论文部分内容阅读
在包含多微源的微网系统中,微源逆变器输出功率的精确控制和离/并网运行模式下控制目标的自动切换对于微网电压和频率的稳定以及潮流的控制都具有重要意义。在下垂控制的基础上,提出了基于本地测量的自适应双虚拟阻抗和功率补偿导纳控制方法,消除了不同类型线路阻抗引起的功率耦合,改善了离网时负载分配的准确性。同时,通过提出一种自适应的电压补偿方法,实现了分布式电源离/并网运行的统一控制,并改善了离网时的电能质量和并网时输出功率的跟踪精度。通过建立离/并网模式下逆变器的小信号模型,对控制器参数进行了优化设计。仿真和实验结果验证了理论分析的正确性和所提出的控制方法的有效性。
In micro-grid systems with multiple micro-sources, the precise control of the output power of the micro-source inverter and the automatic switching of control targets in the off-grid operation mode are of great importance to the stability of microgrid voltage and frequency and the control of power flow . Based on droop control, an adaptive double virtual impedance and power compensation admittance control method based on local measurement is proposed, which eliminates the power coupling caused by different types of line impedance and improves the accuracy of load distribution when off-grid. At the same time, by proposing an adaptive voltage compensation method, unified control of distributed power supply / grid operation is achieved, and the power quality when off-grid and the tracking accuracy of output power when grid connected are improved. Through setting up the small signal model of the inverter under the grid-connected mode, the controller parameters are optimized. Simulation and experimental results verify the correctness of the theoretical analysis and the effectiveness of the proposed control method.