Photovoltaic inverter harmonic suppression method based on improved PI+ repetition control

A photovoltaic inverter and repetitive controller technology, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve the problem of large amount of calculation, reduction of calculation amount, and periodic delay of control components of repetitive control parts, etc. problems, to achieve the effect of speeding up the tracking speed, speeding up the dynamic response speed, and reducing the deviation

Inactive Publication Date: 2019-04-26
GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology

For example, when extracting harmonic signals in the dq coordinate system, only the PI controller is used to compensate the tracking of the harmonic signals. Due to the limitation of the bandwidth of the traditional PI control, it is impossible to track the harmonic components at the harmonic frequency without static error. Wave suppression is limited
Aiming at the problem that PI control harmonics cannot keep up with only single-rotation coordinate transformation, some scholars have proposed a specified sub-harmonic current control strategy for multi-synchronous rotating coordinate systems, and some scholars have proposed to use fast Fourier transform to extract harmonic component amplitudes. Values ​​are used for PI co

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  • Photovoltaic inverter harmonic suppression method based on improved PI+ repetition control

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[0041] The accompanying drawings are for illustrative purposes only, and should not be construed as limitations on this patent; in order to better illustrate this embodiment, certain components in the accompanying drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art It is understandable that some well-known structures and descriptions thereof may be omitted in the drawings. The positional relationship described in the drawings is for illustrative purposes only, and should not be construed as a limitation on this patent.

[0042] Such as figure 1 As shown, a photovoltaic inverter harmonic suppression method based on improved PI+ repetitive control, including the following steps:

[0043] S1: Construct the LCL type grid-connected photovoltaic inverter PI+repetitive controller model;

[0044] S2: Using the zero-phase error feed-forward compensation method, add harmonic component feed-forward control to ...

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Abstract

The invention relates to the technical field of power systems, in particular to a photovoltaic inverter harmonic suppression method based on improved PI+ repetition control. The method comprises the following steps of S1, constructing a PI+ repetition controller model of an LCL type grid-connected photovoltaic inverter; S2, using a zero phase error feedforward compensation method, and adding the harmonic component feedforward control to a PI+ repetition controller. The method can enable the photovoltaic inverter to output high-accuracy harmonic current compensation through the repetition controller while using a PI controller to output a fundamental active power, consider that the repetition controller has the cycle delay and bad dynamic response, and add harmonic component feedforward control to speed up the dynamic response speed of harmonic suppression, thereby achieving the harmonic suppression function.

Description

technical field [0001] The present invention relates to the technical field of power systems, and more specifically, to a method for suppressing harmonics of photovoltaic inverters based on improved PI+ repetitive control. Background technique [0002] As the country vigorously promotes the development of new energy, the scale of photovoltaic grid-connected inverters has gradually expanded, and the extensive use of power electronic equipment has introduced harmonics to the power grid. The problem of harmonics is becoming more and more serious. If resonance is caused, it will endanger the safety of electricity consumption of the majority of users. [0003] At present, it is usually more economical to control harmonics to configure passive filters for lines, but passive filters can only control harmonic currents of corresponding frequencies, and a more efficient method is to use active filters for dynamic tracking compensation. However, this approach is more expensive. In vi...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/40
Inventor 甘德树裴星宇程旭赵晓燕林桂辉吴海雄廖石江林敏洪
Owner GUANGDONG POWER GRID CO LTD
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