Power supply harmonic wave compensation system and method for active power filter

Abstract

The invention discloses a power supply harmonic wave compensation system and method for an active power filter. The system comprises an ARM processor, a harmonic wave detection module, a harmonic wavecompensation module and a filter; the ARM processor is connected to the harmonic wave detection module and the harmonic wave compensation module separately; the filter is connected to an output end of a power grid and the ARM processor separately; the ARM processor is connected to a memory and an upper computer separately. The structure principle is simple, the voltage and current of a power source of the power grid can be compensated, and the filter performance of the active power filter is improved.

Description

technical field [0001] The invention relates to the technical field of power filters, in particular to an active power filter power supply harmonic compensation system and method. Background technique [0002] The main function of the active power filter is to compensate the harmonic current of the electric load. The current transformer installed on the load side detects the harmonic current of the load as an instruction to control the filter to output the reverse harmonic current, so that the grid side current has no harmonic. [0003] When designing an active power filter, in order to reduce the high-frequency ripple output by the filter itself, the LCL output filter method is generally used. Due to the introduction of capacitor filter C, a certain low-frequency capacitive reactance characteristic will appear at the grid access point. When the grid is loaded with voltage, it will lead to the inflow of reactive current, especially when the grid voltage has harmonic distort...

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Problems solved by technology

Due to the introduction of capacitor filter C, a certain low-frequency capacitive reactance characteristic will appear at the grid access point. When the grid is loaded with voltage, it will lead to the inflow of reactive current, especially when the grid voltage has harmonic distortion, it will introduce a certain Harmonic current, deepening the distortion of grid current

In most industrial sites at present, due to the heavy load, the site environment voltage distortion is also relatively serious, the active power filter can compensate the harmonic current of the load; that is, the power filter itself will also generate harmonics when filtering current, the existing technology cannot effectively compensate the introduced harmonic current, resulting in poor performance of the power filter

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