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Inverter control method and system

An inverter and loop control technology, applied in the field of power electronics, can solve the problems of complex control of three-phase four-wire inverters with unbalanced loads, and achieve precise voltage output and simple control methods

Active Publication Date: 2014-12-03
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention provides an inverter control method and system to solve the problem in the prior art that the three-phase four-wire inverter has the ability to carry unbalanced loads and requires complex control. The specific solution as follows:

Method used

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  • Inverter control method and system

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Embodiment Construction

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. 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.

[0031] The invention discloses an inverter control method, the flow chart of which is as follows figure 1 shown, including:

[0032] Step S11, determining the closed-loop transfer relationship between the output voltage of the inverter and a given voltage and load current;

[0033] The inverter is controlled by the given voltage input to the controller. The given voltage is converted into the output value of the controller through the controller. The output v...

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Abstract

The invention discloses an inverter control method and system. The method comprises the steps that due to the facts that a relational expression between an output voltage and a load current is determined and a load current feedforward coefficient is introduced, the output voltage obtained after the load current feedforward coefficient is introduced is not affected by the load current, and then an inverter is controlled. Due to the fact that the inverter is controlled by adopting an output value obtained after the load current feedforward coefficient is introduced, the inverter has the capacity of carrying unbalance loads; due to the fact that only one load current feedforward coefficient needs to be introduced according to the scheme, the control mode is simple, no complex processes are needed, and the inverter can have the accurate voltage output under the situation that the inverter carries any unbalance load.

Description

technical field [0001] The present invention relates to the field of power electronics, in particular to an inverter control method and system. Background technique [0002] At present, in order to make the three-phase four-wire inverter capable of carrying unbalanced loads, two methods are usually adopted: one is phase-splitting control, by introducing effective value control required by single-phase control, repetitive control or other methods based on The control strategy of the internal model principle ensures the accuracy of the output voltage, but it needs to introduce more parameters, and the control is more complicated; [0003] The other is positive and negative sequence dual-axis control, which requires more complex parameter conversion and calculation. When the negative sequence component of the load balance output voltage is small, it may be affected by introducing unnecessary negative sequence components through the negative sequence controller. Output voltage,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/42
Inventor 刘宝其张彦虎柳萌薛丽英胡兵
Owner SUNGROW POWER SUPPLY CO LTD
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