CN116154941A - Uninterruptible power supply system and control method thereof - Google Patents

Uninterruptible power supply system and control method thereof Download PDF

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Publication number
CN116154941A
CN116154941A CN202111390138.3A CN202111390138A CN116154941A CN 116154941 A CN116154941 A CN 116154941A CN 202111390138 A CN202111390138 A CN 202111390138A CN 116154941 A CN116154941 A CN 116154941A
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Prior art keywords
power supply
storage battery
power
battery pack
load
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CN202111390138.3A
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Chinese (zh)
Inventor
王凯
季明明
王雯婷
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Vertiv Tech Co Ltd
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Vertiv Tech Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00036—Charger exchanging data with battery
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads

Abstract

The invention relates to an uninterruptible power supply system and a control method thereof. The uninterruptible power supply system includes: the device comprises an AC/DC converter, at least two storage battery power supply modules and a control module; the input end of the AD/DC converter receives alternating voltage, the output end of the AD/DC converter is connected with the first direct current bus and outputs constant output voltage to supply power for a load; the first end of the storage battery power supply module is connected with the first direct current bus, and the second end of the storage battery power supply module is connected with the second direct current bus; each storage battery power supply module comprises a storage battery pack, a DC/DC converter and a circuit breaker which are connected in series; the control module is in communication with each of the battery power modules to control the battery power modules to power the load when the alternating voltage fails. The invention can simply and effectively improve the circuit efficiency and reduce the use threshold of the storage battery.

Description

Uninterruptible power supply system and control method thereof
Technical Field
The present invention relates to the field of power supplies, and more particularly, to an uninterruptible power supply system and a control method thereof.
Background
For conventional uninterruptible power systems, such as communication power systems, an AC/DC rectifier, a battery, and a DC load are connected in parallel on the same DC bus. When the alternating current power supply is normal, the AC/DC rectifier carries a direct current load, and the storage battery is charged through the direct current bus. When the alternating current power supply fails, the storage battery runs through the direct current bus with the load direct current load. And when the voltage is gradually reduced to the set protection fixed value in the discharging process of the storage battery, the protection device cuts off the power supply of the storage battery. Therefore, the DC bus voltage of the communication power supply system is generally set to a wide voltage range, for example, a voltage range of 43.2V-57.6V DC bus to satisfy the voltage variation during discharging and charging of the battery, so that the output voltage range of the AC/DC rectifier is also set to the same wide voltage range.
The current conventional solution has several drawbacks:
1. because of the voltage requirement of charging and discharging the storage battery, the AC/DC rectifier must be designed into direct current wide-range output, thereby increasing the complexity and cost of the circuit and reducing the AC/DC conversion efficiency.
2. All the storage batteries are connected to the same direct current bus and are charged and discharged simultaneously, so that the requirements on the storage batteries are high, the storage batteries with different types and different discharging depths cannot be used, the storage batteries cannot be managed in groups, and the echelon utilization of the storage batteries is not met.
Disclosure of Invention
The invention aims to solve the technical problem of providing an uninterruptible power supply system and a control method thereof, wherein the uninterruptible power supply system can simply and effectively improve the circuit efficiency and reduce the using threshold of a storage battery.
The technical scheme adopted for solving the technical problems is as follows: an uninterruptible power supply system is constructed, comprising: the device comprises an AC/DC converter, at least two storage battery power supply modules and a control module; the input end of the AD/DC converter receives alternating voltage, the output end of the AD/DC converter is connected with the first direct current bus and outputs constant output voltage to supply power for a load; the first end of the storage battery power supply module is connected with the first direct current bus, and the second end of the storage battery power supply module is connected with the second direct current bus; each storage battery power supply module comprises a storage battery pack, a DC/DC converter and a circuit breaker which are connected in series; the control module is in communication with each of the battery power modules to control the battery power modules to power the load when the alternating voltage fails.
In the uninterruptible power supply system of the present invention, the control module further includes:
the sampling unit is used for sampling the residual electric quantity of each storage battery pack when the storage battery packs of the storage battery power supply modules are different and the storage battery packs supply power to the load;
the priority unit is used for obtaining the power supply priority level of each storage battery pack for the load according to the residual electric quantity;
the proportioning unit is used for proportioning and calculating the output power of each storage battery pack according to the actual power demand of the load and the order of the power supply priority level from high to low;
and the control unit is used for controlling the output power of each storage battery pack according to the proportioning calculation result.
In the uninterruptible power supply system of the invention, the higher the power supply priority level is, the larger the output power of the storage battery pack occupies the proportion of the actual power demand is.
In the uninterruptible power supply system of the invention, the circuit breaker is a solid-state circuit breaker, the constant output voltage is 58V, and the uninterruptible power supply system is a communication power supply system.
The invention solves another technical scheme adopted by the technical problem that the invention constructs a control method of an uninterruptible power supply system, wherein the uninterruptible power supply system comprises an AC/DC converter, at least two storage battery power supply modules and a control module; the input end of the AD/DC converter receives alternating voltage, and the output end of the AD/DC converter is connected with a first direct current bus; the first end of the storage battery power supply module is connected with the first direct current bus, and the second end of the storage battery power supply module is connected with the second direct current bus; the control module is in communication connection with each storage battery power supply module; each storage battery power supply module comprises a storage battery pack, a DC/DC converter and a circuit breaker which are connected in series;
the control method of the uninterruptible power supply system comprises the following steps:
s1, detecting whether the alternating voltage is normal, if yes, executing a step S2, otherwise, executing a step S3;
s2, controlling the AC/DC converter to output constant output voltage to supply power for a load;
and S3, controlling each storage battery power supply module to supply power for the load.
In the control method of the uninterruptible power supply system of the present invention, the step S3 further includes:
s31, sampling the residual electric quantity of each storage battery pack;
s32, obtaining the power supply priority level of each storage battery pack for the load according to the residual electric quantity;
s33, calculating the output power of each storage battery pack according to the actual power demand of the load and the order of the power supply priority from high to low;
and S34, controlling the output power of each storage battery pack according to the proportioning calculation result.
In the control method of the uninterruptible power supply system, the higher the power supply priority level is, the larger the proportion of the output power of the storage battery pack to the actual power demand is.
In the control method of the uninterruptible power supply system, the type of the breaker is selected based on the following steps:
SA, calculating the short-circuit current of each storage battery power supply module based on the device parameters of the storage battery power supply module;
SB, inquiring a shedding curve of the circuit breaker based on the short-circuit current to obtain the tripping time of the circuit breaker;
and SC, selecting the type of the circuit breaker according to the tripping time.
In the control method of the uninterruptible power supply system according to the present invention, in the step SA, the short-circuit current is calculated based on the following formula:
Figure BDA0003366452590000031
wherein I is k Represents short-circuit current, n represents the number of storage batteries in the storage battery pack, U n Represents the nominal voltage of the accumulator, r b Represents the internal resistance of the storage battery, r 1 Represents the internal resistance of the connecting strip of the accumulator power supply module, r c Representing the internal resistance of the connecting cable of the accumulator power supply module r 2 Representing the internal resistance of the circuit breaker.
In the control method of the uninterruptible power supply system, in the step SC, a solid-state circuit breaker is selected; the constant output voltage is 58V, and the uninterruptible power supply system is a communication power supply system.
The uninterrupted power supply system and the control method thereof can be respectively managed through the corresponding DC/DC converter 210, so that the uninterrupted power supply system can be connected into storage battery packs of different types and states, does not have unified requirements on the capacity, the depth of discharge, the voltage and the like of the batteries, can realize gradient utilization of the batteries, greatly improves the reliability of standby power and reduces the cost of the batteries. Furthermore, the control module can be used for optimally controlling the output power of each storage battery pack. Furthermore, the solid-state circuit breaker can utilize the microsecond protection speed and the current rising edge protection characteristic to timely cut off a fault loop, so that the normal operation of a system and a load is ensured.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic circuit diagram of a preferred embodiment of the uninterruptible power supply system of the present invention;
FIG. 2 is a functional block diagram of a preferred embodiment of a control module 300 of the uninterruptible power supply system of the present invention;
FIG. 3 is a flow chart of a preferred embodiment of a control method of the uninterruptible power supply system of the present invention;
FIG. 4 is a flow chart of battery power module power control of the control method of the uninterruptible power supply system of the present invention;
fig. 5 is a flowchart of a type selection procedure of a circuit breaker of the control method of the uninterruptible power supply system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Fig. 1 is a circuit schematic of a preferred embodiment of the uninterruptible power supply system of the present invention. As shown in fig. 1, the uninterruptible power supply system, which is preferably a communication power supply system, includes: an AC/DC converter 100, at least two battery-operated modules 200, and a control module 300. As shown in fig. 1, the AD/DC converter 100 has an input receiving 220 v ac voltage and an output connected to a DC bus DC-. The battery power module 200 has a first end connected to the direct current bus DC-, and a second end connected to the direct current bus dc+. A plurality of loads (e.g. load 1, load 2, etc.) etc. are connected between the direct current bus DC-and the direct current bus dc+. Accordingly, both the AD/DC converter 100 and the battery power module 200 may power a plurality of loads (e.g., load 1, load 2, etc.) through the DC bus DC-and dc+ bus. In the present preferred embodiment, only two battery power supply modules 200 are shown, and in practice, the number of battery power supply modules 200 may be designed according to the standby time of the uninterruptible power supply system, which may be any number. In the present invention, each of the battery power modules 200 includes a battery pack 230, a DC/DC converter 210, and a circuit breaker 220 connected in series. The control module 300 is communicatively coupled to each of the battery power modules 200 to control the power thereof to power the plurality of loads (e.g., load 1, load 2, etc.) when the ac voltage fails.
Specifically, when the utility power is normally supplied, the 220 v AC voltage is converted into a DC voltage by the AC/DC converter 100, and is connected to the DC buses dc+ and DC-, so as to supply power to each DC load. Meanwhile, each battery pack 230 is connected to the direct current buses dc+ and DC through the circuit breaker 220 and the DC/DC converter 210. In case of a mains failure, each storage battery pack 230 is connected to the direct current buses dc+ and DC through the circuit breaker 220 and the DC/DC converter 210 to supply power to each direct current load. In the present invention, the AC/DC converter 100 outputs a constant output voltage to power each direct current load. Preferably, the constant output voltage is 58V. Of course, in other preferred embodiments, other suitable values may be selected depending on the actual situation. Therefore, compared with a traditional uninterruptible power supply system adopting a wide-range output range, the efficiency of the AC/DC conversion circuit is improved by about 1 percent, the efficiency of the system is synchronously improved, and the effects of energy conservation and emission reduction are achieved. And because the direct current output voltage of the AC/DC converter 100 is constant, the electronic components can avoid working under the working condition of low voltage and high current, so the material cost of the AC/DC converter is reduced by about 5 percent.
Further, in the present invention, the first end of each of the battery power modules 200 is connected to the direct current bus DC-, and the second end is connected to the direct current bus dc+. Therefore, each storage battery 230 is connected to the DC bus dc+ and DC through the circuit breaker 220 and the DC/DC converter 210 connected in series, so that each storage battery 230 can be managed through the corresponding DC/DC converter 210, and therefore, storage battery packs of different types and states can be connected, the capacity, the depth of discharge, the voltage and the like of the battery are not required uniformly, the gradient utilization of the battery can be realized, the reliability of standby power is greatly improved, and the cost of the battery is reduced.
Because the output power of the various battery packs 230 is different, the control module 300 may be used to optimally control the output power of each battery pack in a preferred embodiment of the present invention in order to optimize the overall ups life and efficiency.
Fig. 2 is a functional block diagram of a preferred embodiment of a control module 300 of the uninterruptible power supply system of the present invention. As shown in fig. 2, the control module 300 further includes: a sampling unit 310, a priority unit 320, a proportioning unit 330 and a control unit 340. The sampling unit 310 is configured to sample a remaining power of each of the battery packs 230 when the battery packs 230 of the battery power supply module 200 are different and the battery packs 230 supply power to the plurality of loads (for example, load 1, load 2, etc.). The priority unit 320 is configured to obtain a power supply priority level of each storage battery pack 230 for the plurality of loads (for example, load 1, load 2, etc.) according to the remaining power. The proportioning unit 330 is configured to perform proportioning calculation on the output power of each storage battery pack 230 according to the actual power requirements of the plurality of loads (for example, load 1, load 2, etc.) from the high to the low power supply priority. The control unit 340 is configured to control the output power of each battery pack 230 according to the proportioning calculation result. In a preferred embodiment of the present invention, the higher the power priority level, the greater the ratio of the output power of the battery pack 230 to the actual power demand.
For example, if there are four battery power modules 200 in the ups system, four battery packs 230 may be used to power multiple loads (e.g., load 1, load 2, etc.). The first battery pack 230 may be composed of 10 lead-acid batteries with a remaining capacity of 400Ah, the second battery pack 230 may be composed of 1 lithium iron phosphate battery with a remaining capacity of 300Ah, the third battery pack 230 may be composed of 20 nickel-cadmium batteries with a remaining capacity of 800Ah, and the fourth battery pack 230 may be composed of 5 sodium-sulfur batteries with a remaining capacity of 500Ah. At this time, the power supply priority levels obtained from the remaining power thereof are ordered from high to low: third battery pack 230> fourth battery pack 230> first battery pack 230> second battery pack 230. At this time, it is assumed that the actual power demand of the plurality of loads (e.g., load 1, load 2, etc.) is 3KW. Then, in a preferred embodiment of the present invention, the first priority level may be set in advance, the first priority level may provide 40% of the actual power demand, the second priority level may provide 30% of the actual power demand, the third priority level may provide 20% of the actual power demand, and the fourth priority level may provide 10% of the actual power demand. Then, the set output power that each battery pack needs to supply is calculated based on the ratios of the respective levels set in advance. And finally, controlling the storage battery pack to output power according to the set output power based on the output power. In another preferred embodiment of the present invention, the set output power of each battery pack may also be calculated according to the ratio of the remaining capacity of the battery pack to the total remaining capacity, for example, the set output power of the first battery pack= (400×3kw)/(400+300+800+500). Of course, in other preferred embodiments of the present invention, other suitable methods of controlling the output power of each battery pack may be employed.
Further, in the preferred embodiment of the present invention, the sampling unit 310, the priority unit 320, the proportioning unit 330 and the control unit 340 may be implemented using any suitable modules, circuits or computer programs. The computer program referred to herein refers to: any expression, in any programming language, code or notation, of a set of instructions intended to cause a system having an information processing capability to perform a particular function either directly or after either or both of the following: a) Conversion to other languages, codes or symbols; b) Reproduced in a different format.
In the preferred embodiment of the present invention, the control module 300 may be a module that is separately provided, or may be integrated in an intelligent circuit breaker, so as to adaptively control the charging and discharging behavior within an expected range, thereby effectively implementing the charging and discharging functions of the battery charging and discharging circuit formed by the mains supply, the AC/DC converter and the battery power supply module.
Further, in the preferred embodiment shown in fig. 1, because the battery pack 230 is connected to the dc+ and DC-via the circuit breaker 220, when the battery output circuit fails, the short-circuit current provided by the battery pack 230 is insufficient to provide quick-break protection for the circuit breaker 220, which may retract the DC/DC converter current, reduce the voltage of the DC bus, load and monitor power loss, and even damage the battery pack 230.
Therefore, solid state circuit breakers are preferably employed herein. In this way, the storage battery pack 230 is connected to the direct current bus through the solid state circuit breaker, and when the short circuit current rises rapidly, the solid state circuit breaker can cut off the battery loop through the us-level electronic protection, so that the fault point is removed, and the safety of the system is ensured.
The following description is made of a battery pack composed of lead-acid batteries, and the relevant parameters are as follows.
Figure BDA0003366452590000071
The short circuit current Ik is calculated as follows:
Figure BDA0003366452590000072
at this time, if we calculate using a 125A battery breaker, ik=7.9in, in represents the input current, and according to In, the trip curve of the 125A battery breaker is queried, the trip time can reach 3 seconds at maximum, so that the bus voltage may be reduced, and the load and the monitoring power loss may be caused. Therefore, we select the solid state breaker, the disconnection time of the solid state breaker is microsecond level, so the battery loop can be cut off through microsecond level electronic protection, the fault point is removed, and the safety of the system is ensured.
Likewise, in a further preferred embodiment of the invention, a plurality of loads (e.g. load 1, load 2, etc.) may also be connected to the dc bus via the solid state circuit breaker. This is because when the storage battery in the storage battery pack 230 is operated with a load direct current load, if a short circuit occurs in the load circuit, the current limit of the DC/DC converter is retracted, so that the breaker of the load cannot be protected from quick disconnection, the bus voltage drops, and all loads and monitoring of power loss are caused. Therefore, in the preferred design, the load is protected by adopting a solid-state circuit breaker, and the fault loop is cut off in time by utilizing the us-level protection speed and the current rising edge protection characteristic of the solid-state circuit breaker, so that the normal operation of the system and the load is ensured.
Fig. 3 is a flow chart of a preferred embodiment of a control method of the uninterruptible power supply system of the present invention. In the preferred embodiment, the uninterruptible power supply system includes an AC/DC converter 100, at least two battery power modules 200, and a control module 300. The input end of the AD/DC converter 100 receives alternating voltage, and the output end is connected with a direct current bus DC-. The battery power module 200 has a first end connected to the direct current bus DC-, and a second end connected to the direct current bus dc+. The control module 300 is communicatively coupled to each of the battery powered modules 200. Each of the battery power modules 200 includes a battery pack 230, a DC/DC converter 210, and a circuit breaker 220 connected in series. Those skilled in the art will appreciate that the preferred embodiments of the uninterruptible power supply system described above are described with reference to fig. 1-2 and will not be discussed in detail herein. Here, the control module 300 may be provided at any suitable location, for example, at the AC/DC converter 100 side, at the battery power module 200 side, or therebetween, or at any other suitable location, as long as each of the battery power modules 200 is communicatively connected. The AC/DC converter 100, at least two battery powered modules 200, may be constructed using any suitable AC/DC converter and battery powered modules. And the control module 300 may be implemented using any suitable software, hardware, or combination of software and hardware, chip, or circuit configuration.
As shown in fig. 3, in step S1, it is detected whether the ac voltage is normal, if yes, step S2 is performed, otherwise step S3 is performed. In step S2, the AC/DC converter 100 is controlled to output a constant output voltage to supply power to a load. In step S3, the control module 300 controls each of the battery power modules 200 to supply power to the load.
Fig. 4 is a flowchart of a battery power supply module power supply control of the control method of the uninterruptible power supply system of the invention. As shown in fig. 4, in step S1, the remaining capacity of each of the battery packs is sampled. In step S2, a power supply priority level of each storage battery pack for the load is obtained according to the remaining power. In step S3, according to the actual power requirement of the load, the output power of each storage battery pack is calculated in proportion according to the order from high to low of the power supply priority level. In step S4, the output power of each battery pack is controlled according to the proportioning calculation result. The higher the power supply priority level, the larger the proportion of the output power of the storage battery pack to the actual power demand. The power supply control of the battery power supply module can be realized by the control module 300 shown in fig. 2 or by an intelligent circuit breaker. Reference is made to the preceding description for a specific implementation step, principle and effect, which are not further described here.
Fig. 5 is a flowchart of a type selection procedure of a circuit breaker of the control method of the uninterruptible power supply system of the present invention. As shown in fig. 5, the solid state circuit breaker may be selected according to the following steps. In step S1, the short-circuit current of each battery power module is calculated based on the device parameters thereof. As previously described, the short circuit current may be calculated based on the following formula:
Figure BDA0003366452590000092
wherein I is k Represents short-circuit current, n represents the number of storage batteries in the storage battery pack, U n Represents the nominal voltage of the accumulator, r b Represents the internal resistance of the storage battery, r 1 Represents the internal resistance of the connecting strip of the accumulator power supply module, r c Representing the internal resistance of the connecting cable of the accumulator power supply module r 2 Representing the internal resistance of the circuit breaker.
In step S2, a trip curve of the circuit breaker is queried based on the short-circuit current to obtain a trip time of the circuit breaker. For example, in the case of the lead-acid battery described above,
Figure BDA0003366452590000091
if we calculate with a 125A battery breaker, ik=7.9in, in represents the input current, and according to the trip curve of the In inquiry 125A battery breaker, the trip time can reach 3 seconds at maximum, thus the bus voltage can be reduced, and the load and the monitoring loss of electricity can be caused.
Therefore, in step S3, the type of the circuit breaker is selected to be a solid-state circuit breaker according to the trip time, and the trip time of the solid-state circuit breaker is at the microsecond level, so that the battery loop can be cut off through microsecond level electronic protection, the fault point is removed, and the safety of the system is ensured. Multiple loads (e.g., load 1, load 2, etc.) may also be connected to the dc bus via solid state circuit breakers. Reference is made to the preceding description for a specific implementation step, principle and effect, which are not further described here.
Thus, the present invention may be realized in hardware, software, or a combination of hardware and software. The invention may be implemented in a centralized fashion in at least one computer system or in a distributed fashion where different elements are spread across several interconnected computer systems. Any kind of computer system or other apparatus adapted for carrying out the methods of the invention is suited. The combination of hardware and software may be a general-purpose computer system with a computer program installed thereon, which, when executed, controls the computer system such that it carries out the methods of the present invention.
The present invention can also be realized by a computer program product, which comprises all the features enabling the implementation of the methods described herein, and which when installed in a computer system is able to carry out these methods. The computer program in this document refers to: any expression, in any programming language, code or notation, of a set of instructions intended to cause a system having an information processing capability to perform a particular function either directly or after either or both of the following: a) Conversion to other languages, codes or symbols; b) Reproduced in a different format.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims (10)

1. An uninterruptible power supply system, comprising: the device comprises an AC/DC converter, at least two storage battery power supply modules and a control module; the input end of the AD/DC converter receives alternating voltage, the output end of the AD/DC converter is connected with the first direct current bus and outputs constant output voltage to supply power for a load; the first end of the storage battery power supply module is connected with the first direct current bus, and the second end of the storage battery power supply module is connected with the second direct current bus; each storage battery power supply module comprises a storage battery pack, a DC/DC converter and a circuit breaker which are connected in series; the control module is in communication with each of the battery power modules to control the battery power modules to power the load when the alternating voltage fails.
2. The uninterruptible power supply system of claim 1, wherein the control module further comprises:
the sampling unit is used for sampling the residual electric quantity of each storage battery pack when the storage battery packs of the storage battery power supply modules are different and the storage battery packs supply power to the load;
the priority unit is used for obtaining the power supply priority level of each storage battery pack for the load according to the residual electric quantity;
the proportioning unit is used for proportioning and calculating the output power of each storage battery pack according to the actual power demand of the load and the order of the power supply priority level from high to low;
and the control unit is used for controlling the output power of each storage battery pack according to the proportioning calculation result.
3. The uninterruptible power supply system of claim 2, wherein the higher the power priority level, the greater the ratio of the output power of the battery pack to the actual power demand.
4. An uninterruptible power supply system according to any of claims 1 to 3, wherein the circuit breaker is a solid state circuit breaker, the constant output voltage is 58V, and the uninterruptible power supply system is a communication power supply system.
5. The control method of the uninterrupted power supply system is characterized in that the uninterrupted power supply system comprises an AC/DC converter, at least two storage battery power supply modules and a control module; the input end of the AD/DC converter receives alternating voltage, and the output end of the AD/DC converter is connected with a first direct current bus; the first end of the storage battery power supply module is connected with the first direct current bus, and the second end of the storage battery power supply module is connected with the second direct current bus; the control module is in communication connection with each storage battery power supply module; each storage battery power supply module comprises a storage battery pack, a DC/DC converter and a circuit breaker which are connected in series;
the control method of the uninterruptible power supply system comprises the following steps:
s1, detecting whether the alternating voltage is normal, if yes, executing a step S2, otherwise, executing a step S3;
s2, controlling the AC/DC converter to output constant output voltage to supply power for a load;
and S3, controlling each storage battery power supply module to supply power for the load.
6. The method of claim 5, wherein the step S3 further comprises:
s31, sampling the residual electric quantity of each storage battery pack;
s32, obtaining the power supply priority level of each storage battery pack for the load according to the residual electric quantity;
s33, calculating the output power of each storage battery pack according to the actual power demand of the load and the order of the power supply priority from high to low;
and S34, controlling the output power of each storage battery pack according to the proportioning calculation result.
7. The method according to claim 6, wherein the higher the power supply priority, the larger the ratio of the output power of the battery pack to the actual power demand.
8. The method of claim 5, further comprising selecting the type of circuit breaker based on:
SA, calculating the short-circuit current of each storage battery power supply module based on the device parameters of the storage battery power supply module;
SB, inquiring a shedding curve of the circuit breaker based on the short-circuit current to obtain the tripping time of the circuit breaker;
and SC, selecting the type of the circuit breaker according to the tripping time.
9. The control method of an uninterruptible power supply system according to claim 8, wherein in the step SA, the short-circuit current is calculated based on the following formula:
Figure FDA0003366452580000021
wherein I is k Represents short-circuit current, n represents the number of storage batteries in the storage battery pack, U n Represents the nominal voltage of the accumulator, r b Represents the internal resistance of the storage battery, r 1 Represents the internal resistance of the connecting strip of the accumulator power supply module, r c Representing the internal resistance of the connecting cable of the accumulator power supply module r 2 Representing the internal resistance of the circuit breaker.
10. The method of claim 9, wherein a solid state circuit breaker is selected in step SC; the constant output voltage is 58V, and the uninterruptible power supply system is a communication power supply system.
CN202111390138.3A 2021-11-22 2021-11-22 Uninterruptible power supply system and control method thereof Pending CN116154941A (en)

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