作　　者： ; ; ;

机构地区： 直流输电技术国家重点实验室南方电网科学研究院有限责任公司广东省广州市510080

出　　处： 《电力系统自动化》 2018年第14期139-144,共6页

摘　　要： 以中国南方电网鲁西背靠背异步联网的柔性直流输电工程为背景,介绍了2017年4月10日在鲁西站广西侧发生高频谐波谐振的事件情况,对事件中谐波放大机制及其影响的关键环节进行了详细分析和仿真验证,得到了高频谐波谐振现象与柔性直流电网电压前馈控制采样环节、系统谐波阻抗之间的关系,推导了电压前馈控制参数、系统谐波阻抗与高频谐波谐振频率幅值之间的公式,并提出了在电压前馈环节合理设计滤波器来解决高频谐波谐振问题的措施,经仿真验证和现场实施验证了所提解决方案的有效性。 The basic situation of high-order harmonics is introduced in Luxi station on the side of Guangxi on April 10,2017,which is based on the background of voltage source converter based high voltage direct current（VSC-HVDC）project for backto-back asynchronous connection of Luxi station in China southern power grid.The key parts in the harmonics magnification mechanism and effects are analyzed in detail and simulated,which obtains the relationship among the high-order harmonics phenomenon,the sample part of forward control loop of VSC-HVDC grid voltage and the system harmonic impedance.Moreover,the function among the parameters of voltage feedforward control,the harmonic impedance of the system,the harmonic frequency and amplitude is derived.Then,the measures of designing reasonable filter to avoid the high-order harmonics in voltage feedforward control loop are proposed.Through the simulation and field test,the effectivity of the proposed method is verified.

关 键 词： 柔性直流 高频谐振 电压前馈 延时

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