基于功率解耦控制的电流注入式HVDC换流器运行特性的研究  

Research on operating characteristics of current reinjection HVDC converter based on power decoupling controls

作　　者：赵建阳[1] 张福民[1] 刘福贵[1] 刘永和[2,3] 

机构地区：[1]河北工业大学电磁场与电器可靠性省部共建重点实验室,天津300130 [2]内蒙古工业大学电力学院,内蒙古呼和浩特010080 [3]坎特伯雷大学电气与计算机系

出　　处：《电力系统保护与控制》2016年第10期17-23,共7页Power System Protection and Control

摘　　要：研究基于MLCR-CSC的HVDC换流器在电网不同工况下的功率控制特性。从实际工程角度出发,设计了两组MLCR-CSC(DMLCR-CSC)协调工作的方案,提出了双组多电平电流重注入换流器(DMLCR-CSC)作为HVDC换流器。分析了DMLCR-CSC在功率解耦控制的可行性,提出了有功功率和无功功率解耦控制思想。采用的9电平DMLCR-CSC主电路晶闸管器件具备零电流关断(ZCS)特点。在输电网正常工况下,网侧单相接地故障、两相短路故障和直流侧短路故障时,换流器可以在1/6个周期内把电流降到零,并且THD含量与触发角度无关。仿真验证了DMLCR-CSC构成的HVDC换流器是高压大功率电能传输的一种可靠的选择。This paper researches the power control features of HVDC converter under different working conditions of power grid, and HVDC converter based on MLCR-CSC. From the perspective of practical engineering, it designs a coordination operating scheme with two groups of MLCR-CSC （DMLCR-CSC）, and makes the double set of multilevel current reinjection converter （DMLCR-CSC） as an HVDC converter. It analyzes the feasibility of DMLCR-CSC power decoupling contrel, and proposes the active power and reactive power decoupling control method. Thyristors of nine-level DMLCR-CSC main circuit enable zero current turn off ZCS characteristics. Under normal working condition, single-phase ground fault on AC-side, two phase short circuit fault on AC-side and short-circuit faults on DC-side can shut down current to zero within 1/6 of a cycle. THD content is not relevant with trigger angle. Simulations verify that HVDC converter based on DMLCR-CSC is a reliable choice for high-voltage and high-power power transmission.

关 键 词：DMLCR-CSC 功率解耦控制 ZCS THD 运行特性 故障响应 

分 类 号：TM721.1[电气工程—电力系统及自动化]