考虑海上风电接入的电网侧无功补偿策略

A Power Network Side Reactive Power Compensation Strategy Considering Offshore Wind Farms Integrated

考虑大规模海上风电并网后的电压稳定性问题,以电力系统网络等值为基础,计算系统的电压稳定指标,基于各可调节节点对危险节点的灵敏度指标给出电压无功补偿策略。该控制策略的制定分成3个步骤:首先,根据电压稳定指标辨识危险节点;其次,计算可调节节点对危险节点电压稳定性的灵敏度,并以此甄别进行补偿的电源节点;最后,根据各节点的灵敏度指标分配各节点无功补偿量。在IEEE-14节点算例下的仿真结果表明,所提补偿策略能够有效改善海上风电接入后的局部电网电压稳定性。

This paper discusses voltage stability of the local power system after integration of large-scale offshore wind power.On the basis of the power system equivalent model,the voltage stability index of the bus is calculated.Moreover,according to the sensitivity which reflects the adjustable buses’reactive power compensation and the dangerous buses’voltage stability closely related,a new compensation strategy of reactive power is proposed.The strategy includes three steps.In the first step,the dangerous buses are recognized by the voltage stability indexes.Second,the compensation buses are identified in accordance with the results of the sensitivity calculation.Third,the reactive power compensation of each node is distributed depending on the the sensitivities.The simulation results in IEEE 14-bus system shows that the proposed strategy can enhance the voltage stability effectively when offshore wind power is connected to the local system.