| 引用本文: | 徐衍会,马 骢,邓小文,蔡 笋,张保会,李光辉,王 进,郝治国,张金华,黄仁谋,王小立.汽轮机阀门控制方式切换引发低频振荡的实例及其机理分析[J].电力自动化设备,2015,35(3): |
| XU Yanhui,MA Cong,DENG Xiaowen,CAI Sun,ZHANG Baohui,LI Guanghui,WANG Jin,HAO Zhiguo,ZHANG Jinhua,HUANG Renmou,WANG Xiaoli.Case of low-frequency oscillation induced by steam turbine valve control mode switchover and its mechanism analysis[J].Electric Power Automation Equipment,2015,35(3): |
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| 汽轮机阀门控制方式切换引发低频振荡的实例及其机理分析 |
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徐衍会1, 马 骢1, 邓小文2, 蔡 笋2, 张保会3, 李光辉3, 王 进3, 郝治国3, 张金华3, 黄仁谋4, 王小立3,5
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1.华北电力大学 电气与电子工程学院，北京 102206;2.广东电网公司电力科学研究院，广东 广州 510080;3.西安交通大学 电气工程学院，陕西 西安 710049;4.海南电网公司，海南 海口 570100;5.宁夏电力公司调度中心，宁夏 银川 750001
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| 摘要: |
| 电力系统中多次出现因汽轮机阀门控制方式切换引发的低频振荡现象。因此，分析了汽轮机阀门流量特性和控制方式，建立了考虑阀门流量特性的汽轮机控制系统模型。应用仿真软件PSCAD／EMTDC建立了机网耦合数字仿真平台，重现了南方电网某电厂汽轮机阀门控制方式切换引发的低频振荡现象。对低频振荡的机理分析结果表明，汽轮机单阀控制切换为顺序阀控制方式后，由于阀门流量特性修正函数与阀门实际流量特性偏差较大，会引起调节阀门的大幅值摆动，从而使汽轮机机械功率以0.171 Hz的频率做等幅值振荡，在该扰动源作用下电力系统出现强迫功率振荡。 |
| 关键词: 电力系统 低频振荡 阀门控制方式 流量特性 汽轮机 |
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| 基金项目:国家自然科学基金资助项目（51407069）；中央高校基本科研业务费专项资金资助项目（2014MS05） |
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| Case of low-frequency oscillation induced by steam turbine valve control mode switchover and its mechanism analysis |
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XU Yanhui1, MA Cong1, DENG Xiaowen2, CAI Sun2, ZHANG Baohui3, LI Guanghui3, WANG Jin3, HAO Zhiguo3, ZHANG Jinhua3, HUANG Renmou4, WANG Xiaoli3,5
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1.North China Electric Power University，Beijing 102206，China;2.Electric Power Research Institute of Guangdong Power Grid Corporation，Guangzhou 510080，China;3.School of Electrical Engineering，Xi’an Jiaotong University，Xi’an 710049，China;4.Hainan Power Grid Corporation，Haikou 570100，China;5.Dispatching Center of Ningxia Electric Power Company，Yinchuan 750001，China
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| Abstract: |
| Since the switchover of steam turbine valve control mode has induced the low -frequency oscillation of power system often，the flux characteristic and control mode of steam turbine valve are analyzed and a steam turbine control system model considering the valve flux characteristic is built. PSCAD／EMTDC software is applied to build a digital unit-network coupling simulation platform and the low-frequency oscillation phenomenon induced by the steam turbine valve control mode switchover in a power plant of South China Power Grid is simulated. The mechanism of low-frequency oscillation is analyzed and the results indicate that，the big difference between the actual valve flux characteristic and the flux compensation function will induce large-amplitude oscillation of governor valve after the single valve control mode is switched over to the sequential valve control mode，which causes the 0.171 Hz equal-amplitude oscillation of steam turbine mechanical power，resulting in the forced oscillation of power system. |
| Key words: electric power systems low-frequency oscillation valve control mode flux characteristic steam turbines |
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