考虑配电网电能节约率的分散式风电电压无功控制策略

Voltage and reactive power of control strategy of decentralized wind power considering the power saving rate of distribution network

分散式风电接入配电网具有减少系统网损、改善电能质量等优点。然而随着分散式风电在配电网中渗透率的增加,将带来一系列技术问题,其中电压无功控制困难的问题尤其严重。本文提出了一种考虑双馈型风力发电机不同控制模式影响的电压无功控制算法:以配电网的电能节约率为目标函数,在线路传输功率和节点电压约束下优化电压调节器的档位设置和电容器的开关状态,并采用灰狼算法进行求解。在修改的IEEE 13节点测试系统和IEEE 37节点测试系统的算例分析均表明,在双馈型风机的电压控制模式下,配电网的节能率能够达到最大,从而使总体具有最佳的经济性。同时,与穷举搜索法求得的结果对比,本文所采用的算法的结果与最优解非常接近,且耗时相对更少。

Decentralized wind power access to distribution network has the advantages of reducing system network loss and improving power quality.However,with the increase of the permeability of decentralized wind power in the distribution network,there will be specific technical problems.The problem of voltage and reactive power control is especially serious.In this paper,a voltage reactive control algorithm considering the effects of different control modes of dual-feed wind turbines is proposed:with the power saving rate of the distribution network as the objective function,the gear setting of the voltage regulator and the switching state of the capacitor are optimized under the constraints of line transmission power and node voltage,and the Gray Wolf Algorithm is used to solve it.The study analysis of the modified IEEE 13 node test system and the IEEE 37 node test system showed that the power saving rate of the distribution network can be maximized in the voltage control mode of the dual feeder,thus making the overall economy the best.At the same time,compared with the results obtained by the exhaustive search method,the results of the algorithm used in this paper are very close to the optimal solution,and the consuming time is relatively less.