WO2011075062A1 - Power supply system for radio base station - Google Patents

Power supply system for radio base station Download PDF

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Publication number
WO2011075062A1
WO2011075062A1 PCT/SE2010/051394 SE2010051394W WO2011075062A1 WO 2011075062 A1 WO2011075062 A1 WO 2011075062A1 SE 2010051394 W SE2010051394 W SE 2010051394W WO 2011075062 A1 WO2011075062 A1 WO 2011075062A1
Authority
WO
WIPO (PCT)
Prior art keywords
battery set
base station
radio base
energy source
energy level
Prior art date
Application number
PCT/SE2010/051394
Other languages
French (fr)
Inventor
Krister Thour
Lars Gunnar Skogberg
Original Assignee
Sitetel Sweden Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sitetel Sweden Ab filed Critical Sitetel Sweden Ab
Priority to EA201290521A priority Critical patent/EA201290521A1/en
Priority to AP2012006364A priority patent/AP2012006364A0/en
Publication of WO2011075062A1 publication Critical patent/WO2011075062A1/en

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Classifications

    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • H02J3/472—For selectively connecting the AC sources in a particular order, e.g. sequential, alternating or subsets of sources
    • 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
    • H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
    • H02J7/1423—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle with multiple batteries
    • 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
    • H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
    • H02J7/1438—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle in combination with power supplies for loads other than batteries
    • 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
    • H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
    • H02J7/1469—Regulation of the charging current or voltage otherwise than by variation of field
    • H02J7/1492—Regulation of the charging current or voltage otherwise than by variation of field by means of controlling devices between the generator output and 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
    • H02J7/32—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from a charging set comprising a non-electric prime mover rotating at constant speed
    • 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
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/10—The dispersed energy generation being of fossil origin, e.g. diesel generators
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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
    • H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
    • H02J7/143—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle with multiple generators
    • 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
    • H02J9/08—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 requiring starting of a prime-mover
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention relates to a method for supplying power to a radio base station, comprising the steps of controlling power supply to said radio base station from a battery set such that all power to the base station is supplied from the battery set and initiating charging of said battery set from an external energy source when the energy level of said battery set falls below a first preset energy level and terminating the charging when the energy level of said battery set exceeds a second preset energy level. Further the present invention relates to a controller for supplying energy to a radio base station and a system comprising such a controller.

Description

Power Supply System for Radio Base Station
Technical Field of the Invention
The present invention relates to the field of power supply to remote radio base stations.
Background Art
Radio base stations/Base Transceiver stations are generally powered by on-site power units if energy cannot be supplied directly to the radio base station. This is e.g. the case for radio base stations located in rough terrain or in other isolated locations, such as in remote communities that are served by poor roads and have poor infrastructure.
Commonly used power units used at such radio base stations are generators that run on diesel. However, using only diesel generators for supplying a radio base station has a number of drawbacks. The cost of diesel is significant and transporting diesel to the radio base station may both be challenging and expensive. Diesel generators also require regular refuelling and maintenance and further generate significant CO2 emissions.
To overcome some of these problems, hybrid solutions have been suggested as an alternative. In these solutions a battery set is generally included together with the diesel generator so that the radio base station can be provided with energy either from the generator or the battery. However, common hybrid systems at remote radio base stations may have limited performance since repeated battery replacement is required. Further, the voltage supplied to the radio base station may be irregular and exhibit dips as the hybrid system switches from supplying power from the generator to supplying power from the battery and vice versa.
Another solution is suggested in EP 1 610 571 , which discloses a radio base station that comprises a plant for generating electric energy from the wind or the sun. The radio base station may be supplied with energy from the plant, but as such an energy supply is dependent on weather conditions, the base station is also equipped with a battery set that may co-operate with the plant and hence function as a backup system for powering the radio base station. To summarize, alternative solutions for supplying power to remote radio base stations are needed in the art.
Summary of the Invention
An object of the invention is to provide a solution for supplying power to a radio base station.
In a first aspect of the invention, there is provided a method for supplying power to a radio base station, comprising the steps of controlling power supply to the radio base station from a battery set such that all power to the base station is supplied from the battery set; and initiating charging of the battery set from an external energy source when the energy level of the battery set falls below a first preset energy level and terminating the charging when the energy level of the battery set exceeds a second preset energy level.
In a second aspect of the invention, there is provided a controller for supplying power to a radio base station, comprising means for controlling power supply to the radio base station from a battery set such that all power to the base station is supplied from the battery set; and means for initiating charging of the battery set from an external energy source when the energy level of the battery set falls below a first preset energy level and terminating the charging when the energy level of the battery set exceeds a second preset energy level.
In the context of the present disclosure, a battery set may be a single battery or several batteries, which may be coupled in series so as to operate as a single battery.
According to the present disclosure, the power supply to the radio base station is controlled such that all power is supplied solely from a battery set. That is, the supply of power to the radio base station is not switched between different energy sources, but is solely supplied from a battery set. This is advantageous since it provides for an uninterrupted power distribution to the radio base station as well as a reduced CO2 emission.
From the perspective of the battery set, a radio base station constitutes an unpredictable load that may vary over time. Thus, during periods of low load, less power is needed from the battery set, which means that the energy level of the battery set decreases more slowly compared to periods of high load. As a response to the unpredictable load of the radio base station, the inventors have found that it is advantageous to initiate charging of the battery in response to the energy level of the battery instead of initiating charging of the battery after a certain predeternnined period of time, since it may ascertain that charging is initiated when the battery level is low, i.e. when charging indeed is required, which increases the capacity and lifetime of the battery set. This, in turn, decreases the frequency at which the battery set needs to be replaced.
By initiating charging of the battery set as the energy level falls below a preset energy level, the charge level of the batteries is controlled such that complete discharge of the battery set may be prevented. This provides for an energy supply to the radio base station solely from the battery set. Moreover, by terminating charging of the battery set when the energy level of the battery is above a preset value provides for prevention of unnecessarily use of the external energy source. The first preset energy level may for example be about 40 % or less, such as 30 %, such as 20 %, such as 10 %, such as 5 % of the maximum energy level of the battery set. Further, the second preset energy level may for example be about 60 % or more, such as 70 %, such as 80 % such as 90 %, such as 95 % of the maximum energy level of the battery set. The first and second preset energy levels may depend on the type of battery used in the battery set.
According to the present disclosure, the external energy source is used for charging the battery, and is typically used, i.e. switched on, only during charging of the battery set. However, during charging of the battery set, the radio base station is still supplied with power from the battery set.
Further, the method and controller according to the present invention may be used for supplying power to equipment in other applications, such as supplying power to other telecom equipment, military telecom equipment, pumps for water distribution, medical equipment or to households or buildings in rough terrain or in other isolated locations, such as households or buildings in remote communities that are served by poor roads and have poor infrastructure.
In embodiments of the present invention, power is also supplied to the battery set from at least one alternative energy source. An alternative energy source refers to an energy source that derives energy from the sun, wind, waves, or other natural renewable sources. As an example, the alternative energy source may be at least one wind energy source and/or at least one solar energy source. If an alternative energy source is used, it may supply power to the battery set and thus provide for charging of the battery set less frequently. The at least one alternative energy source may supply power to the battery set both during charging of the battery set and in the time period during which the battery set is not charged. The alternative energy source may have variations in the generated power levels during time, i.e. due to variations in the weather conditions, and the power supply to the battery set from the at least one alternative energy source may thus vary during time.
In an embodiment of the present invention, the energy level of the battery set is estimated. It is advantageous to estimate the energy level of the battery set, since it provides for determining when the battery set needs to be charged. The step of estimating the energy level may be performed during both the step of controlling the power supply and during charging of the battery set. As an example, estimating the energy level may be performed at a frequency of about once every 30 minutes, once every hour, once every 12 hours, once every 24 hours or once every 48 hours. Further, estimating the energy level of the battery set may comprise measuring the energy delivered to the battery set and the energy supplied from the battery set.
Measuring the energy delivered to the battery set and the energy supplied by the battery set at specific points in time provides for an estimation of the net energy consumed by the battery. By estimating the net energy consumed by the battery set at a specific frequency thus provides for an estimation of the total consumed energy, and subtracting the total consumed energy from the energy of a fully charged battery allows for an estimation of the energy level of the battery set. The energy delivered to the battery set and the energy supplied from the battery set may be measured by determining the current entering the battery set and the current leaving the battery set, i.e. the current drain over time, as well as the voltage drop over the battery set. Hence, the energy level of the battery set may be estimated by "Coulomb counting", in which the charge transferred in and out of the battery set is obtained by accumulating the current drain over time. "Coulomb counting" is a method known to the skilled person.
Further, the estimation of the energy level of the battery may be aided by the use of look-up tables constructed from measured discharging data of the battery set. The look-up table may contain detailed information of the discharging characteristics of a battery set and may relate the energy level of the battery with measured currents to and from the battery set and/or a voltage measured over the battery set. Such a look-up table may be constructed by carefully measuring the discharging characteristics of a population of battery sets at specific conditions to get statistically significant results, and the results from the population of battery sets may then be used as a template in the look-up table for all battery sets in the population. The look-up table may also contain information about the energy level of a fully charged battery set. Look-up tables of the energy level of a battery set are also known to a person skilled in the art.
The energy level of the battery set may also be estimated by other known methods, such as by measuring the battery cell impedance at a specific frequency. The impedance of the battery set may be measured by sending a high-frequency voltage signal to the battery set.
In embodiments, the controller comprises means for estimating the energy delivered to the battery set and the energy supplied from the battery set, such as means for measuring the current to and from the battery set and/or the voltage over the battery set.
In embodiments of the present invention, the external energy source is a generator, such as a diesel generator. The diesel generator may for example have a maximum output power of above 5 kW, such as above 6 kW, such as above 7 kW, such as above 8 kW, such as above 9 kW, such as above 10 kW. A diesel generator may provide the battery set with high power, thus decreasing the time during which the battery set is charged.
In embodiments of the present invention, the external energy source is operated at maximum or nearly maximum power during charging of the battery set. Further, in embodiments, the external energy source is operated at optimum or nearly optimum power during charging of the battery set.
Operating the external energy source at or near maximum or optimum power decreases the time during which the battery set is charged, i.e. the time during which the external energy source needs to be in use or operated, which may lead to decreased pollution from the external energy source.
In embodiments of the first aspect, the average time of charging the battery set is shorter than the average time during which the battery set is not charged.
Consequently, this means that the external energy source is in use during shorter periods of time compared to the periods of time when the external energy source is not in use. The average time may for example be the average time during a week or a month. This provides for a decreased use of the external energy source, which may lead to less pollution from the system. If the external energy source is operated near the maximum output power, it provides for a faster charging the battery set, which thus may facilitate that the average time of charging the battery set is shorter than the average time during which the battery set is not charged.
The controller typically comprises one or more microprocessors or some other device with computing capabilities, e.g. an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), a complex programmable logic device (CPLD), etc., in order control power supply and charging of the battery set, while executing appropriate downloadable software stored in a suitable storage area, such as a RAM, a Flash memory or a hard disk.
It is to be noted that by combining the controller and battery set, a complete power supply system may be provided.
Thus, the controller and the battery set may be provided as an integrated system, such as in a cabinet, which facilitates handling of the system and implementation of the controller and the battery set with an external energy source and a radio base station.
Further, the system may comprise the external energy source.
Consequently, the controller, the battery set and the external energy source may be provided as an integrated system, such as in a cabinet.
As described above, the external energy source may be a generator, such as a diesel generator. As an example, the maximum output power of the external energy source may exceed the average load of the radio base station.
For example, the maximum output power of the external energy source may be at least two times higher, such as at least three times higher, such as at least four times higher, such as at least five times higher, than the average load of the radio base station. The average load of the radio base station may for example be the average load during the course of 24 hours. If the maximum output power of the external energy source exceeds the average load of the battery set, it increases the rate at which the battery set is charged.
The system may further comprise at least one alternative energy source, and the controller may further comprise means for controlling power supply to the battery set from the alternative energy source. An alternative energy source may be an alternative energy source as described hereinabove. If the system further comprises an alternative energy source and the battery set can be supplied with energy from the alternative energy source, it may decrease the frequency at which the battery set needs to be charged.
In embodiments, the system further comprises the radio base station.
Furhter, in an aspect of the present invention, there is provided a computer program product comprising computer-executable components for causing a device to perform the steps of the method according to the present disclosure, when the computer-executable components are run on a processing unit included in the device.
Brief description of the drawings Figure 1 shows an overview of a system according to the present disclosure in a first exemplary embodiment.
Figure 2 shows an overview of the power supply to a radio base station from the system as seen in Fig. 1 .
Figure 3 shows an overview of a system according to the present disclosure in a second exemplary embodiment.
Figure 4 shows an overview of the power supply to a radio base station from the system as seen in Fig. 3.
Detailed description of the Invention
An exemplary embodiment of a system according to the present disclosure is functionally illustrated in Figure 1 . The system comprises a remote radio base station (1 ), a control unit (2), a diesel generator (3) and a battery set (4). The control unit (2) is arranged to control that the radio base station (1 ) is supplied solely with output power from the battery set (4) and arranged with means for switching the generator (3) on and off. The diesel generator (3) is arranged such that output power Pgen from the generator may be used for charging the battery set (4). Power supply P|0ad to the radio base station (1 ) is illustrated in Figure 2. During time interval tb, the diesel generator (3) is turned off and the radio base station (1 ) is supplied with energy P|0ad from the battery set (4). The load of the radio base station (1 ) is e.g. dependent on how many calls that are managed by the radio base station (1 ), which means that the load may fluctuate during the course of 24 hours, e.g. such that the load is lower during night time. As an example, P|0ad may fluctuate around 2 kW, such that the average load is 2 kW. However, during the course of 24 hours, the load may fluctuate between 0.5-2.5 kW.
The control unit (2) measures the current to and from the battery set (4) and the voltage over the battery set (4), so as to estimate the energy delivered to the battery set (4) and the energy supplied by the battery set (4). From these measurements, the consumed energy is estimated. The estimation of the consumed energy is performed once every 12 hours.
Consequently, by estimating the consumed energy at a frequency of about every 12 hours and comparing with the initial energy level of the battery, the control unit (2) may estimate the energy level of the battery set (4). When the control unit (2) estimates that the energy level of the battery is less than e.g. 10 % of the maximum energy level of the battery, the control unit (2) initiates charging of the battery set by starting the generator and supplying output energy Pgen from the generator (3) to the battery set. The diesel generator (3) used may have a maximum output power that exceeds the average power supplied to the radio base station. As an example, the diesel generator (3) may have a maximum output energy of 10 kW. The diesel generator (3) may be operated at maximum output when charging the battery, which allows supplying power to the radio base station from the battery. Charging proceeds during tr and the control unit (2) estimates the energy level of the battery set during tr. When the control unit (2) estimates that the battery set has an energy level that exceeds a preset value, such as about 90% of the maximum energy level of the battery, the control unit (2) turns off the diesel generator (3). During tr, the radio base station is still supplied with power from the battery since the battery charging is initiated before the battery set is completely discharged. This means that power is continuously supplied to the radio base station (1 ), i.e. the radio base station (1 ) experiences no
disruptions in supplied energy as the battery set is charged.
The time during which the battery set does not require charging, i.e. tb, depends on the fluctuations in P|0ad of the radio base station (1 ). This means that tb may fluctuate during the course of days or weeks. However, if the generator (3) is operated at maximum output energy during charging, the time for charging the battery set (4) is more or less constant, i.e. tr is more or less constant. If, as described above, a diesel generator (3) of 10 kW is used, it may take about 2.5 hours to charging the battery set (4), i.e. tr may be around 2.5 hours. During normal operation of the radio base station (1 ), tb is usually longer than tr. This means that during the course of e.g. a week, the time during which the diesel generator (3) is running is shorter than the time during which the generator is turned off, which leads to little CO2 emissions.
A second exemplary embodiment of the present invention is functionally illustrated in Figure 3. As in the first exemplary embodiment, the system comprises a remote radio base station (1 ), a control unit (2), a diesel generator (3) and a battery set (4). Further, an alternative energy source (5) is connected to the system and arranged so it may supply power Pait to the battery, both during charging of the battery set and when the battery set does not require charging. A skilled person understands how to connect an alternative energy source such that it can supply power to a battery set. The source for alternative energy (5) may be a solar energy source, such as photovoltaic cells, or a wind energy source, such as wind turbines. The control unit (2) controls that the radio base station (1 ) is supplied solely with output power from the battery set (4). An overview of the power supply P|0ad to the radio base station (1 ) is shown in Figure 4. Charging of the battery set is initiated as described in the first exemplary embodiment above, so that output power Pgen is used for charging the battery set. However, since the alternative energy source (5) supplies power to the battery set, charging is required less frequently compared to the first exemplary embodiment. Thus, as seen in Fig. 4, tr occurs less frequently compared to tr in Fig. 2. Further, since power Pait is supplied to the battery set from the alternative energy source also during charging of the battery set, the time tr during which charging proceeds in the second exemplary embodiment (see Fig. 4) is shorter compared to the time during which charging proceeds in the first exemplary embodiment (see Fig. 2).

Claims

1 . A method for supplying power to a radio base station, comprising the steps of:
controlling power supply to said radio base station from a battery set such that all power to the base station is supplied from the battery set; and initiating charging of said battery set from an external energy source when the energy level of said battery set falls below a first preset energy level and terminating the charging when the energy level of said battery set exceeds a second preset energy level.
2. A method according to claim 1 , further comprising supplying power to said battery set from at least one alternative energy source.
3. A method according to claim 2, wherein said alternative energy source is at least one wind energy source and/or at least one solar energy source.
4. A method according to any one of claims 1 -3, further comprising the step of estimating the energy level of said battery set.
5. A method according to claim 4, wherein the step of estimating the energy level of said battery set comprises measuring the energy delivered to the battery set and the energy supplied from the battery set.
6. A method according to any one of claims 1 -5, wherein said external energy source is a generator.
7. A method according to any previous claim, wherein the average time of charging said battery set is shorter than the average time during which the battery set is not charged.
8. A controller for supplying power to a radio base station, comprising:
means for controlling power supply to said radio base station from a battery set such that all power to the base station is supplied from the battery set; and
means for initiating charging of said battery set from an external energy source when the energy level of said battery set falls below a first preset energy level and terminating the charging when the energy level of said battery set exceeds a second preset energy level.
9. A system for supplying power to a radio base station, said system comprising the controller of claim 2, and further comprising:
a battery set for supplying power to the base station.
10. The system according to claim 9, further comprising said external energy source.
1 1 . The system according to claim 9 or 10, wherein the maximum output power of said external energy source exceeds the average load of said radio base station.
12. The system according to any one of claims 9-1 1 , further comprising at least one alternative energy source, and said controller further comprises means for controlling power supply to said battery set from said alternative energy source.
13. The system according to any one of claims 9-12, further comprising said radio base station.
14. A computer program product comprising computer-executable
components for causing a device to perform the steps recited in any one of claims 1 -7 when the computer-executable components are run on a processing unit included in the device.
PCT/SE2010/051394 2009-12-17 2010-12-16 Power supply system for radio base station WO2011075062A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EA201290521A EA201290521A1 (en) 2009-12-17 2010-12-16 POWER SUPPLY SYSTEM FOR BASIC RADIO
AP2012006364A AP2012006364A0 (en) 2009-12-17 2010-12-16 Power supply system for radio base station

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0950979-5 2009-12-17
SE0950979A SE534553C2 (en) 2009-12-17 2009-12-17 Method, control device, system and computer program product for power supply of a radio base station

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WO2011075062A1 true WO2011075062A1 (en) 2011-06-23

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EA (1) EA201290521A1 (en)
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EP3439437A3 (en) * 2017-07-31 2019-03-06 Clark Equipment Company Light system and method of powering the same
US10794551B2 (en) 2017-07-31 2020-10-06 Clark Equipment Company Light system and method of powering the same

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EA201290521A1 (en) 2013-01-30
SE534553C2 (en) 2011-10-04
SE0950979A1 (en) 2011-06-18
AP2012006364A0 (en) 2012-08-31

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