CN220254382U - Power generation controller and power generation system - Google Patents
Power generation controller and power generation system Download PDFInfo
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- CN220254382U CN220254382U CN202321149112.4U CN202321149112U CN220254382U CN 220254382 U CN220254382 U CN 220254382U CN 202321149112 U CN202321149112 U CN 202321149112U CN 220254382 U CN220254382 U CN 220254382U
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Abstract
The application provides a power generation controller and power generation system relates to motor power generation technical field for realize higher pressure regulating precision and better dynamic characteristic in full rotational speed scope, promote power generation system's electric energy quality and system stability. The power generation controller includes: the device comprises a plurality of rectifying modules, a control protection module, an excitation switching module, a voltage conditioning module and an excitation control output module. The input end of each rectifying module is respectively connected with a corresponding stator winding in the permanent magnet machine, and the turns of different electronic windings are different; the output ends of all the rectifying modules and the output ends of the control protection module are respectively connected with the input ends of the excitation switching module; the excitation switching module is used for selecting the direct-current voltage output by the corresponding rectifying module based on the control signal input by the control protection module; the output end of the excitation switching module and the output end of the voltage conditioning module are respectively connected with the input end of the excitation control output module; the excitation control output module is used for outputting excitation voltage.
Description
Technical Field
The application relates to the technical field of motor power generation, in particular to a power generation controller and a power generation system.
Background
In aviation high-power alternating current power supply systems, three-stage electric excitation synchronous motors are widely used as generators. In a start/generate integrated system, the motor is used to operate in a start and generate mode. Under the power generation mode of the traditional three-stage electric excitation synchronous motor, the power generation controller rectifies the electric energy of the permanent magnet machine into exciting electric energy provided by the exciting machine, the voltage conditioning module adopts an integrated control chip to realize pulse width modulation, the reference voltage of the voltage conditioning module is set to be unchanged, when the rotating speed or the load of the generator is changed, the output voltage of the main motor is changed, the changed voltage is compared with the reference voltage, the pulse width of a PWM (Pulse width modulation ) signal output by the voltage conditioning module is changed, the duty ratio of an exciting power switch is automatically adjusted through a closed loop to change the output voltage of the exciting control output module, and therefore the aim of accurately adjusting the output voltage of the main motor is achieved.
For the traditional constant-frequency or narrow-frequency-conversion generator, the rotating speed of the generator is almost unchanged or the change range is smaller, and the output voltage of the permanent magnet machine is almost unchanged or the change range is narrower. For a wide-frequency-conversion three-stage electric excitation synchronous motor, the higher the rotating speed of the generator is, the higher the output voltage of the permanent magnet machine is, and the smaller the excitation current required by the generator is at high rotating speed or light load, so the following two problems are necessarily existed:
when the rotation speed is low, the output voltage of the permanent magnet machine is low, but the excitation voltage required by the exciter is high, the duty ratio D of the excitation power tube of the power generation controller is definitely too large, even insufficient conditions occur, and the generator cannot output the reference voltage; when the rotation speed is high, the output voltage of the permanent magnet machine is high, the exciting current required by the exciter is very small, the duty ratio D of an exciting power tube of the power generation controller is very small, the voltage oscillation of a generator end can be caused by the interference of a little outside on the duty ratio D, the stability is difficult, and the control is difficult. Therefore, the generator is likely to fail to work normally under high rotation speed and light load conditions.
Disclosure of Invention
The embodiment of the application provides a power generation controller and a power generation system, which are used for realizing higher voltage regulation precision and better dynamic characteristics in a full rotation speed range, so as to improve the power quality and the system stability of the power generation system.
An embodiment of the present utility model provides a power generation controller including: the device comprises a plurality of rectification modules, a control protection module, an excitation switching module, a voltage conditioning module and an excitation control output module:
the input end of each rectifying module is respectively connected with a corresponding stator winding in the permanent magnet machine, and the turns of different electronic windings are different; the rectification module is used for performing uncontrolled rectification on the output voltage of the corresponding stator winding to obtain direct-current voltage;
the output ends of all the rectifying modules and the output ends of the control protection module are respectively connected with the input ends of the excitation switching module; the excitation switching module is used for selecting the direct-current voltage output by the corresponding rectifying module based on the control signal input by the control protection module;
the output end of the excitation switching module and the output end of the voltage conditioning module are respectively connected with the input end of the excitation control output module; the excitation control output module is used for outputting excitation voltage.
In an alternative embodiment provided by the utility model, the excitation switching module comprises n-1 switch assemblies, and n is the number of rectifying modules.
In an optional embodiment provided by the utility model, the lowest direct-current voltage output by the rectifying module is directly connected to the output end of the excitation switching module; and other direct-current voltages output by the rectifying module are respectively connected to the output end of the excitation switching module through corresponding switch assemblies.
In an alternative embodiment provided by the present utility model, the switch assembly includes: MOS tube, diode and resistor;
the grid electrode (G) of the MOS tube is connected with the output end of the control protection module and is used for receiving the control signal output by the control module;
the drain electrode (D) of the MOS tube is connected with the output end of the rectifying module;
the source electrode (S) of the MOS tube is grounded through the resistor and is connected with the output end of the excitation switching module through the diode.
In an optional embodiment of the present utility model, the control protection module is connected to the permanent magnet motor, and is configured to obtain a rotation speed of the three-stage excitation synchronous generator corresponding to a frequency of the output voltage of the permanent magnet motor, and determine the control signal according to the rotation speed of the three-stage excitation synchronous generator.
In an alternative embodiment provided by the utility model, the control protection module determines the control signal by comparing the engine speed with n-1 switching speed points, where n is the number of rectification modules.
In an optional embodiment provided by the utility model, according to the excitation voltage requirement of the exciter of the three-stage electric excitation generator in the full power generation rotating speed range and the full load working condition, corresponding permanent magnet machine output voltages are selected in different rotating speed ranges so as to fit a permanent magnet machine output voltage curve, and the n-1 switching rotating speed point is determined according to the permanent magnet machine output voltage curve.
In an alternative embodiment provided by the utility model, the number of turns of the electronic winding is proportional to the output voltage of the stator winding.
An embodiment of the present utility model provides a power generation system including: the device comprises an aeroengine, a three-stage excitation synchronous motor, airborne electric equipment and the power generation controller;
the three-stage excitation synchronous motor is respectively connected with the aero-engine, the airborne electric equipment and the power generation controller;
the three-stage excitation synchronous motor comprises a permanent magnet machine, wherein the permanent magnet machine comprises a plurality of stator windings, and the turns of different electronic windings are different.
In an alternative embodiment provided by the present utility model, the three-stage excitation synchronous motor further includes: an exciter and a main motor;
the exciter is connected with an excitation control output module in the power generation controller and is used for receiving excitation voltage output by the excitation control output module;
the main motor is connected with the airborne electric equipment.
The utility model provides a power generation controller and a power generation system, wherein the power generation controller comprises: the device comprises a plurality of rectifying modules, a control protection module, an excitation switching module, a voltage conditioning module and an excitation control output module. The input end of each rectifying module is respectively connected with a corresponding stator winding in the permanent magnet machine, and the turns of different electronic windings are different; the rectification module is used for performing uncontrolled rectification on the output voltage of the corresponding stator winding to obtain direct-current voltage; the output ends of all the rectifying modules and the output ends of the control protection module are respectively connected with the input ends of the excitation switching module; the excitation switching module is used for selecting the direct-current voltage output by the corresponding rectifying module based on the control signal input by the control protection module; the output end of the excitation switching module and the output end of the voltage conditioning module are respectively connected with the input end of the excitation control output module; the excitation control output module is used for outputting excitation voltage. The stator windings of the permanent magnet machine are designed into a plurality of sets, the direct-current voltage is output after uncontrolled rectification is carried out through the corresponding rectifying modules, and then the corresponding permanent magnet machine output voltage is selected under different rotating speeds through the excitation switching module, so that higher voltage regulation precision and better dynamic characteristics are realized in a full rotating speed range, and the electric energy quality and the system stability of a power generation system are further improved.
Drawings
FIG. 1 is a schematic diagram of a power generation system according to the present disclosure;
FIG. 2 is a graph of output voltage of the permanent magnet machine provided by the present application;
FIG. 3 is a graph of the fitted permanent magnet machine output voltage provided by the present application;
FIG. 4 is a graph comparing output duty cycle curves of the present utility model and conventional schemes provided herein;
FIG. 5 is a schematic diagram of the circuitry within the excitation switching module provided herein;
fig. 6 is a schematic diagram of a switching state of the excitation switching circuit provided in the present application.
Detailed Description
In order to better understand the technical solutions described above, the technical solutions of the embodiments of the present application are described in detail below through the accompanying drawings and the specific embodiments, and it should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of the present application, and not limit the technical solutions of the present application, and the embodiments of the present application and the technical features in the embodiments of the present application may be combined with each other without conflict.
Referring to fig. 1, a power generation system according to an embodiment of the present utility model includes: the device comprises an aeroengine, a three-stage excitation synchronous motor, airborne electric equipment and the power generation controller.
The three-stage excitation synchronous motor is respectively connected with the aero-engine, the airborne electric equipment and the power generation controller; the three-stage excitation synchronous motor comprises a permanent magnet machine, wherein the permanent magnet machine comprises a plurality of stator windings, and the turns of different electronic windings are different.
Specifically, the three-stage excitation synchronous motor further comprises: an exciter and a main motor; the exciter is connected with an excitation control output module in the power generation controller and is used for receiving excitation voltage output by the excitation control output module; the main motor is connected with the airborne electric equipment.
As shown in fig. 1, a power generation controller provided in an embodiment of the present utility model includes: the device comprises a plurality of rectification modules, a control protection module, an excitation switching module, a voltage conditioning module and an excitation control output module:
the input end of each rectifying module is respectively connected with a corresponding stator winding in the permanent magnet machine, and the turns of different electronic windings are different; the rectification module is used for performing uncontrolled rectification on the output voltage of the corresponding stator winding to obtain direct-current voltage; the number of turns of the electronic winding is proportional to the output voltage of the stator winding.
The output ends of all the rectifying modules and the output ends of the control protection module are respectively connected with the input ends of the excitation switching module; the excitation switching module is used for selecting the direct-current voltage output by the corresponding rectifying module based on the control signal input by the control protection module;
the output end of the excitation switching module and the output end of the voltage conditioning module are respectively connected with the input end of the excitation control output module; the excitation control output module is used for outputting excitation voltage.
In this embodiment, according to the excitation power and excitation power requirements of the exciter in the three-stage excitation synchronous motor, the stator winding of the permanent magnet machine is designed into 2 or more sets of windings, and the number of turns of the stator winding is respectively N1, N2, … … and Nn, so that multiple sets of permanent magnet machine voltages with different voltage values can be output at the same rotation speed: vpmg1, vpmg2, … …, vpmgn.
When the generator is at a high rotating speed, the output voltage of the permanent magnet machine is higher, the direct-current voltage output by the rectifying module is also higher, the exciter needs smaller exciting voltage Vf to adjust the output voltage of the generator to the reference voltage, and because the voltage conditioning module outputs the duty ratio D=vf/Vo of PWM (Pulse width modulation ) waves, a smaller exciting direct-current power Vo is needed to avoid the too small duty ratio, and higher voltage adjusting precision and better dynamic performance can be kept.
When the rotation speed is low, the output voltage of the permanent magnet machine is low, the direct-current voltage output by the rectifying module is also low, and the exciter needs to adjust the output voltage of the generator to the reference voltage by the aid of the high exciting voltage Vf, so that the PWM wave output by the voltage conditioning module has the high duty ratio to ensure that the exciting control output module outputs the sufficient exciting voltage Vf, and when the generator is in a full-load or overload working condition, the requirement on exciting current is high, the duty ratio is too large, and the power generation controller cannot output the sufficient exciting voltage. Therefore, the larger exciting direct current power source Vo is selected, the duty ratio of the generator at a low rotating speed can be reduced, and the generator controller is ensured to have enough excitation output capacity under the full-load or overload working condition.
According to the embodiment of the utility model, the requirements of the three-stage excitation synchronous motor on excitation voltages at different rotating speeds are integrated, different PMG voltages are selected through the excitation switching module, a PMG voltage curve for actually providing an excitation power supply is fitted, the output voltage Vo of the excitation switching module can be controlled in a smaller range and is changed less along with the rotating speed, the duty ratio D of PWM output by the voltage conditioning module is controlled in a better range, the voltage regulation precision can be improved, and better dynamic performance is obtained.
The embodiment provides a power generation controller and power generation system, the power generation controller includes: the device comprises a plurality of rectifying modules, a control protection module, an excitation switching module, a voltage conditioning module and an excitation control output module. The input end of each rectifying module is respectively connected with a corresponding stator winding in the permanent magnet machine, and the turns of different electronic windings are different; the rectification module is used for performing uncontrolled rectification on the output voltage of the corresponding stator winding to obtain direct-current voltage; the output ends of all the rectifying modules and the output ends of the control protection module are respectively connected with the input ends of the excitation switching module; the excitation switching module is used for selecting the direct-current voltage output by the corresponding rectifying module based on the control signal input by the control protection module; the output end of the excitation switching module and the output end of the voltage conditioning module are respectively connected with the input end of the excitation control output module; the excitation control output module is used for outputting excitation voltage. The stator windings of the permanent magnet machine are designed into a plurality of sets, the direct-current voltage is output after uncontrolled rectification is carried out through the corresponding rectifying modules, and then the corresponding permanent magnet machine output voltage is selected under different rotating speeds through the excitation switching module, so that higher voltage regulation precision and better dynamic characteristics are realized in a full rotating speed range, and the electric energy quality and the system stability of a power generation system are further improved.
In an optional embodiment of the present utility model, the control protection module is connected to the permanent magnet motor, and the control protection module is configured to obtain a rotation speed of the three-stage excitation synchronous generator corresponding to a frequency of the output voltage of the permanent magnet motor, and determine the control signal according to the rotation speed of the three-stage excitation synchronous generator. The switching instruction of the excitation switching module comes from the control protection module of the power generation controller, the rotating speed of the generator is obtained by detecting the frequency of the output voltage of the permanent magnet machine, the output voltage of the permanent magnet machine of the corresponding channel is selected according to the rotating speed of the generator, and the control signal output by the control protection module to the excitation switching module is determined.
Specifically, in this embodiment, first, according to the excitation voltage requirements of the three-stage electric excitation generator for the exciter under the full power generation rotating speed range and the full load working condition, the corresponding permanent magnet machine output voltages are selected in different rotating speed ranges, so as to fit a permanent magnet machine output voltage curve, and the n-1 switching rotating speed point is determined according to the permanent magnet machine output voltage curve. And then the control protection module determines the control signal by comparing the rotating speed of the engine with n-1 switching rotating speed points, wherein n is the number of the rectifying modules.
In an alternative embodiment provided by the utility model, the excitation switching module comprises n-1 switch assemblies, and n is the number of rectifying modules. The lowest direct-current voltage output by the rectifying module is directly connected to the output end of the excitation switching module; and other direct-current voltages output by the rectifying module are respectively connected to the output end of the excitation switching module through corresponding switch assemblies.
Wherein, the switch assembly includes: MOS tube, diode and resistor; the grid electrode (G) of the MOS tube is connected with the output end of the control protection module and is used for receiving the control signal output by the control module; the drain electrode (D) of the MOS tube is connected with the output end of the rectifying module; the source electrode (S) of the MOS tube is grounded through the resistor and is connected with the output end of the excitation switching module through the diode.
By taking the practical application scene of the aircraft power supply system as an example for explanation, the power generation controller and the power generation system provided by the utility model make up for the defects of the traditional three-stage constant-frequency or narrow-frequency generator voltage regulation method, improve the voltage regulation precision and dynamic characteristics of the wide-frequency generator and are easy to realize.
Specifically, the required exciting power and exciting voltage Vf are determined according to the exciter in the full rotation speed range and under the full load working condition. According to the no-load output voltage Vpmg (N is the number of turns of the stator winding of the permanent magnet machine; K is a constant coefficient (about 1.1-1.25), f is frequency (n=60 f/p, wherein N is the rotational speed of the permanent magnet machine; f is the pole logarithm of the permanent magnet machine), and phi is magnetic flux, the output voltage Vpmg is proportional to the rotational speed N of the permanent magnet machine when the number of turns N of the permanent magnet machine is fixed, and the output voltage Vpmg is proportional to the number of turns N of the stator winding of the permanent magnet machine when the number of turns N of the permanent magnet machine is fixed. The output voltage curves of the windings of different permanent magnet machines are shown in fig. 2, wherein the number of winding turns corresponding to Vpmg1, vpmg2 and Vpmg3 are respectively N1, N2 and N3, and N1 is less than N2 and less than N3, so that at the same rotating speed, vpmg1 is less than Vpmg2 and less than Vpmg3.
The required exciting voltage is smaller when the generator is at a high rotating speed, so that smaller permanent magnet machine voltage is selected; at low rotation speeds, the required excitation voltage is large, so that a large permanent magnet machine voltage is selected. Selecting two switching rotating speed points ns1 and ns2, and taking Vpmg3 as the output voltage of the permanent magnet machine when the rotating speed of the generator is smaller than ns 1; when the rotation speed of the generator is greater than ns1 and smaller than ns2, the output voltage of the permanent magnet machine is Vpmg2, and when the rotation speed of the generator is greater than ns2, the output voltage of the permanent magnet machine is Vpmg1, and a fitted output voltage curve of the permanent magnet machine is shown in figure 3. The switching rotation speed points ns1 and ns2 are generally determined by taking 1/3 and 2/3 positions between the maximum rotation speed and the minimum rotation speed in the output voltage curve of the permanent magnet machine.
The permanent magnet machine output voltages Vpmg1, vpmg2 and Vpmg3 are subjected to uncontrolled rectification through a rectification module to respectively obtain Vo1, vo2 and Vo3, the output voltage curves of the permanent magnet machine are obtained according to the fitted permanent magnet machine output voltage curves, and when the rotating speed of the generator is smaller than ns1, vo=Vo3; when the generator rotation speed is greater than ns1 and less than ns2, vo=vo2, and when the generator rotation speed is greater than ns2, vo=vo1. The voltage conditioning module outputs the duty ratio d=vf/Vo of PWM, and in the idle state in the full rotation speed range, the duty ratio curve and the duty ratio curve of the conventional scheme in the present utility model are shown in fig. 4 respectively. The duty ratio of the utility model is improved at high rotation speed, and better pressure regulating precision and dynamic response can be obtained at high speed; at low rotation speeds, the duty cycle of the utility model is reduced, but still within a reasonable duty cycle range, so that the generator controller has enough excitation output capability under full load or overload conditions.
Different permanent magnet machine output voltages can be selected through the excitation switching module in fig. 1, and an excitation switching circuit schematic diagram is shown in fig. 5, wherein Vo1 is direct current voltage output after the uncontrolled rectification of Vpmg1 and is directly connected to an output end Vo of the excitation switching circuit; vo2 is direct-current voltage outputted after the Vpmg2 is subjected to uncontrolled rectification by a rectification module, and is connected to an output end Vo of the excitation switching circuit through a switching MOS tube Q2; vo3 is a direct-current voltage outputted after the Vpmg3 is subjected to uncontrolled rectification by the rectification module, and is connected to the output end Vo of the excitation switching circuit through the switching MOS tube Q3.
The switching of the direct-current voltage channels output by different rectifying modules is realized through the on-off of the MOS transistors Q2 and Q3, the logic state of the switch is shown in figure 6, wherein the state 1 represents on, and the state 0 represents off. When the rotation speed of the generator is smaller than ns1, Q3 is turned on, Q2 is turned off, and since Vo3 is larger than Vo1, the excitation switching module outputs vo=Vo3; when the rotation speed of the generator is greater than ns1 and smaller than ns2, Q2 is turned on, Q3 is turned off after a certain time delay, and at the moment, the excitation switching module outputs vo=Vo2; when the generator rotation speed is greater than ns2, both Q2 and Q3 are turned off, and at this time, the excitation switching module outputs vo=vo1. In order to avoid the fluctuation of the output voltage of the generator caused by instantaneous power failure in the switching process of the output voltage channel of the permanent magnet machine, the lowest voltage Vpmg1 of the output voltage of the permanent magnet machine is directly connected to the output end through the direct current voltage Vo1 which is output after the direct current voltage is subjected to uncontrolled rectification by the rectification module, so that the instantaneous power failure of the excitation power source Vo caused in the switching process can be avoided.
The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and are intended to be included in the scope of the present utility model.
Claims (10)
1. A power generation controller, characterized in that the power generation controller comprises: the device comprises a plurality of rectification modules, a control protection module, an excitation switching module, a voltage conditioning module and an excitation control output module:
the input end of each rectifying module is respectively connected with a corresponding stator winding in the permanent magnet machine, and the turns of different electronic windings are different; the rectification module is used for performing uncontrolled rectification on the output voltage of the corresponding stator winding to obtain direct-current voltage;
the output ends of all the rectifying modules and the output ends of the control protection module are respectively connected with the input ends of the excitation switching module; the excitation switching module selects the direct-current voltage output by the corresponding rectifying module based on the control signal input by the control protection module;
the output end of the excitation switching module and the output end of the voltage conditioning module are respectively connected with the input end of the excitation control output module; the excitation control output module is used for outputting excitation voltage.
2. The power generation controller of claim 1, wherein the excitation switching module includes n-1 switching components, n being the number of rectifying modules.
3. The power generation controller according to claim 2, wherein the lowest direct-current voltage output in the rectifying module is directly connected to the output terminal of the excitation switching module; and other direct-current voltages output by the rectifying module are respectively connected to the output end of the excitation switching module through corresponding switch assemblies.
4. A power generation controller according to claim 2 or 3, wherein the switch assembly comprises: MOS tube, diode and resistor;
the grid electrode (G) of the MOS tube is connected with the output end of the control protection module and is used for receiving a control signal output by the control module;
the drain electrode (D) of the MOS tube is connected with the output end of the rectifying module;
the source electrode (S) of the MOS tube is grounded through the resistor and is connected with the output end of the excitation switching module through the diode.
5. The power generation controller according to claim 1, wherein the control protection module is connected to the permanent magnet machine motor, and is configured to obtain a three-stage excitation synchronous generator rotation speed corresponding to a frequency of the output voltage of the permanent magnet machine motor, and determine the control signal according to the three-stage excitation synchronous generator rotation speed.
6. The power generation controller of claim 5, wherein the control protection module determines the control signal by comparing an engine speed to n-1 switching speed points, n being the number of rectifier modules.
7. The power generation controller according to claim 6, wherein corresponding permanent magnet machine output voltages are selected in different rotation speed ranges according to excitation voltage requirements of the three-stage electric excitation generator under the full power generation rotation speed range and the full load working condition, so as to fit a permanent magnet machine output voltage curve, and the n-1 switching rotation speed point is determined according to the permanent magnet machine output voltage curve.
8. The power generation controller of claim 1, wherein the number of turns of the electronic winding is proportional to the output voltage of the stator winding.
9. A power generation system, the power generation system comprising: aero-engine, three-stage excitation synchronous motor, on-board electrical equipment, and power generation controller as claimed in any one of claims 1-8;
the three-stage excitation synchronous motor is respectively connected with the aero-engine, the airborne electric equipment and the power generation controller;
the three-stage excitation synchronous motor comprises a permanent magnet machine, wherein the permanent magnet machine comprises a plurality of stator windings, and the turns of different electronic windings are different.
10. The power generation system of claim 9, wherein the three-stage excitation synchronous motor further comprises: an exciter and a main motor;
the exciter is connected with an excitation control output module in the power generation controller and is used for receiving excitation voltage output by the excitation control output module;
the main motor is connected with the airborne electric equipment.
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| CN202321149112.4U CN220254382U (en) | 2023-05-12 | 2023-05-12 | Power generation controller and power generation system |
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| CN202321149112.4U CN220254382U (en) | 2023-05-12 | 2023-05-12 | Power generation controller and power generation system |
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