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Topological structure of photovoltaic grid-connected single-phase inverter employing fly-wheel neutral point potential

A single-phase inverter and topological structure technology, applied in photovoltaic power generation, AC power input conversion to DC power output, electrical components, etc., can solve problems such as large leakage current, achieve low switching loss, and reduce common mode current , good co-modeling effect

Inactive Publication Date: 2016-05-25
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the freewheeling mode, these topologies still generate a large leakage current because the freewheeling circuit potential is suspended.

Method used

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  • Topological structure of photovoltaic grid-connected single-phase inverter employing fly-wheel neutral point potential
  • Topological structure of photovoltaic grid-connected single-phase inverter employing fly-wheel neutral point potential
  • Topological structure of photovoltaic grid-connected single-phase inverter employing fly-wheel neutral point potential

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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] Such as figure 1 As shown, a photovoltaic grid-connected single-phase inverter topology with mid-point potential freewheeling includes sequentially connected photovoltaic arrays, clamping capacitor banks, single-phase full-bridge inverters, filter circuits and power grids. It also includes a bidirectional clamping circuit unit. The bidirectional clamping circuit unit includes a positive clamping circuit unit and a negative clamping circuit unit. Both the positive clamping circuit unit and the negative clamping circuit unit are connected to the clamping capacitor group and the filter circuit.

[0033] The clamping capacitor group includes a first clamping capacitor and a second clamping capacitor, the positive pole of the first clamping capacitor is connected to the positive pole of the photovoltaic array, the negative pole of the seco...

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Abstract

The invention relates to a topological structure of a photovoltaic grid-connected single-phase inverter employing a fly-wheel neutral point potential. The topological structure of the photovoltaic grid-connected single-phase inverter comprises a photovoltaic array, a clamping capacitor bank, a single-phase full-bridge inverter, a filter circuit, a power grid and a two-way clamping circuit unit, wherein the photovoltaic array, the clamping capacitor bank, the single-phase full-bridge inverter, the filter circuit and the power grid are sequentially connected with one another; the two-way clamping circuit unit comprises a positive clamping circuit unit and a negative clamping circuit unit; and the positive clamping circuit unit and the negative clamping circuit unit are connected with the clamping capacitor bank and the filter circuit. Compared with the prior art, the topological structure of the photovoltaic grid-connected single-phase inverter has the advantages of constant common-mode voltage, good common-mode characteristic and the like.

Description

technical field [0001] The invention relates to a topological structure of a single-phase inverter, in particular to a topological structure of a photovoltaic grid-connected single-phase inverter with midpoint potential freewheeling. Background technique [0002] Photovoltaic grid-connected inverters require high efficiency, low cost, and can withstand the adverse effects of large output voltage fluctuations of photovoltaic arrays, and their AC output must also meet high power quality. According to whether the inverter has an isolation transformer, it can be divided into isolation type and non-isolation type. The isolated photovoltaic inverter realizes the electrical isolation of the power grid and the battery panel, and ensures the safety of people and equipment, but it is bulky, expensive, and the system conversion efficiency is low. The non-isolated photovoltaic inverter structure does not contain a transformer, and has many advantages such as high efficiency, small size...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02J3/38
CPCH02J3/383H02M7/5387Y02E10/56
Inventor 赵晋斌孙慕文龚锦霞冯苗苗
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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