光伏智能逆变器电压/无功控制研究

Research on volt/var control of photovoltaic intelligent inverter

随着大量光伏发电并网,引起了系统的电压波动与电压闪变,进而制约了光伏的接入容量。因此需要大容量、高输出质量和先进控制功能的智能逆变器。文章对光伏智能逆变器电压/无功控制方法进行了研究,该控制通过监测逆变器侧电压,并与电压/无功设定曲线比对,进而控制逆变器做出相应的调整。基于Open DSS仿真平台,分别在一般迭代潮流、时序潮流两种情况下,对该控制方法进行了实例分析。结果表明,其对改善电压,提高光伏接入容量方面功能显著。

With a large number of photovohaic systems are connected to the distribution network, the voltage fluctuation and voltage flicker of the network will rise, which restricts the capacity of PV connected to the grid. Therefore the intelligent inverter with characteristics of large capacity, high output quality and advanced control function is expected. The voltage/reactive （voh/var） con- trol method of photovohaic intelligent inverter is studied in this paper, which control inverter out- put by monitoring the inverter side voltage and matching it with the voh/var curve. The control method is analyzed respectively under the general iteration power flow and time series power flow circumstances on the OpenDSS simulation platform. The results show that it can improve voltage and increase capacity of photovoltaic connected to the grid.