风电制氢系统阻抗建模及振荡特性分析

Impedance Modeling and Oscillation Characteristic Analysis of Hydrogen Production System by Wind Power

由于风电机组与主网呈现远距离逆向分布特点,高度电力电子化的风电就地制氢系统与电网互联时将存在振荡失稳的风险。对此,通过建立风电制氢系统的阻抗模型分析了其与电网互联时的振荡特性。首先,建立了考虑电解槽动静态电气特性的阻抗模型,并在此基础上采用双傅里叶变换,建立了包含电力电子变换器在内的电解水制氢设备阻抗模型;随后,结合风电机组的阻抗特性,分析了电网短路比以及制氢设备运行工况对风电制氢系统稳定性的影响。接着,对制氢设备控制参数进行了灵敏度分析,为提升系统稳定性的参数优化方案提供了指导;最后,构建了时域仿真模型,对所得结论进行验证。

Due to the distribution characteristics of long-distance and reverse of the wind turbines,there is a risk of os-cillation and instability when the hydrogen production system by wind power is connected to the power grid as a power electronics system.In this paper,the impedance model of hydrogen production system by wind power is developed to an-alyze the oscillation characteristics when connected to the power grid.Firstly,an impedance model considering the static-dynamic electrical behavior of the electrolytic cell is established,and thereby,a double-Fourier transform is used to establish the impedance model of water electrolytic equipment for hydrogen production including power electronic con-verter.Then,by combining with the impedance characteristics of the wind turbines,the influence of the grid short circuit ratio(SCR)and operating conditions on the stability of the hydrogen production system by wind power is analyzed.Af-terwards,the sensitivity analysis of the control parameters of hydrogen production equipment is carried out,which provides guidance for the parameter optimization to improve the system stability.Finally,the conclusions are verified through a time-domain simulation model.