CN110336330A - An a kind of air conditioner load virtual synchronous group of planes participates in the regulation method of power grid interaction - Google Patents
An a kind of air conditioner load virtual synchronous group of planes participates in the regulation method of power grid interaction Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Abstract
The invention discloses a kind of regulation methods that an air conditioner load virtual synchronous group of planes participates in power grid interaction, this method is primarily based on the basic functional principle of convertible frequency air-conditioner, frequency converting air-conditioner compressor controlling unit is transformed, transformation air conditioner load virtual synchronous machine regulation-control model is established；Then, compressor of air conditioner load virtual synchronous machine is grouped using the motor dynamic aggregation method based on same tone, equivalent and polymerization；Determine that an air conditioner load virtual synchronous group of planes participates in power grid frequency modulation, peak regulation or emergency DC power support finally, instructing according to operation of power networks status information and distribution scheduling.The ability of regulation and control to air conditioner load can be improved in the present invention；Air conditioner load virtual synchronous machine is actively engaged in power grid demand response simultaneously, improves operation of power networks stability and economy；It can also realize that digital intelligent is dispatched, improve the accuracy and efficiency of intelligent scheduling.
Description
Technical field
The present invention relates to load flexibility regulation and control field more particularly to a kind of air conditioner load virtual synchronous group of planes participation power grid are mutual
Dynamic regulation method.
Background technique
With the continuous improvement of the generations of electricity by new energy permeability such as distributed photovoltaic power generation, wind-power electricity generation, a large amount of power electronics
Low inertia that type power grid access device is embodied, underdamping problem cause huge choose to the safe operation of stablizing of electric system
War.On the other hand, the air conditioner load to rise year by year already takes up three to four one-tenth of big city summer peak load, and continuous worsening
The part throttle characteristics of electric system.For this purpose, the project of a large amount of source-nets-lotus interaction participation peak-load regulating frequency modulation and active service is such as
Fire is such as unfolded to the bitter edible plant, wherein has been subjected to experts and scholars for virtual synchronous machine (VSM) control technology of power electronics inverter
Extensive concern.
Distributed generation resource virtual synchronous generator (VSG) is only relied at this stage to be increasingly difficult to support increasingly huge electric power
System safe and stable operation, therefore how to be conceived to load side, transfer burdened resource participation power grid interaction abundant as correlation
Area research hot spot.Carry out the research of load virtual synchronous machine and interact participation rate for improving load group power grid, enhances electric system
Security and stability has important practical significance.Wherein, convertible frequency air-conditioner is same by its resourceful property, widely distributed property, peak valley
The advantages such as when property and load adjustability show huge load responding and scheduling potentiality.However, there is presently no about virtual
The regulation method of synchronous machine convertible frequency air-conditioner load.
Summary of the invention
Goal of the invention: aiming at the above problems existing in the prior art, a kind of air conditioner load virtual synchronous group of planes ginseng is provided
The regulation method interacted with power grid.
Technical solution: the regulation method that an air conditioner load virtual synchronous group of planes of the present invention participates in power grid interaction includes such as
Lower step: (S1) constructs frequency converting air-conditioner compressor virtual synchronous machine controlling unit, and the frequency converting air-conditioner compressor controlling unit is rung
Should in polymerization quotient control command compressor rotary speed is regulated and controled, or when mains frequency deviation within a predetermined range when to pressure
Contracting machine revolving speed is carried out from master regulation, and the status information of corresponding air conditioner load is sent to polymerization quotient；(S2) polymerization quotient is based on institute
The status information assessment air conditioner load of each air conditioner load of control dispatches potentiality, to be confirmed whether to participate in power grid interaction；(S3) right
The air conditioner load of power grid interaction is participated in confirmation, polymerization quotient is using the motor dynamic aggregation method based on same tone to being controlled
Air conditioner load virtual synchronous machine be grouped, equivalent and polymerization, calculate variable capacity and be simultaneously reported to grid dispatching center；(S4)
Grid dispatching center determines total scheduling capacity according to mains frequency deviation, and the variable capacity according to each polymerization quotient determines each gather
Close the load capacity that quotient needs to cut down；(S5) respectively polymerization quotient is corresponding to the transmission of each air conditioner load according to the load capacity for needing to cut down
Control command, an air conditioner load virtual synchronous group of planes participates in power grid tune according to operation of power networks status information or corresponding control command
Frequently, peak regulation or emergency DC power support；(S6) polymerization quotient waits control centre to feed back electric network state, if mains frequency deviation does not have
The expected step (S2) that then repeats is restored to step (S6), on the contrary then timesharing by batch control of the releasing to each air conditioner load,
It prevents from releasing in control process and generates new large disturbances.
In step (S1), the frequency converting air-conditioner compressor controlling unit of construction include: master controller, respectively with the main control
Device connected communication module, voltage measurement module and virtual synchronous machine VSM controller, the driving circuit being connect with VSM controller,
Input terminal connects the bridge-type all controlled rectifier circuit of driving circuit, input terminal connection bridge-type all controlled rectifier circuit and output end connection pressure
The controllable inverter circuit of the three-phase of contracting machine；Master controller is configured to by voltage measurement module: based on the network voltage of identification
Mains frequency and its deviation are calculated, and is sent to polymerization quotient via communication module using mains frequency deviation as trigger condition, and
When mains frequency deviation within a predetermined range when to the VSM controller send the first frequency modulation instruction with to compressor rotary speed into
It goes from master regulation；The control command of polymerization quotient based on communication module forwarding sends the second frequency modulation to the VSM controller
Instruction；And real time status information is sent to corresponding polymerization quotient via communication module, the real time status information includes realtime power；
VSM controller is configured to respond to the first frequency modulation instruction and the second frequency modulation instructs output potential voltage vector eabc；Driving
Circuit receives the e of VSM controller outputabc, to eabcPark Transformation is carried out, by voltage and current double -loop control, exports pwm pulse
Signal is controlled, is controlled with the output to bridge-type all controlled rectifier circuit；The controllable inverter circuit of three-phase is complete in response to the bridge-type
The output of control rectifying circuit controls compressor rotary speed.
Further, the potential voltage vector eabcIt determines in the following manner:
Wherein, Δ ω=ω-ωref, ω=d θ/dt, ω are the angular frequency of virtual synchronous machine；ωrefFor specified angular frequency；
Δ ω is angular frequency deviation amount；θ is the electrical angle of virtual synchronous machine；PrefFor the ginseng of load virtual synchronous machine LVSM active power
Examine value, PloadFor the active power of LVSM actual absorption；fsFor mains frequency actual value, frefFor mains frequency reference value, fref=
50Hz, KfFor frequency difference coefficient；J and D is respectively the virtual rotation inertia and damped coefficient of virtual synchronous machine；ΔEQ=Kq·
(Qref-Qload), Δ EU=Ku·(Uref-Us)；E is idle-voltage-controlled output voltage, E0For the no-load emf of VSM；MfFor
Virtual mutual inductance amplitude between stator and rotor, ifFor virtual exciting current；ΔEQFor reactive voltage regulated quantity, Δ EUFor voltage
Regulated quantity；KRFor adjustment of field excitation coefficient, KqFor Reactive-power control coefficient, KuFor voltage regulation coefficient；QrefAnd QloadIt is virtual respectively
Synchronous machine load or burden without work sets reference value and practical load or burden without work, UrefAnd UsIt is that system voltage reference value and system are practical respectively
Voltage effective value.
In step (S1), the frequency converting air-conditioner compressor controlling unit when mains frequency deviation within a predetermined range when pair
Compressor rotary speed carries out including: according to active-frequency control equations from master regulation, and the frequency converting air-conditioner compressor controlling unit is certainly
Main response mains frequency deviation, when mains frequency is greater than rated frequency and more than the first setpoint frequency upper limit then operation of air conditioner power
Increase, mains frequency is less than rated frequency and then operation of air conditioner power reduces lower than the second setpoint frequency lower limit.
In step (S1), the control command for polymerizeing quotient be used to set influence the rotary inertia of each air conditioner load frequency modulation characteristic with
The output power of damped coefficient or each air conditioner load of setting.
Step (S3) specifically includes: (S31) chooses the main characteristic parameters work for being able to reflect compressor electric motor operation characteristic
For feature vector, the main characteristic parameters include stator impedance, rotor impedance, mutual inductance, rotary inertia and initial slip；
(S32) classified using fuzzy C-means clustering method to the compressor electric motor for participating in polymerization；(S33) electricity for obtaining cluster
The grouping of machine category, obtains polymerizeing equivalent motor model coefficient, and the institute for polymerizeing equivalent compressor electric motor is further calculated
State main characteristic parameters；(S34) control parameter of assumed load virtual synchronous machine control, based on the polymerization equivalent pressing being calculated
The main characteristic parameters of the electromechanical machine of contracting are controlled equivalent compressor electric motor is polymerize, and are calculated variable capacity and are simultaneously reported to electricity
Net control centre；The control parameter includes sagging coefficient, virtual rotation inertia and damped coefficient.
The utility model has the advantages that compared with the existing technology, the present invention has the following advantages: the 1, present invention sufficiently excavates the regulation of air conditioner load
Potentiality improve air conditioner load demand response ability；2, the air conditioner load in the present invention can autonomous responsive electricity grid frequency variation
Load Regulation is carried out, operation of power networks stability is effectively improved；3, the air conditioner load in the present invention can receive the finger of scheduling system
It enables and carries out accurately Load Regulation, improve system performance driving economy and safety.
Detailed description of the invention
Fig. 1 is the improved air-conditioning system framework of the present invention；
Fig. 2 is that air conditioner load virtual synchronous machine of the present invention regulates and controls framework；
Fig. 3 is the function frequency static characteristic curve that an air conditioner load virtual synchronous group of planes of the present invention participates in primary frequency regulation of power network；
Fig. 4 is the function frequency static characteristic curve that an air conditioner load virtual synchronous group of planes of the present invention participates in electric grid secondary frequency modulation；
Fig. 5 is that air conditioner load virtual synchronous group of planes power grid of the present invention interacts process.
Specific embodiment
It is that the present invention is described in detail in conjunction with attached drawing below.
As shown in figure 5, an air conditioner load virtual synchronous group of planes of the invention participates in the regulation method of power grid interaction, specific steps
Include:
One, frequency converting air-conditioner compressor controlling unit is constructed, transformation air conditioner load virtual synchronous machine regulation-control model is established.
Compressor of air conditioner is the low-pressure steam boil down to high steam heel row of refrigeration system inner refrigerant to condenser, condensation
Device takes away heat by outdoor fan, and high pressure refrigerant vapor is made to be condensed into highly pressurised liquid.Highly pressurised liquid enters evaporator low
Pressure evaporation, draws the heat of surrounding.Indoor fan makes hot-air constantly enter evaporator progress heat exchange, and will become after heat release
Cold air sends interior back to.Such room air constantly circulates, cold and hot exchange, achievees the purpose that reduce temperature.
Convertible frequency air-conditioner increases compressor electric motor frequency control module on the basis of fixed frequency air conditioner, so that compressor rotary speed
Continuously adjustable, temperature change is smoother, and users'comfort is improved.The main circuit of traditional frequency conversion airconditioning control compressor is main
Including full bridge rectifier and the controllable inverter circuit of three-phase.Inverter control is also the speed regulating control ring of compressor electric motor simultaneously
Section, inverter so that convertible frequency air-conditioner output refrigerating capacity is adjustable, realize the fining tune of room temperature to the control of compressor rotary speed
Section.
In order to realize the Precise control to air conditioner load size and participate in the promotion of power grid interaction capability, need to construct new
Frequency converting air-conditioner compressor controlling unit, as shown in Figure 1.Compared with traditional frequency conversion compressor of air conditioner controlling unit, new frequency conversion
Compressor of air conditioner controlling unit includes following improvement:
(1) network voltage, air-conditioning master control system are logical according to instantaneous voltage for identification for installation network voltage measurement module
It crosses quick frequency identification algorithm and mains frequency is calculated, the trigger signal of power grid frequency modulation is participated in using frequency departure as air-conditioning.
(2) virtual synchronous machine (Virtual Synchronous Machine abbreviation VSM) control is carried out to rectification module to change
Make, by tradition can not control rectifying circuit transform bridge-type all controlled rectifier circuit as, and using virtual synchronous machine control method to bridge-type
The output of all controlled rectifier circuit is controlled, then the output via the controllable inverter circuit of three-phase based on bridge-type all controlled rectifier circuit is real
Now to the control of compressor rotary speed.
(3) to communication modules such as air-conditioning system installation WiFi or ZigBee, enable air-conditioning individual and other air-conditionings or tune
Control center to center communications.
More specifically, above-mentioned frequency converting air-conditioner compressor controlling unit includes: master controller, is connected respectively with master controller
Communication module, voltage measurement module and virtual synchronous machine VSM controller, the driving circuit being connect with VSM controller, input terminal
Connect the bridge-type all controlled rectifier circuit, input terminal connection bridge-type all controlled rectifier circuit and output end connect compressor of driving circuit
The controllable inverter circuit of three-phase.Master controller is configured to based on voltage measurement module: (a) calculating electricity according to the network voltage of identification
Net frequency and its deviation, and it is sent to polymerization quotient via communication module using mains frequency deviation as trigger condition, and when electricity
Net exemplary frequency deviation values within a predetermined range when to VSM controller send the instruction of the first frequency modulation to carry out compressor rotary speed from homophony
Control；(b) control command of the polymerization quotient based on communication module forwarding sends the instruction of the second frequency modulation to VSM controller；And (c) via
Communication module sends real time status information to corresponding polymerization quotient, and real time status information includes realtime power.VSM controller is configured
To control in response to the instruction of the first frequency modulation and the instruction of the second frequency modulation the output of driving circuit, driving circuit is further controlled
The output of bridge-type all controlled rectifier circuit, then via the controllable inverter circuit of three-phase to control compressor rotary speed.
Virtual synchronous machine control technology is used to compressor rectification module, establishes convertible frequency air-conditioner load virtual synchronous machine mould
Type.
Assuming that the number of pole-pairs of virtual synchronous machine is 1, then synchronous machine equation of rotor motion and the sagging control of function frequency are combined, it can
To obtain active-frequency control equations (i.e. the VSM equation of motion) of load virtual synchronous machine are as follows:
Wherein, Δ ω=ω-ωref,ω is the angular frequency of virtual synchronous machine；ωrefFor specified angular frequency；Δω
For angular frequency deviation amount；θ is the electrical angle of virtual synchronous machine.PrefFor the reference of load virtual synchronous machine (LVSM) active power
Value, PloadFor the active power of LVSM actual absorption；fsFor mains frequency actual value, fref(i.e. for mains frequency reference value
50Hz), KfFor frequency difference coefficient；J and D is respectively the virtual rotation inertia and damped coefficient of virtual synchronous machine.
Virtual synchronous machine simulation synchro generator excitation adjuster is idle-voltage control, in conjunction with synchronous machine electromagnetic equation, obtain
Idle-voltage governing equation (i.e. VSM electromagnetic equation) of LVSM is as follows:
Wherein, Δ EQ=Kq·(Qref-Qload), Δ EU=Ku·(Uref-Us).E is idle-voltage-controlled output electricity
Pressure, E0For the no-load emf of VSM；MfVirtual mutual inductance amplitude between stator and rotor, ifFor virtual exciting current；ΔEQFor
Reactive voltage regulated quantity, Δ EUFor voltage-regulation amount；KRFor adjustment of field excitation coefficient, KqFor Reactive-power control coefficient, KuFor voltage adjusting
Coefficient；QrefAnd QloadIt is virtual synchronous machine load or burden without work setting reference value and practical load or burden without work, U respectivelyrefAnd UsIt is respectively
System voltage reference value and system virtual voltage virtual value.
Convolution (1) and formula (2) obtain the potential voltage vector e of virtual synchronous machineabc, it is as follows:
What formula (1) reflected is the relationship between mains frequency deviation and air-conditioning active power, and frequency departure influences air-conditioning function
The size of rate.What formula (2)-(3) were reflected is the relationship of air-conditioning reactive power and network voltage, and voltage deviation influences the idle function of air-conditioning
Rate size, voltage is higher than rated value, and then air conditioner load increases.In summary, reactive voltage adjusts part and active frequency in model
Part is adjusted using traditional droop control technology, makes load virtual synchronous machine active and reactive power track frequency, voltage change.
Virtual synchronous machine output voltage and virtual electrical angle are obtained by the electromagnetic equation and the equation of motion of virtual synchronous generator, thus
Establish the potential voltage vector e of virtual synchronous machineabc。
Based on above-mentioned established frequency converting air-conditioner compressor rectification circuit virtual synchronous machine Controlling model, VSM controller warp
Just it is able to respond and the output of bridge-type all controlled rectifier circuit is controlled in the instruction of the first frequency modulation and the instruction of the second frequency modulation.It is specific and
Speech, VSM controller instruct output potential voltage vector e with the second frequency modulation based on the first frequency modulation instruction from master controllerabc。
Driving circuit receives the e of VSM controller outputabc, to virtual potential vector eabcPark Transformation is carried out, it is bicyclic by voltage and current
Control, output pwm pulse control signal, drive bridge-type all controlled rectifier circuit to work in such a way that SVPWM is controlled.Whole process
As shown in Figure 2.
Two, polymerization quotient dispatches potentiality based on the status information assessment air conditioner load of each air conditioner load controlled, with confirmation
Whether power grid interaction is participated in
In the step, the status information of each air conditioner load includes the operating status of each air conditioner load, e.g. in unlatching
State is in closed state.Status information based on each air conditioner load can learn the sky of the open state of polymerization quotient's control
The number of load is adjusted, so that Load aggregation quotient be made to complete the assessment for dispatching potentiality to its air conditioner load by the method for polymerization.Root
According to assessment result, when schedulable air conditioner load reaches particular preset value, load quotient, which can choose, participates in power grid interaction.
Three, the polymerization quotient that confirmation participates in power grid interaction uses the motor dynamic aggregation method based on same tone to being controlled
Air conditioner load virtual synchronous machine be grouped, equivalent and polymerization, and the variable capacity that polymerization obtains is reported to dispatching of power netwoks
Center
Actual air conditioner load has dispersibility and otherness, and a large amount of air conditioner loads are random to be dispersed in power distribution network not
At node.Therefore, it is necessary to by a large amount of air conditioner load resource polymerization at load group, in order to Load aggregation quotient/sale of electricity quotient couple
Air conditioner load group is effectively controlled and is dispatched, so that accurately and timely responsive electricity grid regulates and controls demand.
Compressor of air conditioner load virtual synchronous machine is grouped using the motor dynamic aggregation method based on same tone,
Equivalent and polymerization, the specific steps are as follows:
1. choosing the major parameter for being able to reflect compressor electric motor operation characteristic as feature vector.
When polymerizeing to air conditioner compressor motor, the motor stator reactance X of each compressor of air conditioner is selecteds, rotor electricity
Anti- Xr', mutual inductance Lm, rotary inertia JaWith initial slip s0Form the feature vector [X of the compressor of air conditioners,Xr′,Lm,Ja,
s0], each compressor load is grouped according to this feature vector, ignores the difference of motor slip in every group, that is, thinks same group
Motor speed is identical (i.e. same tone).
2. being classified using fuzzy C-means clustering method to the compressor electric motor for participating in polymerization.
N platform motor in total is divided into c classification, c cluster centre is randomly generated, calculates the feature vector of each motor k
xkWith each cluster centre wiSquare distance (dik)2=xk-wiWith degree of membership uik.Objective function are as follows:
Wherein,J ∈ [0,2] is a weighting coefficient.By iteration, constantly updates degree of membership and gather
Class center reaches setting number less than given threshold or the number of iterations until objective function variable quantity.
3. the motor category that cluster is obtained is grouped, and the equivalent motor model coefficient of polymerization is calculated.According to promise
Theorem, further calculates to obtain and polymerize the parameters such as the rotor impedance of equivalent motor.It polymerize the calculating of equivalent motor model coefficient
Method may refer to " the motor dynamic aggregation method based on same tone ", and (Zhang Jian, Sun Yuanzhang, Xu's arrow etc., electric system is automatic
Change, 2010,34 (05): 48-52).
4. the control parameter of assumed load virtual synchronous machine control, based on the characteristic parameter being calculated to polymerization etc.
Value compressor electric motor is controlled, and is calculated variable capacity and is reported to grid dispatching center；The control parameter includes sagging system
Number, virtual rotation inertia and damped coefficient.
Four, grid dispatching center determines total scheduling capacity according to mains frequency deviation, and according to the adjustable of each polymerization quotient
Capacity determines the load capacity that each polymerization quotient needs to cut down
After each polymerization discusses and calculates respective variable capacity and report grid dispatching center, grid dispatching center can root
Total scheduling capacity is allocated according to the ratio of each polymerization quotient's variable capacity.In other situations, point of total scheduling capacity
With that can also consider other safety factors or other needs on the basis of pressing variable capacity pro rate, to each polymerization quotient's
Allocation proportion is adjusted.
Five, the load capacity that respectively polymerization quotient cuts down according to needs sends corresponding control command, air-conditioning to each air conditioner load
A load virtual synchronous group of planes participates in power grid frequency modulation, peak regulation or tight according to operation of power networks status information and/or corresponding control command
Anxious power is supported
According to operation of power networks status information, a convertible frequency air-conditioner load load virtual synchronous group of planes will be used for power grid by Effective Regulation
Once, frequency modulation frequency modulation or peak regulation and emergency DC power support.
(1) primary frequency regulation of power network is participated in
It is to assign control without polymerizeing quotient from main response from main response that air conditioner load virtual synchronous machine, which participates in primary frequency regulation of power network,
System order, belongs to droop control.An air conditioner load virtual synchronous group of planes by the load virtual synchronous machine in formula (1) it is active-frequency
Control, autonomous responsive electricity grid frequency departure: when system frequency falls rated frequency and is lower than the lower-frequency limit of primary frequency modulation, air-conditioning
Consumption power, which reduces and slows down frequency, falls speed；Frequency rises to rated frequency or more and is higher than the upper frequency limit of primary frequency modulation
When, air-conditioning consumption power increases and slows down the frequency rate of climb.The function frequency static characteristic curve of analogy virtual synchronous generator and
The function frequency static characteristic curve of burden with power obtains the function frequency static characteristic song that air conditioner load virtual synchronous machine participates in primary frequency modulation
Line is as shown in Fig. 3.When system frequency is from f0Drop into f1When, air-conditioning group load is from PL0Drop to PL1。
(2) frequency modulation frequency modulation is participated in
Air conditioner load virtual synchronous machine can also receive dispatch command and participate in frequency modulation frequency modulation.In step 4 (i.e. control centre
Total scheduling capacity is determined according to frequency departure amount and is assigned to each air conditioner load polymerization quotient, and polymerization quotient is assigned to scheduling capacity
Each air conditioner load virtual synchronous group of planes group) after, it is virtual by polymerizeing each air conditioner load of control command setting influence that quotient assigns
The control parameter (for example, virtual rotation inertia J and damped coefficient D) of synchronous machine group frequency modulation characteristic, reaches non differential regulation
Effect, thus an air conditioner load virtual synchronous group of planes carry out electric grid secondary frequency modulation.Such as Fig. 4, P in figureLAnd PGTo be born in frequency-modulating process
Lotus and generator function frequency static characteristic curve, rated operation point is O at this time.When the load in system increases Δ P suddenly, load
Function frequency static characteristic curve rise to PL', operating point becomes O ', and system frequency drops to f1.Air conditioner load virtual synchronous machine at this time
Group carries out frequency modulation frequency modulation, sets suitable J, D parameter, load function frequency curve becomes PL", air-conditioning LVSM reduces load Δ P ', frequency
Rate rises to f2.When controllable air conditioner load is enough, PL" meeting and PGAgain O point is intersected at, system is made to return to specified operation shape
State.
(3) peak regulation or emergency DC power support are participated in
An air conditioner load virtual synchronous group of planes is negative to change air-conditioning by receiving Load aggregation quotient/sale of electricity quotient control instruction
The control parameter of lotus virtual synchronous machine is (for example, virtual rotation inertia J, damped coefficient D and load virtual synchronous machine LVSM wattful power
The reference value of rate), to carry out rapidly load adjustment, participate in peak load regulation network or emergency DC power support.Air conditioner load is virtually same
A step group of planes can determine compressor of air conditioner working condition by way of setpoint power output, realize in the air conditioner load short time
(not influencing comfort level) is in [Pmin,Pmax] freely regulating and controlling in range, wherein 0 < Pmin<Pmax.As a result,
Six, polymerization quotient waits control centre to feed back electric network state, repeats if mains frequency deviation does not reach expected
Step 2 is executed to step 6, on the contrary then timesharing prevents from producing in releasing control process by batch control of the releasing to each air conditioner load
Raw new large disturbances.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of regulation method that an air conditioner load virtual synchronous group of planes participates in power grid interaction, which comprises the steps of:
(S1) construct frequency converting air-conditioner compressor virtual synchronous machine controlling unit, the frequency converting air-conditioner compressor controlling unit in response to
Polymerization quotient control command compressor rotary speed is regulated and controled, or when mains frequency deviation within a predetermined range when to compressor
Revolving speed is carried out from master regulation, and the status information of corresponding air conditioner load is sent to polymerization quotient；
(S2) polymerization quotient dispatches potentiality based on the status information assessment air conditioner load of each air conditioner load controlled, to be confirmed whether
Participate in power grid interaction；
(S3) air conditioner load of power grid interaction is participated in for confirmation, polymerization quotient uses the motor dynamic aggregation side based on same tone
Method is grouped the air conditioner load virtual synchronous machine controlled, equivalence and polymerization, calculating variable capacity are simultaneously reported to power grid tune
Degree center；
(S4) grid dispatching center determines total scheduling capacity, and the variable capacity according to each polymerization quotient according to mains frequency deviation
Determine the load capacity that each polymerization quotient needs to cut down；
(S5) load capacity that respectively polymerization quotient cuts down according to needs sends corresponding control command, air conditioner load to each air conditioner load
A virtual synchronous group of planes participates in power grid frequency modulation, peak regulation or urgent power branch according to operation of power networks status information or corresponding control command
It helps.
2. an a kind of air conditioner load virtual synchronous group of planes according to claim 1 participates in the regulation method of power grid interaction, special
Sign is, further includes following steps:
(S6) polymerization quotient waits control centre to feed back electric network state, repeats to hold if mains frequency deviation does not return to expection
Row step (S2) to step (S6), on the contrary then timesharing prevents from releasing in control process by batch control of the releasing to each air conditioner load
Generate new large disturbances.
3. an air conditioner load virtual synchronous group of planes according to claim 1 participates in the regulation method of power grid interaction, feature exists
In, in step (S1), the frequency converting air-conditioner compressor controlling unit of construction include: master controller, respectively with the master controller phase
Communication module, voltage measurement module and virtual synchronous machine VSM controller even connect driving circuit, input terminal with VSM controller
Connect the bridge-type all controlled rectifier circuit, input terminal connection bridge-type all controlled rectifier circuit and output end connect compressor of driving circuit
The controllable inverter circuit of three-phase；
Master controller is configured to based on voltage measurement module:
Calculate mains frequency and its deviation according to the network voltage of identification, and using mains frequency deviation as trigger condition via
Communication module be sent to polymerization quotient, and when mains frequency deviation within a predetermined range when to the VSM controller send first
Frequency modulation instruction is to carry out from master regulation compressor rotary speed；
The control command of polymerization quotient based on communication module forwarding sends the instruction of the second frequency modulation to the VSM controller；And
Real time status information is sent to corresponding polymerization quotient via communication module, the real time status information includes realtime power；
VSM controller is configured to respond to the first frequency modulation instruction and the second frequency modulation instructs output potential voltage vector eabc；
Driving circuit receives the e of VSM controller outputabc, to eabcPark Transformation is carried out, it is defeated by voltage and current double -loop control
Pwm pulse controls signal out, is controlled with the output to bridge-type all controlled rectifier circuit；
The controllable inverter circuit of three-phase controls compressor rotary speed in response to the output of the bridge-type all controlled rectifier circuit.
4. an air conditioner load virtual synchronous group of planes according to claim 3 participates in the regulation method of power grid interaction, feature exists
In the potential voltage vector eabcIt determines in the following manner:
Wherein, Δ ω=ω-ωref, ω=d θ/dt, ω are the angular frequency of virtual synchronous machine；ωrefFor specified angular frequency；Δω
For angular frequency deviation amount；θ is the electrical angle of virtual synchronous machine；PrefFor the reference value of load virtual synchronous machine LVSM active power,
PloadFor the active power of LVSM actual absorption；fsFor mains frequency actual value, frefFor mains frequency reference value, fref=50Hz,
KfFor frequency difference coefficient；J and D is respectively the virtual rotation inertia and damped coefficient of virtual synchronous machine；ΔEQ=Kq·(Qref-
Qload), Δ EU=Ku·(Uref-Us)；E is idle-voltage-controlled output voltage, E0For the no-load emf of VSM；MfFor stator
Virtual mutual inductance amplitude between rotor, ifFor virtual exciting current；ΔEQFor reactive voltage regulated quantity, Δ EUFor voltage adjusting
Amount；KRFor adjustment of field excitation coefficient, KqFor Reactive-power control coefficient, KuFor voltage regulation coefficient；QrefAnd QloadIt is virtual synchronous respectively
Machine load or burden without work sets reference value and practical load or burden without work, UrefAnd UsIt is system voltage reference value and system virtual voltage respectively
Virtual value.
5. an air conditioner load virtual synchronous group of planes according to claim 1 participates in the regulation method of power grid interaction, feature exists
In, in step (S1), the frequency converting air-conditioner compressor controlling unit when mains frequency deviation within a predetermined range when to compression
Machine revolving speed carries out from master regulation including: according to active-frequency control equations, and the frequency converting air-conditioner compressor controlling unit is independently rung
Mains frequency deviation is answered, when mains frequency is greater than rated frequency and more than the then operation of air conditioner power increasing of the first setpoint frequency upper limit
Greatly, mains frequency is less than rated frequency and then operation of air conditioner power reduces lower than the second setpoint frequency lower limit.
6. an air conditioner load virtual synchronous group of planes according to claim 1 participates in the regulation method of power grid interaction, feature exists
In in step (S1), the control command for polymerizeing quotient is used to set the rotary inertia for influencing each air conditioner load frequency modulation characteristic and damping
The output power of coefficient or each air conditioner load of setting.
7. an air conditioner load virtual synchronous group of planes according to claim 1 participates in the regulation method of power grid interaction, feature exists
In step (S3) specifically includes:
(S31) main characteristic parameters for being able to reflect compressor electric motor operation characteristic are chosen as feature vector, the main spy
Levying parameter includes stator impedance, rotor impedance, mutual inductance, rotary inertia and initial slip；
(S32) classified using fuzzy C-means clustering method to the compressor electric motor for participating in polymerization；
(S33) the motor category for obtaining cluster is grouped, and obtains polymerizeing equivalent motor model coefficient, and be further calculated
It polymerize the main characteristic parameters of equivalent compressor electric motor；
(S34) control parameter of assumed load virtual synchronous machine control, based on the equivalent compressor electric motor of polymerization being calculated
The main characteristic parameters are controlled equivalent compressor electric motor is polymerize, and are calculated variable capacity and are reported in dispatching of power netwoks
The heart；The control parameter includes sagging coefficient, virtual rotation inertia and damped coefficient.
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