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Micro-grid system being capable of grid-connected and off-grid operation, and energy control method

An off-grid operation and energy control technology, which is applied in the direction of AC network circuits, single-network parallel feeding arrangements, electrical components, etc., can solve problems such as difficult operation, difficult to meet user safety and reliability requirements, and high cost

Active Publication Date: 2014-03-19
XIAN HIGH VOLTAGE APP RES INST CO LTD
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Problems solved by technology

However, the centralized large power grid also has some disadvantages: high cost, difficult operation, difficult to meet the increasingly high safety and reliability requirements of users

Method used

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  • Micro-grid system being capable of grid-connected and off-grid operation, and energy control method
  • Micro-grid system being capable of grid-connected and off-grid operation, and energy control method
  • Micro-grid system being capable of grid-connected and off-grid operation, and energy control method

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Embodiment Construction

[0027] 1. Microgrid system

[0028] see figure 1 As shown, the present invention provides a microgrid system and energy control method that can be used for grid-connected and off-grid operations. The microgrid system is mainly composed of solar panels for photovoltaic power generation and wind turbines for wind power generation. , energy storage system, grid-connected solid-state switch (PCC switch) and corresponding control and protection devices and control devices. The entire microgrid system is mainly based on the AC bus, and the DC bus is reserved, and there is no load for the time being. And build the internal communication network of the system.

[0029] The main components of the micro-grid system include: distributed energy generation system, used to generate electric energy; energy storage system, used to store and provide energy; PCC switch, to realize the grid connection and separation of micro-grid and large grid; load controller, Control the load; the central ...

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Abstract

The invention provides a micro-grid system being capable of grid-connected and off-grid operation, and an energy control method. The micro-grid system comprises a distribution type energy power generation system, an energy storage system, a PPC switch, a central controller, an energy control device, a load controller and a load. The distribution type energy power generation system is connected onto an AC bus via a converter or a controller and used for generating electric energy. The energy storage system is connected onto the AC bus via a PCS and used for storing and providing energy. The PCC switch is used for realizing connection and disconnection of the micro-grid system and an external network and detecting the grid state and realizing seamless switching of grid-connected and off-grid motions. Information interaction is realized between the central controller and the distribution type energy power generation system, the energy storage system and the load controller via a CAN bus. Information interaction is realized between the energy control device and the distribution type energy power generation system, the energy storage system and the central controller via an Ethernet. The load controller is used for detecting load power and feeding the load power state to the energy control device and receiving a switching load instruction of the energy control device. The load is connected onto the AC bus via the load controller.

Description

Technical field: [0001] The invention relates to the technical field of distributed power generation micro-grids in electric power systems, in particular to a micro-grid system and an energy control method for grid-connected and off-grid operations. Background technique [0002] With the continuous growth of power demand, the advantages of the large power grid in the past few decades have enabled it to develop rapidly and become the main power supply channel. However, the centralized large power grid also has some disadvantages: high cost, difficult operation, and difficult to meet the increasingly high safety and reliability requirements of users. With the application of new technologies, especially the development of power electronic interface and modern control theory, the concept of microgrid has emerged. Compared with the traditional centralized energy system, the micro-grid is close to the load and does not need to build a large power grid for long-distance high-volta...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/38H02J3/24
Inventor 武星赵阳杰朱一昕宫芳涛
Owner XIAN HIGH VOLTAGE APP RES INST CO LTD
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