配電網(wǎng)合環(huán)沖擊電流計算方法及其簡化計算公式
發(fā)布時間：2019-03-06 09:03
【摘要】：配電網(wǎng)合環(huán)操作可能產(chǎn)生較大的沖擊電流,影響電網(wǎng)的安全穩(wěn)定運行。為此提出一種配電網(wǎng)合環(huán)沖擊電流計算方法,并推導了較準確的非合環(huán)支路沖擊電流解析計算公式。基于最佳頻率下合環(huán)前后的潮流和戴維南定理,計算合環(huán)沖擊電流衰減時間常數(shù);基于額定頻率下合環(huán)前后的潮流結果和最佳頻率法計算獲得的衰減時間常數(shù),計算合環(huán)沖擊電流及非合環(huán)支路電流。最后,對不同方法(包括PSCAD/EMTDC暫態(tài)仿真)計算沖擊電流的結果進行比較分析,驗證了所提方法的實用性和有效性。算例結果同時表明某些非合環(huán)支路的沖擊電流比合環(huán)支路沖擊電流要大,表明非合環(huán)支路沖擊電流簡化計算公式及其計算校驗是非常必要的。
[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.
【作者單位】： 輸配電裝備及系統(tǒng)安全與新技術國家重點實驗室(重慶大學);貴陽供電局;
【分類號】：TM744
[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.
【作者單位】： 輸配電裝備及系統(tǒng)安全與新技術國家重點實驗室(重慶大學);貴陽供電局;
【分類號】：TM744
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