CN108808699A - A kind of dual quadrant frequency-response analysis method suitable for bidirectional energy-storage equipment - Google Patents
A kind of dual quadrant frequency-response analysis method suitable for bidirectional energy-storage equipment Download PDFInfo
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Abstract
Amphicheirality, universality and the diversity demand for adjusting analysis method to frequency for current power system, propose dual quadrant frequency characteristic (DQFC) analysis method suitable for bidirectional energy-storage equipment.DQFC analysis methods construct unified power reference system, provide that from the direction of power grid absorbed power be just with Motor convention, the direction that power is sent out to power grid is negative, " lotus ", " source " in system are presented on the first and second quadrant respectively, solve the problems, such as reference value existing for legacy frequencies specificity analysis method；DQFC analysis methods can be suitable for complicated multi-power system frequency modulation Analysis on Mechanism (primary frequency modulation and frequency modulation frequency modulation).The multi-power system can be combined by bidirectional energy-storage equipment, infinite bulk power grid, actual electric network and the generating set run under various control strategy；DQFC analysis methods have carried out dimension expansion to legacy frequencies method, and it is to run line to indicate power-balance state to change operating point.Frequency characteristic qualitative and quantitative analysis can be carried out to the bidirectional energy-storage equipment that double mode is run, solve the problems, such as single dimension existing for legacy frequencies specificity analysis method.Under the increasing trend of new energy permeability, the bidirectional energy-storage number of devices in power grid will be more and more.In this background, method proposed by the invention has more wide application space.
Description
Technical field
The invention belongs to field of new energy technologies, more particularly to a kind of dual quadrant frequency characteristic suitable for bidirectional energy-storage equipment
(DQFC) analysis method.Specifically about distributed generation resource, micro-capacitance sensor, renewable energy power generation, the systems such as energy storage it is novel
Frequency-response analysis method.
Background technology
Micro-capacitance sensor improves power supply reliability and power quality, avoids distributed generation resource by the flexible control to micro battery
Individually power supply causes to impact to electric network security, stability and power quality etc..
To solve energy crisis and environmental problem, more and more regenerative resources, electric vehicle and energy-storage system need
Micro-capacitance sensor is accessed by converters.The broad sense energy storage devices such as accumulator, electric vehicle, hair-storage association system can
According to the demand of power grid, energy in bidirectional flow is realized, herein simply referred to as bidirectional energy-storage equipment.It is double when grid power abundance
It is operated in rectification mode to the current transformer of energy storage device interface, by energy storage；And when load electricity consumption is excessive or power grid
Suddenly when power-off, current transformer is run with inverter mode, and the electric energy of storage is reverse into alternating current, feed-in power grid or directly to weight
Want load supplying.There is scholar to propose the concept of autonomous electric system, provides unified interface mechanism for intelligent grid access, make new
The energy can participate in mains frequency with load as normal power supplies and adjust.To bidirectional energy-storage equipment, more stringent requirements are proposed for this,
The adjusting of mains frequency can be independently participated under hair, storage both of which.
In order to successfully manage the fast development of above-mentioned bidirectional energy-storage equipment, makes and be more in line with the following power grid demand
" model load " has part document and is studied above-mentioned bidirectional energy-storage equipment.It can be divided into two classes according to application scenarios：
Traditional energy storage scene and electric vehicle scene.First, under traditional energy storage scene, the control mode and pattern of bidirectional converter are cut
The method of changing has obtained certain research.There is scholar to describe a kind of double mode operation controlling party suitable for special bidirectional converter
Case.Some scholars realize the charging/discharging function of energy-storage system with different control strategies.In addition, in the fields V2G of electric vehicle
Under scape, many scholars study the topological structure of bidirectional converter and corresponding control strategy.Although having part document
Studied for bidirectional energy-storage equipment, but under practical micro-capacitance sensor environment, the frequency modulation characteristic of bidirectional energy-storage equipment and point
Analysis method also rarely has research.If can be on the basis of practical micro-capacitance sensor characteristic, by bidirectional energy-storage equipment in different mode (generator
Pattern/electric motor mode), the frequency regulation mechanism under different control strategy carry out analyzing in detail, electric vehicle, storage can be promoted
The development of the bidirectional energy-storages equipment such as energy, it is steady to the structure and maintenance mains frequency in the following high permeability environment of autonomous electric system
It establishes a capital and has a very important significance.
Invention content
The purpose of the present invention is to propose to a kind of dual quadrant frequency-response analysis methods suitable for bidirectional energy-storage equipment.With solution
Certainly new scene issues/stores up the frequency adjusting problem analysis of bidirectional energy-storage equipment.
The characteristic of bidirectional energy-storage equipment is mainly determined by the control mode of its interface current transformer：Common control method has
Three kinds of control that work(is idle (PQ), electric voltage frequency (Vf) control and droop control.Which kind of control strategy prime mover is depended on using
The operational mode of type and micro-capacitance sensor.PQ controls make the distribution source of declining export constant schedule power, by power outer shroud and electric current
Inner ring is constituted, and is widely used in gird-connected inverter and energy storage inverter.Current transformer under PQ controls is as in electric system
PQ nodes.PQ nodes account for most of in micro-grid system, common energy storage devices, electric vehicle is generally PQ nodes.Vf is controlled
System can export constant voltage and frequency, be generally made of outer voltage and current inner loop, be widely used in islet operation shape
Master & slave control structure microgrid under state.When piconet island is run, main control unit is controlled using Vf, is from control as balance nodes
Unit provides voltage and frequency support.The hair storage association system (light storage, wind storage, wind-light storage etc.) of distributed generation resource and energy storage cooperation
Because of its superior response speed and schedulability, Vf controls can be used.Droop control is to imitate synchronous generator operation characteristic pair
The method that distributed generation resource is controlled is usually used in the parallel system of reciprocity control structure microgrid, have droop control and it is anti-under
Point of vertical control.Droop control can be carried out to frequency using the distributed generation resource of droop control.It should be noted that droop control
Subring section can be used as to be applied in PQ controls and Vf controls.
The principle of electric system primary frequency modulation is shown：In frequency-modulating process, for single device, the load undertaken and its
Difference coefficient is inversely proportional.The Primary frequency control ability of micro-capacitance sensor is the sum of the fm capacity of each frequency modulation equipment in micro-capacitance sensor.Analysis electricity
Common frequency-response analysis is shown in Fig. 1 when the relationship of frequency and active power in Force system.Use analysis method energy shown in FIG. 1
Meet the frequency-response analysis requirement of conventional electric generators and load.But in the background that bidirectional energy-storage equipment permeability is gradually increased
Under, still expose certain defect.It is embodied in
Reference value problem：The active power reference direction of load is the just active power reference of generator with absorbed power
Direction is that just, there are certain cognition difficulty, when analysis may cause unnecessary misunderstanding to send out active power.
Single supply problem：Conventional method is commonly used to analysis single supply and stands alone as load power supply (or to be equivalent to all power supplys
One equivalent power supply) when frequency characteristic, it is difficult to analyze the power supplys of different difference coefficients jointly and be the frequency modulation characteristic of load power supply.
Single dimension problem：Conventional method can only indicate the frequency modulation characteristic of generator hair power under single dimension, and for having
The bidirectional energy-storage equipment of two dimensions of generator mode and electric motor mode, it is difficult to carry out frequency modulation analysis.
In view of the above-mentioned problems, a kind of dual quadrant frequency-response analysis method suitable for bidirectional energy-storage equipment is suggested,
Schematic diagram is shown in Fig. 2.Abscissa is active power axis, and ordinate is frequency axis, and the equipment of absorbed power is located at frequency axis right side (the
One quadrant), the equipment for sending out power is located on the left of frequency axis (the second quadrant).Run the static state of line and each absorbed power equipment
The intersection point abscissa of frequency characteristic line is the power that the equipment absorbs；Operation line and the static frequency for each sending out power apparatus are special
Property line intersection point abscissa be the power that sends out of the equipment.All intersection point abscissas of the equipment of absorbed power, which are added up to this, is
The power that all electrical equipments absorb in system；All intersection point abscissas for the equipment for sending out power are added up in the system and are owned
The power that generating equipment is sent out.The equilibrium of supply and demand of electric power requires said two devices equal in electric system, this in Fig. 2 by running line
Move up and down to realize.
The DQFC analytical figures of single supply system are shown in Fig. 3.
Horizontal axis is active power axis in Fig. 3, and the longitudinal axis is frequency axis.Load absorption power, therefore its frequency characteristic is located at first
Quadrant, corresponding performance number are just.Power supply sends out power, therefore its frequency characteristic is located at the second quadrant, and corresponding performance number is negative.
Fig. 3 cathetus LGAnd LL0The respectively frequency characteristic of the initial equilibrium state of the frequency characteristic and total load of generating equipment.Straight line o with it is vertical
Axis, LGAnd LL0Intersection point be respectively point x, a and b, have ax=bx, i.e. PG0=PL0, meet power-balance relationship.Therefore, initial shape
Under state, the operation line of system is straight line o.Coordinate at point x is fN, system is in rated frequency fNLower operation.Total load increases Δ
PL0Afterwards, the frequency characteristic of load will move right and become straight line LL1, in the case, if system still maintains rated frequency
Constant, then the power of load absorption will be by PL0Increase to PL0+ΔPL0, that is, straight line LL1On c points (correspond to Fig. 1 in
A points).But in fact, since load increase destroys original power-balance, under the fm role of generating equipment and load,
Frequency will settle to new equilibrium valve f1, operation line is the straight line o ' in Fig. 2, has dy=ey, that is, reaches PG1=PL1New power
Balance.
The actual process of the above process is as follows：After total load increase, originally due to the inertia of generating set, rotating speed cannot
The power that suddenly change, system frequency and system are sent out temporarily remains unchanged, and the output power of generating set is made to be less than load
Power causes the vacancy of energy.This vacancy can only be discharged the kinetic energy of storage by generating set, and then, generating unit speed starts
It reduces.Then, since rotary speed of generator group reduces, under the action of governing system, intake valve and water inlet valve opening increase, and original is dynamic
The mechanical output of machine increases, and then the output power of generator is consequently increased.Meanwhile the load in electric system is with frequency
Variation be adjusted according to the frequency modulation characteristic of itself, it is however generally that sudden load increase cause frequency decline after, load can be reduced
The power of absorption.With the progress of the two processes, system will reach new balance.It can be seen that the above process and the analysis sides DQFC
The analysis result of method matches.
Next application of the DQFC analysis methods in multi-power system is introduced, which includes not only common hair
Motor group can also include bidirectional energy-storage equipment, actual electric network etc..It is directed to different multi-power system composition difference separately below
Introduce analysis method.
Fig. 4 is shown in application of the DQFC analysis methods in the multi-power system containing generating set.For generating set, point
The single supply system DQFC analyses of analysis as shown in figure 3 are similar.Difference lies in due to there is multiple power supplys, have more on the left of frequency axis
The frequency characteristic of a power supply.It is illustrated by taking the different generating set of two frequency characteristics as an example below, sees Fig. 4.Straight line LG1With
LG2The respectively frequency characteristic of generating set 1 and generating set 2, subscript 0 indicates initial steady state, steady after the expression frequency modulation of subscript 1
State.
Application of the DQFC analysis methods in the multi-power system containing bidirectional energy-storage equipment.Bidirectional energy-storage equipment operates in
When generator mode, frequency characteristic is in the left side of frequency axis；When operating in electric motor mode, frequency characteristic is on the right side of frequency axis
Side.Since its difference coefficient is generally constant, when switching between modes, it is only necessary to translate frequency characteristic or so, slope
It remains unchanged.Other analysis methods are consistent with the analysis of Fig. 4 generating sets
Application of the DQFC analysis methods in the multi-power system containing actual electric network.Infinite bulk power grid is Utopian mould
The frequency of type, actual electric network can have small variation with variation of contributing.In distributed micro-capacitance sensor, actual electric network model is just particularly
It is necessary.The frequency characteristic of actual electric network is the straight line of a slope very little between infinite bulk power grid and generating equipment, they
Between relationship see Fig. 5.Straight line LG、LG′、LG *、LLRespectively infinite bulk power grid, actual electric network, generating equipment, the frequency of load
Characteristic.
Description of the drawings
Fig. 1 legacy frequencies characteristic analysis methods.
Fig. 2 is suitable for the dual quadrant frequency-response analysis method of bidirectional energy-storage equipment.
The DQFC analysis methods of Fig. 3 single supply systems.
Application of Fig. 4 DQFC analysis methods in the multi-power system containing generating set.
The frequency characteristic of Fig. 5 different electrical powers compares.
Fig. 6 includes the multi-power system DQFC analyses of generator mode bidirectional energy-storage equipment.
Fig. 7 includes the multi-power system DQFC analyses of electric motor mode bidirectional energy-storage equipment
Specific implementation mode
The similarities and differences of institute's extracting method and conventional method to illustrate the invention briefly describe the tune of unit primary frequency modulation first
Save principle.Electric system normal running (operation) conditions lower frequency deviation is ± 0.2Hz.In order to ensure frequency quality, should meet first
Under rated power in system active power balance
In formula, PGi--- the active power that generating equipment i (i=1,2 ..., m) is sent out；M --- generating equipment in system
Quantity；PLj--- the active power that electrical equipment j (j=1,2 ..., n) absorbs；N --- the quantity of electrical equipment in system.It needs
It is noted that generating equipment herein refers not only to conventional power source, further include the bidirectional energy-storage equipment run with generator mode；
Electrical equipment refers not only to traditional load, further includes the bidirectional energy-storage equipment run with electric motor mode.When network load changes,
Frequency fluctuates, the generating equipment shared power shortage with fm capacity being incorporated into the power networks, and frequency modulation is participated in, to make
System reaches new power-balance, in a certain range by the variation limitation of mains frequency.Each generating equipment adjusts frequency
" participation " determined by difference coefficient σ.
In formula, KG *--- the perunit unit power regulation being worth on the basis of specified unit power regulation；KG--- unit tune
Save power；KGN--- specified unit power regulation；ΔPG--- active power variable quantity；Δ f --- frequency variation；PGN——
Rated active power；fN--- rated frequency.The unit power regulation mark of generator is sent out with the height generating equipment of frequency
Go out the number that power decreases or increases.
When having more parallel running of generators in system, the frequency of i-th generating equipment adjusts equation and is
The variable quantity of frequency is identical in whole system when stable state, is summed to formula (6)
According to the format of formula (6), it is a generating equipment by all generating equipment equivalences, then has
As the above analysis, summarize in frequency-modulating process, for single device, the load that undertakes and its difference coefficient at
Inverse ratio.The Primary frequency control ability of micro-capacitance sensor is the sum of the fm capacity of each frequency modulation equipment in micro-capacitance sensor.
In the frequency regulation characteristics in analyzing electric system, generally use analysis method shown in FIG. 1.This method energy
Enough meet traditional analysis requirement, with the hair of micro-capacitance sensor and new energy, bidirectional energy-storage equipment (energy-accumulating power station, electric vehicle etc.)
Exhibition, this method show three kinds of drawbacks：Reference value problem, single supply problem and single dimension problem.
First, for reference value problem, unified power reference direction is established.In view of cognition is accustomed to, using motor
Convention carrys out regulation positive direction.No matter for generating equipment or electrical equipment, with from the direction of power grid absorbed power be just, with to
The direction that power grid sends out power is negative.Clearly generating equipment and electricity consumption can be set under unified power reference direction in this way
It is standby to be distinguished, and their specific physical significances are assigned, unnecessary misunderstanding will not be generated because reference direction is inconsistent.So
Afterwards, for single supply problem and single dimension problem, conventional method is subjected to dimension expansion, it is made to be not only applicable to single tradition hair
Motor, and it is suitable for bidirectional energy-storage equipment, even more than the complicated micro-capacitance sensor of power supply.Conventional method in Fig. 1 is only first
Frequency characteristic is indicated in quadrant, the power-balance state shown in operating point (midpoints Fig. 1 o and point o ') expression (1).New method
Frequency characteristic is indicated in first quartile and the second quadrant, is used in combination operation line to indicate equilibrium state, can solved list in this way
While dimensional problem, the convenient process that more power supplys (wherein including bidirectional energy-storage equipment) are participated in frequency modulation is analyzed.Using
Above-mentioned basic ideas propose that DQFC analysis methods, fundamental diagram are shown in Fig. 2, and Fig. 3 is shown in the application in the case of single supply.
The reasonability of DQFC analysis methods is derived from mathematical relationship below.In Fig. 1, total load increases Δ PL0, load because
The power Δ P that itself adjustment effect absorbs lessLThe power Δ P issued additional by the adjustment effect of itself with generating equipmentGBetween meet formula
(9) " fundamental relation one " shown in.It is to realize two initial equilibrium state, last current state work(which characterizes " participants " of frequency-modulating process
The inevitable outcome of rate balance.
ΔPL0=Δ PL+ΔPG (9)
In addition, Δ PL、ΔPGMeet between Δ f " fundamental relation two " shown in formula (10).Which characterizes frequency-modulating process
" participants " specifically carry out frequency modulation with which kind of " participation ".
In formula, kL--- the ratio of frequency variation and power variation on straight line L.Formula (9) and formula (10) are represented
Two fundamental relations be frequency-modulating process essence.
Whether verification DQFC analysis methods meet above-mentioned fundamental relation below.
In Fig. 2, obtained by the corresponding just equilibrium state of operation line o
PG0=PL0 (11)
It is obtained by the corresponding last equilibrium state of operation line o '
PG1=PL1 (12)
Mathematical analysis is carried out to the transient process of operation line o to operation line o ', for generating equipment, the power sent out increases
Add, has
PG0+ΔPG=PG1 (13)
For load, first increase, afterwards because itself adjustment effect reduces, has
PL0+ΔPL0-ΔPL=PL1 (14)
Simultaneous formula (11)~(14) can obtain " fundamental relation one " shown in formula (9), be easy to get formula by the mathematical relationship in Fig. 2
(10) " fundamental relation two " shown in, further relates to DQFC analysis methods and meets frequency modulation fundamental relation, without prejudice to work(frequency rule, tool
There is feasibility.The above-mentioned DQFC analysis methods for single supply system.It is compared by above-mentioned deriving analysis and with conventional method, it is seen that
DQFC analysis methods solve the problems, such as the reference value of traditional analysis on the basis of realizing the function of traditional analysis, and
More easy-to-understand compared with the latter, physical significance is definitely.
The DQFC analysis methods of multi-power system are described below.Generating set, double may be contained in this kind of multi-power system
To energy storage device and actual electric network etc..
For the multi-power system containing generator, in Fig. 4, obtained by the corresponding just equilibrium state of operation line o
PG10+PG20=PL0 (15)
It is obtained by the corresponding last equilibrium state of operation line o '
PG11+PG21=PL1 (16)
Have for generating set 1 and generating set 2 to the transient process of operation line o to operation line o '
For load, the case where frequency characteristic is with single supply, is identical, sees formula (14).
Simultaneous formula (14)~(17) can obtain formula (18)
ΔPL0=Δ PL+(ΔPG1+ΔPG2) (18)
Meet " fundamental relation one " shown in formula (9).
It is easy to get by the mathematical relationship of Fig. 4
Meet " fundamental relation two " shown in formula (10).
When load reduces suddenly, the frequency-modulating process of system is the inverse process of the above process, and above-mentioned analysis stands good.
Formula (18) is extended into n platform units and participates in frequency modulation, is obtained
Formula (19) is expanded to n platform units and participates in frequency modulation, is had
For the multi-power system containing bidirectional energy-storage equipment：When bidirectional energy-storage equipment operates in generator mode, frequency
Characteristic is in the left side of frequency axis；When operating in electric motor mode, frequency characteristic is on the right side of frequency axis.Due to its difference coefficient one
As it is constant, therefore when switching between modes, it is only necessary to translate frequency characteristic or so, slope remains unchanged.Other analysis sides
Method is consistent with the analysis of Fig. 3, and two fundamental relations of formula (20) and formula (21) are still met under more units.
For the multi-power system containing power grid：Infinite bulk power grid is Utopian model, and the frequency of actual electric network can be with
Variation of contributing has small variation.In distributed micro-capacitance sensor, actual electric network model is just particularly necessary.The frequency of actual electric network is special
Property is the straight line of a slope very little, the relationship between them is shown in Fig. 5 between infinite bulk power grid and generating equipment.
Multi-power system DQFC analysis examples：
The above solves the problems, such as the reference value of traditional analysis and single supply problem using DQFC analysis methods.
Single dimension problem is related to the analysis to bidirectional energy-storage equipment, next will be with DQFC analysis methods to containing bidirectional energy-storage equipment
Multi-power system carry out instance analysis, pass through example present single dimension way to solve the problem.
In view of the actual characteristic of micro-capacitance sensor, research is participated in micro- electricity of frequency modulation by bidirectional energy-storage equipment and actual electric network jointly
Net system.Under generator mode, electric motor mode, study respectively under the bidirectional energy-storage equipment and droop control under PQ controls
The frequency modulation characteristic of bidirectional energy-storage equipment.For ease of analyzing and read, ignore the frequency modulation characteristic of load, and by the slope of actual electric network
It is appropriate to increase.
The multi-power system DQFC analysis examples that the bidirectional energy-storage equipment of generator mode droop control participates in are shown in Fig. 6.Under
The analysis of frequency-modulating process next time of vertical control strategy and the analysis of Fig. 4 are similar, finally, total in bidirectional energy-storage equipment and actual electric network
With under adjustment effect, system frequency is by fNDrop to f1It is easy to get
ΔPL0=Δ PG *+ΔPG′ (22)
If system frequency is unsatisfactory for requiring after primary frequency modulation, frequency modulation frequency modulation need to be carried out.For ease of analysis, to realize indifference tune
Illustrate the process for section.As shown in figure 5, the frequency f after primary frequency modulation1On the basis of, the effect of frequency modulation frequency modulation be make it is two-way
Energy storage device issues additional power Δ PG-2 *, so that its frequency characteristic is moved to right, lead to PG1 *+ΔPG-2 *+PG1' > PL1.Generated output is more than negative
The conversion of extra electric energy is stored in shaft by lotus power, unit, so that rotating speed is increased, system frequency is gradually increasing.Therefore, in figure
Run line f=f1It will move up.Work as PG0 *+ΔPG-2 *+PG0'=PL1When, reach power-balance, operation line at this time returns to, and system is real
Existing non differential regulation.
The bidirectional energy-storage equipment of generator mode PQ controls is discussed below.As shown in fig. 6, information when being controlled using PQ is used
Runic indicates.If the active reference value of bidirectional energy-storage system is PG0 *, LG-PQ *For its frequency characteristic.It is two-way under being controlled due to PQ
Energy storage device is not involved in frequency modulation, therefore after sudden load increase, the power shortage of generation is undertaken by power grid entirely, and power grid need to send out more power
It can be only achieved power-balance.In Fig. 6, when operation line is thick dashed line f=f2When, reach power-balance PG0 *+PG2'=PL1。
It should be pointed out that the frequency-modulating process of system is the inverse process of the above process, above-mentioned analysis when load reduces suddenly
It stands good.
The multi-power system DQFC analysis examples that the bidirectional energy-storage equipment of electric motor mode droop control participates in are shown in Fig. 7.Mark
Note mode is consistent with Fig. 6.It is noted that bidirectional energy-storage equipment is operated in electric motor mode, frequency characteristic in first quartile,
Actual electric network is powered to bidirectional energy-storage equipment and load.
By Fig. 7 operation lines f=fNCorresponding just equilibrium state obtains
PG0'=PL0+PG0 * (24)
Load increases, and after frequency modulation, frequency declines, and operation line becomes f=f1, it is corresponding end equilibrium state have
PG1'=PL1+PG1 * (25)
Transient process is analyzed, for bidirectional energy-storage equipment, after load increase, passes through few absorption as motor
Active power is adjusted into line frequency, is had
PG0 *-ΔPG *=PG1 * (26)
For actual electric network, frequency adjusting is participated in by issuing additional power
PG0′+ΔPG'=PG1′ (27)
For load, the adjustment effect of itself, does not have
PL0+ΔPL0=PL1 (28)
Simultaneous formula (24)~(28) can obtain " fundamental relation one " identical with formula (22).By geometrical relationship, it is easy to get and formula
(23) identical " fundamental relation two ".As it can be seen that the bidirectional energy-storage equipment for being operated in electric motor mode theoretically has and generator
The identical fm capacity of pattern and effect.
The bidirectional energy-storage equipment of electric motor mode PQ controls is discussed below.It is double when bidirectional energy-storage equipment is controlled using PQ
To the absorbent power tracking P of storageG0 *.After sudden load increase, bidirectional energy-storage equipment cannot participate in adjusting by way of few absorbed power
Frequently, system frequency is made to reduce more.When operation line is thick dashed line f=f2When, just reach power-balance, there is PG2'=PL1+PG0 *。
Frequency-modulating process in the case of load anticlimax is the inverse process of the above process, and the analysis method of use is identical.
Claims (8)
1. a kind of dual quadrant frequency-response analysis method suitable for bidirectional energy-storage equipment.It is characterized in that, active power is cross
Coordinate, system frequency are ordinate, and analysis object is located at the first and second quadrant.This method constructs unified power reference system,
Not only solve the problems, such as the reference value, single supply problem and single dimension problem of legacy frequencies analysis method, additionally it is possible to bidirectional energy-storage
The primary frequency modulation of equipment and complicated multi-power system, frequency modulation frequency modulation mechanism carry out qualitative and quantitative analysis.The multi-power system can
By the two-way of generating set, infinite bulk power grid, actual electric network and various control policy distribution motor mode/electric motor mode operation
Energy storage device is composed.
2. reference value problem according to claim 1, which is characterized in that
The active power reference direction of load is just that the active power reference direction of generator is to send out wattful power with absorbed power
Rate is that just, there are certain cognition difficulty, when analysis may cause unnecessary misunderstanding；
For the problem, using Motor convention come regulation positive direction.No matter for generating equipment or electrical equipment, with from electricity
The direction of net absorbed power is just that the direction to send out power to power grid is negative.It will power generation under unified power reference direction
Equipment and electrical equipment are distinguished, and assign their specific physical significances, will not be generated not because reference direction is inconsistent
Necessary misunderstanding.
3. single supply problem described in claim 1, which is characterized in that
Conventional method be commonly used to analysis single supply stand alone as load power supply (or all power supplys are equivalent to an equivalent power supply) when
Frequency characteristic, it is difficult to analyze the power supplys of different difference coefficients jointly and be the frequency modulation characteristic of load power supply；
For the problem, conventional method is subjected to dimension expansion, the steady-state operating condition of system is indicated with operation line (rather than fortune
Row point), and then the power supply that can complete different difference coefficients is the frequency modulation characteristic analysis of load power supply jointly, is suitable for containing more
The complicated micro-capacitance sensor of a power supply.
4. single dimension problem described in claim 1, which is characterized in that
Conventional method can only indicate the frequency modulation characteristic of generator hair power, and for having generator mode and electric motor mode two
The bidirectional energy-storage equipment of dimension, it is difficult to carry out frequency modulation analysis；
For the problem, after the expansion that conventional method is carried out to dimension, this kind of analysis method is not only applicable to single generator, and
And (energy-storage battery, electric vehicle etc. can be set what electric generator/electric motor two states were run suitable for bidirectional energy-storage equipment
It is standby).
5. the property difference between generator described in claim 1, ideal power grid and actual electric network, passes through static frequency characteristic
The slope of line shows；
The slope of generator is more than actual electric network, and the slope of actual electric network is more than ideal power grid, and the slope of ideal power grid is 0.
6. various control strategy described in claim 1, including PQ power limitation controls strategy, droop control strategy, virtual synchronous hair
Motor control strategy etc.；
Frequency characteristic line under PQ power limitation control strategies is vertical with axis of abscissas, droop control strategy and the control of virtual synchronous machine
The frequency characteristic line of strategy has different degrees of slope according to difference coefficient.
7. the difference of generator described in claim 1 and electric motor mode is showed by the position of frequency characteristic line；
If equipment is operated in generator mode, which is located at the second quadrant, i.e., on the left of frequency axis；If equipment work
Make in electric motor mode, which is located at first quartile, i.e., on the right side of frequency axis.
It, should be with the invention reference direction phase 8. the setting of the reference direction in claim 2 and claim 7 is flexibility and changeability
Anti- method can be considered same process.I.e. to be negative from the direction of power grid absorbed power, to send out the direction of power to power grid
For just.
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