基于FPGA的弱电网下并网逆变器控制器研究

Research on Controller of Grid-Connected Inverter in Weak Grid Based on FPGA

为了研究弱电网下,锁相环对系统稳定性的影响,基于FPGA设计并网逆变器的控制器,包括控制器的派克变换、PI控制器、锁相环等模型,设计基于FPGA的控制器。在dSPACE中搭建弱电网模型以及逆变器模型,设计仿真器。将控制器与仿真器进行互联,分别在弱电网正常条件与低电压穿越条件下对控制器进行稳定性验证,实现控制器硬件在环实验(CHIL)。对实验结果进行分析,得出搭建的基于SRF-PLL的控制器能够稳定地对并网逆变器进行控制的结论。

In order to study the influence of PLL on system stability in weak power grid,designs the controller of grid-connected inverter based on FP?GA,including the model of Park transform,PI controller and PLL of the controller,and designs the controller based on FPGA.In the dSPACE,builds the weak grid model and the inverter model,and the designs simulator.The controller and the simulator are interconnect?ed to verify the stability of the controller under the normal conditions of weak power grid and low voltage traversal conditions respectively,realizes the hardware in the loop experiment(CHIL)of the controller.Analyzes the experimental results and draws the conclusion that the SRF-PLL based controller can stably control the grid-connected inverters.