CN110957798B - Parallel power supply efficiency optimization method and system - Google Patents
Parallel power supply efficiency optimization method and system Download PDFInfo
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- CN110957798B CN110957798B CN201911128727.7A CN201911128727A CN110957798B CN 110957798 B CN110957798 B CN 110957798B CN 201911128727 A CN201911128727 A CN 201911128727A CN 110957798 B CN110957798 B CN 110957798B
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The application relates to a method and a system for optimizing efficiency of a parallel power supply. The parallel power supply efficiency optimization method can carry out power disturbance processing on each power supply by adopting a droop curve control method according to the slope disturbance quantity, and obtain the input power and the output power of each power supply after disturbance. And respectively calculating the output power variation and the power loss variation of each power supply, calculating the slope of a loss curve of each power supply according to the output power variation and the power loss variation, and adjusting the power of each power supply according to the slope of the loss curve of each power supply. The parallel power supply efficiency optimization method only needs to realize the perception of the slope of the loss curve near the working point through the disturbance of the droop curve of the parallel power supply efficiency optimization method, and then reasonably adjusts the output power of the parallel power supply efficiency optimization method, so that the efficiency optimization of a parallel power supply system is realized, and the control process is simple. By sensing the slope of the loss curve, the whole efficiency curve or the loss curve does not need to be measured and fitted in advance, and the application range of the parallel power supply efficiency optimization method can be enlarged.
Description
Technical Field
The application relates to the technical field of electrical engineering, in particular to a method and a system for optimizing efficiency of a parallel power supply.
Background
With the development of dc converters, in order to solve the problems of increasing current stress and thermal stress of a single converter, expensive power switching devices, and the like, a parallel technology of a plurality of power modules is widely adopted in dc converters. Because the efficiency curves of the dc converters are different under different output powers, and the overall system efficiency is determined by the current efficiency of each converter, it is necessary to adopt a method to reasonably distribute each power supply current so as to optimize the efficiency of the parallel power supply system.
In order to improve the efficiency of the parallel power supply system, two approaches are mainly adopted in the prior art. One is that each power supply adopts a pure current sharing mode, and the method is only suitable for power supplies with the same capacity and efficiency curves meeting certain conditions, and has low universality and poor accuracy; in the other method, the efficiency curve parameters of each power supply are transmitted to the centralized controller, the output of each power supply when the system efficiency is optimal is calculated by the centralized controller through various algorithms and is sent to each power supply as an instruction.
Disclosure of Invention
Therefore, it is necessary to provide a method and a system for optimizing the efficiency of the parallel power supply, aiming at the problems of poor universality and complex control process in the prior art for improving the efficiency of the parallel power supply.
The application provides a method for optimizing efficiency of a parallel power supply, which comprises the following steps:
acquiring input power and output power of each power supply in parallel power supplies;
performing power disturbance processing on each power supply by adopting a droop curve control method according to the slope disturbance quantity, and acquiring input power and output power of each power supply after disturbance;
respectively calculating the output power variation and the power loss variation of each power supply according to the input power and the output power of each power supply and the input power and the output power after disturbance;
calculating the slope of a loss curve of each power supply according to the output power variation and the power loss variation of each power supply;
and adjusting the power of each power supply according to the slope of the loss curve of each power supply.
In one embodiment, the adjusting the power of each power source according to the slope of the loss curve of each power source includes:
judging whether the slopes of the loss curves of any two power supplies in the parallel power supplies are equal or not;
if the slopes of the loss curves of any two power supplies in the parallel power supplies are judged to be equal, the power adjustment process of each power supply is completed;
otherwise, updating the slope disturbance quantity according to the slope of the loss curve of each power supply to obtain the updated slope disturbance quantity of each power supply, and returning to the step of acquiring the input power and the output power of each power supply in the parallel power supply.
In one embodiment, the step of calculating the power loss variation of each of the power sources includes:
calculating the power loss of each power supply according to the input power and the output power of each power supply;
calculating the power loss of each power supply after disturbance according to the input power and the output power of each power supply after disturbance;
and calculating the power loss variation of each power supply according to the power loss of each power supply and the power loss after disturbance.
In one embodiment, the power loss of each power source is a difference between an input power and an output power of each power source, and the power loss after each power source disturbance is a difference between a disturbed input power and an output power of each power source.
In one embodiment, the updated slope perturbation amount of each power supply is inversely proportional to the slope of the loss curve of each power supply.
In one embodiment, the slope disturbance amount after each power supply update is
Δk＝-b(kloss-a)*k
Where k is the slope of the droop curve for each of the power sources, a and b are non-zero constants (b)>0)，klossThe slope of the loss curve for each of the power supplies.
In one embodiment, the slope of the loss curve of each power supply is a ratio of an output power variation and a power loss variation of each power supply.
In one embodiment, the performing, according to the slope disturbance amount, power disturbance processing on each power supply, and acquiring input power and output power of each power supply after disturbance includes:
updating the slope of the droop curve of each power supply according to the slope disturbance quantity to obtain the slope of the droop curve after each power supply is disturbed;
and according to the slope of the droop curve after each power source disturbance, performing power disturbance on each power source by adopting the droop curve control method, and acquiring the input power and the output power of each power source after disturbance.
In one embodiment, the initial value of the slope disturbance amount is a preset proportion of the initial slope of the droop curve.
In one embodiment, the obtaining the input power and the output power of each power supply in the parallel power supplies comprises:
acquiring the input current and the input voltage of each power supply in the parallel power supplies, and calculating the input power of each power supply according to the input current and the input voltage of each power supply;
and acquiring the output current and the output voltage of each power supply, and calculating the output power of each power supply according to the output current and the output voltage of each power supply.
Based on the same inventive concept, the present application further provides a parallel power efficiency optimization system, comprising:
a plurality of power supplies connected in parallel with each other;
the detection unit is electrically connected with the power supplies respectively and is used for acquiring the input power and the output power of each power supply;
the disturbance control unit is electrically connected with the power supplies respectively and is used for adjusting the power of each power supply;
the data processing unit is electrically connected with the detection unit and used for receiving the input power and the output power of each power supply before and after the power disturbance, calculating the output power variation and the power loss variation of each power supply according to the input power and the output power of each power supply before and after the power disturbance, and calculating the slope of a loss curve of each power supply according to the output power variation and the power loss variation of each power supply; and
and the main control unit is respectively electrically connected with the disturbance control unit and the data processing unit and is used for receiving the slope of the loss curve of each power supply, generating a control command according to the slope of the loss curve of each power supply and sending the control command to the disturbance control unit.
According to the parallel power supply efficiency optimization method, power disturbance processing can be performed on each power supply by adopting a droop curve control method according to the slope disturbance quantity, and input power and output power of each power supply after disturbance are obtained. After the input power and the output power of each power supply in the parallel power supplies are obtained, the output power variation and the power loss variation of each power supply are respectively calculated according to the input power and the output power of each power supply and the input power and the output power after disturbance, the slope of a loss curve of each power supply is calculated according to the output power variation and the power loss variation of each power supply, and the power of each power supply is adjusted according to the slope of the loss curve of each power supply. The parallel power supply efficiency optimization method can be understood without connecting and communicating with a unified control device, perception of the slope of the loss curve near the working point can be achieved only through the disturbance of the droop curve of the parallel power supply efficiency optimization method, the output power of the parallel power supply efficiency optimization method can be adjusted reasonably, and therefore the efficiency optimization of a parallel power supply system is achieved, and the control process is simple. By sensing the slope of the loss curve, the whole loss curve does not need to be measured in advance and fitted, and the application range of the parallel power supply efficiency optimization method can be enlarged.
Drawings
Fig. 1 is a flowchart of a parallel power supply efficiency optimization method provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a parallel power supply system according to an embodiment of the present disclosure;
FIG. 3 is a schematic view of a droop curve perturbation provided by an embodiment of the present application;
fig. 4 is a schematic diagram of a stop condition of a parallel power supply efficiency optimization method according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of an efficiency optimization result of a parallel power supply according to an embodiment of the present disclosure.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, the present application provides a method for optimizing efficiency of a parallel power supply, including:
step S100, acquiring input power and output power of each power supply in parallel power supplies;
step S200, according to the slope disturbance quantity, performing power disturbance processing on each power supply by adopting a droop curve control method, and acquiring input power and output power of each power supply after disturbance;
step S300, respectively calculating the output power variation and the power loss variation of each power supply according to the input power and the output power of each power supply and the input power and the output power after disturbance;
step S400, calculating the slope of the loss curve of each power supply according to the output power variation and the power loss variation of each power supply;
step S500, adjusting the power of each power supply according to the slope of the loss curve of each power supply.
It will be appreciated that the shape of the power loss curve may directly affect the overall efficiency optimization control strategy of the parallel power system. The ordinate of the loss curve may be the power loss of the power supply itself, and the abscissa may be the current output power of the power supply, and for each power supply, the power loss increases with the increase of the output power of the power supply. Referring to fig. 2, in one embodiment, for a parallel power system using two power sources, the total loss expression of the parallel power system before and after disturbance is:
Plosssum＝PlossA+PlossB
Plosssum′＝PlossA′+PlossB′
＝(PlossA+klossA*ΔPA)+(PlossB+klossB*ΔPB)
＝(PlossA+klossA*ΔPA)+(PlossB-klossB*ΔPA)
＝PlossA+PlossB+(klossA-klossB)*ΔPA
wherein, PlosssumIs total loss of parallel power supply system before disturbance, Plosssum' is the total loss of the parallel power system after disturbance. Further, Δ PA、ΔPBOutput power variation for power supply A and power supply B respectivelyChemical quantity, klossA、klossBThe slopes of the loss curves for power supply a and power supply B, respectively.
According to the total loss expression of the parallel power supply system before and after disturbance, when the slope k of the loss curve near the working pointlossA<klossBWhen the power supply A increases the output power (Δ P)A>0) When the power supply B reduces the output power, the total loss of the parallel power supply system is reduced; when k islossA>klossBWhen time comes, i.e. the power supply A reduces the output power (Δ P)A<0) When the output power of the power supply B is increased, the total loss of the parallel power supply system is also reduced. Therefore, in the parallel power supply system, the slope of the loss curve is large, which tends to reduce the output power, and the slope of the loss curve is small, which tends to increase the output power, so as to reduce the total loss of the parallel power supply system. In the analysis process, the total power of the parallel power supply system needs to be kept unchanged. Therefore, the parallel power supply efficiency optimization method can be provided by constructing the incidence relation between the slope of the loss curve and the power disturbance quantity.
In step S100, the input power and the output power of each power supply in the parallel power supplies may be obtained by obtaining an input current, an input voltage, an output current, and an output voltage of each power supply. The input current, the input voltage, the output current and the output voltage of each power supply can be obtained by a sampling circuit of the power supply, and the calculation process related to the parameters, namely the process of calculating the input power and the output power, can be realized by a Processor such as a Digital Signal Processor (DSP) of the power supply.
In step S200, according to the slope disturbance amount, a droop curve control method is used to perform power disturbance processing on each power supply, and the input power and the output power after each power supply disturbance are obtained. In one embodiment, the output power of each power supply in the parallel power supply system can be controlled by a voltage-current droop control method, and the output voltage-current characteristic curve of each power supply can be shown in fig. 3. It can be understood that when the droop coefficient of a certain power supply is adjusted to be large, the power output is reduced; when the droop coefficient is adjusted, the power output increases. Therefore, each power supply in the parallel power supply system can change the power output thereof by adjusting the slope of the droop curve, namely, the power disturbance can be generated by the method of disturbance slope.
It can be understood that in the process of autonomous optimization of each power supply, the droop coefficient can be controlled by a program to increase or reduce the disturbance, that is, each power supply in the parallel power supply system can sense the slope of the loss curve near the working point through the droop curve disturbance, and then the output power of the power supply can be reasonably adjusted, so that the efficiency optimization of the parallel power supply system is realized. Therefore, the parallel power supply efficiency optimization method provided by the application does not need complex connection and communication control between each power supply and the centralized controller, can achieve a stable state only by carrying out self optimization through distributed control, and further realizes the efficiency optimization of a parallel power supply system.
In step S300, an output power variation and a power loss variation of each power supply are calculated based on the input power and the output power of each power supply and the input power and the output power after the disturbance, respectively. In one embodiment, the step of calculating the power loss variation for each power source comprises: the power loss of each power supply is calculated from the input power and the output power of each power supply. And calculating the power loss of each power supply after disturbance according to the input power and the output power of each power supply after disturbance. And calculating the power loss variation of each power supply according to the power loss of each power supply and the power loss after disturbance. The power loss of each power supply is the difference value of the input power and the output power of each power supply, and the power loss after disturbance of each power supply is the difference value of the input power and the output power after disturbance of each power supply. The power loss variation may be a difference between power losses before and after the disturbance, or may be a difference between power losses of two adjacent disturbances. The parallel power supply efficiency optimization method can be understood without measuring and fitting the whole efficiency curve or loss curve in advance, can sense the change trend of the efficiency curve or loss curve in real time in the disturbance process, can enlarge the application range of the parallel power supply efficiency optimization method, and can be used for scenes in which the efficiency curve or loss curve is continuously changed under the influence of different environmental parameters.
In step S400, a slope of a loss curve of each power supply is calculated based on the amount of change in output power and the amount of change in power loss of each power supply. In one embodiment, the slope of the loss curve for each power supply is the ratio of the amount of change in output power to the amount of change in power loss for each power supply. It can be understood that, at the beginning of the operation of the parallel power supply efficiency optimization method, each power supply in the parallel power supply system can be subjected to droop curve disturbance according to the initial disturbance quantity Δ k preset in the program. In this case, the output power variation Δ P and the power loss variation Δ P for each power supply can be obtainedlossAnd further by formula kloss＝△P/△PlossThe slope of the loss curve can be obtained. It can be understood that the above process of calculating the slope of the loss curve is a process of disturbing the trend of the perceived loss curve.
According to the parallel power supply efficiency optimization method, power disturbance processing can be performed on each power supply by adopting a droop curve control method according to the slope disturbance quantity, and input power and output power of each power supply after disturbance are obtained. After the input power and the output power of each power supply in the parallel power supplies are obtained, the output power variation and the power loss variation of each power supply are respectively calculated according to the input power and the output power of each power supply and the input power and the output power after disturbance, the slope of a loss curve of each power supply is calculated according to the output power variation and the power loss variation of each power supply, and the power of each power supply is adjusted according to the slope of the loss curve of each power supply. The parallel power supply efficiency optimization method does not need to be connected with a control device and communicated with the control device, perception of the slope of the loss curve near the working point is achieved only through the disturbance of the droop curve of the parallel power supply efficiency optimization method, the output power of the parallel power supply efficiency optimization method is adjusted reasonably, and therefore the efficiency optimization of a parallel power supply system is achieved, and the control process is simple. By sensing the slope of the loss curve, the whole efficiency curve or the loss curve does not need to be measured in advance and fitted, and the application range of the parallel power supply efficiency optimization method can be enlarged.
In one embodiment, adjusting the power of each power source according to the slope of the loss curve of each power source comprises: and judging whether the slopes of the loss curves of any two power supplies in the parallel power supplies are equal or not. And if the slopes of the loss curves of any two power supplies in the parallel power supplies are judged to be equal, the power adjustment process of each power supply is completed. Otherwise, updating the slope disturbance quantity according to the slope of the loss curve of each power supply to obtain the updated slope disturbance quantity of each power supply, and returning to the step of acquiring the input power and the output power of each power supply in the parallel power supplies.
In one embodiment, the updated slope perturbation for each power supply is inversely proportional to the slope of the loss curve for each power supply. In one embodiment, the slope perturbation after each power update is
△k＝-b(kloss-a)*k
Where k is the slope of the current droop curve for each power supply, a and b are non-zero constants (b)>0)，klossThe slope of the loss curve for each power supply. It is understood that the values of a and b are used only to indicate klossThe inverse relation to Δ k needs to be set according to the actual optimization process.
Referring also to fig. 4, the parallel power efficiency optimization process may end at the point where all power loss curves in the nearest parallel system from the current operating point have equal slopes. Assuming that the power supply a and the power supply B initially operate at points a0 and B0, respectively, according to the parallel power supply efficiency optimization method, the operating points a0 and B0 may be controlled to move in the arrow direction until points a1 and B1 where the slopes of the loss curves of the power supply a and the power supply B are equal, respectively. By Δ k ═ b (k)lossA) k, Δ k is still present. However, since k islossA＝klossBAnd the delta k/k values of the power supply A and the power supply B are the same, and at the moment, the slopes of two power supply droop curves are proportionally increased or decreased to be disturbed, so that only the output voltage is changed without changing the output power distribution ratio. Thus, the parallel power supply efficiency optimization method, i.e. the disturbance, may be stopped when it is perceived that the slopes of the loss curves of the two power supplies are equal.
Referring also to FIG. 5, in one embodiment, the total output of the parallel power systems is setThe power requirement is P. At this time, the power of two power supplies in the parallel power supply system is distributed to be P between the power supply A and the power supply BAAnd PB(PA+PBP), the power supply A, B is perturbed at this time in the droop curve, and the power supply a has a lower slope in the loss curve of the power supply B near the operating point due to the perturbation. At this time, the output power is adjusted to increase the output power of the power supply a and decrease the output power of the power supply B, so that the total loss can be reduced. Referring to fig. 4, the current total loss (P) of the power-adjusted parallel power supply system can be intuitively obtained from fig. 4lossA’+PlossB') less than the total loss (P) of the parallel power supply system before disturbance optimizationlossA+PlossB)。
In one embodiment, performing power disturbance processing on each power supply according to the slope disturbance amount, and acquiring input power and output power after each power supply is disturbed includes: and updating the slope of the droop curve of each power supply according to the slope disturbance quantity to obtain the slope of the droop curve after each power supply is disturbed. And according to the slope of the droop curve after each power source disturbance, performing power disturbance on each power source by adopting a droop curve control method, and acquiring the input power and the output power of each power source after the disturbance.
It will be appreciated that the specific perturbation process for each power supply may be: firstly, the droop curve is disturbed by taking the delta k as an initial disturbance quantity, and the output power variation delta P and the loss variation delta P of the power supply can be calculated and obtained at the momentlossAnd further calculating to obtain the slope k of the loss curve of the power supplyloss＝△P/△Ploss. Then, according to the slope k of the loss curvelossUpdating the value of Δ k such that Δ k and klossIn inverse proportion to achieve the purpose of optimizing efficiency. And finally, according to the slope of the droop curve after each power source disturbance, performing power disturbance on each power source by adopting a droop curve control method, and acquiring the input power and the output power of each power source after disturbance.
In one embodiment, the initial value of the slope disturbance amount is a predetermined proportion of the initial slope of the droop curve. It can be understood that the initial disturbance amount is not particularly limited in the present application as long as it can meet the requirements of the parallel power supply efficiency optimization method. In one embodiment, the initial slope perturbation Δ k may be 1% of the initial slope k. The initial value of the slope disturbance quantity is the preset proportion of the initial slope of the droop curve, so that the initial disturbance quantity can be prevented from being improperly set, and the accuracy of the parallel power supply efficiency optimization method can be improved to a certain extent.
In one embodiment, obtaining the input power and the output power of each of the parallel power supplies comprises: the input current and the input voltage of each power supply in the parallel power supplies are obtained, and the input power of each power supply is calculated according to the input current and the input voltage of each power supply. And acquiring the output current and the output voltage of each power supply, and calculating the output power of each power supply according to the output current and the output voltage of each power supply.
Based on the same inventive concept, the application also provides a parallel power supply efficiency optimization system. The parallel power supply efficiency optimization system comprises a plurality of power supplies, a detection unit, a disturbance control unit, a data processing unit and a main control unit. The plurality of power supplies are connected in parallel with each other. The detection unit is electrically connected with the plurality of power supplies respectively and is used for acquiring the input power and the output power of each power supply. The disturbance control unit is electrically connected with the plurality of power supplies respectively and is used for adjusting the power of each power supply. The data processing unit is electrically connected with the detection unit and used for receiving the input power and the output power of each power supply before and after power disturbance, calculating the output power variation and the power loss variation of each power supply according to the input power and the output power of each power supply before and after power disturbance, and calculating the slope of the loss curve of each power supply according to the output power variation and the power loss variation of each power supply. The main control unit is respectively electrically connected with the disturbance control unit and the data processing unit and is used for receiving the slope of the loss curve of each power supply, generating a control instruction according to the slope of the loss curve of each power supply and sending the control instruction to the disturbance control unit.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for optimizing efficiency of a parallel power supply is applied to a direct current converter, and is characterized by comprising the following steps:
acquiring input power and output power of each power supply in parallel power supplies;
performing power disturbance processing on each power supply by adopting a droop curve control method according to a slope disturbance quantity, and acquiring input power and output power of each power supply after disturbance, wherein the slope disturbance quantity is delta k-b (k)loss-a)*k
Where k is the slope of the droop curve for each of the power sources, a and b are non-zero constants, klossA slope of a loss curve for each of said power supplies;
respectively calculating the output power variation and the power loss variation of each power supply according to the input power and the output power of each power supply and the input power and the output power after disturbance;
calculating the slope of a loss curve of each power supply according to the output power variation and the power loss variation of each power supply;
and adjusting the power of each power supply according to the slope of the loss curve of each power supply.
2. The method of claim 1, wherein the adjusting the power of each power source according to the slope of the loss curve of each power source comprises:
judging whether the slopes of the loss curves of any two power supplies in the parallel power supplies are equal or not;
if the slopes of the loss curves of any two power supplies in the parallel power supplies are judged to be equal, the power adjustment process of each power supply is completed;
otherwise, updating the slope disturbance quantity according to the slope of the loss curve of each power supply to obtain the updated slope disturbance quantity of each power supply, and returning to the step of acquiring the input power and the output power of each power supply in the parallel power supply.
3. The parallel power supply efficiency optimization method of claim 1, wherein the step of calculating the power loss variation of each of the power supplies comprises:
calculating the power loss of each power supply according to the input power and the output power of each power supply;
calculating the power loss of each power supply after disturbance according to the input power and the output power of each power supply after disturbance;
and calculating the power loss variation of each power supply according to the power loss of each power supply and the power loss after disturbance.
4. The parallel power supply efficiency optimization method of claim 3, wherein the power loss of each of the power supplies is a difference between an input power and an output power of each of the power supplies, and the perturbed power loss of each of the power supplies is a difference between a perturbed input power and an output power of each of the power supplies.
5. The method of claim 2, wherein the updated slope perturbation amount of each power supply is inversely proportional to the slope of the loss curve of each power supply.
6. The method of claim 1, wherein the slope of the loss curve of each power source is a ratio of an output power variation and a power loss variation of each power source.
7. The method for optimizing efficiency of power supplies connected in parallel according to claim 1, wherein the performing power disturbance processing on each power supply according to the slope disturbance amount and obtaining the input power and the output power after each power supply disturbance comprises:
updating the slope of the droop curve of each power supply according to the slope disturbance quantity to obtain the slope of the droop curve after each power supply is disturbed;
and according to the slope of the droop curve after each power source disturbance, performing power disturbance on each power source by adopting the droop curve control method, and acquiring the input power and the output power of each power source after disturbance.
8. The method of claim 1, wherein the initial value of the disturbance amount is a predetermined proportion of the initial slope of the droop curve.
9. The parallel power supply efficiency optimization method of claim 1, wherein the obtaining the input power and the output power of each power supply in the parallel power supply comprises:
acquiring the input current and the input voltage of each power supply in the parallel power supplies, and calculating the input power of each power supply according to the input current and the input voltage of each power supply;
and acquiring the output current and the output voltage of each power supply, and calculating the output power of each power supply according to the output current and the output voltage of each power supply.
10. A parallel power supply efficiency optimization system applied to a direct current converter is characterized by comprising:
a plurality of power supplies connected in parallel with each other;
the detection unit is electrically connected with the power supplies respectively and is used for acquiring the input power and the output power of each power supply;
the disturbance control unit is electrically connected with the power supplies respectively and is used for adjusting the power of each power supply;
a data processing unit electrically connected to the detection unit and configured to perform power disturbance processing on each power supply by using a droop curve control method according to a slope disturbance amount, receive input power and output power of each power supply before and after the power disturbance, calculate an output power variation and a power loss variation of each power supply according to the input power and the output power of each power supply before and after the power disturbance, and calculate a slope of a loss curve of each power supply according to the output power variation and the power loss variation of each power supply, where the slope disturbance amount is Δ k — b (k)loss-a)*k
Where k is the slope of the droop curve for each of the power sources, a and b are non-zero constants, klossA slope of a loss curve for each of said power supplies; and
and the main control unit is respectively electrically connected with the disturbance control unit and the data processing unit and is used for receiving the slope of the loss curve of each power supply, generating a control command according to the slope of the loss curve of each power supply and sending the control command to the disturbance control unit.
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