Microgrid voltage type self-synchronizing inversion device and method with voltage perturbation estimator

A technology of an inverter device and a micro-grid, applied in the field of micro-grid, can solve the problems of affecting the phase-locking accuracy of a phase-locked loop, affecting the effect of quasi-synchronization control, affecting the effect of system control, etc.

Inactive Publication Date: 2015-05-27
NORTHEASTERN UNIV +1
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Problems solved by technology

[0004] As the most critical part of the grid-connected control, the performance of the phase-locked loop directly affects the control effect of the entire system, and even affects the stability of the system. Since both the phase-locked loop control system and the microgrid system are nonlinear, it is difficult to adjust The control parameters of the phase-locked loop are used to achieve satisfactory

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  • Microgrid voltage type self-synchronizing inversion device and method with voltage perturbation estimator
  • Microgrid voltage type self-synchronizing inversion device and method with voltage perturbation estimator
  • Microgrid voltage type self-synchronizing inversion device and method with voltage perturbation estimator

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Embodiment Construction

[0064] An embodiment of the present invention will be further described below in conjunction with the accompanying drawings.

[0065] Such as figure 1 As shown, the micro-grid voltage-type self-synchronous inverter device with a voltage perturbation estimator includes a main circuit, a voltage transformer, a current transformer, a control circuit and a driving circuit, and the voltage transformer and the current transformer are arranged on the main The output end of the circuit, the output end of the voltage transformer is connected to the first input end of the control circuit, the output end of the current transformer is connected to the second input end of the control circuit, the output end of the control circuit is connected to the input end of the drive circuit, the drive circuit The output terminal is connected to the input terminal of the main circuit;

[0066] In the embodiment of the present invention, the voltage transformer adopts PE2815-I-9V, and the current tran...

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Abstract

The invention relates to a microgrid voltage type self-synchronizing inversion device and method with a voltage perturbation estimator, and belongs to the technical field of microgrids. According to the device and the method, a microgrid inverter can automatically track the amplitude value, frequency and phase angle of grid voltage during grid connection, and the traditional phase-locked loop is not needed, so that the impact current at the moment of grid connection is avoided, and the regulation time can be shortened. When the inverter accesses the microgrid, the self-synchronization operation of the voltage type inverter is realized, and the control effect of plug and play is realized.

Description

technical field [0001] The invention belongs to the technical field of micro-grids, and in particular relates to a micro-grid voltage-type self-synchronous inverter device and method with a voltage perturbation estimator. Background technique [0002] Microgrid is a small power supply and distribution network composed of multiple distributed generation units, multiple inverters, multiple energy storage units and multiple loads, which can realize self-control and self-management; in microgrid, due to the large amount of wind energy The instant insertion and removal of solar power generation units lead to relatively large randomness and fluctuation of electric energy in the micro-grid, and the parameters and structure of the micro-grid have great uncertainty; generally speaking, the capacity of the micro-grid is relatively small, and the inertia is also large. It is relatively small, and the dynamic response is relatively fast. It is a weak grid structure. Therefore, when the ...

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Application Information

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IPC IPC(8): H02J3/38
CPCH02J3/40H02M7/53871
Inventor 闫士杰张化光高文忠张炳义王旭刘秀翀褚恩辉张新帅
Owner NORTHEASTERN UNIV
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