O-Z source photovoltaic grid-connected inverter

An inverter, photovoltaic technology, applied in photovoltaic power generation, irreversible DC power input conversion to AC power output, AC network circuit and other directions, can solve the problem of large starting input current, limited boost capacity, large capacitor voltage stress problem, to achieve the effect of strong boost capability, less circuit components, and isolation impact

Active Publication Date: 2021-03-16
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the capacitor voltage stress in the Z-source network of the Z-source inverter is too large, the boosting capacity is limited, and problems such as large starting input current are gradually exposed.

Method used

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  • O-Z source photovoltaic grid-connected inverter
  • O-Z source photovoltaic grid-connected inverter
  • O-Z source photovoltaic grid-connected inverter

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Embodiment Construction

[0016] In order to make the technical means and effects realized by the present invention easy to understand, the present invention will be described in detail below in conjunction with the embodiments and accompanying drawings.

[0017]

[0018] figure 1 It is the main topology structure diagram of the O-Z source photovoltaic grid-connected inverter in the embodiment of the present invention.

[0019] Such as figure 1 As shown, an O-Z source photovoltaic grid-connected inverter 100 in this embodiment includes a photovoltaic array module 10 , an O-Z source network 20 , an inverter bridge 30 , a filter circuit 40 and a grid 50 .

[0020] As a power source, the photovoltaic array module 10 has a positive pole and a negative pole.

[0021] figure 2 is a topology diagram of the O-Z source network in the embodiment of the present invention.

[0022] Such as figure 2 As shown, the O-Z source network 20 is connected to the photovoltaic array module 10 and has a power diode 2...

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Abstract

The invention provides an O-Z source photovoltaic grid-connected inverter which comprises the components of a photovoltaic array module which serves as a power supply; an O-Z source network connectedwith the photovoltaic array module and provided with a power diode, a coupling inductance coil and an energy storage capacitor; an inverter bridge connected with the O-Z source network and connected with the negative electrode of the photovoltaic array module; a filter circuit connected with the inverter bridge; and a power grid, wherein the power grid is connected to the filter circuit. The powerdiode is provided with an anode and a cathode, the anode is connected with the anode of the photovoltaic array module, the coupling inductance coil is provided with an N1-side coil and an N2-side coil, the dotted terminal of the N1-side coil is connected with the cathode of the power diode, the energy storage capacitor is provided with an anode and a cathode, the anode is connected with the anodeof the photovoltaic array module, the cathode is connected with the dotted terminal of the N2 side coil, and the synonym terminal of the N1 side coil and the synonym terminal of the N2 side coil areconnected with the inverter bridge.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to an O-Z source photovoltaic grid-connected inverter. Background technique [0002] With the gradual depletion of traditional fossil energy, green renewable energy has developed rapidly. In the past ten years, solar photovoltaic power generation technology has received continuous attention from various countries and has become one of the main ways to utilize solar energy. Carrying out research on solar photovoltaic power generation systems has great theoretical and practical significance for alleviating energy and environmental problems, improving energy consumption structure, improving the performance of distributed power generation systems, and developing the photovoltaic power generation industry. [0003] The power adjustment system of a typical photovoltaic power generation system is divided into a single-stage control structure and a two-stage control s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02M7/5387H02M1/12H02M1/32H02J3/38
CPCH02M7/48H02M7/5387H02M1/126H02M1/32H02J3/381H02J2300/24Y02E10/56
Inventor 罗韡吕哲王琛琛周明利陈兴辉
Owner UNIV OF SHANGHAI FOR SCI & TECH
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