大惯性电动机负荷运行特性对油田区域配电网电压暂降影响仿真分析

Simulation Analysis on the Influence of Load Operation Characteristics of Large-Inertia Electromotor on Voltage Sag of Distribution Network in Oilfield Area

油田配电网是保障供电可靠性与提高运行经济性的关键环节,电压暂降是表征供能质量的重要指标,油田配电网由电压暂降引起的电能质量问题日益突出,严重影响油田产量。油田典型用电负荷抽油机具有惯性大、周期运行等特点,电压暂降后会产生较大的反电动势,给电压暂降治理造成一定的难度。为了分析大惯性电动机负荷对电压暂降传播过程中的影响,将理论分析与电磁暂态仿真验证相结合,建立油田区域配电网简化拓扑图,对大惯性电动机负荷在电压暂降传播过程中的影响进行机理分析,利用电磁暂态仿真软件PSCAD进行仿真,验证了理论分析的正确性。

Oil field distribution network is the key link to guarantee the reliability of power supply and improve the operating economy.Voltage sag is an important indicator to characterize the quality of energy supply.Power quality problems caused by voltage sag in oil field distribution network are increasingly prominent,which seriously affects oil field output.The pumping unit as a typical electricity load in oil field has the characteristics of large inertia,periodic operation,etc.and the voltage sag will produce a large back electromotive force,which makes it difficult to control the voltage sag.In order to analyze the influence of of large-inertia electromotor load on voltage sag propagation process,this paper combines theoretical analysis with electromagnetic transient simulation verification to establish a simplified topology diagram of regional distribution network in oil field,and analyze the influence mechanism of large-inertia electromotor load in the transmission process of voltage sag.Finally,the paper makes simulation by use of the electromagnetic transient simulation software PSCAD,with the correctness of the theoretical analysis verified.