Method for comprehensively improving power quality

Abstract

The invention discloses a method for comprehensively improving power quality. According to the method, a phase-change switch switching module and a VSC adjusting module are integrated; the method gives full play to the technical advantages of the phase-change switch and the VSC, achieves the purposes of advantage complementation and coordinated operation, and can solve various types of steady-state power quality problems of three-phase unbalanced current, harmonic current, reactive current, voltage deviation and the like of a low-voltage transformer area of a distribution network.

Description

technical field [0001] The invention relates to a method for comprehensively improving power quality, which can be used to control problems such as low voltage, harmonics, and three-phase imbalance in a low-voltage station area of ​​a distribution network. Background technique [0002] Nowadays, the scale, line length, and 400V / 220V low-voltage lines of my country's rural low-voltage distribution network are in zero-distance contact with the majority of users. With the development of the rural economy and the development of the policy of sending home appliances to the countryside, various high-power household appliances appear in the homes of farmers, and the electricity consumption in rural areas increases rapidly. The following operating conditions often occur in rural distribution areas: the agricultural production and mobility of rural migrant workers cause large load fluctuations in rural power grids; the terminal voltage far away from the substation and heavy load is l...

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Problems solved by technology

[0004] With the emergence of the above-mentioned operating conditions, the low-voltage distribution network has problems such as low power factor, unbalanced three-phase, unqualified voltage, and harmonics, which affect the quality of power supply.

At present, the general power management method has a single function, poor adjustment accuracy, can not solve the power quality problem, and affects the safety of the equipment. They all use low-voltage active power filters to control harmonics and low-voltage static var generators alone. Reactive power compensation, using low voltage control devices to control low voltage, lacks a comprehensive method that can control harmonics, low power factor, three-phase unbalance and low voltage to comprehensively improve power quality

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