High-efficiency storage integrated direct-current lead-carbon energy storage system for base station

Abstract

The invention discloses a high-efficiency storage integrated direct-current lead-carbon energy storage system for a base station and a control method. The system comprises a switching power supply cabinet, an energy storage battery cabinet which is electrically connected with the switching power supply cabinet and supplies power to a base station, an electric meter installed between the switching power supply cabinet and the energy storage battery cabinet, a control system used for controlling the energy storage battery cabinet, and a temperature control system used for monitoring the energy storage battery cabinet. The switching power supply cabinet is also connected with a non-energy-storage power supply; and the non-energy storage power supply is used for charging the energy storage battery cabinet and supplying power to the base station.

Description

Technical Field

[0001] The present invention relates to a lead-carbon energy storage system, in particular to a high-efficiency integrated DC lead-carbon energy storage system for base stations and a control method therefor. Background Art

[0002] At present, base station energy storage is mainly implemented on the AC side and is connected to the energy storage for off-grid operation, and seamless switching backup power is achieved through STS. The battery energy storage system of the system undergoes multiple conversions, resulting in low efficiency. Adding an electronic transfer switch brings the risk of backup power switching. Or it cooperates with a UPS for backup power, increasing additional investment. The backup power of base stations mainly uses lead-acid batteries for floating charge backup power. It may not be used several times from the time of investment to the end of its life, and its actual utilization value is relatively low. It is all for ensuring existence, and long-term floating charge will also greatly reduce the battery life. The backup power battery without any control does not know its capacity, so the backup power duration cannot be controlled, and a large amount of manpower is required for operation and maintenance detection.

[0003] For traditional base station energy storage DC access, a DC-DC power conversion device must be added because the voltage of the main bus of the conventional base station switching power supply is fixed. Without a DC-DC conversion device, energy storage charge and discharge control cannot be carried out, and it can only be used for backup power floating charge. Moreover, the conversion efficiency will also have an additional loss of one level of DC-DC, and the reliability of seamless switching of backup power cannot be guaranteed. Summary of the Invention

[0004] To solve the above problems, the present application provides a high-efficiency integrated DC lead-carbon energy storage system for base stations and a control method therefor.

[0005] The present invention provides the following technical solution: A high-efficiency integrated DC lead-carbon energy storage system for base stations, comprising a switching power supply cabinet, an energy storage battery cabinet electrically connected to the switching power supply cabinet and supplying power to the base station, an electric meter installed between the switching power supply cabinet and the energy storage battery cabinet, a control system for controlling the energy storage battery cabinet, and a temperature control system for monitoring the energy storage battery cabinet; the switching power supply cabinet is further connected to a non-energy storage power supply; the non-energy storage power supply is used for charging the energy storage battery cabinet and supplying power to the base station.

[0006] Further, the control system includes at least one of BMS control, EMS control, or a cloud control platform.

[0007] Further, the non-energy storage power supply is commercial power.

[0008] Further, the energy storage battery cabinet is charged during valley electricity. First, set the constant current = (battery full capacity Q - current battery capacity Q1) * conversion efficiency 0.93 / (valley electricity duration - 2). When the constant current voltage reaches 56.5V, switch to constant voltage 57.5V for charging. The constant voltage duration satisfies 2 hours or when the battery current is less than 10A after constant voltage, switch to floating charge at 53.5V.

[0009] A control method for the high-efficiency reserve integrated DC lead-carbon energy storage system of the base station as described above, which discharges the energy storage battery cabinet during peak power. First, set the backup power cut-off voltage = the undervoltage value of switch power supply 1 + 0.5V error for discharging. The EMS adjusts according to 30% of the remaining SOC and SOH as the final cut-off voltage to ensure backup power is reserved. At this time, the battery voltage is higher than the busbar voltage, and the battery energy storage discharges first.

[0010] A control method for the high-efficiency reserve integrated DC lead-carbon energy storage system of the base station as described above. The backup power duration (big data has the electricity meter detecting and measuring the real-time electricity quantity Q, the current load current I, the battery voltage U, the discharge conversion efficiency η, the thermal management energy consumption Q1, and the remaining operation time prompt T = (Q * η - Q1) / (U * I)). The thermal management energy consumption Q1 = the thermal management power * the operation time.

[0011] The efficiency of the energy storage accessing the DC energy storage system = the battery charge and discharge efficiency * the line loss (the efficiency of the traditional DC access system energy storage = the battery charge and discharge efficiency * the dcdc charging conversion efficiency * the dcdc discharge conversion efficiency * the line loss). It can be seen by comparison that the efficiency of the DC access is much higher than that of the traditional DC access method. At the same time, it is equipped with a temperature control system and cloud platform monitoring, greatly improving the safety and reliability of the energy storage battery. The beneficial effects of the present invention are as follows: (1) The lead-carbon battery energy storage cabinet switch power supply battery fuse terminal is accessed with full life cycle control, improving the energy storage charge and discharge conversion efficiency.

[0012] (2) The base station switch power supply has a wide-voltage three-stage battery charge and discharge management, improving the battery life and increasing the energy storage income.

[0013] (3) With BMS, EMS, and cloud platform full-capacity monitoring, the battery is directly connected to the busbar for backup power, which is safe and reliable. Description of the Drawings

[0014] Figure 1 It is a module schematic diagram of the high-efficiency reserve integrated DC lead-carbon energy storage system of the base station of the present invention; Figure 2 It is a charging process schematic diagram of the high-efficiency reserve integrated DC lead-carbon energy storage system of the base station of the present invention. Detailed Embodiments

[0015] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following combines the drawings and preferred embodiments to describe in detail the specific embodiments, structures, features, and their effects of the present invention as follows.

[0016] The following further describes the embodiments of the present invention through multiple embodiments.

[0017] Example 1 As Figure 1 , a high-efficiency integrated DC lead-carbon energy storage system for base stations includes a switching power supply cabinet, an energy storage battery cabinet electrically connected to the switching power supply cabinet and supplying power to the base station, an ammeter installed between the switching power supply cabinet and the energy storage battery cabinet, a control system for controlling the energy storage battery cabinet, and a temperature control system for monitoring the energy storage battery cabinet; the switching power supply cabinet is also connected to a non-energy storage power supply; the non-energy storage power supply is used to charge the energy storage battery cabinet and supply power to the base station.

[0018] The control system at least includes BMS control, EMS control, and a cloud control platform.

[0019] The non-energy storage power supply is commercial power.

[0020] As Figure 2 , the energy storage battery cabinet is charged during valley electricity, First, set the constant current = (battery full capacity Q - current battery capacity Q1) * conversion efficiency 0.93 / (valley electricity duration - 2). When the constant current voltage reaches 56.5V, switch to constant voltage 57.5V for charging. The constant voltage duration meets 2 hours or when the battery current is less than 10A after constant voltage, switch to floating charge at 53.5V.

[0021] A control method for the above high-efficiency integrated DC lead-carbon energy storage system for base stations discharges the energy storage battery cabinet during peak electricity, First, set the backup power cut-off voltage = switching power supply 1 disconnection voltage value + 0.5V error for discharging, The EMS adjusts according to 30% of the remaining SOC and SOH as the final cut-off voltage to ensure backup power is left). At this time, the battery voltage is higher than the busbar voltage, and the battery energy storage discharges first.

[0022] A control method for the above high-efficiency integrated DC lead-carbon energy storage system for base stations, backup power duration (big data has the ammeter detecting and measuring the real-time electricity quantity Q, the current load current I, the battery voltage U, the discharge conversion efficiency η, the thermal management energy consumption Q1, and the remaining operation time prompt T = (Q * η - Q1) / (U * I)), and the thermal management energy consumption Q1 = thermal management power * operation time.

[0023] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A high-efficiency integrated DC lead-carbon energy storage system for base stations, characterized in that: It includes a switching power supply cabinet, an energy storage battery cabinet electrically connected to the switching power supply cabinet and supplying power to the base station, an electric meter installed between the switching power supply cabinet and the energy storage battery cabinet, a control system for controlling the energy storage battery cabinet, and a temperature control system for monitoring the energy storage battery cabinet; the switching power supply cabinet is also connected to a non-energy storage power supply; the non-energy storage power supply is used to charge the energy storage battery cabinet and supply power to the base station.

2. The base station high-efficiency storage integrated DC lead-carbon energy storage system according to claim 1 is characterized in that: The control system includes at least one of BMS control, EMS control or cloud control platform.

3. The base station high-efficiency storage integrated DC lead-carbon energy storage system according to claim 1 is characterized in that: The non-energy storage power source is the mains electricity.

4. A control method for the base station high-efficiency storage integrated DC lead-carbon energy storage system according to claim 1, characterized in that: The energy storage battery cabinet is charged during off-peak hours. First set the constant current = (battery full capacity Q-current battery capacity Q1) * conversion efficiency 0.93 / (valley time-2), the constant current voltage reaches 56.5V and then switches to constant voltage 57.5V charging. When the constant voltage time reaches 2 hours or the battery current is less than 10A after constant voltage, switch to floating charge, floating charge 53.5V.

5. A control method for the base station high-efficiency storage integrated DC lead-carbon energy storage system according to claim 1, characterized in that: During peak hours, the energy storage battery cabinet is discharged. First set the backup power cut-off voltage = switching power supply 1 disconnection voltage value + 0.5V error for discharge. EMS adjusts the final cutoff voltage based on 30% of the remaining SOC and SOH to ensure that there is backup power). At this time, the battery voltage is higher than the busbar voltage, and battery energy storage discharge is given priority.

6. A control method for the base station high-efficiency storage integrated DC lead-carbon energy storage system according to claim 1, characterized in that: Backup power time (big data includes electric meter detection and measurement of real-time power Q, current load current I, battery voltage U, discharge conversion efficiency η, thermal management energy consumption Q1, and remaining running time prompt T=(Q*η-Q1) / (U*I)), thermal management energy consumption Q1=thermal management energy consumption power*running time.

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