Starting method of energy storage system comprising internal power supply cascade type power module

A power module and internal power supply technology, which is applied in the field of energy storage system start-up, can solve problems such as the inability to use the energy storage system, the failure of the power grid to work normally, and the inability to black-start the energy storage system.

Pending Publication Date: 2022-08-09
SHENZHEN HOPEWIND ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The start-up control of the energy storage system in the prior art is performed through an external power supply, and it is impossible to accurately and flexibly select the start-up mode of the energy storage system, resulting in the inability to better use the energy storage system in complex working conditions. If the power grid fails to work normally, black start cannot be performed through the energy storage system

Method used

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  • Starting method of energy storage system comprising internal power supply cascade type power module
  • Starting method of energy storage system comprising internal power supply cascade type power module
  • Starting method of energy storage system comprising internal power supply cascade type power module

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Embodiment 1

[0025] see Figure 1 to Figure 3 , figure 1 It is an overall control diagram of an energy storage system startup method including an internal power supply cascade type power module according to the present invention, figure 2 It is an overall structure diagram of an internal power supply cascade type power module of an energy storage system startup method including an internal power supply cascade type power module according to the present invention, image 3 It is an overall structure diagram of an energy storage system including an energy storage system startup method of an internal power supply cascade type power module according to the present invention;

[0026] This embodiment discloses a startup method of an energy storage system including an internal power supply cascade type power module. The energy storage power module 1 includes a bidirectional conversion device 11 , an energy storage battery device 14 , a switching power supply 16 , a filter device 12 , and a swi...

Embodiment 2

[0029] see figure 1 , figure 1 This is an overall control diagram of a start-up method of an energy storage system including an internal power supply cascade type power module of the present invention. This embodiment is a different control situation of the first embodiment: it is judged whether the power grid is operating normally, and if the power grid cannot operate normally , the energy storage system is started in the black start mode through the internal power supply cascade type power module 1: the switch K1 is closed, the energy storage battery device 14 supplies power to the bidirectional conversion device and the energy storage battery device through the switching power supply 16, and the battery management system The unit 141 confirms that the energy storage battery device 14 reaches the grid-connected charging and discharging conditions, and closes the first soft-start switch K2. The energy storage battery device 14 charges the DC bus capacitor C1 of the bidirectio...

Embodiment 3

[0031] see figure 1 , figure 1 This is an overall control diagram of an energy storage system startup method including an internal power supply cascade type power module of the present invention. This embodiment is a different control situation of the first embodiment: judging whether the power grid is running normally, when the power grid The switch K1 is closed, the energy storage battery device 14 supplies power to the bidirectional conversion device 11 and the energy storage battery device through the switching power supply 16 , the battery management system unit 141 confirms that the energy storage battery device 14 does not meet the grid-connected discharge condition, and the energy storage battery device 14 Not participating in power deployment, the energy storage system is out of operation.

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Abstract

The invention discloses a method for starting an energy storage system comprising an internal power supply cascade type power module, which comprises the following steps of: judging whether a power grid is normally operated or not, if the power grid is normally operated, closing a switch, and charging a direct current bus capacitor by an alternating current end of a bidirectional conversion device; when the direct-current bus capacitor is charged until the voltage at the two ends reaches a numerical value I, the first soft start switch is closed, and the energy storage battery device continues to charge the direct-current bus capacitor; when the voltage at the two ends of the direct-current bus capacitor is charged to reach a numerical value 2, the second soft start switch is closed, and the voltage at the two ends of the direct-current bus capacitor is increased to be the same as the voltage at the power end of the energy storage battery device. The method can flexibly select the starting mode of the energy storage system according to the states of the power grid and the battery, can be suitable for various use conditions of the energy storage system, and effectively solves the problem of black start in the power grid.

Description

technical field [0001] The invention relates to the technical field of energy storage system control, in particular to a start-up method of an energy storage system including an internal power supply cascade type power module. Background technique [0002] With the diversified and clean development of the world's energy structure, the country is building a new advanced power system with wind energy, photovoltaic and other new energy as the main body, actively developing "new energy + energy storage", integration of source, network, load and storage and Multi-energy complements each other, and vigorously supports the rational allocation of energy storage systems for distributed new energy sources. [0003] With the development of the country's new energy layout, with the support of policies for clean energy loads, more and more heavy-duty power equipment, such as high-speed railways, electric vehicles, etc., are integrated into the power grid as loads. Such loads have the cha...

Claims

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Application Information

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IPC IPC(8): H02J3/32
CPCH02J3/32Y02E70/30
Inventor 黄晓周党生王勇胡子豪陈经国龚李伟
Owner SHENZHEN HOPEWIND ELECTRIC CO LTD
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