Inverter, power generation system, and method for suppressing harmonic distortion of alternating current (AC) system

Abstract

The application provides an inverter, a power generation system, and a method for suppressing harmonic distortion of an alternating current (AC) system. The inverter comprises an inverter circuit, anAC filter, an AC electromagnetic interference (EMI) filter and a first AC switch, wherein an input port of the AC filter is connected to an output port of the inverter circuit; the first AC switch isconnected between an output port of the AC filter and an input port of the AC EMI filter, wherein the AC filter comprises a first split capacitor, the first split capacitor is arranged between the first AC switch and the input port of the AC EMI filter, when the first AC switch is in a turn-off state, the connection between the first split capacitor and the output port of the AC filter is disconnected, and the first split capacitor is connected to a loop where the AC system connected to the output port of the AC filter is located to suppress the harmonic distortion of the AC system. The embodiment of the application can suppress the harmonic distortion of the AC system.

Description

technical field [0001] The present application relates to the field of electric power technology, and more specifically, relates to an inverter, a power generation system and a method for suppressing harmonic distortion of an AC system. Background technique [0002] The inverter is generally connected between the DC system and the grid, and is a device that converts DC power into AC power. The inverter is mainly composed of an inverter circuit, an AC filter, an AC switch and an AC electromagnetic interference (Electro Magnetic Interference, EMI) filter. Wherein, the inverter circuit is used to convert the direct current into alternating current, and the alternating current filter and the alternating current EMI filter are used for filtering the alternating current generated by the inverter current, and outputting the filtered alternating current to the power grid. [0003] There are generally differential mode and common mode filter capacitors in the AC EMI filter with a ty...

AI Technical Summary

Problems solved by technology

When the resonant circuit overlaps with the harmonic voltage frequency band in the power grid, the harmonic voltage will be severely amplified, and the voltage distortion caused by resonance will further deteriorate the control stability of the inverter and affect the performance of the inverter.

[0004] In order to weaken or suppress system resonance, traditional solutions often use the method of adding electrical components to suppress the resonance (or harmonic distortion) caused by the inverter, but adding components will not only increase hardware costs, but also It will affect the reliability of the whole system, and the actual application effect is not good

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