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Grid-connected control method of inverter based on fuzzy control and virtual synchronous generator

A virtual synchronization and fuzzy control technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as the inability of the system to run stably, achieve faster corresponding speed and steady-state accuracy, suppress system resonance peaks, and fast dynamic response. performance effect

Active Publication Date: 2020-04-07
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

[0004] From the analysis of system stability, it is concluded that the single-loop control based on grid-connected current cannot make the system run stably, so a double-loop control system is proposed

Method used

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  • Grid-connected control method of inverter based on fuzzy control and virtual synchronous generator
  • Grid-connected control method of inverter based on fuzzy control and virtual synchronous generator
  • Grid-connected control method of inverter based on fuzzy control and virtual synchronous generator

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Embodiment Construction

[0052] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0053] Such as figure 1 As shown, the grid-connected inverter system includes sequentially connected DC input voltage sources U dc , three-phase inverter (switching tubes Q1-Q6) and LCL filter (inverter side inductance L1, filter capacitor C and load side inductance L2), and a detection transmitter for detecting voltage and current, where e a 、e b 、e c is the output voltage of the inverter side in the three-phase stationary coordinate system, i a i b i c is the inverter side output current in the three-phase static coordinate system, u ga , u gb , u gc is the grid-connected v...

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Abstract

The invention relates to an inverter grid-connection control method based on fuzzy control and a virtual synchronous generator. The method comprises the following steps: S1, obtaining a phase angle and potential of the virtual synchronous generator based on a virtual synchronous generator technique according to inverter side output voltage, inverter side output current and grid-connection voltage; S2, obtaining reference current of a current loop based on a proportional-integral control voltage feedback loop according to the potential of the virtual synchronous generator obtained in the step S1 and collected filter capacitor voltage; S3, obtaining three-phase modulation wave based on fuzzy control and the proportional-integral control voltage feedback loop according to the reference current of the current loop obtained by the step S2 and collected filter capacitor current; and S4, comparing the three-phase modulation wave with carrier wave to obtain six switching signals and controlling switching-off and switching-on of an inverter. Compared with the prior art, the stable speed of a system is improved under the premise of ensuring system stability, so that the system has better performance.

Description

technical field [0001] The invention relates to the field of inverter control, in particular to an inverter grid-connected control method based on fuzzy control and a virtual synchronous generator. Background technique [0002] With the rapid development of the economy, the global energy crisis and environmental problems are increasingly intensified. At the same time, traditional energy sources such as coal and oil have aggravated environmental pollution. Therefore, distributed power generation for the rational application of new energy sources has received more and more attention. Since most distributed energy sources are connected to the grid through inverters, the research on inverter control technology is particularly important. With the research and application of more control methods, some more advanced control strategies are gradually applied in the system. Among them, intelligent control is more and more widely used. [0003] The virtual synchronous generator is b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/40H02J3/38
CPCH02J3/382H02J3/40
Inventor 杨旭红薛冰
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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