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A nonlinear droop control method for a grid-connected voltage-controlled inverter

A non-linear droop and control method technology, applied in the field of nonlinear droop control, can solve the problems that the stability characteristic control strategy has not been studied in detail, and the inverter has not been connected to the grid, so as to achieve multi-grid friendliness and multi-control flexibility. sexual effect

Active Publication Date: 2018-02-27
YUNNAN POWER GRID +1
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Problems solved by technology

[0004] At present, nonlinear droop is mainly used in inverters in island-operated microgrids, but has not been used in grid-connected inverters. Due to the nonlinear characteristics of droop, there is no detailed information about its stability characteristics and corresponding control strategies. Research

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  • A nonlinear droop control method for a grid-connected voltage-controlled inverter
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  • A nonlinear droop control method for a grid-connected voltage-controlled inverter

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[0041] The technical solution in this embodiment will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present invention. Apparently, the described embodiment is only a part of the examples of the present invention, not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0042] Using a typical three-loop control inverter structure, such as figure 1 Shown, including droop control loop, virtual impedance loop, voltage control loop, current control loop. The definitions and physical meanings of some variables in the figure are shown in Table 1. The droop control loop adopts the nonlinear droop control strategy proposed by the present invention, which provides frequency reference f for the inverter; the adaptive virtual impedance proposed by the...

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Abstract

The invention relates to a nonlinear droop control method of a grid-connected voltage controlled type inverter. The method comprises the following steps of (1) designing a droop relationship curve between the output frequency and the active power of the inverter with nonlinear characteristics, wherein the curve is a piecewise function; (2) designing an inverter virtual reactance capable of realizing adaptive change along with the output active power change. Compared with a traditional method for realizing the linear droop, the control method has the advantages that the practical operation requirements of a power grid are better met; high control flexibility and power grid friendly effect are realized, so that the grid-connected inverter has the nonlinear frequency support function; the self-adaption virtual reactance adapting to the nonlinear droop can change along with the inverter force output change; in a certain range, the additional damping can be provided for the inverter; the stability of the grid-connected inverter is improved.

Description

technical field [0001] The invention relates to an inverter control method, in particular to a nonlinear droop control method when a grid-connected voltage-controlled inverter is integrated into an inductive grid, and belongs to the field of inverter control. Background technique [0002] In recent years, as more and more renewable energy sources are connected to the grid, as well as the wide application of information technology and power electronics technology, the form of traditional power systems is changing. One of the important changes is that the power generation equipment is connected to the grid through a power electronic converter, such as an inverter. Compared with the traditional synchronous machine, the control of the power electronic converter has greater flexibility, and the functions that the synchronous machine does not have can be realized through the control design. [0003] Droop control is widely used in voltage-controlled inverters, and the principle o...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
CPCH02J3/38H02J2203/20
Inventor 黄伟吴琛章雷其刘旭斐辛焕海杨浚文
Owner YUNNAN POWER GRID
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