CN104167750B - The distributed energy storage power distribution of a kind of distribution peak load shifting and control method for coordinating - Google Patents

The distributed energy storage power distribution of a kind of distribution peak load shifting and control method for coordinating Download PDF

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CN104167750B
CN104167750B CN201410407305.4A CN201410407305A CN104167750B CN 104167750 B CN104167750 B CN 104167750B CN 201410407305 A CN201410407305 A CN 201410407305A CN 104167750 B CN104167750 B CN 104167750B
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power
storage
energy
soc
charge
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CN104167750A (en
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桑丙玉
叶季蕾
杨波
陶琼
张宇
许晓慧
薛金花
汪春
朴红艳
刘舒
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国家电网公司
中国电力科学研究院
国网福建省电力有限公司
国网福建省电力有限公司电力科学研究院
国网上海市电力公司
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Abstract

The present invention relates to a kind of distributed energy storage power for urban power distribution network peak load shifting distribute and control method for coordinating, comprise the steps: that what (1) determined distributed energy storage system peak load shifting always regulates power;(2) power distribution strategies of same type distributed energy storage system is determined;(3) power distribution strategies of the distributed mixed energy storage system of different time scales is determined;(4) distributed energy storage system is coordinated control.The present invention realizes the peak load shifting of distribution, and peak-valley ratio meets requirement;Realize charge-discharge electric power based on energy-storage system real-time status distribution and control, it is to avoid super-charge super-discharge;Realize the coordination between dissimilar energy-storage system to control, meet the regulatory demand of distribution different time scales load.

Description

The distributed energy storage power distribution of a kind of distribution peak load shifting and control method for coordinating
Technical field
The present invention relates to a kind of storage energy operation control technology, a kind of for urban power distribution network peak load shifting The distribution of distributed energy storage power and control method for coordinating.
Background technology
Growing along with City Electric Power Demand, the region that down town load density is high, often there is distribution transformer The phenomenon of overload, society's change of power structure and the quick growth of load also increase load peak-valley difference, from construction cost and The angle of protection of resources is set out, and becomes increasingly to be stranded by traditional new additional issue, the demand that defeated, controller switching equipment meets peak load Difficult.For the problem solving the electric load that quickly increases and power grid construction relatively lags behind, distribution system introduces energy storage Link, is possible not only to be effectively realized dsm, smooth load, eliminates peak-valley difference, it is also possible to improve existing power equipment Utilization rate, delays power distribution network upgrading, reduces power supply cost.
Distribution configures energy-storage system, charges when load valley, play the effect filling out paddy, discharge when load peak, There is provided peak power for electrical network, be effectively reduced system peak-valley difference.When distribution configures multiple distributed energy storage system, how State reconciliation according to distribution operation demand and energy storage controls exerting oneself of each distributed energy storage, ensures that the safety that distribution runs is steady The qualitative economy with energy-storage system, is the key issue needing solution at present badly.
Although at present the operation to energy-storage system controls to have done a lot of research, it is proposed that some meters and energy storage state parameter Progress control method, but need a kind of for centralized energy-storage system, for the multiple distributed storage of urban distribution network peak load shifting The improvement technology that the power distribution of energy system and coordination control.
Summary of the invention
For the deficiencies in the prior art, it is an object of the invention to provide a kind of that be easily achieved, effective and reasonable distributed The distribution of energy-storage system power and control method for coordinating, solve the energy storage control problem for distribution peak load shifting;The present invention to solve That determines technical problem is that: proposes a kind of distributed energy storage power for urban distribution network peak load shifting and distributes and coordinate controlling party Method: 1, realize the peak load shifting of distribution, peak-valley ratio meets requirement;2, charge and discharge electric work based on energy-storage system real-time status is realized Rate distribution and control, it is to avoid super-charge super-discharge;3, realize the coordination between dissimilar energy-storage system to control, when meeting distribution difference Between the regulatory demand of yardstick load.
It is an object of the invention to use following technical proposals to realize:
The present invention provides the distribution of distributed energy storage power and the control method for coordinating of a kind of distribution peak load shifting, and it improves it Place is, described method comprises the steps:
(1) determine distributed energy storage system peak load shifting always regulates power;
(2) power distribution strategies of same type distributed energy storage system is determined;
(3) power distribution strategies of the distributed mixed energy storage system of different time scales is determined;
(4) distributed energy storage system is coordinated control.
Further, described step (1) including: according to peak value and the valley of statistical regions internal loading, sets energy-storage system The low valley P that synthesis is exerted oneselfminWith peak value Pmax, compare load power and low valley PminWith peak value PmaxSize, when load is little In low valley PminTime, energy-storage system charges, and charging general power is load power and low valley PminDifference;When load is more than Pmax Time, energy storage system discharges, electric discharge general power is load power and peak value PmaxDifference;Load power is at low valley PminAnd peak value PmaxBetween, energy-storage system is failure to actuate, total regulation power such as formula 1 of distributed energy storage system peak load shifting) shown in:
P T = P L - P min P L < P min 0 P min < P L < P max P L - P max P L > P max - - - 1 ) ;
Wherein, PTAlways regulating power for distributed energy storage system peak load shifting, negative value represents that energy-storage system charges, on the occasion of Represent energy storage system discharges;PLFor the total active power of load, obtain in real time;Pmin、PmaxIt is respectively setting energy-storage system to synthesize The low valley of power and peak value.
Further, described step (2) comprises the steps:
<1>determine that the state-of-charge with type each distributed energy storage system is identical, the power that rated power is identical with capacity Allocation strategy;
<2>determine that the state-of-charge with type each distributed energy storage system is identical, the power that rated power is different with capacity Allocation strategy;
<3>power distribution strategies that the state-of-charge of same type each distributed energy storage system is different is determined.
Further, described step<1>including: the state-of-charge with type each distributed energy storage system is identical, specified merit In the case of rate is identical with capacity, the mode of load sharing is used power to be allocated, to formula 1) energy storage that obtains always optimizes Power is divided equally, such as following formula 2) shown in:
P E k = P T / n , k = 1,2 . . . n - - - 2 ) ;
Wherein,Power for the distribution of kth energy-storage system;N is the number of distributed energy storage system;PTFor distributed storage Can system peak load shifting always regulate power, negative value represents that energy-storage system charge, on the occasion of expression energy storage system discharges.
Further, described step<2>including: the state-of-charge with type each distributed energy storage system is identical, specified merit In the case of rate is different with capacity, rated power is big, distributes more power;Rated power is little, distribute less power, i.e. with Pro rata distribute on the basis of rated power, such as following formula 3) shown in:
P E k = P N k P N 1 + . . . + P N n P T , k = 1,2 . . . n - - - 3 ) ;
Wherein,Power for the distribution of kth energy-storage system;Rated power for kth energy-storage system;PTFor dividing Cloth energy-storage system peak load shifting always regulate power, negative value represents that energy-storage system charges, on the occasion of represent energy storage system discharges.
Further, described step<3>including: the situation that state-of-charge in same type each distributed energy storage system is different Under: carry out power distribution with energy-storage system real-time state-of-charge SOC for constraints;By real-time for energy-storage system state-of-charge SOC It is divided into five intervals, according to charge-discharge characteristic curve and the energy-storage system real-time state-of-charge SOC value of battery, determines each district Between charge-discharge electric power;Energy-storage system real-time state-of-charge SOC subregion and each interval energy storage discharge and recharge restrictive condition are as follows:
1. SOC gets over upper limit district: SOC >=SOCmaxTime, energy-storage battery limits charging, it is allowed to regular picture;
2. SOC ceiling value district: SOChigh≤ SOC < SOCmaxTime, energy-storage battery discharges as basic principle with few charging more, Slow down the increment rate of SOC;
3. the normal working area of SOC: SOClow≤ SOC < SOChighTime, the normal discharge and recharge of energy-storage battery;
4. SOC low limit value district: SOCmin≤ SOC < SOClowTime, energy-storage battery is charged as basic principle with few electric discharge more, subtracts The rate of descent of slow SOC;
5. SOC gets over lower limit district: SOC < SOCminTime, energy-storage battery limits electric discharge, it is allowed to charge normal;
According to above-mentioned subregion, obtain power assignment expression as follows:
P E ck = &alpha; P N k P E dk = &beta; P N k - - - 4 ) ;
And follow total charge-discharge electric power coupling, charge volume and discharge capacity equilibrium, obtain constraints as follows:
Total charging regulation power constraint:
&Sigma; k = 1 n P E ck = P ES c - - - 5 ) ;
Total electric discharge regulation power constraint:
&Sigma; k = 1 n P E dk = P ES d - - - 6 ) ;
Stored energy capacitance retrains:
&Sigma; P E ck T c = &Sigma; P E dk T d &le; S N k - - - 7 ) ;
Wherein,Rated power for kth energy-storage system;Rated capacity for kth energy-storage system;For The charge power of kth energy-storage system;Discharge power for kth energy-storage system;For energy-storage system need to regulate total Charge power;The total discharge power that need to regulate for energy-storage system;TcCharging interval for kth energy-storage system;TdFor kth The discharge time of individual energy-storage system;α, β are respectively energy-storage system charging and discharging adjustment factor, according to filling of different energy-storage battery The subregion value of discharge characteristic curve and SOC, the power-balance additionally taking into account whole energy-storage system is finely adjusted, and span is [0,1];SOCmax、SOCminIt is respectively the upper lower limit value of energy storage SOC, determines according to the requirement of battery in actual applications; SOChigh、SOClowBeing respectively the high-low limits of energy storage SOC, different energy-storage battery values are different, in actual applications according to battery Requirement determine.
Further, in described step (3), the power distribution strategies of the distributed mixed energy storage system of different time scales is such as Under: weigh by power variation rate and set the time scale of changed power, when power variation rate is less than limit value, compensate power by Accumulator regulates;When power variation rate is more than limit value, regulate by super capacitor beyond part;The power of accumulator regulation is such as Shown in following formula:
P bat ( t ) = P T ( t ) k < k up P bat ( t i - 1 ) + k up ( t i - t i - 1 ) k up < k - - - 8 ) ;
Wherein, k is the rate of change that mixed energy storage system need to compensate power;kupThe change of power need to be compensated for mixed energy storage system The upper limit of rate;PTT () is the general power that t energy-storage system need to regulate;Pbat(ti-1) it is ti-1The regulation of moment accumulator Power;I is integer, i=1,2 ... n;tiRepresent each time point sampled;This formula shows, when power variation rate is more than limit During definite value, the power that accumulator need to regulate adds by maximum rate of change limit value in this time equal to the power of its previous moment regulation The power of change in section, the part beyond this change limit value is regulated by super capacitor;
The power of super capacitor regulation is shown below:
PSC(t)=PT(t)-Pbat(t) 9)。
Further, in described step (4), each energy-storage system distribution power step (2) and (3) obtained, is handed down to Each energy-storage system, controls by active reactive PQ, and regulation is meritorious and idle exerts oneself, and meets the requirement of energy-storage system peak load shifting.
Compared with the prior art, the present invention reaches to provide the benefit that:
1, the distributed energy storage power for urban power distribution network peak load shifting that the present invention provides distributes and coordinates controlling party Method, can carry out peak load shifting to Distribution Network Load Data, determines that energy storage always regulates power according to peak-valley ratio and load factor, ensures distribution fortune Row safety;Rated power, capacity and state-of-charge according to distributed energy storage system distributes the regulation power of each energy-storage system, makes Storage energy operation, will not super-charge super-discharge at optimum state;Different time scales according to load fluctuation is in different types of mixing storage Distribute power between energy, make full use of the feature of different energy storage.
2, a kind of distributed energy storage power for urban distribution network peak load shifting of the present invention distributes and control method for coordinating, solves Determine and technical problem is that: 1) realize the peak load shifting of distribution, peak-valley ratio meets requirement;2) realize based on the real-time shape of energy-storage system The charge-discharge electric power distribution of state and control, it is to avoid super-charge super-discharge;3) realize the coordination between dissimilar energy-storage system to control, full The regulatory demand of foot distribution different time scales load.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the peak load shifting that the present invention provides;
Fig. 2 is that the distributed energy storage power for urban distribution network peak load shifting that the present invention provides distributes and coordinates controlling party The flow chart of method.
Detailed description of the invention
With specific embodiment, the detailed description of the invention of the present invention is described in further detail below in conjunction with the accompanying drawings.
Embodiment
Such as Fig. 1, electric discharge startup power (energy-storage system the synthesizes the peak value exerted oneself) Pmax and the charging that arrange energy-storage battery are opened Kinetic power (energy-storage system synthesizes the low valley exerted oneself) Pmin, when load starts power higher than electric discharge, energy-storage battery runs on Discharge condition;When load is less than charge initiation power, energy-storage battery runs on charged state, thus plays peak load shifting, subtracts The effect of Smaller load peak-valley difference.
The flow chart being embodied as step of the present invention is as in figure 2 it is shown, include:
(1) that asks for energy storage always regulates power;
The peak value of statistical regions internal loading and valley, according to peak and valley value of load, set energy-storage system and synthesize the low ebb exerted oneself Value PminWith peak value Pmax, compare load power and Pmin、PmaxSize, when load is less than PminTime, energy-storage system charges, charging General power is load power and PminDifference;When load is more than PmaxTime, energy storage system discharges, electric discharge general power be load power and PmaxDifference;Load is at PminAnd PmaxBetween, energy-storage system is failure to actuate, such as formula 1):
P T = P L - P min P L < P min 0 P min < P L < P max P L - P max P L > P max - - - 1 ) ;
Wherein, PTFor the general power of regulation needed for distributed energy storage system, negative value represents that energy-storage system charges, on the occasion of expression Energy storage system discharges;PLFor the total active power of load, can obtain in real time;Pmin、PmaxAccording to transformator and line load rate and want The peak-valley ratio asked sets.
(2) distributing with the power of type distributed energy storage, concrete calculation procedure is as follows;
<1>state-of-charge of each distributed energy storage system is identical, and rated power is the most identical with capacity:
In the case of the parameter of each distributed energy storage system and state are the same from, use the method for load sharing that power is entered Row distribution, to formula 1) energy storage that obtains always optimizes power and divides equally, such as formula 2):
P E k = P T / n , k = 1,2 . . . n - - - 2 ) ;
Wherein,Power for the distribution of kth energy-storage system;N is the number of distributed energy storage system.
<2>state-of-charge of each distributed energy storage system is identical, and rated power is different with capacity:
When the rated power of each distributed energy storage system is different with capacity, it is impossible to the method using load sharing.Charged In the case of state is identical, rated power is big, should distribute more power;Rated power is little, should distribute less power, i.e. with Pro rata distribute on the basis of rated power, such as formula 3):
P E k = P N k P N 1 + . . . + P N n P T , k = 1,2 . . . n - - - 3 ) ;
Wherein,Power for the distribution of kth energy-storage system;Rated power for kth energy-storage system.
<3>state-of-charge of each distributed energy storage system is different:
During each distributed energy storage system state-of-charge difference, for ensureing energy-storage system safety and economic operation, should be with energy storage system The real-time state-of-charge SOC that unites is that constraints carries out power distribution.SOC is divided into five intervals, according to the discharge and recharge of battery Characteristic curve and SOC value, determine the charge-discharge electric power in each interval.SOC subregion and each interval energy storage discharge and recharge restrictive condition are such as Under:
1. SOC gets over upper limit district: SOC >=SOCmaxTime, energy-storage battery limits charging, it is allowed to regular picture;
2. SOC ceiling value district: SOChigh≤ SOC < SOCmaxTime, energy-storage battery discharges as basic principle with few charging more, Slow down the increment rate of SOC as far as possible;
3. the normal working area of SOC: SOClow≤ SOC < SOChighTime, energy-storage battery can normally discharge and recharge;
4. SOC low limit value district: SOCmin≤ SOC < SOClowTime, energy-storage battery is charged as basic principle with few electric discharge more, to the greatest extent Amount slows down the rate of descent of SOC;
5. SOC gets over lower limit district: SOC < SOCminTime, energy-storage battery limits electric discharge, it is allowed to charge normal;
According to above-mentioned subregion, available power allocation algorithm is as follows:
P E ck = &alpha; P N k P E dk = &beta; P N k - - - 4 ) ;
Separately follow total charge-discharge electric power coupling, charge volume and discharge capacity equilibrium, constraints can be obtained as follows:
Total charging regulation power constraint:
&Sigma; k = 1 n P E ck = P ES c - - - 5 ) ;
Total electric discharge regulation power constraint:
&Sigma; k = 1 n P E dk = P ES d - - - 6 ) ;
Stored energy capacitance retrains:
&Sigma; P E ck T c = &Sigma; P E dk T d &le; S N k - - - 7 ) ;
Wherein,Rated power for kth energy-storage system;Rated capacity for kth energy-storage system;For The charge power of kth energy-storage system;Discharge power for kth energy-storage system;For energy-storage system need to regulate total Charge power;The total discharge power that need to regulate for energy-storage system;TcCharging interval for kth energy-storage system;TdFor kth The discharge time of individual energy-storage system;α, β are respectively energy-storage system charging and discharging adjustment factor, according to filling of different energy-storage battery The subregion value of discharge characteristic curve and SOC, the power-balance additionally taking into account whole energy-storage system is finely adjusted, and span is [0,1];SOCmax、SOCminBeing respectively the upper lower limit value of energy storage SOC, different energy-storage battery values are different, as lead-acid battery Taking 90%-20%, lithium battery typically takes 90%-10%, determines according to the requirement of battery in actual applications.SOChigh、 SOClowBeing respectively the high-low limits of energy storage SOC, different energy-storage battery values are different, take 70%-50% as lead-acid battery, Lithium battery typically takes 80%-20%, determines according to the requirement of battery in actual applications.
(3) the power distribution of the distributed hybrid energy-storing of different time scales:
The distributed hybrid energy-storing of different time scales mainly considers super capacitor and accumulator.First super capacitor is considered And the power distribution between battery energy storage system, main consider different load types, the load variations in short-term time scale by Super capacitor regulates, and the load variations of long time scale is regulated by accumulator;Consider super-capacitor voltage, battery and then The state limit such as SOC, are modified compensating.
The power distribution algorithm of hybrid energy-storing is as follows: the time scale power variation rate setting changed power is weighed, when When power variation rate is less than limit value, compensates power and all regulated by accumulator;When power variation rate is more than limit value, exceed Part is regulated by super capacitor.The power that accumulator need to regulate is as follows:
P bat ( t ) = P T ( t ) k < k up P bat ( t i - 1 ) + k up ( t i - t i - 1 ) k up < k - - - 8 ) ;
Wherein, k is the rate of change of the power that hybrid energy-storing need to compensate;kupRate of change for the power that hybrid energy-storing need to compensate The upper limit;PTT () is the general power that t energy-storage system need to regulate;Pbat(ti-1) it is ti-1The merit of moment accumulator regulation Rate;I is integer, i=1,2 ... n;tiRepresent each time point sampled;This formula shows, when power variation rate is more than limiting During value, the power that accumulator need to regulate adds by maximum rate of change limit value in this time period equal to the power of its previous moment regulation The power of upper change, the part beyond this change limit value is regulated by super capacitor;
The power that super capacitor need to regulate is as follows:
PSC(t)=PT(t)-Pbat(t) 9)。
(4) distributed energy storage system coordination controls:
Either with type energy storage or different types of mixed energy storage system, when urban distribution network peak load shifting it is all It is incorporated into the power networks, each energy storage distribution power above-mentioned steps (2) and (3) obtained, is handed down to each energy-storage system, uses active reactive PQ controls, and regulation active reactive is exerted oneself, and meets the requirement of system peak load shifting.
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit, to the greatest extent The present invention has been described in detail by pipe with reference to above-described embodiment, and under inspiring at this, those of ordinary skill in the field depend on So can modify the detailed description of the invention of the present invention or equivalent, these are without departing from spirit and scope of the invention Any amendment or equivalent, within the claims of the present invention all awaited the reply in application.

Claims (1)

1. the distributed energy storage power of a distribution peak load shifting distributes and control method for coordinating, it is characterised in that described method Comprise the steps:
(1) determine distributed energy storage system peak load shifting always regulates power;
(2) power distribution strategies of same type distributed energy storage system is determined;
(3) power distribution strategies of the distributed mixed energy storage system of different time scales is determined;
(4) distributed energy storage system is coordinated control;
Described step (1) including: according to peak value and the valley of statistical regions internal loading, sets energy-storage system and synthesizes the low ebb exerted oneself Value PminWith peak value Pmax, compare load power and low valley PminWith peak value PmaxSize, when load is less than low valley PminTime, Energy-storage system charges, and charging general power is load power and low valley PminDifference;When load is more than PmaxTime, energy-storage system is put Electricity, electric discharge general power is load power and peak value PmaxDifference;Load power is at low valley PminWith peak value PmaxBetween, energy storage system System is failure to actuate, total regulation power such as formula 1 of distributed energy storage system peak load shifting) shown in:
Wherein, PTAlways regulating power for distributed energy storage system peak load shifting, negative value represents that energy-storage system charges, on the occasion of expression Energy storage system discharges;PLFor the total active power of load, obtain in real time;Pmin、PmaxIt is respectively and sets what energy-storage system synthesis was exerted oneself Low valley and peak value
Described step (2) comprises the steps:
<1>determine that the state-of-charge with type each distributed energy storage system is identical, the power distribution that rated power is identical with capacity Strategy;
<2>determine that the state-of-charge with type each distributed energy storage system is identical, the power distribution that rated power is different with capacity Strategy;
<3>power distribution strategies that the state-of-charge of same type each distributed energy storage system is different is determined;
Described step<1>including: the state-of-charge with type each distributed energy storage system is identical, and rated power is identical with capacity In the case of, use the mode of load sharing power to be allocated, to formula 1) the distributed energy storage system peak load shifting that obtains Total regulation power is divided equally, such as following formula 2) shown in:
PEk=PT/ n, k=1,2...n 2);
Wherein,Power for the distribution of kth energy-storage system;N is the number of distributed energy storage system;PTFor distributed energy storage system System peak load shifting always regulate power, negative value represents that energy-storage system charge, on the occasion of expression energy storage system discharges;
Described step<2>including: the state-of-charge with type each distributed energy storage system is identical, and rated power is different with capacity In the case of, rated power is big, distributes more power;Rated power is little, distributes less power, i.e. with rated power as base Quasi-pro-rata, such as following formula 3) shown in:
Wherein,Power for the distribution of kth energy-storage system;Rated power for kth energy-storage system;PTFor distributed storage Can system peak load shifting always regulate power, negative value represents that energy-storage system charge, on the occasion of expression energy storage system discharges;
Described step<3>including: in the case of the state-of-charge difference of same type each distributed energy storage system: with energy-storage system State-of-charge SOC is that constraints carries out power distribution in real time;Real-time for energy-storage system state-of-charge SOC is divided into five districts Between, according to charge-discharge characteristic curve and the energy-storage system real-time state-of-charge SOC value of battery, determine the charge and discharge electric work in each interval Rate;Energy-storage system real-time state-of-charge SOC subregion and each interval energy storage discharge and recharge restrictive condition are as follows:
1. SOC gets over upper limit district: SOC >=SOCmaxTime, energy-storage battery limits charging, it is allowed to regular picture;
2. SOC ceiling value district: SOChigh≤ SOC < SOCmaxTime, energy-storage battery discharges as basic principle with few charging more, slows down The increment rate of SOC;
3. the normal working area of SOC: SOClow≤ SOC < SOChighTime, the normal discharge and recharge of energy-storage battery;
4. SOC low limit value district: SOCmin≤ SOC < SOClowTime, energy-storage battery is charged as basic principle with few electric discharge more, slows down The rate of descent of SOC;
5. SOC gets over lower limit district: SOC < SOCminTime, energy-storage battery limits electric discharge, it is allowed to charge normal;
According to above-mentioned subregion, obtain power assignment expression as follows:
And follow total charge-discharge electric power coupling, charge volume and discharge capacity equilibrium, obtain constraints as follows:
Total charging regulation power constraint:
Total electric discharge regulation power constraint:
Stored energy capacitance retrains:
Wherein,Rated power for kth energy-storage system;Rated capacity for kth energy-storage system;For kth The charge power of energy-storage system;Discharge power for kth energy-storage system;The merit of always charging that need to regulate for energy-storage system Rate;The total discharge power that need to regulate for energy-storage system;TcCharging interval for kth energy-storage system;TdFor kth energy storage system The discharge time of system;α, β are respectively energy-storage system charging and discharging adjustment factor, according to the charge-discharge characteristic of different energy-storage batteries The subregion value of curve and SOC, the power-balance additionally taking into account whole energy-storage system is finely adjusted, and span is [0,1]; SOCmax、SOCminIt is respectively the upper lower limit value of energy storage SOC, determines according to the requirement of battery in actual applications;SOChigh、 SOClowBeing respectively the high-low limits of energy storage SOC, different energy-storage battery values are different, in actual applications according to the requirement of battery Determine;
In described step (3), the power distribution strategies of the distributed mixed energy storage system of different time scales is as follows: use changed power Rate weighs the time scale setting changed power, when power variation rate is less than limit value, compensates power and is regulated by accumulator;When When power variation rate is more than limit value, regulate by super capacitor beyond part;The power of accumulator regulation is shown below:
Wherein, k is the rate of change that mixed energy storage system need to compensate power;kupThe rate of change of power need to be compensated for mixed energy storage system The upper limit;PTT () is the general power that t energy-storage system need to regulate;Pbat(ti-1) it is ti-1The merit of moment accumulator regulation Rate;I is integer, i=1,2 ... n;tiRepresent each time point sampled;This formula shows, when power variation rate is more than limiting During value, the power that accumulator need to regulate adds by maximum rate of change limit value in this time period equal to the power of its previous moment regulation The power of upper change, the part beyond this change limit value is regulated by super capacitor;
The power of super capacitor regulation is shown below:
PSC(t)=PT(t)-Pbat(t) 9);
In described step (4), each energy-storage system distribution power step (2) and (3) obtained, is handed down to each energy-storage system, uses Active reactive PQ controls, and regulation is meritorious and idle exerts oneself, and meets the requirement of energy-storage system peak load shifting.
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