王金强,王思华.LCL型三相光伏并网逆变器新型控制策略研究[J].电测与仪表,2018,55(6):16-22. Wang Jinqiang,Wang Sihua.New control strategy for three-phase PV grid-connectedinverter with LCL filter[J].Electrical Measurement & Instrumentation,2018,55(6):16-22.
LCL型三相光伏并网逆变器新型控制策略研究
New control strategy for three-phase PV grid-connectedinverter with LCL filter
For LCL filter type photovoltaic grid-connected inverter is a high-order multivariable control system, the traditional parallel current control method, can not ensure that the system stability at the same time more than the suppression of the grid voltage in the harmonics, put forward a New Compound Current Control Technology Based on LCL - type Grid - connected Inverter. In order to suppress the inherent resonant spikes of the LCL filter, the active damping of the LCL filter is achieved by adding a notch filter in the current loop to improve the stability of the system without the need for additional sensors. The grid current regulator will (RC) and quasi-proportional resonance control (QPR) are used to improve the output current quality of the grid-connected inverter and reduce the influence of the local nonlinear load disturbance and the grid voltage fluctuation on the grid current. The frequency signal has no static tracking control and the unit power factor is connected. The correctness and validity of the active damping and repetitive quasi - PR control strategy of the notch are verified by Matlab / Simulink simulation test.
