光伏电站接入电网的电能质量分析及其应用

Analysis and Application of Power Quality of Grid-connected Photovoltaic Power Station

鉴于现有光伏电站模型不便于电能质量分析,通过分析光伏电站的输出特性,提出了用受光照和温度控制的受控电压源和恒定谐波电流源分别模拟光伏电站出力和谐波特性的方法,并建立了光伏电站与电网系统的模型。最后,结合广东某地区电网的一个工程实例,以PSCAD/EMTDC为仿真平台,仿真光伏电站接入电网造成的电能质量影响并对仿真结果进行分析,验证了所提模型的可行性和有效性。

In view of current photovoltaic power station model being inconvenient to analyze power quality, by means of an-alyzing output characteristic of the photovoltaic power station, this paper presents a method of simulating output and har-monic characteristics of the photovoltaic power station respectively by using voltage source controlled by light intensity and temperature and constant harmonic current source as well as establishes models for the photovoltaic power station and power grid systems. Combining an actual engineering example of one power grid in Guangdong province, it makes simulation on influence of power quality of the grid-connected photovoltaic power station in PSCAD/EMTDC and analyzes corresponding results which verify feasibility and effectiveness of the proposed model.