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

作　　者：朱皓天 刘思阳 李旭东 谢锡峰[1,2] 舒泽亮 ZHU Haotian;LIU Siyang;LI Xudong;XIE Xifeng;SHU Zeliang(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 610031,China;Guangxi College of Water Resources and Electric Power,Nanning 530023,China)

机构地区：[1]西南交通大学电气工程学院,成都610031 [2]广西水利水电职业技术学院,南宁530023

出　　处：《高电压技术》2023年第12期5151-5160,共10页High Voltage Engineering

基　　金：国家自然科学基金(52077183);国家重点研发计划(2021YFB2601500)。

摘　　要：三相级联H桥整流器由于具有灵活性与易模块化的特点,使得其在电力电子变压器(powerelectronic transformer,PET)系统中得到了广泛应用。而该变换器相间-相内模块直流电压不均衡是其亟待解决的问题。针对该问题,提出一种直流电压均衡控制策略,实现相间直流电压均衡与相内模块间直流电压均衡。首先,提出零序补偿控制方案,以解决相间直流电压均衡问题,通过构建端口电压零序分量,在dq坐标系下分析零序功率分布,建立起相间直流电压与零序电压的线性关系。通过控制三相零序功率,实现相间均压的目的;接着,针对相内电压均衡问题,提出了一种脉宽调制和排序均压调制相结合的宽带载范围的均压算法,使部分模块可以空载运行,提高了相内直流电压均压能力。最后,建立了三相级联九模块整流器小功率实验平台。基于FPGA控制器完成了控制程序设计,验证了所提控制策略的正确性与有效性。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 

分 类 号：TM41[电气工程—电器] TM461