CN-224233348-U - Energy storage system

CN224233348UCN 224233348 UCN224233348 UCN 224233348UCN-224233348-U

Abstract

The application provides an energy storage system, which relates to the technical field of power grid management and comprises an energy storage device, a switching device and an alternating current functional unit, wherein the energy storage device is connected with an alternating current port of the energy storage system and used for alternating current-direct current conversion and electric energy storage, the alternating current functional unit is used for providing a supporting operation function for the energy storage system, the alternating current functional unit is connected with the alternating current port through the switching device, and the switching device is used for controlling the phase change or disconnection of a power supply passage of the alternating current functional unit on a target phase. Therefore, the alternating current functional unit is used for providing a supporting operation function for the energy storage system, ensures the stability and reliability of the energy storage system in the operation process, enriches the application scene of the energy storage system, and is particularly suitable for the scene of connecting a micro-grid energy storage three-phase alternating current with a single-phase important load.

Inventors

JU KAISHI
ZHANG HAOCHEN
SUN YUNJIE
Jian Runze
LEI ZHENNING

Assignees

领充新能源科技有限公司

Dates

Publication Date: 20260512
Application Date: 20250423

Claims (8)

1. An energy storage system is characterized by comprising an energy storage device, a switching device and an alternating current functional unit; the energy storage device is connected with an alternating current port of the energy storage system and is used for alternating current-direct current conversion and electric energy storage; The alternating current functional unit is connected with the alternating current port through the switching device, and the switching device is used for controlling the phase change or disconnection of a power supply channel of the alternating current functional unit on a target phase; the switching device comprises a phase change switch, a sampling unit and a first control unit The first end of the phase change switch is used for being connected with the alternating current functional unit; The second ends of the phase change switches are respectively connected with the phases of the alternating current port in a one-to-one correspondence manner so as to switch the alternating current functional units among the phases of the alternating current port; The input end of the sampling unit is connected with the alternating current port, the output end of the sampling unit is connected with the first control unit, and a plurality of control ends of the phase change switch are connected with the first control unit and used for controlling the on-off of a power supply passage between any phase in the alternating current port and a corresponding single-phase intersecting streamline.
2. The energy storage system of claim 1, wherein the switching device comprises a plurality of commutation switches, the ac functional units are divided into a plurality of groups, each group comprising at least one ac functional unit, each commutation switch being connected to at least one ac functional unit of a group to commutate or disconnect a power supply path of the at least one ac functional unit.
3. The energy storage system of claim 2, wherein the AC function unit comprises a plurality of AC function components, and the plurality of phase change switches are connected to the plurality of AC function components in a one-to-one correspondence.
4. The energy storage system of claim 1, wherein said commutation switch is one, said ac functional unit comprises a plurality of ac functional components, said commutation switch being connected to all of said plurality of ac functional components.
5. The energy storage system of claim 1, wherein the switching device comprises a plurality of controllable switches, the ac functional units are divided into a plurality of groups, each group comprises at least one ac functional unit, one end of each controllable switch is connected to any one phase in the ac port, and the other end of each controllable switch is connected to at least one ac functional unit in a group to perform disconnection or connection at a target relative to the at least one ac functional unit.
6. The energy storage system of claim 5, wherein said switching device further comprises a single-phase power module, at least one controllable switch, a second control unit; The first end of the single-phase power supply module is connected with the alternating current port, the second end of the single-phase power supply module is connected with a corresponding single-phase intersecting streamline, the at least one controllable switch is respectively connected between the corresponding single-phase intersecting streamline and each alternating current functional unit, and the second control unit is connected with the control end of the at least one controllable switch and is used for respectively controlling the on-off of a power supply passage between each alternating current functional unit and the corresponding single-phase intersecting streamline.
7. The energy storage system of claim 1, wherein the energy storage device comprises at least two energy storage converters and a second energy storage module in parallel; the alternating current ends of the at least two energy storage converters are connected with the alternating current port, and the direct current ends of the at least two energy storage converters are connected with the power supply end of the second energy storage module.
8. The energy storage system of any of claims 1 to 7, wherein the AC function unit comprises at least one of a liquid cooling device, an air conditioning device, a fire detection device, a dehumidification device, an indicator light, a fan device.

Description

Energy storage system Technical Field The application relates to the technical field of power grid management, in particular to an energy storage system. Background With the development of power systems, low-voltage distribution networks play a key role in energy transmission and distribution. In China, a low-voltage distribution network generally adopts a 10kV/0.4kV transformer to supply power to users in a three-phase four-wire system, so that a complex power supply network for mixing three-phase production power and single-phase load power is formed. However, during actual operation, a phenomenon that three phases are unbalanced or one phase or two phases of three-phase voltages are too low occurs, which has a plurality of adverse effects on important loads in key scenes such as an energy storage system and the like. In the prior art, one scheme is to detect and monitor three-phase unbalance through an algorithm, but the algorithm has no governance capability, and once the problem is detected, equipment can only be shut down or stopped, so that service is interrupted, the other scheme is to govern an AC power grid three-phase unbalance scene, but the governance capability is limited, the governance capability is obvious for a certain phase with the largest deviation, but the AC functional unit cannot be ensured to be positioned on the optimal governance phase voltage, and one-sided performance and uncertainty exist, and the scheme is also to an electric vehicle charging station three-phase voltage automatic balance charging system, and although the problem of partial three-phase unbalance can be solved by optimizing and adjusting load power through a phase conversion device and the algorithm, the optimal output under the current governance capability can only be ensured, and the output voltage cannot be ensured to meet the normal operation requirement of the load, and especially the applicability is insufficient in the scene of connecting a single-phase important load on a micro-grid energy storage three-phase AC. Disclosure of utility model The application aims to provide an energy storage system, wherein an alternating current functional unit is used for providing a supporting operation function for the energy storage system, so that the stability and the reliability of the energy storage system in the operation process are ensured, meanwhile, the application scene of the energy storage system is enriched, and the energy storage system is particularly suitable for a scene of connecting a micro-grid energy storage three-phase alternating current with a single-phase important load. In order to achieve the above object, the technical scheme adopted by the embodiment of the application is as follows: In a first aspect, the embodiment of the application provides an energy storage system, which comprises an energy storage device, a switching device and an alternating current functional unit, wherein the energy storage device is connected with an alternating current port of the energy storage system and is used for alternating current-direct current conversion and electric energy storage; The alternating current functional unit is connected with the alternating current port through the switching device, and the switching device is used for controlling the phase change or disconnection of a power supply path of the alternating current functional unit on a target phase. Optionally, the switching device comprises a commutation switch; the first end of the phase change switch is used for being connected with the alternating current functional unit; The second ends of the phase change switches are respectively connected with the phases of the alternating current port in a one-to-one correspondence mode so as to switch the alternating current functional units among the phases of the alternating current port. Optionally, the switching device further comprises a sampling unit and a first control unit, wherein the input end of the sampling unit is connected with the alternating current port, the output end of the sampling unit is connected with the first control unit, and a plurality of control ends of the phase change switch are connected with the first control unit and used for controlling the on-off of a power supply path between any phase in the alternating current port and a corresponding single-phase intersecting streamline. Optionally, the switching device comprises a plurality of phase change switches, the alternating current functional units are divided into a plurality of groups, each group comprises at least one alternating current functional unit, and each phase change switch is connected with at least one group of alternating current functional units in one group so as to perform phase change or disconnection on a power supply path of the at least one group of alternating current functional units. Optionally, the alternating current functional unit comprises a plurality of alternating current functional c