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Current waveform control method of single-phase DC-AC inverter and application thereof

A technology of DC-AC and control method, 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 output current waveform crossover distortion, etc., and achieve the suppression of current waveform crossover Distortion, reduce total harmonic current distortion, improve the effect of sine degree

Inactive Publication Date: 2011-06-29
GIANT IND TECH CO LTD
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Problems solved by technology

However, due to the dead time, the output current waveform of the closed-loop control system of the single-phase DC-AC inverter has crossover distortion (such as Figure 7 shown)

Method used

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  • Current waveform control method of single-phase DC-AC inverter and application thereof
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  • Current waveform control method of single-phase DC-AC inverter and application thereof

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Embodiment Construction

[0041] In the following, the specific implementation manners of the present invention will be further described in detail in conjunction with the accompanying drawings of the embodiments, so as to make the technical solution of the present invention easier to understand and grasp.

[0042] Introduction to the block diagram of the closed-loop control system

[0043] by comparison Figure 5 and Figure 6 The structure of the closed-loop control system of the shown prior art and the single-phase DC-AC inverter of the present invention can be seen: the composition and overall structure of the closed-loop control system are basically the same, and the same parts have been introduced in detail in the background technology section, so it will not be repeated stated. The main feature of the present invention is reflected by comparing two figures:

[0044] Using a software approach, the PI regulator PI 2 output of U LR is not directly related to the grid voltage e g After the addi...

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Abstract

The invention discloses a current waveform method of a single-phase direct current-alternating current (DC-AC) inverter, which is realized on the basis of a closed loop control system of the single-phase DC-AC inverter. A compensation frame is arranged at the output end of a current loop regulator PI2, and the sum of the compensation frame and the output ultra-long range (ULR) of the regulator PI2 is used as the input of the next level. By the method for controlling the current waveforms, the crossover distortion of the current waveforms of the single-phase DC-AC inverter caused by dead time can be effectively restrained, so that the sine degree of output current waveform of the single-phase DC-AC inverter is improved, and the total harmonic distortion degree (THD) is reduced. The inverter can work in grid and off-grid and is suitable for converting various DC voltages into AC voltages.

Description

technical field [0001] The invention relates to a single-phase DC-AC inverter, in particular to a current waveform control method of the inverter. Background technique [0002] In various power generation methods such as photovoltaic power generation, fuel cell power generation, wind power generation, wind-solar hybrid power generation, and communication power supply, it is often necessary to convert direct current into alternating current. Such as Figure 5 Shown is the structure block diagram of the closed-loop control system of the prior art single-phase grid-connected DC-AC inverter, which can realize the DC-AC inversion of voltage and current, and this DC-AC inversion can be grid-connected, It is also possible to work off-grid. [0003] Specifically: if figure 1 Shown is the main circuit topology of the traditional single-phase PWM rectifier, in the figure e g is the grid voltage, L is the series inductance, R is the parasitic resistance of L, V 1 ~V 4 with D 1 ~...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M1/12
Inventor 陈国呈魏仕桂顾红兵周勤利徐亚明
Owner GIANT IND TECH CO LTD
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