Multi-functional new energy grid-connected inverter

An inverter, new energy technology, applied in the direction of converting AC power input to DC power output, irreversible DC power input converting to AC power output, AC network circuit, etc. It can solve the failure of passive detection method and external detection method. High cost, affecting the power quality of the power grid, etc., to achieve the effects of high-quality power conversion, suppression of high-frequency harmonic resonance, and increased impedance

Inactive Publication Date: 2018-06-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The passive detection method is relatively simple to implement, but when the output power of the grid-connected inverter is basically close to the power of the local grid load, the passive detection method will fail
The active detection method has the problem of affecting the power quality of the power grid, while the cost of the external detection method is relatively high

Method used

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  • Multi-functional new energy grid-connected inverter
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  • Multi-functional new energy grid-connected inverter

Examples

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Embodiment Construction

[0040] The present invention will be further described below in conjunction with the accompanying drawings.

[0041] Such as figure 1 As shown, a multifunctional new energy grid-connected inverter includes a distributed power supply 1 , a DC voltage converter 8 , a DC / AC inverter 9 , an output filter circuit 10 , and a power grid 11 connected in sequence. The distributed power supply 1 is connected to the control unit 3 through the auxiliary power supply 2, the auxiliary power supply 2 adopts the HV9120 chip, the input end of the auxiliary power supply 2 is connected to the output end of the distributed power supply 1, and the output end of the auxiliary power supply 2 is connected to the control unit Unit 3. Signals are transmitted between the control unit 3 and the DC voltage converter 8 and DC / AC inverter 9 through wires; the control unit 3 includes a current tracking control unit 4 to suppress the DC component unit 5 and suppress high-frequency resonance Unit 6, island d...

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Abstract

The invention discloses a multi-functional new energy grid-connected inverter. The multi-functional new energy grid-connected inverter comprises a distributed power supply, a DC voltage converter, a DC / AC inverter, an output filtering circuit and a power grid which are sequentially connected, wherein the distributed power supply is connected with a control unit by an auxiliary power supply, wire signal transmission is performed among the control unit, the DC voltage converter and the DC / AC inverter, and the control unit comprises a current tracking control unit, a DC component suppression unit, a high-frequency harmonic suppression unit and an island detection unit. The multi-functional new energy grid-connected inverter has the functions that a DC component output from the inverter is effectively prevented, the high-frequency harmonic is prevented, high-quality electric energy conversion is achieved, and island detection is achieved.

Description

technical field [0001] The invention relates to the field of new energy power generation, in particular to a multifunctional new energy grid-connected inverter. Background technique [0002] As a key component of new energy power generation systems, grid-connected inverters have been extensively studied in recent years. However, there are still deficiencies in the suppression of DC components, high-frequency resonance, and island detection. [0003] According to whether there is a transformer link in the inverter, it can be divided into isolated inverter and non-isolated inverter. The isolated inverter uses the traffic and DC blocking characteristics of the transformer to remove the DC component to a certain extent, but it will increase the cost and volume and reduce the efficiency; the non-isolated inverter has higher efficiency and lower cost. In the main form of current application, the DC component in the output of the reversible inverter will directly enter the grid, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02M7/5387H02M7/48H02M1/12
CPCH02J3/383H02M1/126H02M7/48H02M7/5387H02J3/388H02M7/4803Y02B70/10Y02E10/56
Inventor 孔祥玉肖杰
Owner TIANJIN UNIV
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