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Adaptive grid-connected inverter control method based on dynamic power grid resonant frequency identification

A technology of resonant frequency and control method, which is applied in the direction of output power conversion devices, electrical components, single-grid parallel feeding arrangements, etc., and can solve problems such as power system oscillation and grid resonance.

Active Publication Date: 2013-12-25
北京能高普康测控技术有限公司
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Problems solved by technology

This control method can ensure the stability of the DC voltage of the intermediate energy storage link of the grid-connected inverter, that is, the DC side input power is directly connected to the grid in real time, but when considering that the DC side input power of the grid-connected inverter may contain some specific frequency domain components, these specific frequency domain component signals may cause the resonance of the power grid link after direct grid connection, resulting in power system oscillation

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  • Adaptive grid-connected inverter control method based on dynamic power grid resonant frequency identification
  • Adaptive grid-connected inverter control method based on dynamic power grid resonant frequency identification
  • Adaptive grid-connected inverter control method based on dynamic power grid resonant frequency identification

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Embodiment Construction

[0017] For power systems, whether it is frequency resonance caused by grid-connected active power or voltage resonance caused by grid-connected reactive power, there may be multiple resonance frequencies at the same time, such as figure 2 The corresponding active band-stop filters are shown in , reactive bandstop filter can be designed as follows:

[0018] The band-stop filter can be designed as a series of second-order Butterworth band-stop filters:

[0019]

[0020] In the formula

[0021] Indicates the number of resonance frequencies of the system, is a positive integer;

[0022] Indicates the power system a resonant frequency;

[0023] Indicates that the grid-connected power causes the first Harmonic multiples of a resonant frequency resonance;

[0024] means for the The pass-band gain of the band-stop filter designed with a resonant frequency;

[0025] means for the The pass quality factor of the band-stop filter designed with a resonant fr...

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Abstract

The invention discloses an adaptive grid-connected inverter control method based on dynamic power grid resonant frequency identification. In view of the fact that power grid resonance may be caused when direct-current input power is directly grid-connected in a traditional grid-connected inverter control method, resonant frequency of power grid frequency caused by grid-connected active power and resonant frequency of power grid voltage caused by grid-connected passive power are dynamically identified, and parameters of a grid-connected inverter controller are dynamically optimized to optimally control grid-connected active current and grid-connected passive current so as to ensure that grid-connected power does not cause power grid resonance, and adaptive control and adjustment is carried out with the change of power grid load and parameters. The method can effectively improve the quality of grid-connected power and reduce negative impact of volatility and randomness of distributed energy supply to the stability of a power grid.

Description

technical field [0001] The invention belongs to the field of power electronics, and in particular relates to an adaptive grid-connected inverter control method based on dynamic identification of grid resonance frequency. Background technique [0002] A grid-connected inverter is a power electronic device that converts DC power into industrial frequency AC power. Grid-connected inverters are currently widely used in many distributed energy supply links such as wind power generation and photovoltaic power generation. [0003] When distributed energy is supplied, the grid-connected power quality and energy fluctuations of each grid access point will have an impact on the grid link, which will lead to grid paralysis in severe cases. Therefore, the research and improvement of grid-connected inverter control performance has become an important issue in recent years. Research hotspot in the field of power electronics. [0004] At present, the method that has been maturely applied...

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Application Information

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IPC IPC(8): H02J3/38H02M1/14
Inventor 贾利民刘展童亦斌
Owner 北京能高普康测控技术有限公司
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