摘要
采用共交直流母线并联的VSC-HVDC系统可以提高其传输容量,但需要解决换流器模块间电流分配不均及环流问题。分析了零序环流产生的原因,建立了逆变侧并联模块的数学模型。在上述分析基础上,提出一种基于旋转坐标系的零序环流控制策略。通过模块并联以及载波移相技术,增加了系统的容量并提高了波形质量。仿真结果验证了控制策略的有效性。
The use of coAC DC bus parallel VSCHVDC system can increase its transmission capacity, but it needs to solve the problem of uneven current distribution and circulation between the converters. The causes of the zerosequence circulation are analyzed, and the mathematical model of the inverting side parallel module is estab lished. Based on the above analysis, a zerosequence circulation control strategy based on rotating coordinate system is proposed. Through the use of parallel modules and carder phase shift technology, system capacity has been in creased and waveform quality has been improved. The simulation results verify the effectiveness of the control strategy.
作者
付子义
杜田雨
FU Zi-yi, DU Tian-yu(School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454150, China)
出处
《软件》
2018年第9期16-20,共5页
Software
基金
国家重点研发计划专项资助(2016YFC0600906)
关键词
并联运行
共直流母线
零序环流
载波移相
Parallel operation
Common DC bus
Zero sequence current
Cartier phase shift
