CN106127609A - Based on efficiency and current-sharing index area and maximum parallel operation system module number controlling method - Google Patents

Abstract

The present invention relates to based on efficiency and current-sharing index area and maximum parallel operation system module number controlling method, present invention expression formula θ=Ψ (i) between the expression formula η=Φ (i) obtained respectively between efficiency eta with power module load current i and current-sharing relative deviation mathematic expectaion inverse θ and power module load current i and corresponding optimum pointWithOn the basis of.With the area of η=Φ (i) and θ=Ψ (i) with as object function, ask forWithBetween electric current I_refSo thatThe present invention has Real-time and Dynamic and adjusts online power module quantity, it is ensured that parallel operation system works near current-sharing optimal working point all the time.There is reliability high, the feature such as practical；Can effectively take into account parallel operation system current-sharing performance and efficiency index, improve performance driving economy and the reliability of system, provide Reliable guarantee for parallel operation security of system, Effec-tive Function.

Description

Based on efficiency and current-sharing index area and maximum parallel operation system module quantity control Method processed

Technical field

The present invention relates to based on efficiency and current-sharing index area and maximum parallel operation system module number controlling method, Run quantity optimization for parallel operation system power supply module to control, it is ensured that the efficiency of parallel operation system under the conditions of different loads Optimum with current-sharing combination property, the method is equally applicable to other electronic equipment parallel runnings to efficiency and current-sharing (equal power) property The requirement of energy index.

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 aggregative indicator 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 following two problem: one, can not realize at parallel operation system current-sharing performance In preferable state；Two, parallel operation system can not realize higher efficiency.So, in order to realize parallel operation system in difference Under loading condition, efficiency and current-sharing effect aggregative indicator are in higher, are necessary for setting up efficiency and current-sharing comprehensive evaluation index, ask Take power module output current value corresponding during integrated performance index optimum.As long as controlling the output of parallel operation system power supply module Electric current is near optimum output electric current, ensures that parallel operation system efficiency and current-sharing effect in the case of different loads are combined Close performance indications optimum and parallel operation system efficient, the reliable and long-life to run.

But, find by retrieving existing paper and patent, not yet find a kind of reliable and practical parallel operation system System module number control method realizes system effectiveness and the optimization of current-sharing integrated performance index.Thus, a kind of reliable and practical Parallel operation system module number controlling method be just particularly important, it has for the reliability service of parallel operation system 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 index area and maximum Parallel operation system module number controlling method.

The technical scheme is that a kind of based on efficiency and current-sharing index area with maximum parallel operation system module Number controlling 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 deviationAnd mathematic expectaionObtain K power module to exist Current-sharing expectation electric current isTime E_m'iMeansigma methodsObtain E_iθ reciprocal_i；Obtain the power supply of serial number m' Module at current-sharing expectation electric current isTime efficiencyWith Efficiency mathematic expectaionObtaining K power module at current-sharing expectation electric current isOperating mode under flat All efficiency

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

(4) in allowing output current scope, it is thus achieved that 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), its Middle m is the sequence number of current online power module；

(7) load current of the parallel operation system of M online power module composition is obtainedAnd electricity Source module current-sharing load current

(8)|I_share-I_ref|≤σ sets up the operation then continuing step (6)；Otherwise obtain online power module output current For reference current I_refTime online power module quantity N^*,

(9)N^*≤ 1 arranges N^*=2；Otherwise then obtain parallel operation system and need to regulate online power module amount Δ N^*= N^*-M；According to Δ N^*Positive and negative, Centralized Controller is increased or decreased | Δ N^*| individual online 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 acquisition serial number m':

Data_curr(m') (i) (j), (K >=m' >=1, U >=i >=1, V >=j >=1), and obtain its current-sharing relative deviation δ (m') (i) (j):

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

(3) power module obtaining serial number m' existsUnder the conditions of relative deviation δ (m') (i) (j) about j Mathematic expectaion absolute value E_m'i:E_m'iRepresent that the power module of serial number m' existsUnder the conditions of the mathematic expectaion of relative deviation；

(4) obtaining K power module at current-sharing expectation electric current isTime average expectation:

(5) E is obtained_iθ reciprocal_i:

(6) to U data pointCarry out processing the relation drawn between θ and power module load current i: θ= Ψ (i), and in allowing output current scope, it is thus achieved that meetLoad current

(7) power module obtaining serial number m existsCondition efficiency eta (m') (i) (j):

$\mathrm{\η}\left(m^{\′}\right)\left(i\right)\left(j\right)=\frac{{\mathrm{Data}}_{curr}\left(m^{\′}\right)\left(i\right)\left(j\right)\×{\mathrm{Data}}_{volt}\left(m^{\′}\right)\left(i\right)\left(j\right)}{P\left(m^{\′}\right)\left(i\right)\left(j\right)}\×100\%;$

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

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

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

(10) to U data pointCarry out processing the pass drawn between efficiency eta and power module load current i System: η=Φ (i), and in allowing output current scope, it is thus achieved that meetLoad current

(11) with the area of η=Φ (i) and θ=Ψ (i) with as object function,

Obtain and meetOptimal 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 expression formula θ between parallel operation system power supply module average current-sharing deviation expectation θ and power module load current i reciprocal= Ψ (i), and ask for load current corresponding during Ψ (i) maximumAgain, existWithBetween ask for optimal current I_refMeet Area and maximumFinally, 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.Owing to its characteristic of power module of same size totally keeps consistent, because of And by measuring 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 Current-sharing performance indications under different loads electric current can obtain the parallel operation system of any N number of power module composition in difference Current-sharing performance indications under loading condition.

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 θ=Ψ (i) between relative deviation mathematic expectaion inverse θ and power module load current i and corresponding optimum pointWithOn the basis of.With the area of η=Φ (i) and θ=Ψ (i) with as object function, ask forWithBetween electric current I_ref, MakeWherein:?WithBetween.This value table Levied efficiency and current-sharing integrated performance index during parallel operation system current-sharing optimum and corresponding at wire module load electricity Flow valuve, provides foundation 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) parallel operation system module quantity based on efficiency and current-sharing index area and maximum of the present invention controls The features such as it is high that method has reliability, practical；Can effectively take into account parallel operation system current-sharing performance and efficiency index, improve The performance driving economy of system and reliability, provide Reliable guarantee for parallel operation security of system, Effec-tive Function.

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 index area and maximum parallel operation system module quantity controlling party Method.Fig. 1 show parallel operation system construction drawing, and Fig. 2 show parallel operation system effectiveness and current-sharing all-round property testing system System structure chart, Fig. 3 is efficiency and current-sharing combination property area and schematic diagram.Fig. 1 mainly includes parallel operation system centralized Control Device, power module and use electric loading.Centralized Controller obtains IP and the output electric current thereof of online power module by communication bus, The quantity of the online power module of optimal control；Power module mainly realizes powering to the load, receive the operation control of Centralized Controller System is ordered and uploads output electric current；All kinds of electrical equipment is mainly comprised by electric loading.The realization of current-sharing regulatory function is with or without communication Bus autonomous equalizing current mode and have the equal stream mode of communication bus, is realized by special flow equalizing function module, and the present invention does not repeats.Figure 2 major functions are to obtain parallel operation system effectiveness and the functional relationship η=Φ (i) of load current and module current-sharing relative deviation The mathematic expectaion mathematical relationship θ=Ψ (i) with load current reciprocal, and determine respective optimal load electric currentWithAt this On the basis of, with the area of η=Φ (i) and θ=Ψ (i) with as object function, ask forWithBetween electric current I_refSo thatSo that it is determined that when efficiency and current-sharing combination property optimum Load current I_ref.Fig. 2 mainly includes host computer (PC), program-control electronic load, power module, energy meter etc..Host computer (PC) major function is for obtaining online power module IP address, input power, power module output current, output, control Program-control electronic load operating current processed, calculating η=Φ (i), θ=Ψ (i) and optimal load electric current I_ref；Program-control electronic load is used Load current in regulation parallel operation system；Power module mainly realize receive IP set, receive host computer order data and Upload output electric current, output to host computer；Energy meter is mainly used in measuring the input power of online power module.Fig. 3 gives Go out I_refPlace is interval wherein guarantees 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 parallel operation test System power supply module number, the occurrence of K can set according to practical situation, I_NFor power module rated current；For also alliance Electricity system nominal output electric current, 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 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 output electric current at i-th, wherein: U >=i >=1；M' is power module sequence number, meets: K power module IP is mapped as m'=1 according to order from small to large, and 2 ... K, i.e. m'=1 are the power module sequence number that IP is minimum, and m'=2 is IP Secondary minimal 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 Need to be to when single online power module output current, output voltage and input power data sampling number during a certain load current point Amount, V can be sized according to actual needs.Data_curr(m') (i) (j), (K >=m' >=1, U >=i >=1, V >=j >=1) is sequence number Power module for m' existsUnder the conditions of jth current sampling data；Data_volt(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 output voltage hits According to；P (m') (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 input power sampled data；η (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 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 power supply Module existsUnder the conditions of current-sharing target reference, meet:Wherein: U >=i >=1；η_i For K power module at current-sharing expectation electric current it isOperating mode under average efficiency, meet: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'iElectricity for serial number m' Source module existsUnder the conditions of the mathematic expectaion absolute value of V δ (m') (i) (j), meet:E_iFor K power module current-sharing relative deviation mathematic expectaion meansigma methods, meet θ_iFor E_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 parallel operation system works in State needs T_total=3 × K × V × T₁Time, thus it must is fulfilled for T >=T_total.Again due to current-sharing performance data reliability with Sampling number and sampling time T₁Relevant, thus T and T need to be considered according to the actual requirements₁Size, it is ensured that current-sharing performance indications Reliability.

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 operation system current-sharing relative deviation Mathematic expectaion characterizes is the global consistency between actual value and desired value, that embodies during its step response is accurate Degree, can reflect power module current-sharing performance indications；Secondly, parallel operation system is while meeting current-sharing performance indications, it should Take into account the economic benefit that system is run；Finally, by asking for the expression formula η=Φ between efficiency eta and power module load current i Expression formula θ=Ψ (i) between (i) and current-sharing relative deviation mathematic expectaion inverse θ and power module load current i and corresponding Optimal load electric currentWithOn the basis of, with the area of η=Φ (i) and θ=Ψ (i) with as object function, ask forWithBetween electric current I_refSo thatSo that it is determined that efficiency With load current I during current-sharing combination property optimum_ref, its physical significance shows which kind of load current is parallel operation system be in Lower efficiency and current-sharing combination property are best.

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

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

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:

$\mathrm{\δ}\left(m^{\′}\right)\left(i\right)\left(j\right)=\frac{{\mathrm{Data}}_{curr}\left(m^{\′}\right)\left(i\right)\left(j\right)-I_{ref}\left(i\right)}{I_{ref}\left(i\right)},---\left(2\right)$

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 absolute value E_m'iFor:

$E_{m^{\′}i}=\frac{1}{V}\left|\underset{j=1}{\overset{V}{\Σ}}\mathrm{\δ}\left(m^{\′}\right)\left(i\right)\left(j\right)\right|,---\left(3\right)$

E_m'iPhysical significance be: the power module of serial number m' existsUnder the conditions of the mathematics of relative deviation Expect, E_m'iThe least show power moduleUnder the conditions of current-sharing the best with desired value consistent performance.

Calculating K power module at current-sharing expectation electric current isTime average expectation:

$E_i=\frac{1}{K}\underset{m^{\′}=1}{\overset{K}{\Σ}}{E}_{m^{\′}i},---\left(4\right)$

Calculate E_iθ reciprocal_i, meet:

${\mathrm{\θ}}_i=\frac{1}{E_i},---\left(5\right)$

θ_iPhysical significance be: θ_iShow the most greatly power moduleUnder the conditions of current-sharing consistent performance more Good.

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 θ and power module load current i:

θ=Ψ (i), (6)

In allowing output current scope, solve load currentMeet:

$\mathrm{\Ψ}\left(I_{ref}^2\right)\≥\mathrm{\Ψ}\left(i\right),---\left(7\right)$

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

$\mathrm{\η}\left(m^{\′}\right)\left(i\right)\left(j\right)=\frac{{\mathrm{Data}}_{curr}\left(m^{\′}\right)\left(i\right)\left(j\right)\×{\mathrm{Data}}_{volt}\left(m^{\′}\right)\left(i\right)\left(j\right)}{P\left(m^{\′}\right)\left(i\right)\left(j\right)}\×100\%,---\left(8\right)$

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:

${\mathrm{\η}}_{m^{\′}i}=\frac{1}{V}\underset{j=1}{\overset{V}{\Σ}}\mathrm{\η}\left(m^{\′}\right)\left(i\right)\left(j\right),---\left(9\right)$

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:

${\mathrm{\η}}_i=\frac{1}{K}\underset{m^{\′}=1}{\overset{K}{\Σ}}{\mathrm{\η}}_{m^{\′}i},---\left(10\right)$

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), (11)

In allowing output current scope, solve load currentMeet:

$\mathrm{\Φ}\left(I_{ref}^1\right)\≥\mathrm{\Φ}\left(i\right),---\left(12\right)$

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

$\left(\right|{\∫}_{I_{ref}^1}^{I_{ref}}\mathrm{\Φ}\left(i\right)di|+|{\∫}_{I_{ref}}^{I_{ref}^2}\mathrm{\Ψ}\left(i\right)di\left|\right)\≥\left(\right|{\∫}_{I_{ref}^1}^i\mathrm{\Φ}\left(i\right)di|+|{\∫}_i^{I_{ref}^2}\mathrm{\Ψ}\left(i\right)di\left|\right),---\left(13\right)$

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.

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；

Calculate parallel operation system load electric current I_out, meet:

$I_{out}=\underset{m=1}{\overset{M}{\Σ}}Curr\left(m\right),---\left(14\right)$

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

$I_{share}=\frac{I_{out}}{M},---\left(15\right)$

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

Δ I=| I_share-I_ref|, (16)

Judge whether Δ I meets inequality:

Δ I ＜ σ, (17)

In the case of inequality (17) 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^{*}=\[\frac{I_{out}}{I_{ref}}\],---\left(18\right)$

In the case of inequality (17) is ungratified, calculate parallel operation system online power module regulated quantity Δ N^*, full Foot:

ΔN^*=N^*-M, (19)

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 index area and maximum parallel operation system module quantity controlling party Method, comprises the 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 deviationAnd mathematic expectaion(E_m'_iThe least show power supply mould The current-sharing consistent performance of block is the best)；Calculating K power module at current-sharing expectation electric current isTime E_m'_iMeansigma methodsCalculate E_iθ reciprocal_i(θ_iShow that the most greatly power module average current-sharing consistent performance is the best)；Calculate serial number m' Power module at current-sharing expectation electric current isTime efficiency With efficiency mathematic expectaion(η_m'iShow that the most greatly the efficiency of power module is the highest)；Calculate K power supply mould Block at current-sharing expectation electric current isOperating mode under average efficiency

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

(4) in allowing output current scope, solveMeetMaximum andMeetMaximum；

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

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

(8) judge | I_share-I_ref| whether≤σ sets up？If it is, enter step (6)；Otherwise, then step (9) is entered；

(9) calculating online power module output current is reference current I_refTime power module quantity N^*, i.e.(rounding operation)；

(10) N is judged^*≤1？Whether set up？If it is, enter step (11)；Otherwise, enter step (12)；

(11) 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.

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

(13) Δ N is judged^*＞ 0？Whether set up？If it is, enter step (14)；Otherwise, enter step (15)；

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

(15) Centralized Controller reduces Δ N^*Individual online power module, 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., based on efficiency and current-sharing index area and a maximum parallel operation system module number controlling method, its feature exists In: 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 deviationAnd mathematic expectaionObtain K power module to exist Current-sharing expectation electric current isTime E_m'iMeansigma methodsObtain E_iInverseObtain the power supply of serial number m' Module at current-sharing expectation electric current isTime efficiencyWith Efficiency mathematic expectaionObtaining K power module at current-sharing expectation electric current isOperating mode under flat All efficiency

(3) respectively to U data pointWithI ∈ [1, U] carries out process and drawsLoad with power module Relation between electric current iAnd the relation η=Φ (i) between efficiency eta and power module load current i；

(4) in allowing output current scope, it is thus achieved that 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 Going 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), wherein m is for working as The sequence number of front online power module；

(7) load current of the parallel operation system of M online power module composition is obtainedWith power supply mould Block current-sharing load current

(8)|I_share-I_ref|≤σ sets up the operation then continuing step (6)；Otherwise obtain online power module output current for ginseng Examine electric current I_refTime online power module quantity N^*,

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

The most according to claim 1 based on efficiency and current-sharing index area with maximum parallel operation system module quantity control Method processed, it is characterised in that: in step (3), application fitting of a polynomial, curve matching, interpolating method are respectively to U data pointWithI ∈ [1, U] processes.

The most according to claim 1 based on efficiency and current-sharing index area with maximum parallel operation system module quantity control Method processed, 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:U≥i≥1；

(2) the power module output current sampled data data of acquisition serial number m':

Data_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) about the number of j Term hopes absolute value E_m'_i:E_m'_iRepresent that the power module of serial number m' existsBar The mathematic expectaion of the relative deviation under part；

(4) obtaining K power module at current-sharing expectation electric current isTime average expectation:

(5) E is obtained_iInverse

(6) to U data pointCarry out process to drawAnd the relation between power module load current i:And in allowing output current scope, it is thus achieved that meetLoad current

(7) power module obtaining serial number m existsCondition efficiency eta (m') (i) (j):

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

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

η_m'iRepresent that the power module of serial number m' existsUnder the conditions of efficiency average Value；

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

(10) to U data pointCarry out processing the relation drawn between efficiency eta and power module load current i:

η=Φ (i), and in allowing output current scope, it is thus achieved that meetLoad current

(11) with η=Φ (i) andArea and be object function,

Obtain and meetOptimal load electric current I_ref, its In: I_refIt is inWithBetween,It is inWithBetween.