CN102545255A - Photovoltaic and micro gas turbine mixed micro grid coordinated operation control method - Google Patents

Photovoltaic and micro gas turbine mixed micro grid coordinated operation control method Download PDF

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CN102545255A
CN102545255A CN2011104423139A CN201110442313A CN102545255A CN 102545255 A CN102545255 A CN 102545255A CN 2011104423139 A CN2011104423139 A CN 2011104423139A CN 201110442313 A CN201110442313 A CN 201110442313A CN 102545255 A CN102545255 A CN 102545255A
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power
gas turbine
photovoltaic
controller
miniature gas
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周念成
王强钢
邓浩
池源
谢光莉
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Chongqing University
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Chongqing University
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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
    • 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
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Abstract

The invention discloses a photovoltaic and micro gas turbine mixed micro grid coordinated operation control method. According to the frequency characteristics of photovoltaic and load power, a frequency conversion long-time series method is put forward to predict the photovoltaic and load power so as to adjust the previous output of power of a micro gas turbine. During the synchronous operation of a mixed micro grid, by using the controllable smooth photovoltaic power fluctuation of the micro gas turbine, the mixed micro grid becomes a schedulable power source; and during island operation, a prediction algorithm is added in the power control of the micro gas turbine, and the output of the micro gas turbine is previously scheduled, so that the difference of the photovoltaic and load power is commonly compensated by the micro gas turbine and an energy storage battery, thereby realizing the stable operation of the mixed micro grid. According to the invention, the fluctuation of a photovoltaic generation system can be decreased, and the problems of slow dynamic response speed and delay of the micro gas turbine can be overcome, so that the coordinated operation control of the mixed micro grid under synchronous and island states can be realized.

Description

Photovoltaic and miniature gas turbine mixing microgrid coordinated operation control method
Technical field
The present invention relates to little electrical network grid-connected coordination operation control technology, especially a kind of photovoltaic and miniature gas turbine mixing microgrid coordinated operation control method belong to electric power network control technology field.
Background technology
Serious day by day along with energy crisis and environmental pollution, the microgrid technology has become the research focus as a kind of feasible solution.The little source of photovoltaic with aboundresources, distribute extensively, characteristics such as cleaning become one of regenerative resource of tool potentiality to be exploited.Because photovoltaic generation has obvious intermittence, it is bigger that power output is influenced by Changes in weather, adds controlled little source or distributed energy storage and mix microgrid with complementary formation of photovoltaic generation, can improve the reliability of photovoltaic generation.In controlled little source; The miniature gas turbine generating can be supplied the cool and thermal power load simultaneously; Have discharging less, advantage such as efficient height and fuel tolerance be good; Become the most promising distributed power source in the supply of cooling, heating and electrical powers microgrid, therefore study photovoltaic and miniature gas turbine composition mix the microgrid operation characteristic and coordination control strategy has great importance.
The microgrid technology as distributed energy to mains supply efficiently utilize platform, in the distributed power generation technical development, have very important effect, with power system security, stable and economical operation is closely bound up.The microgrid technology is a novel electric power electric technology, distributed power generation is technological, renewable energy power generation is technological and energy storage technology comprehensive, has following characteristics are arranged:
1. microgrid provides the mode that the DG unit is used in an effective integration, inherits to have had the advantage that all independent DG systems are had;
2. microgrid can not have a negative impact to the utility network fail safe as an integral module independently, need not make amendment to the operation strategy of utility network;
3. microgrid can insert the DG unit or disconnection with flexible way, and promptly the DG unit has " plug and play " ability (plug-and-play);
4. many problems of being incorporated into the power networks of DG unit all are to be caused by DG cell response speed characteristics slow, that inertia is little; The microgrid of many DG unit networking has increased power system capacity; And corresponding energy-storage system (batteries to store energy system, flywheel energy storage system etc.) arranged; System inertia is increased, weakened voltage fluctuation and voltage flicker phenomenon, improved the quality of power supply;
5. the DG unit can be various energy resources form (photoelectricity, wind-powered electricity generation, a miniature gas turbine etc.) in the microgrid; Can also be with cogeneration of heat and power (combined heat and power; CHP) or CCHP (combined cold heat and power; CCHP) form exists, and to the user heat energy is provided on the spot, has improved DG unit by using efficient;
6. microgrid can independent operation continue to ensure power supply when higher level's network breaks down, and improves power supply reliability.
Wherein, the ability of isolated island (independently) operation is the microgrid most important character.From the user load side, microgrid can be regarded the electric power system of an autonomy as, and it can satisfy the requirement of user to power quality and reliability.From big electrical network one side, microgrid is a modular integral body just as generator in the electrical network or load.
Because the wave characteristic of photovoltaic generating system power output; Must there be matching problem with controlled little source or energy storage device; Compare with other controlled little sources; Miniature gas turbine have the life-span long, reliability is high, fuel tolerance good, environmental pollution is little and be convenient to advantage such as flexibly control, and response speed is very fast, just can respond fast-changing load in the DC side configuration than the energy storage device of low capacity.The domestic and international research scholar has done a large amount of research to photovoltaic generation at present; Comprise the photovoltaic generating system that is incorporated into the power networks with islet operation; The control strategy of MPPT maximum power point tracking control (MPPT), island detection and the inverter of photovoltaic array etc.; All have certain characteristics separately; Promoted the development of photovoltaic generation industry to a great extent, but it is also less relatively to reach the research that cooperates with other little sources for the application of photovoltaic generation in microgrid, and these all consider the switching of being incorporated into the power networks of mixing microgrid and two kinds of operational modes of grid-connected island.
Summary of the invention
The photovoltaic generating system that exists to the prior art slow shortcoming with time-delay of fluctuation and miniature gas turbine dynamic responding speed of exerting oneself; The purpose of this invention is to provide a kind of new photovoltaic and miniature gas turbine mixing microgrid coordinated operation control system method; Reducing the fluctuation that photovoltaic generating system exerts oneself and to overcome the slow problem with time-delay of miniature gas turbine dynamic responding speed, realize controlling with the coordinated operation that island state mixes microgrid down to being incorporated into the power networks.
To achieve these goals, the technical scheme of the present invention's employing is such:
Photovoltaic and miniature gas turbine mixing microgrid coordinated operation control method; This control method relates to the photovoltaic generating system, micro-gas-turbine machine power generating system and the storage battery that insert power distribution network respectively through points of common connection and fills electricity generation system, the points of common connection place be provided with make microgrid be incorporated into the power networks and the isolated island two condition between the static switch that switches; Said photovoltaic generating system comprises photovoltaic array, MPPT controller, PQ controller and the combining inverter that connects successively; Said micro-gas-turbine machine power generating system comprises micro-gas-turbine machine controller, miniature gas turbine, two PWM current transformer, PQ controller and V/F controller, it is characterized in that:
When the mixing microgrid is incorporated into the power networks, make microgrid as independent controllable, through the maximum power P of sampled light photovoltaic generating system output PvWith this locality load P LoadAnd injection power distribution network value and power reference P GrefRealize its prediction algorithm; Work as dP=P Gref+ P Load-P Pv＞0 o'clock, the output valve P of its prediction algorithm Mtref=P Gref+ P Load-P Pv, by miniature gas turbine output specified power P Mtref, then with couple actual power P of PWM current transformers output MtDraw the output signal of controller jointly as the input signal of PQ controller and V/F controller,, finally realize real output P as the input signal of two PWM current transformers MtControl; Work as dP=P Gref+ P Load-P Pv＜0 o'clock, unnecessary power charged a battery;
When mixing the piconet island operation, miniature gas turbine value and power reference P Mtref=P Load-P Pv, work as P Mtref＜0 o'clock, the miniature gas turbine power output was 0; Work as P Mtref＞0 o'clock, miniature gas turbine was exported by power instruction, through the prediction algorithm prediction, and again through behind the time delay τ of miniature gas turbine itself, output actual power P Mt, while P MtrefRemaining power section is provided by storage battery.
Further; The power electronics interface that said storage battery fills electricity generation system adopts the double convertor structure, and accumulator array is divided into the N group, and N is the integer greater than 3; By the power adjustments effect all storage batterys are divided into the subsequent use and power back-off two states of energy; Switch to PQ controller and V/F controller grid-connected converter DC side through dc switch, wherein PQ controller control mode is identical with miniature gas turbine inverter control mode, and the V/F controller adopts to be decided voltage and decide FREQUENCY CONTROL; Grid-connected converter and switch on-off control acting in conjunction realize the control to accumulator array through dc switch again in dc switch.
Said prediction algorithm adopts the variable step time series method, and the Z domain model of variable step prediction algorithm does
G emcp ( z ) = z L 2 - z - L 2 L ( z 1 2 - z - 1 2 ) z - L - 1 2 + T p T s ( M L ) 2 ( 1 - z - L M ) 2 1 - z - 1 Σ t = 1 M - 1 w i z - t - 1 M L
In the formula, L is a time step, and L=15N/24～30N/24, N are sampling number; Predicted time is measured T in advance p=(L-1) T s/ 2+ τ, τ are miniature gas turbine time of delay, T sSampling period; M is the number of partitions, is about to N sampled point and is divided into M zone; w iBe weight coefficient, its value
Figure BDA0000125075220000032
And
Figure BDA0000125075220000033
Said time step L changes according to weather conditions, when the same day, vaporous condition fluctuation was big, suitably reduces time step L; Vaporous condition fluctuation on the same day hour suitably increases time step L.
Compared with prior art, the present invention has the following advantages:
1. pass through user-defined photovoltaic array element and maximal power tracing (MPPT) controller component developed; Built the photovoltaic generating system model; User-defined photovoltaic array element can be good at describing photovoltaic cell typical characteristics curve; And the conductance increment method is adopted in maximal power tracing (MPPT) control, leads with electricity through the instantaneous electricity that compares photovoltaic array and leads variable quantity, calculates DC reference voltage in real time; And can under certain intensity of illumination and temperature, make photovoltaic array work in maximum power point.
2. adopt variable step time series method prediction photovoltaic and load equivalent power curve, the forward scheduling miniature gas turbine is exerted oneself, and selects suitable step-length according to different weather conditions, has improved the adaptability of EMAP algorithm to weather.
Photovoltaic and miniature gas turbine mixing microgrid be incorporated into the power networks, isolated island and be incorporated into the power networks and the isolated island model switches the operation characteristic under three kinds of states; With do not add prediction algorithm and compare; Add variable step time series method can effectively suppress the to be incorporated into the power networks power fluctuation of interconnection, energy storage battery configuration capacity when reducing isolated island.
4. storage battery adopts the grouping module model, and it is divided into the subsequent use and power back-off two states of energy, carries out suitable selection according to coordination control strategy, has improved the operational efficiency of storage battery, guarantees the stability of microgrid operation.
Description of drawings
Fig. 1 is control principle figure of the present invention.
Fig. 2 is a storage battery direct-current switch cabinet structure chart of the present invention.
Fig. 3 is accumulator array state switching law figure of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail.
Referring to Fig. 1; The present invention includes photovoltaic generating system, micro-gas-turbine machine power generating system and storage battery and fill electricity generation system; And points of common connection (PCC), insert power distribution network through points of common connection, the points of common connection place be provided with make microgrid be incorporated into the power networks and the isolated island two condition between the static switch that switches.
Said photovoltaic generating system is made up of photovoltaic array, MPPT controller, PQ controller and combining inverter module.Photovoltaic generating system has been developed user-defined photovoltaic array control element through utilizing the Mathematical Modeling of photovoltaic array, and the current signal through its output drives a constant-current source element, has promptly simulated actual photovoltaic array device; Utilize MPPT controller (admittance method of addition) then,,, find photovoltaic array operating voltage of correspondence during Maximum Power Output under definite illumination S and temperature T condition through relatively optimizing through detecting the power output of photovoltaic array under different operating point; Utilize PQ controller and combining inverter module again, realize decoupling zero control and two functions of MPPT maximum power point tracking of photovoltaic array power output, at last through the maximum power P of step-up transformer output PVSend into points of common connection PCC.Photovoltaic DC-to-AC converter adopts the current tracking control strategy, and its control structure is two closed-loop controls of power outer shroud current inner loop.
Said micro-gas-turbine machine power generating system is made up of micro-gas-turbine machine controller, miniature gas turbine, two PWM current transformer, PQ controller and V/F controller (one of them controller that only drawn among Fig. 1 is the PQ controller).The input signal of miniature gas turbine is with exhaust temperature reference value T RefWith speed reference ω RefBe the signal of benchmark, control the output signal of miniature gas turbine through the micro-gas-turbine machine controller, then through the resulting value and power reference P that follows of prediction algorithm MtrefWith follow power P by the output signal of two PWM current transformers MtRegulate the output signal of PQ controller and V/F controller jointly, at last by the output signal acting in conjunction of this signal and miniature gas turbine in two PWM current transformers, follow power P with this output signal of controlling it Mt, promptly two PWM current transformers and PQ controller are the processes of two mutual circulation, its final output signal is for following power P Mt
Come to introduce in detail exhaust temperature reference value T below RefWith speed reference ω RefDuring input signal, how to realize respectively controlling:
Micro-gas-turbine machine controller and miniature gas turbine are total comprises rotating speed and acceleration control system, temperature control system, fuel supply and parts such as combustion chamber and compressor-turbine system.The revolution speed control system of miniature gas turbine is divided into has difference and indifference dual mode, and under the situation of mixing the lonely network operation of microgrid, when miniature gas turbine was incorporated micro power network into, control system should adopt poor regulative mode, and input signal is reference rotation velocity ω RefWith the deviation of micro-gas-turbine machine power generating system actual rotor rotating speed, obtain its output signal fuel fiducial value through adopting leading-hysteresis transfer function to control; Acceleration controller is compared change in rotational speed rate and given rotating speed acceleration fiducial value, if relative speed variation greater than set-point, reduces the Acceleration Control value so, otherwise increases the Acceleration Control value, controls its fuel fiducial value with this; Temperature control reflects the gas turbine turbine-inlet temperature through the control fuel flow rate, utilizes exhaust temperature signal that thermocouple measurement arrives as input, then with specified exhaust temperature T RefCompare, the output temperature control signal is to minimum value selector.As long as have deviation between exhaust temperature signal and the specified exhaust temperature, temperature controller is integration constantly, makes the reduction of fuel fiducial value, till exhaust temperature signal is lower than specified exhaust temperature; The fuel benchmark that then revolution speed control system, temperature control system and acceleration control system is produced respectively after minimum value selector and the effect of high-low limits module, produces the order of minimum fuel benchmark and gets into fuel feed system.Because rotating speed, the fuel pressure of petrolift are all proportional with rotor speed, so on duty with actual rotor rotating speed w behind the amplitude limit just obtains natural fuel amount signal; This signal directly drives the built-in high-speed engine of gas turbine drives through compressor-turbine system again.
What prediction algorithm adopted is to improve the variable step time series method.When SBR=1, static switch BR is closed, mixes microgrid and is in the state of being incorporated into the power networks, and power distribution network adjustable power degree is realized injecting in each little source on the basis of satisfying local load; When SBR=0, static switch BR breaks off, and mixes microgrid and is in the islet operation state, bears load power P jointly by photovoltaic array, miniature gas turbine and storage battery Load
When the mixing microgrid is incorporated into the power networks, adopt the interconnection power control mode, make microgrid as independent controllable, local load P is being satisfied in each little source LoadThe basis on, make and inject power distribution network adjustable power degree, through sampling Maximum Power Output P PvWith this locality load P Load, and combine to inject power distribution network value and power reference P GrefRealize its prediction algorithm.Work as dP=P Gref+ P Load-P Pv＞0 o'clock, the output valve P of its prediction algorithm Mtref=P Gref+ P Load-P PvSo, by miniature gas turbine output specified power P Mtref, then with couple actual power P of PWM current transformers output MtDraw the output signal of controller jointly as the input signal of PQ controller and V/F controller,, finally realize real output P as the input signal of two PWM current transformers MtControl, promptly realized forward scheduling to the miniature gas turbine power output; Work as dP=P Gref+ P Load-P Pv＜0 o'clock, unnecessary power charged a battery.
When mixing the piconet island operation, miniature gas turbine value and power reference P Mtref=P Load-P Pv, work as P Mtref＜0 o'clock, the miniature gas turbine power output was 0, works as P Mtref＞0 o'clock, miniature gas turbine was exported by power instruction, through the prediction algorithm prediction, and again through behind the time delay τ of miniature gas turbine itself, output actual power P Mt, while P MtrefRemaining power section is provided by storage battery, adopts this prediction mode to regulate miniature gas turbine output in advance, can effectively increase miniature gas turbine and exert oneself, and reduces the configuration capacity of storage battery.Consider the influence of weather conditions to prediction effect, adopt the variable step time series method to adapt with different weather conditions, different weather adds different factors of influence, so the Z domain model of variable step prediction algorithm does
G emcp ( z ) = z L 2 - z - L 2 L ( z 1 2 - z - 1 2 ) z - L - 1 2 + T p T s ( M L ) 2 ( 1 - z - L M ) 2 1 - z - 1 Σ t = 1 M - 1 w i z - t - 1 M L
In the formula, L is a step-length, and L=15N/24～30N/24, N are sampling number; Predicted time is measured T in advance p=(L-1) T s/ 2+ τ, τ are miniature gas turbine time of delay, T sSampling period; M is the number of partitions (N sampled point is divided into M zone), w iBe weight coefficient, its value
Figure BDA0000125075220000062
And
Figure BDA0000125075220000063
Weather clear to cloudy is reduced rolling average step-length L; The prediction weight of raising formula load data near-mid term; Increase the amplitude of this algorithm at the 0.02Hz-0.06Hz high band; When adopting this algorithm to regulate miniature gas turbine in advance to exert oneself, add strong algorithms and photovoltaic is exerted oneself change the prediction effect of frequent weather clear to cloudy.So the variable step time series method is selected suitable time step according to weather conditions, vaporous condition fluctuation on the same day suitably reduces time step L when big (as clear to cloudy or cloudy turn to fine); During vaporous condition fluctuation on the same day less (like fine day, cloudy day etc.), suitably increase time step L, improve the adaptability of EMAP algorithm weather conditions.
Two PWM current transformers comprise rectifier and inverter.The rectifier model adopts the perfect switch model of potential source rectifier (VSR), and inverter adopts PQ control and V/F control.When load in microgrid supply this locality; Inserting power distribution network through switch BRK is incorporated into the power networks; Promptly when microgrid is incorporated into the power networks,, inverter is adopted PQ control for reducing the impact of microgrid to big electrical network; Export the Power Exchange of controlling itself and electrical network according to given power, the support of voltage and frequency is provided by big electrical network; When big electrical network broke down, switch BRK broke off, and got into islet operation, controlled the voltage and the frequency (being called for short V/F control) of load side through control inverter, with voltage and the frequency of keeping whole microgrid, guaranteed the requirement of load electric energy quality.In addition, the power current of inverter output contains harmonic wave usually, so will install the LC filter additional at inverter output end, the high order harmonic component of filtering switching frequency and adjacent frequency band thereof makes percent harmonic distortion less than 5%.
The micro-gas-turbine machine power generating system has adopted the variable step time series method, and the output of forward scheduling miniature gas turbine makes it can morely bear power high frequency and changes part, has reduced battery capacity.In addition, the micro-gas-turbine machine power generating system has also adopted two PWM inverter controllers, and its rectifier adopts two closed-loop controls, to keep the stable of dc voltage; The control of inverter has been carried out different analyses according to microgrid running status difference, and when microgrid was incorporated into the power networks, inverter adopted PQ control; Meritorious and the reactive power of output appointment; When islet operation, inverter adopts V/F control, keeps the stable of load side voltage and frequency.
Said storage battery fills electricity generation system accumulator array is divided into the N group, and N is the integer more than or equal to 3, is divided into the subsequent use and power back-off two states of energy by the power adjustments effect, switches to PQ control and V/F control current transformer DC side through dc switch.Referring to Fig. 2, be storage battery direct-current switch cabinet structure chart, the switch on-off controller is according to the instruction of storage battery energy manager, and the dc switch of K1 to K4 in the step switch cabinet is realized the modularization management of accumulator array.
Storage battery V/F control current transformer is in blocking when being incorporated into the power networks, and PQ control unsteady flow is mainly used in the charging of standby battery, can carry out regular discharge performance test to storage battery in addition.Choose 3 group storage battery arrays as the energy standby battery; Being full of electricity by PQ control current transformer uses when treating the piconet island operation; Compensation dynamic response miniature gas turbine power adjustments error slowly when reserving 1 group storage battery array and being used for piconet island, the quick variation of level and smooth photovoltaic and load power.
When mixing the piconet island operation; It loses the voltage and the frequency support of big electrical network; The V/F control current transformer of storage battery brings into operation; Storage battery PQ control current transformer is in blocking, and its energy manager is utilized storage battery state-of-charge (the State of Charge of the third-order model on-line monitoring power back-off state of storage battery through detecting the voltage and current of V/F current transformer DC side accumulator array; The energy standby battery that be full of electricity when SOC), control dc switch switching will be incorporated into the power networks switches to the power back-off state one by one.
Accumulator array state switching law is referring to table 3.Accumulator array A, B and C are in the energy stand-by state when being incorporated into the power networks, and microgrid changes that accumulator array C and B switch to the power back-off state successively behind the isolated island over to.Rotation system is adopted in the be incorporated into the power networks selection of standby battery when reconnecting of microgrid, and promptly islet operation finishes to change over to when being incorporated into the power networks, and by the sequencing that drops into the V/F inverter direct-flow side time, preferentially selects the forward storage battery of making time as standby battery.And when isolated island running is incorporated power distribution network into more again,, press the time sequencing that accumulator array D, C and B drop into V/F current transformer side because accumulator array A still is full of electricity and keeps stand-by state constant, selection accumulator array D and C switch to stand-by state.
In case the power output of photovoltaic generating system is greater than the local load of microgrid during isolated island, unnecessary electric energy is the accumulator array charging through the V/F current transformer.Because during the configuration of microgrid battery capacity; Must select the maximum in discharge or the charging capacity; Choose by the maximum charge capacity for fear of the storage battery configuration capacity; Photovoltaic can suitably increase local load capacity when designing with miniature gas turbine mixing piconet networking, also can improve the utilance of miniature gas turbine simultaneously.
This is wherein of paramount importance to be the realization that micro-gas-turbine machine power generating system and storage battery fill the prediction algorithm between the electricity generation system; Pass through prediction algorithm; But make its forward scheduling miniature gas turbine export; Miniature gas turbine just can be born power high frequency variation part morely like this, thereby has reduced battery capacity, has overcome the shortcoming of miniature gas turbine slow-response speed.
Explanation is at last; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although with reference to embodiment the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention; And not breaking away from the aim and the scope of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (5)

1. photovoltaic and miniature gas turbine mixing microgrid coordinated operation control method; This control method relates to the photovoltaic generating system, micro-gas-turbine machine power generating system and the storage battery that insert power distribution network respectively through points of common connection and fills electricity generation system, the points of common connection place be provided with make microgrid be incorporated into the power networks and the isolated island two condition between the static switch that switches; Said photovoltaic generating system comprises photovoltaic array, MPPT controller, PQ controller and the combining inverter that connects successively; Said micro-gas-turbine machine power generating system comprises micro-gas-turbine machine controller, miniature gas turbine, two PWM current transformer, PQ controller and V/F controller, it is characterized in that:
When the mixing microgrid is incorporated into the power networks, make microgrid as independent controllable, through the maximum power P of sampled light photovoltaic generating system output PvWith this locality load P LoadAnd injection power distribution network value and power reference P GrefRealize its prediction algorithm; Work as dP=P Gref+ P Load-P Pv＞0 o'clock, the output valve P of its prediction algorithm Mtref=P Gref+ P Load-P Pv, by miniature gas turbine output specified power P Mtref, then with couple actual power P of PWM current transformers output MtDraw the output signal of controller jointly as the input signal of PQ controller and V/F controller,, finally realize real output P as the input signal of two PWM current transformers MtControl; Work as dP=P Gref+ P Load-P Pv＜0 o'clock, unnecessary power charged a battery;
When mixing the piconet island operation, miniature gas turbine value and power reference P Mtref=P Load-P Pv, work as P Mtref＜0 o'clock, the miniature gas turbine power output was 0; Work as P Mtref＞0 o'clock, miniature gas turbine was exported by power instruction, through the prediction algorithm prediction, and again through behind the time delay τ of miniature gas turbine itself, output actual power P Mt, while P MtrefRemaining power section is provided by storage battery.
2. photovoltaic according to claim 1 and miniature gas turbine mixing microgrid coordinated operation control method; It is characterized in that: the power electronics interface that said storage battery fills electricity generation system adopts the double convertor structure; Accumulator array is divided into the N group; N is the integer greater than 3, by the power adjustments effect all storage batterys is divided into the subsequent use and power back-off two states of energy, switches to PQ controller and V/F controller grid-connected converter DC side through dc switch; Wherein PQ controller control mode is identical with miniature gas turbine inverter control mode, and the V/F controller adopts to be decided voltage and decide FREQUENCY CONTROL; Grid-connected converter and switch on-off control acting in conjunction realize the control to accumulator array through dc switch again in dc switch.
3. photovoltaic according to claim 1 and 2 and miniature gas turbine mixing microgrid coordinated operation control method is characterized in that: said prediction algorithm adopts the variable step time series method, and the Z domain model of variable step prediction algorithm does
G emcp ( z ) = z L 2 - z - L 2 L ( z 1 2 - z - 1 2 ) z - L - 1 2 + T p T s ( M L ) 2 ( 1 - z - L M ) 2 1 - z - 1 Σ t = 1 M - 1 w i z - t - 1 M L
In the formula, L is a time step, and L=15N/24～30N/24, N are sampling number; Predicted time is measured T in advance p=(L-1) T s/ 2+ τ, τ are miniature gas turbine time of delay, T sSampling period; M is the number of partitions, is about to N sampled point and is divided into M zone; w iBe weight coefficient, its value
Figure FDA0000125075210000021
And
Figure FDA0000125075210000022
4. photovoltaic according to claim 3 and miniature gas turbine mixing microgrid coordinated operation control method, it is characterized in that: said time step L changes according to weather conditions, when the same day, vaporous condition fluctuation was big, suitably reduces time step L; Vaporous condition fluctuation on the same day hour suitably increases time step L.
5. photovoltaic and miniature gas turbine mixing microgrid coordinated operation control method; This control method relates to the photovoltaic generating system, micro-gas-turbine machine power generating system and the storage battery that insert power distribution network respectively through points of common connection and fills electricity generation system, the points of common connection place be provided with make microgrid be incorporated into the power networks and the isolated island two condition between the static switch that switches; It is characterized in that: the power electronics interface that said storage battery fills electricity generation system adopts the double convertor structure; Accumulator array is divided into the N group; N is the integer greater than 3, by the power adjustments effect all storage batterys is divided into the subsequent use and power back-off two states of energy, switches to PQ controller and V/F controller grid-connected converter DC side through dc switch; Wherein PQ controller control mode is identical with miniature gas turbine inverter control mode, and the V/F controller adopts to be decided voltage and decide FREQUENCY CONTROL; Grid-connected converter and switch on-off control acting in conjunction realize the control to accumulator array through dc switch again in dc switch.
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