CN106130000A - Take into account the system ambiguous control method of parallel operation of efficiency and current-sharing index - Google Patents

Abstract

The present invention relates to take into account the system ambiguous control method of parallel operation of efficiency and current-sharing index, the 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 meansigma methods θ and power module load current i and corresponding optimum pointWithOn the basis of, with system currently equal flow valuve I_shareFor input, ask for I_shareWithThe output μ of departure degree membership function^Φ(I_share) and I_shareWithThe output μ of departure degree membership function^Ψ(I_share), and according to fuzzy control rule table, draw the equal flow valuve regulated quantity Δ I of expectation, and then the quantity of adjustment module, guarantee that system works in efficiency and current-sharing integrated performance index higher level, guarantee that system effectiveness and current-sharing combination property are under higher level target, by calculating output electric current and current-sharing desired value I of each power module_shareThe mathematic expectaion of deviation, the online power module being unsatisfactory for performance requiring is optimized scheduling with standby power supply module, it is achieved parallel operation system and online power module all work near best performance point.

Description

Take into account the system ambiguous control method of parallel operation of efficiency and current-sharing index

Technical field

The present invention relates to take into account the system ambiguous control method of parallel operation of efficiency and current-sharing index, for parallel operation system System power module runs quantity optimization and controls and the Optimized Operation of power module, it is ensured that take into account parallel operation under the conditions of different loads The efficiency of system and current-sharing combination property, the method is equally applicable to other electronic equipment parallel runnings to efficiency and current-sharing performance The requirement of 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 and current-sharing composite of performance index can be taken into account.

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 take into account parallel operation system System efficiency and current-sharing effect integrated performance index in the case of different loads are in higher level, are necessary for setting up efficiency and current-sharing Comprehensive performance evaluation index, the power module output current value that acquisition integrated performance index is corresponding time higher.As long as controlling parallel connection Electric power system power module output current is near optimum output electric current, ensures that parallel operation system is in different loads feelings Under condition, efficiency and current-sharing effect integrated performance index are optimum.Meanwhile, at optimal control parallel operation system online power supply mould The quantity of block so that on the basis of parallel operation system power supply module works near integrated performance index optimum point all the time, also Need the dynamic current equalizing performance indications of each online power module are estimated and Optimized Operation, it is ensured that each module and parallel connection Electric power system is 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 control method realizes system effectiveness and the optimization of current-sharing integrated performance index and the Optimized Operation of each online power module. Thus, a kind of reliable and practical parallel operation system control method is just particularly important, and it is for parallel operation system Reliability service has important impact.

Summary of the invention

It is an object of the invention to overcome above-mentioned weak point, it is proposed that take into account the parallel operation system of efficiency and current-sharing index System fuzzy control method.

The technical scheme is that a kind of system ambiguous control method of parallel operation taking into account efficiency and current-sharing index, 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 gather V Individual output electric current Data_curr(m') (i) (j), output voltage Data_volt(m') (i) (j) and input power P (m') (i) (j)；Its In: 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 Meet 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 deviationWith mathematic expectaion absolute valueObtain K power module At current-sharing expectation electric current it isTime E_m'iMeansigma methodsThe power module obtaining serial number m' is expected in current-sharing Electric current isTime efficiencyWith efficiency mathematic expectaionObtaining K power module at current-sharing expectation electric current isOperating mode under average efficiency

(3) respectively to U data pointWithMatching drawsWith power module load electricity Relation between stream iAnd the relation η=Φ (i) between efficiency eta and power module load current i；

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

(5) 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), m and is Current online power module sequence number；

(6) 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, n is the current sample number of times of same online power module；

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

(8) load current of the parallel operation system of M online power module composition is obtainedOnline Power module current-sharing load current

(9) with I_shareFor input, obtain I respectively_shareWithThe output μ of departure degree membership function^Φ(I_share) and I_shareOutput μ with departure degree membership function^Ψ(I_share)；

(10) with μ^Φ(I_share) and μ^Ψ(I_share) for inputting, draw correspondence according to fuzzy control rule table and fuzzy reasoning Control rule, and carry out precision calculating according to fuzzy control centroid method principle ambiguity solution, obtain online power module electric current and adjust The exact value of the output current adjustment Δ I of joint amount membership function μ (Δ I):

(11) judge whether≤σ sets up | Δ I |；

(12) in step (11) | Δ I |≤σ is false, then obtain the online power module of parallel operation system expection current-sharing Load current: I_share=I_share+ΔI；

(13) obtaining online power module output current is reference current I_shareTime online power module quantity N^*,

(14)N^*≤ 1 arranges N^*=2；Otherwise, then obtain parallel operation system and need to regulate 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；

(15) in step (11), | Δ I |≤σ sets up；Then obtain the output electric current Curr_ of the online power module of serial number m 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；

(16) mathematic expectaion of online power module deviation θ (m) (n) of serial number m is obtainedIts In: n=1 ... T；M=1,2,3 ... M；

(17)Then continue next online power module detection, otherwise then marking serial numbers is the online power supply mould of m Block current-sharing performance is undesirable, C_θForMaximum permissible value；

(18) 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；Continuing the operation of step (5), wherein Num is for being labeled as the undesirable online power supply of current-sharing performance Module number.

Step (3) application fitting of a polynomial, curve-fitting method are respectively to U data pointWithIt is fitted processing.

In step (9), pass through respectively

Obtain I_shareWithThe output μ of departure degree membership function^Φ(I_share) and I_shareWith departure degree degree of membership letter The output μ of number^Ψ(I_share),

Wherein: s={NM, NS, O, PS, PM}, Unit: Unit:Unit:

In step (10), pass through

Obtain online power module current adjustment membership function μ (Δ I),

Wherein: s={NM, NS, O, PS, PM}, Unit: Single Position:Unit:

In step (1)-step (4),

(1) t ∈ ((i-1) T, iT], (U >=i >=1), electronic load current isTime, obtain the equal of power module Stream 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):

(3) power module obtaining serial number m' existsUnder the conditions of relative deviation δ (m') (i) (j) about j's 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 absolute value of relative deviation；

(4) obtaining K power module at current-sharing expectation electric current isTime relative deviation mathematic expectaion absolute value flat Average:

(5) to U data pointCarry out process to drawAnd the relation between power module load current i:And in allowing output current scope, obtain and meetLoad current

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

(7) 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 the meansigma methods of efficiency；

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

(9) 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, obtain and meetLoad current

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 Parallel operation system power supply module current-sharing relative deviation mathematic expectaion meansigma methodsAnd the expression between power module load current i FormulaAnd ask for load current corresponding during Ψ (i) minimumThen, according to Φ (i) and the characteristic of Ψ (i), expert Heuristics and fuzzy theory, be given with(wherein:) and(wherein:) it is input quantity, Power module output current regulated quantity Δ I is membership function and the fuzzy control rule table of controlled quentity controlled variable；Again, according to Fuzzy Control System strategy regulates online power module quantity in real time, it is ensured that system works between optimized working zone all the time；Finally, work in system Under the conditions of between optimized working zone, obtain each power module output current data of on-line operation, draw output current data The mathematic expectaion of flow valuve deviation equal with target, thus differentiate whether the power module of each on-line operation meets and require and carry out excellent Change scheduling controlling.Owing to its characteristic of power module of same size totally keeps consistent, thereby through measure K (the big I of K by User determines, it is 10 that K of the present invention fixes tentatively) the parallel operation system current sharing under different loads electric current of individual power module composition Energy index can obtain the parallel operation system of any N number of power module composition current-sharing performance in the case of different loads and refer to Mark.Then, the output electric current of each power module run and the mathematic expectaion of target equal flow valuve deviation are obtained.Ensureing power supply On the premise of module number optimum, the mathematic expectaion size according to deviation is scheduling controlling to running power module, it is ensured that each The performance of the power module run 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 Relative deviation mathematic expectaion meansigma methodsAnd the expression formula between power module load current iAnd correspondence optimum pointWithOn the basis of, with parallel operation system currently equal flow valuve I_shareFor input, ask for I_shareWithDeparture degree membership function Output μ^Φ(I_share) and I_shareWithThe output μ of departure degree membership function^Ψ(I_share), and according to the mould of expertise Stick with paste control rule table, show that parallel operation system power supply module expects equal flow valuve regulated quantity Δ I, and then regulation parallel operation system The quantity of online power module, it is ensured that parallel operation system works in efficiency and current-sharing integrated performance index higher level.

(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 under higher level target, passes through Calculate output electric current and current-sharing desired value I of each power module_shareThe mathematic expectaion of deviation, performance is unsatisfactory for require Line power module and standby power supply module are optimized scheduling, it is achieved parallel operation system and online power module all work Near best performance point；

(6) the system ambiguous control method of parallel operation taking into account efficiency and current-sharing index of the present invention has reliability Height, the feature such as practical；Can effectively take into account parallel operation system current-sharing performance and efficiency index, improve the economical operation of system Property and reliability, for parallel operation security of system, Effec-tive Function provide Reliable guarantee.

Accompanying drawing explanation

Fig. 1 is parallel operation system effectiveness and current-sharing comprehensive performance testing system structure chart.

Fig. 2 is parallel operation system construction drawing.

Fig. 3 a is I_shareWithDeparture degree membership function μ^Φ(I_share)。

Fig. 3 b is I_shareWithDeparture degree membership function μ^Ψ(I_share)。

Fig. 3 c is current-sharing electric current regulation output membership function μ (Δ I).

Fig. 4 is fuzzy decision rule list.

Detailed description of the invention

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

The invention provides the system ambiguous control method of parallel operation taking into account efficiency and current-sharing index.Fig. 1 show also Alliance electricity system effectiveness and current-sharing comprehensive performance testing system structure chart, Fig. 2 show parallel operation system construction drawing, and Fig. 3 is Fuzzy control membership function, Fig. 4 is fuzzy reasoning table.Fig. 1 major function is to obtain parallel operation system effectiveness and load electricity Functional relationship η=the Φ (i) of stream and module current-sharing relative deviation mathematic expectaion meansigma methods and the mathematical relationship of load currentAnd determine respective optimal load electric currentWithFig. 1 mainly include host computer (PC), program-control electronic load, Power module, energy meter etc..Host computer (PC) major function is for obtaining online module I P address, input power, module output Electric current, output, control program-control electronic load operating current, calculate η=Φ (i) andCorresponding optimal load electricity StreamWithProgram-control electronic load is for regulating the load current of parallel operation system；Power module mainly realizes receiving IP and sets Determine, receive host computer order data and upload output electric current, output to host computer；Energy meter is mainly used in measuring online electricity The input power of source module.Fig. 2 mainly includes parallel operation system Centralized Controller, power module and use electric loading.Concentrate control Device processed at the IP of wire module and exports electric current by communication bus acquisition, according to the online power supply of fuzzy control principle optimal control The quantity of module and the underproof power module of Optimized Operation performance；Power module mainly realizes powering to the load, receiving concentration The operation control command of controller and upload output electric current；All kinds of electrical equipment is mainly comprised by electric loading.Current-sharing regulatory function Realization with or without communication bus autonomous equalizing current mode and have the equal stream mode of communication bus, special flow equalizing function module realize, The present invention does not repeats.Fig. 3 a, Fig. 3 b and Fig. 3 c is fuzzy control membership function, is used for providing the equal flow valuve of parallel operation system I_shareWithThe output μ of departure degree membership function^Φ(I_share) and I_shareWithThe output μ of departure degree membership function^Ψ (I_share) and power module current-sharing current adjustment membership function μ (Δ I).Fig. 4 is fuzzy decision rule list, for μ^Φ (I_share)、μ^Ψ(I_share) carry out fuzzy decision.

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 parallel operation 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(containing underloading, semi-load, specified load and overload conditions, U must Must be the positive integer not less than 20, user can determine according to the maximum load current value of system work)；For electronics Output electric current when being supported at i-th, wherein: U >=i >=1；M' is power module sequence number, meet: the IP of K modular power source according to Order from small to large is mapped as m'=1, and 2 ... K, i.e. m'=1 are the power module sequence number that IP is minimum, and m'=2 is IP minimum Module sequence number ..., m'=K is the module sequence number that IP is maximum by that analogy；V is that parallel operation system is in a certain load current point Time need to be to when single online power module output current, output voltage and input power data sampling quantity, V can be according to actual need It is sized.Data_curr(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 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' existsUnder the conditions of The jth efficiency data calculated, meets: 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 adopt Sample electric current and current-sharing reference target electric currentRelative standard deviation values, meet: E_m'iPower module for serial number m' existsUnder the conditions of the mathematic expectaion absolute value of V δ (m') (i) (j), meet: Exist for K power moduleUnder the conditions of current-sharing relative deviation mathematic expectaion meansigma methods, 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 × K altogether × 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 and 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 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 (i) and current-sharing relative deviation mathematic expectaion meansigma methodsAnd the expression formula between power module load current iAnd it is right The optimal load electric current answeredWithItsShow power module load current value during parallel operation system effectiveness optimum,Table Load current value during bright parallel operation system current-sharing best performance.

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

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:

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

E_m'iPhysical significance be: the power module of serial number m' existsUnder the conditions of mathematics phase of relative deviation Hope absolute value, E_m'iThe least show power moduleUnder the conditions of actual current value with expect equal flow valuve concordance The best.

Calculating K power module at current-sharing expectation electric current isTime relative deviation the meansigma methods of mathematic expectaion absolute value:

Physical significance be:The least show power moduleUnder the conditions of the concordance of current-sharing the best.

Application Related Computational Methods (such as fitting of a polynomial, curve matching, interpolating method etc.) is to U data point Carry out process to drawAnd the expression formula between power module load current i:

In allowing output current scope, solve load currentMeet:

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

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

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:

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), (10)

In allowing output current scope, solve load currentMeet:

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_shareOnline power module output current current-sharing when running for parallel operation system Desired value；Δ I is current-sharing desired value regulated value；σ is the threshold value of Δ I；Curr_store (m) (n) is the online power supply of serial number m The output electric current storage array of module, m=1,2, ┄, M；N=1,2, ┄, T；Online power module for serial number m Output electric current storage array Curr_store (m) (n) meansigma methods；θ (m) (n) is the online power module of serial number m Curr_store (m) (n) and current-sharing desired value I_shareDeviation:Mathematic expectaion for θ (m) (n)；C_θForMaximum allowable Value；NB: represent negative big；NM: represent in bearing；NS: represent negative little；Z: represent zero；PS: represent the least；PM: represent center；PB: table Show honest；μ^Φ(I_share): equal flow valuve I of parallel operation system_shareWithDeparture degree membership function；μ^Ψ(I_share): I_shareWithDeparture degree membership function；μ (Δ I): online power module current-sharing current adjustment Δ I membership function；μ^Φ (I_share), μ^Ψ(I_share) and μ (Δ I) meet formula (12)～(20) respectively；

μ^Ψ(I_share) expression formula is:

μ (Δ I) expression formula is: Δ I unit is:

Wherein: s={NM, NS, O, PS, PM}, Unit: Unit:Unit:

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), (21)

Curr_store (m) (T)=Curr (m), (22)

Wherein: m=1,2, ┄, M, n=1,2, ┄, T-1；

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

Wherein: m=1,2,3 ... M；

Calculate parallel operation system load electric current I_out, meet:

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

By I_shareAs input, substitute into membership function μ^Φ(I_share), μ^Ψ(I_share) corresponding formula (12)～(17) ask Take the degree of membership of correspondence, and with μ^Φ(I_share)、μ^Ψ(I_share) for inputting, the fuzzy decision rule drawn according to expertise knowledge Then table and fuzzy deduction, calculates the degree of membership of online power module current-sharing current adjustment μ (Δ I), and applies center of gravity ambiguity solution Control method solves online power module current-sharing current adjustment Δ I exact value:

Judge whether Δ I meets inequality:

| Δ I |≤σ, (27)

In the case of inequality (27) is ungratified, show that system online power module quantity is not in optimal value attached Closely, calculating parallel operation system online power module expection current-sharing load current:

I_share=I_share+ Δ I, (28)

Calculating online power module output current is reference current I_shareTime online power module quantity N^*, i.e.

Calculate parallel operation system online power module quantity regulating amount Δ N^*, meet:

ΔN^*=N^*-M, (30)

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.

In the case of inequality (27) meets, show that system online power module quantity is near optimal value.Now, Calculate online power module output current storage data Curr_store (m) (n) and current-sharing desired value I of serial number m_shareInclined Difference:

θ (m) (n)=Curr_store (m) (n)-I_share, (31)

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；

Wherein: n=1 ... T；M=1,2,3 ... M；

Judge whether the output electric current of online power module of serial number m meets with the standard deviation of current-sharing desired value deviation Inequality:

If the online power module of serial number m meets inequality (33), 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.

The invention provides the system ambiguous control method of parallel operation taking into account efficiency and current-sharing index, including walking as follows Rapid:

(1) the parallel operation system load electric current I of K power module composition is obtained in advance_outFromAccording to being spaced apartEquidistantly change toTime (for meet contain underloading, semi-load, specified load and overload conditions, U is necessary for being not less than The positive integer of 20；I_NRated current for power module), each power module is at different loads electric currentSituation V output electric current Data of lower collection_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 the sequence number that load current value is corresponding Value；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 deviationWith mathematic expectaion absolute value(E_m'iThe least actual current showing power module with Expect that equal flow valuve concordance is the best)；Calculating K power module at current-sharing expectation electric current isTime E_m'iMeansigma methodsMeter The power module calculating serial number m' 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 etc.) is to U data pointWithMatching drawsAnd the expression formula between power module load current iAnd efficiency eta and power supply mould Expression formula η=Φ (i) between block load current i；

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

(5) 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；

(6) 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；

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

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

(9) with I_shareFor input, ask for I_shareWithThe output μ of departure degree membership function^Φ(I_share) and I_shareWith The output μ of departure degree membership function^Ψ(I_share)；

(10) with μ^Φ(I_share) and μ^Ψ(I_share) for inputting, draw correspondence according to fuzzy control rule table and fuzzy reasoning Control rule, and carry out precision calculating according to fuzzy control centroid method principle ambiguity solution, ask for online power module electric current and adjust The exact value of the output current adjustment Δ I of joint amount membership function μ (Δ I)；

(11) judge whether≤σ sets up | Δ I |？If it is, enter step (20)；Otherwise, then step (12) is entered；

(12) parallel operation system online power module expection current-sharing load current: I is calculated_share=I_share+ΔI；

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

(14) N is judged^*≤1？Whether set up？If it is, enter step (15)；Otherwise, enter step (16)；

(15) 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；

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

(17) Δ N is judged^*＞ 0？Whether set up？If it is, enter step (18)；Otherwise, enter step (19)；

(18) Centralized Controller increases Δ N^*Individual online power module, subsequently into step (5)；

(19) Centralized Controller reduces Δ N^*Individual online power module, subsequently into step (5)；

(20) 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；

(21) mathematic expectaion of online power module deviation θ (m) (n) of serial number m is calculatedWherein: N=1 ... T；M=1,2,3 ... M；

(22) m=1 is initialized；

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

(24) judge(C_θForMaximum permissible value) if it is, enter step (27)；Otherwise, enter step (25)；

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

(26) more new variables Num=Num+1；

(27) m=m+1 is updated；

(28) m≤M is judged？If it is, enter step (24)；Otherwise, step (29) is entered；

(29) 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 (5).

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 (5)

1. the system ambiguous control method of parallel operation taking into account efficiency and current-sharing index, 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 apart Equidistantly change toTime, each power module is at different loads electric currentIn the case of gather 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 meet 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 deviationWith mathematic expectaion absolute valueObtain K power module At current-sharing expectation electric current it isTime E_m'iMeansigma methodsThe power module obtaining serial number m' is expected in current-sharing Electric current isTime efficiencyWith efficiency mathematic expectaionObtaining K power module at current-sharing expectation electric current isOperating mode under average efficiency

(3) respectively to U data pointWithI ∈ [1, U] matching drawsWith power module load current i it Between relationAnd the relation η=Φ (i) between efficiency eta and power module load current i；

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

(5) 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, it is currently to exist that the output current data of the online power module of m-th sequence number is labeled as Curr (m), m Line power module sequence number；

(6) 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, n is the current sample number of times of same online power module；

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

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

(9) with I_shareFor input, obtain I respectively_shareWithThe output μ of departure degree membership function^Φ(I_share) and I_shareWith The output μ of departure degree membership function^Ψ(I_share)；

(10) with μ^Φ(I_share) and μ^Ψ(I_share) for inputting, draw corresponding control rule according to fuzzy control rule table and fuzzy reasoning Then, and carry out precision calculating according to fuzzy control centroid method principle ambiguity solution, obtain online power module current adjustment and be subordinate to The exact value of the output current adjustment Δ I of genus degree function mu (Δ I):

(11) judge whether≤σ sets up | Δ I |；

(12) in step (11) | Δ I |≤σ is false, then obtain the online power module of parallel operation system the equal current load of expection Electric current: I_share=I_share+ΔI；

(13) obtaining online power module output current is reference current I_shareTime online power module quantity N^*,

(14)N^*≤ 1 arranges N^*=2；Otherwise, then obtain parallel operation system and need to regulate 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；

(15) in step (11), | Δ I |≤σ sets up；Then obtain the output electric current Curr_ of the online power module of serial number m 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；

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

(17)Then continue the detection of next online power module, otherwise then marking serial numbers is that the online power module of m is equal Fluidity can be undesirable, C_θForMaximum permissible value；

(18) by Num the undesirable online power module off-line of current-sharing performance, and from stand-by power supply, Num electricity is started Source module works；Continuing the operation of step (5), wherein Num is for being labeled as the undesirable online power module of current-sharing performance Quantity.

The system ambiguous control method of parallel operation taking into account efficiency and current-sharing index the most according to claim 1, its feature It is: step (3) application fitting of a polynomial, curve-fitting method are respectively to U data pointWithi∈[1, U] it is fitted processing.

The system ambiguous control method of parallel operation taking into account efficiency and current-sharing index the most according to claim 1, its feature It is: in step (9), pass through respectively

${\mathrm{\&mu;}}_{NB}^{\mathrm{\&Phi;}}\left(I_{share}\right)=\left\{\begin{array}{cc}1& 0\&le;I_{share}<0.1I_{ref}^1\\ \frac{0.4I_{ref}^1-I_{share}}{0.3I_{ref}^1}& 0.1I_{ref}^1\&le;I_{share}<0.4I_{ref}^1\\ 0& I_{share}>0.4I_{ref}^1\end{array}\right.,$

${\mathrm{\&mu;}}_s^{\mathrm{\&Phi;}}\left(I_{share}\right)=\left\{\begin{array}{cc}0& I_{share}<a_s\\ \frac{I_{share}-a_s}{b_s-a_s}& a_s\&le;I_{share}\&le;b_s\\ \frac{c_s-I_{share}}{c_s-b_s}& b_s\&le;I_{share}\&le;c_s\\ 0& I_{share}>c_s\end{array}\right.,$

${\mathrm{\&mu;}}_{NB}^{\mathrm{\&Psi;}}\left(I_{share}\right)=\left\{\begin{array}{cc}1& 0\&le;I_{share}<0.1I_{ref}^2\\ \frac{0.4I_{ref}^2-I_{share}}{0.3I_{ref}^2}& 0.1I_{ref}^2\&le;I_{share}\&le;0.4I_{ref}^2\\ 0& I_{share}>0.4I_{ref}^2\end{array}\right.,$

${\mathrm{\&mu;}}_s^{\mathrm{\&Psi;}}\left(I_{share}\right)=\left\{\begin{array}{cc}0& I_{share}<a_s^1\\ \frac{I_{share}-a_s^1}{b_s^1-a_s^1}& a_s^1\&le;I_{share}\&le;b_s^1\\ \frac{c_s^1-I_{share}}{c_s^1-b_s^1}& b_s^1\&le;I_{share}\&le;c_s^1\\ 0& I_{share}>c_s^1\end{array}\right.,$

${\mathrm{\&mu;}}_{PB}^{\mathrm{\&Psi;}}\left(I_{share}\right)=\left\{\begin{array}{cc}0& I_{share}<1.6I_{ref}^2\\ \frac{I_{share}-1.6I_{ref}^2}{0.3I_{ref}^2}& 1.6I_{ref}^2\&le;I_{share}\&le;1.9I_{ref}^2\\ 1& I_{share}>1.9I_{ref}^2\end{array}\right.$

Obtain I_shareWithThe output μ of departure degree membership function^Φ(I_share) and I_shareWith departure degree membership function Output μ^Ψ(I_share),

Wherein: s={NM, NS, O, PS, PM}, Unit: Single Position: Unit:

The system ambiguous control method of parallel operation taking into account efficiency and current-sharing index the most according to claim 1, its feature It is: in step (10), pass through

${\mathrm{\&mu;}}_{NB}\left(\mathrm{\&Delta;}I\right)=\left\{\begin{array}{cc}1& \mathrm{\&Delta;}I<-0.6\\ \frac{\mathrm{\&Delta;}I+0.4}{-0.2}& -0.6\&le;\mathrm{\&Delta;}I\&le;-0.4\\ 0& \mathrm{\&Delta;}I>-0.4\end{array}\right.,$

${\mathrm{\&mu;}}_s\left(\mathrm{\&Delta;}I\right)=\left\{\begin{array}{cc}0& \mathrm{\&Delta;}I<a_s^2\\ \frac{\mathrm{\&Delta;}I-a_s^2}{b_s^2-a_s^2}& a_s^2\&le;\mathrm{\&Delta;}I\&le;b_s^2\\ \frac{c_s^2-\mathrm{\&Delta;}I}{c_s^2-b_s^2}& b_s^2\&le;\mathrm{\&Delta;}I\&le;c_s^2\\ 0& \mathrm{\&Delta;}I>c_s^2\end{array}\right.,$

${\mathrm{\&mu;}}_{PB}\left(\mathrm{\&Delta;}I\right)=\left\{\begin{array}{cc}0& \mathrm{\&Delta;}I<0.4\\ \frac{\mathrm{\&Delta;}I-0.4}{0.2}& 0.4\&le;\mathrm{\&Delta;}I\&le;0.6\\ 1& \mathrm{\&Delta;}I>0.6\end{array}\right.$

Obtain online power module current adjustment membership function μ (Δ I),

Wherein: s={NM, NS, O, PS, PM}, Unit: Single Position: Unit:

The system ambiguous control method of parallel operation taking into account efficiency and current-sharing index the most according to claim 1, its feature It is: in step (1)-step (4),

(1) t ∈ ((i-1) T, iT], (U >=i >=1), electronic load current isTime, obtain the equal of power module Stream target reference current:U≥i≥1；

(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) about the mathematics of j Expect absolute value E_m'i:

E_m'iRepresent that the power module of serial number m' existsUnder the conditions of the mathematic expectaion absolute value of relative deviation；

(4) obtaining K power module at current-sharing expectation electric current isTime relative deviation the meansigma methods of mathematic expectaion absolute value:

(5) to U data pointCarry out process to drawAnd the relation between power module load current i: And in allowing output current scope, obtain and meetLoad current

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

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

(7) power module obtaining serial number m' existsUnder the conditions of η (m') (i) (j) about the mathematic expectaion of j 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；

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

(9) 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, obtain and meetLoad current