The Research On Asymmetric Voltage Regulator With Distributed Generation

Recent years, people pay more attention to the distributed generation, it has high energy efficiency.The distributed generation uses renewable clean energy, such as the solar energy, the wind power, the tidal energy and so on. It has not only protected the environment, saved the energy, but also made the energy which we can use diversely. In order to utilize disperse energy resources and improve utility system reliability, distributed generations are applied in power system more and more widely. But the access of a large amount of distributed generation will bring the new challenge to the operation and control of the distribution network. one is the influence on the power quality.The paper classifies and discusses several popular distributed generation techniques firstly, analyses the advantage and disadvantage of it and the influence on distributed network, the problem of three-phase asymmetric in power system is outlined. Then the grid inverter system is introducted, and a detailed analysis of the dynamic voltage regulator (DVR) method to voltage is presented.Based on the instantaneous reactive power theory, the paper proposed an improved diction method to voltage. Finally,because of the growing number of asymmetric in the actual system of distributed power generation system.This paper designs the asymmetric voltage regulator based on distributed power generation system.the three-phase asymmetric voltage regulator are united in the distributed power generation system, achieved the PCC voltage regulation when the load is asymmetric under the grid-connected circumstances. Dual loops for power and current are chosed as the control strategy., by optimizing the design of the PI parameters of the average power control loop, current control loop, making the distributed power generation inverter device have a great voltage regulation performance of stable and dynamic responses in the grid-connected situation. The principle and control strategy of propoed system are analyzed and verified by simulation with Matlab / Simulink the simulation results prove the feasibility of the system and control strategy above.