Search On The Simulation Of Chain SVG Based On RTDS

With the development of power electronics technology, variety ofelectrical equipment for power quality requirements continue to increase, powerquality of the reactive power compensation becomes increasingly important. ChainSVG has the advantages of a simple structure, modular and easy to expand, fastresponse, small size, low cost, and good harmonic characteristics, has become amodern power grid reactive power compensation device of choice.This paper introduces the basic principle of chain SVG first, and then based oninstantaneous reactive power theory establishes the ip-iq reactive current detectionmethods, introduces CPS-SPWM technology, finally introduces mastercontrol strategy from the active branch and reactive power branch of SVG maincontrol circuit. The chain SVG consists of many cascade connected H-bridge units.Each H-bridge has an independent DC capacitor. As a result, the DC-link voltagescould easily be unbalanced. Based on the master strategy to increase an in-phasevoltage control link. According to the deviation of DC side voltage and the settingvalue adjust the DC voltage control to achieve the DC voltage balance and improvethe control effect. Build a model using the RTDS, the above methods, techniques andcontrol strategies used in the simulation model. The simulation results show that themaster control strategy with phase voltage control link achieves the desired effects inresponse time and DC side voltage.Finally, Using RTDS to build a seven-chained SVG simulation prototype. Thesimulation prototype has the advantages of real time continuity; establish a connectionbetween hardware controller and software simulation model. The hardware controlleraccepts voltage and current signals from software simulation model and the hardwarecontroller generates control signals sent to simulation model by the RTDS to drive themodel of H-bridge. From the prototype experimental results, the control strategiesdescribed in this paper is feasible, and has a good compensation effect. Experimentalprototype model used in actual field parameters for reference, the measured dataresults are the same with the actual equipment so the prototype experiment haspractical significance.