CN109995049B - A fault ride-through control method and related device for a variable frequency transformer - Google Patents
A fault ride-through control method and related device for a variable frequency transformer Download PDFInfo
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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
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
本申请公开了一种可变频率变压器的故障穿越控制方法，首先获取第一电网电压、第二电网电压、定子电压以及定子电流，然后其预处理后计算出单个串联三相变换器对应的电压参考值，最后转换出控制信号，以便对串联三相变换器进行控制，可以抑制由第一电网负序电压引起的定子负序电压和定子负序电流，消除两倍转子电角速度、两倍定子同步速度的转矩和功率波动，还可以抑制由第二电网负序电压引起的定子负序电流，大幅降低两倍转子同步速度的电磁转矩和功率波动，也就是用单个串联三相变换器同时解决了左侧电网和右侧电网的电压不平衡问题，降低电网成本。本申请还公开了一种故障穿越控制装置、电路控制器以及计算机可读存储介质，具有以上有益效果。
The present application discloses a fault ride-through control method for a variable frequency transformer. First, the first grid voltage, the second grid voltage, the stator voltage and the stator current are obtained, and then the voltage corresponding to a single series-connected three-phase converter is calculated after preprocessing. reference value, and finally convert the control signal to control the series three-phase converter, which can suppress the stator negative sequence voltage and stator negative sequence current caused by the negative sequence voltage of the first grid, and eliminate twice the rotor electrical angular velocity and twice the stator The torque and power fluctuation of the synchronous speed can also suppress the stator negative sequence current caused by the negative sequence voltage of the second grid, and greatly reduce the electromagnetic torque and power fluctuation of the rotor synchronous speed twice, that is, use a single series three-phase converter. At the same time, the problem of voltage imbalance between the left power grid and the right power grid is solved, and the cost of the power grid is reduced. The present application also discloses a fault ride-through control device, a circuit controller and a computer-readable storage medium, which have the above beneficial effects.
Description
Technical Field
The present invention relates to the field of asynchronous interconnection technology of power grids, and in particular, to a fault ride-through control method, a fault ride-through control device, a circuit controller, and a computer-readable storage medium for a variable frequency transformer.
Background
With the continuous development of energy internet, power grids with different frequencies can realize electric energy sharing in a power grid asynchronous interconnection mode. The variable frequency transformer is particularly suitable for the asynchronous interconnection of close-range face-to-face power grids. The variable frequency transformer has the following advantages: 1) the inherent rotational inertia of the rotor may provide a stronger natural damping characteristic to dampen oscillations of the power system; 2) the overload capacity is stronger; 3) the slower dynamic characteristics reduce interaction with neighboring devices.
When the three-phase voltage unbalance fault occurs to any side of the power grid of the variable frequency transformer, the three-phase unbalance is caused by the current flowing through the variable frequency transformer, and the electromagnetic torque, active power and reactive power of the variable frequency transformer generate the fluctuation of twice the power grid frequency due to the interaction between the three-phase unbalance voltage and the three-phase unbalance current, so that the service life of mechanical equipment and the stable operation of the power grid are influenced.
In the prior art, reactive power control is generally performed on a variable frequency transformer by connecting three-phase converters in series, so that three-phase imbalance of the variable frequency transformer is eliminated. Another prior art is to use two three-phase converters connected in series to control the voltage imbalance on the left and right sides. However, the first prior art does not consider how to suppress the torque and power fluctuations caused by the grid voltage imbalance, and therefore, the fault ride-through operation of the variable frequency transformer cannot be realized. Another prior art method for achieving fault-ride-through operation can be summarized as "using the left converter to solve the problem of imbalance on the left side and using the right converter to solve the problem of imbalance on the right side", so that 2 series three-phase converters are needed to achieve fault ride-through, resulting in an excessive cost of the fault-ride-through circuit.
Therefore, how to reduce the cost while solving the voltage imbalance of the two-side power grid is a key issue of attention of those skilled in the art.
Disclosure of Invention
The purpose of the application is to provide a fault ride-through control method, a fault ride-through control device, a circuit controller and a computer readable storage medium for a variable frequency transformer, which solve the problem of unbalanced power grids on two sides through a series three-phase converter on one side and reduce the circuit cost.
In order to solve the above technical problem, the present application provides a fault ride-through control method for a variable frequency transformer, including:
preprocessing the collected first power grid voltage, second power grid voltage, stator current and rotor phase angle to obtain a first power grid positive sequence voltage direct-current component, a stator positive sequence current direct-current component, a stator negative sequence voltage direct-current component and a stator negative sequence current direct-current component;
performing reference voltage calculation on the first power grid positive sequence voltage direct-current component, the stator positive sequence current direct-current component, the stator negative sequence voltage direct-current component and the stator negative sequence current component to obtain a positive sequence voltage reference value, a first negative sequence voltage reference value and a second negative sequence voltage reference value of the series three-phase converter;
and performing control signal conversion on the positive sequence voltage reference value, the first negative sequence voltage reference value and the second negative sequence voltage reference value according to the rotor phase angle to obtain a first control signal, a second control signal and a third control signal of the series three-phase converter, so as to control the series three-phase converter according to the first control signal, the second control signal and the third control signal.
Optionally, the collected first grid voltage, second grid voltage, stator current, and rotor phase angle are preprocessed to obtain a first grid positive sequence voltage dc component, a stator positive sequence current dc component, a stator negative sequence voltage dc component, and a stator negative sequence current dc component, including:
collecting the first grid voltage, the second grid voltage and the stator voltage by using a voltage sensor, collecting the stator current by using a current sensor, and collecting the rotor phase angle by using an encoder;
respectively carrying out three-phase static to two-phase static coordinate conversion processing on the first power grid voltage, the second power grid voltage, the stator voltage and the stator current to obtain a first power grid voltage vector, a second power grid voltage vector, a stator voltage vector and a stator current vector under a two-phase static coordinate system;
respectively carrying out positive and negative sequence separation calculation processing on the first power grid voltage vector, the second power grid voltage vector, the stator voltage vector and the stator current vector to obtain a first power grid positive sequence voltage vector, a first power grid negative sequence voltage vector, a second power grid negative sequence voltage vector, a stator positive sequence voltage vector, a stator negative sequence voltage vector, a stator positive sequence current vector and a stator negative sequence current vector under a two-phase static coordinate system;
respectively carrying out phase angle calculation processing on the first power grid positive sequence voltage vector, the first power grid negative sequence voltage vector and the second power grid negative sequence voltage vector to obtain a first power grid positive sequence voltage phase, a first power grid negative sequence voltage phase and a second power grid negative sequence voltage phase;
and respectively carrying out conversion processing from two phases to two phases of static rotation coordinates on the first power grid positive sequence voltage vector, the stator negative sequence voltage vector, the stator positive sequence current vector and the stator negative sequence current vector according to the rotor phase angle, the first power grid positive sequence voltage phase, the first power grid negative sequence voltage phase and the second power grid negative sequence voltage phase to obtain the first power grid positive sequence voltage direct current component, the stator positive sequence voltage direct current component and the stator positive sequence current direct current component under a stator positive sequence synchronous rotation coordinate system, obtain the stator negative sequence voltage direct current component under the stator negative sequence synchronous rotation coordinate system and obtain the stator negative sequence current direct current component under the rotor negative sequence synchronous rotation coordinate system.
Optionally, performing reference voltage calculation on the first grid positive sequence voltage direct-current component, the stator positive sequence current direct-current component, the stator negative sequence voltage direct-current component, and the stator negative sequence current component to obtain a positive sequence voltage reference value, a first negative sequence voltage reference value, and a second negative sequence voltage reference value of the series three-phase converter, including:
calculating the positive sequence voltage direct-current component, the stator negative sequence voltage direct-current component, the stator positive sequence current direct-current component and the stator negative sequence current component of the first power grid according to a preset voltage control equation to obtain the positive sequence voltage reference value, the first negative sequence voltage reference value and the second negative sequence voltage reference value of the series three-phase converter;
wherein the preset voltage control equation comprises:
wherein, Kp6And Ki6Are series three-phase converters d (+ ω), respectivelys) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp7And Ki7Are respectively series three-phase converters q (+ ω [) ands) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp8And Ki8Are respectively series three-phase converters d (-omega)s) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp9And Ki9Are respectively a series three-phase converter q (-omega)s) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp10And Ki10Are series three-phase converters d (+ ω), respectivelyrm-ωr) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp11And Ki11Are respectively series three-phase converters q (+ ω [) andrm-ωr) Proportional and integral coefficients of the shaft voltage PI regulator.
Optionally, performing control signal conversion on the positive sequence voltage reference value, the first negative sequence voltage reference value, and the second negative sequence voltage reference value according to the rotor phase angle to obtain a first control signal, a second control signal, and a third control signal of the series three-phase converter, so as to control the series three-phase converter according to the first control signal, the second control signal, and the third control signal, and the method includes:
respectively carrying out two-phase rotation to two-phase stationary coordinate conversion processing on the direct-current component of the positive sequence voltage reference value, the direct-current component of the first negative sequence voltage reference value and the direct-current component of the second negative sequence voltage reference value to obtain a positive sequence voltage reference value, a first negative sequence voltage reference value and a second negative sequence voltage reference value of the series three-phase converter under a two-phase stationary coordinate system;
adding the positive sequence voltage reference value, the first negative sequence voltage reference value and the second negative sequence voltage reference value to obtain a voltage reference value of the series three-phase converter under a two-phase static coordinate system;
and performing space vector modulation on the voltage reference value to obtain the first control signal, the second control signal and the third control signal of the series three-phase converter, so as to control the series three-phase converter according to the first control signal, the second control signal and the third control signal.
The present application further provides a fault ride-through control apparatus for a variable frequency transformer, comprising:
the preprocessing module is used for preprocessing the collected first power grid voltage, the collected second power grid voltage, the collected stator current and the collected rotor phase angle to obtain a first power grid positive sequence voltage direct-current component, a first stator positive sequence current direct-current component, a first stator negative sequence voltage direct-current component and a first stator negative sequence current direct-current component;
the reference voltage calculation module is used for performing reference voltage calculation on the first power grid positive sequence voltage direct-current component, the stator positive sequence current direct-current component, the stator negative sequence voltage direct-current component and the stator negative sequence current component to obtain a positive sequence voltage reference value, a first negative sequence voltage reference value and a second negative sequence voltage reference value of the series three-phase converter;
and the control signal conversion module is used for performing control signal conversion on the positive sequence voltage reference value, the first negative sequence voltage reference value and the second negative sequence voltage reference value according to the rotor phase angle to obtain a first control signal, a second control signal and a third control signal of the series three-phase converter, so that the series three-phase converter is controlled according to the first control signal, the second control signal and the third control signal.
Optionally, the preprocessing module includes:
the signal acquisition unit is used for acquiring the first power grid voltage, the second power grid voltage and the stator voltage by using a voltage sensor, acquiring the stator current by using a current sensor and acquiring the rotor phase angle by using an encoder;
the first two-phase static coordinate transformation unit is used for respectively carrying out three-phase static to two-phase static coordinate transformation processing on the first power grid voltage, the second power grid voltage, the stator voltage and the stator current to obtain a first power grid voltage vector, a second power grid voltage vector, a stator voltage vector and a stator current vector under a two-phase static coordinate system;
the positive and negative sequence separation unit is used for respectively carrying out positive and negative sequence separation calculation processing on the first power grid voltage vector, the second power grid voltage vector, the stator voltage vector and the stator current vector to obtain a first power grid positive sequence voltage vector, a first power grid negative sequence voltage vector, a second power grid negative sequence voltage vector, a stator positive sequence voltage vector, a stator negative sequence voltage vector, a stator positive sequence current vector and a stator negative sequence current vector under a two-phase static coordinate system;
the phase angle calculation unit is used for performing phase angle calculation processing on the first power grid positive sequence voltage vector, the first power grid negative sequence voltage vector and the second power grid negative sequence voltage vector respectively to obtain a first power grid positive sequence voltage phase, a first power grid negative sequence voltage phase and a second power grid negative sequence voltage phase;
and the two-phase rotating coordinate transformation unit is used for respectively carrying out two-phase static-to-two-phase rotating coordinate transformation processing on the first power grid positive sequence voltage vector, the stator negative sequence voltage vector, the stator positive sequence current vector and the stator negative sequence current vector according to the rotor phase angle, the first power grid positive sequence voltage phase, the first power grid negative sequence voltage phase and the second power grid negative sequence voltage phase to obtain the first power grid positive sequence voltage direct current component, the stator positive sequence voltage direct current component and the stator positive sequence current direct current component under the stator positive sequence synchronous rotating coordinate system, obtain the stator negative sequence voltage direct current component under the stator negative sequence synchronous rotating coordinate system, and obtain the stator negative sequence current direct current component under the rotor negative sequence synchronous rotating coordinate system.
Optionally, the reference voltage calculation module is specifically configured to calculate a positive sequence voltage direct-current component of the first power grid, a positive sequence voltage direct-current component of the stator, a negative sequence voltage direct-current component of the stator, a positive sequence current direct-current component of the stator, and a negative sequence current component of the stator according to a preset voltage control equation, so as to obtain the positive sequence voltage reference value, the first negative sequence voltage reference value, and the second negative sequence voltage reference value of the series three-phase converter;
wherein the preset voltage control equation comprises:
wherein, Kp6And Ki6Are series three-phase converters d (+ ω), respectivelys) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp7And Ki7Are respectively series three-phase converters q (+ ω [) ands) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp8And Ki8Are respectively series three-phase converters d (-omega)s) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp9And Ki9Are respectively a series three-phase converter q (-omega)s) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp10And Ki10Are series three-phase converters d (+ ω), respectivelyrm-ωr) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp11And Ki11Are respectively series three-phase converters q (+ ω [) andrm-ωr) Proportional and integral coefficients of the shaft voltage PI regulator.
Optionally, the control signal conversion module includes:
the second two-phase static coordinate transformation unit is used for respectively carrying out two-phase rotation to two-phase static coordinate transformation processing on the direct-current component of the positive sequence voltage reference value, the direct-current component of the first negative sequence voltage reference value and the direct-current component of the second negative sequence voltage reference value to obtain the positive sequence voltage reference value, the first negative sequence voltage reference value and the second negative sequence voltage reference value of the series three-phase converter under a two-phase static coordinate system;
a voltage reference value obtaining unit, configured to add the positive sequence voltage reference value, the first negative sequence voltage reference value, and the second negative sequence voltage reference value to obtain a voltage reference value of the series three-phase converter in a two-phase static coordinate system;
and the space vector modulation unit is used for carrying out space vector modulation on the voltage reference value to obtain the first control signal, the second control signal and the third control signal of the series three-phase converter, so that the series three-phase converter is controlled according to the first control signal, the second control signal and the third control signal.
The present application further provides a circuit controller, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the fault-ride-through control method as described above when executing the computer program.
The present application also provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the fault-ride-through control method as described above.
The application provides a fault ride-through control method of a variable frequency transformer, which comprises the following steps: preprocessing the collected first power grid voltage, second power grid voltage, stator current and rotor phase angle to obtain a first power grid positive sequence voltage direct-current component, a stator positive sequence current direct-current component, a stator negative sequence voltage direct-current component and a stator negative sequence current direct-current component; performing reference voltage calculation on the first power grid positive sequence voltage direct-current component, the stator positive sequence current direct-current component, the stator negative sequence voltage direct-current component and the stator negative sequence current component to obtain a positive sequence voltage reference value, a first negative sequence voltage reference value and a second negative sequence voltage reference value of the series three-phase converter; and performing control signal conversion on the positive sequence voltage reference value, the first negative sequence voltage reference value and the second negative sequence voltage reference value according to the rotor phase angle to obtain a first control signal, a second control signal and a third control signal of the series three-phase converter, so as to control the series three-phase converter according to the first control signal, the second control signal and the third control signal.
By obtaining the voltage of a first power grid, the voltage of a second power grid, the voltage of a stator and the current of the stator, calculating the reference value of the positive sequence voltage, the reference value of the first negative sequence voltage and the reference value of the second negative sequence voltage of a single series three-phase converter after preprocessing the voltage of the first power grid, and finally converting a control signal to control the series three-phase converter, the method can inhibit the negative sequence voltage of the stator and the negative sequence current of the stator caused by the negative sequence voltage of the first power grid, eliminate the torque and power fluctuation of double rotor electrical angular speed and double stator synchronous speed, inhibit the negative sequence current of the stator caused by the negative sequence voltage of the second power grid, greatly reduce the electromagnetic torque and power fluctuation of double rotor synchronous speed, namely simultaneously solve the problem of voltage unbalance of a left power grid and a right power grid by using the single series three-phase converter, and maintain the control capability of reactive power, and the cost of the power grid is reduced.
The present application further provides a fault ride-through control device of a variable frequency transformer, a circuit controller and a computer readable storage medium, which have the above beneficial effects and are not described herein again.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a fault ride-through control method for a variable frequency transformer according to an embodiment of the present disclosure;
fig. 2 is a control block diagram of another fault ride-through control method for a variable frequency transformer according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a reactive power control circuit of a variable frequency transformer according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a fault ride-through control device of a variable frequency transformer according to an embodiment of the present disclosure.
Detailed Description
The core of the application is to provide a fault ride-through control method, a fault ride-through control device, a circuit controller and a computer readable storage medium for the variable frequency transformer, and the problem of unbalance of power grids on two sides is solved through a series three-phase converter on one side, so that the circuit cost is reduced.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the prior art, reactive power control is generally performed on a variable frequency transformer by connecting three-phase converters in series, so that three-phase imbalance of the variable frequency transformer is eliminated. Another prior art is to use two three-phase converters connected in series to control the voltage imbalance on the left and right sides. However, the first prior art does not consider how to suppress the torque and power fluctuations caused by the grid voltage imbalance, and therefore, the fault ride-through operation of the variable frequency transformer cannot be realized. Another prior art method for achieving fault-ride-through operation can be summarized as "using the left converter to solve the problem of imbalance on the left side and using the right converter to solve the problem of imbalance on the right side", so that 2 series three-phase converters are needed to achieve fault ride-through, resulting in an excessive cost of the fault-ride-through circuit.
Therefore, the application provides a fault ride-through control method of a variable frequency transformer, which comprises the steps of obtaining a first power grid voltage, a second power grid voltage, a stator voltage and a stator current, preprocessing the first power grid voltage, the second power grid voltage and the stator current, calculating a positive sequence voltage reference value, a first negative sequence voltage reference value and a second negative sequence voltage reference value of a single series three-phase converter, and finally converting a control signal to control the series three-phase converter, so that the negative sequence voltage and the negative sequence current of the stator caused by the negative sequence voltage of the first power grid can be inhibited, the torque and power fluctuation of twice the rotor electrical angular velocity and twice the stator synchronous velocity can be eliminated, the negative sequence current of the stator caused by the negative sequence voltage of the second power grid can be inhibited, the electromagnetic torque and power fluctuation of twice the rotor synchronous velocity can be greatly reduced, namely, the problem of voltage imbalance of a left side power grid and a right side power grid can be simultaneously solved, and the control capability of the reactive power is maintained, and the cost of the power grid is reduced.
Referring to fig. 1, fig. 1 is a flowchart illustrating a fault ride-through control method for a variable frequency transformer according to an embodiment of the present disclosure.
In this embodiment, the method may include:
s101, preprocessing the collected first power grid voltage, second power grid voltage, stator current and rotor phase angle to obtain a first power grid positive sequence voltage direct-current component, a stator positive sequence current direct-current component, a stator negative sequence voltage direct-current component and a stator negative sequence current direct-current component;
the method mainly comprises the step of preprocessing voltage signals of power grids on two sides and voltage and current signals of a stator to obtain processed direct current components.
Generally, in a control method of a series three-phase converter in the prior art, only a state signal of one side of a power grid is acquired, so that only a control signal of one side of the power grid can be acquired after processing, and only voltage imbalance of one side can be solved.
S102, performing reference voltage calculation on the positive sequence voltage direct-current component, the stator positive sequence current direct-current component, the stator negative sequence voltage direct-current component and the stator negative sequence current component of the first power grid to obtain a positive sequence voltage reference value, a first negative sequence voltage reference value and a second negative sequence voltage reference value of the series three-phase converter;
on the basis of the previous step, the present step aims to calculate the voltage reference value, and then the control signal can be converted for control.
Specifically, in this step, reference voltage calculation may be performed according to a preset proportionality coefficient and an integral coefficient to obtain each voltage reference value.
And S103, performing control signal conversion on the positive sequence voltage reference value, the first negative sequence voltage reference value and the second negative sequence voltage reference value according to the rotor phase angle to obtain a first control signal, a second control signal and a third control signal of the series three-phase converter, so as to control the series three-phase converter according to the first control signal, the second control signal and the third control signal.
On the basis of the previous step, this step is intended to perform control signal conversion so as to obtain a control signal for controlling the series three-phase converter.
In summary, in this embodiment, by obtaining the first grid voltage, the second grid voltage, the stator voltage and the stator current, calculating the positive sequence voltage reference value, the first negative sequence voltage reference value and the second negative sequence voltage reference value of the single series three-phase converter after preprocessing the first grid voltage, and finally converting the control signals to control the series three-phase converter, the negative sequence voltage and the negative sequence current of the stator caused by the negative sequence voltage of the first grid can be suppressed, the torque and power fluctuation of twice the rotor electrical angular velocity and twice the stator synchronous velocity can be eliminated, the negative sequence current of the stator caused by the negative sequence voltage of the second grid can be suppressed, the electromagnetic torque and power fluctuation of twice the rotor synchronous velocity can be greatly reduced, that is, the problem of voltage imbalance between the left side grid and the right side grid can be simultaneously solved by using the single series three-phase converter, and the control capability of the reactive power can be maintained, and the cost of the power grid is reduced.
On the basis of the previous embodiment, the present embodiment is described with respect to a specific execution manner in each step, other portions are substantially the same as those of the previous embodiment, and the same portions may refer to the previous embodiment, which is not described herein again.
Referring to fig. 2, fig. 2 is a control block diagram of another fault ride-through control method for a variable frequency transformer according to an embodiment of the present disclosure.
In this embodiment, the method may include:
s201, collecting first power grid voltage u by using a voltage sensorg1abcA second grid voltage ug2abcAnd stator voltage usabc(ii) a Stator current i is collected by using current sensorsabc(ii) a Rotor phase angle theta acquisition by using encoderrm；
S202, aiming at the first grid voltage ug1abcA second grid voltage ug2abcStator voltage usabcAnd stator current isabcRespectively carrying out conversion processing from three-phase static coordinates to two-phase static coordinates to obtain a first power grid voltage vector u under a two-phase static coordinate systemg1αβSecond grid voltage vector ug2αβStator voltage vector usαβAnd stator current vector isαβ；
S203, aiming at the first grid voltage vector ug1αβSecond grid voltage vector ug2αβStator voltage vector usαβAnd stator current vector isαβRespectively carrying out positive and negative sequence separation calculation processing to obtain a first power grid positive sequence voltage vector u under a two-phase static coordinate systemg1αβ+First grid negative sequence voltage vector ug1αβ-Negative sequence voltage vector u of the second power gridg2αβ-Stator positive sequence voltage vector usαβ+Stator negative sequence voltage vector usαβ-Stator positive sequence current vector isαβ+And stator negative sequence current vector isαβ-；
S204, carrying out positive sequence voltage vector u on the first power gridg1αβ+First grid negative sequence voltage vector ug1αβ-And a second grid negative sequence voltage vector ug2αβ-Respectively carrying out phase angle calculation processing to obtain a positive sequence voltage phase theta of the first power gridg1+The negative sequence voltage phase theta of the first power gridg1-And a second grid negative sequence voltage phase thetag2-；
S205, according to the rotor phase angle thetarmThe positive sequence voltage phase theta of the first power gridg1+The negative sequence voltage phase theta of the first power gridg1-And a second grid negative sequence voltage phase thetag2-For positive sequence voltage vector u of first power gridg1αβ+Stator positive sequence voltage vector usαβ+Stator negative sequence voltage vector usαβ-Stator positive sequence current vector isαβ+And stator negative sequence current vector isαβ-Respectively carrying out conversion processing from two-phase static to two-phase rotating coordinates to obtain a stator positive sequence synchronous rotating coordinate system dq (+ omega)s) First grid positive sequence voltage direct current component
Stator positive sequence voltage DC component
And stator positive sequence current DC component
Obtaining a stator negative sequence synchronous rotation coordinate system dq (-omega)s) Negative sequence voltage DC component of lower stator
Obtaining a negative sequence synchronous rotation coordinate system dq (+ omega) of the rotorrm-ωr) Negative sequence DC component of lower stator
S206, according to the preset voltage control equation, carrying out positive sequence voltage direct-current component on the first power grid
Stator positive sequence voltage DC component
Negative sequence voltage DC component of stator
Stator positive sequence current DC component
And stator negative-sequence current component
Calculating to obtain the series connection IIIPositive sequence voltage reference value of phase-change converter
First negative sequence voltage reference value
And a second negative sequence voltage reference value
Wherein, the preset voltage control equation comprises:
wherein, Kp6And Ki6Are series three-phase converters d (+ ω), respectivelys) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp7And Ki7Are respectively series three-phase converters q (+ ω [) ands) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp8And Ki8Are respectively series three-phase converters d (-omega)s) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp9And Ki9Are respectively a series three-phase converter q (-omega)s) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp10And Ki10Are series three-phase converters d (+ ω), respectivelyrm-ωr) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp11And Ki11Are respectively series three-phase converters q (+ ω [) andrm-ωr) Proportional and integral coefficients of the shaft voltage PI regulator.
S207, aligning the sequential voltage reference value
Direct current component of
First negative sequence voltage reference value
Direct current component of
And a second negative sequence voltage reference value
Direct current component of
Respectively carrying out conversion processing from two-phase rotation to two-phase static coordinates to obtain a positive sequence voltage reference value of a series three-phase converter under a two-phase static coordinate system
First negative sequence voltage reference value
And a second negative sequence voltage reference value
S208, referring the positive sequence voltage
First negative sequence voltage reference value
And a second negative sequence voltage reference value
Adding to obtain the voltage reference value of the series three-phase converter under the two-phase static coordinate system
S209, for the voltage reference value
Space vector modulation is carried out to obtain a first control signal S of the series three-phase converter1A second control signal S2And a third control signal S3So as to be dependent on the first control signal S1A second control signal S2And a third control signal S3And controlling the series three-phase converter.
In addition, the above steps can also be explained with reference to fig. 2. Correspondingly, the part of the controller 1 labeled in fig. 2 is used for adjusting the reactive power, the part of the controller 2 is used for solving the problem of the first grid imbalance, and the part of the controller 3 is used for solving the problem of the second grid imbalance. For a specific control process of each controller, please refer to the contents of S201 to S209 and the contents shown in fig. 2, which are not described herein again.
It can be seen that, in the embodiment, by obtaining the first grid voltage, the second grid voltage, the stator voltage and the stator current, calculating the positive sequence voltage reference value, the first negative sequence voltage reference value and the second negative sequence voltage reference value of the single series three-phase converter after preprocessing the first grid voltage, and finally converting the control signals to control the series three-phase converter, the stator negative sequence voltage and the stator negative sequence current caused by the negative sequence voltage of the first grid can be suppressed, the torque and power fluctuation of twice the rotor electrical angular velocity and twice the stator synchronous velocity can be eliminated, the stator negative sequence current caused by the negative sequence voltage of the second grid can be suppressed, the electromagnetic torque and power fluctuation of twice the rotor synchronous velocity can be greatly reduced, that is, the problem of voltage imbalance of the left side grid and the right side grid can be simultaneously solved by using the single series three-phase converter, and the control capability of the reactive power can be maintained, and the cost of the power grid is reduced.
The embodiment provides a variable frequency transformer reactive power control circuit, which only has one series three-phase converter, and reduces the cost of a power grid. When the control methods provided by all the above embodiments can be applied, the voltage unbalance state of the power grids on two sides can be solved, and the reactive power control of the power grids is maintained.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a reactive power control circuit of a variable frequency transformer according to an embodiment of the present disclosure.
In this embodiment, the connection structure of the circuit is as follows:
the first power grid is connected with one end of the alternating current output end of the series compensation transformer;
the first power grid is connected with the alternating current end of the parallel three-phase converter through the filter inductor;
the direct current end of the parallel three-phase converter is connected with the direct current end of the series three-phase converter and the direct current input end of the H-bridge converter;
the other end of the alternating current output end of the series three-phase transformer is connected with a stator winding of the variable frequency transformer;
the AC end of the series three-phase converter is connected in series with the AC input end of the series three-phase transformer;
the control signal input end of the series three-phase converter is connected with the control circuit;
the direct current output end of the H-bridge converter is connected with a direct current motor of the variable frequency transformer;
the second network is connected to the rotor winding of the variable frequency transformer.
It can be seen that, when the control circuit connected to the three-phase converter in series is used to execute the control method provided in the above embodiment, the circuit has only one three-phase converter in series, and the control circuit connected to the three-phase converter in series obtains the first grid voltage, the second grid voltage, the stator voltage and the stator current, pre-processes them, calculates the positive sequence voltage reference value, the first negative sequence voltage reference value and the second negative sequence voltage reference value of the single three-phase converter in series, and finally converts the control signals to control the three-phase converter in series, so as to suppress the negative sequence voltage and the negative sequence current of the stator caused by the negative sequence voltage of the first grid, eliminate the torque and power fluctuation of twice the rotor angular velocity and twice the stator synchronous velocity, suppress the negative sequence current of the stator caused by the negative sequence voltage of the second grid, and greatly reduce the electromagnetic torque and power fluctuation of twice the rotor synchronous velocity, namely, the problem of voltage unbalance of the left side power grid and the right side power grid is solved by using a single series three-phase converter, the control capability of reactive power is maintained, and the cost of the power grid is reduced.
In the following, a fault ride-through control device of a variable frequency transformer provided by an embodiment of the present application is described, and a fault ride-through control device of a variable frequency transformer described below and a fault ride-through control method of a variable frequency transformer described above may be referred to correspondingly.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a fault ride-through control device of a variable frequency transformer according to an embodiment of the present disclosure.
In this embodiment, the apparatus may include:
the preprocessing module 100 is configured to preprocess the collected first grid voltage, second grid voltage, stator current, and rotor phase angle to obtain a first grid positive sequence voltage direct-current component, a stator positive sequence current direct-current component, a stator negative sequence voltage direct-current component, and a stator negative sequence current direct-current component;
a reference voltage calculation module 200, configured to perform reference voltage calculation on the first grid positive sequence voltage direct-current component, the stator positive sequence current direct-current component, the stator negative sequence voltage direct-current component, and the stator negative sequence current component to obtain a positive sequence voltage reference value, a first negative sequence voltage reference value, and a second negative sequence voltage reference value of the series three-phase converter;
the control signal conversion module 300 is configured to perform control signal conversion on the positive sequence voltage reference value, the first negative sequence voltage reference value, and the second negative sequence voltage reference value according to the rotor phase angle to obtain a first control signal, a second control signal, and a third control signal of the series three-phase converter, so as to control the series three-phase converter according to the first control signal, the second control signal, and the third control signal.
Optionally, the preprocessing module 100 may include:
the signal acquisition unit is used for acquiring a first power grid voltage, a second power grid voltage and a stator voltage by using the voltage sensor, acquiring a stator current by using the current sensor and acquiring a rotor phase angle by using the encoder;
the first two-phase static coordinate transformation unit is used for respectively carrying out three-phase static to two-phase static coordinate transformation processing on the first power grid voltage, the second power grid voltage, the stator voltage and the stator current to obtain a first power grid voltage vector, a second power grid voltage vector, a stator voltage vector and a stator current vector under a two-phase static coordinate system;
the positive and negative sequence separation unit is used for respectively carrying out positive and negative sequence separation calculation processing on the first power grid voltage vector, the second power grid voltage vector, the stator voltage vector and the stator current vector to obtain a first power grid positive sequence voltage vector, a first power grid negative sequence voltage vector, a second power grid negative sequence voltage vector, a stator positive sequence voltage vector, a stator negative sequence voltage vector, a stator positive sequence current vector and a stator negative sequence current vector under a two-phase static coordinate system;
the phase angle calculation unit is used for performing phase angle calculation processing on the first power grid positive sequence voltage vector, the first power grid negative sequence voltage vector and the second power grid negative sequence voltage vector respectively to obtain a first power grid positive sequence voltage phase, a first power grid negative sequence voltage phase and a second power grid negative sequence voltage phase;
and the two-phase rotating coordinate transformation unit is used for respectively carrying out two-phase static-to-two-phase rotating coordinate transformation processing on the first power grid positive sequence voltage vector, the stator negative sequence voltage vector, the stator positive sequence current vector and the stator negative sequence current vector according to the rotor phase angle, the first power grid positive sequence voltage phase, the first power grid negative sequence voltage phase and the second power grid negative sequence voltage phase to obtain a first power grid positive sequence voltage direct current component, a stator positive sequence voltage direct current component and a stator positive sequence current direct current component under the stator positive sequence synchronous rotating coordinate system, obtain a stator negative sequence voltage direct current component under the stator negative sequence synchronous rotating coordinate system and obtain a stator negative sequence current direct current component under the rotor negative sequence synchronous rotating coordinate system.
Optionally, the reference voltage calculation module 200 is specifically configured to calculate a positive sequence voltage direct-current component, a stator negative sequence voltage direct-current component, a stator positive sequence current direct-current component, and a stator negative sequence current component of the first power grid according to a preset voltage control equation, so as to obtain a positive sequence voltage reference value, a first negative sequence voltage reference value, and a second negative sequence voltage reference value of the series three-phase converter;
wherein, the preset voltage control equation comprises:
wherein, Kp6And Ki6Are series three-phase converters d (+ ω), respectivelys) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp7And Ki7Are respectively series three-phase converters q (+ ω [) ands) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp8And Ki8Are respectively series three-phase converters d (-omega)s) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp9And Ki9Are respectively a series three-phase converter q (-omega)s) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp10And Ki10Are series three-phase converters d (+ ω), respectivelyrm-ωr) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp11And Ki11Are respectively series three-phase converters q (+ ω [) andrm-ωr) Proportional and integral coefficients of the shaft voltage PI regulator.
Optionally, the control signal conversion module 300 may include:
the second two-phase static coordinate transformation unit is used for respectively carrying out two-phase rotation to two-phase static coordinate transformation processing on the direct-current component of the positive sequence voltage reference value, the direct-current component of the first negative sequence voltage reference value and the direct-current component of the second negative sequence voltage reference value to obtain the positive sequence voltage reference value, the first negative sequence voltage reference value and the second negative sequence voltage reference value of the three-phase converter connected in series under the two-phase static coordinate system;
the voltage reference value acquisition unit is used for adding the positive sequence voltage reference value, the first negative sequence voltage reference value and the second negative sequence voltage reference value to obtain a voltage reference value of the series three-phase converter under the two-phase static coordinate system;
and the space vector modulation unit is used for carrying out space vector modulation on the voltage reference value to obtain a first control signal, a second control signal and a third control signal of the series three-phase converter so as to control the series three-phase converter according to the first control signal, the second control signal and the third control signal.
An embodiment of the present application further provides a circuit controller, including:
a memory for storing a computer program;
a processor for implementing the steps of the fault-ride-through control method as described above when executing the computer program.
An embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the fault ride-through control method as described above.
The computer-readable storage medium may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The fault ride-through control method, the fault ride-through control device, the circuit controller and the computer readable storage medium of the variable frequency transformer provided by the present application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
Claims (4)
1. A method for fault ride-through control of a variable frequency transformer, comprising:
collecting a first power grid voltage, a second power grid voltage and a stator voltage by using a voltage sensor, collecting a stator current by using a current sensor, and collecting a rotor phase angle by using an encoder;
respectively carrying out three-phase static to two-phase static coordinate conversion processing on the first power grid voltage, the second power grid voltage, the stator voltage and the stator current to obtain a first power grid voltage vector, a second power grid voltage vector, a stator voltage vector and a stator current vector under a two-phase static coordinate system;
respectively carrying out positive and negative sequence separation calculation processing on the first power grid voltage vector, the second power grid voltage vector, the stator voltage vector and the stator current vector to obtain a first power grid positive sequence voltage vector, a first power grid negative sequence voltage vector, a second power grid negative sequence voltage vector, a stator positive sequence voltage vector, a stator negative sequence voltage vector, a stator positive sequence current vector and a stator negative sequence current vector under a two-phase static coordinate system;
respectively carrying out phase angle calculation processing on the first power grid positive sequence voltage vector, the first power grid negative sequence voltage vector and the second power grid negative sequence voltage vector to obtain a first power grid positive sequence voltage phase, a first power grid negative sequence voltage phase and a second power grid negative sequence voltage phase;
according to the rotor phase angle, the first power grid positive sequence voltage phase, the first power grid negative sequence voltage phase and the second power grid negative sequence voltage phase, respectively carrying out two-phase static-to-two-phase rotation coordinate transformation processing on the first power grid positive sequence voltage vector, the stator negative sequence voltage vector, the stator positive sequence current vector and the stator negative sequence current vector to obtain a first power grid positive sequence voltage direct current component, a stator positive sequence voltage direct current component and a stator positive sequence current direct current component under a stator positive sequence synchronous rotation coordinate system, obtain a stator negative sequence voltage direct current component under the stator negative sequence synchronous rotation coordinate system, and obtain a stator negative sequence current direct current component under the rotor negative sequence synchronous rotation coordinate system;
calculating the positive sequence voltage direct-current component, the stator negative sequence voltage direct-current component, the stator positive sequence current direct-current component and the stator negative sequence current component of the first power grid according to a preset voltage control equation to obtain a positive sequence voltage reference value, a first negative sequence voltage reference value and a second negative sequence voltage reference value of the series three-phase converter;
wherein the preset voltage control equation comprises:
wherein, Kp6And Ki6Are series three-phase converters d (+ ω), respectivelys) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp7And Ki7Are respectively series three-phase converters q (+ ω [) ands) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp8And Ki8Are respectively series three-phase converters d (-omega)s) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp9And Ki9Are respectively a series three-phase converter q (-omega)s) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp10And Ki10Are series three-phase converters d (+ ω), respectivelyrm-ωr) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp11And Ki11Are respectively series three-phase converters q (+ ω [) andrm-ωr) Proportional coefficient and integral coefficient of the shaft voltage PI regulator;
respectively carrying out two-phase rotation to two-phase stationary coordinate conversion processing on the direct-current component of the positive sequence voltage reference value, the direct-current component of the first negative sequence voltage reference value and the direct-current component of the second negative sequence voltage reference value to obtain a positive sequence voltage reference value, a first negative sequence voltage reference value and a second negative sequence voltage reference value of a three-phase converter connected in series under a two-phase stationary coordinate system;
adding the positive sequence voltage reference value, the first negative sequence voltage reference value and the second negative sequence voltage reference value to obtain a voltage reference value of a series three-phase converter under a two-phase static coordinate system;
and performing space vector modulation on the voltage reference value to obtain a first control signal, a second control signal and a third control signal of the series three-phase converter, so as to control the series three-phase converter according to the first control signal, the second control signal and the third control signal.
2. A fault ride-through control for a variable frequency transformer, comprising:
the signal acquisition unit is used for acquiring a first power grid voltage, a second power grid voltage and a stator voltage by using the voltage sensor, acquiring a stator current by using the current sensor and acquiring a rotor phase angle by using the encoder;
the first two-phase static coordinate transformation unit is used for respectively carrying out three-phase static to two-phase static coordinate transformation processing on the first power grid voltage, the second power grid voltage, the stator voltage and the stator current to obtain a first power grid voltage vector, a second power grid voltage vector, a stator voltage vector and a stator current vector under a two-phase static coordinate system;
the positive and negative sequence separation unit is used for respectively carrying out positive and negative sequence separation calculation processing on the first power grid voltage vector, the second power grid voltage vector, the stator voltage vector and the stator current vector to obtain a first power grid positive sequence voltage vector, a first power grid negative sequence voltage vector, a second power grid negative sequence voltage vector, a stator positive sequence voltage vector, a stator negative sequence voltage vector, a stator positive sequence current vector and a stator negative sequence current vector under a two-phase static coordinate system;
the phase angle calculation unit is used for performing phase angle calculation processing on the first power grid positive sequence voltage vector, the first power grid negative sequence voltage vector and the second power grid negative sequence voltage vector respectively to obtain a first power grid positive sequence voltage phase, a first power grid negative sequence voltage phase and a second power grid negative sequence voltage phase;
the two-phase rotating coordinate transformation unit is used for respectively carrying out two-phase static-to-two-phase rotating coordinate transformation processing on the first power grid positive sequence voltage vector, the stator negative sequence voltage vector, the stator positive sequence current vector and the stator negative sequence current vector according to a rotor phase angle, the first power grid positive sequence voltage phase, the first power grid negative sequence voltage phase and the second power grid negative sequence voltage phase to obtain a first power grid positive sequence voltage direct current component, a stator positive sequence voltage direct current component and a stator positive sequence current direct current component under a stator positive sequence synchronous rotating coordinate system, obtain a stator negative sequence voltage direct current component under the stator negative sequence synchronous rotating coordinate system and obtain a stator negative sequence current direct current component under the rotor negative sequence synchronous rotating coordinate system;
the reference voltage calculation module is used for calculating the first power grid positive sequence voltage direct-current component, the stator negative sequence voltage direct-current component, the stator positive sequence current direct-current component and the stator negative sequence current component according to a preset voltage control equation to obtain a positive sequence voltage reference value, a first negative sequence voltage reference value and a second negative sequence voltage reference value of the series three-phase converter;
wherein the preset voltage control equation comprises:
wherein, Kp6And Ki6Are series three-phase converters d (+ ω), respectivelys) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp7And Ki7Are respectively series three-phase converters q (+ ω [) ands) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp8And Ki8Are respectively series three-phase converters d (-omega)s) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp9And Ki9Are respectively a series three-phase converter q (-omega)s) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp10And Ki10Are series three-phase converters d (+ ω), respectivelyrm-ωr) Proportional and integral coefficients, K, of a shaft voltage PI regulatorp11And Ki11Are respectively series three-phase converters q (+ ω [) andrm-ωr) Proportional coefficient and integral coefficient of the shaft voltage PI regulator;
the second two-phase static coordinate transformation unit is used for respectively carrying out two-phase rotation to two-phase static coordinate transformation processing on the direct-current component of the positive sequence voltage reference value, the direct-current component of the first negative sequence voltage reference value and the direct-current component of the second negative sequence voltage reference value to obtain a positive sequence voltage reference value, a first negative sequence voltage reference value and a second negative sequence voltage reference value of the three-phase converter connected in series under the two-phase static coordinate system;
the voltage reference value acquisition unit is used for adding the positive sequence voltage reference value, the first negative sequence voltage reference value and the second negative sequence voltage reference value to obtain a voltage reference value of the series three-phase converter under a two-phase static coordinate system;
and the space vector modulation unit is used for carrying out space vector modulation on the voltage reference value to obtain a first control signal, a second control signal and a third control signal of the series three-phase converter so as to control the series three-phase converter according to the first control signal, the second control signal and the third control signal.
3. A circuit controller, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the fault ride-through control method as claimed in claim 1 when executing the computer program.
4. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of the fault ride-through control method as claimed in claim 1.
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| CN111478346B (en) * | 2020-04-13 | 2023-03-28 | 广东电网有限责任公司 | Fault ride-through control method of variable frequency transformer |
| CN111181177B (en) * | 2020-04-13 | 2020-07-14 | 广东电网有限责任公司佛山供电局 | Torque and power fluctuation suppression method for variable frequency transformer |
| CN113241773B (en) * | 2021-05-24 | 2022-07-12 | 广东电网有限责任公司 | Residential area power distribution operation control method and device |
| CN113131494B (en) * | 2021-06-17 | 2021-08-24 | 广东电网有限责任公司佛山供电局 | Method, system, equipment and medium for controlling maximum capacity transmission of variable frequency transformer |
| CN113725905B (en) * | 2021-08-30 | 2023-06-02 | 广东电网有限责任公司 | Variable frequency transformer fault ride-through control method and device |
| CN114649816B (en) * | 2022-03-10 | 2024-09-27 | 广东电网有限责任公司 | Variable frequency transformer fault ride-through control method and device |
| CN114583717A (en) * | 2022-03-10 | 2022-06-03 | 广东电网有限责任公司 | Method and device for suppressing torque and reactive fluctuation of variable-frequency transformer |
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