Single-phase inverter and control method and control system thereof

A single-phase inverter, source inverter technology

Pending Publication Date: 2022-05-17
GUANGDONG ZHICHENG CHAMPION GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the topology proposed in this patent improves the gain of the original inverter, it introduces too many switching devices, which obviously increases the cost, which is not conducive to low-cost industrial applications.
In addition, its control is relatively complicated, and it is necessary to judge the voltage to switch the control, which is not conducive to the stability of the system
In addition, the waveform of the boost part is fitted by a boost circuit, the output waveform is not filtered by the inductor, and the waveform quality is relatively poor

Method used

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Embodiment Construction

[0041] The topology of the novel high-gain dual-terminal common-ground single-phase inverter based on the Semi-Z source inverter proposed in Embodiment 1 of the present invention is as follows: Figure 4 shown. by the input source V in , inductance L 1 , inductance L 2 , inductance L 3 , inductance L 4 , capacitance C 1 , capacitance C 2 , capacitance C o , switch tube S 1 , switch tube S 2 and switch tube S 3 and so on. where the capacitor C 1 , capacitance C 2 , inductance L 1 , inductance L 2 , switch tube S 2 and switch tube S 3 Constitutes a Semi-Z source inverter. In the inverter part, it can be seen from the Semi-Z source inverter that the switch tube S 2 and switch tube S 3 cannot be turned on at the same time. Similarly, for the boost circuit, the switch tube S 1 with switch S 2 and switch tube S 3 The series branches cannot conduct at the same time. Therefore, only two switching tubes can be turned on at a time. Therefore, the proposed high-gai...

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Abstract

The invention discloses a single-phase inverter and a control method and system thereof, and the single-phase inverter comprises a Semi-Z source inverter. The input source is connected with the input side of the Semi-Z source inverter; the boosting module is connected with the output side of the Semi-Z source inverter; and the filtering module is connected with the boosting module. The invention provides an improved topology and control for a Semi-Z source inverter topology, and a novel double-end common-ground single-phase inverter is combined with the Semi-Z source inverter, so that the limitation that the gain is 1 is broken through, and high gain is realized, that is, the positive gain is infinite, and the negative gain is also infinite.

Description

technical field [0001] The invention relates to a non-isolated inverter system, in particular to a single-phase inverter and its control method and control system. Background technique [0002] In photovoltaic grid-connected systems, photovoltaic inverters play an important role in the process of electric energy conversion. As an important interface between photovoltaic cells and the grid, photovoltaic grid-connected inverters can be divided into isolated inverters and non-isolated inverters according to whether the inverter system contains an isolation transformer. In an isolated inverter system, a high-frequency transformer is usually installed on the DC side or a low-frequency transformer is installed on the low-frequency side. The transformer not only boosts the DC voltage of the photovoltaic cell, but also isolates the DC side and the AC side, so that there is no DC loop between the two. However, the existence of the transformer increases the loss of the entire system...

Claims

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Application Information

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IPC IPC(8): H02M3/04H02M3/158H02M1/14H02M7/44H02M7/537
CPCH02M3/1584H02M7/537H02M1/14H02M3/04H02M7/44Y02B70/10
Inventor 汪洪亮唐伟岳秀梅张文元王瀚哲罗安陈燕东李民英陈宇
Owner GUANGDONG ZHICHENG CHAMPION GROUP
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