Research On TSC Dynamic Reactive Power Compensation Device

In the power system,since the inductive load consumes reactive power,the power factor of the system is reduced,and the energy loss in the power supply process is increased,and the system cannot guarantee excellent power quality.With the rapid development of power systems,the requirements for power quality and grid stability are getting higher and higher.Therefore,reactive power compensation is very necessary,which is one of the effective measures to ensure the efficient and stable operation of the entire power system.As a widely used reactive power compensation device,Static Var Compensator(SVC)has better compensation effect and good stability.The Thyristor Switched Capacitor(TSC)is a basic type of SVC and has been popular in recent years.Firstly,from the analysis of the basic working principle of TSC,the wiring mode of the main circuit,the input timing of the capacitor and the selection of the control target are introduced.The principle of switching the capacitor is analyzed in detail,and the calculation scheme of the capacitor compensation capacity is introduced.The 1:2:4:8 capacitor grouping method can greatly save the space occupied by the capacitor and the number of capacitor switching switches.Secondly,in the calculation of the electric quantity parameter,the selected algorithm is the fast Fourier transform FFT,which points out the advantages and disadvantages of the algorithm.The spectral effect caused by the spectral leakage caused by the truncated sampling signal and the non-synchronous sampling will affect the calculation accuracy.The Black-Harris window is added and the calculation method of double-line interpolation is carried out.The simulation results show that the method can effectively reduce the error and ensure the accuracy of the calculation results.Thirdly,the main control chip STM32F103RBT6 is selected on the hardware.This chip is a 32-bit processor product of ST company based on ARM Cortex-M3 architecture core,and has powerful data processing capability.The hardware design includes the design of the STM32 chip and its peripheral circuits,power supply circuits,A/D sampling circuits,zero-crossing detection and zero-crossing trigger circuits,human-machine dialog module circuits,and RS485 communication interface circuits.In software,this paper introduces the software design flow according to the function of the compensation device and its hardware circuit,including main program,A/D sampling program,amplitude and phase correction,man-machine dialogue program,capacitor switching program.,communication program and protection module program.Finally,based on the above research,a TSC reactive power compensation device is designed.The Matlab/Simulink platform was used to establish a suitable model,set parameters,and the TSC reactive power compensation system and capacitor zero-crossing input were simulated and verified.Through the analysis of the simulation results,it can be found that the device can achieve good reactive power compensation effect,power factor can be improved,power quality is improved,and the requirements of reactive power compensation are met.