Micro-grid multi-inverter parallel voltage control method for droop control of robust power

A voltage control method and multi-inverter technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problems of large circulating current and low precision of power sharing, achieve suppression of internal circulation, improve power sharing effect, and ensure consistency sexual effect

Active Publication Date: 2014-07-09
HUNAN UNIV
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  • Abstract
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a micro-grid multi-inverter parallel voltage control method with robust power droop control for the deficiencies of the existing technology, and to solve the problem of applying the existing method to multi-inverter in low-voltage micro-grid In the case of parallel current sharing control, the power sharing accuracy is not high and the circulation current is large

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  • Micro-grid multi-inverter parallel voltage control method for droop control of robust power
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  • Micro-grid multi-inverter parallel voltage control method for droop control of robust power

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Embodiment Construction

[0031] Such as figure 1 As shown, the microgrid multi-inverter parallel system of an embodiment of the present invention includes several parallel inverters, and the inverters are connected to the power grid; the inverters include a DC power supply, an inverter circuit, and an LC filter circuit , A / D sampling circuit, phase-locked loop circuit, DSP controller, drive protection circuit, touch screen, the DC power supply, inverter circuit, and LC filter circuit are connected in sequence, and the LC filter circuit is connected to the microgrid; the A The input end of the / D sampling circuit is connected with the LC filter circuit; the DSP controller is connected with the input end of the drive protection circuit, the output end of the A / D sampling circuit, the touch screen, and the output end of the phase-locked loop circuit; the phase-locked loop circuit output end is connected; The input end of the ring circuit is connected with the microgrid; the drive protection circuit drive...

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Abstract

The invention discloses a micro-grid multi-inverter parallel voltage control method for droop control of robust power. The method comprises the following steps of: specific to each inverter in a micro-grid, computing and synthesizing an inverter output reference voltage by adopting a robust power droop controller; and introducing virtual complex impedance containing a resistance component and an inductive impedance component, and keeping inverter output impedance in a pure resistance state under a power frequency condition by adopting a multi-loop voltage control method based on virtual impedance and quasi-resonance PR (Proportional-Resonant) control, thereby realizing micro-grid multi-inverter parallel running and power equation, wherein the robustness of a micro-grid parallel system on numeric value computing errors, parameter drift, noise interference and the like is enhanced. Due to the adoption of the method, the defects of larger loop current of a parallel system, non-uniform power distribution and the like caused by the inductivity of the impedance output by inverters in the conventional droop method are overcome; and the method is suitable for multi-grid parallel uniform current control in a low-voltage micro-grid.

Description

technical field [0001] The invention relates to the field of micro-grid multi-inverter control, in particular to a micro-grid multi-inverter parallel voltage control method for robust power droop control. Background technique [0002] In order to better tap the potential of distributed power generation and solve the adverse effects of distributed power generation on large power grids, the use of microgrids to organize distributed power access has become a hot spot in current power system research. In recent years, with the operation of many experimental micro-grids, certain achievements have been made in micro-grid energy management systems and power electronic interface control. Microgrid is increasingly becoming a research hotspot. [0003] A key issue in the operation of low-voltage microgrids is the parallel operation of multiple inverters. The control strategy of a single inverter determines its output impedance characteristics, and the output impedance characteristic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/46
Inventor 罗安陈燕东张庆海彭自强周洁周乐明黄媛王华军龙际根
Owner HUNAN UNIV
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