無(wú)功規(guī)劃及其在功率管理中的運(yùn)行畢業(yè)論文外文翻譯(編輯修改稿)
2025-06-26 00:57 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 MW loss and voltage dip. Reactive power itself is sort of energy swapping between reactive element and capacitive element and is not consumed for pure reactive and capacitive elements. If most of reactive power load can be supplied at load sites, the amount of reactive power flow in either transmission work or distribution work can be reduced. Fig. 1 is a 12bus sample system which is a small piece of distribution work of New York City. The loads and shunt pensations show n in the figure are three phase total. Balanced threephase load is assumed in the calculation. Four pensation cases are presented to illustrate the effects on MW loss and voltage dip. All four cases are under same load conditions as show n in Fig. 1 except that the reactive power pensations are different: Case 1 : Without reactive power pensation. Case 2: Reactive power pensations are shown in Fig. 1. Case 3: Total reactive power pensation of case 2(1380 KVAR) is made at Bus 1 Case4: Reactive power pensation at Bus 1 is increased to obtain unity power factor. Similar situation can be found from bus voltages. Compensation method of case 2 is most effective in voltage improvement among those cases. Case 3 and case 4 have no direct effects on bus voltages of distribution work. Ⅲ .REACTIVE POWER COMPENSATION IN TRANSMISSION NETWORK For normal operation the pensation should be sufficient to keep the voltages of feeders within an acceptable range. For emergency operation the pensation should be able to keep the voltages within a wider acceptable range with the reactive power support from generation panies. Fig. 2 is a small system of 110 buses, 136 branches including 71 transformers and 33 generators. System load is about 400 MW. Individual bus loads are not show n in the figure. The first case is base case. In the base case power factors of generators are not necessary the same and, similarly, power factors of load buses are not necessary the same either. In the second case, load conditions are the same as base case, including 3 shu
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