CN202663127U - Micro-grid battery energy storage system frequency modulation control device based on fuzzy controller - Google Patents
Micro-grid battery energy storage system frequency modulation control device based on fuzzy controller Download PDFInfo
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- CN202663127U CN202663127U CN2012203653627U CN201220365362U CN202663127U CN 202663127 U CN202663127 U CN 202663127U CN 2012203653627 U CN2012203653627 U CN 2012203653627U CN 201220365362 U CN201220365362 U CN 201220365362U CN 202663127 U CN202663127 U CN 202663127U
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- 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
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
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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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- 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
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Abstract
The utility model discloses a microgrid battery energy storage system frequency modulation controlling means based on fuzzy controller, including photovoltaic power generation device, wind power generation set, fuzzy controller, battery energy storage system, main generator and load: the output ends of the photovoltaic power generation device, the wind power generation device, the battery energy storage system and the main generator are connected with a load, the frequency signal output ends of the main generator and the load are respectively connected with the signal input end of the fuzzy controller, and the signal output end of the fuzzy controller is connected with the signal input end of the battery energy storage system. Compared with the traditional PID controller, the device has strong adaptability to microgrid grid-connected/isolated network operation mode switching and nonlinearity and time-varying property of power grid operation parameters, has good dynamic response characteristic, and effectively improves the active power control precision of the battery energy storage system and the frequency stability of the microgrid.
Description
Technical field
The utility model belongs to electric power system microgrid field, particularly a kind of microgrid battery energy storage system frequency modulation control device based on fuzzy controller.
Background technology
Microgrid is important one of form that is incorporated into the power networks of distributed energy generating, and it refers to the small power generation unit (distributed power source) that disperses in the certain area is organized the mininet of formation, is an autonomous system that can realize oneself's control, protection and management.The pattern of being incorporated into the power networks of micro-grid system is divided into two kinds of networking pattern and island modes.Under the networking pattern, microgrid forms the combined operation system of a large-scale power grid and small grids by power distribution network and the parallel running of large-scale power net.When electrical network breaks down or the quality of power supply of electrical network can not satisfy in the situation such as customer requirements, the microgrid operation disconnects electrical link with large electrical network and under island mode, the microgrid independent operating.Microgrid must satisfy self supply and demand energy balance under island mode.
In general, the forms of electricity generation such as wind energy, solar energy, small power station, cogeneration of heat and power, gas turbine, fuel cell all can obtain to use in microgrid, and regenerative resource is that the main power source of microgrid forms.Because intermittence and the fluctuation of regenerative resource, when microgrid operates under the pattern of being incorporated into the power networks, microgrid can by with the Power Exchange of large electrical network with the intermittence that remedies regenerative resource and the fluctuation of load.But when microgrid operates under the island mode, since microgrid inertia become very little or even noninertia, therefore except the homophony frequency powers such as diesel engine, gas turbine, need to be equipped with the intermittence of energy storage device balance regenerative resource and the fluctuation of load, to satisfy the system frequency requirement.Particularly micro-grid system operates under the island mode, because the governing speed of diesel engine, gas turbine is slow, energy storage device will become requisite selection in the microgrid.The frequency modulation control function that micro-grid system need to rely on energy storage device is to keep the frequency stabilization of system behind significant frequency/power fluctuation.
The frequency modulation control method of the microgrid battery energy storage system that has put into operation at present mainly contains following two kinds:
1. droop control frequency modulation method.Main droop control characteristic curve by simulation synchronous generator speed regulator is realized, is similar to the primary frequency modulation in the large electrical network, mainly controls take battery energy storage system active power of output and the linear principle of frequency as prerequisite.When being frequency decline, battery energy storage increases meritorious exerting oneself; When frequency rose, battery energy storage reduced meritorious exerting oneself.The equation of droop control is: P=P
Ref+ K* △ f, △ f are the microgrid frequency departure, △ f=f
Ref-f.
2. urgent frequency modulation control method.The urgent frequency modulation method of microgrid energy-storage system mainly contains two classes: (a) frequency out-of-limit power is completely sent out method, namely when the microgrid frequency exceed the frequency modulation operating dead zone or out-of-limit after, after certain time-delay, energy-storage system completely sent out meritorious or full inhale meritorious.(b) secured adjusted amount method, namely when the microgrid frequency exceed the frequency modulation operating dead zone or out-of-limit after, energy-storage system at first sends/absorbs the meritorious amount of secured adjusted P
Regulate, then change with frequency departure.The equation of its FREQUENCY CONTROL is: P=P
Ref+ K* △ f+P
Regulate
The droop control frequency modulation method has advantages of not to be needed to communicate to contact with other power supply of micro-grid system just can implement to control, but this control method can cause energy storage to discharge and recharge frequently, affects battery and operational efficiency.Work as simultaneously microgrid and face in the situation of high-power disturbance, the method can't effectively be utilized the fireballing characteristics of battery energy storage system power adjustments, can not support for micro-grid system in emergency circumstances provide power/frequency.And the major defect of urgent frequency modulation control method is, in case it is improper that the parameters such as proportionality coefficient or secured adjusted amount arrange, can cause the vibration that battery energy storage output is meritorious and then cause the system frequency vibration, particularly operate in islet operation pattern and battery energy storage accounting when higher when microgrid, might cause large system disturbance, and then cause system crash.In addition, all there is following shortcoming in two kinds of control methods:
1. parameter tuning is difficult.Operation of power networks nonlinearity in parameters and time variation are strong, and the control parameter arranges rule and calculation complex.
2. bad adaptability.Microgrid be incorporated into the power networks and lonely network operation pattern under system performance change huge, fixedly the setting of frequency modulation control parameter can't adapt to that microgrid is incorporated into the power networks and lonely network operation pattern between switching;
3. the control transplantability is poor.Each system parameters needs again to adjust according to system scale.
Summary of the invention
The purpose of this utility model is for overcoming the deficiencies in the prior art and shortcoming, proposing a kind of microgrid battery energy storage system frequency modulation control device based on fuzzy controller.The utility model device can effectively adapt to microgrid and be incorporated into the power networks/lonely network operation pattern switching and operation of power networks nonlinearity in parameters and time variation, has preferably dynamic response characteristic, improves the frequency stability of battery energy storage system active power control precision and microgrid.
To achieve these goals, the technical solution of the utility model is as follows:
A kind of microgrid battery energy storage system frequency modulation control device based on fuzzy controller comprises photovoltaic power generation apparatus, wind power generation plant, fuzzy controller, battery energy storage system, main generator and load:
The output of described photovoltaic power generation apparatus, wind power generation plant, battery energy storage system and main generator is connected with load, main generator is connected the frequency signal output and is connected with the signal input part of fuzzy controller respectively with load, the fuzzy controller signal output part is connected with the signal input part of battery energy storage system.
Described fuzzy controller is the PID fuzzy controller.
Described main generator is diesel engine generator.
The beneficial effects of the utility model are, can effectively adapt to micro-grid system to be incorporated into the power networks/lonely network operation pattern switches and the uncertainty of operation of power networks parameter, non-linear and time variation, makes it satisfy the dynamic characteristics and static characteristics of system under the different microgrid operational modes.The power of energy-storage system is frequently regulated during the frequency fluctuation within a narrow range avoiding being incorporated into the power networks at microgrid, is that frequency fluctuates widely and realizes the urgent frequency modulation of energy storage in the situation at the lonely network operation of microgrid simultaneously.This device can Effective Raise the frequency stability of energy-storage system active power control precision and microgrid.
Description of drawings
Fig. 1 is the microgrid main wiring diagram;
Fig. 2 is structured flowchart of the present utility model;
Fig. 3 is the design sketch that does not adopt the energy storage frequency modulation control;
Fig. 4 is the design sketch that adopts the urgent frequency modulation of secured adjusted amount method;
Fig. 5 adopts design sketch of the present utility model.
Embodiment
Below in conjunction with accompanying drawing and Calculation Simulation example the utility model is described further.
Fig. 1 is the microgrid main wiring diagram, comprises conventional microgrid power supply among the figure: diesel engine generator, wind power generation, photovoltaic generation, battery energy storage and power load.Adopting diesel engine generator in the Calculation Simulation of the present embodiment is main power source, and battery energy storage system plays the auxiliary adjustment effect.When wind-powered electricity generation and photovoltaic are exerted oneself and loaded when changing by a small margin, the microgrid frequency is with corresponding to some extent fluctuation, this moment is main by large electrical network or the main power source adjustment frequency modulation of exerting oneself, battery energy storage system should be regulated not even action by a small margin, thereby avoids meritorious the exerting oneself of frequent adjusting that battery life and operational efficiency are had a negative impact.When wind-powered electricity generation with photovoltaic is exerted oneself and when sudden load increase or anticlimax, the microgrid frequency will significantly change, and the action of battery energy storage system frequency modulation control is sent rapidly or absorbed active power and oppositely regulates, thereby so that the fast quick-recovery of frequency is normal, play the purpose that improves the stability of a system.
Fig. 2 is structured flowchart of the present utility model, and a kind of microgrid battery energy storage system frequency modulation control device based on fuzzy controller comprises photovoltaic power generation apparatus 1, wind power generation plant 2, fuzzy controller 3, battery energy storage system 4, main generator 5 and load:
The output of photovoltaic power generation apparatus 1, wind power generation plant 2, battery energy storage system 4 and main generator 5 is connected with load, main generator 5 is connected with the signal input part of fuzzy controller 3 respectively with the frequency signal output of being connected, and fuzzy controller 3 signal output parts are connected with the signal input part of battery energy storage system 4.。In the present embodiment, fuzzy controller 3 is the PID fuzzy controller.
The course of work of the present utility model is: when photovoltaic power generation apparatus 1, wind power generation plant 2 and sudden load increase or anticlimax, fuzzy controller 3 obtains the frequency signal of load and main generator 5, fuzzy controller 3 control battery energy storage systems 4, the action of battery energy storage system 4 frequency modulation control, send rapidly or absorb active power and oppositely regulate load, thereby so that the fast quick-recovery of frequency is normal, play the purpose that improves micro-grid system stability.
Fig. 3 is the design sketch that does not adopt energy storage frequency modulation control device; Fig. 4 is the design sketch that adopts the urgent frequency modulation of secured adjusted amount method; Fig. 5 is based on the design sketch of the microgrid battery energy storage system frequency modulation control device of fuzzy controller.Micro-grid system shown in Figure 1 is adopted in emulation, and this microgrid comprises battery energy storage, diesel engine generator, wind power generation plant, photovoltaic power generation apparatus, motor and load.Consider the diesel engine generator power P that overfills in this emulation
Bavin, the load 50%P that uprushes
Bavin, power shortage needs all to provide support by battery energy storage system.Can see from simulation result: Fig. 3 is not for taking the micro-grid system frequency simulation curve of frequency modulation control method, and battery energy storage system is not taked frequency modulation control, the system frequency unstability; Fig. 4 is the frequency simulation curve of taking the urgent frequency modulation control method of secured adjusted amount, and system can holding frequency stablize behind the power disturbance, and the most high/low frequency of micro-grid system is 53.0Hz/46.5Hz in the transient process; Fig. 5 is the frequency simulation curve of taking based on the microgrid battery energy storage frequency modulation control method of fuzzy control, and system can holding frequency stablize behind the power disturbance, and the most high/low frequency of micro-grid system is 50.8Hz/48.8Hz in the transient process.
Therefore, employing is based on the microgrid battery energy storage frequency modulation control device of fuzzy controller, can under fluctuating widely situation, the microgrid frequency realize the urgent frequency modulation control of energy storage, compare with urgent frequency modulation control method with the droop control frequency modulation control of conventional batteries energy storage, has preferably dynamic response characteristic, have stronger anti-disturbance ability, show stronger robustness, can Effective Raise the frequency stability of microgrid.
Claims (3)
1. microgrid battery energy storage system frequency modulation control device based on fuzzy controller is characterized in that comprising photovoltaic power generation apparatus (1), wind power generation plant (2), fuzzy controller (3), battery energy storage system (4), main generator (5) and load:
The output of described photovoltaic power generation apparatus (1), wind power generation plant (2), battery energy storage system (4) and main generator (5) is connected with load, main generator (5) is connected with the signal input part of fuzzy controller (3) respectively with the frequency signal output of being connected, and fuzzy controller (3) signal output part is connected with the signal input part of battery energy storage system (4).
2. described microgrid battery energy storage system frequency modulation control device based on fuzzy controller according to claim 1 is characterized in that described fuzzy controller (3) is the PID fuzzy controller.
3. described microgrid battery energy storage system frequency modulation control device based on fuzzy controller according to claim 1 is characterized in that described main generator (5) is diesel engine generator.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166250A (en) * | 2013-01-31 | 2013-06-19 | 东南大学 | An energy intelligent management device for a multi-energy power supply system |
| CN103414186A (en) * | 2013-08-09 | 2013-11-27 | 江苏海德森能源有限公司 | Distributed-type frequency modulation method based on inverters in off-network mode of micro-grid |
| CN104298108A (en) * | 2014-09-11 | 2015-01-21 | 国家电网公司 | Control method for improving primary frequency modulation performance based on fuzzy control rule |
| CN105656081A (en) * | 2016-03-03 | 2016-06-08 | 北京清能世福科技有限公司 | Large-capacity new energy power generation system |
| CN108599192A (en) * | 2018-03-30 | 2018-09-28 | 中国电力科学研究院有限公司 | A kind of out-of-limit fast control method of power and system of isolated island current conversion station connected with passive power grid |
-
2012
- 2012-07-26 CN CN2012203653627U patent/CN202663127U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166250A (en) * | 2013-01-31 | 2013-06-19 | 东南大学 | An energy intelligent management device for a multi-energy power supply system |
| CN103414186A (en) * | 2013-08-09 | 2013-11-27 | 江苏海德森能源有限公司 | Distributed-type frequency modulation method based on inverters in off-network mode of micro-grid |
| CN103414186B (en) * | 2013-08-09 | 2016-06-15 | 江苏海德森能源有限公司 | Based on the distributed-type frequency modulation of inverter under microgrid off-network pattern |
| CN104298108A (en) * | 2014-09-11 | 2015-01-21 | 国家电网公司 | Control method for improving primary frequency modulation performance based on fuzzy control rule |
| CN105656081A (en) * | 2016-03-03 | 2016-06-08 | 北京清能世福科技有限公司 | Large-capacity new energy power generation system |
| CN108599192A (en) * | 2018-03-30 | 2018-09-28 | 中国电力科学研究院有限公司 | A kind of out-of-limit fast control method of power and system of isolated island current conversion station connected with passive power grid |
| CN108599192B (en) * | 2018-03-30 | 2020-09-25 | 中国电力科学研究院有限公司 | A method and system for fast power over-limit control for islanded converter station connected to passive grid |
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