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SOGI-based single-phase grid-connected control method under virtual coordinate system

A control method and coordinate system technology, applied in the field of single-phase grid-connected control under the virtual coordinate system based on SOGI, can solve the problem that the control accuracy has a great influence, cannot ensure that the grid-connected current has no static difference adjustment, and the PI regulator cannot achieve parallelization. There are no problems such as static adjustment of grid current

Active Publication Date: 2019-05-10
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 under virtual coordinate system
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  • SOGI-based single-phase grid-connected control method under virtual coordinate system

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Embodiment Construction

[0030] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0031] The circuit diagram of single-phase grid-connected system is as follows: figure 1 Shown, L 1 , L 2 Together with C form a single-phase LCL filter; R d It is the damping resistor connected in series on the C branch of the LCL filter capacitor, which is used to suppress the resonant 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) for 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 Respectively d-axis and q-axis current given; v d and v q are the output signals obtained after the current error signals of the d-axis and q-axis pass through the PI regulator; v α , v β fo...

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Abstract

The invention relates to an SOGI-based single-phase grid-connected control method under a virtual coordinate system. The virtual coordinate system is constructed by an SOGI to generate a virtual current component orthorhombic to a grid-connected current, and an axis current component is converted to dq axis by Park conversion. Since the current given quantity of the dq axis is DC quantity, floating control of the grid-connected current can be achieved by a PI regulator, and unit power factor grid connection is further achieved.

Description

technical field [0001] The invention belongs to the field of single-phase grid-connected control, and in particular relates to a single-phase grid-connected control method in a virtual coordinate system based on SOGI. 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 closed-loop control of the grid-connected current is generally adopted. 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 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(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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