配电网合环冲击电流计算方法及其简化计算公式

发布时间：2019-03-06 09:03

【摘要】：配电网合环操作可能产生较大的冲击电流,影响电网的安全稳定运行。为此提出一种配电网合环冲击电流计算方法,并推导了较准确的非合环支路冲击电流解析计算公式。基于最佳频率下合环前后的潮流和戴维南定理,计算合环冲击电流衰减时间常数;基于额定频率下合环前后的潮流结果和最佳频率法计算获得的衰减时间常数,计算合环冲击电流及非合环支路电流。最后,对不同方法(包括PSCAD/EMTDC暂态仿真)计算冲击电流的结果进行比较分析,验证了所提方法的实用性和有效性。算例结果同时表明某些非合环支路的冲击电流比合环支路冲击电流要大,表明非合环支路冲击电流简化计算公式及其计算校验是非常必要的。
[Abstract]:The closed loop operation of distribution network may produce a large impact current, which will affect the safe and stable operation of the power network. In this paper, a method for calculating the closed-loop impulse current of distribution network is proposed, and an accurate analytical formula for calculating the impact current of the non-closed-loop branch is derived. Based on the tidal current before and after closing the loop at the optimal frequency and Thevenin's theorem, the time constant of the shock current attenuation of the closing loop is calculated. Based on the tidal current before and after the loop closing at rated frequency and the attenuation time constant calculated by the optimal frequency method, the impact current and the branch current of the closed loop are calculated. Finally, the results of different methods (including PSCAD/EMTDC transient simulation) are compared and analyzed to verify the practicability and effectiveness of the proposed method. The numerical results also show that the impact current of some non-closed-loop branches is larger than that of the combined-loop branches. It is shown that the simplified formula for calculating the impact current of the non-closed-loop branch and its calculation verification are very necessary.
【作者单位】：输配电装备及系统安全与新技术国家重点实验室(重庆大学);贵阳供电局;
【分类号】：TM744

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