| 引用本文: | 陈懿,刘涤尘,吴军,陈炜,王琪鑫,徐雨田,殷巧玲.异步联网送端系统紧急切机控制方法[J].电力自动化设备,2018,(8): |
| CHEN Yi,LIU Dichen,WU Jun,CHEN Wei,WANG Qixin,XU Yutian,YIN Qiaoling.Emergency generator tripping control method for sending end of asynchronous interconnection system[J].Electric Power Automation Equipment,2018,(8): |
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| 摘要: |
| 在异步联网运行方式下，送、受端系统间相互支援能力弱，因直流紧急降功率所导致的送端系统频率稳定问题不容忽视。在分析系统频率特性的基础上，提出了具有预测性的送端系统紧急切机控制方法。该方法将依据B样条拟合曲面预测得到的系统暂态频率最大偏差作为紧急控制启动判据，实现在系统功率出现不平衡的前期就能准确启动切机控制，避免系统进入紧急状态；根据功率平衡控制原理和预测所得的暂态频率最大偏差求出紧急控制所需切机量，并依据电气距离确定机组切除顺序。以实际暂态频率最大偏差、频率到达稳态时间以及直流频率限制控制器(FLC)恢复至额定状态的时间为指标，与系统采用高频切机控制进行对比。通过算例验证了所提方法的有效性。 |
| 关键词: 异步联网 直流调制 暂态频率最大偏差 紧急切机控制 |
| DOI：10.16081/j.issn.1006-6047.2018.08.019 |
| 分类号:TM712;TM761 |
| 基金项目:国家重点研发计划项目(2018YFB0904800) |
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| Emergency generator tripping control method for sending end of asynchronous interconnection system |
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CHEN Yi, LIU Dichen, WU Jun, CHEN Wei, WANG Qixin, XU Yutian, YIN Qiaoling
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School of Electrical Engineering, Wuhan University, Wuhan 430072, China
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| Abstract: |
| In the asynchronous interconnection operation mode, the mutual support capability between sending and receiving system is weak, and the frequency stability issues of sending system caused by the sudden DC power drop can not be ignored. On the basis of analyzing the frequency characteristics of the system, an emergency generator tripping control method with predictability is proposed for the sending system. The maximum deviation of transient frequency predicted by the B-spline surface fitting method is used as the emergency tripping control criterion, which can start the generator tripping control accurately in the early period of system power imbalance to avoid the system entering emergency state. The emergency generator tripping quantity is obtained based on the power balance control principle and the predicted maximum deviation of transient frequency, and the generator tripping sequence is determined according to the electrical distance. Taken the maximum deviation of actual transient frequency, the time of frequency reaching to steady state and the time of DC FLC(Frequency Limit Controller) returning to the rated state as the indicators, the proposed method is compared with high frequency generator tripping control. The effectiveness of the proposed method is verified by an example. |
| Key words: asynchronous interconnection HVDC modulation maximum deviation of transient frequency emergency generator tripping control |
