当电网发生不对称故障时,为能够支撑电网,制氢电源需采用正负序分离的控制方式向电网提供正序无功并且吸收电网的负序无功,此时需要考虑故障期间系统的稳定性问题。该文研究了在不对称故障时,影响制氢电源的稳定性因素。首先简单介绍拓扑结构和控制方法,然后建立系统准稳态模型,并分别从电网电压正负序分量、网侧阻抗大小、正负序电流无功比例系数3个因素分析制氢电源稳定性。最后,通过仿真说明控制方法的可行性,并验证理论分析的合理性。
Abstract
When an asymmetrical fault occurs in the grid, in order to support the grid, the hydrogen generation power supply needs to use the positive-negative-sequence separation control method to provide positive-sequence reactive power to the grid and absorb the negative-sequence reactive power of the grid, and the stability of the system during the fault needs to be considered at this time. In this paper, the stability factors affecting the hydrogen production power supply during asymmetric faults are investigated. Firstly, the topology and control method are briefly introduced, and then a quasi-steady state model of the system is established, and the stability of the hydrogen power supply is analyzed from three factors, namely, the positive and negative sequence components of the grid voltage, the magnitude of the grid-side impedance, and the ratio coefficients of the positive and negative sequence currents to the reactive power, respectively. Finally, the feasibility of the control method is illustrated through simulation and the reasonableness of the theoretical analysis is verified.
关键词
制氢 /
整流器 /
无功功率 /
不对称故障 /
准稳态模型
Key words
hydrogen production /
rectifier /
reactive power /
asymmetric faults /
quasi-steady state modelling
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基金
国家自然科学基金（52077105）; 山东省自然科学基金面上项目（ZR2022ME214）
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