Research On Control Method Of HVDC Light

The HVDC light technology has gradually developed into a new DC transmission technology based on PWM technology and full controlled devices based on IGBT,the traditional DC transmission technology can not fill the blank supplying passive systems.The HVDC light technology to control the independent control of the advantages of flexible and convenient,can complete the green grid,the active power and reactive power,which has received extensive attention and become a research hotspot of new transmission technology,this paper will mainly study on the control strategy of HVDC light technology.According to the main circuit topology of three-phase voltage source converter station,describes the working principle of voltage source converter, analyzed the modulation rectifier and inverter side(SPWM and SVPWM), the dynamic mathematical model is established in the dq0 coordinate system VSC.Through the analysis of VSC modulation strategy and principle of four quadrant,the double closed loop control system design of feed-forward decoupling and current inner loop and voltage outer loop uses voltage, PI parameter and using typical I type and II type control system is to complete the current and voltage looptuning.In order to ensure the steady state performance and dynamic performance of the system to achieve the requirements of the system, analyzed the damage affect the stability of the operating characteristics of the system and the DC side harmonics of the converter station equipment.The trigger simulation module by the simulation model and SVPWM to build VSC-HVDC in Matlab/Simulink,VSC-HVDC simulation system of the active power supply network,passive power supply network respectively,get active,reactive power,voltage,current,AC / DC system simulation results,improve the utilization of DC voltage,verify the decoupling control strategy of DC voltage,constant DC current,active power,reactive power,completed the independent control.The hardware experiment system through the TI TMS320LF2812 DSP controller as the control core,the actual waveform detection system of physical quantities,and the analysisof experimental results, conclusions verify the correctness of the control strategy of HVDC light technology.The research results of the thesis for further research of HVDC light technology has a certain reference value.