CN106026205A - Parallel power supply system optimization control method based on efficiency and current-sharing performance area sum maximization - Google Patents

Abstract

The invention relates to a parallel power supply system optimization control method based on efficiency and current-sharing performance area sum maximization. On the basis that an expression eta=phi(i) between efficiency eta and power supply module load currents i, an expression gamma=psi(i) between a current-sharing standard deviation reciprocal gamma and the power supply module load currents i and corresponding optimal points I<ref><1> and I<ref><2> are respectively obtained, by taking an area sum of the eta=phi(i) and the gamma=psi(i) as a target function, currents I<ref> between the I<ref><1> and the I<ref><2> are solved, and a formula shown in the descriptions is satisfied. According to the invention, the quantity of online power supply modules can be dynamically adjusted in real time, it is ensured that a parallel power supply system always works nearby a current-sharing optimal work point, under the condition that it is ensured that the efficiency and current-sharing integrated performance of the parallel power supply system is enabled to be nearby the optimal work point, i.e., the quantity of online running power supply modules is optimal, through calculating a standard difference between output currents of each power supply module and a current-sharing target value Ishare deviation, optimization scheduling is performed on the online power supply modules whose performance cannot meet requirements and backup power supply modules, the parallel power supply system and the online power supply modules both work nearby a performance optimal point.

Description

Parallel operation system optimization based on efficiency and current-sharing performance area and maximum controls Method

Technical field

The present invention relates to, based on efficiency and current-sharing performance area and maximum parallel operation system optimized control method, be used for Parallel operation system power supply module is run quantity optimization and is controlled and the Optimized Operation of power module, it is ensured that under the conditions of different loads also Efficiency and the current-sharing combination property of connection electric power system are optimum, and the method is equally applicable to other electronic equipment parallel runnings to efficiency Requirement with current-sharing (equal power) performance indications.

Background technology

High-power parallel operation power supply its be multiple power module Parallel opertation structures, due to possess compatible strong, can N+m A series of advantages such as redundancy backup, highly reliable, cost performance is high, design difficulty is relatively low, be easily managed, become solution high-power defeated One of preferred option going out Power Management Design, equal Flow Technique has become the core technology of parallel operation.All Flow Technique refer to multiple During power module parallel operation, on the premise of meeting output voltage stable state accuracy and dynamic response, there is the uniform of degree of precision Distribute each power module load current.So, the height of parallel operation system current-sharing performance is directly connected to machine system Safe and reliable and high performance operation.

Owing to parallel operation system load electric current has time variation and randomness, cause using tradition sharing control scheme (i.e. on-line operation power module quantity is constant, and the output electric current being regulated each power module by sharing control algorithm reaches equal Stream target and load coupling target scheme) parallel operation system in power module working range contain underloading, semi-load, specified The operating modes such as load and overload.On the one hand, when under different loads operating mode, parallel operation system is run, its system current-sharing performance exists one Determine difference, so that parallel operation system is optimized control, it is ensured that system all the time can under different loads current conditions Realize higher current-sharing performance；On the other hand, power module is in the case of different loads, and its work efficiency is the most different, thus needs The quantity of power module online to parallel operation system to carry out optimized control, it is ensured that each online power module works in Near high efficiency point, it is ensured that system system effectiveness under any loading condition is optimum.It is therefore desirable to a kind of new control strategy, Parallel operation system effectiveness can be realized and current-sharing composite of performance index is in higher level.

Existing parallel operation system sharing control strategy can guarantee that parallel operation system load electric current all lineman It is distributed equally as power module.But there is three below problem: one, can not realize at parallel operation system current-sharing performance In preferable state；Two, parallel operation system can not realize higher efficiency；Three, each power module runnability can not be realized Evaluate and optimize scheduling, it is impossible to guarantee that each power module current-sharing performance meets requirement.So, in order to realize parallel operation system System efficiency and current-sharing effect integrated performance index in the case of different loads are in higher, be necessary for setting up efficiency and current-sharing is comprehensive Performance Evaluating Indexes, asks for power module output current value corresponding during integrated performance index optimum.If control parallel operation System power supply module output current is near optimum output electric current, ensures that parallel operation system is in the case of different loads Efficiency and current-sharing effect integrated performance index are optimum.Meanwhile, at the optimal control online power module of parallel operation system Quantity so that parallel operation system works on the basis of near integrated performance index optimum point all the time, in addition it is also necessary to each The dynamic current equalizing performance indications of line power module are estimated and Optimized Operation, it is ensured that each module and parallel operation system are all located In optimum state, it is ensured that efficient, the reliable and long-life of parallel operation system is run.

But, find by retrieving existing paper and patent, not yet find a kind of reliable and practical parallel operation system System optimal control method realizes system effectiveness and the optimization of current-sharing integrated performance index and the optimization of each online power module Scheduling.Thus, a kind of reliable and practical parallel operation system optimized control method is just particularly important, and it is for also alliance The reliability service of electricity system has important impact.

Summary of the invention

It is an object of the invention to overcome above-mentioned weak point, it is proposed that based on efficiency and current-sharing performance area and maximum Parallel operation system optimized control method.

The technical scheme is that a kind of based on efficiency and current-sharing performance area with maximum parallel operation system optimization Control method, its step is as follows:

(1) the parallel operation system load electric current I of K power module composition is obtained_outFromAccording to being spaced apartEquidistantly change toTime, each power module is at different loads electric currentIn the case of adopt Collect V output electric current Data_curr(m') (i) (j), output voltage Data_volt(m') (i) (j) and input power P (m') (i) (j), Wherein: m' is power module sequence number；I is the sequence number value that load current value is corresponding；J is output current acquisition data sequence number；M', i, J meets m'={1 ... K}, i={1 ... U}, j={1 ... V}；I_NRated current for power module；

(2) power module output current obtaining serial number m' expects electric current with current-sharingRelative deviationMathematic expectaionAnd standard deviationObtaining K power module at current-sharing expectation electric current isTime S_m'iMeansigma methodsObtain S_iΓ reciprocal_i；The power module obtaining serial number m' at current-sharing expectation electric current isTime efficiencyWith efficiency mathematic expectaion Obtaining K power module at current-sharing expectation electric current isOperating mode under average efficiency

(3) respectively to U data pointWithCarry out process and draw Γ and power module Relation η=Φ (i) between relation Γ between load current i=Ψ (i) and efficiency eta and power module load current i；

(4) in allowing output current scope, obtain and meetMaximumAnd meetMaximum 's

(5) obtainWithBetween meetMaximum electric current I_ref,Wherein:?WithBetween；

(6) with cycle T_sFor interval calculation parallel operation system online power module quantity M, and to M online power supply mould The output electric current of block is acquired, and the output current data of the online power module of m-th sequence number is labeled as Curr (m)；

(7) obtain the output current data array of online power module of serial number m: Curr_store (m) (n)= Curr_store (m) (n+1), Curr_store (m) (T)=Curr (m)；Wherein: n=1 ... T-1；M=1,2,3 ... M；T is Positive integer more than 2；

(8) the output current average of the online power module of acquisition serial number m: Wherein: m=1,2,3 ... M；

(9) load current of the parallel operation system of M online power module composition is obtainedWith Line power module current-sharing load current

(10) judge | I_share-I_ref| whether≤σ sets up；

(11) in step (10) | I_share-I_ref|≤σ is false, then obtaining online power module output current is reference Electric current I_refTime online power module quantity N^*, i.e.

(12)N^*≤ 1 arranges N^*=2；Otherwise, then obtain parallel operation system and need to regulate online power module amount Δ N^* =N^*-M, and according to Δ N^*Positive and negative, Centralized Controller is increased or decreased | Δ N^*| individual online power module；

(13) in step (10) | I_share-I_ref|≤σ sets up, then obtain the output electricity of the online power module of serial number m Stream Curr_store (m) (n) and current-sharing desired value I_shareDeviation θ (m) (n)=Curr_store (m) (n)-I_share；Wherein: N=1 ... T；M=1,2,3 ... M；

(14) mathematic expectaion of online power module deviation θ (m) (n) of serial number m is obtainedAnd mark Quasi-deviationWherein: n=1 ... T；M=1,2,3 ... M；

(15)Continue the output electric current measure of next online power module；Otherwise, then marking serial numbers is m's Online power module current-sharing performance is undesirable, C_θFor standard deviationMaximum permissible value；

(16) by Num the undesirable online power module off-line of current-sharing performance, and from stand-by power supply, Num is started Individual online power module works, and continues the operation of step (6), wherein Num for be labeled as current-sharing performance undesirable The quantity of line power module.

In step (3), application fitting of a polynomial, curve matching, interpolating method are respectively to U data pointWithProcess.

In step (1)-step (5),

(1) t ∈ ((i-1) T, iT], (U >=i >=1), electronic load current isThen obtain power supply mould The current-sharing target reference current of block:

(2) the power module output current sampled data data of serial number m': Data is obtained_curr(m') (i) (j), (K >= M' >=1, U >=i >=1, V >=j >=1), and obtain its current-sharing relative deviation δ (m') (i) (j):

$\mathrm{\&delta;}\left(m^{\&prime;}\right)\left(i\right)\left(j\right)=\frac{{\mathrm{Data}}_{curr}\left(m^{\&prime;}\right)\left(i\right)\left(j\right)-I_{ref}\left(i\right)}{I_{ref}\left(i\right)};$

(3) power module obtaining serial number m' existsUnder the conditions of relative deviation δ (m') (i) (j) close Mathematic expectaion E in j_m'i:

(4) power module obtaining serial number m' existsUnder the conditions of relative deviation δ (m') (i) (j) close Standard deviation S in j_m'i:

S_m'iRepresent that the power module of serial number m' existsUnder the conditions of the standard deviation of relative deviation；

(5) obtaining K power module at current-sharing expectation electric current isTime mean standard deviation:

(6) S is obtained_iΓ reciprocal_i:

(7) to U data pointCarry out processing the relation drawn between Γ and power module load current i: Γ =Ψ (i)；And in allowing output current scope, obtain and meet:Load current

(8) power module obtaining serial number m' existsThe efficiency eta (m') (i) (j) of condition:

$\mathrm{\&eta;}\left(m^{\&prime;}\right)\left(i\right)\left(j\right)=\frac{{\mathrm{Data}}_{curr}\left(m^{\&prime;}\right)\left(i\right)\left(j\right)\&times;{\mathrm{Data}}_{volt}\left(m^{\&prime;}\right)\left(i\right)\left(j\right)}{P\left(m^{\&prime;}\right)\left(i\right)\left(j\right)}\&times;100\%;$

(9) power module obtaining serial number m' existsUnder the conditions of η (m') (i) (j) about the mathematics of j Expect η_m'i:

${\mathrm{\&eta;}}_{m^{\&prime;}i}=\frac{1}{V}\underset{j=1}{\overset{V}{\&Sigma;}}\mathrm{\&eta;}\left(m^{\&prime;}\right)\left(i\right)\left(j\right),$

η_m'iRepresent that the power module of serial number m' existsUnder the conditions of the meansigma methods of efficiency；

(10) obtaining K power module at current-sharing expectation electric current isOperating mode under average efficiency:

(11) are to U data pointCarry out processing the pass drawn between efficiency eta and power module load current i System: η=Φ (i), in allowing output current scope, obtains and meets:Load current

(12), with the area of η=Φ (i) and Γ=Ψ (i) with as object function, obtain and meet:

Optimal load electric current I_ref,

Wherein: I_refIt is inWithBetween,It is inWithBetween.

The principle of the present invention mainly comprises with lower part: first, obtain parallel operation system power supply module average efficiency η with Expression formula η=the Φ (i) of power module load current i, and ask for load current corresponding during Φ (i) maximumSecondly, obtain Take the expression formula Γ=Ψ between parallel operation system power supply module mean standard deviation inverse Γ and power module load current i (i), and ask for load current corresponding during Ψ (i) maximumAgain, existWithBetween ask for optimal current I_refMeet Area andMaximum；Then, the load current I that parallel operation system is total is obtained in real time_out And ask for optimum on-line operation power module quantityControl online power module quantity be equal to or approach N*, it is ensured that System works near current-sharing performance optimum point all the time；Finally, obtain each power module output current data of on-line operation, Draw the standard deviation of output current data and target equal flow valuve deviation, thus whether differentiate the power module of each on-line operation Meet and require and carry out optimal dispatch control.Owing to its characteristic of power module of same size totally keeps consistent, thereby through Measure the parallel operation system of K (the big I of K is determined, it is 10 that K of the present invention fixes tentatively) individual power module composition by user in difference Current-sharing performance indications under load current can obtain the parallel operation system of any N number of power module composition in different loads feelings Current-sharing performance indications under condition.Then, the output electric current of each power module run and the mark of target equal flow valuve deviation are obtained Quasi-deviation.On the premise of ensureing power module quantity optimum, the inclined extent of establishing criteria is scheduling running power module Control, it is ensured that the performance of the power module of each operation meets requirement.

Present invention have the advantage that

(1) present invention covers load current full operating range operating mode, there is wide applicability；

(2) present invention can comprehensively take into account parallel operation system effectiveness and current-sharing performance indications, have significant economy and System reliability；

(3) present invention is in the expression formula η=Φ (i) obtained respectively between efficiency eta and power module load current i and current-sharing Expression formula Γ=Ψ (i) between standard deviation inverse Γ with power module load current i and corresponding optimum pointWithBase On plinth.With the area of η=Φ (i) and Γ=Ψ (i) with as object function, ask forWithBetween electric current I_refSo thatWherein:?WithBetween.This value characterizes During parallel operation system current-sharing efficiency and current-sharing integrated performance index optimum and corresponding at wire module load current value, Foundation is provided for parallel operation system effectiveness and current-sharing optimal control.

(4) present invention has the Real-time and Dynamic online power module quantity of adjustment, it is ensured that parallel operation system works in all the time Near current-sharing optimal working point.

(5) present invention is guaranteeing that parallel operation system effectiveness and current-sharing combination property are in the target near optimal working point It is down that on-line operation power module quantity is optimum, by calculating output electric current and current-sharing desired value I of each power module_sharePartially The standard deviation of difference, the online power module being unsatisfactory for performance requiring is optimized scheduling with standby power supply module, it is achieved in parallel Electric power system and online power module all work near best performance point；

(6) of the present invention based on efficiency and current-sharing performance area with maximum parallel operation system optimized control method There is reliability high, the feature such as practical；Can effectively take into account parallel operation system current-sharing performance and efficiency index, improve system Performance driving economy and reliability, for parallel operation security of system, Effec-tive Function provide Reliable guarantee.

Accompanying drawing explanation

Fig. 1 is parallel operation system construction drawing.

Fig. 2 is parallel operation system effectiveness and current-sharing comprehensive performance testing system structure chart.

Fig. 3 is efficiency and current-sharing combination property area and schematic diagram.

Detailed description of the invention

Below for accompanying drawing, embodiments of the invention are described further:

The invention provides based on efficiency and current-sharing performance area and maximum parallel operation system optimized control method.Figure 1 show parallel operation system construction drawing, and Fig. 2 show parallel operation system effectiveness and current-sharing comprehensive performance testing system structure Figure, Fig. 3 is efficiency and current-sharing combination property area and schematic diagram.Fig. 1 mainly includes parallel operation system Centralized Controller, power supply Module and use electric loading.Centralized Controller at the IP of wire module and exports electric current by communication bus acquisition, and optimal control exists The quantity of line power module and the underproof power module of Optimized Operation performance；Power module mainly realizes powering to the load, connecing Collect the operation control command of middle controller and upload output electric current；All kinds of electrical equipment is mainly comprised by electric loading.Current-sharing is adjusted The realization of joint function with or without communication bus autonomous equalizing current mode and has the equal stream mode of communication bus, by special flow equalizing function module Realizing, the present invention does not repeats.Fig. 2 major function is the functional relationship η=Φ obtaining parallel operation system effectiveness with load current (i) and the module current-sharing standard deviation mathematical relationship Γ=Ψ (i) with load current reciprocal, and determine respective optimal load electricity StreamWithOn this basis, with the area of η=Φ (i) and Γ=Ψ (i) with as object function, ask forWithBetween Electric current I_refSo thatSo that it is determined that efficiency and current-sharing Load current I during combination property optimum_ref.Fig. 2 mainly includes host computer (PC), program-control electronic load, power module, merit Rate meter etc..Host computer (PC) major function is for obtaining online module I P address, input power, module output current, output work Rate, control program-control electronic load operating current, calculating Γ=Ψ (i), η=Φ (i) and optimal load electric current I_ref；Program-controlled electronic Load is for regulating the load current of parallel operation system；Power module mainly realizes receiving IP and sets, receives host computer order Data export electric current, output to host computer with uploading；Energy meter is mainly used in measuring the input power at wire module.Fig. 3 For being inWithBetween load current I_refSo that efficiency and current-sharing combination property area and maximum schematic diagram.

One, parallel operation system effectiveness and current-sharing comprehensive performance testing system variable declaration are as follows: K is that parallel operation test is System power module quantity, the occurrence of K can set according to practical situation.I_NFor power module rated current；For parallel operation system System output-current rating, meetsU is load current point quantity, i.e. parallel operation system load electric current I_outFromAccording to being spaced apartEquidistantly change to(contain underloading, semi-load, specified load and overload conditions, U It is necessary for the positive integer not less than 20, user can determine according to the maximum load current value of system work)；For Electronic load exports electric current at i-th, wherein: U >=i >=1；M' is power module sequence number, meets: the IP of K power module presses It is mapped as m'=1 according to order from small to large, 2 ... K, i.e. m'=1 are the power module sequence number that IP is minimum, and m'=2 is IP minimum Power module sequence number ..., m'=K is the power module sequence number that IP is maximum by that analogy；V is that parallel operation system is in a certain load Need to be to when single online power module output current, output voltage and input power data sampling quantity during current point, V can be according to reality Border needs to be sized.Data_currM () (i) (j), (K >=m >=1, U >=i >=1, V >=j >=1) is that the power module of serial number m' existsUnder the conditions of jth current sampling data；Data_volt(m') (i) (j), (K >=m' >=1, U >=i >=1, V >=j >=1) Power module for serial number m' existsUnder the conditions of jth output voltage sampled data；P (m') (i) (j), (K >=m' >=1, U >=i >=1, V >=j >=1) it is that the power module of serial number m' existsUnder the conditions of jth input power hits According to；η (m') (i) (j), (K >=m' >=1, U >=i >=1, V >=j >=1) is that the power module of serial number m' existsCondition Under the jth efficiency data calculated, meet: η_m'iPower module for serial number m' existsUnder the conditions of the mathematic expectaion of V η (m') (i) (j), meet:I_refI () is that power module existsUnder the conditions of current-sharing target reference, meet:Wherein: U >=i >=1；η_iFor K power module at current-sharing expectation electric current it isOperating mode under Average efficiency, meets:δ (m') (i) (j) is that the power module of serial number m' existsUnder the conditions of Jth sample rate current and current-sharing reference target electric currentRelative standard deviation values, meet:E_m'_iPower module for serial number m' existsUnder the conditions of V δ (m') mathematic expectaion of (i) (j), meets:S_m'iPower module for serial number m' existsUnder the conditions of the standard deviation of V δ (m') (i) (j), meet:S_iFor K power module standard deviation meansigma methods, meetsΓ_iFor S_iInverse, meet:

Definition t=0 is the last moment of parallel operation system no-load running；T is adjacent two load current interval times； Then t ∈ ((i-1) T, iT], (U >=i >=1) is parallel operation system load electric currentThe operation time.Due toRunning needs each power module is gathered 3V sample data, thus, host computer need to gather 3 altogether × K × V data.The time assuming one data of host computer collection is T₁, then system works inState needs T_total=3 × K × V × T₁Time, thus it must is fulfilled for T >=T_total.Again due to current-sharing performance data reliability and sampling number With sampling time T₁Relevant, thus T and T need to be considered according to the actual requirements₁Size, it is ensured that the reliability of current-sharing performance indications.

First, from controlling engineering knowledge, evaluate the overshoot that the performance of system can be responded by system step, adjust Time and steady-state deviation index are weighed.Thus, parallel operation system electronic load byStep isTime, we again may be by measuring the electric current of power module and export between current-sharing target reference Dynamic response evaluates the current-sharing performance of power module.From mathematical statistics knowledge, parallel system current-sharing standard deviation characterizes Be system current-sharing dynamic response process relative overshoot size, embody the collection of output electric current during its current-sharing step response Moderate, can reflect power module current-sharing performance indications；Secondly, parallel operation system, should while meeting current-sharing performance indications This takes into account the economic benefit that system is run；Finally, by ask for expression formula η between efficiency eta and power module load current i= Expression formula Γ=Ψ (i) and corresponding optimum thereof between Φ (i) and standard deviation inverse Γ with power module load current i are born Carry electric currentWithOn the basis of, with the area of η=Φ (i) and Γ=Ψ (i) with as object function, ask forWithBetween Electric current I_refSo thatSo that it is determined that efficiency and current-sharing Load current I during combination property optimum_ref, its physical significance shows that parallel operation system is in efficiency under which kind of load current Best with current-sharing combination property.

T ∈ ((i-1) T, iT], (U >=i >=1), electronic load current isThe then current-sharing of power module Target reference current is:

$I_{ref}\left(i\right)=\frac{\frac{i}{20}{I}_N^p}{K}=\frac{i}{20}{I}_N,U\&GreaterEqual;i\&GreaterEqual;1,---\left(1\right)$

Obtain the power module output current sampled data data of serial number m': Data_curr(m') (i) (j), (K >=m' >= 1, U >=i >=1, V >=j >=1), thus, its current-sharing relative deviation δ (m') (i) (j) is:

$\mathrm{\&delta;}\left(m^{\&prime;}\right)\left(i\right)\left(j\right)=\frac{{\mathrm{Data}}_{curr}\left(m^{\&prime;}\right)\left(i\right)\left(j\right)-I_{ref}\left(i\right)}{I_{ref}\left(i\right)},---\left(2\right)$

The power module asking for serial number m' existsUnder the conditions of relative deviation δ (m') (i) (j) about the number of j Term hopes E_m'iFor:

$E_{m^{\&prime;}i}=\frac{1}{V}\underset{j=1}{\overset{V}{\&Sigma;}}\mathrm{\&delta;}\left(m^{\&prime;}\right)\left(i\right)\left(j\right),---\left(3\right)$

The power module asking for serial number m' existsUnder the conditions of relative deviation δ (m') (i) (j) about the mark of j Quasi-deviation S_m'iFor:

$S_{m^{\&prime;}i}=\sqrt{\frac{1}{V-1}\underset{j=1}{\overset{V}{\&Sigma;}}{\left(\mathrm{\&delta;}\right(m^{\&prime;}\left)\right(i\left)\right(j)-E_{m^{\&prime;}i})}^2},---\left(4\right)$

S_m'iPhysical significance be: the power module of serial number m' existsUnder the conditions of the standard of relative deviation Deviation, S_m'iThe least show power moduleUnder the conditions of current-sharing concentration degree performance the best.

Calculating K power module at current-sharing expectation electric current isTime mean standard deviation:

$S_i=\frac{1}{K}\underset{m^{\&prime;}=1}{\overset{K}{\&Sigma;}}{S}_{m^{\&prime;}i},---\left(5\right)$

Calculate S_iΓ reciprocal_i, meet:

${\mathrm{\&Gamma;}}_i=\frac{1}{S_i},---\left(6\right)$

Γ_iPhysical significance be: Γ_iShow the most greatly power moduleUnder the conditions of current-sharing concentration degree performance The best.

Application Related Computational Methods (such as fitting of a polynomial, curve matching, interpolating method etc.) is to U data pointCarry out processing the expression formula drawn between Γ and power module load current i:

Γ=Ψ (i), (7)

In allowing output current scope, solve load currentMeet:

$\mathrm{\&Psi;}\left(I_{ref}^2\right)\&GreaterEqual;\mathrm{\&Psi;}\left(i\right),---\left(8\right)$

The power module asking for serial number m' existsCondition efficiency eta (m') (i) (j) is:

$\mathrm{\&eta;}\left(m^{\&prime;}\right)\left(i\right)\left(j\right)=\frac{{\mathrm{Data}}_{curr}\left(m^{\&prime;}\right)\left(i\right)\left(j\right)\&times;{\mathrm{Data}}_{volt}\left(m^{\&prime;}\right)\left(i\right)\left(j\right)}{P\left(m^{\&prime;}\right)\left(i\right)\left(j\right)}\&times;100\%,---\left(9\right)$

The power module asking for serial number m' existsUnder the conditions of η (m') (i) (j) about the mathematic expectaion of j η_m'iFor:

${\mathrm{\&eta;}}_{m^{\&prime;}i}=\frac{1}{V}\underset{j=1}{\overset{V}{\&Sigma;}}\mathrm{\&eta;}\left(m^{\&prime;}\right)\left(i\right)\left(j\right),---\left(10\right)$

η_m'iPhysical significance be: the power module of serial number m' existsUnder the conditions of the meansigma methods of efficiency, η_m'iShow the most greatly power moduleUnder the conditions of economic performance the best, the most energy-conservation；

Calculating K power module at current-sharing expectation electric current isOperating mode under average efficiency:

${\mathrm{\&eta;}}_i=\frac{1}{K}\underset{m^{\&prime;}=1}{\overset{K}{\&Sigma;}}{\mathrm{\&eta;}}_{m^{\&prime;}i},---\left(11\right)$

Application Related Computational Methods (such as fitting of a polynomial, curve matching, interpolating method etc.) is to U data pointCarry out processing the expression formula drawn between efficiency eta and power module load current i:

η=Φ (i), (12)

In allowing output current scope, solve load currentMeet:

$\mathrm{\&Phi;}\left(I_{ref}^1\right)\&GreaterEqual;\mathrm{\&Phi;}\left(i\right),---\left(13\right)$

With the area of η=Φ (i) and Γ=Ψ (i) with as object function, calculate optimal load electric current I_ref, meet:

$\left(\right|{\&Integral;}_{I_{ref}^1}^{I_{ref}}\mathrm{\&Phi;}\left(i\right)di|+|{\&Integral;}_{I_{ref}}^{I_{ref}^2}\mathrm{\&Psi;}\left(i\right)di|)\&GreaterEqual;(\left|{\&Integral;}_{I_{ref}^1}^i\mathrm{\&Phi;}\right(i\left)di\right|+\left|{\&Integral;}_i^{I_{ref}^2}\mathrm{\&Psi;}\right(i\left)di\right|),---\left(14\right)$

Wherein: I_refIt is inWithBetween,It is inWithBetween；

I_refPhysical significance be: the parallel operation system effectiveness being made up of K power module and current-sharing combination property are optimum Time load current:

Two, parallel operation system optimization control structure figure variable is described as follows:

T_sCalculate online power module quantity for Centralized Controller and gather the cycle of power module output current data；M For online power module quantity；I_outLoad current for parallel operation system；Curr (m) is the online power module of serial number m Output current sampling data, m=1,2, ┄, M；I_refFor the most electric when parallel operation system effectiveness and current-sharing combination property optimum The load current that source module is corresponding；I_shareOnline power module output current current-sharing desired value when running for parallel operation system； Δ I is I_shareWith I_refThe absolute value of difference；σ is I_shareWith I_refThe maximum permissible value of difference absolute value.Curr_store(m) N () is the output electric current storage array of the online power module of serial number m, m=1,2, ┄, M；N=1,2, ┄, T；M is current The sequence number of online power module, n is the current sample number of times of same online power module, and T is the positive integer more than 2,Output electric current for the online power module of serial number m stores the meansigma methods of array Curr_store (m) (n)；θ(m) N () is Curr_store (m) (n) and current-sharing desired value I of the online power module of serial number m_shareDeviation:For θ (m) The mathematic expectaion of (n)；Standard deviation for θ (m) (n)；C_θForMaximum permissible value；

At t=KT_s, K=0,1,2,3 ... in the moment, parallel operation system Centralized Controller starts to gather by communication bus Output electric current Curr (m) of M online power module, m=1,2, ┄, M；

The output current data of the online power module of renewal serial number m:

Curr_store (m) (n)=Curr_store (m) (n+1), (14)

Curr_store (m) (T)=Curr (m), (15)

Wherein: m=1,2, ┄, M, n=1,2, ┄, T-1；

The online power module output current meansigma methods of calculating serial number m:

$\stackrel{\&OverBar;}{Curr\left(m\right)}=\frac{1}{T}\underset{n=1}{\overset{T}{\&Sigma;}}Curr\_store\left(m\right)\left(n\right),---\left(16\right)$

Wherein: m=1,2,3 ... M；

Calculate parallel operation system load electric current I_out, meet:

$I_{out}=\underset{m=1}{\overset{M}{\&Sigma;}}\stackrel{\&OverBar;}{Curr\left(m\right)},---\left(17\right)$

Calculate online power module output current desired value I_share, meet:

$I_{share}=\frac{I_{out}}{M},---\left(18\right)$

Calculate online power module output current storage data Curr_store (m) (n) and the current-sharing desired value of serial number m I_shareDeviation:

θ (m) (n)=Curr_store (m) (n)-I_share, (19)

Wherein: n=1 ... T；M=1,2,3 ... M；

Calculate the mathematic expectaion of online power module deviation θ (m) (n) of serial number m；

$E_{\mathrm{\&theta;}}^m=\frac{1}{T}\underset{n=1}{\overset{T}{\&Sigma;}}\mathrm{\&theta;}\left(m\right)\left(n\right),---\left(20\right)$

Wherein: n=1 ... T；M=1,2,3 ... M；

Calculate the standard deviation of online power module deviation θ (m) (n) of serial number m；

$S_{\mathrm{\&theta;}}^m=\sqrt{\frac{1}{T-1}\underset{n=1}{\overset{T}{\&Sigma;}}{\left(\mathrm{\&theta;}\right(m\left)\right(n)-E_{\mathrm{\&theta;}}^m)}^2},---\left(21\right)$

Wherein: n=1 ... T；M=1,2,3 ... M；

Calculate online power module output current desired value I_shareWith I_refAbsolute value delta I of difference, meet:

Δ I=| I_share-I_ref|, (22)

Judge whether Δ I meets inequality:

Δ I ＜ σ, (23)

In the case of inequality (23) meets, it is judged that the output electric current of the online power module of serial number m and current-sharing mesh Whether the standard deviation of scale value deviation meets inequality:

$\left|S_{\mathrm{\&theta;}}^m\right|\&le;C_{\mathrm{\&theta;}},---\left(24\right)$

If the online power module of serial number m meets inequality (24), illustrate that online power module performance is qualified；No Then, online power module performance is defective, needs to cut the work of qualified power module from spare module.

In the case of inequality (23) is ungratified, calculating parallel operation system load electric current is I_outTime, efficiency and current-sharing Online power module quantity N under combination property optimal conditions^*, meet:

$N^{*}=\&lsqb;\frac{I_{out}}{I_{ref}}\&rsqb;,---\left(25\right)$

In the case of inequality (23) is ungratified, calculate parallel operation system online power module regulated quantity Δ N^*, full Foot:

ΔN^*=N^*-M, (26)

Centralized Controller increases (minimizing) | Δ N^*| individual online power module, it is ensured that parallel operation system effectiveness and current-sharing are combined Close best performance.

The invention provides based on efficiency and current-sharing performance area and maximum parallel operation system optimized control method, bag Include following steps:

(1) the parallel operation system load electric current I of K power module composition is obtained in advance_outFromAccording to interval ForEquidistantly change toTime (for meet contain underloading, semi-load, specified load and overload conditions, U is necessary for Positive integer not less than 20；I_NRated current for power module), each power module is at different loads electric currentIn the case of gather V export electric current Data_curr(m') (i) (j), output voltage Data_volt(m') (i) (j) and Input power P (m') (i) (j) (V can be determined size by user according to actual).Wherein: m' is power module sequence number；I is load The sequence number value that current value is corresponding；J is output current acquisition data sequence number；M', i, j meet m'={1 ... K}, i={1 ... U}, j =1 ... V}；

(2) power module output current calculating serial number m' expects electric current with current-sharingRelative deviationMathematic expectaionAnd standard deviationS_m'iThe least show that the current-sharing concentration degree performance of module is the best；Calculate K power supply mould Block at current-sharing expectation electric current isTime S_m'iMeansigma methodsCalculate S_iΓ reciprocal_i, Γ_iShow the most greatly module Average current-sharing concentration degree performance is the best；The power module calculating serial number m' at current-sharing expectation electric current isTime efficiencyWith efficiency mathematic expectaion η_m'iShow that the most greatly the efficiency of module is the highest；Calculating K power module at current-sharing expectation electric current isOperating mode under averagely imitate Rate

(3) application Related Computational Methods (such as fitting of a polynomial, curve matching, interpolating method etc.) is respectively to U data PointWithCarry out processing expression formula Γ that draws between Γ and power module load current i= Expression formula η=Φ (i) between Ψ (i) and efficiency eta and power module load current i；

(4) in allowing output current scope, solveMeetMaximum andMeet? Greatly；

(5) ask forWithBetween electric current I_ref, meetIt is maximum, it may be assumed thatWherein:?WithBetween；

(6) with cycle T_sFor interval calculation parallel operation system online power module quantity M, and to M online power supply mould The output electric current of block is acquired, and the output current data of the online power module of first sequence number is labeled as Curr (1), when Front online power module serial number m, makes m=1；

(7) the output current data array of the online power module of serial number m is updated, it may be assumed that Curr_store (m) (n)= Curr_store (m) (n+1), Curr_store (m) (T)=Curr (m)；Wherein: n=1 ... T-1；M=1,2,3 ... M；T is Positive integer more than 2；

(8) the output current average of the online power module of calculating serial number m: Wherein: m=1,2,3 ... M；

(9) load current of the parallel operation system of M online power module composition is calculatedWith Line power module current-sharing load current

(10) judge | I_share-I_ref| whether≤σ sets up？If it is, enter step (18)；Otherwise, then step is entered (11)；

(11) calculating online power module output current is reference current I_refTime online power module quantity N^*, i.e.

(12) N is judged^*≤1？Whether set up？If it is, enter step (13)；Otherwise, enter step (14)；

(13) N is set^*=2；This is due to N^*< it is single supply module for power supply when 2, does not possess flow equalizing function；

(14) calculate parallel operation system and need to regulate power module amount Δ N^*=N^*-M；

(15) Δ N is judged^*＞ 0？Whether set up？If it is, enter step (16)；Otherwise, enter step (17)；

(16) Centralized Controller increases Δ N^*Individual online power module, subsequently into step (6)；

(17) Centralized Controller reduces Δ N^*Individual online power module, subsequently into step (6)；

(18) output electric current Curr_store (m) (n) and the current-sharing desired value of the online power module of serial number m are calculated I_shareDeviation θ (m) (n)=Curr_store (m) (n)-I_share；Wherein: n=1 ... T；M=1,2,3 ... M；

(19) mathematic expectaion of online power module deviation θ (m) (n) of serial number m is calculatedWith Standard deviationWherein: n=1 ... T；M=1,2,3 ... M；

(20) m=1 is initialized；

(21) defective online power module quantity Num=0 is initialized；

(22) judge(C_θFor standard deviationMaximum permissible value) if it is, enter step (25)；Otherwise, enter Enter step (23)；

(23) marking serial numbers is that the online power module current-sharing performance of m is undesirable；

(24) more new variables Num=Num+1；

(25) m=m+1 is updated；

(26) m≤M is judged？If it is, enter step (22)；Otherwise, step (27) is entered；

(27) by Num the undesirable online power module off-line of current-sharing performance, and from stand-by power supply, Num is started Individual power module works；Subsequently into step (6).

Embodiment is not construed as the restriction invented, but any spiritual improvements introduced based on the present invention, all Ying Ben Within the protection domain of invention.

Claims (3)

1. one kind based on efficiency and current-sharing performance area and maximum parallel operation system optimized control method, it is characterised in that: Its step is as follows:

(1) the parallel operation system load electric current I of K power module composition is obtained_outFromAccording to being spaced apartEquidistantly change toTime, each power module is at different loads electric currentIn the case of adopt Collect V output electric current Data_curr(m') (i) (j), output voltage Data_volt(m') (i) (j) and input power P (m') (i) (j), Wherein: m' is power module sequence number；I is the sequence number value that load current value is corresponding；J is output current acquisition data sequence number；M', i, J meets m'={1 ... K}, i={1 ... U}, j={1 ... V}；I_NRated current for power module；

(2) power module output current obtaining serial number m' expects electric current with current-sharingRelative deviationMathematic expectaionAnd standard deviationObtaining K power module at current-sharing expectation electric current isTime S_m'iMeansigma methodsObtain S_iΓ reciprocal_i；The power module obtaining serial number m' at current-sharing expectation electric current isTime efficiencyWith efficiency mathematic expectaion Obtaining K power module at current-sharing expectation electric current isOperating mode under average efficiency

(3) respectively to U data pointWithCarry out process and show that Γ loads with power module Relation η=Φ (i) between relation Γ between electric current i=Ψ (i) and efficiency eta and power module load current i；

(4) in allowing output current scope, obtain and meetMaximumAnd meetMaximum

(5) obtainWithBetween meetMaximum electric current I_ref,Wherein:?WithBetween；

(6) with cycle T_sFor interval calculation parallel operation system online power module quantity M, and defeated to M online power module Go out electric current to be acquired, the output current data of the online power module of m-th sequence number is labeled as Curr (m)；

(7) the output current data array of the online power module of acquisition serial number m: Curr_store (m) (n)=Curr_ Store (m) (n+1), Curr_store (m) (T)=Curr (m)；Wherein: n=1 ... T-1；M=1,2,3 ... M；T is more than 2 Positive integer；

(8) the output current average of the online power module of acquisition serial number m: Wherein: m=1,2,3 ... M；

(9) load current of the parallel operation system of M online power module composition is obtainedWith online power supply Module current-sharing load current

(10) judge | I_share-I_ref| whether≤σ sets up；

(11) in step (10) | I_share-I_ref|≤σ is false, then obtaining online power module output current is reference current I_refTime online power module quantity N^*, i.e.

(12)N^*≤ 1 arranges N^*=2；Otherwise, then obtain parallel operation system and need to regulate online power module amount Δ N^*=N^*- M, and according to Δ N^*Positive and negative, Centralized Controller is increased or decreased | Δ N^*| individual online power module；

(13) in step (10) | I_share-I_ref|≤σ sets up, then obtain the output electric current of the online power module of serial number m Curr_store (m) (n) and current-sharing desired value I_shareDeviation θ (m) (n)=Curr_store (m) (n)-I_share；Wherein: n =1 ... T；M=1,2,3 ... M；

(14) mathematic expectaion of online power module deviation θ (m) (n) of serial number m is obtainedAnd standard deviation DifferenceWherein: n=1 ... T；M=1,2,3 ... M；

(15)Continue the output electric current measure of next online power module；Otherwise, then marking serial numbers is the online of m Power module current-sharing performance is undesirable, C_θFor standard deviationMaximum permissible value；

(16) by Num the undesirable online power module off-line of current-sharing performance, and startup Num exists from stand-by power supply Line power module works, and continues the operation of step (6), and wherein Num is for being labeled as the undesirable online electricity of current-sharing performance The quantity of source module.

The most according to claim 1 based on efficiency and current-sharing performance area with maximum parallel operation system optimization controlling party Method, it is characterised in that: in step (3), application fitting of a polynomial, curve matching, interpolating method are respectively to U data pointWithProcess.

The most according to claim 1 based on efficiency and current-sharing performance area with maximum parallel operation system optimization controlling party Method, it is characterised in that: in step (1)-step (5),

(1) t ∈ ((i-1) T, iT], (U >=i >=1), electronic load current isThen obtain power module Current-sharing target reference current:

(2) the power module output current sampled data data of serial number m': Data is obtained_curr(m') (i) (j), (K >=m' >= 1, U >=i >=1, V >=j >=1), and obtain its current-sharing relative deviation δ (m') (i) (j):

$\mathrm{\&delta;}\left(m^{\&prime;}\right)\left(i\right)\left(j\right)=\frac{{\mathrm{Data}}_{\mathrm{curr}}\left(m^{\&prime;}\right)\left(i\right)\left(j\right)-I_{\mathrm{ref}}\left(i\right)}{I_{\mathrm{ref}}\left(i\right)};$

(3) power module obtaining serial number m' existsUnder the conditions of relative deviation δ (m') (i) (j) about j's Mathematic expectaion E_m'i:

(4) power module obtaining serial number m' existsUnder the conditions of relative deviation δ (m') (i) (j) about j's Standard deviation S_m'i:

S_m'iRepresent that the power module of serial number m' existsUnder the conditions of the standard deviation of relative deviation；

(5) obtaining K power module at current-sharing expectation electric current isTime mean standard deviation:

(6) S is obtained_iΓ reciprocal_i:

(7) to U data pointCarry out processing the relation drawn between Γ and power module load current i: Γ=Ψ (i)；And in allowing output current scope, obtain and meet:Load current

(8) power module obtaining serial number m' existsThe efficiency eta (m') (i) (j) of condition:

$\mathrm{\&eta;}\left(m^{\&prime;}\right)\left(i\right)\left(j\right)=\frac{{\mathrm{Data}}_{\mathrm{curr}}\left(m^{\&prime;}\right)\left(i\right)\left(j\right)\&times;{\mathrm{Data}}_{\mathrm{volt}}\left(m^{\&prime;}\right)\left(i\right)\left(j\right)}{P\left(m^{\&prime;}\right)\left(i\right)\left(j\right)}\&times;100\%;$

(9) power module obtaining serial number m' existsUnder the conditions of η (m') (i) (j) about mathematic expectaion η of j_m'i:

${\mathrm{\&eta;}}_{m^{\&prime;}i}=\frac{1}{V}\underset{j=1}{\overset{V}{\mathrm{\&Sigma;}}}\mathrm{\&eta;}\left(m^{\&prime;}\right)\left(i\right)\left(j\right),$

η_m'iRepresent that the power module of serial number m' existsUnder the conditions of the meansigma methods of efficiency；

(10) obtaining K power module at current-sharing expectation electric current isOperating mode under average efficiency:

(11) are to U data pointCarry out processing the relation drawn between efficiency eta and power module load current i: η =Φ (i), in allowing output current scope, obtains and meets:Load current

(12), with the area of η=Φ (i) and Γ=Ψ (i) with as object function, obtain and meet:

Optimal load electric current I_ref,

Wherein: I_refIt is inWithBetween,It is inWithBetween.