CN108886267A - Circuit control method, device, far end supply and system in remote feeding power system - Google Patents

Circuit control method, device, far end supply and system in remote feeding power system Download PDF

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Publication number
CN108886267A
CN108886267A CN201680084492.4A CN201680084492A CN108886267A CN 108886267 A CN108886267 A CN 108886267A CN 201680084492 A CN201680084492 A CN 201680084492A CN 108886267 A CN108886267 A CN 108886267A
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far end
end supply
input
supply
current
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CN108886267B (en
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樊孝斌
张炳宇
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Huawei Technologies Co Ltd
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Huawei Technologies 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

Abstract

Circuit control method, device, far end supply and system in a kind of remote feeding power system, are related to field of circuit technology, can make system steady operation near route maximum power point by limiting the maximum value of line current, improve the working efficiency of system.Control method includes：According to the size relation between identified reference threshold and the actual parameter of acquired current time far end supply, it is determined whether reduce the output power of far end supply, and when determining the output power for reducing far end supply, reduce the output power of far end supply.Wherein, the parameter of reference threshold is the input power of far end supply when being maximum value far end supply, parameter is input current value, input voltage value or the input equivalent impedance of far end supply, and the input power of far end supply is the difference of the loss of the output power and transmission line of local supply.

Description

Circuit control method, device, far end supply and system in remote feeding power system Technical field
The present invention relates to circuit control method, device, far end supply and the systems in field of circuit technology more particularly to a kind of remote feeding power system.
Background technique
With the development of circuit engineering, it is powered to realize to distal end load, it can be using minimum remote feeding power system.As shown in Figure 1,48VDC or 220VAC are raised to 380VDC high pressure by local supply, using communication twisted pair line, by 380V high-voltage transmission to far end supply, 380VDC high pressure is transformed into 48VDC by far end supply later, and gives the distal end load supplying of such as load equipment.
As distal end load impedance R_load is gradually decreased from infinity, far end supply output voltage V_re_out decline.Due to negative voltage feedback control action, far end supply controller is to stabilize the output voltage, it will increase power inverter conducting dutycycle or turn-on time at this time, far end supply input current I_re_in and line current I_line is caused to increase, pressure drop on route increases, far end supply input voltage V_re_in is reduced, and distal end input terminal equivalent impedance R_re_in is also accordingly reduced.Far end supply input voltage V_re_in reduces the reduction that will lead to far end supply output voltage V_re_out again, belong to positive feedback process, before in distal end, input power P_re_in reaches maximum value, the increase of far end supply output power, distal end input power also increases accordingly, negative feedback is greater than positive feedback effect, and minimum remote feeding power system is mainly shown as that negative feedback control works.When load impedance R_load continues to decline, when R_re_in being caused to drop to certain ohm, there is maximum value in distal end input power P_re_in, at this time and the limit maximum power of line transmission.When distal end, load impedance R_load continues to reduce; when route is in overload; the decline of far end supply input voltage will lead to distal end output voltage and accelerate decline; far end supply is set to be in opened loop control state; converter conducting dutycycle or turn-on time reach maximum value, and far end supply is caused the current-limiting protection of under-voltage protection restarting or triggering local supply occur.
It also means that, when load equipment is in the working condition of high voltage-small current, although It can also continue to increase load, but when load increases to maximum power allowed beyond route, when being at the working condition of low-voltage, high-current, the line loss of minimum remote feeding power system is larger, if further increasing load, line loss can be then further increased, distal end output power is greatly lowered, to reduce the working efficiency of minimum remote feeding power system.
Summary of the invention
The embodiment of the present invention provides circuit control method, device, far end supply and the system in a kind of remote feeding power system, can system steady operation near route maximum power point, improve the working efficiency of system.
In order to achieve the above objectives, the embodiment of the present invention adopts the following technical scheme that
First aspect, the embodiment of the present invention provides the circuit control method in a kind of remote feeding power system, it include local supply and far end supply in the remote feeding power system, the output end of the local supply is connect with the input terminal of the far end supply by transmission line, the described method includes: determining reference threshold, the parameter of the reference threshold is the input power of the far end supply when the being maximum value far end supply, the parameter is the input current value of the far end supply, input voltage value or input equivalent impedance, the input power of the far end supply is the difference of the loss of the output power and the transmission line of the local supply；Obtain the actual parameter of far end supply described in current time；According to the size relation between the actual parameter of far end supply described in the current time and the reference threshold, it is determined whether reduce the output power of the far end supply；When determining the output power for reducing the far end supply, reduce the output power of the far end supply.
According to the relationship between actual parameter and reference threshold, to determine the need for reducing the output power of far end supply, later by adjusting the output power of far end supply, achieve the effect that the maximum value for limiting line current.Therefore, system steady operation near route maximum power point can be made, and improve the working efficiency of system.
With reference to first aspect, in a first possible implementation of that first aspect, the determining reference threshold, comprising: the input voltage and input current of far end supply described in the input voltage of far end supply described in the first moment of acquisition and input current and the second moment；According to the input voltage and input current of far end supply described in the input voltage of far end supply described in first moment and input current and second moment, the reference threshold is determined.
By determine this current system the first two different moments far end supply input voltage and input current, it is capable of determining that the corresponding reference threshold of this current system, therefore, it can be in the case where guaranteeing that identified reference threshold can be suitable for current system architecture, make system steady operation near route maximum power point, and improves the working efficiency of system.
The first possible implementation with reference to first aspect, in a second possible implementation of that first aspect, the input voltage and input current of the far end supply according to first moment, and the input voltage and input current of far end supply described in second moment, determine the reference threshold, include: when the parameter be the far end supply input voltage, and the input power of the far end supply be maximum value when, the input voltage of the far end supplyWherein, I_line_1 is the input current of far end supply described in first moment, I_line_2 is the input current of far end supply described in second moment, V_re_in_1 is the input voltage of far end supply described in first moment, and V_re_in_2 is the input voltage of far end supply described in second moment；Alternatively, when the parameter be the far end supply input current, and the input power of the far end supply be maximum value when, the input current of the far end supplyAlternatively, when the parameter be the far end supply input equivalent impedance, and the input power of the far end supply be maximum value when, the input terminal equivalent impedance of the far end supply
During determining reference threshold, in view of in current system in the case where route does not change, in conjunction with the input current and input voltage of the far end supply of different moments, by calculating accurate determine when the input power of far end supply is maximum value, input current, input voltage and the input terminal equivalent impedance of far end supply, and above-mentioned parameter is determined as reference threshold, overload is in avoid route.
With reference to first aspect, or any possible implementation in first and second kinds of possible implementations of first aspect, in first aspect in the third possible implementation, size relation between the parameter and the reference threshold of the far end supply according to the current time, determine whether to reduce the output power of the far end supply, comprising: the input electricity of the reference threshold is the input power of the far end supply when the being maximum value far end supply Pressure reduces the output power of the far end supply when the input power that the input voltage for determining the far end supply described in the current time is less than the far end supply is maximum value when the input voltage of the far end supply；Or, the input current of the reference threshold is the input power of the far end supply when the being maximum value far end supply, when the input power that the input current for determining the far end supply described in the current time is greater than the far end supply is maximum value when the input current of the far end supply, reduce the output power of the far end supply；Or, the input terminal equivalent impedance of the reference threshold is the input power of the far end supply when the being maximum value far end supply, when the input power that the input terminal equivalent impedance for determining the far end supply described in the current time is less than the far end supply is maximum value when the input terminal equivalent impedance of the far end supply, reduce the output power of the far end supply, wherein, the input terminal equivalent impedance of far end supply described in the current time is the ratio of the input voltage and the input current of far end supply described in the current time of far end supply described in the current time.
Due in the case where same system route is constant, exist between the input voltage of far end supply, input current and input equivalent impedance and is associated with, therefore, it can differentiate using any one above-mentioned parameter as actual parameter, namely the corresponding reference threshold of determining actual parameter is compared, and the conclusion for whether needing to reduce the output power of far end supply obtained.It can be seen that determining the need for reducing the method for the output power of far end supply including at least any one in above-mentioned three kinds.
With reference to first aspect, or any possible implementation of the first aspect first into the third possible implementation, in the 4th kind of possible implementation of first aspect, the actual parameter of the far end supply includes the input voltage of the far end supply, described when determining the output power for reducing the far end supply, before the output power for reducing the far end supply, it include: the actual parameter for obtaining local supply described in the current time, the actual parameter of the local supply includes the output voltage of the local supply；According to the size relation between the actual parameter of local supply described in the actual parameter of far end supply described in the current time and the current time, it is determined whether reduce the output power of the far end supply.
According to the relationship between the input voltage of current time far end supply and the output voltage of local supply, to determine the need for reducing the output power of far end supply, later by adjusting the output power of far end supply, achieve the effect that the maximum value for limiting line current.Therefore, It can make system steady operation near route maximum power point, and improve the working efficiency of system.
Second aspect, the embodiment of the present invention provides the circuit control device in a kind of remote feeding power system, it include local supply and far end supply in the remote feeding power system, the output end of the local supply is connect with the input terminal of the far end supply by transmission line, described device comprises determining that module, for determining reference threshold, the parameter of the reference threshold is the input power of the far end supply when the being maximum value far end supply, the parameter is the input current value of the far end supply, input voltage value or input equivalent impedance, the input power of the far end supply is the difference of the loss of the output power and the transmission line of the local supply；Module is obtained, for obtaining the actual parameter of far end supply described in current time；The determining module, the size relation being also used between the actual parameter and the reference threshold of the far end supply according to the current time of the acquisition module acquisition, it is determined whether reduce the output power of the far end supply；Module is adjusted, for reducing the output power of the far end supply when the determining module determines the output power for reducing the far end supply.
In conjunction with second aspect, in second aspect in the first possible implementation, the determining module, specifically for obtain the first moment described in far end supply input voltage and input current and the second moment described in far end supply input voltage and input current；According to the input voltage and input current of far end supply described in the input voltage of far end supply described in first moment and input current and second moment, the reference threshold is determined.
The first possible implementation in conjunction with second aspect, in second of second aspect possible implementation, the determining module, specifically for when the input voltage that the parameter is the far end supply, and the input power of the far end supply be maximum value when, the input voltage of the far end supplyWherein, I_line_1 is the input current of far end supply described in first moment, I_line_2 is the input current of far end supply described in second moment, V_re_in_1 is the input voltage of far end supply described in first moment, and V_re_in_2 is the input voltage of far end supply described in second moment；Alternatively, when the parameter be the far end supply input current, and the input power of the far end supply be maximum value when, the input current of the far end supplyAlternatively, working as the ginseng Number be the far end supply input equivalent impedances, and the input power of the far end supply be maximum value when, the input terminal equivalent impedance of the far end supply
In conjunction with second aspect, or any possible implementation in first and second kinds of possible implementations of second aspect, in second aspect in the third possible implementation, the determining module, the input voltage of far end supply when specifically for the input power that the reference threshold is the far end supply being maximum value, when the input power that the input voltage for determining the far end supply described in the current time is less than the far end supply is maximum value when the input voltage of the far end supply, reduce the output power of the far end supply；Or, the input current of the reference threshold is the input power of the far end supply when the being maximum value far end supply, when the input power that the input current for determining the far end supply described in the current time is greater than the far end supply is maximum value when the input current of the far end supply, reduce the output power of the far end supply；Or, the input terminal equivalent impedance of the reference threshold is the input power of the far end supply when the being maximum value far end supply, when the input power that the input terminal equivalent impedance for determining the far end supply described in the current time is less than the far end supply is maximum value when the input terminal equivalent impedance of the far end supply, reduce the output power of the far end supply, wherein, the input terminal equivalent impedance of far end supply described in the current time is the ratio of the input voltage and the input current of far end supply described in the current time of far end supply described in the current time.
In conjunction with second aspect, or any possible implementation of the second aspect first into the third possible implementation, in the 4th kind of possible implementation of second aspect, the actual parameter of the far end supply includes the input voltage of the far end supply, the acquisition module, it is also used to obtain the actual parameter of local supply described in the current time, the actual parameter of the local supply includes the output voltage of the local supply；The determining module, size relation between the actual parameter of local supply described in the actual parameter of far end supply described in the current time for being also used to be obtained according to the acquisition module and the current time, it is determined whether reduce the output power of the far end supply.
The third aspect, the embodiment of the present invention provide a kind of far end supply, and the far end supply is used for a kind of remote feeding power system, include local supply in the remote feeding power system and described remote Power supply is held, the output end of the local supply is connect with the input terminal of the far end supply by transmission line, and the far end supply includes processor, interface circuit and bus, and the bus is for realizing the connection communication between the processor and the interface circuit；The interface circuit, for determining reference threshold, the parameter of the reference threshold is the input power of the far end supply when the being maximum value far end supply, the parameter is input current value, input voltage value or the input equivalent impedance of the far end supply, and the input power of the far end supply is the difference of the loss of the output power and the transmission line of the local supply；The interface circuit is also used to obtain the actual parameter of far end supply described in current time；The processor, for the size relation between the actual parameter and the reference threshold of the far end supply according to the current time obtained by the interface circuit, it is determined whether reduce the output power of the far end supply；The processor is also used to reduce the output power of the far end supply when determining the output power for reducing the far end supply.
In conjunction with the third aspect, in the third aspect in the first possible implementation, the interface circuit, specifically for obtain the first moment described in far end supply input voltage and input current and the second moment described in far end supply input voltage and input current；According to the input voltage and input current of far end supply described in the input voltage of far end supply described in first moment and input current and second moment, the reference threshold is determined.
The first possible implementation in conjunction with the third aspect, in second of the third aspect possible implementation, the interface circuit, specifically for when the input voltage that the parameter is the far end supply, and the input power of the far end supply be maximum value when, the input voltage of the far end supplyWherein, I_line_1 is the input current of far end supply described in first moment, I_line_2 is the input current of far end supply described in second moment, V_re_in_1 is the input voltage of far end supply described in first moment, and V_re_in_2 is the input voltage of far end supply described in second moment；Alternatively, when the parameter be the far end supply input current, and the input power of the far end supply be maximum value when, the input current of the far end supplyAlternatively, when the parameter be the far end supply input equivalent impedance, and the input power of the far end supply be maximum value when, the input terminal equivalent impedance of the far end supply
In conjunction with the third aspect, or any possible implementation in first and second kinds of possible implementations of the third aspect, in the third aspect in the third possible implementation, the input voltage of the reference threshold is the input power of the far end supply when the being maximum value far end supply, the processor, input power specifically for being less than the far end supply when the input voltage for determining the far end supply described in the current time when input voltage of the far end supply, reduces the output power of the far end supply when being maximum value；Or, the input current of the reference threshold is the input power of the far end supply when the being maximum value far end supply, when the input power that the input current for determining the far end supply described in the current time is greater than the far end supply is maximum value when the input current of the far end supply, reduce the output power of the far end supply；Or, the input terminal equivalent impedance of the reference threshold is the input power of the far end supply when the being maximum value far end supply, when the input power that the input terminal equivalent impedance for determining the far end supply described in the current time is less than the far end supply is maximum value when the input terminal equivalent impedance of the far end supply, reduce the output power of the far end supply, wherein, the input terminal equivalent impedance of far end supply described in the current time is the ratio of the input voltage and the input current of far end supply described in the current time of far end supply described in the current time.
In conjunction with the third aspect, or any possible implementation of the third aspect first into the third possible implementation, in the 4th kind of possible implementation of the third aspect, the actual parameter of the far end supply includes the input voltage of the far end supply, the interface circuit, it is also used to obtain the actual parameter of local supply described in the current time, the actual parameter of the local supply includes the output voltage of the local supply；The processor, be also used to the far end supply according to the current time obtained by the interface circuit actual parameter and the current time described in local supply actual parameter between size relation, it is determined whether reduce the output power of the far end supply.
Fourth aspect, the embodiment of the present invention provides a kind of remote feeding power system, it include local supply and far end supply in the remote feeding power system, the output end of the local supply is connect with the input terminal of the far end supply by transmission line, and the far end supply is any far end supply in the third aspect.
Circuit control method, device, far end supply and system in a kind of remote feeding power system provided in an embodiment of the present invention, according to the actual parameter of acquired current time far end supply, and identified reference threshold, determine whether the output power of reduction far end supply, later when determining the output power for reducing far end supply, reduce the output power of far end supply.It is compared in the prior art when system works near route maximum power point, often due to increasing load and load equipment being caused to be changed to the working condition in low-voltage, high-current from the working condition in high voltage-small current, or the load equipment for being in low-voltage, high-current working condition is made to be in the working condition of more low-voltage more high current, the present invention can be according to the relationship between actual parameter and reference threshold, to determine the need for reducing the output power of far end supply, later by adjusting the output power of far end supply, achieve the effect that the maximum value for limiting line current.Therefore, system steady operation near route maximum power point can be made, and improve the working efficiency of system.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, the drawings to be used in the embodiments are briefly described below, apparently, drawings in the following description are only some embodiments of the invention, for those of ordinary skill in the art, without creative efforts, other attached drawings be can also be obtained according to these attached drawings.
Fig. 1 is a kind of structural schematic diagram of minimum remote feeding power system provided in an embodiment of the present invention；
Fig. 2 is the circuit control method flow chart in a kind of remote feeding power system provided in an embodiment of the present invention；
Fig. 3 is the circuit control method flow chart in another remote feeding power system provided in an embodiment of the present invention；
Fig. 4 is the circuit control method flow chart in another remote feeding power system provided in an embodiment of the present invention；
Fig. 5 is the circuit control method flow chart in another remote feeding power system provided in an embodiment of the present invention；
Fig. 6 is that the structure of another minimum remote feeding power system provided in an embodiment of the present invention is shown It is intended to；
Fig. 7 is the circuit control method flow chart in another remote feeding power system provided in an embodiment of the present invention；
Fig. 8 is the structural schematic diagram of the circuit control device in a kind of remote feeding power system provided in an embodiment of the present invention；
Fig. 9 is a kind of structural schematic diagram of far end supply provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, all other embodiment obtained by those of ordinary skill in the art without making creative efforts, shall fall within the protection scope of the present invention.
The embodiment of the present invention can be used for a kind of remote feeding power system, include local supply and far end supply in remote feeding power system, and the output end of local supply and the input terminal of far end supply are connected by transmission line.It should be noted that the internal structure of far end supply and local supply can be configured according to different demands, specifically can be implemented as Fig. 1 or as scheme it is several shown in structural schematic diagram, but be not limited only to the structure of above-mentioned signal.
The embodiment of the present invention provides the circuit control method in a kind of remote feeding power system, and the remote feeding power system that this method is applicable in can be minimum remote feeding power system as shown in Figure 1.It wherein, include local supply 100 and far end supply 200 in minimum remote feeding power system, the output end of local supply 100 can be attached with the input terminal of far end supply 200 by transmission line.It may include converter 21, controller 22, current detection circuit 23 and voltage detecting circuit 24 in far end supply 200.Wherein, controller 22 is used to control the working condition of converter 21.In embodiments of the present invention, the direct current or alternating current that local supply 100 can be used for input obtain the high voltage direct current for being suitble to line transmission by transformation, and are transmitted to far end supply 200 by transmission line；Far end supply 200 can be used for completing the transformation of high voltage direct current to low-voltage DC, that is, the high voltage direct current on transmission line is reduced to the low-voltage DC applied in equipment work for being suitble to connect with far end supply output end；Current detection circuit 23 can be used for detecting and acquiring the input current of far end supply 200；Voltage Detection circuit 24 can be used for detecting and acquiring the input voltage of far end supply 200, and current detection circuit 23 and voltage detecting circuit 24 can will test later or collection result feeds back to controller 22.As shown in Fig. 2, this method can be executed by local supply or far end supply, or executed by third party device, this method process includes:
101, reference threshold is determined.
Wherein, the parameter of reference threshold is the input power of far end supply when being maximum value far end supply, parameter is input current value, input voltage value or the input equivalent impedance of far end supply, and the input power of far end supply is the difference of the loss of the output power and transmission line of local supply.
Reference threshold is pre-set threshold value, in embodiments of the present invention, can be by comparing the size relation between the actual parameter and reference threshold of current time far end supply acquired in step 102, to determine the need for reducing the output power of far end supply.It should be noted that, in order to guarantee that system can reach preferably transmission state, in view of when the input power of far end supply is maximum value, i.e. when transmission line maximum power transfer, namely when system is when route maximum power point works, system is likely to the situation for occurring unstable, therefore, by setting reference threshold come at least one of the input voltage of far end supply, input current and input terminal equivalent impedance in limitation system, to achieve the purpose that limit line current.
102, the actual parameter of current time far end supply is obtained.
In embodiments of the present invention, the mode for obtaining actual parameter is not unique, such as: remote feeding power system can obtain actual parameter automatically, actual parameter can be obtained by current detection circuit or voltage detecting circuit, or the acquisition of actual parameter is carried out by way of apparatus measures in engineer, it later will be in the related memory cell of collected actual parameter deposit remote feeding power system.And when the subsequent setting for needing to carry out reference threshold, it is executed by local supply or far end supply, or reference threshold is determined according to actual parameter by third party device, and control the output power of far end supply, to achieve the purpose that the maximum current that restraining line road passes through, that is, limit maximum line current.It should be noted that the acquisition modes of actual parameter are not limited only to above-mentioned implementation, it is not limited here.
It should be noted that actual parameter may include a plurality of types of parameters, and such as: actual parameter may include line parameter circuit value, i.e., line impedance, material, line footpath length etc. being capable of shadows Ring the parameter for arriving line transmission efficiency, actual parameter can also include local supply output and input parameter and/or far end supply output and input parameter.Wherein, input parameter may include input voltage, input current, input impedance etc., and output parameter may include output voltage, output electric current, output impedance, output power etc..In embodiments of the present invention, for specific actual parameter without limiting, staff to determine required actual parameter and can carry out the acquisition of real data in conjunction with the feature of remote feeding power system according to specific application scenarios.
103, according to the size relation between the actual parameter and reference threshold of current time far end supply, it is determined whether reduce the output power of far end supply.
104, when determining the output power for reducing far end supply, reduce the output power of far end supply.
It should be noted that, by the process for the output power for reducing far end supply that above-mentioned steps 101 to step 104 are realized, it can adhere to that adjustment amplitude is low, adjust mode often, as far as possible by the stable output power of far end supply in a more suitable operation interval.It can not only guarantee that system is in metastable working condition in this way, and because adjustment amplitude each time is smaller, will not influence the overall performance of system.It also means that, above-mentioned adjustment process can execute repeatedly, until determining the output power for not needing to reduce far end supply.
Since the working condition of system is real-time change, in order to guarantee that system is constantly in the state of steady operation, the actual parameter of current time far end supply can be obtained in real time, and determines the need for reducing the output power of far end supply in conjunction with reference threshold.Simultaneously, in order to reduce the influence of the working condition current to system as far as possible, the output power for reducing far end supply can take multiple adjustment, and each lesser mode of adjustment amplitude, therefore, during reducing the output power of far end supply, when the actual parameter of current time far end supply reaches the state for needing not continue to reduce the output power of far end supply, namely ensure system can the steady operation near route maximum power point in the case where, the adjustment process to the output power of far end supply could be terminated.Also, ought after testing, when judging the output power for needing to continue to reduce far end supply, the operation of the output power of triggering adjustment far end supply again.
It should be noted that, above method process can be executed according to the period pre-set, or above method process is triggered again when needing and carrying out stability control to system, in embodiments of the present invention, the opportunity executed for triggering above method process is not limited only to above two possibility, it is not limited here.
Circuit control method in a kind of remote feeding power system provided in an embodiment of the present invention, according to the actual parameter of acquired current time far end supply, and identified reference threshold, determine whether the output power of reduction far end supply, later when determining the output power for reducing far end supply, reduce the output power of far end supply.It is compared in the prior art when system works near route maximum power point, often due to increasing load and load equipment being caused to be changed to the working condition in low-voltage, high-current from the working condition in high voltage-small current, or the load equipment for being in low-voltage, high-current working condition is made to be in the working condition of more low-voltage more high current, the present invention can be according to the relationship between actual parameter and reference threshold, to determine the need for reducing the output power of far end supply, later by adjusting the output power of far end supply, achieve the effect that the maximum value for limiting line current.Therefore, system steady operation near route maximum power point can be made, and improve the working efficiency of system.
In addition, in the prior art, in order to enable far end supply to export biggish power, to improve the working efficiency of system, generally requiring that multiple minimum remote feeding power systems are arranged, realizing the promotion of transimission power by way of by its parallel connection access later.And remote feeding power system provided by the embodiment of the present invention is used, in the case where providing identical distal end output power, line layout quantity can be reduced, reduces line layout cost.
In order to accurately determine the reference threshold for being adapted to current application scene, in an implementation of the embodiment of the present invention, the input voltage and input current that the far end supply at two moment can first be obtained respectively, determine reference threshold in conjunction with acquired parameter later.Therefore, on the basis of implementation as shown in Figure 2, it is also implemented as implementation as shown in Figure 3.Wherein, step 101 determines reference threshold, can be implemented as step 1011 and step 1012:
1011, the input voltage of the first moment far end supply and the input voltage and input current of input current and the second moment far end supply are obtained.
In view of the actual conditions of each system are different, in order to guarantee determining reference threshold energy Enough currently this systems that is suitable for can determine reference threshold by obtaining input voltage and the input current of the far end supply at the first moment and the second moment respectively in embodiments of the present invention.It should be noted that, at the time of first moment and the second moment are two differences, since the input voltage and input current of far end supply are also the variation with the time and change, the input voltage and input current of the far end supply of acquired different moments are all different.
1012, according to the input voltage of the first moment far end supply and input current and the input voltage and input current of the second moment far end supply, reference threshold is determined.
Circuit control method in a kind of remote feeding power system provided in an embodiment of the present invention, according to the actual parameter of acquired current time far end supply, and identified reference threshold, determine whether the output power of reduction far end supply, later when determining the output power for reducing far end supply, reduce the output power of far end supply.Wherein, reference threshold can be determined according to the input voltage and input current of the input voltage of the first acquired moment far end supply and input current and the second moment far end supply.It is compared in the prior art when system works near route maximum power point, often due to increasing load and load equipment being caused to be changed to the working condition in low-voltage, high-current from the working condition in high voltage-small current, or the load equipment for being in low-voltage, high-current working condition is made to be in the working condition of more low-voltage more high current, the present invention can be according to the relationship between actual parameter and reference threshold, to determine the need for reducing the output power of far end supply, later by adjusting the output power of far end supply, achieve the effect that the maximum value for limiting line current.And, by determine this current system the first two different moments far end supply input voltage and input current, it is capable of determining that the corresponding reference threshold of this current system, therefore, it can be in the case where guaranteeing that identified reference threshold can be suitable for current system architecture, make system steady operation near route maximum power point, and improves the working efficiency of system.
In an implementation of the embodiment of the present invention, actual parameter is input voltage, input current or input terminal equivalent impedance.Since actual parameter is related to voltage, electric current and equivalent impedance, when determining reference threshold, reference threshold corresponding with above-mentioned actual parameter can also be respectively obtained.It also means that, in embodiments of the present invention, different types of reference threshold can be determined by calculating, any one reference threshold can be chosen according to different demands later as the reference value in differentiation relationship, determine whether to need to reduce distal end The output power of power supply.Therefore, on the basis of implementation as shown in Figure 3, it is also implemented as implementation as shown in Figure 4.Wherein, step 1012 determines reference threshold, any one that can be implemented as in step 10121 to step 10123 according to the input voltage and input current of the first moment far end supply and the input voltage and input current of the second moment far end supply:
10121, when parameter is the input voltage of far end supply, and the input power of far end supply is maximum value, the input voltage of far end supply
Wherein, I_line_1 is the input current of the first moment far end supply, and I_line_2 is the input current of the second moment far end supply, and V_re_in_1 is the input voltage of the first moment far end supply, and V_re_in_2 is the input voltage of the second moment far end supply.
10122, when parameter is the input current of far end supply, and the input power of far end supply is maximum value, the input current of far end supply
10123, when parameter is the input equivalent impedance of far end supply, and the input power of far end supply is maximum value, the input terminal equivalent impedance of far end supply
In embodiments of the present invention, line current can be expressed as I_line=(V_co_out-V_re_in)/R_line.Wherein, I_line is the line current of transmission line, and V_co_out is the output voltage of local supply, and V_re_in is the input voltage of far end supply, and R_line is the line impedance on transmission line.
The input power of far end supply can be expressed as P_re_in=V_re_in × I_line.Wherein, P_re_in is the input power of far end supply.
I_line=(V_co_out-V_re_in)/R_line is substituted into P_re_in=V_re_in × I_line, P_re_in=V_re_in × (V_co_out-V_re_in)/R_line is obtained, P_re_in=(V_co_out × V_re_in-V_re_in is obtained after collated2)/R_line.Available later, as V_re_in=1/2 × V_co_out=V_re_in_match, the input power P_re_in of far end supply is maximized, i.e. P_re_in_max=V_co_out2/(4×R_line).Wherein, P_re_in_max is the maximal input of far end supply.
When the input power of far end supply is maximum value, the input current of far end supply can be expressed as I_re_in=(1/2 × V_co_out)/R_line=I_re_in_match.Wherein, the input current of far end supply when I_re_in_match is transmission line maximum power transfer.
When the input power of far end supply is maximum value, the input equivalent impedance of far end supply is identical as the numerical value of line impedance, i.e. R_re_in=R_line.
It should be noted that when the input power of far end supply is maximum value, i.e., when the power that obtains from route of far end supply is maximum value, maximum power that route can transmit is determined by the output voltage of local supply and the size of line impedance.
In embodiments of the present invention, in conjunction with above-mentioned derivation process, when far end supply under different load conditions, the input voltage for detecting the first moment far end supply is V_re_in_1, input current is I_line_1, the input voltage of first moment far end supply is V_re_in_2, input current I_line_2.For the output voltage of determining route and local side power good, available I_line_1=(V_co_out-V_re_in_1)/R_line, I_line_2=(V_co_out-V_re_in_2)/R_line.
It is collated available Later, the expression formula and above-mentioned derivation process of the R_line and V_co_out that are obtained according to arrangement, available above-mentioned steps 10121 to calculation formula involved in step 10123, i.e., Later according to above-mentioned formula, the corresponding reference threshold of different actual parameters can be determined respectively.
It should be noted that the peak power output of remote feeding power system is changed with the variation of different routes, may insure that circuit overload will not be generated using above-mentioned implementation.Also, when circuit overload occurs, the input power of the far end supply of remote feeding power system is in stable state always, i.e. stationary value is that the maximum transmission power of route is equal, meanwhile the input voltage of far end supply is in stable state always, i.e. the stationary value output that is local supply The 1/2 of voltage is equal.
In addition, in order to guarantee that calculation formula provided by the embodiment of the present invention can be suitable for multiple and different application scenarios, the specific value of reference threshold can be adjusted by the input voltage of far end supply, input current, input equivalent impedance, such as: when actual parameter is the input voltage of far end supply, reference threshold can be set to some specific parameter in section [V_re_in_match* (1-20%), V_re_in_match* (1+20%)].It should be noted that specific value range can be set according to different needs.And, when determining the specific value of reference threshold, in addition to can be by the way of above-mentioned determination section, it can also be by the way of directly increasing or reducing certain numerical value directly in the calculated result of original formula, it should be noted that, the method of determination of reference threshold is not limited only to aforesaid way, can also be determined using other modes, it is not limited here.
Circuit control method in a kind of remote feeding power system provided in an embodiment of the present invention, during determining reference threshold, it can be according to the input voltage and input current of the first moment far end supply, and second moment far end supply input voltage and input current, accurately to determine when the input power of far end supply is maximum value, input current, input voltage and the input terminal equivalent impedance of far end supply, i.e., the corresponding reference threshold of different actual parameters.It is compared in the prior art when system works near route maximum power point, often due to increasing load and load equipment being caused to be changed to the working condition in low-voltage, high-current from the working condition in high voltage-small current, or the load equipment for being in low-voltage, high-current working condition is made to be in the working condition of more low-voltage more high current, the present invention can be according to the relationship between actual parameter and reference threshold, to determine the need for reducing the output power of far end supply, later by adjusting the output power of far end supply, achieve the effect that the maximum value for limiting line current.Therefore, system steady operation near route maximum power point can be made, and improve the working efficiency of system.And, during determining reference threshold, in view of in current system in the case where route does not change, in conjunction with the input current and input voltage of the far end supply of different moments, by calculating accurate determine when the input power of far end supply is maximum value, input current, input voltage and the input terminal equivalent impedance of far end supply, and above-mentioned parameter is determined as reference threshold, overload is in avoid route.
It, can be according to step 10121 to step in an implementation of the embodiment of the present invention Identified reference threshold in rapid 10123, come determine execute following step 1031 to which of step 1033 or which, so that it is guaranteed that set different reference thresholds can be adapted for the differentiation process of different parameters.Therefore, on the basis of implementation as shown in Figure 4, it is also implemented as implementation as shown in Figure 5.Wherein, step 103 is according to the size relation between the actual parameter and reference threshold of current time far end supply, it is determined whether reduces the output power of far end supply, one for being implemented as in step 1031 to step 1033:
1031, the input voltage of reference threshold is the input power of far end supply when being maximum value far end supply, when determining the input voltage of far end supply when the input power that the input voltage of current time far end supply is less than far end supply is maximum value, reduce the output power of far end supply.
1032, the input current of reference threshold is the input power of far end supply when being maximum value far end supply, when determining the input current of far end supply when the input power that the input current of current time far end supply is greater than far end supply is maximum value, reduce the output power of far end supply.
1033, the input terminal equivalent impedance of reference threshold is the input power of far end supply when being maximum value far end supply, when determining the input terminal equivalent impedance of far end supply when the input power that the input terminal equivalent impedance of current time far end supply is less than far end supply is maximum value, reduce the output power of far end supply.
Wherein, the input terminal equivalent impedance of current time far end supply is the ratio of the input voltage of current time far end supply and the input current of current time far end supply.
In view of during determining reference threshold, reference threshold may be above-mentioned steps 10121 at least one thresholding involved in step 10123, therefore, corresponding with each thresholding to have an actual parameter.It also means that, when actual parameter is the input voltage of far end supply, then the input voltage of far end supply when the input power that reference threshold can be determined as to far end supply is maximum value；When actual parameter is the input current of far end supply, then the input current of far end supply when the input power that reference threshold can be determined as to far end supply is maximum value；When actual parameter is the input equivalent impedance of far end supply, then far end supply when the input power that reference threshold can be determined as to far end supply is maximum value Input equivalent impedance.Therefore, in embodiments of the present invention, for the different available different actual parameters of reference threshold, as long as and acquired actual parameter meet above-mentioned steps 1031 to any one situation in step 1033, then it is assumed that need to reduce the output power of far end supply.
Circuit control method in a kind of remote feeding power system provided in an embodiment of the present invention, during determining the need for reducing the output power of far end supply, size relation between the input voltage of far end supply when can be according to the input voltage and transmission line maximum power transfer of current time far end supply, or size relation when according to the input power of the input current of current time far end supply and far end supply being maximum value between the input current of far end supply, or size relation when according to the input power of the input voltage and input current of current time far end supply and far end supply being maximum value between the input terminal equivalent impedance of far end supply, to determine the need for the output power of adjustment far end supply.It is compared in the prior art when system works near route maximum power point, often due to increasing load and load equipment being caused to be changed to the working condition in low-voltage, high-current from the working condition in high voltage-small current, or the load equipment for being in low-voltage, high-current working condition is made to be in the working condition of more low-voltage more high current, the present invention can be according to the relationship between actual parameter and reference threshold, to determine the need for reducing the output power of far end supply, later by adjusting the output power of far end supply, achieve the effect that the maximum value for limiting line current.Therefore, system steady operation near route maximum power point can be made, and improve the working efficiency of system.And, due in the case where same system route is constant, exist between the input voltage of far end supply, input current and input equivalent impedance and is associated with, therefore, it can differentiate using any one above-mentioned parameter as actual parameter, namely the corresponding reference threshold of determining actual parameter is compared, and the conclusion for whether needing to reduce the output power of far end supply obtained.It can be seen that determining the need for reducing the method for the output power of far end supply including at least any one in above-mentioned three kinds.
In an implementation of the embodiment of the present invention, the remote feeding power system that this method is applicable in can also be minimum remote feeding power system as shown in FIG. 6.It wherein, include local supply 300 and far end supply 400 in minimum remote feeding power system, the output end of local supply 300 can be attached with the input terminal of far end supply 400 by transmission line.Local supply It may include converter 31, control 32 and telecommunication circuit 33 in 300.It may include converter 41, controller 42, voltage detecting circuit 43 and telecommunication circuit 44 in far end supply 400.Wherein, the controller 32 of local supply 300 can be connected by telecommunication circuit 33 and telecommunication circuit 44 with the controller 42 of far end supply 400.In embodiments of the present invention, the direct current or alternating current that local supply 300 can be used for input obtain the high voltage direct current for being suitble to line transmission by transformation, and are transmitted to far end supply 400 by transmission line；Far end supply 400 can be used for completing the transformation of high voltage direct current to low-voltage DC, that is, the high voltage direct current on transmission line is reduced to the low-voltage DC applied in equipment work for being suitble to connect with far end supply output end；Voltage detecting circuit 43 can be used for detecting and acquiring the input voltage of far end supply 400, and voltage detecting circuit 43 can will test later or collection result feeds back to controller 42；The communication line being connect through telecommunication circuit 33 with telecommunication circuit 44 can be used for informing the output voltage of local supply 300 controller 42 of far end supply 400.
Therefore, on the basis of implementation as shown in Figure 2, it is also implemented as implementation as shown in Figure 7.Wherein, the actual parameter of far end supply may include the input voltage of far end supply, is executing step 104 when determining the output power for reducing far end supply, before the output power for reducing far end supply, can execute step 105 and step 106:
105, the actual parameter of current time local supply is obtained.
Wherein, the actual parameter of local supply includes the output voltage of local supply.
106, according to the size relation between the actual parameter of current time far end supply and the actual parameter of current time local supply, it is determined whether reduce the output power of far end supply.
When the input power of far end supply is maximum value, the input voltage of far end supply is the half of the output voltage of local supply, therefore, in embodiments of the present invention, it can be according to the size relation between the half of the output voltage of the input voltage and local supply of synchronization far end supply, come determine the need for reduce far end supply output power, and reduce far end supply output power during, can be until no longer needing to reduce the output power of far end supply.
Circuit control method in a kind of remote feeding power system provided in an embodiment of the present invention, when the input voltage of acquired current time far end supply is less than acquired current time local side When the half of the output voltage of power supply, the output power for reducing far end supply is determined, later when determining the output power for reducing far end supply, reduce the output power of far end supply.It is compared in the prior art when system works near route maximum power point, often due to increasing load and load equipment being caused to be changed to the working condition in low-voltage, high-current from the working condition in high voltage-small current, or the load equipment for being in low-voltage, high-current working condition is made to be in the working condition of more low-voltage more high current, the present invention can be according to the relationship between the input voltage of current time far end supply and the output voltage of local supply, to determine the need for reducing the output power of far end supply, later by adjusting the output power of far end supply, achieve the effect that the maximum value for limiting line current.Therefore, system steady operation near route maximum power point can be made, and improve the working efficiency of system.
The embodiment of the present invention provides the circuit control device 50 in a kind of remote feeding power system, device 50 is used for a kind of remote feeding power system, it include local supply and far end supply in remote feeding power system, the output end of local supply and the input terminal of far end supply are connected by transmission line.As shown in figure 8, the device 50 can be used for executing if Fig. 2 is to either as shown in Figure 5 method process, or for executing method flow as shown in Figure 7, which includes:
Determining module 51, for determining reference threshold, the parameter of reference threshold is the input power of far end supply when being maximum value far end supply, parameter is input current value, input voltage value or the input equivalent impedance of far end supply, and the input power of far end supply is the difference of the loss of the output power and transmission line of local supply.
Module 52 is obtained, for obtaining the actual parameter of current time far end supply.
Determining module 51 is also used to according to the size relation between the actual parameter and reference threshold for obtaining the current time far end supply that module 52 obtains, it is determined whether reduce the output power of far end supply.
Module 53 is adjusted, for reducing the output power of far end supply when determining module 51 determines the output power for reducing far end supply.
In an implementation of the embodiment of the present invention, determining module 51, specifically for obtaining the input voltage of the first moment far end supply and the input voltage and input current of input current and the second moment far end supply；
According to the input voltage of the first moment far end supply and input current and the second moment The input voltage and input current of far end supply, determine reference threshold.
In an implementation of the embodiment of the present invention, determining module 51, specifically for when parameter be far end supply input voltage, and the input power of far end supply be maximum value when, the input voltage of far end supplyWherein, I_line_1 is the input current of the first moment far end supply, and I_line_2 is the input current of the second moment far end supply, and V_re_in_1 is the input voltage of the first moment far end supply, and V_re_in_2 is the input voltage of the second moment far end supply；
Alternatively,
When parameter is the input current of far end supply, and the input power of far end supply is maximum value, the input current of far end supply
Alternatively,
When parameter is the input equivalent impedance of far end supply, and the input power of far end supply is maximum value, the input terminal equivalent impedance of far end supply
In an implementation of the embodiment of the present invention, determining module 51, the input voltage of far end supply when specifically for the input power that reference threshold is far end supply being maximum value, when determining the input voltage of far end supply when the input power that the input voltage of current time far end supply is less than far end supply is maximum value, reduce the output power of far end supply；
Alternatively,
The input current of reference threshold is the input power of far end supply when being maximum value far end supply, when determining the input current of far end supply when the input power that the input current of current time far end supply is greater than far end supply is maximum value, reduce the output power of far end supply；
Alternatively,
The input terminal equivalent impedance of reference threshold is the input power of far end supply when being maximum value far end supply, when determining the input terminal equivalent impedance of far end supply when the input power that the input terminal equivalent impedance of current time far end supply is less than far end supply is maximum value, reduce the output power of far end supply, wherein, the input terminal equivalent impedance of current time far end supply is the ratio of the input voltage of current time far end supply and the input current of current time far end supply.
In an implementation of the embodiment of the present invention, the actual parameter of far end supply includes the input voltage of far end supply, module 52 is obtained, is also used to obtain the actual parameter of current time local supply, the actual parameter of local supply includes the output voltage of local supply.
Determining module 51 is also used to according to the size relation obtained between the actual parameter of current time far end supply and the actual parameter of current time local supply that module 52 obtains, it is determined whether reduce the output power of far end supply.
Circuit control device in a kind of remote feeding power system provided in an embodiment of the present invention, according to the actual parameter of acquired current time far end supply, and identified reference threshold, determine whether the output power of reduction far end supply, later when determining the output power for reducing far end supply, reduce the output power of far end supply.It is compared in the prior art when system works near route maximum power point, often due to increasing load and load equipment being caused to be changed to the working condition in low-voltage, high-current from the working condition in high voltage-small current, or the load equipment for being in low-voltage, high-current working condition is made to be in the working condition of more low-voltage more high current, the present invention can be according to the relationship between actual parameter and reference threshold, to determine the need for reducing the output power of far end supply, later by adjusting the output power of far end supply, achieve the effect that the maximum value for limiting line current.Therefore, system steady operation near route maximum power point can be made, and improve the working efficiency of system.
The embodiment of the present invention provides a kind of far end supply 60, the far end supply 60 is used for a kind of remote feeding power system, it include local supply and far end supply in remote feeding power system, the output end of local supply and the input terminal of far end supply are connected by transmission line, far end supply 60 includes processor 61, interface circuit 62 and bus 64, and bus 64 is for realizing the connection communication between processor 61 and interface circuit 62.As shown in figure 9, can also include memory 63 in the far end supply 60.
It should be noted that processor 61 here can be a processing element, it is also possible to the general designation of multiple processing elements.Such as, the processing element can be central processing unit (English: Central Processing Unit, referred to as: CPU), it is also possible to specific integrated circuit (English: Application Specific Integrated Circuit, referred to as: ASIC), or be arranged to implement one or more integrated circuits of the embodiment of the present invention, such as: one or more microprocessors (English: digital singnal processor, referred to as: DSP), or, one or more field programmable gate array (English: Field Programmable Gate Array, abbreviation: FPGA).
Memory 63 can be a storage device, be also possible to the general designation of multiple memory elements, and run required parameter, data etc. for storing executable program code or access net management equipment.And memory 63 may include random access memory (referred to as: RAM), also may include nonvolatile memory (English: non-volatile memory), such as magnetic disk storage, flash memory (referred to as: Flash) etc..
Bus 64 can be industry standard architecture (English: Industry Standard Architecture, referred to as: ISA) bus, external equipment interconnection (English: Peripheral Component, referred to as: PCI) bus or extended industry-standard architecture (English: Extended Industry Standard Architecture, abbreviation: EISA) bus etc..The bus 64 can be divided into address bus, data/address bus, control bus etc..Only to be indicated with a thick line in Fig. 9, it is not intended that an only bus or a type of bus convenient for indicating.
The far end supply 60 can also include input/output unit, be connected to bus 64, to be connect by bus 64 with other parts such as processors 61.
Wherein, processor 61 calls the program code in memory 63, for executing the operation that far end supply 60 executes in above method embodiment.E.g., including:
Reference threshold is determined by interface circuit 62, the parameter of reference threshold is the input power of far end supply when being maximum value far end supply, parameter is input current value, input voltage value or the input equivalent impedance of far end supply, and the input power of far end supply is the difference of the loss of the output power and transmission line of local supply.
The actual parameter of current time far end supply is obtained by interface circuit 62.
According to the size relation between the actual parameter and reference threshold of the current time far end supply obtained by interface circuit 62, the output power for reducing far end supply is determined whether by processor 61.
When determining the output power for reducing far end supply, reduce the output power of far end supply by processor 61.
In an implementation of the embodiment of the present invention, it can specifically pass through interface circuit 62 Obtain the input voltage of the first moment far end supply and the input voltage and input current of input current and the second moment far end supply；
According to the input voltage of the first moment far end supply and input current and the input voltage and input current of the second moment far end supply, specifically reference threshold can be determined by interface circuit 62.
In an implementation of the embodiment of the present invention, interface circuit 62, specifically for when parameter be far end supply input voltage, and the input power of far end supply be maximum value when, the input voltage of far end supplyWherein, I_line_1 is the input current of the first moment far end supply, and I_line_2 is the input current of the second moment far end supply, and V_re_in_1 is the input voltage of the first moment far end supply, and V_re_in_2 is the input voltage of the second moment far end supply；
Alternatively,
When parameter is the input current of far end supply, and the input power of far end supply is maximum value, the input current of far end supply
Alternatively,
When parameter is the input equivalent impedance of far end supply, and the input power of far end supply is maximum value, the input terminal equivalent impedance of far end supply
In an implementation of the embodiment of the present invention, the input voltage of reference threshold is the input power of far end supply when being maximum value far end supply, processor 61, specifically for reducing the output power of far end supply when determining the input voltage of far end supply when the input power that the input voltage of current time far end supply is less than far end supply is maximum value；
Alternatively,
The input current of reference threshold is the input power of far end supply when being maximum value far end supply, when determining the input current of far end supply when the input power that the input current of current time far end supply is greater than far end supply is maximum value, reduce the output power of far end supply；
Alternatively,
The input terminal equivalent impedance of reference threshold is the input power of far end supply when being maximum value far end supply, when determining that the input terminal equivalent impedance when current time far end supply is less than distal end When the input power of power supply is maximum value when the input terminal equivalent impedance of far end supply, reduce the output power of far end supply, wherein, the input terminal equivalent impedance of current time far end supply is the ratio of the input voltage of current time far end supply and the input current of current time far end supply.
In an implementation of the embodiment of the present invention, the actual parameter of far end supply includes the input voltage of far end supply, interface circuit 62 is also used to obtain the actual parameter of current time local supply, and the actual parameter of local supply includes the output voltage of local supply.
Processor 61 is also used to according to the size relation between the actual parameter of current time far end supply and the actual parameter of current time local supply obtained by interface circuit 62, it is determined whether reduce the output power of far end supply.
A kind of far end supply provided in an embodiment of the present invention, according to the actual parameter and identified reference threshold of acquired current time far end supply, it is determined whether reduce the output power of far end supply, later when determining the output power for reducing far end supply, reduce the output power of far end supply.It is compared in the prior art when system works near route maximum power point, often due to increasing load and load equipment being caused to be changed to the working condition in low-voltage, high-current from the working condition in high voltage-small current, or the load equipment for being in low-voltage, high-current working condition is made to be in the working condition of more low-voltage more high current, the present invention can be according to the relationship between actual parameter and reference threshold, to determine the need for reducing the output power of far end supply, later by adjusting the output power of far end supply, achieve the effect that the maximum value for limiting line current.Therefore, system steady operation near route maximum power point can be made, and improve the working efficiency of system.
The embodiment of the present invention provides a kind of remote feeding power system, includes local supply and far end supply in remote feeding power system, and the output end of local supply and the input terminal of far end supply are connected by transmission line, and far end supply is far end supply as shown in Figure 9.
A kind of remote feeding power system provided in an embodiment of the present invention, far end supply in remote feeding power system is according to the actual parameter of acquired current time far end supply, and identified reference threshold, determine whether the output power of reduction far end supply, later when determining the output power for reducing far end supply, reduce the output power of far end supply.It is compared in the prior art when system works near route maximum power point, often due to increasing load and leading Load equipment is caused to be changed to the working condition in low-voltage, high-current from the working condition in high voltage-small current, or the load equipment for being in low-voltage, high-current working condition is made to be in the working condition of more low-voltage more high current, the present invention can be according to the relationship between actual parameter and reference threshold, to determine the need for reducing the output power of far end supply, later by adjusting the output power of far end supply, achieve the effect that the maximum value for limiting line current.Therefore, system steady operation near route maximum power point can be made, and improve the working efficiency of system.
All the embodiments in this specification are described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments.For apparatus embodiments, since it is substantially similar to the method embodiment, so describing fairly simple, the relevent part can refer to the partial explaination of embodiments of method.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, it is that relevant hardware can be instructed to complete by computer program, the program can be stored in computer-readable storage medium, the program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic disk, CD, read-only memory (English: Read-Only Memory, abbreviation: ROM) or random access memory (English: Random Access Memory, abbreviation: RAM) etc..
It is described above; only a specific embodiment of the invention, but scope of protection of the present invention is not limited thereto, and anyone skilled in the art is in the technical scope disclosed by the present invention; any changes or substitutions that can be easily thought of, should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.

Claims (16)

  1. Circuit control method in a kind of remote feeding power system, which is characterized in that include local supply and far end supply in the remote feeding power system, the output end of the local supply is connect with the input terminal of the far end supply by transmission line, which comprises
    Determine reference threshold, the parameter of the reference threshold is the input power of the far end supply when the being maximum value far end supply, the parameter is input current value, input voltage value or the input equivalent impedance of the far end supply, and the input power of the far end supply is the difference of the loss of the output power and the transmission line of the local supply；
    Obtain the actual parameter of far end supply described in current time；
    According to the size relation between the actual parameter of far end supply described in the current time and the reference threshold, it is determined whether reduce the output power of the far end supply；
    When determining the output power for reducing the far end supply, reduce the output power of the far end supply.
  2. The method according to claim 1, wherein the determining reference threshold, comprising:
    Obtain far end supply described in the first moment input voltage and input current and the second moment described in far end supply input voltage and input current；
    According to the input voltage and input current of far end supply described in the input voltage of far end supply described in first moment and input current and second moment, the reference threshold is determined.
  3. According to the method for claim 2, it is characterized in that, the input voltage and input current of far end supply described in the input voltage and input current of the far end supply according to first moment and second moment, determine the reference threshold, comprising:
    When the parameter is the input voltage of the far end supply, and the input power of the far end supply is maximum value, the input voltage of the far end supplyWherein, I_line_1 is the input current of far end supply described in first moment, I_line_2 is the input current of far end supply described in second moment, V_re_in_1 is the input voltage of far end supply described in first moment, and V_re_in_2 is the input voltage of far end supply described in second moment；
    Alternatively,
    When the parameter is the input current of the far end supply, and the input power of the far end supply is maximum value, the input current of the far end supply
    Alternatively,
    When the parameter is the input equivalent impedance of the far end supply, and the input power of the far end supply is maximum value, the input terminal equivalent impedance of the far end supply
  4. Method according to claim 1 to 3, which is characterized in that the size relation between the parameter and the reference threshold of the far end supply according to the current time, it is determined whether reduce the output power of the far end supply, comprising:
    The input voltage of the reference threshold is the input power of the far end supply when the being maximum value far end supply, when the input power that the input voltage for determining the far end supply described in the current time is less than the far end supply is maximum value when the input voltage of the far end supply, reduce the output power of the far end supply；
    Alternatively,
    The input current of the reference threshold is the input power of the far end supply when the being maximum value far end supply, when the input power that the input current for determining the far end supply described in the current time is greater than the far end supply is maximum value when the input current of the far end supply, reduce the output power of the far end supply；
    Alternatively,
    The input terminal equivalent impedance of the reference threshold is the input power of the far end supply when the being maximum value far end supply, when the input power that the input terminal equivalent impedance for determining the far end supply described in the current time is less than the far end supply is maximum value when the input terminal equivalent impedance of the far end supply, reduce the output power of the far end supply, wherein, the input terminal equivalent impedance of far end supply described in the current time is the ratio of the input voltage and the input current of far end supply described in the current time of far end supply described in the current time.
  5. Method according to any one of claims 1-4, which is characterized in that the actual parameter of the far end supply includes the input voltage of the far end supply, is reduced described when determining When the output power of the far end supply, before the output power for reducing the far end supply, comprising:
    The actual parameter of local supply described in the current time is obtained, the actual parameter of the local supply includes the output voltage of the local supply；
    According to the size relation between the actual parameter of local supply described in the actual parameter of far end supply described in the current time and the current time, it is determined whether reduce the output power of the far end supply.
  6. A kind of circuit control device in remote feeding power system, it is characterized in that, described device is used for a kind of remote feeding power system, it include local supply and far end supply in the remote feeding power system, the output end of the local supply is connect with the input terminal of the far end supply by transmission line, and described device includes:
    Determining module, for determining reference threshold, the parameter of the reference threshold is the input power of the far end supply when the being maximum value far end supply, the parameter is input current value, input voltage value or the input equivalent impedance of the far end supply, and the input power of the far end supply is the difference of the loss of the output power and the transmission line of the local supply；
    Module is obtained, for obtaining the actual parameter of far end supply described in current time；
    The determining module, the size relation being also used between the actual parameter and the reference threshold of the far end supply according to the current time of the acquisition module acquisition, it is determined whether reduce the output power of the far end supply；
    Module is adjusted, for reducing the output power of the far end supply when the determining module determines the output power for reducing the far end supply.
  7. Device according to claim 6, which is characterized in that the determining module, specifically for obtain the first moment described in far end supply input voltage and input current and the second moment described in far end supply input voltage and input current；
    According to the input voltage and input current of far end supply described in the input voltage of far end supply described in first moment and input current and second moment, the reference threshold is determined.
  8. Device according to claim 7, which is characterized in that the determining module, specifically for when the parameter be the far end supply input voltage, and the input power of the far end supply be maximum value when, the input voltage of the far end supply Wherein, I_line_1 is the input current of far end supply described in first moment, I_line_2 is the input current of far end supply described in second moment, V_re_in_1 is the input voltage of far end supply described in first moment, and V_re_in_2 is the input voltage of far end supply described in second moment；
    Alternatively,
    When the parameter is the input current of the far end supply, and the input power of the far end supply is maximum value, the input current of the far end supply
    Alternatively,
    When the parameter is the input equivalent impedance of the far end supply, and the input power of the far end supply is maximum value, the input terminal equivalent impedance of the far end supply
  9. According to the device any in claim 6-8, it is characterized in that, the determining module, the input voltage of far end supply when specifically for the input power that the reference threshold is the far end supply being maximum value, when the input power that the input voltage for determining the far end supply described in the current time is less than the far end supply is maximum value when the input voltage of the far end supply, reduce the output power of the far end supply；
    Alternatively,
    The input current of the reference threshold is the input power of the far end supply when the being maximum value far end supply, when the input power that the input current for determining the far end supply described in the current time is greater than the far end supply is maximum value when the input current of the far end supply, reduce the output power of the far end supply；
    Alternatively,
    The input terminal equivalent impedance of the reference threshold is the input power of the far end supply when the being maximum value far end supply, when the input power that the input terminal equivalent impedance for determining the far end supply described in the current time is less than the far end supply is maximum value when the input terminal equivalent impedance of the far end supply, reduce the output power of the far end supply, wherein, the input terminal equivalent impedance of far end supply described in the current time is distal end electricity described in the current time The ratio of the input current of far end supply described in the input voltage in source and the current time.
  10. According to the device any in claim 6-9, it is characterized in that, the actual parameter of the far end supply includes the input voltage of the far end supply, the acquisition module, it is also used to obtain the actual parameter of local supply described in the current time, the actual parameter of the local supply includes the output voltage of the local supply；
    The determining module, size relation between the actual parameter of local supply described in the actual parameter of far end supply described in the current time for being also used to be obtained according to the acquisition module and the current time, it is determined whether reduce the output power of the far end supply.
  11. A kind of far end supply, it is characterized in that, the far end supply is used for a kind of remote feeding power system, it include local supply and the far end supply in the remote feeding power system, the output end of the local supply is connect with the input terminal of the far end supply by transmission line, the far end supply includes processor, interface circuit and bus, and the bus is for realizing the connection communication between the processor and the interface circuit；
    The interface circuit, for determining reference threshold, the parameter of the reference threshold is the input power of the far end supply when the being maximum value far end supply, the parameter is input current value, input voltage value or the input equivalent impedance of the far end supply, and the input power of the far end supply is the difference of the loss of the output power and the transmission line of the local supply；
    The interface circuit is also used to obtain the actual parameter of far end supply described in current time；
    The processor, for the size relation between the actual parameter and the reference threshold of the far end supply according to the current time obtained by the interface circuit, it is determined whether reduce the output power of the far end supply；
    The processor is also used to reduce the output power of the far end supply when determining the output power for reducing the far end supply.
  12. Far end supply according to claim 11, which is characterized in that the interface circuit, specifically for obtain the first moment described in far end supply input voltage and input current and the second moment described in far end supply input voltage and input current；
    According to the input voltage and input current of far end supply described in the input voltage of far end supply described in first moment and input current and second moment, the reference threshold is determined.
  13. Far end supply according to claim 12, which is characterized in that the interface circuit, specifically for when the parameter be the far end supply input voltage, and the input power of the far end supply be maximum value when, the input voltage of the far end supplyWherein, I_line_1 is the input current of far end supply described in first moment, I_line_2 is the input current of far end supply described in second moment, V_re_in_1 is the input voltage of far end supply described in first moment, and V_re_in_2 is the input voltage of far end supply described in second moment；
    Alternatively,
    When the parameter is the input current of the far end supply, and the input power of the far end supply is maximum value, the input current of the far end supply
    Alternatively,
    When the parameter is the input equivalent impedance of the far end supply, and the input power of the far end supply is maximum value, the input terminal equivalent impedance of the far end supply
  14. Any far end supply in 1-13 according to claim 1, it is characterized in that, the input voltage of the reference threshold is the input power of the far end supply when the being maximum value far end supply, the processor, input power specifically for being less than the far end supply when the input voltage for determining the far end supply described in the current time when input voltage of the far end supply, reduces the output power of the far end supply when being maximum value；
    Alternatively,
    The input current of the reference threshold is the input power of the far end supply when the being maximum value far end supply, when the input power that the input current for determining the far end supply described in the current time is greater than the far end supply is maximum value when the input current of the far end supply, reduce the output power of the far end supply；
    Alternatively,
    The input terminal equivalent impedance of the reference threshold is the input power of the far end supply when the being maximum value far end supply, when the input terminal equivalent impedance for determining the far end supply described in the current time is less than the far end supply when input power of the far end supply is maximum value Input terminal equivalent impedance when, reduce the output power of the far end supply, wherein, the input terminal equivalent impedance of far end supply described in the current time is the ratio of the input voltage and the input current of far end supply described in the current time of far end supply described in the current time.
  15. Any far end supply in 1-14 according to claim 1, it is characterized in that, the actual parameter of the far end supply includes the input voltage of the far end supply, the interface circuit, it is also used to obtain the actual parameter of local supply described in the current time, the actual parameter of the local supply includes the output voltage of the local supply；
    The processor, be also used to the far end supply according to the current time obtained by the interface circuit actual parameter and the current time described in local supply actual parameter between size relation, it is determined whether reduce the output power of the far end supply.
  16. A kind of remote feeding power system, it is characterized in that, it include local supply and far end supply in the remote feeding power system, the output end of the local supply is connect with the input terminal of the far end supply by transmission line, and the far end supply is any far end supply in claim 11-15.
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