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Sogi-based single-phase grid-connected control method in virtual coordinate system

A control method and coordinate system technology, which is applied in the field of single-phase grid-connected control under the virtual coordinate system based on SOGI, can solve the problem that the PI regulator cannot realize the adjustment of grid-connected current without static difference, and cannot ensure the adjustment of grid-connected current without static difference , Control accuracy is greatly affected, etc., to achieve the effect of unit power factor grid connection

Active Publication Date: 2022-05-20
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0003] The implementation of the PI regulator is relatively simple, but because the grid-connected current is a periodically changing AC quantity, the PI regulator cannot realize the non-static regulation of the grid-connected current
[0004] The PR regulator can realize the non-static regulation of the grid-connected current by obtaining infinite gain at the fundamental angular frequency, but its control accuracy is greatly affected by the system parameters, and it cannot ensure the non-static regulation of the grid-connected current

Method used

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  • Sogi-based single-phase grid-connected control method in virtual coordinate system
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  • Sogi-based single-phase grid-connected control method in virtual coordinate system

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Embodiment Construction

[0030] The present invention will now be further described in conjunction with the embodiments and accompanying drawings:

[0031] The circuit diagram of the single-phase grid-connected system is as follows figure 1 shown, L 1 , L 2 and C together form a single-phase LCL filter; R d is a damping resistor connected in series on branch C of the LCL filter capacitor to suppress the resonance peak of the LCL filter; V in is the input voltage; v g is the grid voltage; i 2 is the grid-connected current; i α with i 2 same, i β by i 2 Generated by SOGI, Q 1 (s) is i 2 (s) to i β (s) transfer function; i d and i q i respectively α , i β The d-axis current component and the q-axis current component in the dq coordinate system obtained after Park transformation; and are the current given quantities of the d-axis and q-axis, respectively; v d and v q are the output signals of the d-axis and q-axis current error signals after passing through the PI regulator; v α , v ...

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Abstract

The invention relates to a SOGI-based single-phase grid-connected control method in a virtual coordinate system, which generates a virtual current component orthogonal to the grid-connected current through SOGI, constructs a virtual coordinate system, and transforms the axial current component into the dq axis through Park transformation . Since the given current of the dq axis is a DC flow, the PI regulator can be used to realize the non-static adjustment of the grid-connected current, and then realize the grid-connected unit power factor.

Description

technical field [0001] The invention belongs to the field of single-phase grid-connected control, in particular to a single-phase grid-connected control method based on a SOGI virtual coordinate system. Background technique [0002] In the single-phase grid-connected control, in order to ensure that the grid-connected current can meet the relevant requirements, the grid-connected current closed-loop control is generally used. Common current regulators are proportional-integral (PI) regulators and proportional-resonant (PR) regulators. [0003] The implementation of the PI regulator is relatively simple, but because the grid-connected current is an alternating current that changes periodically, the PI regulator cannot realize the static-free adjustment of the grid-connected current. [0004] The PR regulator can realize the static-free adjustment of the grid-connected current by obtaining an infinite gain at the fundamental angular frequency, but its control accuracy is grea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02M7/42
CPCY02E40/40
Inventor 解恩于博文薛世阳任璐张智
Owner NORTHWESTERN POLYTECHNICAL UNIV
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