基于柔性多状态开关的配电网电压波动平抑策略

由于分布式电源出力的波动性与随机性,其接入配电网后会造成电压波动问题。为此,提出了基于柔性多状态开关(flexiblemulti-stateswitch,FMSS)的电压波动平抑策略,利用柔性多状态开关的灵活调控能力对电压波动进行抑制。首先通过分析分布式电源与柔性多状态开关出力对配电网电压分布的影响,阐述了柔性多状态开关抑制电压波动的原理。然后建立了以配电网和柔性多状态开关运行状态为约束条件、以电压波动最小为目标函数的含柔性多状态开关的配网运行模型,通过粒子群算法(particleswarm optimization,PSO)进行优化求解,并提出了一种考虑时序电压变化量的电压波动指标。以三端口柔性多状态开关连接3个IEEE33节点网络为算例,通过仿真实验实现并验证了所提策略,检验了所提指标的可行性。仿真结果表明,所提策略在分布式电源接入情况下对配电网电压波动有良好的抑制效果。

Voltage Fluctuation Suppression Strategy Based on the Flexible Multi-state Switch in Distribution Network

The fluctuation and randomness of the output of distributed generation will cause voltage fluctuation when it is connected to the distribution network. We propose a voltage fluctuation suppression strategy based on flexible multi-state switch(FMSS) using its flexible control ability to reduce voltage fluctuation. Firstly, by analyzing the influence of distributed generation and flexible multi-state switch output on the voltage profile of distribution network, we elaborate the principle of FMSS to suppress voltage fluctuation. Then a distribution network operation model with FMSS is established, in which the operation state of distribution network and FMSS are taken as constraints and the minimum voltage fluctuation as objective function. The optimal solution is carried out by particle swarm optimization(PSO), and a chronological voltage fluctuation index is proposed. Moreover, a three-port FMSS connecting three IEEE33 nodes network is taken as an example to verify the feasibility of the proposed strategy through simulation experiments. The simulation results indicate that the proposed strategy performs a good effect on restraining the voltage fluctuation of distribution network with distributed generation access.