An intelligent energy-saving device and control method for a power distribution system

Abstract

The invention discloses an intelligent energy-saving device for a power distribution system and a control method thereof. The energy-saving device includes a rectification and inverter module, a parallel-side switch S1, a series-side switch S2, a series-side coupling transformer T1, and a coupling transformer bypass switch S3. And the main circuit bypass switch S4, the rectification and inverter module is connected to the outlet of the low voltage side of the main circuit transformer through the parallel side switch S1, and the rectification and inverter module is connected to the series side coupling transformer T1 through the series side switch S2, and connected in series The secondary side winding of the side coupling transformer T1 is connected in series with the main circuit load, the coupling transformer bypass switch S3 is connected in parallel with the series side coupling transformer T1, and the main circuit bypass switch S4 is connected in parallel between the distribution transformer and the main circuit load, and The main circuit switch and the secondary side winding of the coupling transformer T1 on the series side are connected in parallel. The control method includes four steps: initial inspection, normal startup, fault self-check and elimination, and normal shutdown.

Description

technical field [0001] The invention belongs to the technical field of circuit devices for an AC power distribution network, and in particular relates to an intelligent power-saving device for a power distribution system and a control method thereof. Background technique [0002] In recent years, with the promotion and use of various power electronic devices, the power quality problems of power distribution systems have become increasingly obvious, and the power loss caused by power quality is also increasing. Considering that electric energy consumption is an important component cost of enterprise production, it has become an important idea for enterprises to improve economic benefits by optimizing and managing the power quality problems of parks and enterprise power distribution systems to achieve energy saving. [0003] According to the literature search of the existing technology, it is found that the Chinese utility model patent (application number: CN201820760624.7) pr...

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Problems solved by technology

[0004] The structures proposed by power-saving devices in the existing literature generally have one or all of the following problems: (1) the proposed structure cannot support the comprehensive treatment of various power quality problems; (2) the proposed structure does not consider power-saving devices Or the protection problem when the main circuit where the load is located fails

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