Multi-target power quality comprehensive treatment device used for medium voltage distribution network

Abstract

The invention discloses a multi-target power quality comprehensive treatment device used for a medium voltage distribution network. The multi-target power quality comprehensive treatment device comprises a three-phase parallel transformer and three single-phase series transformers and three single-phase energy storage conversion units corresponding to each phase in A phase, B phase and C phase; each single-phase energy storage conversion unit comprises 2n first units and n second units; each first unit comprises a single-phase full-bridge AC-DC converter, a power supply side bidirectional DC-DC converter, an energy storage device and a load side bidirectional DC-DC converter which are connected in sequence; and each second unit comprises a three-phase six-bridge arm DC-AC converter. The multi-target power quality comprehensive treatment device is mainly used for the medium voltage distribution network of medium (10 kV or 35 kV) voltage level, the load side harmonic current can be inhibited, the three-phase current of a distribution transformer is balanced, the utilization rate of the transformer is improved, the reactive power of the load is compensated dynamically, the power factor of the distribution network is improved, the active power of the load is compensated quickly, and the effects, such as stability and reliability, for user power supply voltage are improved.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a multi-objective power quality comprehensive treatment device for medium-voltage distribution networks. Background technique [0002] As a secondary energy source that is economical, practical, clean, convenient, and easy to control and convert, electric energy has become an important basis for economic development and people's lives. With the wide application of power electronic equipment, various non-linear, impulsive, fluctuating and asymmetrical loads have increased substantially, resulting in problems such as unbalanced three-phase voltage, voltage sag, harmonics, low power factor, negative sequence Power quality problems such as high current content. At the same time, due to the large variation range of the distribution network load, it is difficult to adjust the distribution network voltage, and the power supply voltage is high or low, and even the voltage exceeds ...

AI Technical Summary

Problems solved by technology

However, when multiple power quality problems coexist in a power supply area, multiple different target control devices need to be used together. At present, due to the lack of coordination between multiple devices, it may cause repeated compensation for some power quality problems. Or interact with each other, so that the governance of power quality cannot achieve the desired effect

In addition, there may be repeated installation of power quality control devices with similar functions, resulting in waste of control funds

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