Medium-voltage power supply quality comprehensive adjusting system

Abstract

The invention belongs to the field of power transmission and distribution of a power system, and particularly discloses a medium-voltage power supply quality comprehensive adjustment system. The system comprises a bypass module, a current limiting module, a grid-connected reactor module and a power unit cascade module, and solves the problem of medium-voltage high-sensitivity load power supply quality, wherein the current limiting module is connected with an input port and an output port of the medium-voltage power supply quality comprehensive adjustment system, suppresses harmonic componentsof an alternating-current power supply when the alternating-current power supply operates normally, and limits alternating current when the alternating-current power supply fails; the bypass module isconnected with the current limiting module in parallel and used for providing a low-impedance current circulation branch between the alternating-current power supply and the load so as to promote thealternating-current power supply to directly supply power to the load; the power unit cascade module is connected to an output port of the medium-voltage power supply quality comprehensive adjustmentsystem through a grid-connected reactor and used for adjusting the electric energy quality and the active power of a load when an alternating-current power supply operates normally and outputting alternating-current voltage meeting the load requirement when the alternating-current power supply breaks down, so that the load voltage is kept uninterrupted.

Description

technical field [0001] The invention belongs to the technical field of power transmission and distribution in electric power systems, and more specifically relates to a comprehensive adjustment system for medium-voltage power supply quality. Background technique [0002] In recent years, various power supply quality problems represented by voltage sags, short-time interruptions, and harmonics have caused economic losses and adverse effects on highly sensitive enterprises (microelectronics, semiconductors, data centers, etc.) have become increasingly prominent. How to meet the needs of improving the quality of power supply for sensitive loads is very urgent and necessary. At present, the existing power supply quality improvement solutions are mainly solved from two levels of low voltage and medium voltage. At the low-voltage level, the capacity of a single existing low-voltage power supply quality improvement device is generally between 50kVA and 200kVA. Although multiple un...

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Problems solved by technology

[0004] The invention provides a medium-voltage power supply quality comprehensive adjustment system, which is used to solve the technical problem that the existing system devices used in improving the power supply quality of the medium-voltage three-phase AC system cannot effectively deal with various power supply quality events, resulting in limited application

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