高电压技术2023，Vol.49Issue(12)：5151-5160,10.DOI:10.13336/j.1003-6520.hve.20230494
级联整流相内-相间直流电压均衡控制策略
Inner-phase and Mutual-phase DC Voltage Equalization Control Strategy for Cascaded Rectifier
摘要
Abstract
The three-phase cascaded H-bridge rectifier has been widely used in power electronic transformer(PET)sys-tems due to its flexibility and easy modularity.However,the voltage imbalance of mutual-phase and inner-phase modules is an urgent problem to be solved.In response to this problem,this paper proposes a DC voltage balancing control strate-gy to achieve mutual-phase and inner-phase DC voltage balance between modules.Firstly,this paper proposes a zero-sequence compensation control scheme to solve the problem of mutual-phase DC voltage equalization.By con-structing zero-sequence the component of the port voltage and analyzing the zero-sequence power distribution in the dq coordinate system,the linear relationship between mutual-phase DC voltage difference and zero-sequence voltage is es-tablished to control three-phase zero-sequence power and achieve the purpose of mutual-phase equalization.Subsequently,to solve the problem of inner-phase voltage equalization,this paper proposes a broadband load range voltage sharing al-gorithm that combines pulse width modulation and sorted voltage sharing modulation,enabling some modules to operate without load and improving the DC voltage sharing ability within the phase.Finally,a low-power experimental platform for the three-phase star cascade 9-module rectifier is established.The control algorithm is designed based on the FPGA controller,and the experiments verify the correctness and effectiveness of the control strategy proposed in this paper.关键词
电力电子变压器/级联H桥整流器/零序补偿/混合调制均压/宽带载范围Key words
power electronic transformer/cascaded H-bridge rectifier/zero-sequence compensation/mixed modulation equalization/wideband load range引用本文复制引用
朱皓天,刘思阳,李旭东,谢锡峰,舒泽亮..级联整流相内-相间直流电压均衡控制策略[J].高电压技术,2023,49(12):5151-5160,10.基金项目
国家自然科学基金(52077183) （52077183）
国家重点研发计划(2021YFB2601500).Project supported by National Natural Science and Foundation of Chi-na(52077183),National Key R&D Program of China(2021YFB2601500). （2021YFB2601500）
