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| Research on a kind of AC Voltage Sensorless Control Strategy of Grid-connected Inverter |
| Hu Shuju,Gong Wenming,Li Fenglin,Meng Yanfeng,Wang Lingling |
| Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China |
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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.
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Received: 10 July 2014
Published: 08 September 2015
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2015, Vol. 30 
