Electromagnetic type energy recovery harmonic suppression device

Abstract

The present invention provides an electromagnetic type energy recovery harmonic suppression device. The device comprises a current-type induction transformer, a serial capacitor unit, a harmonic rectification transformer, a bridge rectifier unit and an automatic grid-connected inverter. The primary side winding of the current-type induction transformer is connected in series with the serial capacitor unit and then is accessed into an alternating current distribution network major loop of three-phase alternating current or single phase, the secondary side winding output end of the current-type induction transformer is connected with the input end of the harmonic rectification transformer, the output end of the harmonic rectification transformer is connected with the alternating current input end of the bridge rectifier after the voltage regulation of the harmonic rectification transformer, the output end of the bridge rectifier is connected with the automatic grid-connected inverter after shaping of the output end of the bridge rectifier through a filter reactor and a filter capacitor, and the inverter is configured to convert the multi-time harmonic energy combined and captured by the current-type induction transformer to standard electric supply and then feed the standard electric supply with the same frequency and the same phase voltage into an alternating current distribution network.

Description

technical field [0001] The invention relates to an electromagnetic energy recovery type harmonic suppression device, which is mainly used for controlling harmonics in an AC power grid and belongs to the technical field of automatic control of power grids. Background technique [0002] In recent years, due to the rapid advancement of semiconductor technology, many power electronic components with good controllability and high voltage and high current resistance have been developed. These components have been widely used in power equipment, such as motors, drives, electric arc furnaces , trams, chargers and lighting appliances, etc. Due to the nonlinear input characteristics of these devices, they generate a large amount of harmonic current during use. The existence of harmonic currents will cause some problems, such as overheating of transformers, vibration of rotating machinery, distortion of supply voltage, damage of electrical components and functional failure of medical ...

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Problems solved by technology

[0008] Since the idea of ​​this method still uses the traditional idea of ​​canceling harmonics, the result is that the energy of harmonics is led to the transformer for consumption, which will cause new injected energy in the transformer, resulting in heat and affecting transformer operation

At the same time, since the wiring method of this patent is a large transformer that needs to increase the equivalent load capacity, it is essentially the function of a power-type isolation transformer, and its design capacity must be greater than the rated capacity of the load, which greatly increases the device. The cost and loss of the transformer, in the actual project, the investment amount may exceed the traditional passive or active harmonic suppression system, therefore, the application of this scheme is suitable for small power occasions, for large It is economically uneconomical and wasteful for capacity power users

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