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中文摘要：
基于不完全微分PID控制原理设计了一种高压直流（HVDC）输电系统附加频率控制器，采用容易获得、稳定可靠、对频率稳定有很好的控制效果的直流双侧频率作为输入信号。该控制器可根据频率变化调节HVDC功率指令，当系统发生故障而导致频率上升或下降至动作频率时，HVDC将增加或减少从另一端系统吸收或输送的有功功率，来快速化解故障端系统的有功过剩或缺额情况。针对该控制器，利用PSCAD／EMTDC在两区域系统中进行了时域仿真分析，证明了所设计控制器的有效性。
英文摘要：
A high voltage direct current （HVDC） transmission system additional frequency controller is designed based on incomplete differential PID control principle, which uses the DC bilateral frequency to be the input signal, with the advantage of being easy to access, stable, reliable and good control effect. The controller can adjust HVDC power instructions according to the frequency changes. When a fault occurs and causes the system frequency to rise or fall to action frequency, HVDC will increase or decrease power from another side of the system to make the frequency stable. The time-domain simulation by PSCAD/EMTDC verifies the effectiveness of the controller. This work is supported by National Natural Science Foundation of China（No. 51037003 and No. 50877050）.
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