Method for improving motor performance through series capacitor compensation in power distribution network

Abstract

The invention provides a method for improving the motor performance through series capacitor compensation in a power distribution network. The method aims at solving the problems that due to the fact that power supply circuits of oil fields and coal mines are frequently provided with multiple large-capacity induction motors and rapidly-changed impacting loads, the voltages at the tail ends of the circuits are frequently and excessively low and large in fluctuation, and the motor performance is influenced. The basic principle is that three-phase series compensation capacitors are installed on power wire inlet sides of the motors according to a certain principle, the voltages across the two ends of the capacitors are different when different currents flow through the series compensation capacitors, the capacitive voltages are overlaid to the motor ends, voltage adjustment compensation can be accordingly and automatically carried out on the motors according to changes of the loads, the voltage adjustment requirements that boosting is high when the loads are large and boosting is small when the loads are small are met, circuit parameters and the starting performance and the operation performance of the motors are improved, the voltage fluctuation is eliminated, and meanwhile energy can be saved.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a method for improving motor performance by adopting series capacitor compensation in a distribution network. Background technique [0002] With the continuous development and expansion of the power system, the power supply lines of some oil fields and coal mines are often connected to the 6kV or 10kV busbars of municipal or rural substations nearby. As oil wells and mines are far away from step-down substations, the extension length and power transmission power of distribution lines are also increasing accordingly. The number of distribution transformers is large, the power supply radius is large, and many lines have multiple large-capacity induction motors or Rapidly changing impact loads often lead to low voltage at the end of the line and large fluctuations. At the same time, the application of a large number of sophisticated electronic equipment for distribution netw...

AI Technical Summary

Problems solved by technology

Among them, the disadvantage of changing the transformer tap is that the adjustment range is small; the disadvantage of replacing large-diameter wires is that the cost is high; the disadvantage of using a distributed parallel reactive power compensation device is that the number of parallel reactive power compensation devices required Causes the problem of low voltage at heavy load and high voltage at light load

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