并网光伏电站的一次调频特性分析

太阳能作为一种可再生、无污染的能源,具有较好的发展前景。当大规模光伏电站接入孤立电网时,将导致系统惯性降低,调频能力不足,威胁到电网的安全运行。针对此,文中改变光伏电站的功率控制方式,设定了光伏电站的减载水平和功频静态特性,使光伏电站参与系统的一次调频。通过在PSCAD/EMTDC软件中仿真分析,表明光伏电站在所提控制策略下实现了一次调频的功能,分担了常规电厂的一次调频压力,减小了系统频率的变化量,提高了系统的频率稳定性,验证了所提方法的有效性。

Analysis on Primary Frequency Regulation of Grid-connected PV Station in Power System

As a kind of clean and renewable energy , solar energy has good prospects for development .When, the large scale integration of photovoltaic power station accesses to isolated grid , which may cause the issue of low inertia and lack of ability of frequency regulation in power system , thus affecting the safe operation of the power system .In view of this , this paper changes the power control mode of PV station , sets load shedding level and static frequency characteristic of PV station , so the PV station can participate in primary frequency regulation of system .Through sim-ulation analysis in PSCAD/EMTDC, photovoltaic power station realizes the function of primary frequency regulation when the load changes , reducing the variation of system frequency and improving the frequency stability of power sys-tem, and the effectiveness of the method is verified .