风电调频补偿水锤效应的频率特性分析

水轮机在云南电网中占比很大，为了解决水轮机的水锤效应带来的功率反调现象，提出了一种考虑风电调频特性补偿水锤效应的分析方法。首先，建立了含风、水、网、荷的简单系统数学模型。其次，使用直流潮流法得到水轮机及其调频策略、风机及其调频策略所对应的代数微分方程和系统网络方程。并在此基础上进行线性化处理，推导出负荷扰动时水轮机和风机并网节点频率响应的频域解析式。根据解析式分析调频控制参数等对系统频率的影响。最后，通过以双机系统及实际电网的仿真分析对风机补偿水轮机水锤效应的有效性和可行性进行了验证。

Analysis of frequency characteristics of water hammer effect compensatedby wind power frequency modulation

Water turbines account for a large proportion of energy in the Yunnan power grid. To solve the problem of power inversion caused by the water hammer effect of the turbine, this paper presents an analysis method of compensating the effect by considering the frequency modulation characteristics of wind power. First, a simple systematic mathematical model including wind, water, network and load is established. Then the algebraic differential and systematic network equations corresponding to the hydraulic turbine and its frequency modulation strategy, the wind turbine and its frequency modulation strategy are obtained by the direct current power flow method. Then linearization is carried out. The frequency domain analytical expression of the frequency response of the turbine and wind turbine grid connected nodes under load disturbance is derived. The influence of frequency modulation control parameters on the system frequency is analyzed according to an analytical formula. Finally, the validity and feasibility of the wind turbine compensating the water hammer effect of hydraulic turbine are verified by a simulation analysis of the two-machine system and the actual power grid.This work is supported by the Key Project of National Natural Science Foundation of China (No. 52037003). asynchronous networking; wind power FM; water hammer effect; frequency modulation index