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A realization method of high-bandwidth multifunctional grid-connected inverter

An implementation method and inverter technology, which are applied in the output power conversion device, the conversion of AC power input to DC power output, and the AC network circuit, etc. Power density, reduction in size and weight

Active Publication Date: 2021-09-21
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Since grid-connected inverters mostly use digital control, the 1.5-beat digital control delay introduced by it will cause inverters with different control methods to have a specific stable range, which will affect the wide-range stability of grid-connected inverters under weak grids. Robustness to Variable Grid Impedance

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  • A realization method of high-bandwidth multifunctional grid-connected inverter
  • A realization method of high-bandwidth multifunctional grid-connected inverter
  • A realization method of high-bandwidth multifunctional grid-connected inverter

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Embodiment Construction

[0026] The invention will be described in further detail below in conjunction with the accompanying drawings.

[0027] The single-phase full-bridge circuit topology of the high-bandwidth multifunctional grid-connected inverter involved in the present invention is as follows: figure 1 As shown, four of the power switch tubes use new wide-bandgap GaN devices to obtain higher switching frequency, which effectively reduces the volume and weight of the grid-connected inverter, that is, realizes the miniaturization and portability of the grid-connected inverter. This is one of the functions of the high bandwidth multifunctional grid-connected inverter. Adopt unipolar frequency doubling SPWM control. The LCL filter method is used to better filter out high-frequency harmonics and relatively reduce the size of the filter. In view of the weak grid background in practical applications, the worst case of grid impedance is considered in the analysis, and it is regarded as a pure inductan...

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Abstract

The invention discloses a method for realizing a high-bandwidth multifunctional grid-connected inverter, which belongs to the field of DC-AC converters of electric energy conversion devices. The switching tube of this high-bandwidth grid-connected inverter selects a new type of wide-bandgap switching device, which can effectively reduce the volume and weight of the system and achieve high efficiency and high power density. The high bandwidth characteristic of the grid-connected inverter makes its equivalent output impedance present a positive resistance property in a wide range, and has a damping effect on the low-frequency resonance under the current weak grid. The invention uses a parallel connection method to connect the high-bandwidth grid-connected inverter with the original low-frequency inverter cluster system. As a grid-connected module of the multi-machine system, it can also effectively inject power into the system. The invention can simultaneously realize the three functions of miniaturization of the high-bandwidth grid-connected inverter, resonance suppression and power injection.

Description

technical field [0001] The invention relates to a method for realizing a high-bandwidth multifunctional grid-connected inverter, which belongs to the field of DC-AC converters of electric energy conversion devices. Background technique [0002] Distributed power generation is currently the most important way to develop renewable energy represented by solar energy and wind energy. As an energy exchange interface between renewable energy and the grid, the inverter is crucial to the stable and reliable operation of the system. Since grid-connected inverters mostly use digital control, the 1.5-beat digital control delay introduced by it will cause inverters with different control methods to have a specific stable range, which will affect the wide-range stability of grid-connected inverters under weak grids. Robustness to variable grid impedance. Currently existing solutions mainly include reducing the influence of digital control delay and correcting the output impedance of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02M1/12H02J3/38
CPCH02J3/381H02M1/126H02M7/53871H02J2203/20H02M1/0038Y02B70/10
Inventor 方天治沈姝衡张惠丽张雨
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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