摘要
在电网电压不平衡工况下,变流器工作在稳压模式时直流母线电压会出现二倍频波动。针对这个问题,分析了电网电压不平衡条件下变流器稳压运行时直流母线电压二倍频波动产生机理,提出了一种基于比例积分谐振(PIR)控制器的直流稳压控制策略。在原有直流稳压控制策略的基础上,增加2次比例谐振(PR)控制,解决了现有技术无法完全避免的直流母线电压二倍频波动的问题,且无须对电流进行正负序分离及复杂的计算获取电流指令。最后,分别通过仿真和实验,验证了所提控制策略的有效性。
Under the condition of unbalanced grid voltage,the DC bus voltage will occur the second harmonic wave when the converter works in the voltage stabilizing mode.In order to solve this problem,the mechanism of DC bus voltage second harmonic wave during voltage stabilization operation of converter under unbalanced power grid voltage is analyzed.The DC voltage stabilization control strategy based on the proportional integral resonance(PIR)controller is proposed.On the basis of the original DC voltage stabilization control strategy,the secondary proportional resonance(PR)control is added to solve the problem that the current technology can not completely avoid the second harmonic wave of the DC bus voltage.It is not necessary to separate the positive and negative sequence of the current and obtain the current command through complex calculation.Finally,the effectiveness of the proposed control strategy is verified by simulation and experiment.
作者
刘重洋
魏亚龙
刘刚
范书豪
祁招
LIU Chongyang;WEI Yalong;LIU Gang;FAN Shuhao;QI Zhao(XJ Electric Co.,Ltd.,Xuchang 461000,China)
出处
《电器与能效管理技术》
2023年第2期68-73,共6页
Electrical & Energy Management Technology
基金
河南省重大科技专项项目(201111210400)。
