基于电网等值模型的电能质量试验电源研究

Study of power quality testing supply based on equivalent model of power grid

为了使电能质量试验电源更好地模拟实际电网的外特性,提出了基于电网等值模型的电能质量模拟方法。基于相似理论,进一步提出了相似程度d这一指标用于评价试验电源模拟的电能质量与"原型"的相似性。针对H桥级联型逆变器的试验电源拓扑结构,亦提出了基于重复学习控制的电压源虚拟阻抗控制策略,其能对基波情况下实际电网的外特性进行模拟,且可信度较高。最后,通过仿真验证了所提控制策略的有效性以及指标的可行性。

In order to better simulate external characteristics of actual grid using power quality testing supply, this pa- per proposes power quality simulation method based on equivalent model of power grid. In view of similarity theory, the similarity degree d is proposed as an index to evaluate the similarity between power quality simulated by testing supply and the prototype. With regard to H-bridge cascaded inverter topology, voltage source virtual impedance con- trol strategy based on repeated study control is also proposed in this paper. It can simulate external eharaeteristics of actual grid in fundamental situation, meanwhile it embraces high credibility. Ultimately, feasibility of proposed control strategy and index is verified by simulation.