CN101512866A - Micro-grid system construction method - Google Patents
Micro-grid system construction method Download PDFInfo
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- CN101512866A CN101512866A CNA2007800329430A CN200780032943A CN101512866A CN 101512866 A CN101512866 A CN 101512866A CN A2007800329430 A CNA2007800329430 A CN A2007800329430A CN 200780032943 A CN200780032943 A CN 200780032943A CN 101512866 A CN101512866 A CN 101512866A
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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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
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Abstract
A method for building a microgrid system wherein a network is built which integratively controls and operates distributed power supplies including a plurality of types of power supplies so as to supply a power to a particular area. The method comprises a step of determining load variations of the particular area to frequency analyze the data of the load variations; and a step of deciding, based on the frequency response characteristics of the plurality of types of power supplies, share frequencies of which the respective ones of the plurality of types of power supplies take charge, allocating, based on the share frequencies, a frequency analysis result of the load variations to the respective one of the plurality of types of power supplies, and determining a capacity required of the respective one of the plurality of types of power supplies.
Description
Technical field
The present invention relates to the construction method that distributed power source by multiple class carries out the micro-grid system (microgrid system) that the structure after the networking forms.
Background technology
As everyone knows, in recent years, in the exploitation of the various distributed power sources that advance natural gas Thermoelectric cogeneration (cogeneration) and fuel cell and so on.By adopting such distributed power source as oneself generating equipment in the building, obtain the thermoelectric good complex energy efficient that produces of supplying with, can expect the discharge rate reduction of global warming gas, can realize the cost cutting that the simplification of the reduction of contract electric power amount of commercial system (from purchasing of Utilities Electric Co.) and controller switching equipment brings, the various benefits that the autonomous stability when having earthquake calamity and fire is also guaranteed and so on easily.Therefore, used the electric power dispatching system of distributed power source, the trend of popularizing has widely been arranged from now on, for example proposed distributed power source by the mutual general system's (for example, with reference to patent documentation 1) of a plurality of users of needs.
; in the electric power dispatching system that has used above-mentioned distributed power source; make described distributed power source carry out basic load (base load) operation if use distributed power source and commercial system (power network of Utilities Electric Co.) simultaneously; then become auxiliary (ancillary) function that Utilities Electric Co. bears voltage or frequency variation by oneself, only in commercial system, seek the compensation of load change and the burden of Utilities Electric Co. is increased.Therefore, in recent years, proposed to make the technology of distributed power source load-following operation.For example, the technology of optimum operation has been proposed, so that a plurality of distributed power sources and a plurality of micro-grid system integral body of user networkization that needs are unified control and the follow load change.According to such technology, not only can alleviate the burden of the load change compensation that suffers on the commercial system, and because load change compensation does not rely on commercial system, so can realize being independent of the operation (autonomous operation) (for example, with reference to patent documentation 2) of the micro-grid system of commercial system.
Patent documentation 1: the spy opens communique 2002-No. 238168
Patent documentation 2: the spy opens the 2005-160286 communique
Summary of the invention
The problem that invention will solve
But, carry out load-following operation in order to make above-mentioned micro-grid system be connected to commercial system, require the balance between generating and the load (needs) consistent all the time.In addition, under the situation of autonomous operation, require the electric power of stable supplying stabilized quality in the scope of this system, require the balance between instantaneous generating and the load consistent all the time making micro-grid system be independent of commercial system.In the system that the small-scale distributed power source such by micro-grid system constitutes, worried that balance between supply and demand because of electric power degenerates greatly to lose power quality.That is, the electric power of the stabilized quality when load-following operation when realizing that commercial system connects and autonomous operation is supplied with, and must make the balance between generating and the load consistent all the time.
The present invention is the invention of having considered above-mentioned problem in the past, its purpose is, provide by from the selection of power supply and the decision stage of formation, can be implemented in balanced operation on the performance of each power supply, thereby can make the construction method of the micro-grid system of the balance unanimity between generating and the load.
Be used to solve the scheme of problem
The present invention is the construction method of micro-grid system, be used to construct with the distributed power source that comprises multiple class power supply control uniformly utilization network and to the specific region supply capability, it is characterized in that, this method comprises: measure the load change of described specific region, thereby the data of described load change are carried out the step of frequency analysis; And based on the frequency response characteristic separately of each power supply and determine that each power supply undertakes separately share frequency (share frequency), and share frequency and the frequency analysis result of load change is distributed to each power supply based on described, in the hope of step to the capacity of each power requirement of each power supply.
According to such feature, because the measurement data of load change is by frequency analysis, the load change of the specific region that the coincidence of the load change of various speed of the load change from very slow load change to moment constitutes is decomposed into each frequency component and is grasped.In addition, different separately Steam Generator in Load Follow characteristics (response characteristic) is arranged in the power supply of multiple class, but determine the frequency of sharing that each power supply undertakes respectively based on each frequency response characteristic.Then, share frequency and frequency analysis result (each frequency component after the decomposition) is distributed to each power supply, so each power supply is undertaken the frequency band that is fit to separately respectively based on this.And, by said frequencies analysis result and share frequency, calculate the capacity of each power supply respectively, so power supply is suitable capacity.
In addition, the present invention also can distribute by the transition probability that generates the load variations amount and at least one side of the transition probability distribution of load changing rate, determines the measuring period of described load change.
Thus, the transition probability of only observing load variations amount or load changing rate distributes, and just can find out the load change that can catch what degree according to measuring period, thus can make necessary measuring period clear and definite, so that compensate load change suitably.
In addition, the present invention also can be for fuel consumption formula power supply, generating efficiency during the generating efficiency during based on steady operation and transition operation and estimate the combustion expense characteristic of described fuel consumption formula power supply, and determine the utilization of described fuel consumption formula power supply based on this evaluation result.
Thus, the fuel consumption formula that can turn round expeditiously power supply can reduce the combustion expense of described power supply, and realizes having considered the utilization of the micro-grid system of economy.
In addition, the present invention also can carry out the evaluation to the system frequency change of load change for rotary generator formula power supply, determines the scope of the output valve of described rotary generator formula power supply based on this evaluation result.
Thus, can the change of system frequency be converged in the deviation of regulation, can guarantee the power quality of expecting only when distributed power source carries out autonomous operation that electric power supplies with.
And the present invention also can connect the pseudo-load (dummy load) of checking usefulness and construct the virtual system of simulation on described rotary generator formula power supply, and uses described virtual system to carry out evaluation to the change of the system frequency of described load change.
Thus, when actual loads such as electrical installation are estimated, have because of low-quality electric power causes the misgivings of fault to described actual load, and by using pseudo-load to estimate, can carry out other evaluation of system frequency level and actual load is broken down.
The invention effect
Construction method according to micro-grid system of the present invention, based on the response performance of the speed (frequency component) of load change and distributed power source and construct micro-grid system, so can suitably catch the load change of object by way of compensation and carry out the compensation of high efficiency load change, and the capacity optimization of distributed power source can be able to be prevented the off-capacity or the redundant equipment of distributed power source.Like this,, just consider and on the performance of each distributed power source, can realize balanced operation, so can make generating in the micro-grid system and the balance unanimity between the load from the selection of distributed power source or the decision stage of formation.
Description of drawings
Fig. 1 is the figure of the schematic configuration of the expression micro-grid system that is used to illustrate embodiments of the present invention.
Fig. 2 is the curve chart of the measurement result of the expression daily load fluctuation that is used to illustrate embodiments of the present invention.
Fig. 3 is the figure of the generation method that distributes of the transition probability of the expression load variations amount that is used to illustrate embodiments of the present invention.
Fig. 4 is the figure of the generation method that distributes of the transition probability of the expression load changing rate that is used to illustrate embodiments of the present invention.
Fig. 5 A is the curve chart that the transition probability of the expression load variations amount that is used to illustrate embodiments of the present invention distributes.
Fig. 5 B is the curve chart that the transition probability of the expression load changing rate that is used to illustrate embodiments of the present invention distributes.
Fig. 6 A is the curve chart that the transition probability of the expression load variations amount that is used to illustrate embodiments of the present invention distributes.
Fig. 6 B is the curve chart that the transition probability of the expression load changing rate that is used to illustrate embodiments of the present invention distributes.
Fig. 7 is the frequency analysis result's of the expression load change that is used to illustrate embodiments of the present invention a curve chart.
Fig. 8 A is that expression is used to illustrate curve chart embodiments of the present invention, that make the response characteristic under the situation after command value changes with the frequency sinusoidal wave shape ground identical with the limit of response.
Fig. 8 B is that expression is used to illustrate curve chart embodiments of the present invention, that make the response characteristic under the situation after command value changes with the doubled frequency sinusoidal wave shape ground with the limit that responds.
Fig. 9 A is the curve chart that expression is used to illustrate the amplitude ratio of the sinewave output value of embodiments of the present invention and sinusoidal wave command value.
Fig. 9 B is the curve chart that expression is used to illustrate the phase difference of the sinewave output value of embodiments of the present invention and sinusoidal wave command value.
Figure 10 is the curve chart that expression is used to illustrate the frequency analysis of the load change that the Ni-MH battery of embodiments of the present invention is undertaken.
Figure 11 A is the curve chart of the generating efficiency of expression when being used to illustrate the steady operation of embodiments of the present invention.
Figure 11 B is the curve chart of the generating efficiency of expression when being used to illustrate the transition operation of embodiments of the present invention.
The curve chart of the system frequency change during Figure 12 A slope operation (rampoperation) that has been expression the carrying out that be used to illustrate embodiments of the present invention.
The curve chart of the system frequency change during sinusoidal wave operation that Figure 12 B is expression the carrying out that is used to illustrate embodiments of the present invention.
Figure 13 be expression be used to illustrate embodiments of the present invention carry out the evaluation of system frequency rank (level) time the schematic diagram of system.
Label declaration
1... micro-grid system, 2... gas engine (gas engine) A (power supply), 3... gas engine B (power supply), 4... Ni-MH battery (power supply), 5... double charge layer capacitor (power supply), 9... load, the pseudo-load of 10...
Embodiment
Below, based on the execution mode of the construction method of description of drawings micro-grid system of the present invention.Have, present embodiment is the specific region with certain facility again, and the situation of constructing micro-grid system 1 in this facility is that example describes.
The micro-grid system 1 of present embodiment at first, is described.
Fig. 1 is the synoptic diagram of schematic configuration of the micro-grid system 1 of expression present embodiment.
As shown in Figure 1, the micro-grid system 1 of present embodiment be the distributed power source 20 usefulness control assemblies 6 of constructing the power supply (gas engine A (2), gas engine B (3), Ni-MH battery 4, double charge layer capacitor 5) that will comprise multiple class control uniformly utilization network and to the system of load 9... (electric equipment etc.) supply capability of specific region.This micro-grid system 1 is connected to commercial system 7 by being subjected to electricity point P.Being subjected to electricity point P, switch 8 is set, can freely make micro-grid system 1 be connected to commercial system 7 by switching this switch or separate from commercial system 7.Therefore, when micro-grid system 1 is connected to commercial system 7 by switch 8, become by the operation (being connected operation) that the load 9... of specific region (facility) integral body is supplied with in electricity and the generating of each distributed power source 20 of purchasing from described commercial system 7.On the other hand, when commercial system 7 separates, become the operation (autonomous operation) of only supplying with the load 9... of specific region integral body at micro-grid system 1 by the generating of each power supply (2,3,4,5).
Below, the step of the micro-grid system 1 of constructing said structure is described.
(the character investigation of load change)
At first, when constructing micro-grid system 1, need the total capacity of decision distributed power source 20, so measure the step of the load change of specific region.
When explaining the step of measuring load change, at the load 9... that constructs predetermined position of micro-grid system 1 and the predetermined position that is subjected to electricity point P that is connected to commercial system 7 not shown power measurement device is set respectively, measures daily load fluctuation in the period of one by these measuring appliances.Then, determine the total capacity of distributed power source 20 based on the performance number after measuring.
Fig. 2 is the daily load curve of object lesson of the measurement result of expression daily load fluctuation.As shown in Figure 2, as the object lesson of daily load fluctuation, when the load power that is to the maximum about 600kW, it is made as the total capacity of distributed power source 20.
In addition, stable electric power when load-following operation when moving in order to realize connecting and autonomous operation is supplied with, need carry out the change compensation of distributed power source 20 for rapid load change, but need clear and definite " sharply " at this moment to be meant the time fluctuation of which kind of degree.Therefore, determine the step of the measuring period of load change.
When explaining the step of the measuring period that determines load change, distribute by the transition probability distribution of generation load variations amount and the transition probability of load changing rate, thus the measuring period of decision load change.Thus, can adopt necessary measuring period, so that carry out the load change compensation suitably.It is to have marked and drawed (plotted) probability distribution that how rate of change of measured value or measured value changes from a certain Measuring Time to Measuring Time next time that transition probability distributes, so can find out the change that can catch what degree by measuring period.
Fig. 3 is the figure of the generation method that distributes of the transition probability of expression load variations amount, and Fig. 4 is the figure of the generation method that distributes of the transition probability of expression load changing rate.
As shown in Figure 3, it is that the measured value (P[n]) of the front when having carried out with specified period measuring is as transverse axis that the transition probability of load variations amount distributes, with the curve of the measured value of back (P[n+1]), generate each measuring period by marking and drawing respectively from the measured value of measured value of the front of each measuring period (P[n]) and back (P[n+1]) as longitudinal axis gained.In addition, as shown in Figure 4, it is that the measurement variation rate (dP[n]) of the front when having carried out measuring with specified period is that the measurement variation rate (dP[n+1]) of transverse axis, back is the curve of longitudinal axis gained that the transition probability of load changing rate distributes, and generates each measuring period by marking and drawing respectively from the measurement variation rate of measurement variation rate of the front of each measuring period (dP[n]) and back (dP[n+1]).
Fig. 5 A～Fig. 6 B is that the transition probability of expression load variations amount distributes and the curve of the object lesson of the transition probability distribution of load changing rate, Fig. 5 A is that the transition probability of the load variations amount under the situation of having carried out measuring with 10 second cycle distributes, Fig. 5 B is that the transition probability of the load changing rate under the situation of having carried out measuring with 10 second cycle distributes, the transition probability of the load variations amount under the situation that Fig. 6 A carried out measuring with 1 second cycle distributes, and Fig. 6 B is that the transition probability of the load changing rate under the situation of having carried out measuring with 1 second cycle distributes.
Shown in Fig. 5 A, Fig. 5 B, when the cycle was carried out measurement with 10 second, the feature that the transition probability of load variations amount or load changing rate distributes is fuzzy and can not be by on top of, and shown in Fig. 6 A, Fig. 6 B, when the cycle was carried out measurement with 1 second, the character shape ground that the transition probability of load variations amount or load changing rate distributes manifested and is grasped clearly.Therefore, in the micro-grid system 1 in this object lesson, need compensate its change with 1 second period measurement load as can be known.
Then, carry out step that the above-mentioned load change of measuring is carried out frequency analysis.Specifically, will carry out frequency analysis by Fourier transform with the active power data that specified period is measured.Thus, the data of measuring are broken down into each frequency component.
Fig. 7 is the frequency analysis result's of expression load change the curve chart of object lesson.
As shown in Figure 7, owing to can confirm to include the fact of the load change of various frequency band, so need to select to be fit to the power supply (2,3,4,5) of the compensation of each frequency band as can be known.Have again, in this object lesson, owing to measuring, so in the frequency analysis result, have only than the slow fluctuation component of 0.5Hz (2 second cycle) to be decomposed with 1 second cycle.
(power source performance evaluation)
The power supply (2,3,4,5) that needs to know which type in above-mentioned frequency band has traceable response performance.Therefore, measure from each power supply (2,3,4,5) and accept output order, and estimate frequency response characteristic to the actual output response characteristic that arrives till its output.In order to estimate response performance, measure the sine-wave response characteristic that in each power supply (2,3,4,5) output order changes to hour from maximum.
Response characteristic when Fig. 8 A, Fig. 8 B represent command value sinusoidal wave shape ground is changed, the frequency situation identical that Fig. 8 A presentation directives value changes with the limit of response, the frequency that Fig. 8 B presentation directives value changes is the situation of the twice of the limit of response.
Shown in Fig. 8 A, Fig. 8 B, when increasing the frequency of sinusoidal wave command value, for instruction (Pref), output (Pout) can not be followed the tracks of.Its result, the sinusoidal wave amplitude of output (Pout) diminishes, and the phase difference variable between the sine wave of instruction (Pref) and the sine wave of output (Pout) is big.Therefore, for each power supply (2,3,4,5), the sinewave output value during according to the frequency change that makes instruction and the amplitude ratio of sinusoidal wave command value or sinewave output value when making the frequency change of instruction and the phase difference between the sinusoidal wave command value can be estimated the frequency response characteristic of each power supply (2,3,4,5).
As present embodiment, selection can be followed the tracks of the gas engine A (2) and the gas engine B (3) of change slowly, the Ni-MH battery 4 that can follow the tracks of change fast and double charge layer capacitor 5 as power supply.Sinewave output value when in this case, making the frequency change of instruction and the ratio of the amplitude of sinusoidal wave command value become the curve chart of Fig. 9 A.The curve chart that sinewave output value when in addition, making the frequency change of instruction and the phase difference between the sinusoidal wave command value become Fig. 9 B.
Shown in Fig. 9 A, Fig. 9 B, gas engine A (2) amplitude ratio (gain) till about 0.01Hz all is 0 (dB), and when surpassing about 0.01Hz, amplitude ratio (gain) decline.This means that if the scope till about 0.01Hz then gas engine A (2) can respond for instruction with adapting to.In addition,,, similarly till about 0.03Hz, can respond, in addition,, till about 0.1Hz, can respond for Ni-MH battery 4 for gas engine B (3) according to the curve chart of Fig. 9 A, Fig. 9 B, and, for double charge layer capacitor 5, more than 0.1Hz, also can respond.
Then, based on the frequency response characteristic of each power supply after the above-mentioned evaluation (2,3,4,5), determine the frequency of sharing of each power supply (2,3,4,5) respectively.Specifically, make gas engine A (2) undertake the frequency lower, make the frequency till gas engine B (3) undertakes 0.01～0.03Hz, make Ni-MH battery 4 undertake the frequency of 0.03～0.10Hz, make double charge layer capacitor 5 undertake the frequency higher than 0.1Hz than 0.01Hz.
In addition, whole load change of sharing frequency band that each power supply (2,3,4,5) needs compensation to undertake separately, but the capacity of each power supply (2,3,4,5) can not compensate whole load change that it shares frequency when too small.On the other hand, when the capacity of each power supply (2,3,4,5) is excessive, become the redundant equipment of power supply, become uneconomical.Therefore, based on the sharing frequency of above-mentioned each power supply (2,3,4,5) and the frequency analysis result of load change is distributed to each power supply (2,3,4,5), thereby ask the only capacity of each power supply (2,3,4,5) respectively.Specifically, by the intensity of sharing frequency band of each power supply (2,3,4,5) is carried out integration, calculate the only capacity of this power supply.
Figure 10 is the curve chart of the frequency analysis of the load change undertaken of the Ni-MH battery 4 of expression in the above-mentioned example.
When being example, as shown in figure 10, can carry out integration, calculate the only capacity of Ni-MH battery 4 by the intensity of sharing frequency band that Ni-MH battery 4 is undertaken with Ni-MH battery 4.
, for the load change of long time period, expectation has similarly been considered the output decision of economy with commercial system, but can be considerably less with the power supply of certain output operation in the less micro-grid system 1 of the population parameter of power supply.Therefore, for the gas engine A (2), the gas engine B (3) that use fuel, generating efficiency during the generating efficiency during steady operation and transition operation and estimate the combustion expense characteristic of gas engine A (2), gas engine B (3), and determine the utilization of described gas engine A (2), gas engine B (3) based on this evaluation result.Reach under certain state generating efficiency when calculating steady operation in the output that makes each power supply (2,3,4,5) according to energy output and consume fuel amount.Generating efficiency when on the other hand, energy output when providing the sinewave output instruction to each frequency with peak swing and consume fuel amount are calculated the transition operation.
The curve chart of the generating efficiency the when curve chart of the generating efficiency when Figure 11 A is the expression steady operation, Figure 11 B are expression transition operation.
Shown in Figure 11 A, the gas engine A (2) during steady operation, gas engine B (3), high output can be generated electricity with high efficiency more.The generating efficiency of gas engine A (2), gas engine B (3) when on the other hand, transition moves does not as can be known rely on the speed that output changes.This generating efficiency of having represented gas engine A (2), gas engine B (3) only depends on the fact of average output.Therefore, it is also no problem that output is changed when operation continually, can use gas engine A (2), gas engine B (3), to guarantee high fifty-fifty output.
, be under the situation of generator of whirler formula at least one of above-mentioned power supply, when autonomous operation,, on system frequency, produce change because the rotary speed of this generator changes according to load change.The electric power of purchasing that is subjected to the electricity point when being replaced into the connection operation by change with this generator, the credit rating of the system frequency when autonomous operation is judged in the control of the load-following operation control when moving according to connection.Thus, can simultaneously connect the quality that the operation one side is estimated the system frequency when transferring to autonomous operation.
Specifically, the output that changes the generator when making the slope operation is changed to time till the maximum output from minimum output, estimates the relation of the change between power variation rate and the system frequency.Thus, make size become clear and definite for the output change of the generator that system frequency is suppressed at time per unit required in a certain mobility scale.The output order to generator when in addition, evaluation moves for sine wave changes from the system frequency that maximum changes to minimum sine-wave response.Thus, obtain the LOAD FREQUENCY response performance.
Figure 12 A is the curve chart of the system frequency change of expression when having carried out the slope operation by gas engine A (2), and Figure 12 B is the curve chart of the system frequency change of expression when having carried out sinusoidal wave operation by gas engine A (2).
Shown in Figure 12 A, if the system frequency deviation when setting autonomous operation then determines in order to be converged in the scope of allowing rate of change of generator output required in this deviation.Therefore, according to the control precision of purchasing the certain operation of electric power that makes when connecting operation, the precision of the control of the generator output in the time of change can being suppressed autonomous operation is as the standard of measuring.In addition, shown in Figure 12 B, distinguish the required frequency band of system frequency deviation that sets in order to converge to.Therefore, in fact when carrying out autonomous operation, generator output Be Controlled is to carry out Steam Generator in Load Follow at above-mentioned frequency band.
Figure 13 is the schematic diagram of the system of expression when carrying out the evaluation of system frequency grade.
When autonomous operation,,, need carry out evaluation for the system frequency change of load change for the generator of whirler formula for the power quality that makes system keeps certain.But, in the actual load of computer etc. if not high-quality electric power then causes fault, so in fact be difficult to test with actual load.Therefore, as shown in figure 13, pseudo-load 10 is connected to distributed power source 20, constructs the autonomous system of simulation.Then, simulate various load change situations, and confirm the response for change of distributed power source 20 by controlling described pseudo-load 10.
The construction method of the micro-grid system of forming according to above-mentioned steps, measure the load change of specific region and carry out the step of this measurement data being carried out frequency analysis, the load change of the various speed of the load change from very slow load change to moment overlaps the load change of the specific region that constitutes, and is broken down into each frequency component and is grasped.In addition, based on the frequency response characteristic separately of each power supply (2,3,4,5) and determine the frequency of sharing that each power supply (2,3,4,5) undertakes respectively, and share frequency based on this and the frequency analysis result of load change is distributed to each power supply (2,3,4,5), ask the step of the capacity of each power supply (2,3,4,5), so each power supply (2,3,4,5) is undertaken suitable separately frequency band respectively.And, by said frequencies analysis result and share frequency, calculate the capacity of each power supply (2,3,4,5) respectively, so each power supply (2,3,4,5) is suitable capacity.So, construct micro-grid system 1 based on the response performance of the speed of load change and each power supply (2,3,4,5), can suitably catch the load change of object by way of compensation and carry out the compensation of high efficiency load change, and can prevent the off-capacity or the redundant equipment of power supply (2,3,4,5).So, from the selection of power supply (2,3,4,5) and the decision stage of formation, just consider on the performance of each power supply (2,3,4,5), to realize balanced operation, so can make the generating of micro-grid system 1 and the balance unanimity between the load.Thus, can make micro-grid system 1 autonomous operation, and when connecting operation, carry out Steam Generator in Load Follow.
In addition, distribute by the transition probability distribution of generation load variations amount and the transition probability of load changing rate, the measuring period of decision load change is so can make the time interval of the change that changes the object that compensates clear and definite.
In addition, for the gas engine A (2), the gas engine B (3) that use fuel, generating efficiency during the generating efficiency during based on steady operation and transition operation and estimate combustion expense characteristic, and determine the utilization of described gas engine A (2), gas engine B (3) based on this evaluation result, so can will use gas engine A (2), the gas engine B (3) of fuel to turn round expeditiously, can reduce the combustion expense of gas engine A (2), gas engine B (3), and the utilization of the micro-grid system 1 of economy has been considered in realization.
In addition, the distributed power source of forming for the generator of whirler formula 20, carry out evaluation for the system frequency change of load change, and determine the scope of the output valve of generator based on this evaluation result, so when autonomous operation, the change of system frequency can be converged in the deviation of regulation, can guarantee the power quality of expecting.
And, on the distributed power source 20 that generator is formed, connect the pseudo-load 10 of checking usefulness and construct the virtual system of simulation, use this virtual system to carry out evaluation, actual load is broken down so can carry out other evaluation of system frequency level for the change of the system frequency of load change.
More than, the execution mode of the construction method of micro-grid system of the present invention has been described, but the present invention is not limited to above-mentioned execution mode, can suitably change in the scope that does not break away from its aim.For example, in the above-described embodiment, the transition probability distribution of applied load variable quantity and the transition probability of load changing rate distribute and decide the measuring period of load change, but the present invention also only the transition probability of applied load variable quantity distribute and to decide the measuring period of load change, or only the transition probability of applied load rate of change distributes and decides the measuring period of load change.And, the present invention can the setting measurement cycle and not the transition probability of applied load variable quantity distribute or the transition probability of load changing rate distributes.For example, can preestablish measuring period, perhaps, also can carry out the continuous measurement of load change.
In addition, in the above-described embodiment, for the gas engine A (2), the gas engine B (3) that use fuel, generating efficiency during the generating efficiency during based on steady operation and transition operation and estimate combustion expense characteristic, and determine the utilization of described gas engine A (2), gas engine B (3) based on this evaluation result, but the evaluation of the combustion expense characteristic of the generating efficiency when generating efficiency when the present invention also can not merge steady operation and transition operation, and the power supply of fuel is used in utilization.For example, the generating efficiency in the time of can only considering steady operation and estimate combustion expense characteristic, perhaps, the generating efficiency when only considering the transition operation and estimate combustion expense characteristic, and, can not consider that also combustion takes employs power idiocratically.
In addition, in the above-described embodiment, the distributed power source of forming for the generator of whirler formula 20, carry out evaluation for the system frequency change of load change, determine the scope of the output valve of this generator based on this evaluation result, but the present invention also can not carry out the evaluation of concerned power generation machine for the system frequency change of load change, and the scope of the output valve of decision generator.For example, can be predetermined the scope of the output valve that is set, perhaps, also can not determine the scope of the output valve of generator.
In addition, in the above-described embodiment, on generator, connect the pseudo-load 10 of checking usefulness and construct the virtual system of simulation, and use this virtual system to carry out evaluation for the change of the system frequency of load change,, the present invention carries out evaluation but also can not constructing pseudo-load for the system frequency change of load change.For example, even under the also trouble-proof situation of the lower electric power of actual load quality, also can not construct pseudo-load and use actual load and real system to carry out evaluation for the change of the system frequency of load change.
In addition, in the above-described embodiment, a certain facility is constructed micro-grid system 1 as the specific region in this facility situation has been described, but the invention is not restricted to the situation of in a facility, constructing micro-grid system, for example, also concentrated zones such as a plurality of dwelling houses can be constructed micro-grid system as the specific region in this zone.
In addition, in the above-described embodiment, select gas engine A (2), gas engine B (3) and Ni-MH battery 4, double charge layer capacitor 5 as power supply, but power supply of the present invention is not limited to above-mentioned power supply, the kind of power supply can suitably change.For example, can select the fuel cell or the gas turbine (gas turbine) of certain output in principle, perhaps, also can select the secondary cell (electric power storing device) of NAS battery beyond the Ni-MH battery or lead accumulator etc., and, can select to follow the tracks of the electric power storing facility of the superconducting power storage system etc. of very fast change.In addition, the platform number in the unqualified above-mentioned execution mode of power supply of the present invention, for the platform number of power supply, if many, then suitably change.
In addition, in the scope that does not break away from purport of the present invention, can be suitably the inscape of above-mentioned execution mode be replaced into known inscape, in addition, also can the above-mentioned variation of appropriate combination.
The application require based on September 8th, 2006 spy in Japanese publication be willing to the 2006-244272 priority, with its content quotation in this.
Industrial applicibility
According to the present invention, because the measurement data of load change is by frequency analysis, so from very slow bearing Lotus changes to the load change of various speed of the load change of moment and overlaps the specific region that consists of Load change is broken down into each frequency component and is grasped. In addition, in the power supply of multiple types, has each From different Steam Generator in Load Follow characteristics (response characteristic), but based on separately frequency response characteristic and determine each Power supply is undertaken respectively shares frequency. Then, share frequency based on this and the frequency analysis result (is decomposed After each frequency component) be assigned to each power supply, so that each power supply is undertaken respectively is separately suitable Frequency band. And, by said frequencies analysis result and share frequency, calculate respectively the capacity of each power supply, So distributed power source becomes suitable capacity.
Claims (5)
1. the construction method of a micro-grid system is used to construct the distributed power source that comprises multiple class power supply is controlled the network of utilization uniformly and, be it is characterized in that this method comprises to the specific region supply capability:
Measure the load change of described specific region, thereby the measurement data of described load change is carried out the step of frequency analysis; And
Based on the frequency response characteristic separately of described multiple class power supply and determine the frequency of sharing that each power supply of described multiple class power supply undertakes respectively, and share frequency and the frequency analysis result of load change is distributed to each power supply of described multiple class power supply based on described, in the hope of step to the capacity of each power requirement of described multiple class power supply.
2. the construction method of micro-grid system as claimed in claim 1 is characterized in that,
Distribute and at least one side of the transition probability distribution of load changing rate by the transition probability that generates the load variations amount, determine the measuring period of described load change.
3. the construction method of micro-grid system as claimed in claim 1 or 2 is characterized in that,
For fuel consumption formula power supply, the generating efficiency the during generating efficiency during based on steady operation and transition operation and estimate the combustion expense characteristic of described fuel consumption formula power supply, and determine the utilization of described fuel consumption formula power supply based on this evaluation result.
4. the construction method of micro-grid system as claimed in claim 1 is characterized in that,
For rotary generator formula power supply, carry out evaluation to the system frequency change of load change, determine the scope of the output valve of described rotary generator formula power supply based on this evaluation result.
5. the construction method of micro-grid system as claimed in claim 4 is characterized in that,
On described rotary generator formula power supply, connect to check the pseudo-load of usefulness and construct the virtual system of simulation, and use described virtual system to carry out evaluation the system frequency change of described load change.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006244272A JP4895735B2 (en) | 2006-09-08 | 2006-09-08 | How to build a microgrid system |
| JP244272/2006 | 2006-09-08 | ||
| PCT/JP2007/067316 WO2008029849A1 (en) | 2006-09-08 | 2007-09-05 | Microgrid system building method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101512866A true CN101512866A (en) | 2009-08-19 |
| CN101512866B CN101512866B (en) | 2012-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007800329430A Expired - Fee Related CN101512866B (en) | 2006-09-08 | 2007-09-05 | Micro-grid system construction method |
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| Country | Link |
|---|---|
| JP (1) | JP4895735B2 (en) |
| CN (1) | CN101512866B (en) |
| WO (1) | WO2008029849A1 (en) |
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| CN102800032A (en) * | 2012-07-13 | 2012-11-28 | 中国电力科学研究院 | Cost benefit analysis method of renewable energy source distributed generation operation mode |
| CN102799952A (en) * | 2012-07-13 | 2012-11-28 | 中国电力科学研究院 | Optimization method of renewable energy source distribution type power generation operation mode |
| CN106340903A (en) * | 2015-07-06 | 2017-01-18 | 卡特彼勒公司 | Load Distribution for Dissimilar Generator Sets |
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- 2007-09-05 CN CN2007800329430A patent/CN101512866B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102800032A (en) * | 2012-07-13 | 2012-11-28 | 中国电力科学研究院 | Cost benefit analysis method of renewable energy source distributed generation operation mode |
| CN102799952A (en) * | 2012-07-13 | 2012-11-28 | 中国电力科学研究院 | Optimization method of renewable energy source distribution type power generation operation mode |
| CN106340903A (en) * | 2015-07-06 | 2017-01-18 | 卡特彼勒公司 | Load Distribution for Dissimilar Generator Sets |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2008067544A (en) | 2008-03-21 |
| WO2008029849A1 (en) | 2008-03-13 |
| JP4895735B2 (en) | 2012-03-14 |
| CN101512866B (en) | 2012-06-27 |
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