LCL type grid-connected inverter without resonance damping and integrated design method thereof

A design method and inverter technology, which can be applied in the parallel feeding arrangement of a single network, the conversion device of output power, and the conversion of AC power input into DC power output, etc., can solve the problem of increasing control complexity or cost, reducing filtering efficiency, Power loss and other issues, to achieve the effect of low cost, simple design process, and easy engineering promotion

Inactive Publication Date: 2012-10-31
CIXI YUSHI COMM ELECTRIC POWER EQUIPCO
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Problems solved by technology

The traditional inverter design method usually designs the filter and the controller independently. Since the filter does not fully consider the challenge of its resonant peak to the stability of the control system during the design process, it is necessary to use passive damping or active damping technology to ensure The control sys

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  • LCL type grid-connected inverter without resonance damping and integrated design method thereof
  • LCL type grid-connected inverter without resonance damping and integrated design method thereof
  • LCL type grid-connected inverter without resonance damping and integrated design method thereof

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Embodiment Construction

[0014] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, the specific implementation modes of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the above-mentioned and other purposes, features and advantages of the present invention will be clearer. Like reference numerals designate like parts throughout the drawings. The drawings have not been drawn to scale, emphasis instead being placed upon illustrating the gist of the invention.

[0015] Combine below Figure 1 to Figure 4 The specific embodiment of the LCL type grid-connected inverter without resonance damping and the integrated design method thereof according to the specific embodiment of the present invention will be described in detail. figure 1 It is a schematic diagram of the circuit structure and control structure of the LCL type grid-connected inverter without resonance dampi...

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Abstract

The invention provides an LCL type grid-connected inverter without resonance damping. The grid-connected inverter comprises an inverter, an LCL filter, a current sensor, a voltage sensor, a current control loop and a switch driving circuit, wherein the LCL filter is used for grid-connected operation of the inverter; the current sensor is used for grid-connected current detection; the voltage sensor is used for grid-connected voltage detection; the current control loop is used for grid-connected operation of the inverter; the inverter is directly connected with the LCL filter and the switch driving circuit; and the current control loop is used for generating a modulation signal, which is required by an inverse switch in operation, and then providing the modulation signal to the switch driving circuit. The invention further provides an integrated design method of the LCL type grid-connected inverter without resonance damping. According to the invention, control performances of an L type grid-connected inverter and the attenuation property of the LCL filter to a high frequency current ripple are effectively synthesized; and the LCL type grid-connected inverter without resonance damping, provided by the invention, has the advantages of simple design process, low cost and easiness for engineering promotion.

Description

technical field [0001] The invention relates to the technical field of grid-connected inverters, in particular to an LCL type grid-connected inverter without resonance damping and an integrated design method thereof. Background technique [0002] In the prior art inverter power supply with the function of grid-connected power generation, the inverter controls the output current during grid-connected operation to ensure that the current is a strict sine wave and has a high power factor for power generation. The traditional inverter design method usually designs the filter and the controller independently. Since the filter does not fully consider the challenge of its resonant peak to the stability of the control system during the design process, it is necessary to use passive damping or active damping technology to ensure The control system is stable, the former will reduce the filtering efficiency and introduce power loss; the latter increases the control complexity or cost, ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02M7/5387
Inventor 薛明雨
Owner CIXI YUSHI COMM ELECTRIC POWER EQUIPCO
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