CN102427230A - Wind-light storage combined dispatching method and system used for distributed microgrid island operation - Google Patents
Wind-light storage combined dispatching method and system used for distributed microgrid island operation Download PDFInfo
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- CN102427230A CN102427230A CN2011104263074A CN201110426307A CN102427230A CN 102427230 A CN102427230 A CN 102427230A CN 2011104263074 A CN2011104263074 A CN 2011104263074A CN 201110426307 A CN201110426307 A CN 201110426307A CN 102427230 A CN102427230 A CN 102427230A
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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
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Abstract
The invention belongs to the field of distribution network dispatching and managing, which provides a wind-light storage combined dispatching method and system used for distributed microgrid island operation. According to collected real-time data as well as photovoltaics and fan power generation and power load prediction data obtained by calculation, the total output power of photovoltaics and fan and a load and energy storage inverter system are coordinated and controlled to satisfy the requirement of system power balancing; the energy storage and the load of the photovoltaics, a fan and a storage cell are considered in a coordinating mode; a control signal is emitted to cause each inverter to output active power required by a microgrid system to achieve the optimal energy use ratio; therefore, the microgrid system can integrate the power generation and power consumption situations between three systems of a fan system, a photovoltaic system and an energy storage system and load so as to coordinate each subsystem to effectively operate; when an external grid is detected to restore to be normal, the microgrid system is switched to a grid-connected operation mode according to a grid-connected and island mode switching control strategy, and the economy and the stability of the microgrid system in the island mode can be improved.
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 distributed piconet island operation scene storage combined dispatching.
Background technology
By the microgrid system that photovoltaic generating system, wind generator system, batteries to store energy and load are formed, the generated output of photovoltaic generating system and wind generator system receives the influence of weather very big, can cause the power supply of microgrid system and the imbalance of power load.Be under the islet operation pattern at microgrid, the voltage reference source when the batteries to store energy system is operation, control microgrid frequency and voltage keep constant; If generated output is greater than load power; Can cause batteries to store energy system inverse probability, influence the stable operation of microgrid system, if generated output is too less than load power; Can cause the batteries discharging current to be far longer than optimum discharging current; Thereby greatly shortened the time of piconet island operation, and the useful life that can reduce batteries, the maintenance investment of system increased.
The control device of existing microgrid system under the islet operation pattern is simple relatively, has only considered the active power balance of microgrid, does not further investigate microgrid system optimization control and economic dispatch, under the islet operation pattern, is difficult to satisfy the needs of microgrid operation.
Summary of the invention
The invention provides a kind of method and system that are used for distributed piconet island operation scene storage combined dispatching; It is simple relatively to be intended to solve the control device of existing microgrid system under the islet operation pattern; Only considered the active power balance of microgrid; Do not further investigate microgrid system optimization control and economic dispatch, under the islet operation pattern, be difficult to satisfy the needs of microgrid operation, the bigger problem of maintenance investment of system.
The object of the present invention is to provide a kind of method that is used for distributed piconet island operation scene storage combined dispatching, this method may further comprise the steps:
Image data information calculates generating of photovoltaic generating system and wind generator system and power load prediction data in real time;
Coordinate, control the operation of photovoltaic generating system, wind generator system, energy storage inversion system and load.
Another object of the present invention is to provide a kind of system that is used for distributed piconet island operation scene storage combined dispatching, said system comprises:
The working method setting module is used for the working method of photovoltaic generating system, wind generator system is set at permanent power;
The frequency monitoring module is used to monitor the frequency of microgrid system;
The power regulation module is used for the frequency according to the microgrid system that monitors, the operation conditions of control photovoltaic generating system, wind generator system, energy storage inversion system and load.
The method and system that are used for distributed piconet island operation scene storage combined dispatching provided by the invention; According to the various real time datas that collect; And according to the photovoltaic generating system that calculates and wind generator system generating and power load prediction data; To coordinating to control to satisfy the requirement of system power balance between the output gross power of photovoltaic generating system and wind generator system and load, the energy storage inversion system; Coordinate to consider photovoltaic generating system, wind generator system, batteries to store energy and load; Send control signal and make the output of each inverter satisfy the required active power of microgrid system, reach best energy utilization rate and economy, make the microgrid system comprehensively wind generator system, photovoltaic generating system and energy storage three big systems and load between generating and electricity consumption situation; Coordinating each subsystem effectively moves; Under the piconet island operational mode, keep constant with the energy storage inversion system as frequency and the voltage that main power source supports microgrid, after detecting external electrical network recovery normally; Microgrid system basis is incorporated into the power networks and isolated island mode switch control strategy switches to the pattern of being incorporated into the power networks, and has improved economy and the stability of microgrid system under the isolated island pattern.
Description of drawings
Fig. 1 is that the distributed piconet island operation scene that is used for that the embodiment of the invention provides stores up the realization flow figure of the method for combined dispatching;
Fig. 2 is the flow chart of implementation method of the operation of the coordination that provides of the embodiment of the invention, control photovoltaic generating system, wind generator system, energy storage inversion system and load;
Fig. 3 is the frequency of the microgrid system that monitors of basis that the embodiment of the invention provides, the flow chart of the implementation method of the operation conditions of control photovoltaic generating system, wind generator system, energy storage inversion system and load;
The distributed piconet island operation scene that is used for that Fig. 4 shows the embodiment of the invention to be provided stores up the structured flowchart of the system of combined dispatching.
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.
The distributed piconet island operation scene that is used for that Fig. 1 shows the embodiment of the invention to be provided stores up the realization flow of the method for combined dispatching.
This method may further comprise the steps:
In step S101, image data information calculates generating of photovoltaic generating system and wind generator system and power load prediction data in real time;
In step S102, coordinate, control the operation of photovoltaic generating system, wind generator system, energy storage inversion system and load.
As shown in Figure 2, the implementation method of in embodiments of the present invention, coordinating, control the operation of photovoltaic generating system, wind generator system, energy storage inversion system and load is:
In step S201, the working method of photovoltaic generating system, wind generator system is set at permanent power;
In step S202, the frequency f of monitoring microgrid system;
In step S203, according to the frequency f of the microgrid system that monitors, the operation conditions of control photovoltaic generating system, wind generator system, energy storage inversion system and load.
As shown in Figure 3, in embodiments of the present invention, according to the frequency f of the microgrid system that monitors, the implementation method of the operation conditions of control photovoltaic generating system, wind generator system, energy storage inversion system and load is:
When the frequency f 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 f 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 f when monitoring the microgrid system that this method provides 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 f 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 f when monitoring the microgrid system that this method provides is lower than 49.9HZ, the coordination of wind generator system, control may further comprise the steps:
Set the peak power output W1 of wind generator system, monitor the real output W2 of wind generator system in real time;
When the real output W2 of wind generator system equals peak power output W1, then the power output of photovoltaic generating system is monitored, controlled;
As the real output W2 of wind generator system during, then increase the real output W2 of wind generator system less than peak power output W1;
When the power output of storage battery and wind generator system satisfies requiring of total load, then continue the frequency f 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 f when monitoring the microgrid system that this method provides is lower than 49.9HZ, the coordination of photovoltaic generating system, control may further comprise the steps:
Set the peak power output W3 of photovoltaic generating system, monitor the real output W4 of photovoltaic generating system in real time;
When the real output W4 of photovoltaic generating system equaled peak power output W3, then excision is corresponding loaded;
As the real output W4 of photovoltaic generating system during, then increase the real output W4 of photovoltaic generating system less than peak power output W3;
When the power output of storage battery, wind generator system and photovoltaic generating system satisfies requiring of total load, then continue the frequency f 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.
In embodiments of the present invention, when the frequency f when monitoring the microgrid system that this method provides is higher than 50.1HZ, the working condition of photovoltaic generating system, wind generator system, storage battery and load is coordinated accordingly, is controlled and may further comprise the steps:
When overload is excised, then recover the load of corresponding power, and continue the frequency f of microgrid system is monitored;
When not excising overload, then, reduce the power output of wind generator system and photovoltaic generating system simultaneously to for the storage battery that is full of electricity charges.
The distributed piconet island that is used for that Fig. 4 shows the embodiment of the invention to be provided moves the structure that scene stores up the system of combined dispatching.For the ease of explanation, only show the part relevant with the present invention.
This system comprises:
Working method setting module 41 is used for the working method of photovoltaic generating system, wind generator system is set at permanent power;
In embodiments of the present invention, power regulation module 43 further comprises:
The first power regulation module 431 is used for when the frequency f 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 power regulation module 432 is used for when the frequency f 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 power regulation module 431 further comprises:
First photovoltaic generating system regulation and control unit 4311 is used for when the frequency f 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 regulation and control unit 4312 is used for when the frequency f 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 regulation and control unit 4313 is used for when the frequency f that monitors the microgrid system is lower than 49.9HZ, the working condition of storage battery being coordinated accordingly, being controlled;
The first load control unit 4314 is used for when the frequency f that monitors the microgrid system is lower than 49.9HZ, load being coordinated accordingly, being controlled;
In embodiments of the present invention, the second power regulation module 432 further comprises:
Second photovoltaic generating system regulation and control unit 4321 is used for when the frequency f 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 regulation and control unit 4322 is used for when the frequency f 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 regulation and control unit 4323 is used for when the frequency f that monitors the microgrid system is higher than 50.1HZ, the working condition of storage battery being coordinated accordingly, being controlled;
The second load control unit 4324 is used for when the frequency f 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 distributed piconet island operation scene storage combined dispatching that the embodiment of the invention provides; According to the various real time datas that collect; And according to generating of the photovoltaic generating system that calculates and wind generator system and power load prediction data, to coordinating to control to satisfy the requirement of system power balance between the output gross power of photovoltaic generating system and wind generator system and load, the energy storage inversion system.
As shown in Figure 3, consider the characteristic of distributed power source, control the flexible control that realizes microgrid through many agencies, on the basis of unified control microgrid distributed power source, energy storage and load, guarantee reliably power supply under the islet operation pattern; Guarantee the quality of power supply simultaneously, realize optimized operation, reach energy conservation and environment protection.
1, distribution power is independently controlled
(1) the independent control of photovoltaic generating system generating
Photovoltaic generating system battery output VA characteristic curve is a nonlinear characteristic, and its output power curve also is non-linear.Working point when wherein electric current and voltage product are for maximum is a maximum power point.Load characteristic generally also is non-linear, and load should let load operation point and array maximum power working point be close when using as far as possible, and the photovoltaic generating system array is with Maximum Power Output like this.Photovoltaic generating system battery maximum power working point is departed from load or converter working point will reduce photovoltaic generating system battery delivery efficiency, waste cell panel capacity.
Photovoltaic generating system generates electricity under the autonomous independent control mode, and maximal power tracing control is adopted in the output of photovoltaic generating system inverter usually, the adjusting that input or the excision through control photovoltaic generating system inverter realizes the photovoltaic generating system generating.
(2) the independent control of wind generator system generating
Under a certain wind speed, the output mechanical power of wind energy conversion system changes with the difference of rotating speed, and the rotating speed an of the best is wherein arranged, under this rotating speed, and wind energy conversion system output maximum machine power, it and respective relationships are best tip speed ratio relations; Under different wind; All there is the rotating speed an of the best to make wind energy conversion system output maximum machine power; These maximum power points are coupled together to obtain a maximum output mechanical power curve; Be the best power load line, be in any point on this curve, its rotating speed and respective relationships are best tip speed ratio relation.Therefore control wind energy conversion system rotating speed just can be realized maximum power control to the optimum speed variation under different wind speed.
2, islet operation discharges and recharges control algolithm
Microgrid system and electrical network break off, and are that load provides electric energy by the energy storage inversion 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.
3, be incorporated into the power networks and islet operation mode switch control
Under the piconet island operational mode, keep constant with the energy storage inversion system as frequency and the voltage that main power source supports microgrid, after detecting external electrical network recovery normally, microgrid system basis is incorporated into the power networks and isolated island mode switch control strategy switches to the pattern of being incorporated into the power networks.
The method and system that are used for distributed piconet island operation scene storage combined dispatching that the embodiment of the invention provides; According to the various real time datas that collect; And according to the photovoltaic generating system that calculates and wind generator system generating and power load prediction data; To coordinating to control to satisfy the requirement of system power balance between the output gross power of photovoltaic generating system and wind generator system and load, the energy storage inversion system; Coordinate to consider photovoltaic generating system, wind generator system, batteries to store energy and load; Send control signal and make the output of each inverter satisfy the required active power of microgrid system, reach best energy utilization rate and economy, make the microgrid system comprehensively wind generator system, photovoltaic generating system and energy storage three big systems and load between generating and electricity consumption situation; Coordinating each subsystem effectively moves; Under the piconet island operational mode, keep constant with the energy storage inversion system as frequency and the voltage that main power source supports microgrid, after detecting external electrical network recovery normally; Microgrid system basis is incorporated into the power networks and isolated island mode switch control strategy switches to the pattern of being incorporated into the power networks, and has improved economy and the stability of microgrid system under the isolated island pattern.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. one kind is used for the method that distributed piconet island operation scene stores up combined dispatching, it is characterized in that this method may further comprise the steps:
Image data information calculates generating of photovoltaic generating system and wind generator system and power load prediction data in real time;
Coordinate, control the operation of photovoltaic generating system, wind generator system, energy-storage system and load.
2. the method for claim 1 is characterized in that, the implementation method of the operation of said coordination, control photovoltaic generating system, wind generator system, energy-storage system and load is:
The working method of photovoltaic generating system, wind generator system is set at permanent power;
The frequency of monitoring microgrid system;
According to the frequency of the microgrid system that monitors, the operation conditions of control photovoltaic generating system, wind generator system, energy-storage system and load.
3. method as claimed in claim 2 is characterized in that, the frequency of the microgrid system that said basis monitors, and the implementation method of the operation conditions of control photovoltaic generating system, wind generator system, energy-storage system and load is:
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. the method for claim 1 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. the method for claim 1 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 W1 of wind generator system, monitor the real output W2 of wind generator system in real time;
When the real output W2 of wind generator system equals peak power output W1, then the power output of photovoltaic generating system is monitored, controlled;
As the real output W2 of wind generator system during, then increase the real output W2 of wind generator system less than peak power output W1;
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. the method for claim 1 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 W3 of photovoltaic generating system, monitor the real output W4 of photovoltaic generating system in real time;
When the real output W4 of photovoltaic generating system equaled peak power output W3, then excision is corresponding loaded;
As the real output W4 of photovoltaic generating system during, then increase the real output W4 of photovoltaic generating system less than peak power output W3;
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. the method for claim 1; It is characterized in that; In the said method, 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, is controlled and may further comprise the steps:
When overload is excised, then recover the load of corresponding power, and continue the frequency of microgrid system is monitored;
When not excising overload, then, reduce the power output of wind generator system and photovoltaic generating system simultaneously to for the storage battery that is full of electricity charges.
8. one kind is used for the system that distributed piconet island operation scene stores up combined dispatching, it is characterized in that said system comprises:
The working method setting module is used for the working method of photovoltaic generating system, wind generator system is set at permanent power;
The frequency monitoring module is used to monitor the frequency of microgrid system;
The power regulation module is used for the frequency according to the microgrid system that monitors, the operation conditions of control photovoltaic generating system, wind generator system, energy-storage system and load.
9. method as claimed in claim 8 is characterized in that, said power regulation module further comprises:
The first power regulation 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 power regulation 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 methods, it is characterized in that the said first power regulation module further comprises:
First photovoltaic generating system 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 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 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 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 power regulation module further comprises:
Second photovoltaic generating system 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 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 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 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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