Three-phase load unbalance control method for low-voltage transformer area

Abstract

The invention discloses a low-voltage transformer area three-phase load imbalance control method, which comprises the following steps of: setting the number and installation positions of phase-change switches of a low-voltage transformer area based on similarity, design load and real-time load; and when the low-voltage transformer area runs, periodically executing a three-phase load imbalance commutation strategy. According to the three-phase load imbalance control method for the low-voltage transformer area, the similarity, the design load and the real-time load are comprehensively considered, the actual load can be randomly increased for resident electric power and overload of a distribution line, transformer area optimization can be carried out, correction is carried out through a real-time commutation strategy, and the reliability of the transformer area is improved. And the problem of uneven load distribution caused by three-phase imbalance can be effectively solved.

Description

technical field [0001] The invention relates to the field of unbalanced control of three-phase loads in a power grid, in particular to a method for unbalanced control of three-phase loads in a low-voltage station area. Background technique [0002] In order to maintain the stable operation of the three-phase AC power system, three-phase load balance is one of the key indicators. The electricity load in the low-voltage station area is generally single-phase connected, and there are a large number of situations that are not properly planned, resulting in disorder in the number of connected users and phase sequence, that is, the number of users connected to the three-phase and the load are unbalanced, and the operation When the three-phase actual load is unbalanced. [0003] In the existing methods of controlling three-phase unbalance, due to the diversity of methods, the installed equipment will also change accordingly, so the investment in compensation devices will not only ...

AI Technical Summary

Problems solved by technology

The existing method is to balance the three-phase load at the low-voltage outlet of the distribution transformer by outputting compensation current, and the fundamental problem of the three-phase unbalanced phenomenon lies in the uneven distribution of the three-phase load, so this method cannot solve the three-phase imbalance at the root. Balanced load uneven distribution problem

In addition, the existing scheme considers the installation quantity and position of the commutation switch and the commutation adjustment strategy separately, and there is a lack of cooperation between the three, which cannot better achieve the purpose of phase modulation

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