300kW光伏并网系统优化控制与稳定性分析

本文基于系统精确建模进行了300kW的光伏并网系统优化控制设计与稳定性分析,应用三相二电平电流控制电压源型的SVPWM逆变器以及LCL滤波器作为光伏阵列与电网之间的接口,具有前馈补偿的同步矢量电流PI控制器对三相光伏并网系统公共点的并网电流实现闭环控制,能够平滑快速地实现文中提出的光伏阵列最大功率点跟踪算法,同时使并网电能质量符合IEEEStd929—2000标准。仿真结果与实验结果验证了所提算法的有效性,充分表明了所提出的控制系统具有良好的动态与稳态性能。

Optimum Control and Stability Analysis for a 300kW Photovoltaic Grid-Connected System

The large-capacity centralized three-phase inverter for photovoltaic(PV) grid- connected system would be gradually going toward the market, so it is important to research on the optimum control and stability analysis for the large-scale PV grid-connected system. This paper aims to study the optimum control and stability analysis for a 300kW photovoltaic grid-connected system based on the accurate modeling system, and to verify the validation of the control algorithm through the simulation and experiment. A three-phase two-level voltage source inverter(VSI) with current-controlled space vector pulse width modulation (SVPWM) and LCL filter are used as the interface between the PV arrays and the utility grid. In the rotating frame synchronous with the grid vector voltage, the synchronous current vector PI controllers with feed forward compensation are used to control the grid-current of the common point in PV grid-connected system and to implement the proposed maximum power point tracking (MPPT) algorithm quickly and smoothly. A good quality power into the utility grid is achieved which is compliant with the IEEE Std929-2000. The simulated and experimental results verify the effectiveness of the proposed algorithm, which demonstrat that the proposed control system has good dynamic and static performance.