CN110323763A - A kind of inverter frequency modulation method of comprehensive rotatory inertia simulation and primary frequency modulation control - Google Patents
A kind of inverter frequency modulation method of comprehensive rotatory inertia simulation and primary frequency modulation control 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
- 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 the inverter frequency modulation methods of a kind of comprehensive rotatory inertia simulation and primary frequency modulation control, primary frequency modulation detects the real-time frequency of inverter power supply by phaselocked loop, correspondingly change the power output of generating set according to the difference coefficient of the frequency variation of the inverter power supply detected and set generating set, it is to belong to sagging control by adjusting the active and reactive voltage to control the frequency and inverter power supply of inverter power supply；The simulation of rotatory inertia is the feedback quantity by calculating the electromagnetic power of inverter power supply in real time as control, and the frequency variation of corresponding inverter power supply is calculated using equation of rotor motion, to realize the quick sampling to the internal frequency of inverter power supply；Therefore the simulation of rotatory inertia is the output frequency that inverter power supply is controlled by the energy variation of inverter power supply internal system, belongs to control of hanging down of falling down in itself.
Description
Technical field
The present invention relates to the inverter frequency modulation methods of a kind of comprehensive rotatory inertia simulation and primary frequency modulation control, belong to inversion
The technical field of device primary frequency modulation control.
Background technique
The problem of bringing with traditional fossil energy consumption gets worse, and renewable energy power generation is received with interconnection technology
Domestic and international extensive concern, practical grid connection capacity and ratio are higher and higher.Gird-connected inverter is connect as photovoltaic power generation with bulk power grid
Important device, excellent performance is shown when stable state is grid-connected, but when system is in the transient state situations such as failure, it is poor
Dynamic property is unfavorable for the stabilization of power grids.After the isolated access power grid of extensive new energy, it is since the characteristic of its own can reduce
The inertia for entirety of uniting is insufficient so as to cause the practical fm capacity of system.When there is larger amplitude due to burst accident in system
When the disturbance of degree, it tends to be difficult to guarantee the stability of system frequency, therefore to the light of meter and equivalent rotary inertia and primary frequency modulation
Volt inverter power supply complex control system is studied, and has theoretical significance and engineering application value.
This patent proposes a kind of comprehensive rotatory inertia simulation and primary frequency modulation control for the primary frequency modulation of inverter power supply
The inverter frequency modulation method of system.Under the control of the inverter power supply, when the microvariations within dead zone occur for system, only lean on
Equivalent rotary inertial supports, and when the relatively large disturbances outside dead zone occur for system, equivalent rotary inertia and primary frequency modulation
Control functions both on.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of existing technologies, a kind of comprehensive rotatory inertia simulation is provided
With the inverter frequency modulation method of primary frequency modulation control, inverter is enabled to precisely and not excessively to carry out primary frequency modulation tracking
Control, close to the machinery inertial of synchronous generator, reaches the condition to grid-connected close friend.
In order to achieve the above objectives, the present invention provides the inverter tune of a kind of comprehensive rotatory inertia simulation and primary frequency modulation control
Frequency method, primary frequency modulation detects the real-time frequency of inverter power supply by phaselocked loop, according to the frequency of the inverter power supply detected
The difference coefficient of rate variable quantity and set generating set correspondingly changes the power output of generating set, be by adjust it is active,
The idle voltage to control the frequency and inverter power supply of inverter power supply, belongs to sagging control；The simulation of rotatory inertia is logical
Feedback quantity of the electromagnetic power for calculating inverter power supply in real time as control is crossed, and corresponding inverse using equation of rotor motion calculating
Become the frequency variation of device power supply, to realize the quick sampling to the internal frequency of inverter power supply；Therefore rotatory inertia
Simulation is the output frequency that inverter power supply is controlled by the energy variation of inverter power supply internal system, is belonged in itself
It falls down control of hanging down.
Preferentially, the control of the simulation of rotatory inertia and primary frequency modulation is coordinated by setting primary frequency modulation dead zone；Work as hair
After raw microvariations, when the frequency of inverter power supply is changed in set primary frequency modulation dead zone, only rotatory inertia ring at this time
Section movement；After occurring compared with large disturbances, when the frequency variation of inverter power supply is beyond set primary frequency modulation dead zone, then mainly
It is controlled by primary frequency modulation；The simulation link of rotatory inertia all could be made that response inside and outside primary frequency modulation controlling dead error,
It is unrelated whether movement with primary frequency modulation controlling unit；
Preferentially, comprising the following steps:
Step 1, after system disturbs, rotatory inertia simulation link starts to act, and passes through high speed and real time sampling first
The voltage and current signal of grid entry point PCC calculates the real-time electromagnetic power P of three phase mains in real timek:
Pk=uaia+ubib+ucic,
Wherein, ua、ub、ucThe respectively voltage of three phase mains, ia、ibAnd icRespectively ua、ub、uc；Corresponding electric current；From
And obtain real-time electromagnetic power Pk, then the real-time electromagnetic power P that primary Calculation is obtainedkIt obtains stablizing by low-pass filter defeated
Real-time stabilization electromagnetic power P outk *；
In view of the electromagnetic power P of the three phase mains of actual measurementeWaveform there are random fluctuations, in order to inhibit random wave
Dynamic influence, by calculating n real-time stabilization electromagnetic power P before the moment in real timek *Obtain power average value PaveIt is filtered as number
Wave device, by power average value PaveWith real-time stabilization electromagnetic power Pk *Δ P is calculated to obtain as differencee；Wherein, real-time stabilization electromagnetic power
Pk *With the average value P of preceding n poweraveCalculation formula it is as follows:
Step 2 defines electromagnetic power amount of unbalance according to the small-signal model under equation of rotor motion per unit value are as follows:
ΔPe=-(Pk-Pave)
As Δ Pe < 0, the energy-storage travelling wave tube of inverter internal absorbs excess energy, rises along with frequency；When Δ Pe > 0
When, the energy-storage travelling wave tube of inverter internal should discharge energy storage.
Preferentially, the simulation of rotatory inertia and the control of primary frequency modulation all consider the internal frequency spy of inverter power supply
Property, equation of rotor motion has all been used, the relevance of control strategy is strengthened；The simulation of rotatory inertia and the control of primary frequency modulation
Difference is that equation of rotor motion carries out the frequency control of power versus frequency response in the control of primary frequency modulation；And in rotatory inertia
Simulation in, equation of rotor motion carries out for realizing the quick sampling of the internal frequency to inverter power supply in inverter
Portion's energy storage quickly changes the deviation control of diagonal frequencies.
Preferentially, step 2 is further comprising the steps of: the complexity in order to reduce model, and controller selects synchronous generator
Second-order model:
J is mechanical rotary inertia, TmFor the mechanical force moment of prime mover, TeFor the electromagnetic torque of generator, ω is actual corners speed
Degree, t is time, PTFor the mechanical output of generator, PeFor the electromagnetic power of generator, ωnFor rated speed；
When primary frequency modulation, inverter primary frequency modulation droop control device model is established:
PT=Pref+(f-fref)/δ
In formula, PrefRefer to and give with reference to mechanical output, f refers to real-time frequency, frefIt is given reference frequency, δ refers to
The difference coefficient of generating set；When inverse appliances power source system is stablized, difference 0, when net side disturbs, Δ Pe≠0；It examines
Consider electromagnetic power PeBe negative coefficient entry in equation of rotor motion, thus negative sign is taken before departure, establishes rotor motion side
Small-signal model under journey per unit value:
ΔPe=-(Pk-Pave),
In formula, Δ Pe refers to departure of the electromagnetic power in equation of rotor motion；PkRefer to real-time electromagnetic power；
PaveRefer to power average value；△ Pm refers to the variable quantity of mechanical output；Δ W is inner corners frequency variation；The mould of rotatory inertia
When quasi-, by Δ PeIt is sent into equation of rotor motion, internal angular frequency variation delta ω ' is sought in realization；Wherein, by PaveIt is equivalent
For electromagnetic power, during microvariations, after being linearized near stable operating point, it is believed that Δ Pm=0, and then can be with according to above formula
Calculate corresponding internal rotation/angular frequency variation.
Preferentially, step 2 is further comprising the steps of: after inverter power supply system disturbs, phaselocked loop starts to detect
The real-time frequency of inverter power supply, it is poor that the real-time frequency f of collected inverter power supply and rated frequency fn is made, and takes absolutely
Value is compared with the threshold value of dead zone；When the absolute value of Δ f is greater than dead zone threshold value, primary frequency modulation controlling unit starts to act, and finds out outer
Portion angular frequency variation delta ω.
Preferentially, step 3, by the inner corners frequency variation Δ ω ' and external angular frequency variation delta ω in step 2
As the phase bit instruction of inverter power supply output voltage, phase bit instruction will be used for the coordinate transform of inner ring.
Preferentially, step 4: comprehensively considering voltage feed-forward control item and current feedback item, obtains desired output grid entry point
The d axis component U of reference voltagemdWith q axis component Umq, it is converted in conjunction with the anti-Park that phase bit instruction realizes dq coordinate to abc coordinate,
It is sent into PWM modulation later and generates control signal.
Preferentially, step 5: the ratio of the initial power of power deviation amount Δ Pe and inverter in step 2 is carried out
Amendment, as the amendment to step 4 voltage signal.
Preferentially, it step 6: is obtained according to the exploitation of the frequency variation Δ f of inverter power supply and difference coefficient δ
Correspondingly active increment, the reference value Pref of photovoltaic output power changes at this time, controls adjustment power tracking by non-MPPT
Point increases or decreases output power to participate in the control of primary frequency modulation.
Advantageous effects of the invention:
One kind provided by the invention can integrate the inverter power supply of rotatory inertia simulation with primary frequency modulation control, once adjust
When microvariations occurring in frequency controlling dead error, the inertia effect of similar synchronous generator, and inverter are realized by the variation of energy storage
When simulating rotatory inertia, internal control is only carried out；After being more than the dead zone range of primary frequency modulation, become according to the frequency detected
Change amount and set difference coefficient correspondingly change power output, to carry out primary frequency modulation control.Therefore, this inverter power supply
Shake or excessive tracing control are prevented, so that the control of system is more accurate, to grid-connected more friendly.
Detailed description of the invention
Fig. 1 is the principle of the present invention block diagram；
Fig. 2 is control block diagram of the invention.
Specific embodiment
The following examples are only intended to illustrate the technical solution of the present invention more clearly, and cannot be used as a limitation the limitation present invention
Protection scope.
Refering to fig. 1, the realization of primary frequency modulation link is frequency to be detected by PLL (phaselocked loop), and itself and rated value are made
It is compared after difference with set dead zone, to judge whether to start primary frequency modulation measure, and is become according to the frequency detected
Change amount and set difference coefficient correspondingly change power output, so as to adjust frequency；And the link of rotatory inertia simulation is basis
The departure of load instantaneous power and mean power carries out the foundation of energy conversion as internal energy-storage travelling wave tube: interior as Δ P < 0
The decline of portion's frequency, the energy-storage travelling wave tube inside inverter power supply discharges energy storage at this time；As Δ P > 0, internal frequency rises.Two kinds of controls
System has used equation of rotor motion, strengthens the relevance of control strategy.
When load disturbance occurs for system, whether no matter primary frequency modulation controlling unit acts, rotatory inertia simulates link all
It will correspondingly respond, this control for not completely depending on acquisition External frequency signals, it being capable of more acurrate performance inverter electricity
The characteristic of source participation power-balance.When the frequency after disturbing changes within set primary frequency modulation dead zone, at this time
Only rotatory inertia link acts, and when frequency variation is beyond set primary frequency modulation dead zone, then rely primarily on primary tune
Frequency is controlled.
A kind of inverter frequency modulation method of comprehensive rotatory inertia simulation and primary frequency modulation control, primary frequency modulation pass through phaselocked loop
The real-time frequency for detecting inverter power supply, according to the frequency variation of the inverter power supply detected and set generating set
Difference coefficient correspondingly change the power output of generating set, be by adjusting the active and reactive frequency to control inverter power supply
With the voltage of inverter power supply, belong to sagging control；The simulation of rotatory inertia is the electromagnetism by calculating inverter power supply in real time
Feedback quantity of the power as control, and the frequency variation of corresponding inverter power supply is calculated using equation of rotor motion, thus
Realize the quick sampling to the internal frequency of inverter power supply；Therefore the simulation of rotatory inertia is by inverter power supply system
The energy variation in portion controls the output frequency of inverter power supply, belongs to control of hanging down of falling down in itself.
Further, the control of the simulation of rotatory inertia and primary frequency modulation is coordinated by setting primary frequency modulation dead zone；When
After microvariations occur, when the frequency of inverter power supply is changed in set primary frequency modulation dead zone, only rotatory inertia at this time
Link movement；After occurring compared with large disturbances, when the frequency variation of inverter power supply is beyond set primary frequency modulation dead zone, then lead
It to be controlled by primary frequency modulation；The simulation link of rotatory inertia all could be made that sound inside and outside primary frequency modulation controlling dead error
It answers, it is unrelated whether movement with primary frequency modulation controlling unit；
Further, comprising the following steps:
Step 1, after system disturbs, rotatory inertia simulation link starts to act, and passes through high speed and real time sampling first
The voltage and current signal of grid entry point PCC calculates the real-time electromagnetic power P of three phase mains in real timek:
Pk=uaia+ubib+ucic,
Wherein, ua、ub、ucThe respectively voltage of three phase mains, ia、ibAnd icRespectively ua、ub、uc；Corresponding electric current；From
And obtain real-time electromagnetic power Pk, then the real-time electromagnetic power P that primary Calculation is obtainedkIt obtains stablizing by low-pass filter defeated
Real-time stabilization electromagnetic power P outk *；
In view of the electromagnetic power P of the three phase mains of actual measurementeWaveform there are random fluctuations, in order to inhibit random wave
Dynamic influence, by calculating n real-time stabilization electromagnetic power P before the moment in real timek *Obtain power average value PaveIt is filtered as number
Wave device, by power average value PaveWith real-time stabilization electromagnetic power Pk *Δ P is calculated to obtain as differencee；Wherein, real-time stabilization electromagnetic power
Pk *With the average value P of preceding n poweraveCalculation formula it is as follows:
Wherein, it is positive integer, Pi P that n, which is less than k, n and k,k *
Step 2 defines electromagnetic power amount of unbalance according to the small-signal model under equation of rotor motion per unit value are as follows:
ΔPe=-(Pk-Pave)
As Δ Pe < 0, the energy-storage travelling wave tube of inverter internal absorbs excess energy, rises along with frequency；When Δ Pe > 0
When, the energy-storage travelling wave tube of inverter internal should discharge energy storage.
Further, the simulation of rotatory inertia and the control of primary frequency modulation all consider the internal frequency of inverter power supply
Characteristic has all used equation of rotor motion, strengthens the relevance of control strategy；The simulation of rotatory inertia and the control of primary frequency modulation
System difference is that equation of rotor motion carries out the frequency control of power versus frequency response in the control of primary frequency modulation；And it is used in rotation
Property simulation in, equation of rotor motion will carry out inverter for realizing the quick sampling of the internal frequency to inverter power supply
Internal energy storage quickly changes the deviation control of diagonal frequencies.
Further, step 2 is further comprising the steps of: the complexity in order to reduce model, and controller selects synchronous generator
The second-order model of machine:
J is mechanical rotary inertia, TmFor the mechanical force moment of prime mover, TeFor the electromagnetic torque of generator, ω is actual corners speed
Degree, t is time, PTFor the mechanical output of generator, PeFor the electromagnetic power of generator, ωnFor rated speed；
When primary frequency modulation, inverter primary frequency modulation droop control device model is established:
PT=Pref+(f-fref)/δ
In formula, PrefRefer to and give with reference to mechanical output, f refers to real-time frequency, frefIt is given reference frequency, δ refers to
The difference coefficient of generating set；When inverse appliances power source system is stablized, difference 0, when net side disturbs, Δ Pe≠0；It examines
Consider electromagnetic power PeBe negative coefficient entry in equation of rotor motion, thus negative sign is taken before departure, establishes rotor motion side
Small-signal model under journey per unit value:
ΔPe=-(Pk-Pave),
In formula, Δ Pe refers to departure of the electromagnetic power in equation of rotor motion；PkRefer to real-time electromagnetic power；
PaveRefer to power average value；△ Pm refers to the variable quantity of mechanical output；Δ W is inner corners frequency variation；The mould of rotatory inertia
When quasi-, by Δ PeIt is sent into equation of rotor motion, internal angular frequency variation delta ω ' is sought in realization；Wherein, by PaveIt is equivalent
For electromagnetic power, during microvariations, after being linearized near stable operating point, it is believed that Δ Pm=0, and then can be with according to above formula
Calculate corresponding internal rotation/angular frequency variation.
Further, step 2 is further comprising the steps of: after inverter power supply system disturbs, phaselocked loop starts to examine
The real-time frequency for surveying inverter power supply, it is poor that the real-time frequency f of collected inverter power supply and rated frequency fn is made, and takes absolutely
To value compared with the threshold value of dead zone；When the absolute value of Δ f is greater than dead zone threshold value, primary frequency modulation controlling unit starts to act, and finds out
External angular frequency variation delta ω.
Further, step 3, by the inner corners frequency variation Δ ω ' and outside angular frequency variation delta in step 2
Phase bit instruction of the ω as inverter power supply output voltage, phase bit instruction will be used for the coordinate transform of inner ring.
Further, step 4: comprehensively considering voltage feed-forward control item and current feedback item, obtains desired output grid entry point
Reference voltage d axis component UmdWith q axis component Umq, become in conjunction with the anti-Park that phase bit instruction realizes dq coordinate to abc coordinate
It changes, is sent into PWM modulation later and generates control signal.
Further, step 5: by the ratio of the initial power of power deviation amount Δ Pe and inverter in step 2 into
Row amendment, as the amendment to step 4 voltage signal.
Further, it step 6: is obtained according to the exploitation of the frequency variation Δ f of inverter power supply and difference coefficient δ
To correspondingly active increment, the reference value Pref of photovoltaic output power changes at this time, by non-MPPT control adjustment power with
Track point increases or decreases output power to participate in the control of primary frequency modulation.
The simulation link of rotatory inertia is by equation of rotor motion by angular frequency inside rapid Estimation, while being made
For the phase bit instruction of inverter output voltage, which is used for the coordinate transform of inner ring.In addition, in current moment power and averagely
Power makees available power deviation amount Δ P after difference, after the ratio of itself and initial power is modified, thus as to voltage
The amendment of signal mainly provides energy outlet to internal energy-storage travelling wave tube, to complete energy since its action time is extremely short
Transmitting.
The port frequency of system is that internal frequency and foreign frequency are coefficient as a result, reducing wanting for sagging consistency
It asks；Foreign frequency refers to, primary frequency modulation controlling unit detects frequency by phaselocked loop, and according to the frequency variation detected into
The sagging control of row changes power output, and then adjusts frequency；Internal frequency refers to that the simulation link of rotatory inertia is instantaneous according to load
The departure of power and mean power carries out the foundation of energy conversion as internal energy-storage travelling wave tube, as Δ P < 0, under internal frequency
Drop, the energy-storage travelling wave tube inside inverter power supply discharges energy storage at this time；As Δ P > 0, internal frequency rises.
ΔPe=-(Pk-Pave) it with negative bracket is departure of the electromagnetic power in equation of rotor motion, therefore be mark
The state of value.
Dead zone threshold value just refers to that one value of self-defining is exactly the meaning of critical value as dead zone critical value, adjusts difference system
Number δ refers to the difference coefficient δ of (new energy) generating set.
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 (10)
1. a kind of inverter frequency modulation method of comprehensive rotatory inertia simulation and primary frequency modulation control, which is characterized in that primary frequency modulation
The real-time frequency that inverter power supply is detected by phaselocked loop, according to the frequency variation of the inverter power supply detected and set
The difference coefficient of generating set correspondingly change the power output of generating set, be active and reactive to control inverter by adjusting
The frequency of power supply and the voltage of inverter power supply, belong to sagging control；The simulation of rotatory inertia is by calculating inverter in real time
Feedback quantity of the electromagnetic power of power supply as control, and become using the frequency that equation of rotor motion calculates corresponding inverter power supply
Change amount, to realize the quick sampling to the internal frequency of inverter power supply；Therefore the simulation of rotatory inertia is to pass through inverter
Energy variation inside power-supply system controls the output frequency of inverter power supply, belongs to control of hanging down of falling down in itself.
2. the inverter frequency modulation method of a kind of comprehensive rotatory inertia simulation and primary frequency modulation control according to claim 1,
It is characterized in that, the simulation of rotatory inertia and the control of primary frequency modulation, are coordinated by setting primary frequency modulation dead zone；It is small when occurring
After disturbance, when the frequency of inverter power supply is changed in set primary frequency modulation dead zone, only rotatory inertia link is dynamic at this time
Make；After occurring compared with large disturbances, when the frequency variation of inverter power supply is beyond set primary frequency modulation dead zone, then rely primarily on
Primary frequency modulation is controlled；The simulation link of rotatory inertia all could be made that response inside and outside primary frequency modulation controlling dead error, with one
Secondary frequency modulation control link is unrelated whether movement.
3. the inverter frequency modulation method of a kind of comprehensive rotatory inertia simulation and primary frequency modulation control according to claim 2,
Characterized by comprising the following steps:
Step 1, after system disturbs, rotatory inertia simulation link starts to act, grid-connected by high speed and real time sampling first
The voltage and current signal of point PCC calculates the real-time electromagnetic power P of three phase mains in real timek:
Pk=uaia+ubib+ucic,
Wherein, ua、ub、ucThe respectively voltage of three phase mains, ia、ibAnd icRespectively ua、ub、uc；Corresponding electric current；To
To real-time electromagnetic power Pk, then the real-time electromagnetic power P that primary Calculation is obtainedkIt obtains stablizing output by low-pass filter
Real-time stabilization electromagnetic power Pk *；
In view of the electromagnetic power P of the three phase mains of actual measurementeWaveform there are random fluctuations, in order to inhibit random fluctuation
It influences, by calculating n real-time stabilization electromagnetic power P before the moment in real timek *Obtain power average value PaveAs digital filtering
Device, by power average value PaveWith real-time stabilization electromagnetic power Pk *Δ P is calculated to obtain as differencee；Wherein, real-time stabilization electromagnetic power Pk *
With the average value P of preceding n poweraveCalculation formula it is as follows:
Step 2 defines electromagnetic power amount of unbalance according to the small-signal model under equation of rotor motion per unit value are as follows:
ΔPe=-(Pk-Pave)
As Δ Pe < 0, the energy-storage travelling wave tube of inverter internal absorbs excess energy, rises along with frequency；It is inverse as Δ Pe > 0
The energy-storage travelling wave tube become inside device should discharge energy storage.
4. the inverter frequency modulation method of a kind of comprehensive rotatory inertia simulation and primary frequency modulation control according to claim 3,
It is characterized in that, the simulation of rotatory inertia and the control of primary frequency modulation all consider the internal frequency characteristic of inverter power supply,
Equation of rotor motion has all been used, the relevance of control strategy is strengthened；The simulation of rotatory inertia and the control zone of primary frequency modulation
It is not, equation of rotor motion carries out the frequency control of power versus frequency response in the control of primary frequency modulation；And in rotatory inertia
In simulation, equation of rotor motion carries out inverter internal for for realizing the quick sampling of the internal frequency to inverter power supply
Energy storage quickly changes the deviation control of diagonal frequencies.
5. the inverter frequency modulation method of a kind of comprehensive rotatory inertia simulation and primary frequency modulation control according to claim 1,
It is characterized in that, step 2 is further comprising the steps of: the complexity in order to reduce model, controller select the two of synchronous generator
Rank model:
J is mechanical rotary inertia, TmFor the mechanical force moment of prime mover, TeFor the electromagnetic torque of generator, ω is actual angular speed, t
For time, PTFor the mechanical output of generator, PeFor the electromagnetic power of generator, ωnFor rated speed；
When primary frequency modulation, inverter primary frequency modulation droop control device model is established:
PT=Pref+(f-fref)/δ
In formula, PrefRefer to and give with reference to mechanical output, f refers to real-time frequency, frefIt is given reference frequency, δ refers to power generation
The difference coefficient of unit；When inverse appliances power source system is stablized, difference 0, when net side disturbs, Δ Pe≠0；It considers
Electromagnetic power PeBe negative coefficient entry in equation of rotor motion, thus negative sign is taken before departure, establishes equation of rotor motion mark
Small-signal model under value:
ΔPe=-(Pk-Pave),
In formula, Δ Pe refers to departure of the electromagnetic power in equation of rotor motion；PkRefer to real-time electromagnetic power；PaveRefer to
Power average value；△ Pm refers to the variable quantity of mechanical output；Δ W is inner corners frequency variation；It, will when the simulation of rotatory inertia
ΔPeIt is sent into equation of rotor motion, internal angular frequency variation delta ω ' is sought in realization；Wherein, by PaveIt is equivalent to electromagnetic work
Rate, during microvariations, after being linearized near stable operating point, it is believed that Δ Pm=0, and then phase can be calculated according to above formula
The internal rotation answered/angular frequency variation.
6. the inverter frequency modulation method of a kind of comprehensive rotatory inertia simulation and primary frequency modulation control according to claim 5,
It is characterized in that, step 2 is further comprising the steps of: after inverter power supply system disturbs, phaselocked loop starts to detect inversion
The real-time frequency of device power supply, it is poor that the real-time frequency f of collected inverter power supply and rated frequency fn are made, and take absolute value and
Dead zone threshold value is compared；When the absolute value of Δ f is greater than dead zone threshold value, primary frequency modulation controlling unit starts to act, and finds out external angle
Frequency variation Δ ω.
7. the inverter frequency modulation method of a kind of comprehensive rotatory inertia simulation and primary frequency modulation control according to claim 6,
It is characterized in that, step 3, using in step 2 inner corners frequency variation Δ ω ' and outside angular frequency variation delta ω as
The phase bit instruction of inverter power supply output voltage, phase bit instruction will be used for the coordinate transform of inner ring.
8. the inverter frequency modulation method of a kind of comprehensive rotatory inertia simulation and primary frequency modulation control according to claim 1,
It is characterized in that, step 4: comprehensively considering voltage feed-forward control item and current feedback item, obtain the reference of desired output grid entry point
The d axis component U of voltagemdWith q axis component Umq, converted in conjunction with the anti-Park that phase bit instruction realizes dq coordinate to abc coordinate, later
It is sent into PWM modulation and generates control signal.
9. the inverter frequency modulation method of a kind of comprehensive rotatory inertia simulation and primary frequency modulation control according to claim 1,
It is characterized in that, step 5: the ratio of the initial power of power deviation amount Δ Pe and inverter in step 2 is modified,
As the amendment to step 4 voltage signal.
10. the inverter frequency modulation method of a kind of comprehensive rotatory inertia simulation and primary frequency modulation control according to claim 1,
It is characterized in that, step 6: being obtained accordingly according to the exploitation of the frequency variation Δ f of inverter power supply and difference coefficient δ
The active increment in ground, the reference value Pref of photovoltaic output power changes at this time, controls adjustment power tracking point by non-MPPT, i.e.,
Output power is increased or decreased to participate in the control of primary frequency modulation.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112421658A (en) * | 2020-10-20 | 2021-02-26 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Inertia link control method of energy storage inverter in emergency microgrid scene |
| CN113162122A (en) * | 2021-02-26 | 2021-07-23 | 华中科技大学 | Virtual synchronous machine control method and system based on consistency algorithm |
| CN113991704A (en) * | 2021-11-01 | 2022-01-28 | 国网天津市电力公司 | Method and device for identifying inertia and primary frequency modulation parameters based on synchronous generator set |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112421658A (en) * | 2020-10-20 | 2021-02-26 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Inertia link control method of energy storage inverter in emergency microgrid scene |
| CN113162122A (en) * | 2021-02-26 | 2021-07-23 | 华中科技大学 | Virtual synchronous machine control method and system based on consistency algorithm |
| CN113162122B (en) * | 2021-02-26 | 2022-08-02 | 华中科技大学 | Virtual synchronous machine control method and system based on consistency algorithm |
| US20230031575A1 (en) * | 2021-07-29 | 2023-02-02 | General Electric Company | System and method for power control of an inverter-based resource with a grid-forming converter |
| US11715958B2 (en) * | 2021-07-29 | 2023-08-01 | General Electric Company | System and method for power control of an inverter-based resource with a grid-forming converter |
| CN113991704A (en) * | 2021-11-01 | 2022-01-28 | 国网天津市电力公司 | Method and device for identifying inertia and primary frequency modulation parameters based on synchronous generator set |
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| CN110323763B (en) | 2022-09-16 |
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