含分布式光伏的配电网无功电压控制策略研究

Research on Reactive Voltage Control Strategy of Distribution Network with Distributed Photovoltaic

摘要:

随着配电网中分布式光伏等清洁能源渗透率的不断增加，有效地缓解了能源压力。但其并网点的电压越限问题不容忽视，为此，提出了一种含分布式光伏的配电网无功电压自适应控制策略。首先，分析了光伏并网点电压越限的基本原理；其次，针对负荷大扰动和光伏有功功率输出波动性引起的电压越限问题，分别提出自适应控制策略，通过降低光伏逆变器的有功功率以及增加无功功率的调节能力提高控制效果；最后，结合仿真算例进行分析，结果表明所提策略可以有效降低并网点电压，证明了所提策略的有效性。

Abstract:

With the continuous increase of penetration rate of clean energy such as distributed photovoltaic in distribution network, the energy pressure has been effectively alleviated. However, the problem of voltage violation at point of interconnection cannot be ignored. For this reason, an adaptive control strategy for reactive voltage of distribution network with distributed photovoltaic is proposed. Firstly, the basic principle of voltage violation of photovoltaic at point of interconnection is analyzed. Secondly, in view of voltage violation caused by large load disturbances and volatility of photovoltaic active power output, adaptive control strategies are proposed respectively to improve the control effect by reducing the active power of photovoltaic inverters and increasing the adjustment ability of reactive power. Finally, combined with the analysis of simulation examples, the results show that the proposed strategy can effectively reduce the voltage at point of interconnection, which proves the effectiveness of the proposed strategy.