多端直流输电系统中直流电压协调控制策略研究

摘要

DC voltage stability is the most important issue of multi-terminal direct current(MTDC), which demands coordinated control of each converter station to maintain the stability of the DC power grid in operation. At pre-sent the DC voltage coordination control strategy consist of two kinds of control strategy with communication and non-communication. This paper, firstly discussed the system coordinated control strategy of MMC-MTDC based on the basic operation principle of modular multilevel converter(MMC), and then it focused on research and de-sign of the three non-communication controller. Finally, a five terminal MMC-MTDC simulation model was built to verify and conduct comparison between the different dc-voltage coordinated controllers.%多端直流系统中直流电压的稳定是整个系统的核心，需要各个换流站之间协调控制，共同维持整个直流电网的稳定运行，目前直流电压协调控制策略主要分为有通信和无通信两大控制策略。针对基于模块化多电平换流器型多端直流输电系统(MMC-MTDC)，在介绍MMC的基本运行原理的基础上，论述了MTDC系统中两大系统协调控制策略，重点分析并设计了无通信类的3种控制器；旨在对现有的MTDC直流电压协调控制策略做出一个总结，为后续MTDC控制策略的研究提供技术参考；最后通过一个五端MMC-MTDC仿真模型验证和对比不同直流电压协调控制器的性能优缺点。