CN103311943A - Control method of hybrid energy storage system for stabilizing power fluctuation of intermittent type power source - Google Patents

Control method of hybrid energy storage system for stabilizing power fluctuation of intermittent type power source Download PDF

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CN103311943A
CN103311943A CN2013100910572A CN201310091057A CN103311943A CN 103311943 A CN103311943 A CN 103311943A CN 2013100910572 A CN2013100910572 A CN 2013100910572A CN 201310091057 A CN201310091057 A CN 201310091057A CN 103311943 A CN103311943 A CN 103311943A
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power
max
ultracapacitor
battery
bess
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CN2013100910572A
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CN103311943B (en
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李建林
程成
马会萌
惠东
高志强
高骏
范辉
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国家电网公司
中国电力科学研究院
河北省电力公司电力科学研究院
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Abstract

The invention discloses a control method of a hybrid energy storage system for stabilizing the power fluctuation of an intermittent type power source, comprising the following steps of acquiring the real-time power of the intermittent type power source, the synthetic output power of power and stored energy, the SOC (State of Charge) of a battery and the voltage of a supercapacitor by a data acquisition module, and sending data to a stabilizing and control module; processing the data in the stabilizing and control module and judging whether the power output is needed or not according to a fluctuation power; and in the case of needing power output, outputting a control power instruction and a charge/discharge instruction, and carrying out output by the energy storage system according to the control instruction, wherein electric energy output by the energy storage system passes through PCS (Power Converters), is synthesized with the output of the intermittent type power source through a circuit breaker respectively and merges into a power grid through a transformer. By the adoption of the control method of the hybrid energy storage system for stabilizing the power fluctuation of the intermittent type power source, the defects that when the power fluctuation of the intermittent type power source is stabilized by the prior art, as the energy storage system mainly adopts a single energy storage medium, the ability of stabilizing the power fluctuation of the intermittent type power source is weak and the service life of an energy storage element is shorter are overcome; and therefore, the practicability and the economical efficiency are enhanced.

Description

A kind of mixed energy storage system is stabilized the control method of fitful power power fluctuation
Technical field
The invention belongs to the energy storage technology application, be specifically related to the control method that a kind of mixed energy storage system is stabilized the fitful power power fluctuation.
Background technology
The fluctuation at intermittence that fitful power is intrinsic; cause its scale to be incorporated into the power networks and jeopardize the safety and stability of operation of power networks; electrical network frequency modulation and reserve capacity planning are brought larger challenge, thereby cause present fitful power power station waste of energy phenomenon serious, affected the economic benefit of fitful power.According to existing wind-electricity integration standard, State Standard of the People's Republic of China GB/T19963-2011 " wind energy turbine set access power system technology regulation " and GB/T19964-2011 " photo-voltaic power generation station access power system technology regulation " (exposure draft) by General Administration of Quality Supervision, Inspection and Quarantine o of the People's Republic of China's issue, fitful power active power changes the requirement that should satisfy GB, and active power changes limit value Δ P LimitReference table 1.
Table 1 active power changes the limit value recommendation tables
Energy-storage system be owing to can realize the Time-spatial diversion of electric energy, thereby is considered to stabilize the fitful power power fluctuation, improve the effective means that the electrical network fitful power is admitted ability.Be subjected to the impact of energy storage mechanism, energy type energy-storage system (such as battery) response speed is slow, cycle life is low, is difficult to competent regulation and control to fitful power power high frequency wave component; Power-type energy-storage system (such as ultracapacitor) energy density is low, is difficult to bear the regulation and control to long time scale fitful power power fluctuation.Mixed energy storage system (the energy-storage system that power-type-energy type energy-accumulating medium consists of, Hybrid Energy Storage System, HESS), the advantage such as integrated cycle-index is high, power density is high and capacity is large, solve to a certain extent the problem that independent use power-type or energy type energy-storage system are subjected to the factor restrictions such as energy density and service life, be expected to become effective energy storage form of stabilizing the fitful power power fluctuation.
Summary of the invention
For the deficiencies in the prior art, the present invention proposes the control method that a kind of mixed energy storage system is stabilized the fitful power power fluctuation, overcome prior art when stabilizing the fitful power power fluctuation, energy-storage system adopts single energy-accumulating medium mostly, stabilize a little less than the fitful power power fluctuation ability energy-storage travelling wave tube shorter deficiency in useful life.
A kind of mixed energy storage system provided by the invention is stabilized the control method of fitful power power fluctuation, and its improvements are, by data collecting module collected fitful power realtime power P IE, power supply and energy storage synthesize activity of force P Out, the state-of-charge SOC of battery and the voltage U of ultracapacitor C, data are delivered to stabilize control module; In stabilizing control module, data are processed, judged whether the needs power output according to the size of fluctuating power; When the needs power output, then export power ratio control instruction and charge/discharge instruction, energy-storage system is exerted oneself according to control command, and the electric energy of energy-storage system output is through power converter PCS, exert oneself with fitful power again and synthesize through circuit breaker respectively, be connected to the grid through transformer again.
Preferably, energy-storage system comprises battery and ultracapacitor.
Preferably, the state of exerting oneself of battery energy storage system is divided into:
1. SOC B-min<SOC B<SOC B-max, exert oneself according to the greatest requirements of exerting oneself; Wherein, SOC BState-of-charge for battery; SOC B-minMinimum state-of-charge for battery; SOC B-maxMaximum state-of-charge for battery;
2. SOC B-max<SOC B<1, battery does not charge;
3. 0<SOC B<SOC B-min, battery does not discharge.
Preferably, the state of exerting oneself of super capacitor energy storage system is divided into:
1. U C-b<U C<U C-a, exert oneself according to the greatest requirements of exerting oneself; Wherein, U CVoltage for ultracapacitor; U C-aBe ultracapacitor high voltage limit value; U C-bBe ultracapacitor low-voltage limit value;
2. U C-a<U C<U C-max, the charge power of restriction ultracapacitor; Wherein, U C-maxMaximum voltage for ultracapacitor;
3. U C-min<U C<U C-b, the discharge power of restriction ultracapacitor; Wherein, U C-minMinimum voltage for ultracapacitor;
4. U C-max<U C<1, ultracapacitor does not charge;
5. 0<U C<U C-min, ultracapacitor does not discharge.
Preferably, need to judge whether power output, and when the needs power output, output power ratio control instruction step comprises:
(1) reads in fitful power realtime power data;
(2) judge whether the fitful power power fluctuation before stabilizing satisfies | Δ P IE(t) |<Δ P LimitIf, satisfy, then to exert oneself be 0 to mixed energy storage system, exerting oneself of battery and ultracapacitor also is respectively 0; If do not satisfy and then carry out step (3); Wherein, Δ P Wind(t) be the fitful power power fluctuation before stabilizing, Δ P LimitFor fitful power active power changes limit value;
(3) judge whether the fitful power power fluctuation before stabilizing satisfies Δ P Limit<| Δ P IE(t) |<P HESS-max(t), if satisfy the power output P that then determines energy-storage system according to the size of fitful power power fluctuation HESS(t) value, i.e. P HESS(t)=(1) k(| Δ P IE(t) |-Δ P Limit(t)), when energy storage system discharges, k=0; When energy-storage system charges, k=1; If do not satisfy and then forward step (4) to; Wherein, P HESS-max(t) be the maximum output performance number;
(4) judge whether the fitful power power fluctuation before stabilizing satisfies | Δ P IE(t) |〉P HESS-max(t), exert oneself with maximum power if satisfy then energy-storage system, i.e. P HESS(t)=(1) kP HESS-max(t), P BESS(t)=(1) kP BESS-max(t), P CAP(t)=(1) kP CAP-max(t), when energy storage system discharges, k=0; When energy-storage system charges, k=1; Wherein, P CAP(t) performance number of exporting for ultracapacitor; P CAP-max(t) be ultracapacitor maximum output performance number; P BESS(t) performance number of exporting for battery; P BESS-max(t) maximum power value of exporting for battery; P HESS-max(t) maximum power value of exporting for mixed energy storage system.
Preferably, stabilize the power that discharges and recharges that control module adopts low-pass filtering algorithm assigns battery and ultracapacitor.
Preferably, when energy storage system discharges, the control procedure of power division of stabilizing control module is as follows:
1) reads in the total discharge power P of mixed energy storage system HESS(t), process Butterworth low-pass filtering gets output power value P after getting filtering D(t);
2) judge SOC B>SOC B-minWhether, be then carry out step 3) if setting up; Otherwise enter step 5).
3) judge U C>U C-bWhether set up, be then to distribute battery and ultracapacitor to exert oneself to be P BESS(t)=P D(t), P CAP(t)=P HESS-P BESSOtherwise enter step 4);
4) judge U C-min<U C<U C-bWhether set up, be then to distribute battery and ultracapacitor to exert oneself to be P BESS(t)=max ((1+ α) P D(t), P BESS-max(t)), P CAP(t)=P HESS-P BESS, be P otherwise distribute battery and ultracapacitor to exert oneself BESS(t)=max (P HESS(t), P BESS-max(t)), P CAP(t)=0; Wherein α is battery compensation power factor, α = U C - b - U C U C - b - U C - min · P HESS ( t ) - P D ( t ) P D ( t ) ;
5) judge U C>U C-minWhether set up, be then to distribute battery and ultracapacitor to exert oneself to be P BESS(t)=0, P CAP(t)=max (P HESS(t), P CAP-max(t)); Be P otherwise distribute battery and ultracapacitor to exert oneself BESS(t)=0, P CAP(t)=0.
Preferably, when energy-storage system charged, the control procedure of power division of stabilizing control module was as follows:
1) reads in the total charge power P of mixed energy storage system HESS(t), process Butterworth low-pass filtering must power output be P after getting filtering D(t);
2) judge SOC B<SOC B-maxWhether, be then carry out step 3) if setting up; Otherwise enter step 5);
3) judge U C<U C-aWhether set up, be then to distribute battery and ultracapacitor to exert oneself to be P BESS(t)=P D(t), P CAP(t)=P HESS-P BESSOtherwise enter step 4);
4) judge U C<U C-maxWhether set up, be then to distribute battery and ultracapacitor to exert oneself to be P BESS(t)=max ((1+ α) P D(t), P BESS-max(t)), P CAP(t)=P HESS-P BESSBe P otherwise distribute battery and ultracapacitor to exert oneself BESS(t)=max (P HESS(t), P BESS-max(t)), P CAP(t)=0;
5) judge U C<U C-maxWhether set up, be then to distribute battery and ultracapacitor to exert oneself to be P BESS(t)=0, P CAP(t)=max (P HESS(t), P CAP-max(t)); Be P otherwise distribute battery and ultracapacitor to exert oneself BESS(t)=0, P CAP(t)=0.
Compared with the prior art, beneficial effect of the present invention is:
The present invention is divided into fitful power power to meet and is incorporated into the power networks GB and does not meet the GB two large classes that are incorporated into the power networks, only stabilize for the fitful power power section that does not meet the GB that is incorporated into the power networks, under safe prerequisite is incorporated into the power networks in assurance, reduced the stored energy capacitance of required configuration, reduce energy storage and discharged and recharged number of times, thereby improved economy.
The present invention adopts Butterworth low-pass filtering method to calculate level and smooth power output, compares existing digital filter method, has reduced frequently discharging and recharging of hysteresis effect and energy storage.
The present invention makes up new topology, and energy type energy storage and power-type energy storage are separated, and is through PCS converter access electrical network, more flexible to the control of mixed energy storage system respectively.
The flow chart that the present invention is detailed and quantitative formula realize that details is more clear, have realized calculating accurately the target of benefit optimum.
When power fluctuation is excessive when exceeding the energy storage peak power output, generally do not stabilize in the prior art, the present invention is directed to this situation be designed to battery and ultracapacitor is exerted oneself with maximum power, lower powered fluctuation is fallen as far as possible.
Higher and need charging as energy storage SOC, or energy storage SOC is lower and when needing discharge, generally continue in the prior art to discharge and recharge, but the present invention runs into above-mentioned situation, will stop to exert oneself, prevented from that " overcharging " " puts " deeply can cause larger injury to energy-storage system.
The present invention to be stabilizing fitful power fluctuation as the control target, discharges and recharges power, the power output of reasonable distribution battery and ultracapacitor by regulation and control HESS.Take full advantage of the large characteristics of battery capacity, make it bear mixed energy storage system and always discharge and recharge power medium and low frequency fluctuation part, take full advantage of its characteristics capacious, reduce it and discharge and recharge number of times; And ultracapacitor is born HESS and is is always discharged and recharged the fast sex change of power medium-high frequency fluctuation part, meet the characteristic that its power density is large, have extended cycle life, and desired volume is unlikely to too high.Remedy independent a kind of energy-accumulating medium stabilize the fluctuation ability weak, use the shortcomings such as useful life is short, optimize the operational effect of power supply and energy storage association system.
Description of drawings
Fig. 1 is that energy-storage system provided by the invention is stabilized fitful power fluctuation control block diagram;
Fig. 2 is that the state of exerting oneself of battery provided by the invention and ultracapacitor is divided schematic diagram;
Fig. 3 is that energy-storage system provided by the invention always discharges and recharges the power control flow chart;
Power division control flow chart when Fig. 4 is energy storage system discharges provided by the invention;
Power division control flow chart when Fig. 5 is energy-storage system charging provided by the invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
The present invention adopts battery and ultracapacitor to consist of mixed energy storage system, according to fitful power power fluctuation degree, judges whether mixed energy storage system takes efforts, and determines that two kinds of energy-accumulating mediums go out the size of activity of force separately.Take into account simultaneously energy-storage system SOC(State Of Charge, state-of-charge) level, prevent overcharging or the over-discharge can situation of energy-storage system, thereby ensure the energy-storage system safe and stable operation.
Fig. 1 is that mixed energy storage system is stabilized fitful power fluctuation control block diagram.As shown in Figure 1, the present invention is by data collecting module collected fitful power realtime power P IE, power supply and energy storage synthesize activity of force P OutAnd the voltage U of the SOC of battery and ultracapacitor C, data are delivered to stabilize control module, in stabilizing control module, data are processed, according to the size of fluctuating power judge whether to exert oneself (being power output).When taking efforts, stabilize control module output power ratio control instruction and charge/discharge instruction, battery/super capacitor energy storage system (HESS) is exerted oneself according to control command, the electric energy of energy-storage system output is through power converter PCS, exert oneself with fitful power again and synthesize through circuit breaker respectively, be connected to the grid through transformer again.
Wherein, energy-storage system comprises battery and ultracapacitor, for realizing the coordination control of battery and ultracapacitor, according to the SOC of battery BVoltage U with ultracapacitor CThe state of exerting oneself to energy storage device is divided, as shown in Figure 2:
The state of exerting oneself of battery is divided into:
1. SOC B-min<SOC B<SOC B-max, exert oneself according to the greatest requirements of exerting oneself in the normal region; Wherein, SOC BState-of-charge for battery; SOC B-minMinimum state-of-charge for battery; SOC B-maxMaximum state-of-charge for battery;
2. SOC B-max<SOC B<1, the charging warning region, for preventing overcharging, battery does not recharge;
3. 0<SOC B<SOC B-min, the discharge warning region, for preventing over-discharge can, battery no longer discharges.
The state of exerting oneself of ultracapacitor is divided into:
1. U C-b<U C<U C-a, exert oneself according to the greatest requirements of exerting oneself in the normal region; Wherein, U CVoltage for ultracapacitor; U C-aBe ultracapacitor high voltage limit value; U C-bBe ultracapacitor low-voltage limit value;
2. U C-a<U C<U C-max, charging restricted area, the charge power of restriction ultracapacitor; Wherein, U C-maxFor being the maximum voltage of ultracapacitor;
3. U C-min<U C<U C-b, discharge restricted area, the discharge power of restriction ultracapacitor; Wherein, U C-maxFor being the minimum voltage of ultracapacitor;
4. U C-max<U C<1, the charging warning region, for preventing overcharging, ultracapacitor does not recharge;
5. 0<U C<U C-min, the discharge warning region, for preventing over-discharge can, ultracapacitor no longer discharges.
During enforcement, the present embodiment is established t, and constantly to stabilize front fitful power field power output through energy-storage system be P IE(t), stabilizing rear power supply and energy storage, to unite activity of force be P Out(t), then stabilizing front fitful power power fluctuation is Δ P IE(t)=P IE(t)-P Out(t-1).Stabilizes control module and need to judge whether power output, and when the needs power output, the flow chart of output power ratio control instruction specifically comprises as shown in Figure 3:
(1) reads in fitful power realtime power data.
(2) judge whether the fitful power power fluctuation satisfies condition | Δ P IE(t) |<Δ P LimitIf satisfy condition, then the fitful power power fluctuation is less, satisfies the requirement of being incorporated into the power networks, and it is 0 that energy-storage system always charges and discharge power, i.e. P HESS(t)=0, P BESS(t)=0, P CAP(t)=0; If do not satisfy condition, then the fitful power power fluctuation is larger, forwards step (3) to; Wherein, | Δ P IE(t) | be the fitful power power fluctuation before stabilizing, Δ P LimitFor fitful power active power changes limit value.
(3) as | Δ P IE(t) |>Δ P LimitThe time, judge whether to satisfy condition | Δ P IE(t) |<P HESS-max(t).If satisfy condition, then HESS can stabilize the fitful power power fluctuation to the impact of electrical network, and less than HESS maximum output power, determines P according to fitful power power fluctuation actual conditions HESS(t) value, i.e. P HESS(t)=(1) k(| Δ P IE(t) |-Δ P Limit), when HESS discharges, k=0.When HESS charges, k=1.If do not satisfy condition, then forward step (4) to; Wherein, P HESS-max(t) be the maximum output performance number.
(4) as | Δ P IE(t) |>P HESS-max(t) time, the active power undulating value of fitful power output is greater than HESS maximum output power.The negative effect that electrical network is produced in order to weaken the fitful power power fluctuation as far as possible, this moment, HESS exerted oneself with maximum power, i.e. P HESS(t)=(1) kP HESS-max(t), P BESS(t)=(1) kP BESS-max(t), P CAP(t)=(1) kP CAP-max(t), when HESS discharges, k=0; When HESS charges, k=1; Wherein, P CAP(t) performance number of exporting for ultracapacitor; P CAP-max(t) be ultracapacitor maximum output performance number; P BESS(t) performance number of exporting for battery; P BESS-max(t) maximum power value of exporting for battery; P HESS-max(t) maximum power value of exporting for mixed energy storage system.
The response time difference of considering battery and ultracapacitor is large (take lithium ion battery as example, the response time rank of lithium ion is 100ms, ultracapacitor response time rank is 1ms), take into account simultaneously the state-of-charge of battery and the voltage of ultracapacitor, the present embodiment adopts the power that discharges and recharges of low-pass filtering algorithm assigns battery and ultracapacitor, with extension device useful life.
When Fig. 4 is energy storage system discharges, battery and ultracapacitor power division control flow chart, its step comprises:
1) reads in the total discharge power P of mixed energy storage system HESS(t), process Butterworth low-pass filtering must power output be P after getting filtering D(t).
2) judge SOC B>SOC B-minWhether set up, set up and then change step 3 over to); Then change step 5 over to if be false).
3) work as SOC B>SOC B-minThe time, battery energy storage is in the regular picture zone.Judge U C>U C-bWhether set up, set up then that ultracapacitor is in the regular picture zone, battery and ultracapacitor are exerted oneself and are P BESS(t)=P D(t), P CAP(t)=P HESS-P BESSThen change step 4 over to if be false).
4) judge U C-min<U C<U C-bWhether set up:
If 1. set up, then ultracapacitor is in the discharge restricted area, battery is born the more task of exerting oneself, and battery and ultracapacitor are exerted oneself and be P BESS(t)=max ((1+ α) P D(t), P BESS-max(t)), P CAP(t)=P HESS-P BESS, wherein α is battery compensation power factor, α = U C - b - U C U C - b - U C - min · P HESS ( t ) - P D ( t ) P D ( t ) ;
If 2. be false, then ultracapacitor is in the discharge warning region, under the prerequisite of considering power of battery ability, make the battery task of exerting oneself of bearing as much as possible, and battery and ultracapacitor are exerted oneself and be P BESS(t)=max (P HESS(t), P BESS-max(t)), P CAP(t)=0, P wherein BESS-max(t) be the peak power output of battery.
5) work as SOC B<SOC B-minThe time, battery energy storage is in the discharge warning region, does not bear the task of exerting oneself.Judge U C>U C-minWhether set up:
If 1. set up, then ultracapacitor is in the absence of discharge warning region, the ultracapacitor task of exerting oneself of bearing as much as possible, and battery and ultracapacitor are exerted oneself and are P BESS(t)=0, P CAP(t)=max (P HESS(t), P CAP-max(t)), P wherein CAP-max(t) be the peak power output of ultracapacitor;
If 2. be false, then battery and ultracapacitor all are in the discharge warning region, can not bear the task of exerting oneself, and battery and ultracapacitor are exerted oneself and be P BESS(t)=0, P CAP(t)=0.
When Fig. 5 is the energy-storage system charging, battery and ultracapacitor power division control flow chart, its step comprises:
1) reads in the total charge power P of mixed energy storage system HESS(t), process Butterworth low-pass filtering must power output be P after getting filtering D(t).
2) judge SOC B<SOC B-maxWhether set up, set up and then change step 3 over to); Then change step 5 over to if be false).
3) work as SOC B<SOC B-maxThe time, battery energy storage is in normally to put and fills the zone.Judge U C<U C-aWhether set up, set up then ultracapacitor and be in and charge normal the zone, battery and ultracapacitor are exerted oneself and are P BESS(t)=P D(t), P CAP(t)=P HESS-P BESSThen change step 4 over to if be false).
4) judge U C<U C-maxWhether set up:
If 1. set up, then ultracapacitor is in the charging restricted area, battery is born the more task of exerting oneself, and battery and ultracapacitor are exerted oneself and be P BESS(t)=max ((1+ α) P D(t), P BESS-max(t)), P CAP(t)=P HESS-P BESS, wherein α is battery compensation power factor, α = U C - b - U C U C - b - U C - min · P HESS ( t ) - P D ( t ) P D ( t ) ;
If 2. be false, then ultracapacitor is in the charging warning region, under the prerequisite of considering power of battery ability, make the battery task of exerting oneself of bearing as much as possible, and battery and ultracapacitor are exerted oneself and be P BESS(t)=max (P HESS(t), P BESS-max(t)), P CAP(t)=0.
5) work as SOC B>SOC B-maxThe time, battery energy storage is in the charging warning region, does not bear the task of exerting oneself.Judge U C<U C-maxWhether set up:
If 1. set up, then ultracapacitor is in non-charging warning region, the ultracapacitor task of exerting oneself of bearing as much as possible, and battery and ultracapacitor are exerted oneself and are P BESS(t)=0, P CAP(t)=max (P HESS(t), P CAP-max(t));
If 2. be false, then battery and ultracapacitor all are in the charging warning region, can not bear the task of exerting oneself, and battery and ultracapacitor are exerted oneself and be P BESS(t)=0, P CAP(t)=0.
Above step, by the exert oneself state-of-charge of watt level and current time battery and the voltage of ultracapacitor of real-time judge HESS, satisfying condition according to it changes the power that discharges and recharges of two kinds of energy-accumulating mediums between above state.Battery has been born HESS and has been gone out activity of force medium and low frequency fluctuation part, reduces it and discharges and recharges number of times, meets the high characteristic of its energy density; And ultracapacitor is born energy-storage system and is gone out the fast sex change of activity of force medium-high frequency fluctuation part, meet the characteristic of its power density, and desired volume is unlikely to too high.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (8)

1. a mixed energy storage system is stabilized the control method of fitful power power fluctuation, it is characterized in that, by data collecting module collected fitful power realtime power P IE, power supply and energy storage synthesize activity of force P Out, the state-of-charge SOC of battery and the voltage U of ultracapacitor C, data are delivered to stabilize control module; After in stabilizing control module, data being processed, judge whether the needs power output according to the size of fluctuating power; When the needs power output, then export power ratio control instruction and charge/discharge instruction, energy-storage system is exerted oneself according to control command, and the electric energy of energy-storage system output is through power converter PCS, exert oneself with fitful power again and synthesize through circuit breaker respectively, be connected to the grid through transformer again.
2. control method as claimed in claim 1 is characterized in that, energy-storage system comprises battery and ultracapacitor.
3. control method as claimed in claim 2 is characterized in that, the state of exerting oneself of battery energy storage system is divided into:
1. SOC B-min<SOC B<SOC B-max, exert oneself according to the greatest requirements of exerting oneself; Wherein, SOC BState-of-charge for battery; SOC B-minMinimum state-of-charge for battery; SOC B-maxMaximum state-of-charge for battery;
2. SOC B-max<SOC B<1, battery does not charge;
3. 0<SOC B<SOC B-min, battery does not discharge.
4. control method as claimed in claim 2 is characterized in that, the state of exerting oneself of super capacitor energy storage system is divided into:
1. U C-b<U C<U C-a, exert oneself according to the greatest requirements of exerting oneself; Wherein, U CVoltage for ultracapacitor; U C-aBe ultracapacitor high voltage limit value; U C-bBe ultracapacitor low-voltage limit value;
2. U C-a<U C<U C-max, the charge power of restriction ultracapacitor; Wherein, U C-maxMaximum voltage for ultracapacitor;
3. U C-min<U C<U C-b, the discharge power of restriction ultracapacitor; Wherein, U C-minMinimum voltage for ultracapacitor;
4. U C-max<U C<1, ultracapacitor does not charge;
5. 0<U C<U C-min, ultracapacitor does not discharge.
5. control method as claimed in claim 1 is characterized in that, need to judge whether power output, and when the needs power output, output power ratio control instruction step comprises:
(1) reads in fitful power realtime power data;
(2) judge whether the fitful power power fluctuation before stabilizing satisfies | Δ P IE(t) |<Δ P LimitIf, satisfy, then to exert oneself be 0 to mixed energy storage system, exerting oneself of battery and ultracapacitor also is respectively 0; If do not satisfy and then carry out step (3); Wherein, | Δ P IE(t) | be the fitful power power fluctuation before stabilizing, Δ P LimitFor fitful power active power changes limit value;
(3) judge whether the fitful power power fluctuation before stabilizing satisfies Δ P Limit<| Δ P IE(t) |<P HESS-max(t), if satisfy the power output P that then determines energy-storage system according to the size of fitful power power fluctuation HESS(t) value, i.e. P HESS(t)=(1) k(| Δ P IE(t) |-Δ P Limit(t)), when energy storage system discharges, k=0; When energy-storage system charges, k=1; If do not satisfy and then forward step (4) to; Wherein, P HESS-max(t) be the maximum output performance number;
(4) judge whether the fitful power power fluctuation before stabilizing satisfies | Δ P IE(t) |〉P HESS-max(t), exert oneself with maximum power if satisfy then energy-storage system, i.e. P HESS(t)=(1) kP HESS-max(t), P BESS(t)=(1) kP BESS-max(t), P CAP(t)=(1) kP CAP-max(t), when energy storage system discharges, k=0; When energy-storage system charges, k=1; Wherein, P CAP(t) performance number of exporting for ultracapacitor; P CAP-max(t) be ultracapacitor maximum output performance number; P BESS(t) performance number of exporting for battery; P BESS-max(t) maximum power value of exporting for battery; P HESS-max(t) maximum power value of exporting for mixed energy storage system.
6. control method as claimed in claim 1 is characterized in that, stabilizes the power that discharges and recharges that control module adopts low-pass filtering algorithm assigns battery and ultracapacitor.
7. control method as claimed in claim 1 is characterized in that, when energy storage system discharges, the control procedure of power division of stabilizing control module is as follows:
1) reads in the total discharge power P of mixed energy storage system HESS(t), process Butterworth low-pass filtering gets output power value P after getting filtering D(t);
2) judge SOC B>SOC B-minWhether, be then carry out step 3) if setting up; Otherwise enter step 5).
3) judge U C>U C-bWhether set up, be then to distribute battery and ultracapacitor to exert oneself to be P BESS(t)=P D(t), P CAP(t)=P HESS-P BESSOtherwise enter step 4);
4) judge U C-min<U C<U C-bWhether set up, be then to distribute battery and ultracapacitor to exert oneself to be P BESS(t)=max ((1+ α) P D(t), P BESS-max(t)), P CAP(t)=P HESS-P BESS, be P otherwise distribute battery and ultracapacitor to exert oneself BESS(t)=max (P HESS(t), P BESS-max(t)), P CAP(t)=0; Wherein α is battery compensation power factor, α = U C - b - U C U C - b - U C - min · P HESS ( t ) - P D ( t ) P D ( t ) ;
5) judge U C>U C-minWhether set up, be then to distribute battery and ultracapacitor to exert oneself to be P BESS(t)=0, P CAP(t)=max (P HESS(t), P CAP-max(t)); Be P otherwise distribute battery and ultracapacitor to exert oneself BESS(t)=0, P CAP(t)=0.
8. control method as claimed in claim 1 is characterized in that, when energy-storage system charged, the control procedure of power division of stabilizing control module was as follows:
1) reads in the total charge power P of mixed energy storage system HESS(t), process Butterworth low-pass filtering must power output be P after getting filtering D(t);
2) judge SOC B<SOC B-maxWhether, be then carry out step 3) if setting up; Otherwise enter step 5);
3) judge U C<U C-aWhether set up, be then to distribute battery and ultracapacitor to exert oneself to be P BESS(t)=P D(t), P CAP(t)=P HESS-P BESSOtherwise enter step 4);
4) judge U C<U C-maxWhether set up, be then to distribute battery and ultracapacitor to exert oneself to be P BESS(t)=max ((1+ α) P D(t), P BESS-max(t)), P CAP(t)=P HESS-P BESSBe P otherwise distribute battery and ultracapacitor to exert oneself BESS(t)=max (P HESS(t), P BESS-max(t)), P CAP(t)=0;
5) judge U C<U C-maxWhether set up, be then to distribute battery and ultracapacitor to exert oneself to be P BESS(t)=0, P CAP(t)=max (P HESS(t), P CAP-max(t)); Be P otherwise distribute battery and ultracapacitor to exert oneself BESS(t)=0, P CAP(t)=0.
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