Researches on DC modulation to damp low frequency oscillation in China Southern Power Grid

Chen He, Huang He, Zhang Yong, Su Yinsheng
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引用次数: 5

Abstract

For China Southern Power Grid (CSG), which has the feature of long distance power transmission with strong DC system and weak AC interconnection, low-frequency oscillation is more serious than before for specific operating situations. Therefore, using DC modulation technique to suppress inter-area low-frequency oscillation becomes a very important topic. This paper investigates low-frequency oscillation problem of CSG, and carries out system modal analyses to find out dominant inter-area oscillation modes, and then applies HVDC modulation to damping system oscillations. Gain optimization of modulation controllers of Yunnan-Guangdong DC systems is carried out to improve system damping performance. Simulations with and without modulation controllers are performed in frequency-domain and time-domain to verify the effectiveness of controllers.
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南方电网直流调制抑制低频振荡的研究
南方电网具有强直流系统、弱交流互联的远距离输电特点,在特定运行工况下,低频振荡较以往更为严重。因此,利用直流调制技术抑制区域间低频振荡成为一个非常重要的课题。本文研究了CSG的低频振荡问题,通过系统模态分析找出区域间振荡的主导模态,然后采用高压直流调制来抑制系统振荡。对云广直流系统的调制控制器进行增益优化,以提高系统的阻尼性能。分别在频域和时域进行了带调制控制器和不带调制控制器的仿真,验证了控制器的有效性。
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