两级光伏并网发电系统控制策略研究

Research on Control Strategy of Two-stage Photovoltaic Grid-connected Power Generation System

对光伏并网发电系统进行研究,提出了两级光伏并网发电系统的结构和控制策略。在电路结构上,该系统前级电路采用Boost升压变换电路,后级电路采用三相逆变电路。在控制策略上,前级电路应用扰动观察法实现光伏发电系统的最大功率跟踪,后级电路通过电压电流双闭环控制实现并网控制,有效降低了控制策略的复杂度。最后,利用Matlab软件搭建了仿真模型,验证了所提控制策略的有效性。

The structure and control strategy of two-stage photovoltaic grid-connected power generation system are proposed by studying the photovoltaic grid-connected power generation system.In terms of circuit configuration,the front-stage circuit adopts Boost converter for voltage stepping up,and the rear-stage circuit utilizes the three-phase inverter circuit.Regarding the control strategy,the front-stage circuit adopts the perturbation and observation method to achieve maximum power point tracking of the photovoltaic power generation system,and the rear-stage circuit achieves grid-connected control through dual closed-loop control of voltage and current,which effectively reduces the complexity of the system.Finally,the simulation model is constructed using Matlab,which verifies the effectiveness of the proposed control strategy.