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Energy storage system grid-connected and off-grid switching system and switching method

A switching system and energy storage system technology, applied in the energy storage system and off-grid switching system and switching field, can solve problems such as load power failure, damaged equipment, and inability to switch working modes casually

Active Publication Date: 2021-04-27
西安新艾电气技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] When the PCS is working, it cannot switch the working mode casually. If the mains power is abnormal when it is working on the grid, the PCS has no time to detect the fault, and the PCS does not switch to the off-grid working mode. If it reports a fault and shuts down, the load may be powered off at this time.
If the PCS supplies power to the load independently when working off-grid, the load must be disconnected from the grid at this time, otherwise the mains power comes, and the output voltage of the PCS and the mains voltage are connected together under the condition of different phase amplitudes. damaged equipment

Method used

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  • Energy storage system grid-connected and off-grid switching system and switching method
  • Energy storage system grid-connected and off-grid switching system and switching method
  • Energy storage system grid-connected and off-grid switching system and switching method

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Embodiment Construction

[0037]The invention is further illustrated below with reference to the accompanying drawings:

[0038]PCS is a two-way energy storage converter, and can work with the grid and work from the grid. STS has a complete set of closed-loop control systems, including controllers, sampling, output interfaces, and external communications.

[0039]After power-on, STS determines its own working state according to the current mains and PCS working conditions.

[0040]If you work in grid mode

[0041]Step 1: STS detects the main time.

[0042]Step 2: Judging whether the main voltage frequency is abnormal or the main electricity

[0043]Step 3: Determine whether or not to switch and which switching timing is determined based on the mains of step 2.

[0044]Step 4: Control the two-stage relay and the thyristor rectifier SCR according to the switching timing determined by step 3.

[0045]Step 5: While running at step 4, send a handover command to the PCS to control its switching mode.

[0046]If you work in the network mode

[...

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Abstract

The invention discloses an energy storage system grid-connected and off-grid switching system and switching method. The system comprises a grid-connected and off-grid switching device STS and a bidirectional energy storage converter PCS, wherein the grid-connected and off-grid switching device STS comprises a controller, a thyristor SCR, a first-stage relay and a second-stage relay, a first-stage relay and a second-stage relay in the main circuit of the grid-connected and off-grid switching device STS are sequentially connected, the thyristor SCR is connected to the second-stage relay in parallel, and a controller in the control circuit of the grid-connected and off-grid switching device STS is connected with the two-stage relay and the thyristor SCR. According to the invention, the SCR is connected to the two ends of the relay in parallel, signals can be sent to the SCR and the relay at the same time when the relay is disconnected from the grid, and due to the fact that the semiconductor switch speed is high, the SCR can be switched on firstly, so that no voltage difference exists between the two sides of the relay when the relay acts, and arc discharge and relay adhesion cannot be caused when the relay is disconnected.

Description

Technical field[0001]The present invention belongs to the technical field of energy conversion technology, and in particular, to an energy storage system and a network switching system and a switching method.Background technique[0002]In recent years, with the development of electricity electronic technology, energy storage technology has received increasing attention, and is an indispensable condition in the application of microgrid, distributed power generation, and switching quickly and off the network. It is a key node to the ultimate energy storage technology. The combination of energy storage technology and advanced energy conversion and control technology can achieve peak-filled valley, improve power quality, improve grid characteristics, etc., which satisfies the demand side of the power network, and also meets the needs of the user.[0003]PCS has two working modes, grunge work mode, and network working mode. When the grid is normal, the PCS and the grid are supplied together,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J9/06H02J3/38
CPCH02J9/062H02J3/38
Inventor 张永辉李勇琦陈满胡振恺
Owner 西安新艾电气技术有限公司
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