配备储能装置的分布式光伏系统并网点电压调压策略研究

随着近年来光伏发电的飞速发展,光伏发电在电网中渗透率越来越高,在带来了清洁能源的同时也对电网造成了一定程度的影响。对分布式光伏系统接入配电网时接入前后并网点电压变化机理进行了研究,利用双向DC-DC变换器在光伏并网系统直流侧加装储能装置,在逆变器无功-有功调压方式的基础上提出含储能装置的并网点电压越限调整方案,通过仿真分析可以得出当光伏出力突变或配电网线路负荷变化的情况下,该方案能很好地抑制并网点电压的波动。

Voltage Adjustment Scheme for Grid-connected Points of Distributed Photovoltaic System with Energy Storage System

With the rapid development of photovoltaic power generation in recent years,the penetration of photovoltaic power generation in the power grid is getting higher and higher,which brings clean energy and also has a certain degree of impact on the power grid.The mechanism of the voltage change of the grid-connected point before the distributed photovoltaic system is connected to the distribution network and after accessing the distribution network is studied,using the bidirectional DC-DC converter to install the energy storage device on the DC side of the photovoltaic grid-connected system.Based on the active-reactive voltage regulation mode of the inverter,the grid-connected point voltage limit adjustment scheme with the energy storage device is proposed.By simulating the environment of sudden change in photovoltaic output and line load change of the distribution network,the scheme can well suppress the fluctuation of the grid voltage.