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.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2016年第10期17-23,共7页
Power System Protection and Control
