Reactive compensation-based power supply transformer area tail end low-voltage distributed management method

Abstract

The invention discloses a reactive compensation-based power supply transformer area tail end low-voltage distributed management method, which comprises the steps of detecting a voltage effective valueof an installation point by a reactive compensation device, detecting a voltage phase by utilizing a phase locking or Fourier transform algorithm, and giving a phase reference value of a reactive current; generating a PWM signal by the reactive compensation device, and driving an IGBT to emit capacitive current to a power grid so as to compensate voltage drop caused by line inductance and a reactive load; and setting a target voltage value, detecting a voltage effective value at a compensation point after reactive compensation, circularly comparing the compensated voltage and judging an adjustment direction, stopping adjusting the compensation current until the voltage reaches a relative steady state, and taking the current as steady-state output. According to the method, the reactive compensation device is connected in parallel, so that the reliability of a power grid is greatly improved, the possibility of power supply faults is reduced, the user voltage at the tail end of a line iseffectively increased, the front-end voltage is stabilized, and it is guaranteed that all users can normally use electricity within the rated capacity of a transformer area.

Description

technical field [0001] The invention relates to the field of power quality control, in particular to a distributed control method for low voltage at the end of a power supply station area based on reactive power compensation. Background technique [0002] The inside of the transformer and the low-voltage distribution lines are both resistive and inductive, so when the line flows through the current, a resistive-inductive voltage drop will be generated inside the transformer and the low-voltage distribution line; many household electrical appliances used by residents have motors inside, and there are relatively A large inductance will also produce a more obvious inductive reactive current. Therefore, in a general distribution network, the distribution system usually presents a resistive-inductive state. [0003] In many rural power grid areas, often due to the remote location of several users, the distribution lines will be extended for a long distance to connect to the user...

AI Technical Summary

Problems solved by technology

However, the series equipment is less reliable than the parallel equipment, and the boosting effect of this method is restricted by the characteristics of the line current and impedance.

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