计及负载率的农村10kV配电网最优分段研究

Research on optimal sectioning of 10 kV rural power network considering load rate

在过去对配电线路分段的研究中,大多没有考虑线路的转供能力,认为只要通过分段开关将故障段分离,非故障段的全部负荷可经联络线恢复供电。而在实际运行中,配电网发生故障需要通过联络线转移负荷时,由于线路自身负载率的限制,联络线的转供率通常达不到100%,将出现停电损失。探讨不同负载率下手拉手自环网线路的最优分段情况,提出并建立了线路计及负载率最优分段的可靠性、经济性评估数学模型,利用模型计算分析了不同负载率下线路的最优分段位置及其变化规律。并基于最优分段位置,通过分段数-年总费用曲线法分析得到该接线模式下最优分段数与供电半径、产电比和负载率的关系,为电网建设中最优分段的选择提供有实用价值的参考和借鉴。

In most research on optimal sectioning of the 10 kV rural distribution network, the load transfer rate of lines is usually not considered. They just think that as long as the faulty section is separated by the section switch, the electricity of non-faulty section can be restored through the tie lines. While in practice, when distribution network breaks down, the failure load is transferred by tie line. Due to its own load rate, the non-faulty line cannot afford the whole failure load, the outage cost appears. This paper probes the optimal sectioning of hand in hand self-looped connecting mode under different load rates. This paper propounds and builds a reliability and economy evaluation mathematical model considering load rate. Using the model, it calculates and analyzes the changing law of the optimal location of sectional switches with load rate increasing. Then based on the optimal location result, by plotting the section numbers-total cost profile, the paper gets the relationships among the optimal section numbers, power supply radius, electricity production ratio and load rate, providing a meaningful reference to the choice of optimal sectioning in grid building.