摘要
基于逆阻型集成门极换流晶闸管(reverse blocking integrated gate commutated thyristor,RB-IGCT)的混合换相换流器(hybrid commutated converter,HCC)是抵御换相失败的有效方案,其应用于逆变侧在受端电网故障时的功率特性与常规直流系统存在差异,需开发新的控制策略实现故障穿越。首先,介绍了HCC的拓扑结构与工作原理,分析了逆变侧应用HCC的直流输电系统功率特性,揭示了故障期系统功率的变化规律,明确了系统功率与受端交流电网电压跌落程度、控制量等因素的影响机制。其次,针对受端电网电压跌落期间的功率波动问题,结合系统功率特性和CIGRE Benchmark控制模型,提出一种能提升交流故障期间有功传输水平,且抑制直流电流和无功瞬态波动的控制策略。最后,在某仿真软件中搭建系统模型进行仿真验证,结果表明,所提策略可提升HCC有功传输水平,并在故障初期和恢复初期能有效抑制其无功功率暂态波动。
The hybrid commutated converter(HCC)based on reverse blocking integrated gate commutated thyristor(RBIGCT)offers an effective solution to resist commutation failure.When deployed on the inverter side,its distinctive power characteristics during faults within the receiving-end power grid are significantly different from those of conventional DC systems.Consequently,a novel control strategy is essential to achieve robust fault ride-through.Firstly,this paper introduces the topological structure and operational principles of the HCC,analyzes the distinctive power characteristics of the DC transmission system which employs HCC on the inverter side during faults,reveals the underlying variation law of system power,and elucidates the precise influence mechanism between system power and critical factors such as the severity of receiving-end AC grid voltage drops and control variables.Secondly,targeting the power fluctuation in the receiving-end grid during voltage sags,and combined with the system power characteristics and the CIGRE Benchmark control model,a control strategy is proposed that can enhance the active-power transfer level during AC faults while simultaneously suppressing transient fluctuations in DC current and reactive power.Finally,a detailed system model is constructed and rigorously verified in the simulation environment.The results convincingly demonstrate that the proposed strategy successfully elevates the active power transmission level of the HCC and effectively suppresses transient reactive power fluctuations during both the initial fault phase and the recovery period.
作者
陈涛
刘长兵
韩伟
余占清
刘超
屈鲁
肖超
CHEN Tao;LIU Changbing;HAN Wei;YU Zhanqing;LIU Chao;QU Lu;XIAO Chao(State Grid Henan Electric Power Company,Zhengzhou 450000,Henan,China;Department of Electrical Engineering,Tsinghua University,Beijing 100084,China)
出处
《电网与清洁能源》
北大核心
2025年第11期34-43,共10页
Power System and Clean Energy
基金
国家自然科学基金项目(U2166602)。
关键词
高压直流输电
换相失败
混合换相换流器
功率特性
HVDC transmission
commutation failure
hybrid commutated converter
power characteristics
