阅读说明：本技术 通信基站电力智能控制系统及控制方法 (Intelligent control system and control method for electric power of communication base station ) 是由 贾永智 孙耀荣 于 2020-04-16 设计创作，主要内容包括：本发明提供了一种通信基站电力智能控制系统及控制方法。该通信基站电力智能控制系统包括隔离储能变流器、DC/DC控制器、锂电池组以及电池管理单元,隔离储能变流器与市电电网、通信基站电源设备、多个DC/DC控制器均连接；多个锂电池组与多个DC/DC控制器一一对应地连接；多个锂电池组通过电池管理单元与隔离储能变流器连接；市电电网处于正常状态时,隔离储能变流器直接向通信基站电源设备供电并向锂电池组充电；市电电网处于非正常状态时,锂电池组以相同功率放电向通信基站电源设备供电；解决了现有通信基站在市电中断后采用UPS进行供电无法调节及保证单体电池的一致性,从而缩短了整个电池组有效工作时间的问题。(The invention provides an intelligent power control system and method for a communication base station. The intelligent power control system of the communication base station comprises an isolation energy storage converter, a DC/DC controller, a lithium battery pack and a battery management unit, wherein the isolation energy storage converter is connected with a mains supply power grid, communication base station power equipment and a plurality of DC/DC controllers; the plurality of lithium battery packs are connected with the plurality of DC/DC controllers in a one-to-one correspondence manner; the plurality of lithium battery packs are connected with the isolation energy storage converter through the battery management unit; when the commercial power grid is in a normal state, the isolation energy storage converter directly supplies power to the communication base station power supply equipment and charges the lithium battery pack; when the mains supply power grid is in an abnormal state, the lithium battery pack discharges electricity with the same power to supply power to the communication base station power supply equipment; the problem of current communication base station adopt UPS to supply power after the commercial power is interrupted and can't adjust and guarantee the uniformity of battery cell is solved to whole group battery effective operating time has been shortened.)

1. The utility model provides a communication base station electric power intelligence control system which characterized in that includes:

the system comprises an isolation energy storage converter (10), wherein the isolation energy storage converter (10) is connected with a mains supply power grid (20) and communication base station power equipment (30);

a plurality of DC/DC controllers (40), wherein the plurality of DC/DC controllers (40) are connected with the isolated energy storage converter (10);

a plurality of lithium battery packs (50), wherein the plurality of lithium battery packs (50) are connected with the plurality of DC/DC controllers (40) in a one-to-one correspondence manner;

a battery management unit (60), a plurality of lithium battery packs (50) are connected with the isolation energy storage converter (10) through the battery management unit (60);

when the commercial power grid (20) is in a normal state, the isolation energy storage converter (10) directly supplies power to the communication base station power equipment (30) and converts alternating-current voltage of the commercial power grid (20) into direct-current voltage to charge the lithium battery packs (50) through the plurality of DC/DC controllers (40); when the commercial power grid (20) is in an abnormal state, the plurality of lithium battery packs (50) are discharged through the plurality of DC/DC controllers (40) to transmit direct-current voltage to the isolation energy storage converter (10) to be converted into alternating-current voltage to supply power to the communication base station power supply equipment (30);

the battery management unit (60) is used for monitoring the running state information of the plurality of lithium battery packs (50), and the isolation energy storage converter (10) and the plurality of DC/DC controllers (40) are used for controlling the discharge power of the plurality of lithium battery packs (50) to be consistent in the discharge process according to the state information of the plurality of lithium battery packs (50).

2. The communication base station power intelligent control system according to claim 1, wherein the isolation energy storage converter (10) has an energy management unit (11), and a plurality of the DC/DC controllers (40) and the battery management unit (60) are connected to the isolation energy storage converter (10) through the energy management unit (11);

the energy management unit (11) is used for controlling the working states of the isolation energy storage converter (10) and the plurality of DC/DC controllers (40) according to the running state information of the lithium battery pack (50) sent by the battery management unit (60) so as to enable the discharging power of the plurality of lithium battery packs (50) to be consistent in the discharging process.

3. The intelligent control system for the communication base station power is characterized in that the isolation energy storage converter (10) comprises a main power circuit, a signal detection circuit, a control circuit and a driving circuit; the main power circuit is connected with the mains power grid (20), the communication base station power supply equipment (30), the plurality of DC/DC controllers (40), the signal detection circuit, the control circuit and the drive circuit; the signal detection circuit, the control circuit and the driving circuit are all connected with the energy management unit (11);

when the utility power grid (20) is in a normal state, the main power circuit is used for receiving the alternating-current voltage of the utility power grid (20) and directly supplying power to the communication base station power supply equipment (30) or converting the alternating-current voltage of the utility power grid (20) into direct-current voltage to be transmitted to the plurality of DC/DC controllers (40); when the commercial power grid (20) is in an abnormal state, the main power circuit is also used for converting direct current transmitted by the plurality of DC/DC controllers (40) into alternating current voltage and supplying the alternating current voltage to the communication base station power supply equipment (30);

the signal detection circuit is used for detecting voltage and current signals of the main power circuit and sending the signals to the energy management unit (11); the control circuit is used for controlling the main power circuit and communicating with the energy management unit (11); the driving circuit is used for driving the main power circuit.

4. The intelligent control system for electric power of communication base station according to claim 2, further comprising:

the upper computer monitoring platform (70) is connected with the isolation energy storage converter (10) through the energy management unit (11), and the upper computer monitoring platform (70) is used for monitoring the working states of the isolation energy storage converter (10), the DC/DC controller (40) and the lithium battery pack (50) through the energy management unit (11).

5. The intelligent control system for power of communication base station according to claim 1, wherein the DC/DC controller (40) adopts an isolated full-bridge bidirectional DC/DC conversion circuit, and the isolated full-bridge bidirectional DC/DC conversion circuit is composed of two full circuit bridges, a high-frequency inductor and a high-frequency transformer.

6. The intelligent control system for electric power of communication base station according to claim 1, wherein the plurality of lithium battery packs (50) comprises 48V lithium battery packs and 60V lithium battery packs.

7. An intelligent power control method for a communication base station is characterized by comprising the following steps:

when the commercial power grid is in a normal state, the commercial power grid supplies power to the communication base station power supply equipment and charges a plurality of lithium battery packs;

and when the commercial power grid is in an abnormal state, controlling the plurality of lithium battery packs to discharge with the same power so as to supply power to the communication base station power supply equipment.

Technical Field

The invention relates to the field of power control systems, in particular to an intelligent power control system and method for a communication base station.

Background

The communication power supply is generally called the heart of the communication base station, and the communication power supply occupies a very important position in the construction of the communication base station. Generally, a power supply system is required to have reliability, stability, miniaturization, and high efficiency in a communication base station.

The situation that the communication base station is interrupted due to the interruption of the commercial power and the failure of the power matching equipment occurs occasionally, and how to guarantee the power supply of the communication base station is a problem which needs to be solved urgently by each communication company.

Generally, when the commercial Power is interrupted, a UPS (Uninterruptible Power System) is used to supply Power to the communication base station. However, the conventional UPS basically does not adopt a battery performance balancing function to protect the battery pack, so that the consistency of the single batteries cannot be adjusted and ensured, and the effective working time of the whole battery pack is shortened. Especially, when the UPS is used for a period of time, the performance of a part of the unit batteries may be deteriorated, thereby causing the whole battery pack to be discarded.

Disclosure of Invention

The invention mainly aims to provide an intelligent power control system and a control method for a communication base station, which at least solve the problems that in the prior art, the communication base station adopts a UPS to supply power after the mains supply is interrupted, and a battery pack is not protected by a battery performance balancing function, so that the adjustment cannot be performed, the consistency of single batteries cannot be ensured, and the effective working time of the whole battery pack is shortened.

In order to achieve the above object, according to a first aspect of the present invention, there is provided a communication base station power intelligent control system comprising: the isolation energy storage converter is connected with both a mains power grid and communication base station power equipment; the number of the DC/DC controllers is multiple, and the multiple DC/DC controllers are connected with the isolation energy storage converter; the lithium battery packs are connected with the plurality of DC/DC controllers in a one-to-one correspondence manner; the battery management unit is used for connecting the plurality of lithium battery packs with the isolation energy storage converter through the battery management unit; when the mains supply power grid is in a normal state, the isolation energy storage converter directly supplies power to the communication base station power supply equipment, converts alternating-current voltage of the mains supply power grid into direct-current voltage, and charges the multiple lithium battery packs through the multiple DC/DC controllers; when the commercial power grid is in an abnormal state, the plurality of lithium battery packs discharge through the plurality of DC/DC controllers to transmit direct-current voltage to the isolation energy storage converter to be converted into alternating-current voltage to supply power to the communication base station power supply equipment; the battery management unit is used for monitoring the running state information of the lithium battery packs, and the isolation energy storage converter and the DC/DC controllers are used for controlling the discharge power of the lithium battery packs to be consistent in the discharge process according to the state information of the lithium battery packs.

Furthermore, the isolation energy storage converter is provided with an energy management unit, and the plurality of DC/DC controllers and the battery management unit are connected with the isolation energy storage converter through the energy management unit; the energy management unit is used for controlling the working states of the isolation energy storage converter and the plurality of DC/DC controllers according to the running state information of the lithium battery pack sent by the battery management unit so as to enable the discharging power of the plurality of lithium battery packs to be consistent in the discharging process.

Furthermore, the isolation energy storage converter comprises a main power circuit, a signal detection circuit, a control circuit and a driving circuit; the main power circuit is connected with a mains power grid, communication base station power equipment, a plurality of DC/DC controllers, a signal detection circuit, a control circuit and a driving circuit; the signal detection circuit, the control circuit and the driving circuit are all connected with the energy management unit; when the commercial power grid is in a normal state, the main power circuit is used for receiving alternating-current voltage of the commercial power grid and directly supplying power to communication base station power equipment or converting the alternating-current voltage of the commercial power grid into direct-current voltage and transmitting the direct-current voltage to the plurality of DC/DC controllers; when the commercial power grid is in an abnormal state, the main power circuit is also used for converting direct current transmitted by the plurality of DC/DC controllers into alternating current voltage to supply power to the communication base station power supply equipment; the signal detection circuit is used for detecting voltage and current signals of the main power circuit and sending the voltage and current signals to the energy management unit; the control circuit is used for controlling the main power circuit and communicating with the energy management unit; the driving circuit is used for driving the main power circuit.

Further, still include: the upper computer monitoring platform is connected with the isolation energy storage converter through the energy management unit and is used for monitoring the working states of the isolation energy storage converter, the DC/DC controller and the plurality of lithium battery packs through the energy management unit.

Furthermore, the DC/DC controller adopts an isolated full-bridge bidirectional DC/DC conversion circuit, and the isolated full-bridge bidirectional DC/DC conversion circuit consists of two full circuit bridges, a high-frequency inductor and a high-frequency transformer.

Further, the plurality of lithium batteries includes a 48V lithium battery and a 60V lithium battery.

According to a second aspect of the present invention, there is provided a method for intelligently controlling power of a communication base station, including: when the commercial power grid is in a normal state, the commercial power grid supplies power to the communication base station power supply equipment and charges a plurality of lithium battery packs; and when the commercial power grid is in an abnormal state, controlling the plurality of lithium battery packs to discharge with the same power so as to supply power to the communication base station power supply equipment.

The intelligent power control system of the communication base station applying the technical scheme of the invention comprises an isolation energy storage converter, a DC/DC controller, a lithium battery pack and a battery management unit, wherein the isolation energy storage converter is connected with a commercial power grid and power supply equipment of the communication base station; the number of the DC/DC controllers is multiple, and the multiple DC/DC controllers are connected with the isolation energy storage converter; the number of the lithium battery packs is multiple, and the multiple lithium battery packs are connected with the multiple DC/DC controllers in a one-to-one correspondence manner; the plurality of lithium battery packs are connected with the isolation energy storage converter through the battery management unit; when the mains supply power grid is in a normal state, the isolation energy storage converter directly supplies power to the communication base station power supply equipment and converts alternating-current voltage of the mains supply power grid into direct-current voltage to charge the lithium battery packs through the plurality of DC/DC controllers; when the commercial power grid is in an abnormal state, the plurality of lithium battery packs discharge through the plurality of DC/DC controllers to transmit direct-current voltage to the isolation energy storage converter to be converted into alternating-current voltage to supply power to the communication base station power supply equipment; the battery management unit is used for monitoring the running state information of the lithium battery packs, and the isolation energy storage converter and the DC/DC controllers are used for controlling the discharge power of the lithium battery packs to be consistent in the discharge process according to the state information of the lithium battery packs. The problem of among the prior art communication base station adopt UPS to supply power after the commercial power is interrupted and do not adopt battery performance balance function protection group battery to lead to unable regulation and guarantee monomer battery's uniformity to the effective operating time of whole group battery has been shortened is solved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a block diagram illustrating an alternative power intelligent control system of a communication base station according to an embodiment of the present invention;

fig. 2 is a schematic diagram illustrating a first operation mode of an isolated energy storage converter of a communication base station power intelligent control system according to an embodiment of the present invention;

fig. 3 is a schematic diagram illustrating a second operation mode of an isolated energy storage converter of a communication base station power intelligent control system according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a main power circuit of an isolated energy storage converter of an optional communication base station power intelligent control system according to an embodiment of the present invention;

fig. 5 is a schematic diagram of an optional operation flow of an isolated energy storage converter of a communication base station power intelligent control system according to an embodiment of the present invention; and

fig. 6 is a schematic circuit structure diagram of an optional DC/DC controller of a communication base station power intelligent control system according to an embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. an isolated energy storage converter; 11. an energy management unit; 20. a mains grid; 30. a communication base station power supply device; 40. a DC/DC controller; 50. a lithium battery pack; 60. a battery management unit; 70. and an upper computer monitoring platform.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

According to a first embodiment of the present invention, there is provided a communication base station power intelligent control system, as shown in fig. 1, including an isolation energy storage converter 10, a DC/DC controller 40, a lithium battery pack 50, and a battery management unit 60, where the isolation energy storage converter 10 is connected to both a utility power grid 20 and a communication base station power supply device 30; the number of the DC/DC controllers 40 is multiple, and the multiple DC/DC controllers 40 are connected with the isolated energy storage converter 10; the number of the lithium battery packs 50 is plural, and the plural lithium battery packs 50 are connected to the plural DC/DC controllers 40 in a one-to-one correspondence; the plurality of lithium battery packs 50 are connected with the isolated energy storage converter 10 through a battery management unit 60; when the utility power grid 20 is in a normal state, the isolated energy storage converter 10 directly supplies power to the communication base station power supply device 30, converts the alternating-current voltage of the utility power grid 20 into direct-current voltage, and charges the plurality of lithium battery packs 50 through the plurality of DC/DC controllers 40; when the utility power grid 20 is in an abnormal state, the plurality of lithium battery packs 50 are discharged through the plurality of DC/DC controllers 40 to transmit direct-current voltage to the isolated energy storage converter 10 to be converted into alternating-current voltage to supply power to the communication base station power supply equipment 30; the battery management unit 60 is configured to monitor the operating status information of the plurality of lithium battery packs 50, and the isolated energy storage converter 10 and the plurality of DC/DC controllers 40 are configured to control the discharging power of the plurality of lithium battery packs 50 to be consistent during the discharging process according to the status information of the plurality of lithium battery packs 50. The problem of among the prior art communication base station adopt UPS to supply power after the commercial power is interrupted and do not adopt battery performance balance function protection group battery to lead to unable regulation and guarantee monomer battery's uniformity to the effective operating time of whole group battery has been shortened is solved.

In one embodiment, the plurality of lithium batteries 50 includes 48V lithium batteries and 60V lithium batteries, and may be 48V/60V-20AH lithium iron phosphate batteries or manganese lithium batteries. The lithium battery packs 50 are placed in a cabinet bin, the cabinet bin is divided into a main body bin and an expansion bin, the main body bin is 12, the expansion bin is 8, and each bin is provided with one bidirectional DC/DC controller 40. The lithium battery pack 50 has one function of battery replacement and the other function of battery backup. When the commercial power is normal, a plurality of lithium cell groups 50 are in the mode of charging, and after the charging of a plurality of lithium cell groups 50 is completed, the whole equipment is used as a battery replacing cabinet, so that the service of replacing batteries for urban electric vehicles with compensation is provided. When the utility power fails, the multiple lithium battery packs 50 are in a discharge mode, and the whole equipment is used as a power supply cabinet to provide uninterrupted power supply for the communication base station power supply equipment 30.

The communication base station power intelligent control system of this embodiment is further provided with an equipment bin, and the equipment bin is used for installing the isolation energy storage converter 10. When the utility power grid 20 is normal, the plurality of lithium battery packs 50 are charged with constant current through the isolation energy storage converter 10 and the DC/DC controller 40, and power is supplied to the communication base station power supply equipment 30; when the utility power grid 20 has a fault, a control strategy of 'one-dispatching and two-responding' is adopted, electric energy dispatching and adjustment are performed through the isolation energy storage converter 10 and the DC/DC controller 40, so that the plurality of lithium battery packs 50 are ensured to discharge in response to dispatching instructions, in the discharging process, the discharging power of each lithium battery pack 50 is consistent, and then the isolation energy storage converter 10 converts direct current into alternating current to provide uninterrupted power supply for the communication base station power supply equipment 30. The problem of among the prior art communication base station adopt UPS to supply power after the commercial power is interrupted and do not adopt battery performance balance function protection group battery to lead to unable regulation and guarantee monomer battery's uniformity to the effective operating time of whole group battery has been shortened is solved. Meanwhile, the intelligent power control system of the communication base station can be provided with base station loads with Active Power Factor Correction (APFC) switch power supplies and large or complex sensitive loads, is high in voltage stabilization precision and can adjust output frequency.

Further, the system further comprises an upper computer monitoring platform 70, wherein the upper computer monitoring platform 70 is connected with the isolated energy storage converter 10 through an energy management unit 11, and the upper computer monitoring platform 70 is used for monitoring the working states of the isolated energy storage converter 10, the DC/DC controller 40 and the plurality of lithium battery packs 50 through the energy management unit 11; the DC/DC controller 40 employs an isolated full-bridge bidirectional DC/DC conversion circuit, which is composed of two full circuit bridges, a high-frequency inductor and a high-frequency transformer.

The isolation energy storage converter 10 is provided with an energy management unit 11, and the plurality of DC/DC controllers 40 and the battery management unit 60 are connected with the isolation energy storage converter 10 through the energy management unit 11; the energy management unit 11 is configured to control the operating states of the isolated energy storage converter 10 and the plurality of DC/DC controllers 40 according to the operating state information of the lithium battery packs 50 sent by the battery management unit 60, so that the discharging powers of the plurality of lithium battery packs 50 during discharging are consistent.

Further, the main functions of the isolated energy storage converter 10 are: firstly, high-frequency isolation is carried out on an alternating current side and a high-voltage direct current side; the energy between the direct current voltage and the alternating current power grid flows in two directions, and the bidirectional charging and discharging function is realized; as shown in fig. 2 and 3, the system can operate in an active inversion mode to realize the conversion from dc to ac and transmit electric energy to the utility grid 20, and also operate in an active rectification mode to realize the conversion from ac to dc, and absorb electric energy from the utility grid 20 and store the electric energy in the lithium battery pack 50; active/reactive power (P/Q) control is achieved through a control strategy, power grid voltage directional vector control is adopted, orthogonal decoupling of the active power and the reactive power is achieved, and decoupling control of the power is achieved. According to the instantaneous power theory, the instantaneous control of active power and reactive power is realized. The output and the absorption of active power/reactive power can be automatically adjusted according to signals such as a monitoring system operation control instruction and the like, and the quick and accurate response is realized; grid-connected voltage abnormal tolerance capability and wide frequency range operation capability, the isolation energy storage converter 10 has strong voltage abnormal tolerance capability, and the allowable deviation of the three-phase voltage of the alternating current output end is +10% to-15% of the rated voltage. When the voltage of the power grid drops due to the failure of the utility power grid 20, the isolation energy storage converter 10 schedules the required power for the output system, the output current is greatly increased, the abnormal power grid voltage tolerance of the isolation energy storage converter 10 is enhanced, and the shutdown caused by triggering the overcurrent protection value of the isolation energy storage converter 10 is avoided, so that when the output current reaches the maximum value of the isolation energy storage converter 10, the power control mode is exited, the current control mode is entered, the output current is controlled to be at the maximum value of the isolation energy storage converter 10, so that the overcurrent protection value cannot be triggered, and if the isolation energy storage converter 10 still works in the maximum current control mode after three seconds, the connection with the utility power grid 20 is separated, and the protection mode is entered. If the output current does not reach the maximum value of the converter according to the power scheduling instruction sent by the upper computer, the converter works in a power control mode and operates according to the scheduling instruction of the upper computer monitoring platform 70; the wide frequency range operation capability adopts a digital phase locking technology based on vector transformation, and when the voltage frequency of the commercial power grid 20 has large fluctuation, the isolation energy storage converter 10 can quickly and accurately track the frequency and the phase of the grid voltage, so that the isolation energy storage converter 10 can normally operate in a wide frequency range; and a communication interface and a monitoring function, wherein the isolated energy storage converter 10 has a communication interface with the battery management unit 60 and the upper computer monitoring platform 70. The isolation energy storage converter 10 can communicate with the battery management unit 60 to acquire the voltage, current, SOC, fault warning information and the like of the lithium battery pack 50; meanwhile, the isolated energy storage converter 10 can transmit the operation information of the isolated energy storage converter to the upper computer monitoring platform 70 through the energy management unit 11, and the operation control requirement of the power grid is met.

The isolated energy storage converter 10 further comprises a main power circuit, a signal detection circuit, a control circuit and a driving circuit; the main power circuit is connected with the commercial power grid 20, the communication base station power supply equipment 30, the plurality of DC/DC controllers 40, the signal detection circuit, the control circuit and the drive circuit; the signal detection circuit, the control circuit and the driving circuit are all connected with the energy management unit 11; when the utility power grid 20 is in a normal state, the main power circuit is configured to receive an ac voltage of the utility power grid 20 and directly supply power to the communication base station power supply device 30, or convert the ac voltage of the utility power grid 20 into a DC voltage and transmit the DC voltage to the plurality of DC/DC controllers 40; when the utility power grid 20 is in an abnormal state, the main power circuit is further configured to convert the direct current transmitted by the plurality of DC/DC controllers 40 into an alternating current voltage to supply power to the communication base station power supply device 30; the signal detection circuit is used for detecting voltage and current signals of the main power circuit and sending the signals to the energy management unit 11; the control circuit is used for controlling the main power circuit and communicating with the energy management unit 11; the driving circuit is used for driving the main power circuit.

The main power circuit is the main part of the isolated energy storage converter 10 and is the path for energy flow. Conversion in the form of energy (DC/AC conversion or AC/DC conversion) and bidirectional flow of energy are realized through the on and off of the IGBT; the main power circuit is mainly an isolated full-bridge converter.

As shown in fig. 4, when the lithium battery pack 50 is charged, the full bridge H1 is a rectifier bridge, and converts the ac current on the side of the utility grid 20 into dc current, which is provided to the dc bus. The full bridge H2 is an inverter bridge, converts high-voltage direct current on a direct-current bus into alternating current and inputs the alternating current to a transformer T, wherein the high-frequency transformer mainly plays two roles, one is an isolation role, and the side of the commercial power grid 20 and the side of the lithium battery pack 50 are isolated from each other; secondly, the voltage transformation function is used for converting high voltage and low voltage mutually. The full bridge H3 is a rectifier bridge that converts the high frequency ac output from the transformer to low voltage dc to charge the lithium battery pack 50. In the process, the full bridge H1 controls the voltage of a direct current bus, H2 controls the high-frequency alternating current voltage, H3 controls the charging voltage or current of the lithium battery pack 50, and the three full bridges are all single closed-loop control systems; when the lithium battery pack 50 supplies power, the working modes of the three full bridges are opposite to the working modes during charging, and the full bridge H3 is an inverter bridge and converts the direct current of the lithium battery pack 50 into high-frequency alternating current. H2 is a rectifier bridge that converts high frequency ac power to dc power at high voltage and provides it to a dc bus. H1 is an inverter bridge, which converts the high voltage on the dc bus into ac power at power frequency for use by the communication base station power supply device 30 or for grid-connected feeding to the utility power grid 20. In the process, the full bridge H3 controls high-frequency voltage, H2 controls direct current bus voltage, and H1 controls power frequency alternating current voltage. The three full bridges are also single closed loop control links.

The signal detection circuit mainly realizes the high-precision detection of voltage and current signals of the main power circuit, a signal processing function and a fault signal detection function; the control circuit is the core part of the isolated energy storage converter 10. The TI high-speed industrial grade DSP chip is used as a core processor, and the functions realized by the control circuit mainly comprise: sampling and calculating signals such as voltage signals and current signals, controlling a converter, judging and protecting the fault of the converter, and communicating with an energy management unit 11; the drive circuit selects the special drive of the IGBT to ensure that the IGBT works in the optimal switching state, thereby improving the working reliability of the IGBT; meanwhile, the driving circuit detects abnormal states such as overcurrent and overtemperature of the IGBT power device, and when the abnormal states occur, the power device is turned off to achieve the function of protecting the device; the energy management unit 11 is integrated in the isolated energy storage converter 10, a 3-inch high-definition LCD touch screen is used as an input/output interface, a friendly man-machine interaction interface is provided, various communication interfaces are provided, and the local control function of the isolated energy storage converter 10 is realized. The LCD liquid crystal touch screen has the following characteristics: friendly human-computer interaction interface, high reliability, 2G data storage space and various communication interfaces (Ethernet, RS485 and CAN).

In the operation process of the isolation energy storage converter 10, as shown in fig. 5, firstly, registers, global variables and constants in a control circuit need to be set, an I/O port needs to be defined and initialized, a system sampling frequency, a switching tube working frequency, dead time and the like are determined through timer parameter setting, and a sine and cosine value table is generated so as to generate a standard sine voltage current; after the initialization is finished, sampling the input and output voltage and current of the isolated energy storage converter 10, and calculating the effective value and the phase of the voltage or the current so as to compare the effective value and the phase with a reference value; the upper computer monitoring platform 70 communicates with the control circuit, and the selection of the working mode is completed by operating the human-computer interface; comparing the measured value with the reference value, then calculating the deviation value, sending the deviation value into a PID processing subprogram, obtaining a modulation variable after PID adjustment, comparing the variable with the set upper limit and the lower limit, if the variable does not exceed the limit value, comparing the variable with a triangular wave to generate an SPWM wave to control a switching tube, and if the variable exceeds the limit value, comparing the limit value with the triangular wave to generate the SPWM wave, wherein the method can ensure that the operation of the isolated energy storage converter 10 is more reliable and stable; and finally, detecting the input and output variables again to operate circularly.

The DC/DC controller 40 mainly functions: bi-directional energy transfer between the lithium battery pack 50 and the dc bus of the isolated energy storage converter 10; secondly, intelligent detection and charging and discharging management of the lithium battery pack 50 are realized through a control strategy, and the load power of a bus is tracked; and intelligently responding to and adjusting the power supply/discharge mode of the lithium battery packs 50 to ensure that the discharge power of each lithium battery pack 50 is consistent during discharge.

The DC/DC controller 40 adopts an isolated full-bridge bidirectional DC/DC conversion circuit, which is composed of two full bridges, a high-frequency inductor Lt and a high-frequency transformer T, as shown in fig. 6. In the forward DC/DC conversion process, the full bridge on the left side of the transformer inverts the DC bus voltage into high-frequency AC, and the AC is rectified into DC by the full bridge on the right side of the transformer after being subjected to voltage reduction and isolation by the transformer. In the process of reverse DC/DC conversion, the working states of the two full bridges are interchanged. Optionally, the control chip of the DC/DC controller 40 is a DSP series controller of TI corporation, specifically, a TMS320F2812 chip is selected.

The energy management unit 11 integrated with the isolation energy storage converter 10 adopts a 3-inch high-definition LCD touch screen as an energy management controller, so that the isolation energy storage converter 10 has strong monitoring, communication and man-machine interaction capabilities. The LCD can receive/send commands to control the isolated energy storage converter 10 to start, stop and reset faults; the LCD displays data such as the running state, the working mode, the direct current side voltage current value, the commercial power grid 20 side voltage current value, the generating power, the generating capacity and the like of the isolation energy storage converter 10 in real time; when a fault occurs, the LCD records the name and the state of the fault and each detection point data when the fault occurs, and stores the data, thereby providing a powerful tool for debugging, running, maintaining and fault analyzing of equipment; the parameters of the current transformer, such as output, energy storage power value, protection threshold value, action time and the like, can be set through the LCD.

The communication between the isolated energy storage converter 10 and the energy management unit 11, the upper computer monitoring platform 70 and the battery management unit 60 is realized through an LCD (liquid crystal display) screen. LCD liquid crystal touch-sensitive screen provides communication interfaces such as ethernet, RS485 and CAN, supports MODBUS communication protocol. The isolated energy storage converter 10 receives a control command of the energy management unit 11 through the LAN, and when the remote control mode is active, the local control function is inactive. Meanwhile, the LCD touch screen can upload the running state and real-time running data of the isolated energy storage converter 10 to the upper computer monitoring platform 70. The uploaded operation information comprises: battery charging current, battery pack port voltage, battery discharging current, alternating side voltage/current/frequency, power device temperature, control/protection fixed value, protection and fault signal; the uploaded converter operation information comprises the following contents: battery charging current, battery pack port voltage, battery discharging current, ac side voltage/current/frequency, power device temperature, control/protection settings, protection and fault signals. The LCD touch screen realizes data interaction between the isolated energy storage converter 10 and the battery management unit 60 through the CAN or RS485 interface, and CAN receive the battery state quantity and the alarm information sent by the battery management unit 60, such as the chargeable capacity of the battery pack, the dischargeable capacity of the battery pack, and the battery pack state: full, empty, normal, alarm, fault, etc.

The battery management unit 60 is composed of a battery module monitoring module (BMU), a battery cluster management module (BCMS), a direct current monitoring module (DMU), a battery stack management module (BAMS), a display module, a monitoring module, and the like. The main functions of the battery management unit 60 are: monitoring and transmitting the operation state information of the lithium battery pack 50, such as battery voltage, current, temperature, protection amount, and the like; evaluating and calculating the state of charge (SOC), the state of health (SOH) of the service life, the accumulated processing energy of the battery and the like of the lithium battery pack 50; the safety of the battery is protected. The battery management unit 60 can perform real-time monitoring, charging and discharging, balancing, routing inspection, temperature monitoring and the like on the single batteries and the whole battery pack, and can manage the plurality of lithium battery packs 50 by adopting intelligent technologies such as voltage balancing control, over-temperature protection and the like, and detect the voltage, the total battery pack current, the multi-channel environment temperature and the like of all the single lithium battery packs 50 in each group.

The upper computer monitoring platform 70 consists of three layers of an operating system, a supporting platform and application functions. The support platform comprises modules of data acquisition management, database management, network communication management, graphical interface, report management, authority management, alarm management, calculation statistics, system management and the like. The application function is divided into two parts, namely a basic application function and an advanced management function, wherein the basic application function comprises data acquisition, monitoring, statistical analysis, safe WEB data release and the like, and the advanced management function comprises global energy management target control and the like.

According to a second embodiment of the present invention, there is provided a method for intelligently controlling power of a communication base station, including the following steps: when the utility power grid 20 is in a normal state, the utility power grid 20 supplies power to the communication base station power supply equipment 30 and charges the plurality of lithium battery packs 50; when the utility power grid 20 is in an abnormal state, the plurality of lithium battery packs 50 are controlled to discharge at the same power to supply power to the communication base station power supply device 30. During practical application, when the commercial power is normal, a plurality of lithium cell groups 50 are in the mode of charging, and after a plurality of lithium cell groups 50 were charged and were accomplished, whole equipment regarded as and traded the battery cabinet and used, provided the battery service of changing for compensation for the city electric motor car. When the utility power fails, the multiple lithium battery packs 50 are in a discharge mode, and the whole equipment is used as a power supply cabinet to provide uninterrupted power supply for the communication base station power supply equipment 30. The problem of among the prior art communication base station adopt UPS to supply power after the commercial power is interrupted and do not adopt battery performance balance function protection group battery to lead to unable regulation and guarantee monomer battery's uniformity to the effective operating time of whole group battery has been shortened is solved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.