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Harmonic wave damping control method for one-phase LCL type grid-connected inverter

An inverter, single-phase technology, applied in the field of harmonic damping control of single-phase LCL type grid-connected inverters, can solve problems such as increasing investment costs, and achieve the effect of improving quality and enhancing suppression capability

Active Publication Date: 2015-07-01
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The ripple fluctuation at both ends of the DC side voltage is an important reason for the harmonic component of the input current command signal. Although increasing the capacitance value of the DC side can reduce the ripple fluctuation at both ends of the DC side voltage, it will increase the investment cost

Method used

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  • Harmonic wave damping control method for one-phase LCL type grid-connected inverter
  • Harmonic wave damping control method for one-phase LCL type grid-connected inverter
  • Harmonic wave damping control method for one-phase LCL type grid-connected inverter

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Embodiment Construction

[0026] Taking the grid-connected photovoltaic power generation system as an example to illustrate, figure 1 It is a structural diagram of a single-phase photovoltaic system, which consists of a photovoltaic array, a front-stage Boost circuit, a rear-stage grid-connected inverter, and an LCL filter. U in the picture pv and I pv Output voltage and current for the photovoltaic array, I 1 is the inverter side inductor current, I 2 is the grid side inductor current, I C is the filter capacitor current, U dc is the DC energy storage capacitor voltage of the inverter circuit, U grid is the grid voltage, L grid and R grid Represents grid impedance, U pcc is the grid-connected point voltage of the grid-connected inverter. The pre-stage Boost circuit realizes the maximum power point tracking control, by controlling the switch tube S 0 The turn-on and turn-off of the photovoltaic side completes the single-phase transfer of energy from the photovoltaic side to the DC side. The ...

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Abstract

The invention discloses a harmonic wave damping control method for a one-phase LCL type grid-connected inverter. The harmonic wave damping control method for the one-phase LCL type grid-connected inverter mainly comprises a fundamental wave control loop, a harmonic wave damping loop and a capacitance current inner loop. The fundamental wave control loop enables fundamental wave components in non-error follow current command signals of network-entry currents to change, and grid connection with a high power factor is achieved. The harmonic wave damping loop can inhibit background harmonic voltage of a power grid and the influence on the network-entry currents of the grid-connected inverter from the harmonic wave components of the current command signals at the same time, and provide the network-entry currents with high quality. The capacitance current inner loop is used for improving system damping, inhibits the LCL resonance peak and improves the system stability. The harmonic wave damping control method is easy to achieve, and can improve the ability of the grid-connected inverter to inhibit the harmonic wave components in the background harmonic voltage of the power grid and the current command signals, and the quality of the network-entry currents of the grid-connected inverter is improved. The harmonic wave damping control method is suitable for a grid-connected photovoltaic power generation system, a fuel battery and a wind power generation grid-connected system of an LCL type filter.

Description

technical field [0001] The invention relates to the technical field of grid-connected inverter control, in particular to a harmonic damping control method for a single-phase LCL type grid-connected inverter. Background technique [0002] In recent years, with the continuous depletion of traditional fossil energy, new energy power generation technology has attracted more and more attention. Applying new energy power generation to the grid-connected power generation system to realize local energy consumption is an effective means of utilizing new energy. The grid-connected inverter is the core device of the grid-connected power generation system, and generally adopts the current control method. The total harmonic distortion (THD) of grid-connected current is an important index to measure the quality of grid-connected power generation. The IEEE Std929-2000 standard requires that the total harmonic distortion be less than 5%. In order to obtain high-quality grid-connected curr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02M7/5387H02M1/12H02J3/38
Inventor 罗安王逸超金国彬郭佳才徐千鸣贺加贝
Owner HUNAN UNIV
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