模块化多电平换流器的直流内电势解耦控制方法  

Decoupled Control of Inner DC Electric Potential of Modular Multilevel Converter

作　　者：杨文博[1] 宋强[1] 朱喆 李建国[1] 许树楷 刘文华[1] 

机构地区：[1]电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系),北京市海淀区100084 [2]南方电网科学研究院,广东省广州市510080

出　　处：《中国电机工程学报》2016年第3期648-655,共8页Proceedings of the CSEE

基　　金：国家863高技术基金项目(2011AA05A102)~~

摘　　要：换流器的直流端口电压控制对于直流输电系统运行特性和稳定性具有重要影响。论文将模块化多电平换流器(modular multilevel converter,MMC)的交流端口电流分量、直流端口电流分量和环流分量作为状态量,建立MMC的模型方程;提出对应于各电流分量的内电势的概念,并将内电势作为中间控制量,实现各电流状态量的直接解耦控制。所提出的方法可以实现直流内电势控制与子模块电容电压的解耦,并实现对直流端口电压快速直接的控制。最后通过仿真和物理试验证明了文中所提出的控制方法的可行性和有效性。The DC-link voltage control has a significant impact on the characteristics and stability of voltage source converter based high voltage DC（VSC-HVDC） transmission system. Using the AC-side current, DC-side current and circulating current as the state variables, this paper established a new state space model of MMC. The concept of inner electric potentials of MMC was proposed based on this model. The decoupled control of the AC side current, DC side current and circulating current can be archived by using the inner electric potential as the intermediate control variables. The proposed control method can also decouple the DC inner electric potential from the sub-module capacitors voltage and realize a fast control of the dc-link voltage. The simulation and experiment results verified the proposed control strategy.

关 键 词：柔性直流输电 模块化多电平换流器 直流电压控制 解耦控制 

分 类 号：TM46[电气工程—电器]