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A control method of LC type grid-connected inverter

A control method and inverter technology, which are applied in AC network circuits, parallel feeding arrangements for a single network, conversion of AC power input to DC power output, etc., can solve the problems of low quality of grid current and total harmonic distortion of grid current. , to enhance the suppression capability, reduce the total harmonic distortion, and improve the quality of the network current.

Inactive Publication Date: 2018-01-02
XUCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] Based on one or more of the above problems, the present invention provides an LC-type grid-connected inverter control method to solve the low quality of the grid-connected inverter grid-connected current and the total harmonic distortion of the grid-connected current existing in the prior art. The problem

Method used

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  • A control method of LC type grid-connected inverter
  • A control method of LC type grid-connected inverter
  • A control method of LC type grid-connected inverter

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Embodiment 1

[0042] Embodiment 1 of the present invention provides a control method for an LC type grid-connected inverter, such as figure 1 As shown, the method includes:

[0043] 101. The grid-connected current signal i measured by the outer ring of the LC-type grid-connected inverter grid and LC-type grid-connected inverter reference current signal i ref By comparing, a first error signal is obtained, and the first error signal is acted on by a regulator to obtain an inner loop reference input signal;

[0044] Wherein, the first error signal is the outer loop measured grid-connected current signal i grid and LC-type grid-connected inverter reference current signal i ref difference.

[0045] The expression of the regulator is:

[0046] Among them, K P is the proportional parameter of the regulator, K i is the integral parameter of the regulator, and s is the sampling step size.

[0047] The parameters of the LC type filter are: L>1.95mh; Among them, f is the cut-off frequency...

Embodiment 2

[0054] Embodiment 2 of the present invention provides an LC type grid-connected inverter control method, which is suitable for such as figure 2 The LC type grid-connected inverter shown.

[0055] For an inverter equipped with an LC filter, since the size of the filter parameters directly affects the overall performance of the system, the following requirements are usually considered when designing the LC parameters:

[0056] (1) Limitation of total inductance. The impedance voltage drop under rated conditions must be less than 10% of the grid voltage.

[0057] (2) Restrictions on filter capacitance. An excessively large filter capacitor will generate a large amount of reactive power loss and reduce the overall power handling capacity of the inverter.

[0058] (3) Design limitation of resonance frequency. In order to avoid the resonant frequency from becoming a restrictive factor in the design of the inverter current controller, it is generally required that the resonant f...

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Abstract

The invention discloses an LC grid-connected inverter control method. The method comprises the steps that an LC grid-connected inverter outer loop actually-measured grid-connected current signal igrid and an LC grid-connected inverter reference current signal iref are compared to acquire a first error signal, and the first error signal is acted by a regulator to acquire an inner loop reference input signal; the inner loop reference input signal and an inductor current signal iL are compared to acquire a second error signal; the second error signal is compared with a triangular wave to generate a PWM control signal; and the PWM control signal controls the output voltage of an LC grid-connected inverter. According to the LC grid-connected inverter control method provided by the invention, the in-grid current quality of the grid-connected inverter is improved, and the total harmonic distortion of in-grid current is reduced.

Description

technical field [0001] The invention relates to the technical field of power electronic device control, in particular to an LC type grid-connected inverter control method. Background technique [0002] The grid-connected inverter is a device that feeds the DC side electric energy into the grid in the form of a sine wave current, and it is a form of inverter application. Grid-connected inverters are widely used. For example, in the occasions of AC electronic loads and large-scale grid-connected power generation of renewable energy, inverters are required to run grid-connected to feed back the power in the system to the grid. However, in order to avoid grid-connected current with poor quality polluting the grid, the waveform quality of the grid-connected current has strict requirements. The current is a sine wave with the same frequency and opposite phase as the voltage, and meets the standards of the International Electrotechnical Commission. International regulations on the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02M1/12H02M7/537
CPCH02J3/382H02M1/126H02M7/537
Inventor 郭利辉张春丽王红玲
Owner XUCHANG UNIV
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