CN116566258B - Pulse width modulation-based harmonic suppression method for electro-magnetic doubly salient generator - Google Patents
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/2173—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a biphase or polyphase circuit arrangement
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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Abstract
An electro-magnetic doubly salient motor harmonic suppression method based on pulse width modulation relates to the field of motor control. The non-sinusoidal counter potential characteristic of the electro-magnetic doubly salient generator causes non-sinusoidal output current and larger harmonic, and in addition, the motor cannot use methods such as sinusoidal pulse width modulation, voltage vector pulse width modulation and the like to restrain the harmonic in combination with the special structure of DSEG. In order to solve the problems, the invention provides a harmonic suppression method with a variable PWM duty ratio, which is used for comparing and analyzing the actual output current of DSEG with the output current in an ideal state to obtain deviation, and then controlling the deviation by using PID to realize real-time suppression of current harmonic. The invention well inhibits the output current harmonic wave when the electro-magnetic doubly salient power generation system normally operates, so that the output current is more in line with the ideal situation.
Description
Technical Field
The invention belongs to the field of electrical control, and particularly relates to a pulse width modulation-based harmonic suppression method for an electro-magnetic doubly salient generator.
Background
The electric excitation doubly salient generator is a novel alternating current brushless direct current motor, has the structure similar to a switch reluctance motor, has the advantages of simple and reliable structure, good fault tolerance performance, flexible control and the like, and can generate electricity in a full period. Therefore, the electric excitation doubly salient generator can be used as a motor applied to high-temperature and high-speed occasions, and has wide application prospects in the field of power generation of airplanes and automobiles. The efficiency of the electro-magnetic doubly salient generator is improved, and the reduction of the generator loss is one of the important methods for realizing the improvement of the efficiency of the electro-magnetic doubly salient generator and reducing the fuel loss and pollution emission.
However, the special structure of the electro-magnetic doubly salient generator makes the counter-potential waveform of the electro-magnetic doubly salient generator non-Sinusoidal, the non-Sinusoidal characteristic of the counter-potential can cause that the phase current has larger harmonic component, namely the output current waveform is also non-Sinusoidal, so that not all harmonic suppression methods can be applied to the electro-magnetic doubly salient generator, such as sine Pulse-Width-Modulation (SPWM), space vector Pulse-Width-Modulation (SVPWM) and other methods are not applicable to the electro-magnetic doubly salient generator, and the rectification effect of the non-controlled rectification method is poor, and the controllable rectification of the electro-magnetic doubly salient generator is an important technical means for improving the output voltage and the output power of the electro-magnetic doubly salient generator system. Therefore, aiming at the defects of the prior research proposed above, the patent aims to inhibit the output current harmonic wave of the power generation system under PWM control, improve the output performance of the normal operation of the electro-magnetic doubly salient generator and reduce the influence of the harmonic wave on the output performance of the system.
Through searching, the patent with the Chinese patent application number of CN202210181988.0 discloses a harmonic suppression method for an electric vehicle charger. The method comprises the following steps: 1) Constructing a charger topological structure form of a single-phase PWM rectification mode of a prepositive LCL filter; 2) Establishing a mathematical model of the single-phase PWM rectification charger; 3) Analyzing harmonic characteristics in an electric vehicle charger model; 4) The harmonic suppression method based on the PI current regulator is analyzed, and a PI control structure of the charger system is established; 5) By adopting a current composite control method of RC and PI, a PIRC composite repeated controller of the PWM rectifying charger is established, the duty ratio of PWM is optimized to inhibit the generation of low-order harmonic waves, and the method is applied to the current harmonic wave inhibition at the network side of the charger. The method can inhibit odd harmonics in the current of the grid side of the PWM rectification charger, increase the open loop gain of the control system of the electric automobile charger, improve the steady state and dynamic performance of the charger system and realize the static-difference-free tracking of the current of the grid side of the charger.
Through searching, the patent with the Chinese patent application number of CN202110109640.6 discloses a harmonic suppression method of a low-loss variable current system of a high-speed multiphase permanent magnet synchronous motor. According to the phase numbers, the phase shift angles among the multiphase windings are determined through a harmonic suppression algorithm, harmonic components of a motor system in the active rectification and variable-frequency speed regulation processes are suppressed through a harmonic suppression algorithm module, harmful harmonic mathematical expressions are separated through Fourier analysis, a current model under a rotating coordinate system is established, and suppression is performed through a harmonic suppression link. And finally, realizing the equivalent high switching frequency of the main power device through a three-level main topological structure, and executing the driving control of the harmonic suppression algorithm. The invention can reduce the technical index requirements of a control system and a main power device and inhibit the uncontrollable amplification of the multiphase motor to the internal harmonic wave of the driving system; the potential safety hazards of heating, noise, tremble and the like caused by system harmonic waves are reduced; the system loss is reduced, and the quick response and stable operation under the driving of the multiphase motor converter are realized.
The invention discloses a harmonic suppression method for pulse width modulation controllable rectification of an electro-magnetic doubly salient generator, and relates to the field of motor control. The invention can improve the output performance of the normal operation of the electro-magnetic doubly salient generator, reduce the influence of output current harmonic waves on the output performance of the system, improve the efficiency of the electro-magnetic doubly salient generator, reduce the loss of the generator, and is suitable for application scenes such as multi-electric aircraft with higher requirements on the operation efficiency of the system. However, because of the special structure of the electro-magnetic doubly salient generator, the output current is in a non-Sinusoidal waveform, and a Sinusoidal Pulse-Width-Modulation (SPWM) method, a space vector Pulse-Width Modulation (SVPWM) method, and the like, cannot be adopted for the electro-magnetic doubly salient generator, so that a PWM control method is adopted under the control of rectification. Specifically, under the controllable rectification of an electro-excited doubly salient generator, an upper bridge arm connected with a phase winding in a rising region of a phase inductance takes a duty ratiod r Chopping, in the inductance falling region, the lower bridge arm connected with the phase winding with the duty ratiod r On the basis of the PWM control strategy of chopping, the actual output current is calculatedi a With a given currenti ref Comparison output deviationeAnd a PID controller is adopted to change PWM duty ratio aiming at the deviation, and output current is changed in real time, so that the output current is closer to a given sinusoidal current, and the aim of inhibiting current harmonic waves is fulfilled.
Compared with other inventions, the scheme provided by the invention is characterized in that:
1. the research object of the invention is an electro-magnetic doubly salient generator;
2. compared with the harmonic suppression method of the electric vehicle charger, the invention provides that the actual output current of the electro-magnetic doubly salient generator is compared with the given reference sinusoidal current to output deviation, and a PID controller is adopted for the deviation to change PWM duty ratio in real time to suppress the output current harmonic, and the harmonic suppression method of the electric vehicle charger adopts RC plus PI current compound control;
3. compared with a harmonic suppression method of a low-loss variable current system of a high-speed multiphase permanent magnet synchronous motor, the method is mainly aimed at the real-time deviation value of actual output current and given reference sinusoidal current, but not harmonic content per se, calculation and analysis of harmonic components are not needed, the harmonic suppression method of the low-loss variable current system is aimed at the mathematical expression of harmful harmonic waves, a current model under a rotating coordinate system is established, and the current model is suppressed through a harmonic suppression link.
The invention provides that the actual output current is compared with the given current to output deviation, and the duty ratio is changed according to the deviation, so that the output current is changed, and is enabled to be closer to the given current, thereby achieving the purpose of restraining current harmonic wave, and not aiming at harmonic wave components in the output current, the invention is simpler and more convenient in operation. After the deviation value is obtained, the invention adopts a PID controller to change the PWM duty ratio, so that the actual output current is closer to the given reference current, and the current harmonic wave is suppressed.
Disclosure of Invention
In order to solve the technical problems, the invention provides a pulse width modulation-based harmonic suppression method for an electrically excited doubly salient generator. The output efficiency of the electro-magnetic doubly salient generator is improved, the loss of the generator is reduced, and the electro-magnetic doubly salient generator is more suitable for application scenes such as multi-electric aircraft, which have higher requirements on the system operation efficiency.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a pulse width modulation-based harmonic suppression method for an electro-magnetic doubly salient generator comprises the following steps:
s1, adopting a controllable rectifier and introducing PWM control, wherein the controllable rectifier is a three-phase full bridge formed by six anti-parallel diodes (IGBTs), and the PWM control method means that in a rising region of a phase inductor, an upper bridge arm connected with a winding corresponding to the IGBT conducted in one period is controlled by a duty ratiod r Chopping, in the inductance falling region, the lower bridge arm connected with the winding corresponding to the IGBT conducted in one period is controlled by the duty ratiod r Chopping by modulating the duty cycled r Controlling, namely changing the output characteristic of the PWM controllable rectifier;
s2, keeping the operation condition of the electrically excited doubly salient generator unchanged, namely keeping the rotating speed and the load of the electrically excited doubly salient generator unchanged, and collecting the phase current of the generator under PWM controli a And outputting a phase current waveform;
in the step S2, the working condition is kept unchanged, that is, the rotation speed and the load are kept unchanged, and the phase current is obtainedi a The calculation formula is as follows:
；
；
in the method, in the process of the invention,i cap in order to draw a current through the capacitor,i back to return the current of the electro-magnetically doubly salient generator,i DC for the direct current bus load current,i a andi c the current is A, C phase current respectively,u DC is the voltage of the direct current bus, and the voltage of the direct current bus is the voltage of the direct current bus,e a ande c the counter-potential of the A, C phases respectively,r a andr c a, C phase resistors respectively, wherein R is a load;
s3, according to the phase currenti a Gives the desired optimal output current command valuei ref And give the command valuei ref Parameters of (2);
the output current command value described in the step S3i ref After the output current under the actual working condition is obtained, the waveform is similar to sine but not sine, and on the basis, the determination can be based on the working condition of the current electro-magnetic doubly salient generatori ref And ensure the phase and frequency ofi ref Effective value of (2) and phase currenti a Is the same, thereby determiningi ref Giving a desired current waveform;
s4, the phase current in the steps S2 and S3 is obtainedi a And command valuei ref Comparing and outputting the current deviationWherein->；
S5, according to the current deviation obtained in the step S4The current deviation amount is +.>By PID control, the duty cycle is variedd r To phase currenti a And (3) adjusting:
in particular the current of the current phasei a <0, if the current deviation isFor regular increase of duty cycle, if the current deviation amount +.>Decreasing the duty cycle if negative; when phase currenti a >At 0, if the current deviation amount +.>For regular decreasing the duty cycle, if the current deviation amount +.> Is negativeThe duty cycle is raised;
in the step S5, the duty ratio is changed by PID control, specifically, the duty ratio of PWM controllable rectification is calculated by a PID controller from a set output current command value and an actual feedback output current;
s6, opposite phase currenti a After compensation, the steps S4 and S5 are continuously repeated, so that real-time harmonic suppression of the output current is realized;
s7, adjusting the phase current according to the steps S5 and S6i a ' FFT transforming it to check the harmonic component after adjustment, and comparing it with the harmonic component after FFT transforming of the current output by the PWM control method with fixed duty ratio;
s8, utilizing the duty ratio corresponding to the deviation under the working condition, selecting the controllable rectifying PWM duty ratio corresponding to the output current under the working condition according to the actual operation working condition of the electro-magnetic doubly salient generator, and controlling the controllable rectifying PWM duty ratio, so that the optimal harmonic suppression of the output current can be realized;
in step S8, the optimal harmonic suppression means that the current deviation described in S4 to S5 is utilized, closed loop control of the output current is regulated through PID control, and according to the actual running condition of the electrically excited doubly salient controllable rectifying power generation system, the duty ratio for enabling the optimal harmonic suppression of the output current of the system is obtained in real time, so that the harmonic suppression of the output current of the system is realized.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention analyzes the influence of output current harmonic waves on the output current by using the electrically excited doubly salient controllable rectifying power generation system, changes the duty ratio in real time by using the deviation amount, avoids the need of calculating harmonic components first and then controlling the current, saves time cost and calculation cost, and effectively inhibits the controllable rectifying output current harmonic waves under PWM control;
(2) The control method provides scientific reference basis for selecting the duty ratio under the control of PWM (pulse-Width modulation) controllable rectification for the electrically excited doubly salient controllable rectification power generation system, and changes the condition of lack of basis in the past. And the PID control is utilized to acquire the optimal duty ratio in real time, so that the suppression of system harmonic waves is realized. The control method reduces the overall loss of the electro-magnetic doubly salient power generation system and improves the working efficiency of the power generation system.
Drawings
FIG. 1 is a control block diagram of a pulse width modulation based method for harmonic suppression of an electro-magnetic doubly salient generator;
FIG. 2 is a flow chart of a method of harmonic rejection of a pulse width modulated based electro-magnetic doubly salient generator;
fig. 3 is a graph comparing the current harmonic content and total harmonic distortion (Total Harmonic Distortion, THD) of the proposed method and the PWM control method with a fixed duty cycle;
fig. 4 is a graph showing the comparison of the output current waveforms of the proposed method and the PWM control method with a fixed duty cycle.
Description of the embodiments
The invention is described in further detail below with reference to the attached drawings and detailed description:
examples
The embodiment of the invention provides a pulse width modulation-based harmonic suppression method for an electro-magnetic doubly salient generator.
The control system for operating the embodiment is shown in fig. 1, and mainly comprises an electrically-excited doubly-salient generator A1, an excitation controller A2 and a control circuit for detecting direct-current output voltageu DC Output voltage sensor A3 for detecting dc outputElectric currenti DC An output current sensor A4, a load A5 for detecting exciting currenti f Exciting current sensor A6 for detecting rotor position angleθVariable A7, controllable rectifier A8, variable duty cycle harmonic suppression method A9, and method for detecting motor torque and rotational speednAnd the torque and rotation speed sensor A10.
Based on a 12-8 pole electric excitation doubly salient generator model, finite element simulation analysis is carried out on phase currents. Compared with uncontrolled rectification, the controllable rectification based on PWM can increase the maximum value of phase current, improve the output voltage and the output current of the electro-magnetic doubly salient generator, and accelerate the phase change process that the phase current is changed from negative to positive and from zero to negative. It can be seen that the actual output current waveform has a larger deviation from the required sinusoidal current waveform, the deviation value will vary with the change of the working condition, and the deviation values at different times are different. In order to suppress current harmonics in real time and save time cost, a harmonic suppression method with a variable duty ratio is provided, and a control flow is shown in fig. 2.
The invention relates to a harmonic suppression method for PWM controllable rectification of an electro-magnetic doubly salient generator, which comprises the following steps:
s1, writing variable duty ratio in advance in a controllerd r The controller collects the output current through the output current sensor, thereby determining the parameters of the output current. In the rising region of a phase inductance, the upper bridge arm connected with the phase winding has a duty ratiod r Chopping, in the inductance falling region, the lower bridge arm connected with the phase winding with the duty ratiod r Chopping by modulating the duty cycled r The output characteristics of the PWM controllable rectifier can be changed by controlling;
s2, keeping the operation condition of the electrically excited doubly salient generator unchanged, namely keeping the rotation speed and the load of the electrically excited doubly salient generator unchanged (the rotation speed is 5000r/min, the load is 24.3 omega), and collecting the phase current of the generator under PWM controli a And outputting a phase current waveform;
s3, according to the phase currenti a Gives the desired optimal output current command valuei ref And give the command valuei ref Parameters of (2);
s4, the phase current in the steps S2 and S3 is obtainedi a And command valuei ref Comparing and outputting the current deviationWherein->；
S5, according to the current deviation obtained in the step S4The current deviation amount is +.>By PID control, the duty cycle is variedd r To phase currenti a Adjusting;
s6, opposite phase currenti a After compensation, the steps S4 and S5 are continuously repeated, so that real-time harmonic suppression of the output current is realized;
s7, adjusting the phase current according to the steps S5 and S6i a ' FFT transforming it to check the harmonic component after adjustment, and comparing it with the harmonic component after FFT transforming of the current output by the PWM control method with fixed duty ratio;
further, in step S2, the phase currenti a The calculation formula is as follows:
;
;
in the method, in the process of the invention,i cap in order to draw a current through the capacitor,i back to return the current of the electro-magnetically double salient motor,i DC for the direct current bus load current,i a andi c the current is A, C phase current respectively,u DC is the voltage of the direct current bus, and the voltage of the direct current bus is the voltage of the direct current bus,e a ande c the counter-potential of the A, C phases respectively,r a andr c a, C phase resistors and R is a load.
Further, in step S3, the output current command valuei ref After the output current under the actual working condition is obtained, the waveform is similar to sine but not sine, and on the basis, the determination can be based on the working condition of the current electro-magnetic doubly salient generatori ref And ensure the phase and frequency ofi ref Effective value of (2) and phase currenti a Is the same, thereby determiningi ref Giving a desired current waveform.
Further testing based on the above examples was as follows:
fig. 3 is a comparison diagram of the output current harmonic content (2 nd harmonic, 5 th harmonic) and THD of the PWM control method with a fixed duty ratio under the conditions that the rotation speed of the generator is 5000r/min, the load is 24.3 Ω, the bus voltage is 270V, and the power is 3 kW. It can be seen that when the method is adopted, the content of 2 times harmonic in the output current is effectively reduced by 6.87%, the content of 5 times harmonic in the output current is effectively reduced by 2.1%, and the THD of the output current is reduced by 6.12%. The current harmonic wave is effectively restrained, the overall loss of the electro-magnetic doubly salient power generation system is reduced, and the working efficiency of the power generation system is improved.
Fig. 4 is a graph comparing the output current phase a waveform of the PWM control method with fixed duty ratio with the generator rotation speed of 5000r/min, the load of 24.3 Ω, the bus voltage of 270V and the power of 3 kW. It can be seen that when the method provided by the patent is adopted, the waveform of the output current is more similar to sine, and the current harmonic wave is effectively restrained.
The above description is only of the preferred embodiment of the present invention, and is not intended to limit the present invention in any other way, but is intended to cover any modifications or equivalent variations according to the technical spirit of the present invention, which fall within the scope of the present invention as defined by the appended claims.
Claims (1)
1. The method for suppressing the harmonic waves of the electro-magnetic doubly salient generator based on pulse width modulation comprises the following steps of:
s1, adopting a controllable rectifier and introducing PWM control, wherein the controllable rectifier is a three-phase full bridge formed by six anti-parallel diodes (IGBTs), and the PWM control method means that in a rising region of a phase inductor, an upper bridge arm connected with a winding corresponding to the IGBT conducted in one period is controlled by a duty ratiod r Chopping, in the inductance falling region, the lower bridge arm connected with the winding corresponding to the IGBT conducted in one period is controlled by the duty ratiod r Chopping by modulating the duty cycled r Controlling, namely changing the output characteristic of the PWM controllable rectifier;
s2, keeping the operation condition of the electrically excited doubly salient generator unchanged, namely keeping the rotating speed and the load of the electrically excited doubly salient generator unchanged, and collecting the phase current of the generator under PWM controli a And outputting a phase current waveform;
in the step S2, the working condition is kept unchanged, that is, the rotation speed and the load are kept unchanged, and the phase current is obtainedi a The calculation formula is as follows:
；
；
in the method, in the process of the invention,i cap in order to draw a current through the capacitor,i back to return the current of the electro-magnetically doubly salient generator,i DC for the direct current bus load current,i a andi c the current is A, C phase current respectively,u DC is the voltage of the direct current bus, and the voltage of the direct current bus is the voltage of the direct current bus,e a ande c the counter-potential of the A, C phases respectively,r a andr c a, C phase resistors respectively, wherein R is a load;
s3, according to the phase currenti a Gives the desired optimal output current command valuei ref And give the command valuei ref Parameters of (2);
the output current command value described in the step S3i ref After the output current under the actual working condition is obtained, the waveform is similar to sine but not sine, and on the basis, the determination can be based on the working condition of the current electro-magnetic doubly salient generatori ref And ensure the phase and frequency ofi ref Effective value of (2) and phase currenti a Is the same, thereby determiningi ref Giving a desired current waveform;
s4, the phase current in the steps S2 and S3 is obtainedi a And command valuei ref Comparing and outputting the current deviationWherein；
S5, according to the current deviation obtained in the step S4The current deviation amount is +.>By PID control, the duty cycle is variedd r To phase currenti a And (3) adjusting:
in particular the current of the current phasei a <0, if the current deviation isFor regular increase of duty cycle, if the current deviation amount +.>Decreasing the duty cycle if negative; when phase currenti a >At 0, if the current deviation amount +.>For regular decreasing the duty cycle, if the current deviation amount +.> Is negativeThe duty cycle is raised;
in the step S5, the duty ratio is changed by PID control, specifically, the duty ratio of PWM controllable rectification is calculated by a PID controller from a set output current command value and an actual feedback output current;
s6, opposite phase currenti a After compensation, the steps S4 and S5 are continuously repeated, so that real-time harmonic suppression of the output current is realized;
s7, adjusting the phase current according to the steps S5 and S6i a ' FFT transforming it to check the harmonic component after adjustment, and comparing it with the harmonic component after FFT transforming of the current output by the PWM control method with fixed duty ratio;
s8, utilizing the duty ratio corresponding to the deviation under the working condition, selecting the controllable rectifying PWM duty ratio corresponding to the output current under the working condition according to the actual operation working condition of the electro-magnetic doubly salient generator, and controlling the controllable rectifying PWM duty ratio, so that the optimal harmonic suppression of the output current can be realized;
in step S8, the optimal harmonic suppression means that the current deviation described in S4 to S5 is utilized, closed loop control of the output current is regulated through PID control, and according to the actual running condition of the electrically excited doubly salient controllable rectifying power generation system, the duty ratio for enabling the optimal harmonic suppression of the output current of the system is obtained in real time, so that the harmonic suppression of the output current of the system is realized.
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| CN202310816680.3A CN116566258B (en) | 2023-07-05 | 2023-07-05 | Pulse width modulation-based harmonic suppression method for electro-magnetic doubly salient generator |
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| CN202310816680.3A CN116566258B (en) | 2023-07-05 | 2023-07-05 | Pulse width modulation-based harmonic suppression method for electro-magnetic doubly salient generator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110247597A (en) * | 2019-06-21 | 2019-09-17 | 南京航空航天大学 | Electric excitation biconvex electrode electric machine loss of excitation failure tolerant electricity generation system and its control method |
| CN114400949A (en) * | 2021-04-16 | 2022-04-26 | 南京航空航天大学 | Current shaping control method based on open-winding hybrid excitation doubly salient motor |
| CN114614725A (en) * | 2022-03-24 | 2022-06-10 | 南京师范大学 | Efficiency optimal control method for doubly salient electro-magnetic controllable rectification power generation system |
| CN115833697A (en) * | 2022-12-16 | 2023-03-21 | 南京航空航天大学 | Asymmetric current control method of electric excitation doubly salient power generation system |
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| CN110247597A (en) * | 2019-06-21 | 2019-09-17 | 南京航空航天大学 | Electric excitation biconvex electrode electric machine loss of excitation failure tolerant electricity generation system and its control method |
| CN114400949A (en) * | 2021-04-16 | 2022-04-26 | 南京航空航天大学 | Current shaping control method based on open-winding hybrid excitation doubly salient motor |
| CN114614725A (en) * | 2022-03-24 | 2022-06-10 | 南京师范大学 | Efficiency optimal control method for doubly salient electro-magnetic controllable rectification power generation system |
| CN115833697A (en) * | 2022-12-16 | 2023-03-21 | 南京航空航天大学 | Asymmetric current control method of electric excitation doubly salient power generation system |
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| 多电飞机双凸极电机高压直流并联供电***基础研究;许彦武;《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》;第1-158页 * |
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