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ABB:6008BZ10000E
ABB:6008BZ10000E
ABB:6008BZ10000E
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最后更新:2018-09-05 16:01
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經(jīng)濟(jì)運(yùn)行方式要考慮到負(fù)載波動(dòng)。因此,對(duì)工況負(fù)載分配系數(shù)計(jì)算要按動(dòng)態(tài)計(jì)算式進(jìn)行計(jì)算
負(fù)載波動(dòng)損耗系數(shù)KT值可在GB/T13462—92國(guó)家標(biāo)準(zhǔn)中查找。
對(duì)經(jīng)濟(jì)運(yùn)行方式判定時(shí),要用動(dòng)態(tài)負(fù)載分配系數(shù)DTA對(duì)DLPA、DLQA、DLZA進(jìn)行對(duì)比。
23個(gè)變(配)電所電網(wǎng)經(jīng)濟(jì)運(yùn)行方式節(jié)約功率
設(shè)電源乙供變電所C的負(fù)載SC為經(jīng)濟(jì)運(yùn)行方式,則用式(3)的ΔP甲C減去式(4)的ΔP乙C,并考慮負(fù)載波動(dòng)損失時(shí)。
同理也可導(dǎo)出電源乙供變電所C比電源甲供時(shí)的無(wú)功功率節(jié)約ΔΔQ(kvar)計(jì)算式
例1某35kV兩端網(wǎng)絡(luò),有松(A)、南(B)、興(C)三個(gè)變電所和雙(甲)、永(乙)兩個(gè)電源,開(kāi)式運(yùn)行。線路參數(shù)和變電所負(fù)載。現(xiàn)運(yùn)行方式是變電所松、興由電源雙站供電,變電所南由電源永站供電。
首先判定現(xiàn)運(yùn)行方式是否經(jīng)濟(jì)運(yùn)行,并計(jì)算經(jīng)濟(jì)運(yùn)行方式的節(jié)電效果。
解:各變電所負(fù)載視在功率
根據(jù)式(1)分別計(jì)算出各變電所的負(fù)載分配系數(shù)
DA=0.33;DB=0.67;DC=0.30
然后,計(jì)算有功臨界負(fù)載分配系數(shù)DLPA
同理可計(jì)算出無(wú)功臨界負(fù)載分配系數(shù)DLQA
計(jì)算出工況負(fù)載分配系數(shù)DTA
由于本例的DTA(0.335)DLPA(0.067)和DTA(0.335)DLQA(0.142),所以按有功經(jīng)濟(jì)運(yùn)行和無(wú)功經(jīng)濟(jì)運(yùn)行判定現(xiàn)運(yùn)行方式都不是經(jīng)濟(jì)運(yùn)行方式,應(yīng)改為變電所興由電源永站供電。
由此可見(jiàn),不用花投資,充分利用現(xiàn)有的電力線路,僅改變運(yùn)行方式就能取得顯著的節(jié)電效果。節(jié)約有功功率39.18kW,比原運(yùn)行方式的線路有功功率損失(63.05kW)下降62%;節(jié)約無(wú)功功率38.09kvar,比原運(yùn)行方式的線路無(wú)功功率消耗(80.54kvar)下降47%。
3多個(gè)變(配)電所電網(wǎng)經(jīng)濟(jì)運(yùn)行方式的判定
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