Energy storage type power regulator for power distribution system, and power distribution system

Abstract

The invention discloses an energy storage type power regulator for a power distribution system, and the power distribution system. The energy storage type power regulator comprises a first duplex-winding self-coupled transformer, a second duplex-winding self-coupled transformer and an energy storage type chained power regulating unit; the energy storage type chained power regulating unit is composed of an energy storage type chained power regulating branch; the energy storage type chained power regulating branch is composed of a first single-phase full-bridge AC-DC convertor, a first bidirectional DC-DC convertor, an energy storage device, a second bidirectional DC-DC convertor and a second single-phase full-bridge DC-AC convertor, which are sequentially connected in series; the power distribution system comprises a power distribution transformer and a load; the energy storage type power regulator is connected between the A phase and the B phase of the low-voltage side of the power distribution transformer; and the energy storage type power regulator is connected between the B phase and the C phase of the low-voltage side of the power distribution transformer. By means of the energy storage type power regulator for the power distribution system, and the power distribution system disclosed by the invention, the three-phase current of the power distribution transformer can be balanced; the utilization rate of the transformer is increased; the reactive power of the load is dynamically compensated; the power factor of a power distribution network is increased; the active power of the load is rapidly compensated; and the power supply reliability of the load is improved.

Description

technical field [0001] The invention relates to a power system, in particular to an energy storage type power conditioner for a power distribution system and the power distribution system. Background technique [0002] At present, my country's power distribution AC system generally adopts a three-phase symmetrical power supply operation mode. However, the actual load supplied contains a large number of single-phase loads, and there is an unreasonable distribution of three-phase loads, which leads to the asymmetrical operation of the three-phase loads in the power distribution system, which will also cause a series of problems. For example, the utilization rate of the three-phase transformer is reduced, the power loss of the transformer and the power line is increased, and the unbalance of the three-phase voltage is caused, which affects the normal operation of the equipment. In addition, in order to improve the reliability of power supply, the general important users have a...

AI Technical Summary

Problems solved by technology

Among them, in the switching process of the main and standby power supplies, in order to avoid the inrush current, a certain delay time is generally set, which will have an adverse impact on the reliability of the user's power supply.

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