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Power decoupling method and device for grid-connected inverter

A power decoupling and inverter technology, applied in the field of decoupling method and decoupling device for grid-connected inverter output power, can solve the problems of lack of decoupling method and insufficient attention

Active Publication Date: 2017-06-09
DELTA ELECTRONICS (SHANGHAI) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This problem has not attracted enough attention, and there is also a lack of effective decoupling methods

Method used

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  • Power decoupling method and device for grid-connected inverter
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  • Power decoupling method and device for grid-connected inverter

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Embodiment Construction

[0078] Herein, the detailed content and technical description of the present invention will be further described with a preferred embodiment, but it should not be construed as a limitation to the implementation of the present invention.

[0079] The present invention provides a technical solution aimed at decoupling the output power of grid-connected inverters, the principle of which is as follows Figure 2-8 shown. The comparison results between the inverter using this method and the inverter using the traditional control method are shown in Fig. 9 and Fig. 10 . Figure 9A and Figure 10A It shows the situation when the command of active power changes, and it can be seen that the technical solution of the present invention can well suppress the fluctuation of reactive power; Figure 9B and Figure 10B It shows the situation when the reactive power command changes, and it can also be found that the technical solution proposed by the present invention can well suppress the f...

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Abstract

The invention discloses a power decoupling method and device for a grid-connected inverter. The power decoupling method comprises the following steps: step one, obtaining a voltage amplitude control command E <*> and a voltage phase control command theta<*> of an inverter based on an output voltage v and an output current i of the inverter; step two, according to a grid voltage amplitude, the output voltage amplitude of the inverter and a phase difference between the output voltage of the inverter and a grid voltage, obtaining an amplitude feedforward value and a phase feedforward value; step three, obtaining a reference voltage amplitude according to the voltage amplitude control command and the amplitude feedforward value of the inverter, and obtaining a reference voltage phase according to the voltage phase control command and the phase feedforward value of the inverter; and step four, adjusting an output power of the inverter by using the reference voltage amplitude and the reference voltage phase.

Description

technical field [0001] The invention belongs to the technical field of grid-connected inverter control, and in particular relates to a decoupling method and a decoupling device for output power of a grid-connected inverter. Background technique [0002] With the deepening of the environmental and energy crisis, new energy power generation has received more and more attention and application, and the grid-connected inverter is an indispensable interface device for the new energy power generation system to transmit electric energy to the grid. The performance of the inverter will have an important impact on the stability of the power generation system and the grid. The fluctuation of the output power of the grid-connected inverter will reduce the efficiency of energy utilization, and in severe cases may cause the power grid to fluctuate or even be paralyzed. [0003] According to different control methods, grid-connected inverters can be divided into two types: current contro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/48H02J3/50
CPCH02J3/48H02J3/50
Inventor 刘进军刘宝谨刘增武腾王施珂
Owner DELTA ELECTRONICS (SHANGHAI) CO LTD