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Power decoupling method for voltage controlled grid-connected inverter

A voltage-controlled, power decoupling technology, applied in the field of grid-connected inverter control research, can solve the problems of lack of decoupling methods and insufficient attention, and achieve good decoupling effect, good reference value, and simple application Effect

Inactive Publication Date: 2016-02-24
XI AN JIAOTONG UNIV
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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 for voltage controlled grid-connected inverter
  • Power decoupling method for voltage controlled grid-connected inverter
  • Power decoupling method for voltage controlled grid-connected inverter

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Embodiment Construction

[0039] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0040] The present invention provides a control method aimed at decoupling the output power of a voltage-controlled grid-connected inverter, the principle of which is as follows Figure 4 , Figure 5 and Figure 6 shown. In the simulation and experiment, the inverter using this method is compared with the inverter using the traditional control method. The results are as follows: Figure 7 shown. Figure 7 (a) represents the situation when the command of active power changes, it can be seen that the control method of the present invention can well suppress the fluctuation of reactive power; Figure 7 (b) shows the situation when the reactive power command changes, and it can also be found that the control method proposed by the present invention can well suppress the fluctuation of active ...

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Abstract

The invention discloses a power decoupling method for a voltage controlled grid-connected inverter, belonging to the field of grid-connected inverter control research. The method proposes a decoupling strategy based on feed-forward control, the magnitude of a coupling quantity of active power and reactive power is calculated in real time according to the power equation of the grid-connected inverter, and then phase angle feed-forward and amplitude feed-forward are respectively introduced into control loops of active power and reactive power to counteract coupling of power, wherein the feed-forward quantity and the coupling quantity are opposite in symbol and equal in magnitude. The method has an obvious decoupling effect, is simple and convenient in application, facilitates direct upgrade of the existing inverter, improves the performance and the stability of the grid-connected inverter, and provides good reference value for engineering application.

Description

technical field [0001] The invention belongs to the research field of grid-connected inverter control, and in particular relates to a decoupling control method for output power of a voltage-controlled 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 cont...

Claims

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/48H02J3/50
Inventor 刘进军刘宝谨刘增武腾王施珂
Owner XI AN JIAOTONG UNIV
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