Adaptive control method for parameters of multi-inverter system based on mode switching under weak network

A self-adaptive control and multi-inverter technology, which is applied in the direction of single-network parallel feed arrangement, output power conversion device, AC power input conversion to DC power output, etc., can solve problems such as deteriorating dynamic performance
CN108933447AActive Publication Date: 2018-12-04HEFEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HEFEI UNIV OF TECH
Publication Date
2018-12-04

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Abstract

The invention discloses an adaptive control method for parameters of a multi-inverter system based on mode switching under a weak network. The invention provides an adaptive control method for parameters of a multi-inverter system based on mode switching under a weak network in allusion to problems that the stability of a multi-inverter system with a full current source mode under the weak networkis generally improved through reducing the gain of current regulators of the grid-connected inverters but that the dynamic performance is deteriorated at the same time. The method comprises the stepsof firstly switching part of the grid-connected inverters in the multi-inverter system into a voltage source grid-connected mode, and then adaptively improving the gain of the current regulators of the grid-connected inverters still operating in a current source mode. Compared with the multi-inverter system with the full current source mode, the adaptive control method not only ensures the stableoperation of the system, but also greatly improves the dynamic performance of the grid-connected inverters.
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Description

technical field

[0001] The invention relates to a control method for grid connection of a multi-inverter system, in particular to an adaptive control method for parameters of a multi-inverter system based on mode switching under a weak grid. Background technique

[0002] With the rapid development of distributed power generation systems, grid-connected inverters are widely used. Due to the existence of long-distance transmission lines and a large number of transformer devices in remote distributed power generation systems, the grid presents a non-negligible equivalent impedance, which makes the grid present a weak grid characteristic. At this time, the multi-inverter system composed of multiple grid-connected inverters will form a dynamic interconnection system with the grid during grid-connected operation. The impedance of the grid will lead to a decrease in the grid-connected stability of the multi-inverter system, causing resonance in the output current of the grid-conne...

Claims

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