Synchronization method for parallel-connection operation control of multiple energy storing devices of microgrid

An energy storage device and operation control technology, applied in the field of power systems, can solve problems such as micro-grid collapse and affect the stability of micro-grid operation, and achieve the effects of eliminating current shocks, realizing stable power supply, and improving stability

Active Publication Date: 2013-12-11
BEIJING SIFANG JIBAO AUTOMATION +1
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Problems solved by technology

However, how to coordinate multiple sets of energy storage devices to operate off-grid at the same time (synchronous operation) is still a bottleneck of energy storage technology
When the microgrid is

Method used

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  • Synchronization method for parallel-connection operation control of multiple energy storing devices of microgrid
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  • Synchronization method for parallel-connection operation control of multiple energy storing devices of microgrid

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Embodiment Construction

[0020] The technical solution of the present invention will be further described in detail below according to the drawings in the description and in combination with specific implementation examples.

[0021] figure 1 It is a schematic diagram of the main circuit of the present invention. Energy storage devices, loads, and synchronous controllers are connected in parallel on the AC bus of the microgrid. There is only electrical connection between each energy storage device and the load, and each energy storage device does not know the output of other devices and the size of the load, and each energy storage device operates independently. The main controller is connected to the energy storage device through a synchronous optical fiber, and sends control commands and voltage references to the energy storage device.

[0022] figure 2 Schematic diagram of the control strategy of the main controller. The main function of the main controller is to issue synchronous control comm...

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Abstract

The invention discloses a synchronization method for parallel-connection operation control of multiple energy storing devices of a microgrid. The method includes a control policy for microgrid transference from connected network to isolated network, a control policy for microgrid transference from isolated network to connected network and a microgrid isolated-network operation control policy so that a problem of asynchronization of the multiple energy storing devices in transference from connected network to off-network and from off-network to connected network, a ring current problem brought up because differences of the energy storing devices in voltage amplitude and phase angle in operation of the microgrid isolated network and a current balance problem of the energy storing devices in the operation of the microgrid isolated network to be solved effectively so that stability of the microgrid isolated network in operation is improved. In the synchronization method, energy-storing system control is effectively simplified in the operation of the microgrid isolated network through transference of closed-loop points so that the control policies have great universality, practicality and application prospect.

Description

technical field [0001] The invention belongs to the field of power systems, and more specifically relates to a micro-grid control technology including distributed power sources, which is applicable to the parallel operation control technology of multiple energy storage devices. Background technique [0002] With the development of distributed energy generation technology, microgrid has been proposed as an organizational form that can make full use of the potential of distributed energy. A microgrid is a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, related loads, monitoring and protection devices. The microgrid constitutes a controllable unit, which can realize self-control, protection and energy management, and can effectively coordinate the relationship between distributed power sources and large power grids, and realize the rapid development of power grids. [0003] The microgrid i...

Claims

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Application Information

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IPC IPC(8): H02J3/40
CPCY02P80/14
Inventor 韩健张效宇赵璐璐何岩操丰梅张涛刘树刘志超陈建卫刘坤杜金陵刘智全王立超
Owner BEIJING SIFANG JIBAO AUTOMATION
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