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    Suzhou Electric Appliance Research Institute
    期刊號: CN32-1800/TM| ISSN1007-3175

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    交直流電力系統(tǒng)短路計算方法討論

    來源:電工電氣發(fā)布時間:2022-01-20 14:20 瀏覽次數(shù):431

    交直流電力系統(tǒng)短路計算方法討論

    董哲,何煒
    (廣東工業(yè)大學(xué) 自動化學(xué)院,廣東 廣州 510006)
     
        摘 要:PSASP 和 BPA 是國內(nèi)使用十分普遍的兩種短路計算程序,即使采用相同的計算模式和計算條件,兩種程序的計算結(jié)果也可能存在差異。通過理論分析和仿真計算對產(chǎn)生差異的原因進(jìn)行解析,著重討論交直流系統(tǒng)短路電流有效值、短路容量、短路比及有效短路比的恰當(dāng)計算方法。建議基于潮流計算短路電流時,把直流功率對應(yīng)的等值阻抗計入短路計算所用節(jié)點(diǎn)阻抗矩陣中;計算短路比和有效短路比指標(biāo)時,采用基于網(wǎng)絡(luò)模式下、換流母線電壓為 1.0 p.u. 時戴維南等值法的短路容量計算結(jié)果。以不同規(guī)模的交直流系統(tǒng)為算例,對所提提議的有效性進(jìn)行分析,有助于完善電力系統(tǒng)短路計算理論的應(yīng)用。
        關(guān)鍵詞:交直流電力系統(tǒng);基于潮流的短路計算;基于網(wǎng)絡(luò)的短路計算;戴維南等值法;疊加法
        中圖分類號:TM713     文獻(xiàn)標(biāo)識碼:A     文章編號:1007-3175(2022)01-0008-06
     
    Discussion on Short-Circuit Computing Methods for AC/DC Power System
     
    DONG Zhe, HE Wei
    (School of Automation, Guangdong University of Technology, Guangzhou 510006, China)
     
        Abstract: PSASP and BPA are the commonly used short-circuit calculation programs in China. Even under the same calculation modes and calculation conditions, their computed results could be different. This article analyzed the reasons for this difference by using theoretical analysis and simulation calculations. It focused on the effective value, short-circuit capacity, short-circuits ratio, and effectively short-circuit ratio of the proper computing methods for the short-circuit current in the AC/DC power system. This paper gives two suggestions: when calculating the short-circuit current based on the power flow, the equivalent impedance corresponding to the DC power could be included in the node impedance matrix used in the short-circuit calculation. When calculating the short-circuit ratio and effectively short-circuit ratio indicators.It might be better to use the short-circuit capacity calculation result which was figured out by using the Thevenin equivalent method based on the network-based mode when the converter bus voltage is 1.0 p.u. . The result of this study could help to improve the application of short-circuit calculation theory in power systems.
        Key words: AC/DC power system; power-flow based short-circuit calculation; network-based short-circuit calculation; Thevenin equivalent method; superposition method
     
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