Grid-connected inverter frequency adaptive control method, device, equipment and storage medium

A technology of frequency self-adaptation and control method, applied in the direction of circuit devices, harmonic reduction devices, AC network circuits, etc., can solve problems such as poor stability, low accuracy, complex structure, etc., to improve accuracy and stability, Realize the effect of frequency self-adaptation and small calculation burden

Active Publication Date: 2021-08-13
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the control strategy of the existing grid-connected inverter cannot output high-quality grid-connected current after the grid frequency shifts, the control effect is not good, the accuracy is not high, the structure is complex, and the stability is poor, etc. question

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  • Grid-connected inverter frequency adaptive control method, device, equipment and storage medium
  • Grid-connected inverter frequency adaptive control method, device, equipment and storage medium
  • Grid-connected inverter frequency adaptive control method, device, equipment and storage medium

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Embodiment 1

[0065] Such as figure 1 As shown, the grid-connected inverter frequency adaptive control method of the present invention, the control method includes the following steps:

[0066] S1: Obtain the voltage signal and grid-connected current signal at the public coupling point in the power system, according to figure 2 , respectively collect the grid-connected current signal and the voltage signal at the common coupling point through the current sampling unit 101 and the voltage sampling unit 102;

[0067] S2: Extract the phase angle information of the voltage signal at the common coupling point through the phase-locked loop 104 (ie PLL); this phase angle information is consistent with the current value required by the power system I ref Co-generates the reference current signal for the control loop i ref ; The obtained grid-connected current signal passes through abc / ɑβ After the coordinate system converter 103, one way forms a grid-connected current feedback active damper...

Embodiment 2

[0113] Such as Figure 1 to Figure 6 As shown, the difference between this embodiment and Embodiment 1 is that this embodiment provides a frequency adaptive control device for a grid-connected inverter, including:

[0114] The data acquisition unit is used to acquire the voltage signal at the common coupling point and the grid-connected current signal in the power system, and extracts the phase angle information of the voltage signal at the common coupling point through the PLL;

[0115] A pre-processing unit, used for the phase angle information of the voltage signal and the grid-connected current value required by the power system I ref , get the reference current signal in the control system (i.e. control loop) i ref ;The obtained grid-connected current signal is used as the feedback signal in the control system;

[0116] A calculation unit, configured to make a difference between the reference current signal and the grid-connected current signal to obtain a difference si...

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Abstract

The invention discloses a grid-connected inverter frequency adaptive control method and device, equipment and a storage medium. The method comprises the steps of: acquiring a voltage signal and a grid-connected current signal at a common coupling point in a power system, and extracting the phase angle information of the voltage signal at the common coupling point through a phase-locked loop; acquiring a reference current signal in a control system according to the phase angle information of the voltage signal and a grid-connected current value required by the power system; carrying out subtraction on the reference current signal and the grid-connected current signal to obtain a difference signal; inputting the difference signal into a current controller for current adjustment to obtain a control signal; and inputting the control signal into a grid-connected inverter to control the on-off of internal electronic devices of the grid-connected inverter, wherein the current controller is a composite control structure in which a proportional resonance controller (PR) is connected with a repetitive controller (RC) in parallel, and the frequency adaptive part is realized through a universal Newton fractional delay filter. According to the grid-connected inverter frequency adaptive control method and the device, high-quality grid-connected current can be output after the frequency of the power grid deviates.

Description

technical field [0001] The invention relates to the technical field of grid-connected inverter control, in particular to a method, device, equipment and storage medium for frequency self-adaptive control of a grid-connected inverter. Background technique [0002] Affected by the region, in my country, the electric energy generated by distributed energy needs to be transmitted over long distances. At this time, the impedance of the grid line cannot be ignored, and the grid has the characteristics of a weak grid. Under a weak grid, the grid-connected current harmonics will be further amplified, thereby increasing the voltage harmonics at the point of public coupling (PCC), and the grid frequency fluctuation will be more serious. [0003] Grid-connected inverter is the key equipment for distributed energy grid-connected, and its control performance determines the quality of grid-connected current. It is of great significance to study the inverter control strategy in weak grid e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/48H02J3/01H02J3/24
CPCH02J3/01H02J3/48H02J3/241Y02E40/40
Inventor 王力为
Owner SOUTHWEST PETROLEUM UNIV
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