含分布式风电场的配电网电压波动分析与抑制

Voltage Fluctuation Analysis and Mitigation of Distribution Network Containing Distributed Wind Farm

提出一种含分布式风电场的配电网电压波动分析及多目标抑制策略。首先,分析了风电机组恒功率因数、恒电压和恒无功功率3种控制方式对电压波动抑制的影响,并建立其数学模型。其次,分析风参数和电网参数对电压波动的影响规律。然后,提出依靠风电机组的多目标电压波动抑制策略,在现有风电机组控制方式基础上,添加辅助电压波动抑制环节,通过快速控制并网点与电网的无功交换功率来抑制电压波动。最后,通过算例分析证明了所提策略可有效抑制并网点和传输线路的电压波动。

Grid integration of distributed wind power enlarges uncertainty of distribution network. As sensitivity of voltage fluctuation is strong for users, it is a challenge for traditional methods of mitigating voltage fluctuation. In order to solve this problem, voltage fluctuation analysis is conducted and mitigation strategy of distribution network containing distributed wind farm is put forward. Firstly, influences of different control strategies, such as power factor control, voltage control and reactive power dispatch, on voltage fluctuation mitigation are analyzed and mathematical models are given. Secondly, influences of wind speed and grid conditions on voltage fluctuation are analyzed. Finally, voltage fluctuation mitigation strategy is put forward as combined control scheme for wind turbines＇ exchanging reactive power with distributed network in order to reduce voltage fluctuation caused by wind power variation. Simulation shows that the proposed strategies can mitigate voltage fluctuation at point of common coupling（PCC） and distribution feeder effectively.