Microgrid one-button smooth switching control method from grid connection to off-grid mode

A technology of smooth switching and control methods, applied in the field of microgrid, can solve the problems of complex control process and high quality requirements of operators, and achieve the effect of simplifying control process, ensuring reliability, smooth and off-grid switching

Active Publication Date: 2014-05-14
NARI TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that the current micro-grid grid-connected to off-grid control process is complicated, the quality of operators is high, and the complicated operation process also increases the risk of misoperation

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  • Microgrid one-button smooth switching control method from grid connection to off-grid mode

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Embodiment Construction

[0057] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0058] like figure 1 As shown in the figure, the specific control implementation process of the one-key grid-connected to off-grid operation in the above-mentioned microgrid includes the following steps:

[0059] Step 1: The expert library is automatically loaded when the microgrid stability coordination control device is powered on.

[0060] In the second step, the microgrid stability coordination control device performs self-matching with the network topology of the expert database according to the collected value of the switching signal, and completes the preprocessing of the control strategy.

[0061] In the third step, when the microgrid stability coordination control device receives the one-click off-grid control command, it executes the preprocessed strategy library.

[0062] Step 4, the microgrid stability coordination control device ...

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Abstract

The invention discloses a microgrid one-button smooth switching control method from grid connection to an off-grid mode. The method comprises the steps that when a microgrid stable coordination control device is powered, an expert database based on XML in an internal storage is automatically loaded, self-recognition of a microgrid operation mode is carried out to complete preprocessing of a control strategy, after an operator starts a one-button control button, a preprocessed strategy control procedure is started, the whole control procedure automatically achieves error prevention control over a physical layer and a control layer, and after a power threshold condition is detected to be met, a grid connection point switch is controlled to be cut off, and smooth switching from grid connection to the off-grid mode is achieved. The method effectively solves the problems that currently, the control procedure from grid connection to the off-grid mode of a microgrid is complex, the requirement for the quality of operators is high, and the complex operation procedure increases the misoperation risk. Intensification, convenience and automation of the microgrid are achieved, operation and maintenance cost are lowered, and operation reliability is improved through misoperation prevention.

Description

technical field [0001] The invention belongs to the technical field of microgrids, and in particular relates to a one-key control method for realizing the smooth switching of islands in grid-connected to off-grid plans. Background technique [0002] A microgrid is a group of system units consisting of micropower sources, loads, energy storage systems and control devices. It is an autonomous system that can realize self-control, protection and management. The microgrid can be connected to the external grid or run in an island. [0003] At present, the grid-connected to off-grid control of the planned island of the microgrid adopts the step-by-step remote control method. Because the microgrid, especially the large-capacity microgrid with multiple micro-sources and multiple energy storages, needs to select the master-slave PCS according to the different operation modes. Considering various conditions such as energy storage, the stability margin of micro-sources, and the import...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
Inventor 唐成虹杨志宏王劲松
Owner NARI TECH CO LTD
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