Abstract：To reduce the impact of voltage fluctuations in distribution network, a Quadrature Filter (QF) based AC voltage sensorless control of 3-phase voltage source inverter has been proposed. The Second Order Generalized Integrator (SOGI) based Quadrature Filter outputs two quadrature signal with certain frequency, which eases the observation of grid voltage. Then the voltage observer of the inverter is built by the Quadrature Filter, and the grid voltage can be observed directly in the two phase static coordinate. Combined with PR control in the two phase static coordinate of the inverter, the AC voltage sensorless control of the inverter can be achieved. Compared with conventional virtual flux observation, the proposed method can get rid of the problems of windup, initial value sensitive and static error. Analysis shows that the proposed method does not reduce system stability. All the proposed methods and theories have been verified via simulations and experiments.
胡书举,龚文明,李丰林,孟岩峰,王玲玲,俞健. 一种并网逆变器无交流电压传感器控制策略研究[J]. 电工技术学报, 2015, 30(14): 325-332.
Hu Shuju,Gong Wenming,Li Fenglin,Meng Yanfeng,Wang Lingling. Research on a kind of AC Voltage Sensorless Control Strategy of Grid-connected Inverter. Transactions of China Electrotechnical Society, 2015, 30(14): 325-332.
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