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Control method and system for switching grid-connected and off-grid operation modes of micro-grid vehicle

A technology of off-grid operation and mode switching, which is applied in the direction of single-network parallel feeding arrangement, etc., can solve the problems of large voltage variation, unbalanced power distribution, and large impact impact at the moment of off-grid switching, so as to reduce the impact current , Guarantee the quality of power supply and ensure the effect of safe and reliable operation

Pending Publication Date: 2022-03-25
YANTAI POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The inventors of the present disclosure found that the current microgrid mainly has the following problems: the voltage variation range is too large when the load changes in the off-grid state, the power cannot be distributed in a balanced manner, and the impact of the moment of switching from the grid to the off-grid is too large, etc.

Method used

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  • Control method and system for switching grid-connected and off-grid operation modes of micro-grid vehicle
  • Control method and system for switching grid-connected and off-grid operation modes of micro-grid vehicle
  • Control method and system for switching grid-connected and off-grid operation modes of micro-grid vehicle

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A control method for switching a micro-grid vehicle into and off-grid operation mode, comprising:

[0059] Use the primary frequency modulation control strategy and the voltage compensation control strategy to control the microgrid running in an isolated island;

[0060] Enter the pre-synchronization adjustment link, adopt the secondary frequency modulation strategy and phase adjustment strategy to adjust the microgrid;

[0061] When the frequency and phase of the inverter and the grid are consistent, the grid is connected.

[0062] In this embodiment, the voltage compensation control strategy is an AC bus voltage non-deviation control strategy, including:

[0063] The compensation item is added in the droop control expression, so that the voltage deviation converges to 0 within a limited time, and when the load changes suddenly, the AC bus terminal voltage is always maintained at the rated value.

[0064] In this embodiment, the secondary frequency regulation strategy ...

Embodiment 2

[0146] This embodiment provides a control system for switching microgrid vehicles into and off-grid operation modes, including an island operation control module, a pre-synchronization adjustment module, and a grid-connection control module;

[0147] The island operation control module is configured to: use a primary frequency modulation control strategy and a voltage compensation control strategy to control the island operation microgrid;

[0148] The pre-synchronization adjustment module is configured to: enter the pre-synchronization adjustment link, adopt the secondary frequency modulation strategy and the phase PI adjustment strategy to adjust the microgrid;

[0149] The grid-connection control module is configured to perform grid-connection when the frequency and phase of the inverter and the grid are consistent.

Embodiment 3

[0151] This embodiment provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the steps of the control method for switching between microgrid vehicles and off-grid operation modes described in Embodiment 1 are implemented.

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Abstract

The invention provides a microgrid vehicle grid-connected and off-grid operation mode switching control method and system, and the method comprises the steps: carrying out the control of a microgrid in isolated island operation through a primary frequency modulation control strategy and a voltage compensation control strategy; entering a pre-synchronization adjustment link, and adjusting the micro-grid by adopting a secondary frequency modulation strategy and a phase adjustment strategy; when the frequency and the phase of the inverter are consistent with those of the power grid, grid connection is carried out; according to the method, analysis is carried out for load conversion and grid-connected and off-grid switching in the micro-grid, a pre-synchronization link is added into a grid-connected system, power loop parameters are designed, the current of the power grid is controlled, the power supply quality is ensured, then a simulation model is built in Matlab / Simulink, and a control scheme is verified.

Description

technical field [0001] The disclosure belongs to the technical field of micro-grid control, and in particular relates to a control method and system for switching between micro-grid vehicles and off-grid operation modes. Background technique [0002] At present, the microgrid has become an important auxiliary means to solve many problems in the power system; with the increasing number of distributed generators in the power grid and the advancement of technology, the load on the power grid is also increasing, and the distributed and small-capacity power generation technology It has begun to attract people's attention and become an important force for development. [0003] The inventors of the present disclosure have found that the current microgrid mainly has the following problems: the voltage variation range is too large when the load changes in the off-grid state, the power cannot be distributed in a balanced manner, and the impact of the moment of switching from the grid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/46
CPCH02J3/38H02J3/46
Inventor 陶彦融孙树敏高世琰李彦澄刘俊旭邵华强刘洋梁雯谢博樊将李小帆
Owner YANTAI POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER