CN101847890B - Control method for enhancing adaptability of communication power supply to single-phase alternating-current power grid - Google Patents
Control method for enhancing adaptability of communication power supply to single-phase alternating-current power grid Download PDFInfo
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- CN101847890B CN101847890B CN2010101873967A CN201010187396A CN101847890B CN 101847890 B CN101847890 B CN 101847890B CN 2010101873967 A CN2010101873967 A CN 2010101873967A CN 201010187396 A CN201010187396 A CN 201010187396A CN 101847890 B CN101847890 B CN 101847890B
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Abstract
The invention discloses a control method for enhancing adaptability of a communication power supply to a single-phase alternating-current power grid, which is used in a communication power supply system provided with a direct-current power distribution unit, a battery pack, a monitoring unit and a plurality of parallel rectifier modules. The control method comprises the following steps: when the communication power supply system is started, under the control of the monitoring unit, one rectifier module is kept to operate, and other rectifier modules enter a stand-by state; and the output voltage of the rectifier modules is output from the battery pack voltage, kept for a period of time and gradually increased. Only one rectifier module is kept to operate, thereby enhancing the efficiency of the communication power supply system and reducing the alternating-current input current; and the output voltage of the rectifier module is output from the battery pack to be kept for a period of time and gradually increased, thereby achieving the goal of reducing the alternating-current impact current. By using the means above, the adaptability of the communication power supply system to the single-phase alternating-current power grid can be greatly enhanced, so that the communication power supply system can be still normally started and operate in an extremely severe single-phase alternating-current power grid environment.
Description
Technical field
The present invention relates to the communication power supply technical field, especially a kind of control method that improves the power supply system for communications for single phase alternating current (A.C.) electrical network adaptive capacity.
Background technology
When the AC network environment was abominable, possibly of the power supply system for communications can't operate as normal.Usually show as, behind the interchange incoming call, rectification module starts repeatedly, can't normally export.At this moment, battery can constantly discharge as stand-by power supply, and when the energy content of battery exhausts, will have civil power and the accident of communication equipment outage, and then can cause communication interruption.
The communication power supply field for the traditional method that improves single phase alternating current (A.C.) electrical network adaptive capacity is, when exchanging incoming call, makes rectification module begin output from cell voltage, and boosted output voltages gets into the charging current limiter state gradually.
But the power supply system for communications that has adopted above-mentioned control method is in some areas or cisco unity malfunction.Reason is that local single-phase line voltage is lower and unstable, and existing control method also is not enough to guarantee normal startup of power-supply system and operation.Research shows when theoretical equivalent resistance surpasses 10 ohm on the single-phase ac power supply circuit that the existing communication power-supply system can not guarantee reliable the startup and stable operation.
Therefore, improve the adaptive capacity of the power supply system for communications, have very realistic meanings the single phase alternating current (A.C.) electrical network.
Summary of the invention
Technical problem to be solved by this invention provides a kind of control method that improves adaptability of communication power supply to single-phase alternating-current power grid, accomplishes that the power supply system for communications also can be supplied power for communication equipment when single-phase civil power environment is very abominable.
The technological means that the present invention adopted is: a kind of control method that improves adaptability of communication power supply to single-phase alternating-current power grid; Be used to have Direct Current Distribution Unit, the power supply system for communications of battery pack, monitoring unit, a plurality of rectification module parallel with one another; The input of each rectification module is connected to the single phase alternating current (A.C.) electrical network, output is connected to Direct Current Distribution Unit; Direct Current Distribution Unit is connected with described battery pack and communication equipment; What said control method was primary is to guarantee that the power supply system for communications can normally start; The control method that is adopted is: when the power supply system for communications started, monitoring unit kept said rectification module operation, other rectification module to get into holding state, and holding state is meant that the direct current output of rectification module closes; The output voltage of rectification module begins output from battery voltage, keeps a period of time, raises gradually again.
Preferably, when the output voltage of rectification module begins to raise, rectification module is carried out Current limited Control.In detail; Said monitoring unit has: the parameter setting software module that is used to set the load protection current value; Said monitoring unit carries out Current limited Control according to the load protection current value to rectification module; Said load protection electric current is related with the nominal capacity of battery pack, and greater than the required electric current of said communication equipment actual motion, current single phase alternating current (A.C.) electrical network can be supported the pairing power of this load protection current value simultaneously.Said load protection current value is the 0.05C of battery pack nominal capacity
10～0.50C
10Between.When rectification module was carried out Current limited Control, the maximum of rectification module allowed output current=load protection current value * current voltage of battery pack rated voltage/battery pack.Adopt above-mentioned means, can keep the direct current power of rectification module stable, thereby guarantee that alternating current is stable, avoid the system oscillation imbalance that occurs owing to rectification module power is too high.
Preferably, said control method also comprises: in the power supply system for communications running, when each rectification module occurred starting phenomenon repeatedly, the output voltage that reduces each rectification module was the voltage of battery pack, and each rectification module is carried out Current limited Control.
In sum, the advantage that the present invention had is: when the power supply system for communications starts and during in abominable civil power environment long-time running, only keeps a rectification module operation, can improve the efficient of the power supply system for communications, reduce exchanging input current; When the power supply system for communications starts or disturbed and when starting repeatedly, the rectification module output voltage begins output from battery pack, avoids occurring exchanging impulse current; When the power supply system for communications started, the rectification module output voltage kept a period of time to raise gradually at battery voltage earlier again, also plays the purpose that further reduces to exchange impulse current.Through above-mentioned means, can significantly improve the adaptive capacity of the power supply system for communications for the single phase alternating current (A.C.) electrical network, it still can normally be started and move under extremely abominable single phase alternating current (A.C.) electrical network environment.
Description of drawings
Through the more specifically explanation of the preferred embodiments of the present invention shown in the accompanying drawing, above-mentioned and other purpose, characteristic and advantage of the present invention will be more clear.Reference numeral identical in whole accompanying drawings is indicated identical part.Painstakingly do not draw accompanying drawing, focus on illustrating purport of the present invention by actual size equal proportion convergent-divergent.
Fig. 1 is the structural representation of the power supply system for communications among the embodiment;
When Fig. 2 starts for the power supply system for communications, the voltage control scheme schematic diagram on the battery pack.
Embodiment
The power supply system for communications 1 that present embodiment was directed against; Can be referring to accompanying drawing 1; Mainly by constituting: a plurality of rectification modules parallel with one another 11 with the lower part; The input of each rectification module 11 is connected with Alternating Current Unit 10 respectively and is connected to single phase alternating current (A.C.) electrical network (being civil power) through Alternating Current Unit 10; The output of each rectification module 11 is connected to Direct Current Distribution Unit 12 respectively, and Direct Current Distribution Unit 12 links to each other with communication equipment 13, battery pack 14 and makes rectification module 11 to said communication equipment 13 and battery pack 14 power supplies; The monitoring unit 15 that is connected with each rectification module 11; Have in the said monitoring unit 15: be used to set the parameter setting software module 16 of load protection current value, this parameter setting software module 16 is that the mode with software program writes in the monitoring unit 15.The purpose that said load protection current value is set is that the dc output power of control rectification module 11 is in allowed band; As a rule; This load protection current value is associated with the nominal capacity of battery pack 14, and greater than the required electric current of said communication equipment 13 actual motions, current communication environment can be supported the pairing power of this load protection current value simultaneously; The engineer can rationally set according to actual conditions, for example can be the 0.05C of battery pack 14 nominal capacitys
10～0.50C
10Between.
When single-phase utility grid environment was abominable, the power supply system for communications 1 maybe operate as normal, therefore need improve its control method, and present embodiment is mainly from being optimized with lower angle:
(1) to guarantee that the power supply system for communications 1 normally moves, will guarantee that at first when AC starting, rectification module can normally start.The method that present embodiment adopted is that when AC starting, monitoring unit 15 only keeps 11 work of a rectification module, other rectification module 11 entering holding states; The VD of rectification module 11 begins output from battery voltage, keeps a period of time, the output voltage of the rectification module 11 that raises gradually again.
With reference to figure 2, be that the voltage on abscissa, the battery pack 14 is the controlling schemes schematic diagram that ordinate is drawn with time.At T1 constantly, AC dump, battery pack 14 gets into discharge condition, guarantees the operation of communication equipment 13; T2 constantly, AC starting, rectification module 11 of monitoring unit 15 controls is started working, and the VD of rectification module 11 equates that with the voltage V2 of battery pack 14 at this moment battery pack 14 is not charged; Through after a while, for example 20～100 seconds, arrive T3, the voltage of rectification module 11 begins to raise, and battery pack 14 begins charging.
Experiment finds that during for example greater than 10 ohm, AC network can't support a plurality of rectification modules 11 to get into operating state simultaneously when the line of AC network hinders greatly.Suppose that promptly the total current that Direct Current Distribution Unit 12 needs is 6A, adopt 1 rectification module output 6A of present embodiment to move, yet the rectification module of 2 parallel connections is respectively exported 3A and just can not be started.Reason is when a plurality of rectification modules are worked; Under the very low situation of line voltage; Each rectification module all is in the very low interval of conversion efficiency; And the words that 1 rectification module work is only arranged can have relative high conversion rate, and the same pairing ac input power of dc output power has difference under two kinds of situation, and this can start when just causing only having 1 rectification module work.
Therefore, at T2 constantly, only keep 11 operations of 1 rectification module, other rectification module 11 is closed, and can improve the conversion efficiency of the power supply system for communications 1; At T2 constantly, rectification module 11 begins output and keeps a period of time to raise again from the voltage of battery pack 14, guarantee T2～T3 the startup stage charging current does not appear, and then reach the purpose that reduces city's surge.Adopt above-mentioned means can improve rectification module 11 and start probability of successful.
(2) after rectification module successfully starts, need carry out Current limited Control to it, controlled with the power output that guarantees rectification module.Be set with the load protection current value in the parameter setting software module 16; It can be dynamic adjusted value that the maximum of rectification module 11 allows output current, and promptly the maximum of rectification module 11 allows output current=load protection current value * current voltage of battery pack rated voltage/battery pack.The method of Current limited Control is: among Fig. 2 T3 begin constantly to raise rectification module 11 output voltage, begin battery pack 14 charged after; Promptly the output current of rectification module 11 is monitored; And the maximum of dynamically adjusting rectification module 11 allows output current; The power output that guarantees rectification module 11 is controlled, can guarantee the stable of alternating current thus, improves the adaptive capacity of 1 pair of abominable single phase alternating current (A.C.) environment of the power supply system for communications.
Treat that battery pack 14 begins after the charging, 15 pairs of single-phase civil powers of monitoring unit are monitored, and when the environment that monitors civil power is more satisfactory, can starts other rectification module 11 when promptly higher, the equivalent resistance of line voltage is low gradually and get into operating state.
(3) in the power supply system for communications running, when monitoring unit monitors rectification module 11 when occurring starting phenomenon repeatedly, the output voltage that reduces rectification module 11 is the voltage of battery pack 14, and the output current of rectification module 11 is carried out current limliting.Make this power supply system for communications 1 have automatic recovery ability thus for interference.
The reason that rectification module 11 starts repeatedly possibly be significantly vibration after civil power is interfered, and also possibly be that civil power is frequently jumped electricity, and rectification module 11 gets into starting state repeatedly thus, for example when continuous 3 startups of rectification module 11, just judges that it is for start repeatedly.At this moment, the voltage drop of rectification module 11 is low to moderate the voltage of battery pack 14, the alternating current in the time of can reducing rectification module 11 and restart, the interchange impulse current when reducing rectification module and starting improves rectification module and restarts probability of successful.
Reduce after the output voltage of rectification module 11; When treating that rectification module 11 starts once more, can keep the output voltage of rectification module 11 not change in a period of time, improve output voltage afterwards more gradually; And rectification module is carried out current limliting regulate, make power output keep constant.
Below, verify the beneficial effect of this control method with one group of concrete experimental data.
The reason of single-phase city electrical anomaly generally has 2 kinds, and the one, the long and line in alternating current circuit footpath is not enough, causes on the line loss excessive; The 2nd, the front end transformer capacity is not enough.According to customer response, on several kilometers long 220V single phase alternating current (A.C.) circuit, insert when overlapping the power supply system for communications more, the situation of unit exception can appear, and the method for therefore taking on 220V single-phase ac power supply circuit, to seal in resistance is come simulated experiment.
Experiment equipment: the rectification module that uses two parallel connections; Join nominal capacity 65Ah battery pack, the battery pack floating voltage is 48.36V (rated voltage is 53.5V); The load of communication equipment is 3A; Rectification module order cross streams civil power.
Method of contrast one: regulating the ac line resistance is 12 ohm, starts two rectification modules simultaneously when starting the single phase alternating current (A.C.) civil power, and just battery pack is charged when starting two rectification modules.
Experimental result: the rectification module repeated oscillation can't start.Reason is: because alternating current is unstable, add that rectification module just charges the battery when starting, direct current power is very big, and corresponding interchange input current is big, because line loss is big, causes alternating voltage to drop rapidly.Rectification module is because input voltage is crossed the low guard mode that gets into, and constantly vibration can't start all the time later on.
Experimental technique one: regulating the ac line resistance is 20 ohm, only starts a rectification module when starting the single phase alternating current (A.C.) civil power, another is in holding state; The load protection current value of getting single rectification module is the 0.1C of battery pack nominal capacity
10(be the battery pack nominal capacity divided by 10 hours 1 times, 6.5A); Voltage was 48.36V when rectification module started, and kept the rectification module voltage that raise gradually more afterwards in 40 seconds, when rising rectification module voltage, rectification module was carried out current limliting, permanent power adjustments.
Experimental result: when rectification module had just started, output current remained on 3A; After the power supply system for communications operation 100 seconds, the output current of output module about 6.8A, output voltage 49.45V, the about 336W of dc output power, AC-input voltage are 169.9V, input current is 2.53A.
Method of contrast two: disturb the single phase alternating current (A.C.) civil power after two equal working stabilities of rectification module of the power supply system for communications, sudden power is also connected.Output voltage before rectification module still keeps cutting off the power supply.
Experimental result: rectification module begins output earlier, and then because the falling of alternating voltage, rectification module gets into protection; Then rectification module begins output again, the falling of alternating voltage, and rectification module gets into protection; Rectification module starts 7 times repeatedly still can't get into operate as normal.
Experimental technique two: on the basis of method of contrast two, make the output voltage of rectification module be reduced to current cell voltage.
Experimental result: rectification module starts successfully, gets into normal operating conditions.
Method of contrast three: on the basis of experimental technique two, do not adopt Current limited Control.
Experimental result: along with batteries charging voltage raises gradually, the alternating current rheology is big, and alternating voltage descends suddenly afterwards, and rectification module can't work on.
Experimental technique three: on the basis of experimental technique two, adopt Current limited Control, the load protection current value of getting two rectification modules is the 0.15C of battery pack nominal capacity
10(be battery pack nominal capacity divided by 10 hours, multiply by 1.5 times again, the result is 9.75A), and the maximum of two rectification modules allows output current=load protection current value * current voltage of 53.5V/ battery pack.
Experimental result: when direct voltage was 46V, the module cut-off current was 11.3A, the about 510W of maximum dc output power; When direct voltage was 53.5V, the module cut-off current was 9.7A, and the about 508W of maximum dc output power exchanges the input current basically identical under two kinds of situation, and system can steady in a long-term move.
For above-mentioned experiment equipment, adopted after the control method of present embodiment proposition, even further increase the equivalent resistance of single phase alternating current (A.C.) electrical network, the power supply system for communications still can be worked.For example, when the circuit equivalent resistance was 33 ohm, rectification module can be exported the direct current power of 195W.When cooperating high efficiency rate rectification module (the existing relatively common rectification module of this new-type rectification module has higher conversion efficiency), can accomplish that when the circuit equivalent resistance was 38 ohm, rectification module can be exported the direct current power of 200W.
Though the present invention with preferred embodiment openly as above; But it is not to be used for limiting claim; Any those skilled in the art are not breaking away from the spirit and scope of the present invention; Can make possible change and modification, so protection scope of the present invention should be as the criterion with the scope that claim of the present invention was defined.
Claims (6)
1. control method that improves adaptability of communication power supply to single-phase alternating-current power grid; Be used to have Direct Current Distribution Unit, the power supply system for communications of battery pack, monitoring unit, a plurality of rectification module parallel with one another; The input of each rectification module is connected to the single phase alternating current (A.C.) electrical network, output is connected to Direct Current Distribution Unit; Direct Current Distribution Unit is connected with described battery pack and communication equipment; It is characterized in that said control method comprises: when the power supply system for communications starts, under the control of said monitoring unit, keep said rectification module operation, other rectification module to get into holding state; The output voltage of rectification module begins output from battery voltage, keeps a period of time, raises gradually again.
2. control method as claimed in claim 1 is characterized in that: when the output voltage of rectification module begins to raise, rectification module is carried out Current limited Control.
3. control method as claimed in claim 2; It is characterized in that: said monitoring unit has the parameter setting software module that is used to set the load protection current value; Said monitoring unit carries out Current limited Control according to the load protection current value to rectification module; Said load protection current value is related with the nominal capacity of battery pack, and greater than the required electric current of said communication equipment actual motion, current single phase alternating current (A.C.) electrical network can be supported the pairing power of this load protection current value simultaneously.
4. control method as claimed in claim 3 is characterized in that: said load protection current value is the 0.05C of battery pack nominal capacity
10～0.50C
10Between.
5. control method as claimed in claim 3 is characterized in that: when rectification module was carried out Current limited Control, the maximum of rectification module allowed output current=load protection current value * current voltage of battery pack rated voltage/battery pack.
6. control method as claimed in claim 1; It is characterized in that: said control method also comprises: in the power supply system for communications running; When each rectification module occurs starting phenomenon repeatedly; The output voltage that reduces each rectification module is the voltage of battery pack, and each rectification module is carried out Current limited Control.
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| CN102217165A (en) * | 2011-05-11 | 2011-10-12 | 华为技术有限公司 | Communication power supply and control method thereof |
| CN102255522B (en) * | 2011-07-25 | 2013-07-31 | 中达电通股份有限公司 | DC (direct current) power supply system control method adapted to deficient output power of three-phase AC (alternating current) power grid |
| CN102709985B (en) * | 2012-06-18 | 2014-11-26 | 深圳市健网科技有限公司 | Modularized storage battery charging management system and charging management method |
| CN112636365A (en) * | 2020-11-11 | 2021-04-09 | 九江赛晶科技股份有限公司 | Method for controlling power constancy of high-power rectifying device |
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| US6577106B2 (en) * | 2000-11-30 | 2003-06-10 | Honeywell International Inc. | Multi-functional AC/DC converter |
| US7557464B2 (en) * | 2006-05-23 | 2009-07-07 | Continental Automotive Systems Us, Inc. | System and method for isolating sources and loads of a power system |
| EP2294687B1 (en) * | 2008-06-27 | 2016-08-24 | ABB Research Ltd. | Battery energy source arrangement and voltage source converter system |
| CN101436823B (en) * | 2008-12-19 | 2011-11-30 | 中兴通讯股份有限公司 | Control method and control equipment capable of improving communication power supply AC electric network adaptability |
| CN101630918B (en) * | 2009-05-12 | 2012-09-05 | 中兴通讯股份有限公司 | Energy-saving modular high-voltage direct current (DC) power system |
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