风电氢联产系统功率平滑控制仿真研究

Power smoothing control and simulation of co-production system containing wind and hydrogen energy

风能的随机性会引起风力发电出力不平稳,与此同时,电网电压跌落会给风电机组带来脱网运行的风险。针对该问题,文章将电解槽-储氢罐-质子交换膜燃料电池循环系统作为储能装置,接入风力发电系统背靠背变换器直流侧,构成了风电氢联产系统。在风电过剩时,系统通过电解水制氢储存多余电能;在风能不足时,消耗氢气产生电能,补偿不足的有功功率。文章在分析系统构成及运行方式的基础上,设计了各组成单元协调控制策略。MATLAB仿真结果表明:在文章提出的控制策略作用下,系统可以有效地抑制风速随机变化引起的输出功率的波动;配电网电压跌落时,系统具有较强的抵御风机脱网的能力。

The randomness and intermittence of wind lead to unsmooth output power. At the same time,when the grid voltage drops,it will have the risk of wind generator separated from the power grid.To solve the above problems,a novel co-production system containing wind and hydrogen energy,which integrates an energy storage device in the direct current side of the back-to-back converter,is proposed. The circulatory system containing an electrolyzer-hydrogen tank and a proton exchange membrane fuel cell,is selected as the energy storage device. This system can convert excess power for other forms of energy, and release energy stored when wind energy is lack. Based on the analysis of system composition and operation mode,the coordinated control strategy of system is designed. MATLAB simulation results show that the system can effectively suppress the fluctuation of output power caused by random variation of wind,but also has a satisfactory performance during more serious grid voltage sags occurring.