Current sharing control method and single-phase inverter parallel system

A single-phase inverter, flow control technology, applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc. The effect of the response

Pending Publication Date: 2021-03-30
SHENZHEN ECOWATT POWER
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provid

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  • Current sharing control method and single-phase inverter parallel system
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  • Current sharing control method and single-phase inverter parallel system

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Embodiment Construction

[0048] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0049] Such as figure 1 As shown, it is a schematic flowchart of a current sharing control method provided by an embodiment of the present invention, and the method is used to realize the operation control of a single-phase inverter parallel system. to combine figure 2 , the above-mentioned single-phase inverter parallel system includes a plurality of single-phase inverters (for example, there are M units, and M≥2) and a signal transmission device (parallel bus), the method includes in each single-phase inverter The following steps are performed on:

[0050] Step S1: According to the samplin...

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Abstract

The invention provides a current sharing control method and a single-phase inverter parallel system, and the method comprises the following steps executed on each single-phase inverter: a, sampling anoutput current instantaneous value of a local machine in real time according to a sampling period, and calculating an output active current effective value and an output reactive current effective value, wherein the sampling period is smaller than the power frequency period; b, calculating an average instantaneous output current, an average output active current effective value and an average output reactive current effective value; c, obtaining an instantaneous voltage outer loop given compensation amount, a voltage effective value compensation amount and a phase adjustment amount; and d, adjusting a PWM driving signal output to a power unit according to the instantaneous voltage outer loop given compensation amount, the voltage effective value compensation amount and the phase adjustment amount. The method can quickly respond when the single-phase inverter is suddenly loaded and unloaded dynamically, and the current sharing performance of a parallel system is improved.

Description

technical field [0001] The invention relates to the field of power supply, and more specifically, to a current sharing control method and a single-phase inverter parallel connection system. Background technique [0002] With the development of power electronics technology, various power conversion technologies have made great progress, and the use of inverters can effectively solve the problem of power supply quality. [0003] In some application-critical equipment or occasions requiring uninterrupted power supply, if the inverter module fails, it will cause the interruption of the power supply of subsequent load equipment. For this reason, an inverter parallel system has emerged, which includes multiple parallel-connected inverters. When supplying power to load equipment, all inverters in the inverter parallel If the inverter fails, it can automatically exit the inverter parallel system, and other inverters continue to supply power to the load equipment without affecting t...

Claims

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Application Information

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IPC IPC(8): H02M7/493
CPCH02M7/493
Inventor 谢力华张学杰
Owner SHENZHEN ECOWATT POWER
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