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在不考虑暂态稳定情况下,为提高含大规模风电系统的运行经济性和电能质量,研究优化加装静止无功补偿器(SVC)的方法,改善含风电场电力系统的电压波动和系统降损问题。首先通过蒙特卡洛抽样得到风速和负荷状态,对每个状态进行潮流计算,获得各节点电压期望,以此确定补偿点的范围。在此基础上考虑降损效益、投资维护费用和电压偏移指标,采用场景分析法建立目标函数模型,在补偿范围内确定SVC的最佳补偿点和补偿容量,并采用改进的GA算法进行求解。以修正的IEEE30节点系统为例进行仿真计算,结果表明所提出的方法可有效抑制含风电电力系统的电压波动,提高系统运行的经济性。
In order to improve the operation economy and power quality of large-scale wind power systems without consideration of transient stability, a method of optimizing the installation of static var compensator (SVC) is studied to improve the voltage fluctuation and system of power system including wind farms Reduce the problem. Firstly, the wind speed and load status are obtained by Monte Carlo sampling, and the power flow calculation is performed for each state to obtain the voltage expectation of each node, so as to determine the range of compensation points. On this basis, the damage reduction benefit, investment and maintenance cost and voltage deviation index are considered. The objective function model is established by using scene analysis method. The optimal compensation point and compensation capacity of SVC are determined within the scope of compensation and the improved GA algorithm is used to solve the problem . Taking the modified IEEE30 node system as an example, the simulation results show that the proposed method can effectively suppress the voltage fluctuation of wind power system and improve the economy of system operation.