Research On SVC System Based On Asynchronous Generator Voltage Regulator

In order to overcome the shortcomings of the asynchronous generator with load capacity during operation,a static var compensator(SVC)with fast regulation characteristic is used to generate the reactive power to compensate for the reactive power loss of the asynchronous generator,in order to maintain the stability of terminal voltage.According to the change of terminal voltage when the load changes,the SVC voltage control strategy is proposed to control the terminal voltage.In this paper,the SVC system of asynchronous generator is studied,and the simulation model and the physical model are set up respectively.By comparing and analyzing the measured system voltage,the control effect of SVC on the terminal voltage of asynchronous generator is verified.This paper analyzes the transient mathematical model of asynchronous generator,analyzes the structure and working principle of SVC,deduces the mathematical model of SVC,and combines the characteristics of asynchronous generator itself to determine the compensation capacity of SVC.Use SVC to compensate the system reactive power shortage when load changes,it overcomes the shortcomings about traditional switching fixed capacitor slow and intermittent.Due to the structure of the TCR module of SVC,a certain amount of harmonics is generated,and the performance of the SVC system is improved by designing the filter for the specific harmonics.The p-q method and ip-iq method for traditional reactive power detection in SVC system is analyzed,and a new detection method based on instantaneous reactive power theory is proposed to improve the detection speed of reactive current and improve the detection accuracy.Several common control strategies of FC-TCR SVC are analyzed,and the voltage closed-loop control is finally adopted,and the PI controller is designed.According to the adopted control strategy,the main hardware circuit of SVC regulator system is designed,such as the design of power supply,signal sampling circuit design,voltage synchronous circuit design,thyristor digital trigger design,etc.;at the same time the software circuit is designed,Including the main program design,interrupt programming.The simulation and experiment of the isolated asynchronous generator are carried out.The correctness and accuracy of the simulation model are proved by the experimental results.The simulation and experiment of different PI control parameters under SVC regulation system based on asynchronous generator are carried out.The influence of different PI control parameters on the system is analyzed by the experimental results.The correctness and effectiveness of the asynchronous voltage regulator SVC system based on asynchronous generator voltage control are verified.Compared with the traditional switching capacitor fixed it has advantages,but the control system is still some flaws,still need to continue to improve.