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Three-phase four-leg inverter and control method thereof

A three-phase four-bridge arm and control method technology, which is applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc. Load life and other issues, to achieve the effect of small size, high voltage utilization, good dynamic performance

Inactive Publication Date: 2012-07-11
XIHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These control methods solve the problem of three-phase unbalanced loads to a certain extent, but they often have other disadvantages, such as complex control algorithms and large current harmonic content of the output load, etc., which affect the load to a certain extent. service life

Method used

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  • Three-phase four-leg inverter and control method thereof
  • Three-phase four-leg inverter and control method thereof
  • Three-phase four-leg inverter and control method thereof

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Embodiment 1

[0068] Such as figure 1 As shown, the circuit structure of the three-phase four-leg inverter is mainly controlled by the rectifier circuit 2, the DC filter circuit 3, the three-phase four-leg inverter circuit 4, the AC filter circuit 5, the current and voltage sampling circuits 8, 9, and DSP 7, optocoupler isolation circuit 10, and power supply circuit 6. Its input terminal is connected to the power input 1. The input power is generally various forms of single-phase AC, and it can also be in the form of DC; the output terminal is three-phase AC power. Connect to the AC grid, or other devices. The output ports are a, b, c, and n, where a, b, and c are three-phase output voltages, and n is the neutral line. When the load environment is more complicated, it can be connected according to the type of load electricity: if it is a single-phase load, it can be connected to one phase of a, b, c and the neutral line n; if it is a three-phase load, it can be connected to a, b, c accordi...

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Abstract

The invention discloses a three-phase four-leg inverter and a control method thereof. The inverter is formed by a rectification circuit, a direct current filtering circuit, a three-phase four-leg inverter circuit, an alternating current filtering circuit, a sampling circuit, a DSP controller, an opto-coupler isolation circuit and a power supply circuit. An input terminal is parallelly connected with two energy storage capacitors which are connected in series. The each energy storage capacitor is parallelly connected with an equivalent voltage-sharing resistor respectively. The control method is based on a gamma component control method in a three-dimensional space vector. A traditional three-dimensional space vector is decomposed into a two-dimensional space vector and a gamma vector. A PI controller is combined. PWM of a fourth leg is generated through controlling the gamma component so as to carry out full compensation on output voltage imbalance caused by various kinds of factors. And the advantages of the two-dimensional space vector are fully used to control the previous three legs. The control method is simple and practicable. A dynamic response is fast. Voltage stabilization precision is high. The output voltage is balanced and a harmonic wave distortion rate is low. A good control characteristic can be possessed under the conditions of unbalanced and non-linear load.

Description

technical field [0001] The invention relates to a three-phase four-leg inverter for a distributed power generation system in the field of electric energy conversion and its control method, in particular to a method for eliminating the output voltage of a distributed power generation system by utilizing the specific function of the γ component in a three-dimensional space vector Unbalanced and various distortion three-phase four-leg inverter and its control method. Background technique [0002] Distributed power generation technology and micro-grid technology can make good use of new renewable energy to generate electricity and improve the efficiency of power generation. Therefore, as a supplement to public power grid power supply, it has great development potential, especially for remote areas, distributed power generation The system has unique advantages. It can not only avoid the huge cost of long-distance power transmission network construction, but also provide reliable ...

Claims

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Application Information

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IPC IPC(8): H02M7/5387
Inventor 王军张晓勇彭宏
Owner XIHUA UNIV
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