分布式光伏接入配电网对电压分布的影响

Influence of distribute photovoltaic access to distribution network on voltage profile

位于负荷中心的分布式光伏电源对配电网线路的电压分布有重大影响,在考虑无功负荷和线路电抗影响的前提下,首先经过理论计算和仿真验证,说明了单个分布式光伏(PV)对线路电压分布的影响与其接入位置和注入容量有很大关系;当多个PV接入时,不同容量组合和位置接入对电压分布的影响也不同。然后计算得出随接入位置的改变,PV的最大可接入容量不同,最后用仿真的方式说明了在PV接入点并联电抗器补偿或通过逆变器控制可以防止PV的接入所引起的电压越限问题。

The distribute photovoltaic located at load center has significant impact on feeders＇ voltage profile. Considering the reactive power and line reactance, after theoretical calculation and simulation, it is proved that the influence of distribution PV access to distribution network on voltage profile has great relationship with its access position and injection capacity; when there are multiple PV access to distribution network, the influence on voltage profile is different when combined capacity and location are different. Then the maximum alternative capacity at each node was calculated. AI last, it is illustrated through simulation that shunt reactor at PV node and inverter controlling can solve the voltage violation problem.