基于电流型虚拟同步机控制的电解制氢负荷主动调频策略

Active Frequency Regulation Strategy for Electrolytic Hydrogen Production Load Based on Current-type Virtual Synchronous Machine Control

氢能作为一种零碳绿色的二次能源,具有能量密度大、转化效率高等优点。结合可再生能源电解制氢,能够实现氢气从制取到利用全过程的零碳排放,但由于制氢系统中各单元均通过电力电子变换器接入交流电网,系统惯量不足导致频率稳定性较差,亟需有效的频率调节措施,以期改善系统频率稳定性。该文基于全控型整流器作为电解堆栈的供电拓扑的方案,提出电流源型虚拟同步机控制策略,根据系统频率改变电解制氢负荷的制氢功率,实现暂态过程的惯量阻尼支撑及稳态时的一次频率调节,可在一定程度上提升系统的频率稳定性。实验结果表明,在切除交流母线负荷后,电解堆栈产生的氢气流量由109.8 mL/min提升至123.6 mL/min,证明了所提方法的正确性和有效性。

Hydrogen energy,as a zero-carbon green secondary energy,has the advantages of high energy density and high conversion efficiency.The integration of renewable energy electrolysis hydrogen production enables the entire process,from hydrogen production to utilization,to achieve zero carbon emission.However,the frequency stability is compromised due to the lack of inertia of the system,necessitating urgent implementation of effective frequency regulation measures to enhance stability.On the basis of the scheme of full control rectifier as the power supply topology of electrolytic stack,a control strategy of current source virtual synchronous machine is proposed in this paper.The hydrogen production power of electrolytic hydrogen production load is adjusted bases on the system frequency,so as to provide inertia damping support in the transient process and the primary frequency regulation in the steady state,This method contributes to enhancing the frequency stability of the system to a certain extent.Finally,the effectiveness of the proposed control strategy is verified through simulations on PSCAD/EMTDC simulation platform and experiments.