摘要
讨论了多端高压直流(MT-HVDC)系统中消除直流电压偏差和提高负载均流精度问题。为了尽量减少不同并联网络拓扑结构的电力线损耗,保证系统的稳定运行,提出了一种基于改进下垂控制的分散控制方法。采用平均直流输出电压,平均两个相邻变流器的输出电流的方式,减小控制系统中通信网络的拥塞以实现分散控制。通过最小化电缆的功率损耗,导出最佳的负载电流分配比例,以实现不同变换器之间的合理电流分配。最后,进行瞬态响应实验仿真以证明所提出的MT-HVDC系统的控制策略的可行性。
This paper discusses the problems of eliminating DC voltage deviation and improving load current sharing accuracy in multi-terminal high voltage direct current(MT-HVDC)system. In order to minimize the power line loss in different parallel network topologies and ensure the stable operation of the system,a decentralized control method based on improved droop control is proposed. Adopt the average DC output voltage and average the output current of two adjacent converters to reduce the congestion of the communication network in the control system for decentralized control. By minimizing the power loss of the cable,the optimal load current distribution ratio is derived to achieve a reasonable current distribution between the different converters. Finally,a transient response simulation is conducted to prove the feasibility of the proposed MT-HVDC control strategy.
作者
林亭君
LIN Ting-jun(School of Energy and Electricity,Hohai University,Nanjing,Jiangsu 211100,China)
出处
《计算技术与自动化》
2019年第1期31-36,共6页
Computing Technology and Automation
