Series resonance injection type hybrid filtering system

Abstract

The invention discloses a series resonance injection type hybrid filtering system, which comprises a power supply bus, a load connected with the power supply bus and a passive filtering part, the system further comprises an active filtering part, the active filtering part comprises an injection branch, a fundamental wave series resonance branch, a coupling transformer, an output filtering branch, an inter-harmonic filter and a controller, the inter-harmonic filter outputs inter-harmonic current and harmonic current through control of the controller, the inter-harmonic current and the harmonic current are transmitted to the coupling transformer through the output filtering branch, and the coupling transformer is connected with the injection branch. And the output end of the coupling transformer is connected in parallel with the fundamental wave series resonance branch and then connected with the power supply bus through the injection branch. The inter-harmonic filter is a voltage type inverter formed based on an IGBT power module and a PWM modulation technology. According to the invention, inter-harmonics and harmonics in the high-voltage power distribution system can be effectively filtered, the power utilization quality is improved, and the power grid safety is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of power transmission and distribution, in particular to a series resonance injection hybrid filter system. Background technique [0002] At present, in the process of power transmission and distribution, due to the use of excessive nonlinear equipment, a series of interharmonics appear in the power grid. These interharmonics pollute the power grid, reduce the quality of power energy, and cause some power equipment to fail. Safe, stable and efficient operation, so it is of great significance to the protection and research of power quality. Due to the complexity of the inter-harmonic frequency, and its amplitude is usually much smaller than the amplitude of the fundamental and harmonics, the current effective suppression of the inter-harmonic in the power transmission and distribution process is not satisfactory. Waves still cause certain harm to the transmission and use of electric power, and have adverse e...

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Problems solved by technology

[0002] At present, in the process of power transmission and distribution, due to the use of excessive nonlinear equipment, a series of interharmonics appear in the power grid. These interharmonics pollute the power grid, reduce the quality of power energy, and cause some power equipment to fail. Safe, stable and efficient operation, so it is of great significance to the protection and research of power quality

Due to the complexity of the inter-harmonic frequency, and its amplitude is usually much smaller than the amplitude of the fundamental and harmonics, the current effective suppression of the inter-harmonic in the power transmission and distribution process is not satisfactory. Waves still cause certain harm to the transmission and use of electric power, and have adverse effects on people's production and life.

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