CN104393607A - Power stabilizing method and device for micro-grid system grid-connected node - Google Patents
Power stabilizing method and device for micro-grid system grid-connected node Download PDFInfo
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- CN104393607A CN104393607A CN201410681068.0A CN201410681068A CN104393607A CN 104393607 A CN104393607 A CN 104393607A CN 201410681068 A CN201410681068 A CN 201410681068A CN 104393607 A CN104393607 A CN 104393607A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/14—District level solutions, i.e. local energy networks
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Abstract
The invention discloses a power stabilizing method for a micro-grid system grid-connected node, and relates to the technical field of power control of the micro-grid system grid-connected nodes. According to the method, a functional module framework is built, a computer system is controlled by a computer program command, and the computer program command is stored in a readable storage medium of a computer. The method mainly includes a low-frequency stabilizing step, a medium-frequency stabilizing step and a power adjusting step. Power fluctuation of the grid-connected node is stabilized through a PI adjuster by a low-frequency stabilizing algorithm to obtain low-frequency adjusting overall power Pd, and a peak load shaving function is achieved. In the medium-frequency stabilizing step, medium-frequency adjusting overall power Pz is obtained by an improved secondary frequency modulation algorithm, the frequency of executing the medium-frequency stabilizing step is higher than that of executing the low-frequency stabilizing step, and the power of each inverter is adjusted according to the Pd and the Pz in the power adjusting step, so that power fluctuation of the grid-connected node is stabilized.
Description
Technical field
The invention relates to the power control techniques field of the grid-connected node of micro-grid system, the power being specifically related to the grid-connected node of a kind of micro-grid system stabilizes method, the method is by setting up functional module construction, come by computer program instructions computer for controlling system, these computer program instructions store in a computer-readable storage medium.
Background technology
Micro-grid system (micro-grid); refer to collected by distributed power source, energy storage device, energy conversion device and related load be small-sizedly transported to electric system; be a kind of can teaching display stand control, the autonomous system of protect and manage; it both can be incorporated into the power networks with bulk power grid, also can isolated operation.Micro-grid system is the important component part of intelligent grid.
When micro-grid system and bulk power grid are incorporated into the power networks, micro-grid system is according to energy management algorithm, and timing ga(u)ge calculates schedule power P
0, schedule power P
0as the target power of the grid-connected node of this micro-grid system, micro-grid system is according to schedule power P
0control the power of the grid-connected node of micro-grid system, make it follow schedule power P
0.
In fact, may there is fluctuation in the power of the grid-connected node of micro-grid system, when the power fluctuation of grid-connected node is larger, electrical network can be caused to impact, thus reduce the quality of power supply.Therefore be necessary that carrying out power to the grid-connected node of micro-grid system stabilizes, to scheme the power fluctuation eliminating grid-connected node, improve the quality of power supply.Method is not stabilized for the system-level power of the power fluctuation of grid-connected node, only according to schedule power P in prior art
0can be accompanied with the effect that power is stabilized when controlling the power of grid-connected node of micro-grid system, but the main purpose of the control of this power to grid-connected node is the control of power, but not the stabilizing of power fluctuation, and frequency is low, and speed is slow.Therefore, the frequency that existing this power stabilizes method covering is few, and the effect that power is stabilized is poor.
For this reason, inventor is by introduction innovation Research Team of Guangdong Province programme support (Supported by Guangdong Innovative Research Team Program) (No.2011N015), stabilize the power of the grid-connected node of micro-grid system and study, intention works out the power that a kind of power stabilizes the grid-connected node of the good micro-grid system of effect and stabilizes method.
Summary of the invention
For the above-mentioned technical problem of prior art, the invention provides the power of the grid-connected node of a kind of micro-grid system to stabilize method, and it can stabilize the power fluctuation of the grid-connected node of micro-grid system under multi-frequency, and the effect that power is stabilized is better.
For achieving the above object, the invention provides following technical scheme.
The power of the grid-connected node of micro-grid system stabilizes method, it is characterized in that, comprising:
Low frequency stabilizes step: obtain the realtime power of described grid-connected node or the average power of nearest certain time, by itself and schedule power P
0make difference and obtain difference DELTA P, then this difference DELTA P is inputted pi regulator, the output of pi regulator regulates gross power P as low frequency
d, this low frequency is regulated gross power P
ddistribute to each inverter of described micro-grid system, i-th inverter distribution to low frequency regulating power be designated as P
di;
Intermediate frequency stabilizes step: obtain the average power in the realtime power of described grid-connected node or preset time period, and obtain the real-time frequency of described grid-connected node, by the average power in the realtime power of described grid-connected node or preset time period and schedule power P
0make difference and obtain difference DELTA P, by the real-time frequency of described grid-connected node and the given frequency f of described micro-grid system
0make difference and obtain difference DELTA f, make area control error ACE=Δ P+ β Δ f, wherein β is frequency bias coefficient, then area control error ACE is inputted pi regulator, and the output of pi regulator regulates gross power P as intermediate frequency
z, this intermediate frequency is regulated gross power P
zdistribute to the inverter that each of described micro-grid system has frequency modulation frequency modulation function, the inverter distribution without frequency modulation frequency modulation function of described micro-grid system to intermediate frequency regulating power be 0, i-th inverter distribution to intermediate frequency regulating power be designated as P
zi;
Perform frequency that intermediate frequency stabilizes step higher than the frequency performing low frequency and stabilize step, each low frequency that performs is stabilized after step or intermediate frequency stabilize step, just upgrades low frequency regulating power or the intermediate frequency regulating power of each inverter of described micro-grid system;
Power modulating step: the power regulating each inverter of described micro-grid system in real time, the regulating power of i-th inverter is P
di+ P
zi, follow schedule power P to make the power of described grid-connected node
0.
Wherein, also comprise:
High frequency stabilizes step: the realtime power obtaining described grid-connected node, then extracts high frequency power signals by high pass filter, according to this high frequency power signals and schedule power P
0control the power of energy storage device to described grid-connected node to compensate, follow schedule power P to make the power of described grid-connected node
0.
Wherein, described energy storage device is energy storage inverter, and it is connected with described grid-connected node.
Wherein, adopt DPC algorithm to control the power of described energy storage device to described grid-connected node to compensate.
The beneficial effect of the invention is: the power of the invention stabilizes method from system-level angle, the power fluctuation of the grid-connected node under multi-frequency is stabilized, also can according to the computing capability of controller, perform low frequency with suitable frequency and stabilize step and intermediate frequency stabilizes step, the effect that power is stabilized is controlled, perform low frequency to stabilize step and intermediate frequency to stabilize the frequency of step higher, the effect that power is stabilized is better.Therefore, the power of the invention stabilizes method can improve the stability of micro-grid system within the whole service cycle and reliability, prevents electrical network and impacts, improve the quality of power supply.
Embodiment
Below in conjunction with specific embodiment, the invention is elaborated.
First to be described, be provided with intelligent gateway circuit breaker in micro-grid system to gather the realtime power of the grid-connected node of micro-grid system.
The power of the grid-connected node of micro-grid system of the present embodiment is stabilized method and is mainly comprised three steps below:
Low frequency stabilizes step.During the new dispatch command that micro-grid system receives that bulk power system sends, the average power of the grid-connected node calculating this micro-grid system according to the data of described intelligent gateway circuit breaker collection before this in 5 minutes, then by the schedule power P in this average power and new dispatch command
0make difference and obtain difference DELTA P, this difference DELTA P, as the input of pi regulator, regulates gross power P via the output after pi regulator as low frequency
d, distribute low frequency with reference to the ruuning situation of each inverter in micro-grid system and regulate gross power P
d, i-th inverter distribution to low frequency regulating power be designated as P
di, the low frequency regulating power that all inverter distribution in micro-grid system arrive and be low frequency regulate gross power P
d.Low frequency is stabilized step and is just performed once when only bulk power grid sends new dispatch command, stabilizes, play the effect of peak load shifting to the low frequency power of the grid-connected node of micro-grid system.After each execution low frequency stabilizes step, just upgrade the low frequency regulating power of each inverter of described micro-grid system.
As another embodiment, also by the realtime power of the described grid-connected node of intelligent gateway circuit breaker sampling, then by this realtime power and current schedule power P
0make difference and obtain difference DELTA P, just the accuracy of difference DELTA P may slightly decline, but still can select as one, for selecting in some cases.
Intermediate frequency stabilizes step.The average power of described grid-connected node in preset time period is calculated according to the data that intelligent gateway circuit breaker gathers, this preset time period duration is set as 5 seconds, from this intermediate frequency stabilize step start to perform first 5 seconds only to stabilize when step starts to perform, by above-mentioned average power and current schedule power P to this intermediate frequency
0make difference and obtain difference DELTA P.In addition, the real-time frequency f that this intermediate frequency stabilizes described grid-connected node when step starts to perform also is obtained, by the given frequency f of this real-time frequency f and described micro-grid system
0make difference and obtain difference DELTA f.Make area control error ACE=Δ P+ β Δ f, wherein β is frequency bias coefficient, and area control error ACE regulates gross power P via the output after pi regulator as intermediate frequency
z, the ruuning situation with reference to micro-grid system Nei Getai with the inverter of frequency modulation frequency modulation function regulates gross power P to distribute intermediate frequency
z, the inverter distribution without frequency modulation frequency modulation function of described micro-grid system to intermediate frequency regulating power be 0, i-th inverter distribution to intermediate frequency regulating power be designated as P
zi, the intermediate frequency regulating power that all inverter distribution in micro-grid system arrive and be low frequency regulate gross power P
z.The execution cycle that intermediate frequency stabilizes step can not be set to a few tens of milliseconds to a few minutes not etc., and depend primarily on the computing capability of controller, the execution cycle is shorter, performs frequency higher, and the effect that power is stabilized is also better.After each execution intermediate frequency stabilizes step, just upgrade the intermediate frequency regulating power of each inverter of described micro-grid system.
As another embodiment, also intermediate frequency can be stabilized the realtime power of above-mentioned grid-connected node when step starts to perform and new schedule power P
0make difference and obtain difference DELTA P, just the accuracy of this difference DELTA P may slightly decline, but still can select as one, for selecting in some cases.
Power modulating step: the power regulating each inverter of described micro-grid system, the regulating power of i-th inverter is P
di+ P
zi, thus make the power of described grid-connected node follow schedule power P
0, above-mentioned regulating power refers to that corresponding inverter needs to carry out the amount of power adjustments, and the power before utilizing this inverter to regulate is P, and the power after adjustment is then P+(P
di+ P
zi).
In existing frequency modulation frequency modulation algorithm, pi regulator is inputted with P+ β f area control error ACE, for controlling power and the frequency of grid-connected node, the power of the invention is stabilized method and is stabilized in step at intermediate frequency and improve existing frequency modulation frequency modulation algorithm, input pi regulator using Δ P+ β Δ f as area control error ACE, be intended to the power fluctuation controlling grid-connected node.Run the frequency modulation frequency modulation algorithm of this improvement under grid-connect mode, now Δ f is 0, only regulates using P as regulated quantity, can stablize the power realizing grid-connected node and stabilize; Run the frequency modulation frequency modulation algorithm of this improvement under island mode, now grid-connected node inactivity exchanges, and this algorithm is equal to traditional frequency modulation frequency modulation algorithm.When micro-grid system stable state, the power of its inverter is a steady state value, and increment is 0, if Δ P
sfor above-mentioned increment, according to Δ P
s=-K ∫ (Δ P+ β Δ f) dt, Δ P
s=0, known integration item is 0, then ACE=0, and Δ P and Δ f is respectively 0, and this illustrates under the control of the frequency modulation frequency modulation algorithm of this improvement, and when micro-grid system stable state, the power variation of grid-connected node is 0, and the power of grid-connected node follows given (i.e. schedule power P
0), while frequency modulation, suppress the fluctuation of power.
Except above-mentioned three steps, the power of the invention is stabilized method and is also comprised the high frequency carried out in real time and stabilize step, the energy storage inverter be connected with grid-connected node utilizing micro-grid system to arrange gathers the realtime power of grid-connected node, then send into high pass filter and extract high frequency power signals, according to this high frequency power signals and schedule power P
0, adopt DPC algorithm to control the power of energy storage inverter to described grid-connected node and compensate, to eliminate the spike burr of the power waveform of grid-connected node, thus make the power of described grid-connected node follow schedule power P
0.
Described DPC algorithm is specially, according to real-time voltage and the real-time current of the grid-connected node of energy storage inverter collection, calculate active power fluctuation value p and reactive power fluctuation value q, then by their send into high pass filter to extract high frequency power fluctuation signal p ' and q ', then by p ' and q ' respectively with set-point p '
0and q '
0deviation send into corresponding controller, produce according to the output of controller and bulk power grid voltage vector position the power switch pipe that drive singal drives energy storage inverter.Above-mentioned controller can be PI controller can be also PR controller, is determined on a case-by-case basis.Above-mentioned controller is high bandwidth controller, thus effectively can follow fundamental power and more high order power.In order to compensate the high frequency power fluctuation of grid-connected node, by p '
0and q '
0all be set as 0, through DPC algorithm, the high frequency power making grid-connected node is 0, reaches the object that power is stabilized.
The method provided herein, all or part of step wherein by setting up functional module construction, can have been come by computer program instructions computer for controlling system.These computer program instructions store in a computer-readable storage medium.
Finally should be noted that; above embodiment is only in order to illustrate the technical scheme of the invention; but not the restriction to the invention protection range; although done to explain to the invention with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to the technical scheme of the invention or equivalent replacement, and not depart from essence and the scope of the invention technical scheme.
Claims (8)
1. the power of the grid-connected node of micro-grid system stabilizes method, it is characterized in that, comprising:
Low frequency stabilizes step: obtain the realtime power of described grid-connected node or the average power of nearest certain time, by itself and schedule power P
0make difference and obtain difference DELTA P, then this difference DELTA P is inputted pi regulator, the output of pi regulator regulates gross power P as low frequency
d, this low frequency is regulated gross power P
ddistribute to each inverter of described micro-grid system, i-th inverter distribution to low frequency regulating power be designated as P
di;
Intermediate frequency stabilizes step: obtain the average power in the realtime power of described grid-connected node or preset time period, and obtain the real-time frequency of described grid-connected node, by the average power in the realtime power of described grid-connected node or preset time period and schedule power P
0make difference and obtain difference DELTA P, by the real-time frequency of described grid-connected node and the given frequency f of described micro-grid system
0make difference and obtain difference DELTA f, make area control error ACE=Δ P+ β Δ f, wherein β is frequency bias coefficient, then area control error ACE is inputted pi regulator, and the output of pi regulator regulates gross power P as intermediate frequency
z, this intermediate frequency is regulated gross power P
zdistribute to the inverter that each of described micro-grid system has frequency modulation frequency modulation function, the inverter distribution without frequency modulation frequency modulation function of described micro-grid system to intermediate frequency regulating power be 0, i-th inverter distribution to intermediate frequency regulating power be designated as P
zi;
Perform frequency that intermediate frequency stabilizes step higher than the frequency performing low frequency and stabilize step, each low frequency that performs is stabilized after step or intermediate frequency stabilize step, just upgrades low frequency regulating power or the intermediate frequency regulating power of each inverter of described micro-grid system;
Power modulating step: the power regulating each inverter of described micro-grid system in real time, the regulating power of i-th inverter is P
di+ P
zi, follow schedule power P to make the power of described grid-connected node
0.
2. the power of the grid-connected node of micro-grid system according to claim 1 stabilizes method, it is characterized in that, also comprises:
High frequency stabilizes step: the realtime power obtaining described grid-connected node, then extracts high frequency power signals by high pass filter, according to this high frequency power signals and schedule power P
0control the power of energy storage device to described grid-connected node to compensate, follow schedule power P to make the power of described grid-connected node
0.
3. the power of the grid-connected node of micro-grid system according to claim 2 stabilizes method, it is characterized in that, described energy storage device is energy storage inverter, and it is connected with described grid-connected node.
4. the power of the grid-connected node of micro-grid system according to claim 2 stabilizes method, it is characterized in that, adopts DPC algorithm to control the power of described energy storage device to described grid-connected node and compensates.
5. the power stabilizing device of the grid-connected node of micro-grid system, is characterized in that, comprising:
Low frequency stabilizing device: obtain the realtime power of described grid-connected node or the average power of nearest certain time, by itself and schedule power P
0make difference and obtain difference DELTA P, then this difference DELTA P is inputted pi regulator, the output of pi regulator regulates gross power P as low frequency
d, this low frequency is regulated gross power P
ddistribute to each inverter of described micro-grid system, i-th inverter distribution to low frequency regulating power be designated as P
di;
Intermediate frequency stabilizing device: obtain the average power in the realtime power of described grid-connected node or preset time period, and obtain the real-time frequency of described grid-connected node, by the average power in the realtime power of described grid-connected node or preset time period and schedule power P
0make difference and obtain difference DELTA P, by the real-time frequency of described grid-connected node and the given frequency f of described micro-grid system
0make difference and obtain difference DELTA f, make area control error ACE=Δ P+ β Δ f, wherein β is frequency bias coefficient, then area control error ACE is inputted pi regulator, and the output of pi regulator regulates gross power P as intermediate frequency
z, this intermediate frequency is regulated gross power P
zdistribute to the inverter that each of described micro-grid system has frequency modulation frequency modulation function, the inverter distribution without frequency modulation frequency modulation function of described micro-grid system to intermediate frequency regulating power be 0, i-th inverter distribution to intermediate frequency regulating power be designated as P
zi;
Run the frequency of intermediate frequency stabilizing device higher than the frequency running low frequency stabilizing device, after each run low frequency stabilizing device or intermediate frequency stabilizing device, just upgrade low frequency regulating power or the intermediate frequency regulating power of each inverter of described micro-grid system;
Power Conditioning Unit: the power regulating each inverter of described micro-grid system in real time, the regulating power of i-th inverter is P
di+ P
zi, follow schedule power P to make the power of described grid-connected node
0.
6. the power stabilizing device of the grid-connected node of micro-grid system according to claim 5, is characterized in that, also comprise:
High frequency stabilizing device: the realtime power obtaining described grid-connected node, then extracts high frequency power signals by high pass filter, according to this high frequency power signals and schedule power P
0control the power of energy storage device to described grid-connected node to compensate, follow schedule power P to make the power of described grid-connected node
0.
7. the power stabilizing device of the grid-connected node of micro-grid system according to claim 6, is characterized in that, described energy storage device is energy storage inverter, and it is connected with described grid-connected node.
8. the power stabilizing device of the grid-connected node of micro-grid system according to claim 6, is characterized in that, adopts DPC algorithm to control the power of described energy storage device to described grid-connected node and compensates.
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| CN104393607B (en) | 2016-08-24 |
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