Integrally-controlled high-voltage cascade energy storage device

Abstract

The utility model discloses an integrated control high-voltage cascade energy storage device, which comprises an integrated main controller and three single-phase energy storage mechanisms, and the three single-phase energy storage mechanisms adopt a chain type three-phase star topology structure. Each single-phase energy storage mechanism is formed by cascading a plurality of PCS power modules, the direct current sides of the PCS power modules are connected with battery clusters in parallel, and each battery cluster is composed of a plurality of battery packs; the controlled end of each battery pack is connected with one single battery management unit, each energy storage chain link is controlled by one integrated cluster unit control module, and information interaction is carried out between each integrated cluster unit control module and the integrated main controller through an optical fiber ring network. According to the utility model, the information interaction between the battery cluster and the power unit and between the integrated cluster unit control module and the integrated main controller is realized, the control logic of the information interaction between the control part of the power conversion system PCS and the battery management system BMS is simplified, the response speed is improved, and the stable operation of the energy storage device is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage converters, in particular to a high-voltage cascade energy storage device. Background Art

[0002] With the continuous access to new energy power stations such as photovoltaic and wind power, the power system has an increasing demand for energy storage devices. New energy power stations can reduce the output fluctuation of new energy power stations through the charging and discharging regulation of energy storage systems; on the other hand, by calculating the deviation between the output of new energy and the output of the dispatch plan, and adjusting the output of the energy storage device to compensate, the tracking plan output requirements can be met.

[0003] The high-voltage cascade energy storage system is mainly composed of battery packs, battery management system BMS, power conversion system PCS and other electrical equipment.

[0004] The PCS control part of the power conversion system and the battery management system BMS are generally designed in an independent control mode. Specifically, each power module link of the power conversion system PCS is equipped with a driver board to receive commands from the PCS main controller, control the operation of the PCS converter valve, and feedback the power module status, etc. The links and the main controller communicate through a communication system; BMS generally adopts a three-layer architecture, which is divided into a single battery management unit BMU, a battery cluster management unit BCMU and a total control unit BAMS. BMU corresponds to a group of single battery management, and a single BCMU corresponds to a battery cluster composed of multiple battery groups on a PCS power module. BCMUs communicate with BMUs through a communication system. BAMS is the general control of BMS and communicates with BCMU through a communication system.

[0005] However, there is information exchange between the PCS control part of the power conversion system and the battery management system BMS: information exchange is carried out between the PCS power module and the battery cluster management unit BCMU through communication, and information exchange is carried out between the PCS main controller and the BAMS general control unit through communication.

[0006] It can be seen that the independent control mode of the power conversion system PCS and the battery management system BMS has disadvantages such as complicated structure and many fault points. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a high-voltage cascade energy storage device with integrated control, which can integrate the joint control of the power conversion system PCS and the battery management system BMS and simplify the information interaction between the two.

[0008] In order to solve the above technical problems, the technical solutions adopted by the present utility model are as follows.

[0009] An integrated controlled high-voltage cascade energy storage device comprises single-phase energy storage mechanisms respectively connected to three-phase busbars and an integrated main controller for coordinating and controlling the collaborative work between the three single-phase energy storage mechanisms, wherein the three single-phase energy storage mechanisms adopt a chain-type three-phase star topology structure; each single-phase energy storage mechanism is formed by cascading a number of PCS power modules, wherein the DC side of the PCS power modules is connected in parallel to a battery cluster, wherein each battery cluster is composed of a number of battery groups; each controlled end of each battery group is respectively connected to a single battery management unit, wherein each PCS power module and the battery cluster connected thereto form an energy storage chain link, wherein an energy storage chain link is controlled by an integrated cluster unit control module, and information is exchanged between each integrated cluster unit control module and the integrated main controller via an optical fiber ring network.

[0010] Preferably, the integrated cluster unit control modules in each single-phase energy storage mechanism are connected in cascade form, one end of the last integrated cluster unit control module is connected to the integrated main controller, and the other end of the integrated main controller is directly connected to the first integrated cluster unit control module in each single-phase energy storage mechanism.

[0011] Due to the adoption of the above technical scheme, the technical progress achieved by the present invention is as follows.

[0012] The structure and control logic of the utility model are relatively simple, wherein the integrated cluster unit control module integrates the PCS power module control part and the battery cluster management unit BCMU, which can not only manage the battery cluster, but also control the valve group of the PCS power module, and can also control the collection of the chain link analog quantity and the switch quantity, further realizing the information interaction between the battery cluster and the power unit and the integrated cluster unit control module and the integrated main controller, simplifying the control logic of the information interaction between the PCS control part of the power conversion system and the battery management system BMS, improving the response speed, reducing the failure rate, ensuring the stable operation of the energy storage device, and reducing the construction and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the topological structure of the utility model. DETAILED DESCRIPTION

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] An integrated controlled high voltage cascade energy storage device, the topology of which is as follows Figure 1 As shown, it includes three independent single-phase energy storage mechanisms and an integrated main controller. The three single-phase energy storage mechanisms are connected to the three-phase bus in a chain three-phase star topology structure. The integrated main controller is used to coordinate and control the collaborative work between the three single-phase energy storage mechanisms.

[0016] Each single-phase energy storage mechanism is composed of several cascaded PCS power modules. A reactor La, Lb, Lc is connected in series between the first PCS power module of each single-phase energy storage mechanism and the busbar, and the last PCS power module of each single-phase energy storage mechanism is connected to a neutral point.

[0017] The DC side of each PCS power module is connected in parallel to a battery cluster, each battery cluster is composed of several battery groups. Each PCS power module and the battery cluster connected to it form an energy storage chain link.

[0018] The controlled end of each battery pack is connected to a single battery management unit BMU, and one energy storage link is controlled by an integrated cluster unit control module. Each integrated cluster unit control module and the integrated main controller exchange information through a fiber optic ring network.

[0019] In the utility model, all the integrated cluster unit control modules in each single-phase energy storage mechanism are connected end to end in a cascade form to form a ring network structure, that is, the T end of the upper integrated cluster unit control module of two adjacent integrated cluster unit control modules is connected to the R end of the next integrated cluster unit control module, and the T end of the last integrated cluster unit control module is connected to the RA, RB, and RC ends of the integrated main controller, and the TA, TB, and TC ends of the integrated main controller are directly connected to the R end of the first integrated cluster unit control module in each single-phase energy storage mechanism.

[0020] In the utility model, the integrated main controller controls each integrated cluster unit control module respectively, and each integrated cluster unit control module controls the PCS power module and each single battery management unit BMU in the corresponding energy storage link respectively, eliminating the communication between the PCS control part of the power conversion system and the battery management system BMS, and improving the response speed.

[0021] The utility model integrates the PCS control part of the power conversion system with the battery management system BMS, realizes the communication between the cascade unit and the main control by using one set of communication system, and simplifies the control logic.

Claims

1. An integrated controlled high-voltage cascade energy storage device, characterized in that: It includes single-phase energy storage mechanisms respectively connected to the three-phase bus and an integrated main controller for coordinating and controlling the collaborative work between the three single-phase energy storage mechanisms. The three single-phase energy storage mechanisms adopt a chain-type three-phase star topology structure; each single-phase energy storage mechanism is formed by cascading a number of PCS power modules, and the DC side of the PCS power module is connected in parallel to a battery cluster, and each battery cluster is composed of a number of battery groups; the controlled end of each battery group is respectively connected to a single battery management unit (BMU), and each PCS power module and the battery cluster connected thereto form an energy storage chain link, and an energy storage chain link is controlled by an integrated cluster unit control module, and each integrated cluster unit control module and the integrated main controller exchange information through an optical fiber ring network.

2. The integrated controlled high-voltage cascade energy storage device according to claim 1, characterized in that: The integrated cluster unit control modules in each single-phase energy storage mechanism are connected in cascade form, one end of the last integrated cluster unit control module is connected to the integrated main controller, and the other end of the integrated main controller is directly connected to the first integrated cluster unit control module in each single-phase energy storage mechanism.

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