| 基于综合负荷模型的感应电动机不稳定平衡点计算方法 |
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| 引用本文：张文朝1,潘晓杰2,薛峰3,李锴2,袁晓玲3,唐飞4.基于综合负荷模型的感应电动机不稳定平衡点计算方法[J].电网与清洁能源,2018,34(12):14~19 |
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| 基金项目:基金项目：国家自然科学基金项目（51507116） |
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| 中文摘要:正确认识电压失稳机理是进一步研究电力系统电压稳定问题的关键。建立了包含线路传输电抗、感应电动机、恒阻抗负荷以及无功补偿装置的实际电网综合负荷模型，提出了一种将实际电网部分电路等效为虚拟感应电动机的方法，并基于该方法以及戴维南定理构建了故障前、后虚拟感应电动机电磁转矩公式，进一步求解了感应电动机故障后不稳定滑差。该方法避开了传统方法求解感应电动机故障后不稳定滑差过程中遇到的系统故障切除后，感应电动机暂态过程中端电压不恒定的问题，使求解结果更加精确。利用该方法进一步分析了感应电动机负荷比例以及线路传输电抗对感应电动机故障后不稳定滑差的影响。利用PSD-BPA搭建的单机无穷大系统验证了所提方法的有效性。 |
| 中文关键词:电压稳定 虚拟感应电动机 戴维南定理 故障后不稳定滑差 负荷比例 传输电抗 |
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| Calculation Method of Unstable Equilibrium Point of Induction Motors Based on Synthesis Load Model |
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| Abstract:A correct understanding of the voltage instability mechanism is the key for further studies on the voltage stability in power system. This paper establishes a synthesis load model of an actual power grid containing line transmission reactance， induction motor， constant impedance load and reactive power compensation device. A method is proposed to make the real circuit of the grid equivalent to a virtual induction motor. Based on this method and the Thevenin's theorem， the electromagnetic torque formula of the virtual induction motor is established， and the unstable slip of the induction motor is solved. The method avoids dealing with the transient voltage instability of induction motors after removing system failures while solving the unstable slip of the induction motor after failure， which makes the results more accurate. The influence of the load ratio of the induction motor and the effect of the line transmission reactance on the unstable slip of the induction motor are analyzed. The simulation results prove effectiveness of the proposed method. |
| keywords:voltage stability virtual induction motor Thevenin’s theorem unstable slip after failure load ratio line transmission reactance |
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