current of the generator and the voltage angle of the power grid;
acquiring a rotating speed command value according to the active current, the intermediate direct current voltage command value and the grid voltage angular frequency; the rotating speed command value is used for adjusting the rotating speed of a motor in the synchronous power generation system; the intermediate direct-current voltage is the direct-current voltage of the new energy power generation equipment and/or the energy storage converter for supplying power to the motor;
obtaining a modulation wave according to the reactive current, the reactive current instruction value, the exciting current reference value and the exciting current feedback value; the modulation wave is used for adjusting exciting current of a generator in the synchronous power generation system, and the generator and the motor are coaxially connected synchronous generator pairs.
Optionally, the obtaining the rotation speed command value according to the active current, the intermediate direct current voltage command value and the grid voltage angular frequency includes:
comparing the intermediate direct-current voltage with the intermediate direct-current voltage command value by using a first comparator to obtain a direct-current voltage compensation value; the direct-current voltage compensation value is the difference between the intermediate direct-current voltage command value and the intermediate direct-current voltage;
acquiring an active current instruction value corresponding to the direct-current voltage compensation value by using a first controller;
comparing the active current with the active current command value by using a second comparator to obtain an active current compensation value; wherein the active current compensation value is the difference between the active current command value and the active current;
acquiring a rotating speed compensation value corresponding to the active current compensation value by using a second controller;
comparing the rotation speed compensation value with a rotation speed command reference value corresponding to the grid voltage angular frequency by using a third comparator to obtain the rotation speed command value; the rotating speed command value is the sum of the rotating speed compensation value and the rotating speed command reference value, and the rotating speed command reference value is the product of the grid voltage angular frequency and 1/2 pi and the preset conversion proportion.
Optionally, the first controller and the second controller are both proportional-integral controllers.
Optionally, the obtaining the modulation wave according to the reactive current, the reactive current instruction value, the exciting current reference value and the exciting current feedback value includes:
comparing the reactive current instruction value with the reactive current by using a fourth comparator to obtain a reactive current compensation value; wherein the reactive current compensation value is the difference between the reactive current command value and the reactive current;
obtaining an exciting current compensation value corresponding to the reactive current compensation value by using a third controller;
comparing the exciting current compensation value, the exciting current reference value and the exciting current feedback value by using a fifth comparator to obtain a current comparison value; wherein the current comparison value is a difference between the excitation current reference value and the excitation current compensation value and a difference between the excitation current feedback value;
and acquiring the modulation wave corresponding to the current comparison value by using a fourth controller.
Optionally, the reactive current command value is a first current command value of high-voltage fault ride-through, a second current command value of low-voltage fault ride-through or a third current command value of normal operation.
Optionally, before obtaining the active current and the reactive current corresponding to the three-phase current of the generator according to the three-phase current of the generator and the voltage angle of the power grid, the method further includes:
and acquiring the grid voltage angular frequency and the grid voltage angle corresponding to the three-phase voltage of the grid through a phase-locked loop.
Optionally, the obtaining, by using a phase-locked loop, the grid voltage angular frequency and the grid voltage angle corresponding to the grid three-phase voltage includes:
transforming the three-phase voltage of the power grid by using a preset coordinate transformation matrix according to the last power grid voltage angle to obtain a q-axis component of the power grid voltage corresponding to the three-phase voltage of the power grid;
obtaining an angular frequency compensation value corresponding to the q-axis component of the power grid voltage by using a fifth controller;
comparing the angular frequency compensation value with an angular frequency reference value by using a sixth comparator to obtain the grid voltage angular frequency; wherein the grid voltage angular frequency is the sum of the angular frequency compensation value and the angular frequency reference value;
and integrating and taking the margin of the grid voltage angular frequency to obtain the current grid voltage angle.
Optionally, the obtaining the active current and the reactive current corresponding to the three-phase current of the generator according to the three-phase current of the generator and the voltage angle of the power grid includes:
Transforming the three-phase current of the generator by using a preset coordinate transformation matrix according to a target angle to obtain the active current and the reactive current; wherein the target angle is the difference between the grid voltage angle and pi/6.
Optionally, the method further comprises:
the generator control device sends the rotating speed command value to the motor control device so as to control the motor control device to control a target inverter in the synchronous power generation system according to the rotating speed command value; wherein the target inverter is configured to power the motor with the intermediate dc voltage;
controlling a generator rectifier in the synchronous power generation system according to the modulation wave so as to adjust exciting current of the generator; wherein the generator rectifier is configured to provide excitation current for the generator.
Optionally, the method further comprises:
before the synchronous power generation system is connected with a power grid, acquiring power grid voltage angular frequency and power grid voltage angle corresponding to three-phase voltage of the power grid through a phase-locked loop;
acquiring a presynchronization rotating speed command value according to the grid voltage angular frequency, the grid voltage angle and the three-phase voltage of the generator stator; wherein the presynchronized rotation speed command value is used for adjusting the rotation speed of the motor;
And controlling motor control equipment to adjust the rotating speed of the motor according to the presynchronized rotating speed command value.
Optionally, the obtaining the presynchronized rotation speed command value according to the grid voltage angular frequency, the grid voltage angle and the three-phase voltage of the generator stator includes:
according to the power grid voltage angle, transforming the three-phase voltage of the generator stator by using a preset coordinate transformation matrix to obtain a generator voltage q-axis component;
obtaining a presynchronization rotation speed compensation value corresponding to the generator voltage q-axis component by using a sixth controller;
comparing the presynchronization rotation speed compensation value with a rotation speed command reference value corresponding to the grid voltage angular frequency by using a seventh comparator to obtain the presynchronization rotation speed command value; the presynchronization rotating speed command value is the difference between the rotating speed command reference value and the presynchronization rotating speed compensation value, and the rotating speed command reference value is the product of the power grid voltage angular frequency and 1/2 pi and the product of the preset conversion proportion.
The invention also provides a grid-connected control device of the synchronous power generation system, which comprises:
the acquisition module is used for acquiring active current and reactive current corresponding to the three-phase current of the generator according to the three-phase current of the generator and the voltage angle of the power grid after the synchronous power generation system is connected with the power grid;
The active control module is used for acquiring a rotating speed command value according to the active current, the intermediate direct current voltage command value and the grid voltage angular frequency; the rotating speed command value is used for adjusting the rotating speed of a motor in the synchronous power generation system;
the reactive power control module is used for obtaining modulation waves according to the reactive current, the reactive current instruction value, the exciting current reference value and the exciting current feedback value; the modulation wave is used for adjusting the exciting current of a generator in the synchronous power generation system.
The invention also provides an electronic device, comprising:
a memory for storing a computer program;
and the processor is used for realizing the steps of the grid-connected control method of the synchronous power generation system when executing the computer program.
The invention also provides a synchronous power generation system, which comprises: an inverter, a pair of coaxially connected synchronous generators, a generator rectifier, a generator control device and a motor control device; wherein the generator control device is the electronic device as described above.
The present invention also provides a readable storage medium having a computer program stored thereon, which when executed by a processor, implements the steps of the grid-tie control method of a synchronous power generation system as described above.
The invention provides a grid-connected control method of a synchronous power generation system, which comprises the following steps: after the synchronous power generation system is connected with a power grid, acquiring active current and reactive current corresponding to the three-phase current of the generator according to the three-phase current of the generator and the voltage angle of the power grid; acquiring a rotating speed command value according to the active current, the intermediate direct current voltage command value and the grid voltage angular frequency; the rotating speed command value is used for adjusting the rotating speed of a motor in the synchronous power generation system; the middle direct-current voltage is the direct-current voltage of the new energy power generation equipment and/or the energy storage converter for supplying power to the motor; obtaining a modulation wave according to reactive current, a reactive current instruction value, an exciting current reference value and an exciting current feedback value; the modulation wave is used for adjusting exciting current of a generator in the synchronous power generation system, and the generator and the motor are a synchronous generator pair which is coaxially connected;
therefore, the frequency and voltage stability of the power system are actively supported by a grid-connected mode that new energy is connected through a synchronous generator pair (MGP); the stable control of the grid-connected power is realized by acquiring a rotating speed instruction value for adjusting the rotating speed of the motor and a modulation wave for adjusting the exciting current of the generator and adopting a power control mode of convenient and rapid power feedback control and direct-current voltage feedback control, so that the frequency and voltage stability of grid connection are ensured. In addition, the invention also provides a grid-connected control device of the synchronous power generation system, electronic equipment, the synchronous power generation system and a readable storage medium, and the grid-connected control device has the same beneficial effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart of a grid-connected control method of a synchronous power generation system according to an embodiment of the present invention;
fig. 2 is a schematic topology diagram of a grid-connected control system of a synchronous power generation system according to an embodiment of the present invention;
FIG. 3 is a schematic block diagram of a grid-connected power control principle of another grid-connected control method of a synchronous power generation system according to an embodiment of the present invention;
FIG. 4 is a schematic block diagram of a grid-connected presynchronization control principle of another grid-connected control method of a synchronous power generation system according to an embodiment of the present invention;
fig. 5 is a diagram showing a grid-connected presynchronization effect of another grid-connected control method of a synchronous power generation system according to an embodiment of the present invention;
FIG. 6 is a diagram showing the effect of increasing the power of another grid-connected control method of the synchronous power generation system according to the embodiment of the present invention;
Fig. 7 is a diagram showing reactive power increasing effects of another grid-connected control method of a synchronous power generation system according to an embodiment of the present invention;
fig. 8 is a diagram showing the effects of network voltage and reactive power during low-voltage fault ride-through according to another method for controlling grid connection of a synchronous power generation system according to an embodiment of the present invention;
fig. 9 is a diagram showing the effects of network voltage and reactive power during high-voltage fault ride-through according to another method for controlling grid connection of a synchronous power generation system according to an embodiment of the present invention;
fig. 10 is an effect display diagram of a grid-connected control method of a synchronous power generation system provided by an embodiment of the present invention under an abnormal grid frequency condition;
fig. 11 is an effect display diagram of another grid frequency abnormality situation of the grid-connected control method of the synchronous power generation system according to the embodiment of the present invention;
fig. 12 is an effect display diagram of another grid frequency abnormality of the grid-connected control method of the synchronous power generation system according to the embodiment of the present invention;
fig. 13 is a block diagram of a grid-connected control device of a synchronous power generation system according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a flowchart of a grid-connected control method of a synchronous power generation system according to an embodiment of the present invention. The method may include:
step 101: and after the synchronous power generation system is connected with the power grid, acquiring active current and reactive current corresponding to the three-phase current of the generator according to the three-phase current of the generator and the voltage angle of the power grid.
Specifically, for the specific structure of the synchronous power generation system in the present embodiment, it may be set by a designer according to the practical scenario and the user's requirements, and the synchronous power generation system may include an inverter (DC/AC, direct current/alternating current), a coaxially connected synchronous generator pair (MGP), a generator rectifier (e.g., vienna Rectifiler in fig. 2, a vienna rectifier), a generator control device (e.g., GSC in fig. 2), and a motor control device (e.g., MSC in fig. 2); the new energy power generation equipment and/or the energy storage converter can be connected to a power grid through a synchronous generator pair (namely a motor and a generator), namely the intermediate direct-current voltage supplied by the new energy power generation equipment and/or the energy storage converter can supply power to the motor of the synchronous generator pair through the inverter, and the generator of the synchronous generator pair can be connected to a power grid device (such as an alternating-current 50Hz-690V power supply mode) for grid connection; the grid voltage provides excitation current for the generator through the generator rectifier. As shown in fig. 2, when the new energy power generation device includes a wind power generation device and a photovoltaic power generation device, the wind power generation device may be connected to a rectifier, the photovoltaic power generation device may be connected to a Boost circuit (DC/DC), and direct currents (i.e., intermediate direct voltages) output by the rectifier, the Boost circuit, and an energy storage converter (Power Conversion System, PCS) may be input to an inverter for supplying power to the motor, and the energy storage converter may perform peak clipping and valley filling; the motor control device (MSC) may adjust the rotational speed of the motor by controlling the output of the inverter, and the generator control device (GSC) may adjust the exciting current of the generator by controlling the generator rectifier.
It can be understood that the three-phase current of the generator in this step can be the three-phase current output by the generator; in the step, the active current and the reactive current corresponding to the three-phase current of the generator can be obtained by utilizing the angles of the three-phase current of the generator and the voltage of the power grid, so that the active current control and the reactive current control of the power control after grid connection are realized by utilizing the active current and the reactive current.
Specifically, for the specific mode of acquiring the active current and the reactive current corresponding to the three-phase current of the generator according to the three-phase current and the voltage angle of the power grid after the synchronous power generation system and the power grid are connected in the step, the active current and the reactive current can be set by a designer according to the use scene and the user requirement, as shown in fig. 3, the processor in the step can utilize the preset coordinate transformation matrix (T abc/dq ) For three-phase current of generator (i abc ) Conversion is performed to obtain an active current (i) d ) And reactive current (i) q ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein the target angle is a grid voltage angle (θ g ) And pi/6.
It should be noted that, the method provided by the embodiment may further include a process of acquiring the grid voltage angle; for example, before this step, the processor may obtain the grid voltage angular frequency and the grid voltage angle corresponding to the grid three-phase voltage through the phase-locked loop, that is, the grid three-phase voltage may obtain the grid voltage angular frequency and the grid voltage angle output by phase locking through the phase-locked loop. As shown in fig. 4, the processor determines the current grid voltage angle (θ g ) Using a predetermined coordinate transformation matrix (T abc/dq ) For the three-phase voltage (U) gabc ) Transforming to obtain a q-axis component (U) of the grid voltage corresponding to the three-phase voltage of the grid gq ) The method comprises the steps of carrying out a first treatment on the surface of the Obtaining the angular frequency corresponding to the q-axis component of the grid voltage by using a fifth controller (such as PI (proportional integral) controller in FIG. 4)Rate compensation value (Δω) g ) The method comprises the steps of carrying out a first treatment on the surface of the Using a sixth comparator (such as PI in fig. 4), the angular frequency compensation value and the angular frequency reference value (ω) 0 ) Comparing to obtain the voltage angular frequency (omega) g ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein the grid voltage angular frequency is the sum of the angular frequency compensation value and the angular frequency reference value; integrating (1/s) and taking the remainder (mod (2 pi)) of the grid voltage angular frequency to obtain the current grid voltage angle (theta) g ) The method comprises the steps of carrying out a first treatment on the surface of the The current power grid voltage angle may be a power grid voltage angle obtained at the current time, and the last power grid voltage angle may be a power grid voltage angle obtained at the last time. Correspondingly, the processor can further take the current power grid voltage angle as the last power grid voltage angle, and continue to acquire the next power grid voltage angle.
Specifically, the process of acquiring the voltage angle of the power grid in this embodiment may be implemented by the power grid phase identification link shown in fig. 4, where the power grid phase identification link is implemented by using a digital PLL (phase locked loop), as shown in fig. 4, T abc/dq Is a preset coordinate transformation matrix, PI is a proportional integral controller, 1/s is an integral link, mod (2 PI) is a remainder link, omega g For the angular frequency of the network voltage, θ, obtained through the PLL g The power grid voltage angle (theta is more than or equal to 0) output for phase locking g ≤2π)。
Step 102: acquiring a rotating speed command value according to the active current, the intermediate direct current voltage command value and the grid voltage angular frequency; the rotating speed command value is used for adjusting the rotating speed of a motor in the synchronous power generation system; the intermediate direct-current voltage is the direct-current voltage of the new energy power generation equipment and/or the energy storage converter for supplying power to the motor.
It is understood that the rotation speed command value in this step may be a command value for adjusting the rotation speed of the motor, for example, the motor control apparatus may control the target inverter in the synchronous power generation system according to the rotation speed command value to control the target inverter to adjust the rotation speed of the motor, such as to adjust the rotation speed of the motor to the rotation speed command value, by changing the current or voltage that supplies power to the motor. In the step, the rotation speed command value is obtained by utilizing the active current, the intermediate direct current voltage command value and the grid voltage angular frequency, and the active current control based on the direct current voltage feedback is realized, so that the active frequency modulation is realized.
Specifically, for the specific manner of obtaining the rotation speed command value according to the active current, the intermediate dc voltage command value and the grid voltage angular frequency in this step, the rotation speed command value may be set by a designer according to the usage scenario and the user requirement, as shown in fig. 3, the processor uses the first comparator to compare the intermediate dc voltage (U dc ) And an intermediate DC voltage command value (U dcref ) Comparing to obtain DC voltage compensation value (DeltaU dc ) The method comprises the steps of carrying out a first treatment on the surface of the The direct-current voltage compensation value is the difference between the intermediate direct-current voltage command value and the intermediate direct-current voltage; acquiring an active current command value (i) corresponding to the DC voltage compensation value by using a first controller (PI) dref ) The method comprises the steps of carrying out a first treatment on the surface of the With the second comparator, the active current (i d ) Comparing the current command value with the active current command value to obtain an active current compensation value (delta i) d ) The method comprises the steps of carrying out a first treatment on the surface of the The active current compensation value is the difference between the active current command value and the active current; obtaining a rotation speed compensation value (delta n) corresponding to the active current compensation value by using a second controller (PI); the third comparator is used for comparing the rotation speed compensation value with the grid voltage angular frequency (omega g ) The corresponding rotation speed command reference value is compared to obtain a rotation speed command value (n ref ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein the rotation speed command value is the sum of the rotation speed compensation value and a rotation speed command reference value, and the rotation speed command reference value is the product of the power grid voltage angular frequency and 1/2 pi and a preset conversion ratio (T f/n ) The preset conversion ratio can be the conversion ratio of the preset network voltage angular frequency corresponding to the rated rotation speed of the generator.
It should be noted that, the grid-connected control method of the synchronous power generation system provided in this embodiment may be applied to a generator control device, or may be applied to other electronic devices (such as an upper computer), which is not limited in this embodiment. For example, when the grid-connected control method provided in the present embodiment is applied to the generator control device, after step 102, the processor of the generator control device may further send a rotation speed command value to the motor control device, so as to control the motor control device to control the target inverter in the synchronous power generation system according to the rotation speed command value; wherein the target inverter is configured to power the motor with the intermediate dc voltage.
Step 103: obtaining a modulation wave according to reactive current, a reactive current instruction value, an exciting current reference value and an exciting current feedback value; the modulation wave is used for adjusting exciting current of a generator in the synchronous power generation system, and the generator and the motor are a synchronous generator pair which is coaxially connected.
It will be appreciated that the modulated wave in this step may be used for the excitation current of the generator, for example, the generator control apparatus may control a generator inverter (e.g., a vienna rectifier in fig. 2) in the synchronous power generation system according to the modulated wave to control the generator inverter to adjust the excitation current of the generator. In the step, the reactive current instruction value, the exciting current reference value and the exciting current feedback value are utilized to obtain the modulation wave, so that the reactive current control based on the power feedback can be realized, and the reactive voltage regulation is realized.
Specifically, the reactive current command value in this step may be the first current command value of the high voltage fault ride through (i in fig. 3 qHVRT ) A second current command value for low voltage fault ride through (i in fig. 3 qLVRT ) Or a third current command value for normal operation (e.g., i in fig. 3 qref ) So as to realize the high-low penetration reactive power support control; for example, when high-low voltage fault ride through is performed, the reactive current command value may be a first current command value or a second current command value provided by the power generation system, and when the power generation system is in normal operation, the reactive current command value may be a third current command value issued by the upper computer.
The specific manner of obtaining the modulation wave according to the reactive current, the reactive current command value, the exciting current reference value and the exciting current feedback value in this step may be set by a designer according to the practical scenario and the user requirement, as shown in fig. 3, the processor may use a fourth comparator to obtain the reactive current command value (i qHVRT 、i qref Or i qLVRT ) And reactive current (i) q ) And comparing to obtain reactive current compensation value (delta i) q ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein the reactive current compensation value is reactive powerThe difference between the current command value and the reactive current; obtaining an exciting current compensation value (delta I) corresponding to the reactive current compensation value by using a third controller (PI) f ) The method comprises the steps of carrying out a first treatment on the surface of the The fifth comparator is used for comparing the exciting current compensation value and the exciting current reference value (I f0 * ) And the excitation current feedback value (I f ) The comparison is performed to obtain a current comparison value (Δi f ) The method comprises the steps of carrying out a first treatment on the surface of the The current comparison value is the difference between the exciting current reference value and the exciting current compensation value and the exciting current feedback value; and acquiring a modulation wave (m) corresponding to the current comparison value by using a fourth controller.
Specifically, when the grid-connected control method provided by the embodiment is applied to the generator control device, after this step, the processor of the generator control device may further control the generator rectifier in the synchronous power generation system according to the modulation wave to adjust the excitation current of the generator; wherein, the generator rectifier is used for providing exciting current for the generator.
It should be noted that, as shown in fig. 3, the grid-connected power control process of the synchronous power generation system and the grid after grid connection provided in this embodiment may include 3 links, i.e., active current control, reactive current control, and high-low penetration reactive support control; in FIG. 3, an intermediate DC voltage U dc And instruction value U dcref The comparison is carried out, and an active current instruction value i is obtained through a PI regulator dref Three-phase current i of generator abc Obtaining active current i through coordinate transformation d And reactive current i q ，i dref And i d The comparison is carried out, a rotating speed command compensation value delta n is obtained through a PI regulator, and the network voltage angular frequency omega is overlapped g Corresponding speed command reference value is thus obtained for the speed command value n sent to the motor control device (MSC) ref The method comprises the steps of carrying out a first treatment on the surface of the During high-low voltage fault ride through, a reactive current command value (i) provided by the power generation system qHVRT Or i qLVRT ) Can meet the related requirements, and the reactive current instruction value (i qref ) Issued by the upper computer, the reactive current command value and i q Obtaining exciting current compensation value delta I through PI regulator f With exciting current reference value I f0 * And exciting current feedback value I f After comparison, the output of the PI regulator is obtainedModulating wave m.
Specifically, the specific logic sequence of the step 102 and the step 103 is not limited in this embodiment, for example, the step 102 may be performed before the step 103, the step 103 may be performed before the step 102, or the step 102 and the step 103 may be performed simultaneously.
Furthermore, the grid-connected control method of the synchronous power generation system provided by the embodiment may further include a pre-synchronization control process before grid connection of the synchronous power generation system and the power grid, for example, the processor may obtain, through a phase-locked loop, a power grid voltage angular frequency and a power grid voltage angle corresponding to the three-phase voltage of the power grid before grid connection of the synchronous power generation system and the power grid; acquiring a presynchronization rotating speed command value according to the power grid voltage angular frequency, the power grid voltage angle and the three-phase voltage of the generator stator; the presynchronization rotation speed command value is used for adjusting the rotation speed of the motor; and controlling the motor control device to adjust the rotating speed of the motor according to the presynchronized rotating speed command value.
Specifically, the specific manner of obtaining the pre-synchronous rotation speed command value according to the grid voltage angular frequency, the grid voltage angle and the three-phase voltage of the generator stator can be set by a designer according to a practical scene and user requirements, as shown in fig. 4, the processor can be configured according to the grid voltage angle (θ g ) Using a predetermined coordinate transformation matrix (T abc/dq ) For the three-phase voltage (U) of the generator stator abc ) Is converted to obtain the generator voltage q-axis component (U q ) The method comprises the steps of carrying out a first treatment on the surface of the Obtaining a presynchronized rotation speed compensation value (delta n) corresponding to the q-axis component of the generator voltage by using a sixth controller (PI); with a seventh comparator, the presynchronized rotational speed compensation value and the grid voltage angular frequency (ω g ) Comparing the corresponding rotating speed command reference values to obtain a presynchronization rotating speed command value (n); wherein the presynchronization rotation speed command value is the difference between a rotation speed command reference value and a presynchronization rotation speed compensation value, and the rotation speed command reference value is the product of the power grid voltage angular frequency and 1/2 pi and a preset conversion ratio (T) f/n ) Is a product of (a) and (b).
As shown in fig. 4, the pre-synchronization control procedure provided by the present embodiment may include 2 links of grid phase identification and generator tracking grid control. In FIG. 4The power grid phase discrimination link can be realized by using a digital PLL, T abc/dq Can be a preset coordinate transformation matrix, PI is a proportional integral controller, 1/s is an integral link, mod (2 PI) is a remainder link and T f/n The conversion ratio (namely, preset conversion ratio) of the network voltage angular frequency corresponding to the rated rotation speed of the generator; omega g For the angular frequency of the network voltage, θ, obtained through the PLL g The power grid voltage angle is output by phase locking; will be theta g As generator stator three-phase voltage (U) abc ) Angle of coordinate transformation, transformed generator voltage q-axis component U q The output of the PI regulator is used for obtaining a rotating speed command compensation value delta n, and the rotating speed command reference value corresponding to the network voltage angular frequency is subtracted by the compensation value delta n to obtain a presynchronized rotating speed command value (n) which is sent to motor control equipment (MSC).
Specifically, for the specific device types of the above-mentioned controllers (such as the first controller to the sixth controller), the designer may set the specific device types according to the practical scenario and the user requirement, and as shown in fig. 3 and fig. 4, the PI controller may be used as the above-mentioned controllers, and the first controller to the sixth controller may be PI controllers; other controllers such as a sliding mode controller and a model predictive controller may be used as the above-described controller, and this embodiment is not limited in any way.
For example, a new energy driving MGP experimental environment shown in fig. 2 is set up, and the power grid device adopts an ac 50Hz-690V power supply mode, as can be seen from fig. 5, the pre-synchronization control process provided by the embodiment can make the pre-synchronization effect of the generator voltage and the power grid voltage good before grid connection, and the impact on the power grid after grid connection is smaller.
Waveform diagrams of the added active and reactive control under the ac 50Hz-690V grid arrangement shown in figures 6 and 7. It can be seen that the active control power from the system increases from 0 to 550kW faster and remains stable, and that the inductive reactive control power from 265kVar increases from 295kVar faster and remains stable.
The waveforms of the network voltage and the reactive power emitted by the system during 0.8 times of low voltage fault crossing and 1.2 times of high voltage fault crossing of the alternating current 50Hz-690V power grid device are shown in the figures 8 and 9. It can be seen that after a low threading time, the network voltage drops instantaneously, and the system emits capacitive reactive power to carry out low-voltage support; after the high threading time, the network voltage rises instantaneously, and the system gives out inductive reactive power to support high voltage.
Waveform diagrams of abnormal grid frequency and waveform diagrams of grid-connected point frequency (f.times.100 processing) when load changes under the alternating-current 50Hz-690V power grid device are shown in fig. 10 to 12. In fig. 10, when the load increases, the frequency of the grid-connected point only slightly changes, and then the system returns to normal in a short time, which indicates that the system can effectively increase the frequency stability of the new energy power grid; in fig. 11 and 12, the rotation speed of the generator can quickly and accurately track the frequency of the power grid before and after the frequency of the power grid rises to 51.55Hz and falls to 46.55Hz for frequency adaptation.
In the embodiment of the invention, the frequency and voltage stability of the power system are actively supported by a grid-connected mode of the new energy through the synchronous generator pair grid connection; the stable control of the grid-connected power is realized by acquiring a rotating speed instruction value for adjusting the rotating speed of the motor and a modulation wave for adjusting the exciting current of the generator and adopting a power control mode of convenient and rapid power feedback control and direct-current voltage feedback control, so that the frequency and voltage stability of grid connection are ensured.
Corresponding to the above method embodiment, the embodiment of the present invention further provides a grid-connected control device of the synchronous power generation system, where the grid-connected control device of the synchronous power generation system described below and the grid-connected control method of the synchronous power generation system described above may be referred to correspondingly.
Referring to fig. 13, fig. 13 is a block diagram illustrating a grid-connected control device of a synchronous power generation system according to an embodiment of the present invention; the apparatus may include:
the acquisition module 10 is used for acquiring active current and reactive current corresponding to the three-phase current of the generator according to the three-phase current of the generator and the voltage angle of the power grid after the synchronous power generation system is connected with the power grid;
the active control module 20 is configured to obtain a rotation speed command value according to the active current, the intermediate dc voltage command value, and the grid voltage angular frequency; the rotating speed command value is used for adjusting the rotating speed of a motor in the synchronous power generation system;
The reactive control module 30 is configured to obtain a modulation wave according to the reactive current, the reactive current instruction value, the exciting current reference value and the exciting current feedback value; the modulation wave is used for adjusting the exciting current of a generator in the synchronous power generation system.
Alternatively, the active control module 20 may include:
the first comparison submodule is used for comparing the intermediate direct-current voltage with the intermediate direct-current voltage command value by utilizing the first comparator to obtain a direct-current voltage compensation value; the direct-current voltage compensation value is the difference between the intermediate direct-current voltage command value and the intermediate direct-current voltage;
the first control submodule is used for acquiring an active current instruction value corresponding to the direct-current voltage compensation value by using the first controller;
the second comparison submodule is used for comparing the active current with the active current instruction value by utilizing a second comparator to obtain an active current compensation value; the active current compensation value is the difference between the active current command value and the active current;
the second control submodule is used for acquiring a rotating speed compensation value corresponding to the active current compensation value by using a second controller;
the third comparison sub-module is used for comparing the rotating speed compensation value with a rotating speed command reference value corresponding to the grid voltage angular frequency by using a third comparator to obtain a rotating speed command value; the rotating speed command value is the sum of the rotating speed compensation value and the rotating speed command reference value, and the rotating speed command reference value is the product of the power grid voltage angular frequency and 1/2 pi and the preset conversion proportion.
Alternatively, both the first controller and the second controller may be proportional-integral controllers.
Alternatively, the reactive control module 30 may include:
the fourth comparison submodule is used for comparing the reactive current instruction value with reactive current by using a fourth comparator to obtain a reactive current compensation value; the reactive current compensation value is the difference between the reactive current command value and the reactive current;
the third control submodule is used for obtaining an exciting current compensation value corresponding to the reactive current compensation value by using a third controller;
the fifth comparison sub-module is used for comparing the exciting current compensation value, the exciting current reference value and the exciting current feedback value by utilizing a fifth comparator to obtain a current comparison value; the current comparison value is the difference between the exciting current reference value and the exciting current compensation value and the exciting current feedback value;
and the fourth control submodule is used for acquiring the modulation wave corresponding to the current comparison value by using the fourth controller.
Optionally, the reactive current command value is a first current command value of high voltage fault ride through, a second current command value of low voltage fault ride through, or a third current command value of normal operation.
Optionally, the apparatus may further include:
And the power grid phase identification module is used for acquiring the power grid voltage angular frequency and the power grid voltage angle corresponding to the three-phase voltage of the power grid through the phase-locked loop.
Optionally, the grid phase identification module may include:
the transformation submodule is used for transforming the three-phase voltage of the power grid by utilizing a preset coordinate transformation matrix according to the previous power grid voltage angle to obtain a power grid voltage q-axis component corresponding to the three-phase voltage of the power grid;
the fifth control submodule is used for acquiring an angular frequency compensation value corresponding to the q-axis component of the power grid voltage by using a fifth controller;
the sixth comparison submodule is used for comparing the angular frequency compensation value with the angular frequency reference value by utilizing a sixth comparator to obtain the angular frequency of the power grid voltage; wherein, the angular frequency of the power grid voltage is the sum of the angular frequency compensation value and the angular frequency reference value;
and the angle acquisition sub-module is used for integrating and taking the surplus of the voltage angular frequency of the power grid to acquire the current voltage angle of the power grid.
Optionally, the obtaining module 10 may be specifically configured to transform the three-phase current of the generator by using a preset coordinate transformation matrix according to the target angle, so as to obtain an active current and a reactive current; wherein the target angle is the difference between the grid voltage angle and pi/6.
Optionally, the apparatus may further include:
a generator transmitting module for transmitting the rotation speed command value to the motor control device to control a target inverter in the synchronous power generation system according to the rotation speed command value; wherein the target inverter is used for supplying power to the motor by using the intermediate direct-current voltage;
the generator control module is used for controlling a generator rectifier in the synchronous power generation system according to the modulation wave so as to adjust the exciting current of the generator; wherein, the generator rectifier is used for providing exciting current for the generator.
Optionally, the apparatus may further include:
the pre-synchronization power grid phase identification module is used for acquiring power grid voltage angular frequency and power grid voltage angle corresponding to three-phase voltage of the power grid through a phase-locked loop before the synchronous power generation system is connected with the power grid;
the tracking power grid control module is used for acquiring a presynchronization rotating speed instruction value according to the power grid voltage angular frequency, the power grid voltage angle and the three-phase voltage of the generator stator; the presynchronization rotation speed command value is used for adjusting the rotation speed of the motor;
and the presynchronization control module is used for controlling the motor control equipment to adjust the rotating speed of the motor according to the presynchronization rotating speed command value.
Optionally, the tracking grid control module may include:
the voltage transformation submodule is used for transforming three-phase voltage of the generator stator by utilizing a preset coordinate transformation matrix according to the voltage angle of the power grid to obtain a q-axis component of the generator voltage;
the sixth control submodule is used for acquiring a presynchronized rotating speed compensation value corresponding to the q-axis component of the generator voltage by using a sixth controller;
a seventh comparing sub-module, configured to compare the presynchronized rotation speed compensation value with a rotation speed command reference value corresponding to the grid voltage angular frequency by using a seventh comparator, so as to obtain a presynchronized rotation speed command value; the presynchronization rotating speed command value is the difference between a rotating speed command reference value and a presynchronization rotating speed compensation value, and the rotating speed command reference value is the product of the angular frequency of the power grid voltage and 1/2 pi and the preset conversion proportion.
Corresponding to the above method embodiment, the embodiment of the present invention further provides an electronic device, where an electronic device described below and a grid-connected control method of a synchronous power generation system described above may be referred to correspondingly.
An electronic device, comprising:
a memory for storing a computer program;
and the processor is used for realizing the steps of the grid-connected control method of the synchronous power generation system provided by the embodiment when executing the computer program.
The electronic device provided in this embodiment may be specifically a generator control device (such as GSC in fig. 2).
Corresponding to the above electronic device embodiments, the present invention further provides a synchronous power generation system, and a synchronous power generation system described below and an electronic device described above may be referred to correspondingly.
A synchronous power generation system, comprising: an inverter, a pair of coaxially connected synchronous generators, a generator rectifier, a generator control device and a motor control device; wherein the generator control device is an electronic device as provided by the above embodiments.
Corresponding to the above method embodiments, the embodiments of the present invention further provide a readable storage medium, where a readable storage medium described below and a grid-connected control method of a synchronous power generation system described above may be referred to correspondingly.
A readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of the grid-connected control method of the synchronous power generation system provided by the above method embodiment.
The readable storage medium may be a usb disk, a removable hard disk, a Read-only memory (ROM), a random access memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, and the like.
In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. The apparatus, the electronic device, the synchronous power generation system and the readable storage medium disclosed in the embodiments have relatively simple description, and the relevant points are referred to in the description of the method section because they correspond to the methods disclosed in the embodiments.
The synchronous power generation system, the grid-connected control method and device, the electronic equipment and the readable storage medium provided by the invention are described in detail. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (14)
1. A grid-connected control method of a synchronous power generation system is characterized by comprising the following steps:
After the synchronous power generation system is connected with a power grid, acquiring active current and reactive current corresponding to the three-phase current of the generator according to the three-phase current of the generator and the voltage angle of the power grid;
acquiring a rotating speed command value according to the active current, the intermediate direct current voltage command value and the grid voltage angular frequency; the rotating speed command value is used for adjusting the rotating speed of a motor in the synchronous power generation system; the intermediate direct-current voltage is the direct-current voltage of the new energy power generation equipment and/or the energy storage converter for supplying power to the motor;
obtaining a modulation wave according to the reactive current, the reactive current instruction value, the exciting current reference value and the exciting current feedback value; the modulation wave is used for adjusting exciting current of a generator in the synchronous power generation system, and the generator and the motor are coaxially connected synchronous generator pairs;
further comprises:
before the synchronous power generation system is connected with a power grid, acquiring power grid voltage angular frequency and power grid voltage angle corresponding to three-phase voltage of the power grid through a phase-locked loop;
acquiring a presynchronization rotating speed command value according to the grid voltage angular frequency, the grid voltage angle and the three-phase voltage of the generator stator; wherein the presynchronized rotation speed command value is used for adjusting the rotation speed of the motor;
And controlling motor control equipment to adjust the rotating speed of the motor according to the presynchronized rotating speed command value.
2. The grid-connected control method of a synchronous power generation system according to claim 1, wherein the obtaining a rotation speed command value according to the active current, the intermediate direct current voltage command value, and the grid voltage angular frequency includes:
comparing the intermediate direct-current voltage with the intermediate direct-current voltage command value by using a first comparator to obtain a direct-current voltage compensation value; the direct-current voltage compensation value is the difference between the intermediate direct-current voltage command value and the intermediate direct-current voltage;
acquiring an active current instruction value corresponding to the direct-current voltage compensation value by using a first controller;
comparing the active current with the active current command value by using a second comparator to obtain an active current compensation value; wherein the active current compensation value is the difference between the active current command value and the active current;
acquiring a rotating speed compensation value corresponding to the active current compensation value by using a second controller;
comparing the rotation speed compensation value with a rotation speed command reference value corresponding to the grid voltage angular frequency by using a third comparator to obtain the rotation speed command value; the rotating speed command value is the sum of the rotating speed compensation value and the rotating speed command reference value, and the rotating speed command reference value is the product of the grid voltage angular frequency and 1/2 pi and the preset conversion proportion.
3. The grid-connected control method of a synchronous power generation system according to claim 2, wherein the first controller and the second controller are each proportional-integral controllers.
4. The grid-connected control method of a synchronous power generation system according to claim 1, wherein the obtaining a modulation wave according to the reactive current, reactive current instruction value, exciting current reference value, and exciting current feedback value includes:
comparing the reactive current instruction value with the reactive current by using a fourth comparator to obtain a reactive current compensation value; wherein the reactive current compensation value is the difference between the reactive current command value and the reactive current;
obtaining an exciting current compensation value corresponding to the reactive current compensation value by using a third controller;
comparing the exciting current compensation value, the exciting current reference value and the exciting current feedback value by using a fifth comparator to obtain a current comparison value; wherein the current comparison value is a difference between the excitation current reference value and the excitation current compensation value and a difference between the excitation current feedback value;
and acquiring the modulation wave corresponding to the current comparison value by using a fourth controller.
5. The grid-connected control method of a synchronous power generation system according to claim 1, wherein the reactive current command value is a first current command value for high voltage fault ride through, a second current command value for low voltage fault ride through, or a third current command value for normal operation.
6. The grid-connected control method of a synchronous power generation system according to claim 1, wherein before obtaining the active current and the reactive current corresponding to the three-phase current of the generator according to the three-phase current of the generator and the voltage angle of the power grid, the method further comprises:
and acquiring the grid voltage angular frequency and the grid voltage angle corresponding to the three-phase voltage of the grid through a phase-locked loop.
7. The grid-connected control method of the synchronous power generation system according to claim 6, wherein the obtaining, by the phase-locked loop, the grid voltage angular frequency and the grid voltage angle corresponding to the grid three-phase voltage includes:
transforming the three-phase voltage of the power grid by using a preset coordinate transformation matrix according to the last power grid voltage angle to obtain a q-axis component of the power grid voltage corresponding to the three-phase voltage of the power grid;
obtaining an angular frequency compensation value corresponding to the q-axis component of the power grid voltage by using a fifth controller;
Comparing the angular frequency compensation value with an angular frequency reference value by using a sixth comparator to obtain the grid voltage angular frequency; wherein the grid voltage angular frequency is the sum of the angular frequency compensation value and the angular frequency reference value;
and integrating and taking the margin of the grid voltage angular frequency to obtain the current grid voltage angle.
8. The grid-connected control method of a synchronous power generation system according to claim 1, wherein the obtaining the active current and the reactive current corresponding to the three-phase current of the generator according to the three-phase current of the generator and the voltage angle of the power grid comprises:
transforming the three-phase current of the generator by using a preset coordinate transformation matrix according to a target angle to obtain the active current and the reactive current; wherein the target angle is the difference between the grid voltage angle and pi/6.
9. The grid-tie control method of a synchronous power generation system according to claim 1, further comprising:
the generator control device sends the rotating speed command value to the motor control device so as to control the motor control device to control a target inverter in the synchronous power generation system according to the rotating speed command value; wherein the target inverter is configured to power the motor with the intermediate dc voltage;
Controlling a generator rectifier in the synchronous power generation system according to the modulation wave so as to adjust exciting current of the generator; wherein the generator rectifier is configured to provide excitation current for the generator.
10. The grid-connected control method of a synchronous power generation system according to claim 1, wherein the obtaining a pre-synchronization rotation speed command value according to the grid voltage angular frequency, the grid voltage angle and the generator stator three-phase voltage includes:
according to the power grid voltage angle, transforming the three-phase voltage of the generator stator by using a preset coordinate transformation matrix to obtain a generator voltage q-axis component;
obtaining a presynchronization rotation speed compensation value corresponding to the generator voltage q-axis component by using a sixth controller;
comparing the presynchronization rotation speed compensation value with a rotation speed command reference value corresponding to the grid voltage angular frequency by using a seventh comparator to obtain the presynchronization rotation speed command value; the presynchronization rotating speed command value is the difference between the rotating speed command reference value and the presynchronization rotating speed compensation value, and the rotating speed command reference value is the product of the power grid voltage angular frequency and 1/2 pi and the product of the preset conversion proportion.
11. A grid-connected control device of a synchronous power generation system, comprising:
the acquisition module is used for acquiring active current and reactive current corresponding to the three-phase current of the generator according to the three-phase current of the generator and the voltage angle of the power grid after the synchronous power generation system is connected with the power grid;
the active control module is used for acquiring a rotating speed command value according to the active current, the intermediate direct current voltage command value and the grid voltage angular frequency; the rotating speed command value is used for adjusting the rotating speed of a motor in the synchronous power generation system;
the reactive power control module is used for obtaining modulation waves according to the reactive current, the reactive current instruction value, the exciting current reference value and the exciting current feedback value; the modulation wave is used for adjusting the exciting current of a generator in the synchronous power generation system;
further comprises:
the pre-synchronization power grid phase identification module is used for acquiring power grid voltage angular frequency and power grid voltage angle corresponding to three-phase voltage of the power grid through a phase-locked loop before the synchronous power generation system is connected with the power grid;
the tracking power grid control module is used for acquiring a presynchronization rotating speed instruction value according to the power grid voltage angular frequency, the power grid voltage angle and the three-phase voltage of the generator stator; wherein the presynchronized rotation speed command value is used for adjusting the rotation speed of the motor;
And the presynchronization control module is used for controlling the motor control equipment to adjust the rotating speed of the motor according to the presynchronization rotating speed command value.
12. An electronic device, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the grid-tie control method of the synchronous power generation system according to any one of claims 1 to 10 when executing the computer program.
13. A synchronous power generation system, comprising: an inverter, a pair of coaxially connected synchronous generators, a generator rectifier, a generator control device and a motor control device; wherein the generator control device is the electronic device of claim 12.
14. A readable storage medium, characterized in that the readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the grid-tie control method of a synchronous power generation system as claimed in any one of claims 1 to 10.
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