Power control method and device, and power supply system

Abstract

The present invention provides a power control method and apparatus, as well as a power supply system. The method includes determining a communication interruption between a first power supply and a second power supply, and controlling the local output power based on a pre-stored maximum output parameter. This invention solves the technical problem of related art parallel systems failing to protect load batteries when communication is interrupted.

Description

Technical Field

[0001] The present invention relates to the field of communications, and in particular to a power control method and device, and a power supply system. Background Art

[0002] Telecommunications power supply systems in related technologies generally consist of a power input unit, a power conversion unit, a power output unit, and a monitoring and management unit. The power input source may be a diesel generator, mains electricity, solar panels, or a wind turbine, or a combination thereof. The energy input to the communications power supply passes through the power input unit and power conversion unit, converting it into -48V DC, which is then uniformly output through the power output unit.

[0003] Diesel generators are often used as an energy input source. As base station coverage expands and the number of users grows, the load on communications power supplies increases. However, to conserve initial investment, diesel generators cannot be configured with high power initially, leading to the need for later power capacity expansion. Because the power of the diesel generators—the energy input at the site—is too low, replacing them with higher-powered ones would be costly and unutilize the old generators.

[0004] A solution has been proposed for capacity expansion by connecting two or more communication power supply systems in parallel. This solution adds one or more new power supply systems to the existing power supply. Software allows multiple power supply systems to simultaneously activate diesel generators, thereby increasing output power. Because the output capacity of the existing power supply can be utilized, the power configuration requirements of the new power supply system are lower, which can save site investment. However, this parallel cabinet solution places new demands on system stability: connecting two or more power supply systems in parallel requires communication between cabinets, which requires communication cables. However, power supply systems often operate in harsh environments, and cables between cabinets are easily damaged by environmental corrosion, loosening or disconnecting, or being bitten by animals such as rats, resulting in communication problems between the multiple parallel cabinets.

[0005] The solutions in the related art do not have a method for handling abnormal situations after the communication of the cabinet is disconnected, which causes the battery of this type of power system to be overcharged after the abnormality occurs, resulting in battery damage or even station loss, causing significant losses to customers.

[0006] Currently, no effective solution has been found for the above-mentioned problems existing in the related technologies. Summary of the Invention

[0007] Embodiments of the present invention provide a power control method and device, and a power supply system.

[0008] According to one embodiment of the present invention, a power control method is provided, comprising: determining that communication between a first power source and a second power source is interrupted; and controlling local output power according to a pre-stored maximum output parameter.

[0009] According to another embodiment of the present invention, a power control device is provided, including: a determination module for determining that communication between a first power supply and a second power supply is interrupted; and a control module for controlling local output power according to a pre-stored maximum output parameter.

[0010] According to another embodiment of the present invention, a power supply system is provided, including: a first power supply and a second power supply, the first power supply including: a first management unit for determining that communication between the first power supply and the second power supply is interrupted; a first power output unit connected to the first management unit, for controlling the output power of the first power supply according to a pre-stored first maximum output parameter when communication between the first power supply and the second power supply is interrupted; the second power supply including: a second management unit for determining that communication between the second power supply and the first power supply is interrupted; a second power output unit connected to the second management unit, for controlling the output power of the second power supply according to a pre-stored second maximum output parameter when communication between the second power supply and the first power supply is interrupted.

[0011] Through the present invention, when the communication between the first power supply and the second power supply is interrupted, the local output power is controlled according to the pre-stored maximum output parameters, thereby protecting the load and battery of the power supply, avoiding the impact of current generated when the first power supply and the second power supply are interrupted, and solving the technical problem of the parallel system in the related art that cannot protect the load battery when the communication is interrupted, ensuring the normal operation of the communication load and the normal charging of the battery, avoiding battery overcharging, and improving the reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0013] Figure 1 is a flow chart of a power control method according to an embodiment of the present invention;

[0014] Figure 2 is a system block diagram of a communication power supply in an embodiment of the present invention;

[0015] Figure 3 is a structural block diagram of a power control device according to an embodiment of the present invention;

[0016] Figure 4 is a structural block diagram of a power supply system according to an embodiment of the present invention;

[0017] Figure 5 This is a system block diagram of a communication power supply according to an embodiment of the present invention;

[0018] Figure 6 This is a block diagram of a communication power supply parallel system according to an embodiment of the present invention;

[0019] Figure 7 is a master-slave logic control flow chart of an embodiment of the present invention;

[0020] Figure 8 is a maximum output current control flow chart of an embodiment of the present invention;

[0021] Figure 9 4 is a flow chart of battery current control according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0023] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0024] Example 1

[0025] In this embodiment, a power control method is provided. Figure 1 FIG. 1 is a flow chart of a power control method according to an embodiment of the present invention. Figure 1 As shown, the process includes the following steps:

[0026] Step S102, determining that communication between the first power source and the second power source is interrupted;

[0027] Step S104: Control the local output power according to the pre-stored maximum output parameter.

[0028] Through the above steps, when the communication between the first power supply and the second power supply is interrupted, the local output power is controlled according to the pre-stored maximum output parameters, thereby protecting the load and battery of the power supply, avoiding the current impact caused by the interruption of the first power supply and the second power supply, and solving the technical problem of the parallel system in the related art that cannot protect the load battery when the communication is interrupted. It ensures the normal operation of the communication load and the normal charging of the battery, avoids battery overcharging, and improves the reliability of the system.

[0029] Optionally, the execution entity of the above steps can be a power supply, such as a communications power supply, and can be specifically applied to a communications power supply management unit, etc., and can be applied to a scenario where the first power supply and the second power supply are output in parallel, but is not limited to this. In one example, the first power supply and the second power supply serve as a primary and a backup power supply, such as the first power supply is the primary power supply and the second power supply is the backup power supply. The primary power supply can manage the backup power supply.

[0030] Figure 2 This is a system block diagram of a communication power supply in an embodiment of the present invention.

[0031] The solution of this embodiment can be applied to the first power supply and the second power supply. Optionally, when the local power supply is the first power supply, before controlling the local output power according to the pre-stored maximum output parameter, it is necessary to determine the maximum output parameter. The method further includes:

[0032] S11, when the first power source and the second power source are in communication connection, collecting power parameters of a first battery of the first power source and power parameters of a first load, and obtaining power parameters of a second battery of the second power source and power parameters of a second load;

[0033] S12, calculating a first maximum output parameter of the first power source and a second maximum output parameter of the second power source based on power parameters of the first battery and the first load, and power parameters of the second battery and the second load;

[0034] S13, saving the first maximum output parameter, and sending the second maximum output parameter to the second power supply.

[0035] Optionally, the first maximum output parameter or the second maximum output parameter is obtained by the following calculation: the sum of the battery currents of the first power supply+the load current of the first power supply+the sum of the battery currents of the second power supply+the load current of the second power supply.

[0036] Optionally, when the local power source is a second power source, before controlling the local output power according to the pre-stored maximum output parameter, the method further includes: receiving a second maximum output parameter sent by the second power source.

[0037] Optionally, controlling the local output power according to the pre-stored maximum output parameter includes: while ensuring that the battery current of the local power supply is not greater than the charging limit current, using the pre-stored maximum output parameter as the total output parameter of the power conversion unit, wherein the local power supply is connected to the battery and the power conversion unit, and the local power supply is the first power supply or the second power supply.

[0038] Optionally, the maximum output parameter includes at least one of the following: maximum output current, maximum output voltage, and maximum output power.

[0039] Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus the necessary general hardware platform, and of course it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0040] Example 2

[0041] This embodiment also provides a power control device and a power supply system for implementing the above-mentioned embodiments and preferred embodiments. Details already described will not be repeated here. As used below, the term "module" may refer to a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation using hardware, or a combination of software and hardware, is also possible and contemplated.

[0042] Figure 3 is a structural block diagram of a power control device according to an embodiment of the present invention. Figure 3 As shown, the device includes:

[0043] A determination module 30, configured to determine that communication between the first power source and the second power source is interrupted;

[0044] The control module 32 is configured to control the local output power according to the pre-stored maximum output parameter.

[0045] Optionally, when the local power supply set in the device is the first power supply, the device also includes: an acquisition module, which is used to collect the power parameters of the first battery of the first power supply and the power parameters of the first load, and obtain the power parameters of the second battery of the second power supply and the power parameters of the second load when the communication connection is established between the first power supply and the second power supply, before the control module controls the local output power according to the pre-stored maximum output parameters; a calculation module, which is used to calculate the first maximum output parameter of the first power supply and the second maximum output parameter of the second power supply based on the power parameters of the first battery and the power parameters of the first load, as well as the power parameters of the second battery and the power parameters of the second load; and a processing module, which is used to save the first maximum output parameter and send the second maximum output parameter to the second power supply.

[0046] Optionally, when the local power source set in the device is the second power source, the device further includes: a receiving module, configured to receive a second maximum output parameter sent by the second power source.

[0047] Figure 4 is a structural block diagram of a power supply system according to an embodiment of the present invention. Figure 4 As shown, it includes: a first power supply 40 and a second power supply 42. The first power supply 40 includes: a first management unit 400, which is used to determine whether the communication between the first power supply and the second power supply is interrupted; a first power output unit 402, which is connected to the first management unit and is used to control the output power of the first power supply according to a pre-stored first maximum output parameter when the communication between the first power supply and the second power supply is interrupted;

[0048] The second power supply 42 includes: a second management unit 420, which is used to determine whether the communication between the second power supply and the first power supply is interrupted; a second power output unit 422, which is connected to the second management unit and is used to control the output power of the second power supply according to a pre-stored second maximum output parameter when the communication between the second power supply and the first power supply is interrupted.

[0049] When the communication between the first power supply and the second power supply is normal, the positive busbar and the negative busbar between the first power supply and the second power supply are connected through a cable, and the first management unit and the second management unit are connected through a signal line.

[0050] It should be noted that the above modules can be implemented through software or hardware. For the latter, it can be implemented in the following ways, but not limited to: the above modules are all located in the same processor; or the above modules are located in different processors in any combination.

[0051] Example 3

[0052] This embodiment is an optional embodiment of the present application, which is used to describe the solution of the present application in detail by combining usage scenarios and implementation methods.

[0053] This embodiment provides a current control method for a communication power parallel system, which can improve the stability of the power parallel system when communication is disconnected through software.

[0054] The communication power system block diagram is as follows: Figure 5 As shown, Figure 5 This is a system block diagram of the communication power supply in an embodiment of the present invention. At least one energy source selected from the group consisting of mains electricity, diesel generators, photovoltaic power, and wind power is introduced through a power input unit, converted into -48V DC power by a power conversion unit, and output to the positive and negative busbars of the power output unit. The power output unit then outputs the power to charge the battery and supply power to the load. The management unit can collect information about the total output current and battery current of the power conversion unit, and can adjust the output voltage and output current of the power conversion unit to ensure that the battery does not overcharge. The communication power supply system includes: a power input unit, a power conversion unit, a power output and distribution unit, and a management unit.

[0055] The power input unit is used to accept various types of power input, including but not limited to AC power generated by diesel generators and AC power from the power grid, DC power generated by solar panels, and power input from wind turbines. The power input unit connects to the power conversion unit, introducing different types of energy into the system for power conversion.

[0056] The power conversion unit converts the aforementioned AC power, solar panels, and wind turbine input into -48V DC power. This unit can be divided into a rectifier, a solar power control unit, and a wind energy controller. Each unit can receive commands from the management unit to control the output voltage and current to a specific value and can also send the current output voltage or current to the management unit via communication.

[0057] The power output and distribution unit consists of positive and negative busbars, circuit breakers, fuses, and their connections for short-circuit and overvoltage protection. The power output unit connects to the battery and load.

[0058] The management unit collects information from the power input unit, power output and distribution unit, and power conversion unit, and provides comprehensive management of these components. This comprehensive management is reflected in controlling the output voltage and current parameters of the power conversion unit. The monitoring unit samples real-time battery voltage and current and controls the power conversion unit to ensure that the battery is not overcharged and that power is supplied to the load normally.

[0059] The communication power supply system can introduce different types of energy into the system through the power input unit, convert them into the output voltage and current required by the current system through the power conversion unit, and output them to the communication equipment and battery through the power output and distribution unit to ensure the normal operation of the communication equipment and charge the battery.

[0060] The management unit component of the communication power supply system can collect input information from its own power input unit, output information from the power output and distribution unit, and input and output information from the power conversion unit. It calculates the output voltage and current based on this input and output information and controls the power conversion power supply to output according to the output voltage and current.

[0061] The communication power supply parallel system of this embodiment connects the positive busbars and negative busbars of the two power supply systems to each other, and connects the communication ports of the monitoring units of the two power supplies through signal lines, so that the two communication power supplies can communicate normally. The communication methods of the two power supplies include but are not limited to RS232 / RS485 / CAN / wired network / Bluetooth / WIFI. The implementation method of the communication power supply parallel system described in the present invention is: connect the two above-mentioned ordinary communication power supply system monitoring units through a certain physical connection method so that the two can communicate data, and the connection method is not limited to RS232 / RS485 / IP cable / wifi / Bluetooth / zigbee. Connect the positive and negative busbars of the power output unit to each other through power cables, as shown in the attached Figure 6 As shown, Figure 6 This is a block diagram of a communication power supply parallel system in an embodiment of the present invention.

[0062] This embodiment further provides a current control method for a communication power supply parallel system, which is applied to the above-mentioned parallel system, including:

[0063] The two parallel systems are set as master and slave respectively through the monitoring unit parameter settings;

[0064] Under normal communication conditions, the slave is responsible for collecting its own battery voltage / current and load voltage / current values, transmitting them to the host through communication, and receiving the output voltage and current information and the maximum output current value of the slave sent by the host; the slave controls the power conversion unit to output according to the output voltage and current sent by the host, does not calculate the output voltage and current values itself, and saves the received maximum output current value of the slave.

[0065] Under normal communication conditions, the host is responsible for collecting its own battery voltage / current information and load voltage / current information, and combining it with the slave battery current and load current information transmitted by the slave communication, comprehensively calculating the system's output voltage and current information and the maximum output current of the master and slave, saving its own maximum output current value, controlling the host's power conversion unit to output according to the host's output voltage and current values, and transmitting the slave's output voltage and current information and maximum output current information to the slave;

[0066] When communication between the master and slave devices is lost, the master outputs current based on its own sampled information combined with its calculated maximum output current. Simultaneously, the slave outputs current based on its own sampled information combined with the maximum output current value obtained through communication. For both the master and slave, while real-time battery current monitoring ensures that the battery does not overcharge, the total output current must also ensure that it does not exceed the maximum current value. Ideally, the master's maximum output current can supply the full system load and battery charging current. Even if the slave is not communicating with the master, it can still detect that its battery has reached its current limit. Therefore, to ensure that its battery does not overcharge, it will continuously reduce its current output and lower its voltage output. As a result, both the master and slave batteries are protected, and the same applies to the slave itself.

[0067] In one implementation of this embodiment, the current control method for the communication power supply parallel system is implemented as follows:

[0068] Use the two communication power supplies' human-machine interfaces to set them up as the master and slave, respectively. The human-machine interface can be the LCD of the communication power management unit, the communication power supply's web interface, remote backend software, mobile app, or PC local software.

[0069] The master and slave software runs different software logics according to the master and slave parameter settings to perform master-slave communication. When the master and slave communication is normal, the slave can transmit the battery current and the total output current of the power conversion unit detected by itself to the master through communication. The host calculates the output voltage and current value and the maximum output current value of the master and slave by combining the host battery current and the total output current of the power conversion unit detected by itself with the slave battery current and the total output current of the slave power conversion unit uploaded by the slave. The logic control of the master and slave is as follows: Figure 7 As shown, Figure 7 This is a master-slave logic control flow chart of an embodiment of the present invention.

[0070] The host calculates the output voltage and current limit point in the following way: the host calculates the charging current limit value of each battery group of the master and slave according to the parameter settings, and determines if any of the current detection values of the current battery groups of the master and slave is greater than N times the calculated charging current limit (the value range of N is between 1.1 and 1.4), then controls the power conversion unit to reduce the output current, and the reduction value is half of the total battery current exceeding the total current limit; if not, it determines if one of the master and slave battery currents exceeds the charging current limit. If so, the output voltage of the power output unit is reduced by one step - the actual value range of a step is [0.01,0.1]V; if not, it determines if one of the master and slave battery currents reaches or is close to its charging current limit, then the output voltage and current values are not changed. If not, then slowly increase its output voltage and current until the output voltage reaches the battery charging voltage set by the system. Continuously looping this process can ensure that the battery current does not exceed the charging current limit. Its logic control is as follows: Figure 8 As shown, Figure 8 This is a maximum output current control flow chart of an embodiment of the present invention.

[0071] The method for the host to calculate the maximum output current of the master and slave machines can be: the instantaneous value of the maximum output current of the master and slave machines = the total output current of the host power conversion unit + the total output current of the slave machine power conversion unit; and the master and slave machines save the maximum output current of the master and slave machines at that moment once at a certain period (for example, 15 minutes), continuously save the data of the last 10 days and cyclically overwrite it.

[0072] Under normal communication conditions, the slave only serves as an execution unit to receive the slave output voltage and current sent by the host communication, controls the slave power conversion unit to output, and does not participate in the calculation of the output voltage and current.

[0073] When the communication between the master and slave devices is interrupted, the master and slave devices can still detect their own battery currents and the total output current of the power conversion unit.

[0074] For the host, ensure that the total output current of the host power conversion unit is not greater than the maximum output current value of the host while ensuring that the current of its own battery is not greater than the charging current limit; for the slave, ensure that the total output current of the slave power conversion unit is not greater than the maximum output current value of the slave while ensuring that the current of its own battery is not greater than the charging current limit.

[0075] Preferably, after communication is disconnected, the maximum output current value of the host or the maximum output current value of the slave is calculated by taking the value of the previous cycle (removing the maximum and minimum values of the ten points and taking the average value of the remaining) and the value of the next cycle (removing the maximum and minimum values of the ten points and taking the average value of the remaining) at that time point in the last ten days, and calculating the average of the two as the judgment value at that time point. For the host or slave, if the total output current of the power conversion unit is greater than the judgment value, the power conversion unit is controlled to reduce the output voltage or reduce the output current. This is done until the total output current value of the power unit of the host or slave is no greater than the judgment value.

[0076] Preferably, when the output current of the power conversion unit is greater than the maximum output current after the communication is disconnected, in order to quickly reach a stable state, the control strategy is adjusted as follows: Figure 8 When the total output current of the power conversion unit is greater than N (1.1 <= N <= 1.4, the same below) times the judgment value, the power conversion unit is controlled to reduce the output current to the original output current minus half of the excess; when the total output current of the power conversion unit does not exceed N times the judgment value, the output voltage of the power conversion unit is reduced by a minimum step size.

[0077] Figure 9 This is a flow chart for controlling battery current in an embodiment of the present invention. When communication is disconnected, the communication power supply parallel system, because both the master and slave devices store their respective maximum output currents and can also collect their own input and output information in real time, can calculate reasonable output voltage and current information based on their respective maximum output currents and collected information, ensuring normal operation of the communication load and proper charging of the battery, and preventing battery overcharging. This reduces hardware costs and improves system reliability.

[0078] Obviously, those skilled in the art will appreciate that the various modules or steps of the present invention described above can be implemented using a general-purpose computing device, centralized on a single computing device, or distributed across a network of multiple computing devices. Alternatively, they can be implemented using program code executable by a computing device, which can then be stored in a storage device and executed by the computing device. In some cases, the steps shown or described can be performed in a different order than that shown, or can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0079] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A power control method, characterized in that: include: determining that communication between the first power source and the second power source is interrupted; Determining and pre-storing a maximum output parameter based on power parameters of a local power supply, wherein the local power supply includes the first power supply and the second power supply; determining the maximum output parameter based on the power parameters of the local power supply includes: obtaining an average value of the power parameter of a previous cycle value and an average value of the power parameter of a subsequent cycle value at a time point corresponding to the communication interruption in a preset time period, and calculating the average value of the two as the maximum output parameter at the time point of the communication interruption; The local output power is controlled according to the pre-stored maximum output parameter.

2. The method according to claim 1, characterized in that Controlling local output power based on pre-stored maximum output parameters includes: While ensuring that the battery current of the local power supply is not greater than the charging limit current, the pre-stored maximum output parameter is used as the total output parameter of the power conversion unit, wherein the local power supply is connected to the battery and the power conversion unit, and the local power supply is the first power supply or the second power supply.

3. The method according to claim 1, characterized in that The maximum output parameter includes at least one of the following: maximum output current, maximum output voltage, and maximum output power.

4. A power control device, characterized in that: include: a determination module, configured to determine that communication between the first power source and the second power source is interrupted; a calculation module, configured to determine and pre-store a maximum output parameter based on power parameters of a local power source, wherein the local power source includes the first power source and the second power source; determining the maximum output parameter based on the power parameters of the local power source includes: obtaining an average value of the power parameter of a previous cycle value and an average value of the power parameter of a subsequent cycle value at a time point corresponding to the communication interruption in a preset time period, and calculating the average value of the two values as the maximum output parameter at the time point of the communication interruption; The control module is used to control the local output power according to the pre-stored maximum output parameters.

5. A power supply system comprising: The first power supply and the second power supply are characterized in that: The first power supply includes: a first management unit, configured to determine that communication between the first power source and the second power source is interrupted; a first power output unit, connected to the first management unit, and configured to control the output power of the first power supply according to a pre-stored first maximum output parameter when communication between the first power supply and the second power supply is interrupted, wherein the first maximum output parameter is determined and pre-stored based on power parameters of the first power supply and the second power supply, including: obtaining an average value of the power parameter of a previous cycle value and an average value of the power parameter of a subsequent cycle value at a time point corresponding to the communication interruption in a preset time period, and calculating the average value of the two as the first maximum output parameter at the time point of the communication interruption; The second power supply includes: a second management unit, configured to determine that communication between the second power source and the first power source is interrupted; A second power output unit is connected to the second management unit and is used to control the output power of the second power supply according to a pre-stored second maximum output parameter when the communication between the second power supply and the first power supply is interrupted, wherein the second maximum output parameter is determined and pre-stored based on the power parameter of the second power supply, including: obtaining the average value of the power parameter of the previous cycle value and the average value of the power parameter of the next cycle value at the time point corresponding to the communication interruption moment in a preset time period, and calculating the average value of the two as the second maximum output parameter at the time point of the communication interruption.

6. The system according to claim 5, characterized in that When the communication between the first power supply and the second power supply is normal, the positive busbar and the negative busbar between the first power supply and the second power supply are connected through a cable, and the first management unit and the second management unit are connected through a signal line.

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