Valve tower control structure of laser-triggered energy-taking high-voltage cascade type energy storage system

Abstract

The utility model discloses a valve tower control structure of a laser-triggered energy-taking high-voltage cascade type energy storage system, which relates to the field of energy storage systems and comprises an external laser emitting device, a laser energy-taking device, a direct-current power supply switching device and a DC / DC (Direct Current / Direct Current) conversion device. An external laser emitting device emits laser to the laser energy taking device, the laser energy taking device is connected with the input side of the direct-current power supply switching device, the output side of the direct-current power supply switching device is connected with the H-bridge module and the PACK module controllers, and the high-voltage input side of the DC / DC conversion device is connected with the H-bridge module and the battery cluster in parallel. And the low-voltage output side of the DC / DC conversion device is connected with the input side of the power supply switching device. According to the valve tower control structure of the high-voltage cascade type energy storage system capable of obtaining energy through laser triggering, a high-insulation isolation transformer does not need to be configured, the system cost can be reduced, the overall size can be reduced, and the system energy density can be improved.

Description

Technical Field

[0001] This utility model relates to the field of energy storage system technology, and in particular to a valve tower control structure for a high-voltage cascaded energy storage system with laser-triggered energy harvesting. Background Technology

[0002] The power supply method for existing high-voltage cascaded energy storage systems, including H-bridge modules and control devices, generally adopts an isolation transformer scheme. External 380 / 220Vac mains power is isolated by a 10 / 35kV insulation level isolation transformer before being sent to each H-bridge module and control device. The power is then converted to DC power by the internal switching power supply or onboard power supply. This scheme is relatively mature and reliable. However, as grid connection voltage levels increase, reaching 110 / 220kV or even higher, the cost and size of the isolation transformers and power cables will increase significantly, the manufacturing process will become more complex, and the overall size of the energy storage system will also increase substantially. Utility Model Content

[0003] The purpose of this invention is to provide a valve tower control structure for a high-voltage cascaded energy storage system with laser-triggered energy harvesting, which eliminates the need for a high-insulation isolation transformer, thereby reducing system costs, minimizing overall size, and increasing system energy density.

[0004] To achieve the above objectives, this utility model provides a valve tower control structure for a high-voltage cascaded energy storage system with laser-triggered energy harvesting. The valve tower consists of parallel H-bridge modules and several battery clusters. Each battery cluster includes several series-connected PACK modules. Each PACK module consists of parallel PACK module controllers and battery stacks. The valve tower control structure includes an external laser emitting device, a laser energy harvesting device, a DC power switching device, and a DC / DC converter. The external laser emitting device emits laser light to the laser energy harvesting device. The laser energy harvesting device is connected to the input side of the DC power switching device. The output side of the DC power switching device is connected to the H-bridge modules and several PACK module controllers. The high-voltage input side of the DC / DC converter is connected in parallel with the H-bridge modules and battery clusters. The low-voltage output side of the DC / DC converter is connected to the input side of the power switching device.

[0005] Preferably, the laser energy harvesting device, the DC power switching device, and the DC / DC converter are installed inside the valve tower.

[0006] Preferably, the laser emitted by the external laser emitting device propagates through a medium and then irradiates the laser energy harvesting device. After receiving the laser, the laser energy harvesting device performs internal energy conversion and outputs DC control power to the DC power switching device.

[0007] Preferably, the medium is air or optical fiber.

[0008] Therefore, the valve tower control structure of the high-voltage cascaded energy storage system with laser-triggered energy harvesting of the present invention, which adopts the above-mentioned structure, has the following beneficial effects:

[0009] (1) High voltage insulation capability: The laser energy transmission replaces the traditional isolation transformer power supply. It utilizes the insulation characteristics of the laser in air or optical fiber medium, eliminating the need for complex electromagnetic isolation structures. It can withstand voltage levels of 110kV and above, solving the problems of high insulation cost and large size in high voltage scenarios.

[0010] (2) Modular power supply redundancy design: The DC / DC converter and the laser power harvester form a dual power supply system. During normal operation, laser wireless power supply is given priority. When the laser link fails, it automatically switches to the DC / DC converter channel powered by the battery cluster to ensure the continuous power supply reliability of the H-bridge module and controller.

[0011] (3) Dynamic energy closed loop: The DC / DC converter feeds the high-voltage side of the battery pack back to the low-voltage control loop, forming an energy self-sustaining cycle, reducing the dependence on external laser energy input, and improving the overall energy efficiency of the system.

[0012] (4) Topology compatibility: The distributed laser power supply node design is adopted, and each valve tower is equipped with an independent energy harvesting unit, which can adapt to the expansion needs of different cascaded valve towers, and is especially suitable for the rapid deployment of modular energy storage systems in harsh environments such as offshore wind power.

[0013] (5) Improved anti-interference: Laser signal transmission is not affected by electromagnetic field interference. Under high voltage and high current conditions, it can avoid the common mode noise problem existing in traditional cable power supply and ensure the transmission stability of control signal.

[0014] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a high-voltage cascaded valve hall energy storage system, which is an embodiment of the valve tower control structure of a high-voltage cascaded energy storage system with laser-triggered energy harvesting according to the present invention.

[0016] Figure 2 This is a schematic diagram of the valve tower control structure according to an embodiment of the present utility model.

[0017] Figure 3 This is a flowchart illustrating the energy harvesting process of the valve tower control structure according to an embodiment of the present invention.

[0018] Figure Labels

[0019] 1. External laser emitting device; 2. Laser energy harvesting device; 3. DC / DC converter; 4. DC power switching device; 5. H-bridge module; 6. PACK module controller. Detailed Implementation

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0021] Example

[0022] The circuit structure of existing high-voltage cascaded energy storage systems is as follows: Figure 1 As shown, the high-voltage cascaded valve hall energy storage system comprises three bridge arms, each consisting of multiple cascaded valve towers. Each valve tower consists of parallel H-bridge modules 5 and several battery clusters. Each battery cluster includes several series-connected PACK modules, which are composed of parallel PACK module controllers 6 and battery stacks.

[0023] This application proposes a valve tower control structure for a high-voltage cascaded energy storage system based on laser-triggered energy harvesting. The valve tower control structure includes an external laser emitting device 1, a laser energy harvesting device 2, a DC power switching device 4, and a DC / DC converter 3. Figure 2 As shown.

[0024] The laser emitted by the external laser emitting device 1 propagates through a medium and then irradiates the laser energy harvesting device 2. Upon receiving the laser, the laser energy harvesting device 2 performs internal energy conversion. The laser energy harvesting device 2 is connected to the input side of the DC power switching device 4 and outputs DC control power to the DC power switching device 4. The medium is air or optical fiber.

[0025] The output side of the DC power switching device 4 is connected to the H-bridge module 5 and several PACK module controllers 6 respectively. The high voltage input side of the DC / DC converter 3 is connected in parallel with the H-bridge module 5 and the battery pack. The low voltage output side of the DC / DC converter 3 is connected to the input side of the power switching device.

[0026] The laser energy harvesting device 2, the DC power switching device 4, and the DC / DC converter 3 are installed inside the valve tower.

[0027] Its energy harvesting process is as follows Figure 3 As shown, the steps are as follows:

[0028] S1. The energy storage system receives the operation command and controls the external laser emitting device 1 to emit a laser.

[0029] S2. The laser is transmitted through a medium. After the laser energy harvesting device 2 located in the valve tower receives the laser, it performs internal energy conversion and outputs DC control power to the input side of the DC power switching device 4.

[0030] S3. After the input side of the DC power switching device 4 is powered on, it outputs two power supplies: one to provide working power for the H-bridge module 5, and the other to provide working power for the PACK module controller 6.

[0031] After S4, H-bridge module 5 and PACK module controller 6 are powered on, they start working, start the energy storage system, and establish voltage on the DC side of the valve tower.

[0032] S5, the high voltage input side of the DC / DC converter 3 receives high voltage from the H-bridge module 5 and the PACK module controller 6. The DC / DC converter 3 operates and outputs low voltage power to the DC power switching device 4.

[0033] S6. The DC power switching device 4 can continue to use the power supply of the laser energy harvesting device 2, or use the low-voltage power supply provided by the DC / DC converter 3 to maintain system operation.

[0034] Taking a 220kV high-voltage cascaded energy storage power station as an example, the energy storage system consists of 3 sets of bridge arms, totaling 72 valve towers. Each valve tower contains 3 sets of H-bridge modules and 12 battery clusters. Each battery cluster consists of 6 battery packs connected in series and then 4 sets connected in parallel. Each valve tower has the following built-in components:

[0035] Laser energy harvesting device 2: integrates gallium arsenide photovoltaic cell array, with Fresnel lenses on the surface to focus externally incident 808nm band laser.

[0036] PACK module controller 6: Includes IGBT drive circuit, voltage sampling unit and equalization management chip.

[0037] Battery pack: It uses lithium iron phosphate cells in a 1 parallel and 104 series configuration to form a 332.8V 314Ah module.

[0038] Workflow:

[0039] 1. When the system starts up, the ground laser emission array (including redundant laser groups) which serves as the external laser emission device 1 transmits 50W laser light to the optical splitter at the top of the valve tower through the fiber bundle, and then distributes it to the laser energy harvesting device 2 of each valve tower through the fiber splitter.

[0040] 2. The laser energy is converted into 24V DC after photovoltaic conversion. It is then used to power the PACK module controller 6 and the H-bridge gate drive circuit through the priority selection circuit of the DC power switching device 4.

[0041] 3. When an abnormality in laser power supply is detected (such as a 30% power drop lasting 100ms due to fiber breakage), the switching device automatically connects the DC / DC conversion channel. At this time, the energy from the battery stack is boosted by the H-bridge inverter and then stepped down to 24V by the LLC resonant circuit in the DC / DC conversion device 3 to maintain power supply to the control system.

[0042] 4. Under grid-connected discharge conditions, the H-bridge module 5 achieves multi-level output through carrier phase shift control, while the controllers of each PACK module 6 monitor the cell voltage in real time and control the energy difference within ±2% through the active balancing circuit.

[0043] Therefore, compared with the current isolation transformer energy harvesting scheme of high-voltage cascaded energy storage systems, this application proposes a laser-triggered energy harvesting scheme, the main advantages of which are as follows:

[0044] 1. Low cost: Compared with isolation transformer solutions, the manufacturing process is simple, laser energy harvesting technology is mature and has a large number of engineering applications, which can greatly reduce the cost of the entire high-voltage cascaded energy storage system.

[0045] 2. High voltage level applicability: Since it adopts laser triggering and DC side power extraction, there is no need to consider the insulation design of the power extraction device. This solution can be used for 110 / 220kV power grids, and even higher voltage level power grids can be adapted.

[0046] 3. Space saving: Since it uses laser energy harvesting and DC / DC device self-energy harvesting, there is no need to consider insulation design. Compared with the existing isolation transformer energy harvesting solution, the energy storage system has a smaller overall size, saves space, and improves the system energy density.

[0047] 4. Dual redundant power supply: It adopts two power supplies, one for laser power harvesting and the other for DC / DC device self-powering, resulting in higher system reliability.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A valve tower control structure of a laser-triggered energy-stored high-voltage cascade energy storage system, the valve tower being composed of H-bridge modules and a plurality of battery clusters in parallel, the battery cluster comprising a plurality of PACK modules in series, the PACK module being composed of a PACK module controller and a battery stack in parallel, characterized in that: The valve tower control structure comprises an external laser emitting device, a laser energy taking device, a direct current power switching device, a DC / DC conversion device, the external laser emitting device emits laser to the laser energy taking device, the laser energy taking device is connected with the input side of the direct current power switching device, the output side of the direct current power switching device is connected with the H bridge module and a plurality of PACK module controllers respectively, the high voltage input side of the DC / DC conversion device is connected with the H bridge module and the battery cluster in parallel, and the low voltage output side of the DC / DC conversion device is connected with the input side of the power switching device.

2. A valve tower control structure of a laser-triggered high-voltage cascade energy storage system according to claim 1, characterized in that: The laser energy taking device, the direct current power switching device and the DC / DC conversion device are installed in the valve tower.

3. A valve tower control structure of a laser-triggered high-voltage cascade energy storage system according to claim 1, characterized in that: The laser emitted by the external laser emitting device is irradiated to the laser energy taking device after propagating through a medium, the laser energy taking device converts energy internally after receiving the laser, and outputs a direct current control power to the direct current power switching device.

4. A valve tower control structure of a high voltage cascade energy storage system with laser triggered energy extraction according to claim 3, characterized in that: The medium is air or an optical fiber.

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