無功規(guī)劃及其在功率管理中的運行畢業(yè)論文外文翻譯-在線瀏覽
2024-07-24 00:57本頁面
【正文】 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 shunt pensations, but with the generators operating near unity power factor. The last four cases, generators are operating near unity power factor and the power factor of all load buses is assumed , , and , respectively. Ⅳ .REACTIVE POWER RESREVE OF GENERATORS The proposed reactive power management scheme assumes that generators are not responsible for reactive power supply under normal operation conditions. The generators, however, have to have sufficient reactive power reserve for contingencies. An important issue is how much reserve is necessary for each generator since reactive power capacity directly affects generator price. Properties of contingency, location of power plant and criteria of voltage quality all affect the required amount of reactive power reserve for the generators. For the interconnected system, the strength of tie lines and neighboring systems also play an essential role. It is different from the estimation of real power spinning reserve,
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