Harmonic current suppression method of single phase inverter

A single-phase inverter and harmonic current technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problems of slow dynamic response and long delay time, etc. Achieve high output current quality, high stability margin, and realize the effect of decoupling control

Active Publication Date: 2018-07-27
HEFEI WIN POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When adding a repetitive controller in the static coordinate system, the fundamental wave of the repetitive controller needs to be set to 50Hz, and the delay time is 0.02s. The delay time is long and the dynamic response speed is too slow.

Method used

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  • Harmonic current suppression method of single phase inverter
  • Harmonic current suppression method of single phase inverter
  • Harmonic current suppression method of single phase inverter

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Embodiment Construction

[0024] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] The topological structure of the single-phase grid-connected inverter used in the specific embodiment of the present invention is as follows figure 1 As shown, the topological structure includes a stable DC power supply, a two-phase four-leg single-phase inverter, filter inductor and single-phase AC power grid, where the inverter is a two-phase four-leg, with 4 IGBT components , Need 4 PWM pulse drive signals. The voltage sensor on the AC grid side is used to measure the voltage of the single-phase AC grid, and the current sensor is used to measure the grid-connected current. The DC power supply realizes the conversion of DC electric energy to AC electric energy by reasonably switching on and off the switch tube of the inverter.

[0026] The present invention proposes a new repetitive controller algorithm, which can set the fundamental wav...

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Abstract

The present invention provides a harmonic current suppression method of a single phase inverter. The method analyzes the effect caused by dead zone(s) on the basis of analyzing basic vector control ofthe single phase inverter, and by adopting an improved repetitive controller algorithm, harmonic current(s) caused by the dead zone(s) or power grid harmonic(s) are effectively suppressed, so that the single phase inverter has a very high output current quality, and thus the grid-connection requirements are satisfied.

Description

Technical field [0001] The invention relates to the technical field of converter control, in particular to a harmonic current suppression method for a single-phase inverter. Background technique [0002] With the development and utilization of new energy sources, distributed power generation systems have received extensive attention and research. Photovoltaic power generation accounts for a high proportion of distributed power generation systems, and grid-connected inverters, as the core equipment in photovoltaic power generation systems, directly affect the quality of the output power of the photovoltaic power generation system. In order to improve the output power quality of the photovoltaic power generation system, the inverter current must be quickly and effectively controlled. [0003] The existing current control methods for single-phase inverters are mainly proportional resonance control in a stationary coordinate system and proportional integral control in a rotating coord...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5395H02M7/5387
CPCH02M7/5387H02M7/5395H02M1/0003H02M1/0038
Inventor 张为民吴超周一晨
Owner HEFEI WIN POWER
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