A multi-inverter parallel system suitable for microgrid

A multi-inverter, micro-grid technology, applied in the field of inverters, achieves the effects of reducing the size of the circulating current, good current sharing effect, and simple control method

A multi-inverter, micro-grid technology, applied in the field of inverters, achieves the effects of reducing the size of the circulating current, good current sharing effect, and simple control method

CN109245159BActive Publication Date: 2020-05-01DONGGUAN UNIV OF TECH
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  • A multi-inverter parallel system suitable for microgrid
  • A multi-inverter parallel system suitable for microgrid
  • A multi-inverter parallel system suitable for microgrid

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Embodiment Construction

[0037] The accompanying drawings are for illustrative purposes only and cannot be construed as limiting the patent;

[0038] In order to better illustrate this embodiment, some parts in the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0039] For those skilled in the art, it is understandable that some well-known structures and descriptions thereof may be omitted in the drawings.

[0040] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0041] Such as figure 1 As shown, a multi-inverter parallel system suitable for micro-grid, by dynamically adjusting the circulating current signals of all three-phase inverters, so that all three-phase inverters can achieve a current sharing effect; including three three-phase inverters, 3 parallel hardware modules and program modules

[0042] Each three-phase inverter is electrically conne...

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Abstract

A multi-inverter parallel system suitable for micro-grid is characterized in that the circulating current signals of all three-phase inverters are dynamically regulated so as to realize current equalization effect. The system includes N three-phase inverters, N parallel hardware modules and program modules; The N is a positive integer greater than or equal to 2; The three-phase inverter is electrically connected with a parallel hardware module. The parallel hardware module is used for collecting the parameter information of the corresponding inverter and transmitting the data to the microprocessor chip according to the parameter information. The parameter information includes phase information, current information and state information. The parallel hardware module is electrically connected with a microprocessor chip in a corresponding three-phase inverter; The N parallel hardware modules are electrically connected with each other; The program module comprises a current sharing module,wherein the current sharing module is used for ensuring that the circulating current of each three-phase inverter is equal to zero.

Description

technical field [0001] The invention relates to the field of inverters, and more specifically, relates to a multi-inverter parallel connection system suitable for microgrids. Background technique [0002] At present, the parallel operation of multiple inverters generally adopts the power droop control method. By calculating the output power, the frequency and amplitude of the output voltage of the inverters are dynamically adjusted. Although the inverters do not need to be connected by communication lines , but the current sharing effect is not ideal, the dynamic current sharing effect is poor, and the current sharing control method is related to the properties of the power connection line between the inverters, that is, when the power connection line is purely resistive or purely inductive, the corresponding The control method is different. If it is a resistive load, the control method is more complicated. Contents of the invention [0003] The invention overcomes the de...

Claims

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Application Information

Patent Timeline
01 May 2020
Publication
CN109245159B
IPC
H02J3/38
CPC
H02J3/38
Inventors
张志