CN102496949A - Method and system capable of optimizing and controlling micro-network energy-storage system - Google Patents
Method and system capable of optimizing and controlling micro-network energy-storage system Download PDFInfo
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- CN102496949A CN102496949A CN201110430413XA CN201110430413A CN102496949A CN 102496949 A CN102496949 A CN 102496949A CN 201110430413X A CN201110430413X A CN 201110430413XA CN 201110430413 A CN201110430413 A CN 201110430413A CN 102496949 A CN102496949 A CN 102496949A
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention belongs to the field of power distribution network scheduling and management, and provides a method and a system capable of optimizing and controlling a micro-network energy-storage system. In full consideration of a distributed power supply and the characteristics of the energy-storage system, through real-time data monitoring for the active power outputted by a photovoltaic power generation system and a wind power generation system as well as the active power of the storage battery terminal voltage and the energy-storage system, combined with user' side requirement response, the requirement for stabilizing power network power and projection data of electricity utilization load, the optimization and control for the energy-storage system are realized, so the requirement of a micro-network system power balance is met, the impact on an external power network from the micro-network system is reduced, safe operation of the whole power network is ensured, the requirement of the micro-network system stabilizing the power network power fluctuation and the requirement of demand side response are met, the operation time of the micro-network system in an insulted inland is greatly prolonged, the service life of the storage battery is prolonged, and the operating stability, compatibility and economical efficiency of the micro-network are improved. Therefore, the invention has better practical significance for the popularization and application of the energy-storage system in the micro network.
Description
Technical field
The invention belongs to power distribution network scheduling and management domain, relate in particular to a kind of method and system that are used for the microgrid energy-storage system is optimized control.
Background technology
Present microgrid energy-storage system is perfect inadequately in controlling schemes, and under the pattern that is incorporated into the power networks, the deficiency of real time data monitoring, generated output and power load prediction makes and very easily causes the grid power fluctuation, electrical network is impacted; Under the islet operation pattern, voltage reference source when the batteries to store energy system is operation, control microgrid frequency and voltage keep constant; There is the reasonability problem in existing microgrid energy-storage system in controlling schemes, if generated output, can cause batteries to store energy system inverse probability greater than load power; Influence the stable operation of microgrid system; If generated output too less than load power, can cause the batteries discharging current to be far longer than optimum discharging current, thereby greatly shortened the time that piconet island moves; And the useful life that can reduce batteries, increase the maintenance investment of system.
Summary of the invention
The invention provides a kind of method and system that are used for the microgrid energy-storage system is optimized control, be intended to solve microgrid energy-storage system that prior art provides under the pattern of being incorporated into the power networks, very easily cause the grid power fluctuation, electrical network is impacted; Under the islet operation pattern; Also exist energy-storage system inverse probability, batteries discharging current to be far longer than problems such as optimum discharging current; Influence the microgrid system stable operation, shortened time of piconet island operation; And the useful life that can reduce batteries, increase the problem that system maintenance is invested.
The object of the present invention is to provide a kind of method that is used for the microgrid energy-storage system is optimized control, this method may further comprise the steps:
Operational mode to microgrid system and external electrical network is judged;
When microgrid system and external electrical network when being incorporated into the power networks pattern, control mode is controlled energy-storage system according to being incorporated into the power networks;
When microgrid system and external electrical network are the islet operation pattern, energy-storage system is controlled according to the islet operation control mode.
Another object of the present invention is to provide a kind of system that is used for the microgrid energy-storage system is optimized control, this system comprises:
The operational mode judge module is used for the operational mode of microgrid system and external electrical network is judged;
The control module that is incorporated into the power networks, be used for when microgrid system and external electrical network when being incorporated into the power networks pattern, control mode is controlled energy-storage system according to being incorporated into the power networks;
The islet operation control module is used for when microgrid system and external electrical network are the islet operation pattern, according to the islet operation control mode energy-storage system being controlled.
The method and system that are used for the microgrid energy-storage system is optimized control provided by the invention; On the basis that takes into full account distributed power source and the characteristics of energy-storage system own, through to the monitoring of the real time data of photovoltaic generating system, wind generator system active power of output and accumulator voltage, energy-storage system active power, in conjunction with the user side demand response, stabilize the requirement of grid power and the prediction data of power load; Energy-storage system is optimized control; Satisfied the requirement of microgrid system power balance, reduced of the impact of microgrid system, guaranteed whole electric power netting safe running external electrical network; Satisfy the microgrid system and stabilize the requirement of grid power fluctuation, Demand Side Response; Greatly prolong simultaneously the time of piconet island operation, in the useful life of having improved batteries, reduced the maintenance investment of microgrid system; Improved its stability, compatibility and economy, the promotion and application in microgrid have practical significance preferably to energy-storage system.
Description of drawings
Fig. 1 shows the realization flow figure that is used for the microgrid energy-storage system is optimized the method for control that the embodiment of the invention provides;
Fig. 2 shows the realization flow figure of the control mode that is incorporated into the power networks that the embodiment of the invention provides;
Fig. 3 shows the realization flow figure of the islet operation control mode that the embodiment of the invention provides;
The flow chart of the implementation method that the energy-storage battery that Fig. 4 shows the embodiment of the invention to be provided charges;
Fig. 5 shows the structured flowchart that is used for the microgrid energy-storage system is optimized the system of control that the embodiment of the invention provides.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further specified below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in the qualification invention.
Fig. 1 shows the realization flow that is used for the microgrid energy-storage system is optimized the method for control that the embodiment of the invention provides.
This method may further comprise the steps:
In step S101, the operational mode of microgrid system and external electrical network is judged;
In step S102, when microgrid system and external electrical network when being incorporated into the power networks pattern, control mode is controlled energy-storage system according to being incorporated into the power networks;
In step S103, when microgrid system and external electrical network are the islet operation pattern, energy-storage system is controlled according to the islet operation control mode.
As shown in Figure 2, in embodiments of the present invention, the control mode that is incorporated into the power networks may further comprise the steps:
Set exchange power lower limit M1 and exchange power upper limit and M2 that microgrid system and external electrical network allow, and exchange power lower limit M1＜exchange power upper limit M2;
The exchange power M3 of monitoring in real time and acquisition microgrid system and external electrical network and external electrical network are to the transmitted power M4 of microgrid system;
When exchange power M3 is between exchange power lower limit M1 and exchange power upper limit M2, energy-storage system is not carried out any adjusting;
When exchange power M3 not between between exchange power lower limit M1 and the exchange power upper limit M2 and external electrical network during to the transmitted power M4 of microgrid system≤0, judge whether storage battery is full of;
When storage battery is full of electricity, be that target is charged then according to load and generating predicted power excision photovoltaic generating system and wind generator system, and with the zero energy;
When storage battery underfill electricity, then be that target is charged with the zero energy;
When exchange power M3 not between between exchange power lower limit M1 and the exchange power upper limit M2 and external electrical network during to the transmitted power M4 of microgrid system＞0, judge whether storage battery has reached the discharge limit;
Prescribe a time limit when storage battery has reached discharge electrode, then storage battery gets into holding state, and allows photovoltaic generating system and wind generator system generating according to intensity of illumination and wind speed;
When storage battery does not reach discharge electrode in limited time, then be that target is discharged with the zero energy.
As shown in Figure 3, in embodiments of the present invention, the islet operation control mode may further comprise the steps:
When the frequency that monitors the microgrid system is lower than 49.9HZ, photovoltaic generating system, wind generator system, storage battery and load operation situation are coordinated accordingly, controlled;
When the frequency that monitors the microgrid system is higher than 50.1HZ, the working condition of photovoltaic generating system, wind generator system, storage battery and load is coordinated accordingly, controlled.
In embodiments of the present invention, when the frequency that monitors the microgrid system is lower than 49.9HZ, the coordination of storage battery, control may further comprise the steps:
According to real-time Monitoring Data, obtain the power sagging curve of storage battery to storage battery;
Set the voltage atdischarge end and the maximum discharge current of storage battery, monitor the actual terminal voltage of storage battery in real time;
When the actual terminal voltage that monitors storage battery during, then the power output of wind generator system and photovoltaic generating system is monitored, controlled less than the voltage atdischarge end set;
When the actual terminal voltage that monitors storage battery during, according to the actual discharge electric current of the power sagging curve calculating accumulator of storage battery greater than the voltage atdischarge end set;
When the actual discharge electric current of storage battery during, then continue the frequency of microgrid system is monitored less than maximum discharge current;
When actual discharge electric current during greater than maximum discharge current, then control storage battery and discharge with maximum discharge current, simultaneously the power output of wind generator system and photovoltaic generating system is monitored, controlled.
In embodiments of the present invention, when the frequency that monitors the microgrid system is lower than 49.9HZ, the coordination of wind generator system, control may further comprise the steps:
Set the peak power output of wind generator system, monitor the real output of wind generator system in real time;
When the real output of wind generator system equals peak power output, then the power output of photovoltaic generating system is monitored, controlled;
When the real output of wind generator system during, then increase the real output of wind generator system less than peak power output;
When the power output of storage battery and wind generator system satisfies requiring of total load, then continue the frequency of microgrid system is monitored;
When the power output of storage battery and wind generator system can not satisfy requiring of total load, then the power output of photovoltaic generating system is monitored, controlled.
In embodiments of the present invention, when the frequency that monitors the microgrid system is lower than 49.9HZ, the coordination of photovoltaic generating system, control may further comprise the steps:
Set the peak power output of photovoltaic generating system, monitor the real output of photovoltaic generating system in real time;
When the real output of photovoltaic generating system equaled peak power output, then excision is corresponding loaded;
When the real output of photovoltaic generating system during, then increase the real output of photovoltaic generating system less than peak power output;
When the power output of storage battery, wind generator system and photovoltaic generating system satisfies requiring of total load, then continue the frequency of microgrid system is monitored;
When the power output of storage battery, wind generator system and photovoltaic generating system can not satisfy requiring of total load, then excision is corresponding loaded.
As shown in Figure 4, in embodiments of the present invention, the implementation method that energy-storage battery is charged is:
In step S401, charge parameter voltage U 1, voltage U 2, voltage U 3, electric current I, time T are set, and voltage U 1＜voltage U 2, voltage U 2＜voltage U 3;
In step S402, according to running situation to charge parameter voltage U 1, voltage U 2, voltage U 3, electric current I, time T is dynamically controlled and revise, two-way inverter is selected with reference to the charge parameter that is provided with and according to the current state-of-charge of storage battery automatically;
In step S403, when storage battery need not cause voltage to be lower than voltage U 1 for a long time, get into the preliminary filling stage, according to little electric current constant current charge;
In step S404, when battery tension is higher than voltage U 2 and is lower than voltage U 3, get into and fill the stage soon, carry out big electric current constant current pressure limiting charging according to 0.1C;
In step S405, when battery tension is higher than voltage U 3, gets into and all fill the stage, charge according to the constant voltage and current limiting mode;
In step S406, all filling the stage, when charging current is lower than electric current I, get into the floating charge stage, carry out constant current pressure limiting charging according to little electric current;
In step S407, when the floating charge process reached setting-up time T, storage battery was full of, and changed holding state over to.
Fig. 5 shows the structure that is used for the microgrid energy-storage system is optimized the system of control that the embodiment of the invention provides.For the ease of explanation, only show the part relevant with the present invention.
This system comprises:
Operational mode judge module 51 is used for the operational mode of microgrid system and external electrical network is judged;
The control module 52 that is incorporated into the power networks, be used for when microgrid system and external electrical network when being incorporated into the power networks pattern, control mode is controlled energy-storage system according to being incorporated into the power networks;
Islet operation control module 53 is used for when microgrid system and external electrical network are the islet operation pattern, according to the islet operation control mode energy-storage system being controlled.
In embodiments of the present invention, the control module 52 that is incorporated into the power networks further comprises:
The photovoltaic generating system regulation and control unit 521 that is incorporated into the power networks is used for when microgrid system and external electrical network are incorporated into the power networks, the working condition of photovoltaic generating system being coordinated accordingly, being controlled;
The wind generator system regulation and control unit 522 that is incorporated into the power networks is used for when microgrid system and external electrical network are incorporated into the power networks, the working condition of wind generator system being coordinated accordingly, being controlled;
Storage battery grid-connected regulation and control unit 523 is used for when microgrid system and external electrical network are incorporated into the power networks, the working condition of storage battery being coordinated accordingly, being controlled;
The load regulation and control unit 524 that is incorporated into the power networks is used for when microgrid system and external electrical network are incorporated into the power networks, load being coordinated accordingly, being controlled;
Islet operation control module 53 further comprises:
The first islet operation control module 531 is used for when the frequency that monitors the microgrid system is lower than 49.9HZ, and photovoltaic generating system, wind generator system, storage battery and load operation situation are coordinated accordingly, controlled;
The second islet operation control module 532 is used for when the frequency that monitors the microgrid system is higher than 50.1HZ, the working condition of photovoltaic generating system, wind generator system, storage battery and load being coordinated accordingly, being controlled.
In embodiments of the present invention, the first islet operation control module 531 further comprises:
First photovoltaic generating system isolated island regulation and control unit 5311 is used for when the frequency that monitors the microgrid system is lower than 49.9HZ, the working condition of photovoltaic generating system being coordinated accordingly, being controlled;
First wind generator system isolated island regulation and control unit 5312 is used for when the frequency that monitors the microgrid system is lower than 49.9HZ, the working condition of wind generator system being coordinated accordingly, being controlled;
First storage battery isolated island regulation and control unit 5313 is used for when the frequency that monitors the microgrid system is lower than 49.9HZ, the working condition of storage battery being coordinated accordingly, being controlled;
The first load isolated island regulation and control unit 5314 is used for when the frequency that monitors the microgrid system is lower than 49.9HZ, load being coordinated accordingly, being controlled;
The second islet operation control module 532 further comprises:
Second photovoltaic generating system isolated island regulation and control unit 5321 is used for when the frequency that monitors the microgrid system is higher than 50.1HZ, the working condition of photovoltaic generating system being coordinated accordingly, being controlled;
Second wind generator system isolated island regulation and control unit 5322 is used for when the frequency that monitors the microgrid system is higher than 50.1HZ, the working condition of wind generator system being coordinated accordingly, being controlled;
Second storage battery isolated island regulation and control unit 5323 is used for when the frequency that monitors the microgrid system is higher than 50.1HZ, the working condition of storage battery being coordinated accordingly, being controlled;
The second load isolated island regulation and control unit 5324 is used for when the frequency that monitors the microgrid system is higher than 50.1HZ, load being coordinated accordingly, being controlled.
Below in conjunction with accompanying drawing and specific embodiment application principle of the present invention is further described.
The method and system that are used for the microgrid energy-storage system is optimized control that the embodiment of the invention provides; Overcome the present deficiency of microgrid energy-storage system on reasonability, stability; Characteristics in view of distributed power source and energy-storage system itself; The present invention is through the monitoring to real time datas such as photovoltaic generating system, wind generator system active power of output and accumulator voltage, energy-storage system active power; In conjunction with the user side demand response, stabilize the requirement of grid power and the prediction data of power load, energy-storage system is optimized control, to satisfy the requirement of microgrid system power balance.
When microgrid is incorporated into the power networks; Energy-storage system controlling schemes flow chart is as shown in Figure 1, and (annotate: M1 and M2 are respectively the lower limit and the upper limit of electrical network and microgrid permission exchange power; Exchange power does not carry out any adjusting to system between this); When the output of wind generator system and photovoltaic generating system generating generating gross power is big, energy-storage battery is charged; In the output of wind generator system and photovoltaic generating system generating gross power hour, energy-storage battery is to system discharge; Power curve choose reasonable according to according to energy-storage battery capacity and prediction wind generator system and photovoltaic generating system generating discharges and recharges the interval; It is stable to keep gross output as far as possible for a long time; Reduce the frequency that discharges and recharges of energy-storage battery as far as possible; Be that discharging and recharging of energy-storage battery adjust frequency can not be too big, otherwise can influence the useful life of battery.
During the piconet island operation, energy-storage system controlling schemes flow chart is as shown in Figure 2.
Energy-storage system is incorporated into the power networks and discharges and recharges control algolithm
Under the charged state that is incorporated into the power networks, storage battery is charged through the ac bus absorption is meritorious; And can dynamic reactive be provided according to the electrical network needs.The charging control of being incorporated into the power networks is divided into preliminary filling, fills soon, all fills and the floating charge four-stage, and two-way inverter is provided with according to the current state-of-charge of battery with reference to charge parameter and selects automatically, and charge parameter is dynamically controlled and revised according to running situation.Automatically differentiating concrete parameter is provided with as follows:
Storage battery need not cause brownout (being lower than voltage U 1) for a long time, will at first get into " preliminary filling " stage, according to little electric current constant current charge;
Battery tension is higher than voltage U 2 and is lower than voltage U 3, gets into " filling soon " stage automatically, carries out big electric current constant current pressure limiting charging according to 0.1C;
Battery tension is higher than voltage U 3, gets into " all filling " stage automatically, charges according to the constant voltage and current limiting mode;
In " all filling " stage, when charging current is lower than certain little current ration, get into " floating charge stage " automatically, carry out constant current pressure limiting charging according to little electric current.
When the floating charge process reached setting-up time, battery was full of, and changed holding state automatically over to.
The charging Control Parameter dynamically arranges according to system operation situation, realizes the conversion of charge mode automatically, and control energy storage inverter is realized the optimal control that discharges and recharges of energy storage device.
The discharge of being incorporated into the power networks is controlled: being incorporated into the power networks discharge control is according to the electrical network needs, and dynamically the power and the power factor optimization aim of control are sent to external ac bus with the storage battery energy inversion.
The energy-storage system islet operation discharges and recharges control algolithm
Microgrid system and electrical network break off, and are that load provides electric energy by energy-storage system.The normal mode of operation of islet operation pattern is independent inverter mode; It is meant that ac bus and electrical network that two-way inverter is external break off; Its AC power as constant voltage/constant frequency inserts ac bus outward; According to the state-of-charge of need of load and storage battery, independently be the state of the electric that inserts on the ac bus according to the instruction of master control.
The control of energy-storage system optimized dispatching
(1) stabilizes power fluctuation
At first according to the generating prediction data, calculate the power curve of output, the day of formulating energy-storage system on this basis discharges and recharges strategy.The microgrid system follows following principle and reaches and stabilize the power fluctuation purpose:
When the output of wind generator system and photovoltaic generating system generating generating gross power is big, energy-storage battery is charged; In the output of wind generator system and photovoltaic generating system generating gross power hour, energy-storage battery is to system discharge.
Power curve choose reasonable according to energy-storage battery capacity and prediction wind generator system and photovoltaic generating system generating discharges and recharges the interval, and it is stable to keep gross output as far as possible for a long time, reduces the frequency that discharges and recharges of energy-storage battery as far as possible.Be that discharging and recharging of energy-storage battery adjust frequency can not be too big, otherwise can influence the useful life of battery.
Gross power output pulsation in wind generator system and photovoltaic generating system generating is not very big, and the energy-storage battery capacity has under the situation of certain surplus, can be with part capacity participation system load peak load shifting.
The microgrid system can be according to microgrid energy-storage system optimization control scheme; Minimizing is to the impact of external electrical network; Guarantee whole electric power netting safe running; Satisfy the microgrid system and stabilize the requirement of grid power fluctuation, Demand Side Response, improved its stability, compatibility and economy, the promotion and application in microgrid have practical significance preferably to energy-storage system.
The method and system that are used for the microgrid energy-storage system is optimized control that the embodiment of the invention provides; On the basis that takes into full account distributed power source and the characteristics of energy-storage system own, through to the monitoring of the real time data of photovoltaic generating system, wind generator system active power of output and accumulator voltage, energy-storage system active power, in conjunction with the user side demand response, stabilize the requirement of grid power and the prediction data of power load; Energy-storage system is optimized control; Satisfied the requirement of microgrid system power balance, reduced of the impact of microgrid system, guaranteed whole electric power netting safe running external electrical network; Satisfy the microgrid system and stabilize the requirement of grid power fluctuation, Demand Side Response; Greatly prolong simultaneously the time of piconet island operation, in the useful life of having improved batteries, reduced the maintenance investment of microgrid system; Improved its stability, compatibility and economy, the promotion and application in microgrid have practical significance preferably to energy-storage system.
More than be merely preferred embodiment of the present invention,, all any modifications of within spirit of the present invention and principle, being done, be equal to and replace and improvement etc., all should be included within protection scope of the present invention not in order to restriction the present invention.
Claims (10)
1. a method that is used for the microgrid energy-storage system is optimized control is characterized in that, this method may further comprise the steps:
Operational mode to microgrid system and external electrical network is judged;
When microgrid system and external electrical network when being incorporated into the power networks pattern, control mode is controlled energy-storage system according to being incorporated into the power networks;
When microgrid system and external electrical network are the islet operation pattern, energy-storage system is controlled according to the islet operation control mode.
2. the method for claim 1 is characterized in that, the control mode that is incorporated into the power networks in the said method may further comprise the steps:
Set exchange power lower limit M1 and exchange power upper limit M2 that microgrid system and external electrical network allow;
The exchange power M3 of monitoring in real time and acquisition microgrid system and external electrical network and external electrical network are to the transmitted power M4 of microgrid system;
When exchange power M3 is between exchange power lower limit M1 and exchange power upper limit M2, energy-storage system is not carried out any adjusting;
When exchange power M3 not between between exchange power lower limit M1 and the exchange power upper limit M2 and external electrical network during to the transmitted power M4 of microgrid system≤0, judge whether storage battery is full of;
When storage battery is full of electricity, be that target is charged then according to load and generating predicted power excision photovoltaic generating system and wind generator system, and with the zero energy;
When storage battery underfill electricity, then be that target is charged with the zero energy;
When exchange power M3 not between between exchange power lower limit M1 and the exchange power upper limit M2 and external electrical network during to the transmitted power M4 of microgrid system＞0, judge whether storage battery has reached the discharge limit;
Prescribe a time limit when storage battery has reached discharge electrode, then storage battery gets into holding state, and allows photovoltaic generating system and wind generator system generating according to intensity of illumination and wind speed;
When storage battery does not reach discharge electrode in limited time, then be that target is discharged with the zero energy.
3. the method for claim 1 is characterized in that, the islet operation control mode in the said method may further comprise the steps:
When the frequency that monitors the microgrid system is lower than 49.9HZ, photovoltaic generating system, wind generator system, storage battery and load operation situation are coordinated accordingly, controlled;
When the frequency that monitors the microgrid system is higher than 50.1HZ, the working condition of photovoltaic generating system, wind generator system, storage battery and load is coordinated accordingly, controlled.
4. like claim 1 or 3 described methods, it is characterized in that, in the said method, when the frequency that monitors the microgrid system is lower than 49.9HZ, the coordination of storage battery, control may further comprise the steps:
According to real-time Monitoring Data, obtain the power sagging curve of storage battery to storage battery;
Set the voltage atdischarge end and the maximum discharge current of storage battery, monitor the actual terminal voltage of storage battery in real time;
When the actual terminal voltage that monitors storage battery during, then the power output of wind generator system and photovoltaic generating system is monitored, controlled less than the voltage atdischarge end set;
When the actual terminal voltage that monitors storage battery during, according to the actual discharge electric current of the power sagging curve calculating accumulator of storage battery greater than the voltage atdischarge end set;
When the actual discharge electric current of storage battery during, then continue the frequency of microgrid system is monitored less than maximum discharge current;
When actual discharge electric current during greater than maximum discharge current, then control storage battery and discharge with maximum discharge current, simultaneously the power output of wind generator system and photovoltaic generating system is monitored, controlled.
5. like claim 1 or 3 described methods, it is characterized in that, in the said method, when the frequency that monitors the microgrid system is lower than 49.9HZ, the coordination of wind generator system, control may further comprise the steps:
Set the peak power output of wind generator system, monitor the real output of wind generator system in real time;
When the real output of wind generator system equals peak power output, then the power output of photovoltaic generating system is monitored, controlled;
When the real output of wind generator system during, then increase the real output of wind generator system less than peak power output;
When the power output of storage battery and wind generator system satisfies requiring of total load, then continue the frequency of microgrid system is monitored;
When the power output of storage battery and wind generator system can not satisfy requiring of total load, then the power output of photovoltaic generating system is monitored, controlled.
6. like claim 1 or 3 described methods, it is characterized in that, in the said method, when the frequency that monitors the microgrid system is lower than 49.9HZ, the coordination of photovoltaic generating system, control may further comprise the steps:
Set the peak power output of photovoltaic generating system, monitor the real output of photovoltaic generating system in real time;
When the real output of photovoltaic generating system equaled peak power output, then excision is corresponding loaded;
When the real output of photovoltaic generating system during, then increase the real output of photovoltaic generating system less than peak power output;
When the power output of storage battery, wind generator system and photovoltaic generating system satisfies requiring of total load, then continue the frequency of microgrid system is monitored;
When the power output of storage battery, wind generator system and photovoltaic generating system can not satisfy requiring of total load, then excision is corresponding loaded.
7. like claim 1 or 3 described methods, it is characterized in that in the said method, the implementation method that energy-storage battery is charged is:
Charge parameter voltage U 1, voltage U 2, voltage U 3, electric current I, time T are set, and voltage U 1＜voltage U 2＜voltage U 3;
According to running situation to charge parameter voltage U 1, voltage U 2, voltage U 3, electric current I, time T is dynamically controlled and revise, two-way inverter is selected with reference to the charge parameter that is provided with and according to the current state-of-charge of storage battery automatically;
When storage battery need not cause voltage to be lower than voltage U 1 for a long time, get into the preliminary filling stage, according to little electric current constant current charge;
When battery tension is higher than voltage U 2 and is lower than voltage U 3, get into and fill the stage soon, carry out big electric current constant current pressure limiting charging according to 0.1C;
When battery tension is higher than voltage U 3, gets into and all fill the stage, charge according to the constant voltage and current limiting mode;
All filling the stage, when charging current is lower than electric current I, getting into the floating charge stage, carrying out constant current pressure limiting charging according to little electric current;
When the floating charge process reached setting-up time T, storage battery was full of, and changed holding state over to.
8. a system that is used for the microgrid energy-storage system is optimized control is characterized in that, this system comprises:
The operational mode judge module is used for the operational mode of microgrid system and external electrical network is judged;
The control module that is incorporated into the power networks, be used for when microgrid system and external electrical network when being incorporated into the power networks pattern, control mode is controlled energy-storage system according to being incorporated into the power networks;
The islet operation control module is used for when microgrid system and external electrical network are the islet operation pattern, according to the islet operation control mode energy-storage system being controlled.
9. system as claimed in claim 8 is characterized in that, the said control module that is incorporated into the power networks further comprises:
The photovoltaic generating system regulation and control unit that is incorporated into the power networks is used for when microgrid system and external electrical network are incorporated into the power networks, the working condition of photovoltaic generating system being coordinated accordingly, being controlled;
The wind generator system regulation and control unit that is incorporated into the power networks is used for when microgrid system and external electrical network are incorporated into the power networks, the working condition of wind generator system being coordinated accordingly, being controlled;
Storage battery grid-connected regulation and control unit is used for when microgrid system and external electrical network are incorporated into the power networks, the working condition of storage battery being coordinated accordingly, being controlled;
The load regulation and control unit that is incorporated into the power networks is used for when microgrid system and external electrical network are incorporated into the power networks, load being coordinated accordingly, being controlled;
Said islet operation control module further comprises:
The first islet operation control module is used for when the frequency that monitors the microgrid system is lower than 49.9HZ, and photovoltaic generating system, wind generator system, storage battery and load operation situation are coordinated accordingly, controlled;
The second islet operation control module is used for when the frequency that monitors the microgrid system is higher than 50.1HZ, the working condition of photovoltaic generating system, wind generator system, storage battery and load being coordinated accordingly, being controlled.
10. like claim 8 or 9 described systems, it is characterized in that the said first islet operation control module further comprises:
First photovoltaic generating system isolated island regulation and control unit is used for when the frequency that monitors the microgrid system is lower than 49.9HZ, the working condition of photovoltaic generating system being coordinated accordingly, being controlled;
First wind generator system isolated island regulation and control unit is used for when the frequency that monitors the microgrid system is lower than 49.9HZ, the working condition of wind generator system being coordinated accordingly, being controlled;
First storage battery isolated island regulation and control unit is used for when the frequency that monitors the microgrid system is lower than 49.9HZ, the working condition of storage battery being coordinated accordingly, being controlled;
The first load isolated island regulation and control unit is used for when the frequency that monitors the microgrid system is lower than 49.9HZ, load being coordinated accordingly, being controlled;
The said second islet operation control module further comprises:
Second photovoltaic generating system isolated island regulation and control unit is used for when the frequency that monitors the microgrid system is higher than 50.1HZ, the working condition of photovoltaic generating system being coordinated accordingly, being controlled;
Second wind generator system isolated island regulation and control unit is used for when the frequency that monitors the microgrid system is higher than 50.1HZ, the working condition of wind generator system being coordinated accordingly, being controlled;
Second storage battery isolated island regulation and control unit is used for when the frequency that monitors the microgrid system is higher than 50.1HZ, the working condition of storage battery being coordinated accordingly, being controlled;
The second load isolated island regulation and control unit is used for when the frequency that monitors the microgrid system is higher than 50.1HZ, load being coordinated accordingly, being controlled.
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