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Research on starting-up control strategy of VSC-HVDC system

机译：VSC-HVDC系统的启动控制策略研究

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摘要

The starting-up control strategy is an important issue for voltage source convert-high voltage direct current (VSC-HVDC) system. If a VSC-HVDC system starts up without any auxiliary starting-up control strategy, the overcurrent will occur both in AC and in DC sides. Such overcurrent rises rapidly, and its value is several times as the normal operating current. It endangers the convert equipment seriously and may cause mal-operation of the overcurrent and differential under-voltage protection. A simple but effective starting-up control strategy is proposed. It consists of a current limiting resistance (Rin) and three improved controllers.Rinis supplemented into AC side of converter to suppress the overcurrent during uncontrolled rectifier stage, and the design method ofRinis performed in detail. Then, three improved controllers, including DC voltage slope controller, active power adaptive droop controller and reactive power deviation correction controller, are designed to restrain the overcurrent during controlled voltage stage. By introducing this starting-up control strategy, the overcurrent in the VSC-HVDC system is restrained effectively and the system can start up steadily. Substantial simulations conducted on PSCAD/EMTDC platform have demonstrated the outperformance of the proposed strategy in mitigating overcurrent in VSC-HVDC system.
机译：对于电压源转换高压直流（VSC-HVDC）系统，启动控制策略是一个重要的问题。如果VSC-HVDC系统在没有任何辅助启动控制策略的情况下启动，则过电流将同时出现在交流侧和直流侧。这种过电流迅速上升，其值是正常工作电流的几倍。它会严重危害转换设备，并可能导致过电流和差动欠压保护的误动作。提出了一种简单有效的启动控制策略。它由限流电阻（ n R n 中的 n）和三个改进的控制器。 n R n in nis，以抑制不受控制的整流器阶段的过电流，并且 n R n 详细执行。然后，设计了三种改进的控制器，包括直流电压斜率控制器，有功功率自适应下垂控制器和无功功率偏差校正控制器，以抑制受控电压阶段的过电流。通过引入这种启动控制策略，可以有效地抑制VSC-HVDC系统中的过电流，并且系统可以稳定启动。在PSCAD / EMTDC平台上进行的大量仿真表明，所提出的策略在缓解VSC-HVDC系统中的过电流方面表现出色。

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