CN107147127A - A kind of wind power generating set distributing accesses a pressure regulation method - Google Patents
A kind of wind power generating set distributing accesses a pressure regulation method Download PDFInfo
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- CN107147127A CN107147127A CN201710402888.5A CN201710402888A CN107147127A CN 107147127 A CN107147127 A CN 107147127A CN 201710402888 A CN201710402888 A CN 201710402888A CN 107147127 A CN107147127 A CN 107147127A
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- 230000033228 biological regulation Effects 0.000 title claims abstract description 10
- 238000004364 calculation method Methods 0.000 claims description 26
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Classifications
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- H02J3/386—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
A pressure regulation method, including step are accessed the invention discloses a kind of wind power generating set distributing：1) data acquisition；2) collection period judges；3) data are calculated；4) FVRT actions judge；5) voltage deviation is calculated；6) output reactive power is calculated；7) idle amplitude limit is exported to calculate；8) instruction issues current transformer execution；9) reactive power instruction locking.Using the inventive method can solve machine net reactance after the access of Large-scale Wind Turbines distributing it is big, apart from power supply it is remote and apart from the control difficulty that load is closely brought it is big the problem of, the voltage stabilization of grid entry point after the access of wind power generating set distributing can be effectively improved, is conducive to the popularization of large-scale half directly-drive permanent magnet synchro wind generator group distributing access.
Description
Technical field
The present invention relates to the technical field of the access of wind-power electricity generation distributing and pressure regulation of wind-power electricity generation, one kind is referred in particular to
Wind power generating set distributing accesses a pressure regulation method.
Background technology
Large-scale half directly-drive permanent magnet synchro wind generator group, critical piece include gear-box, middling speed magneto alternator,
Blade, tower, full power convertor.Requirement with country to wind electricity digestion capability is progressively strengthened, Large-scale Wind Turbines
Distributing access will turn into an important developing direction.However, the access of Large-scale Wind Turbines distributing is different from biography
The centralized access scheme of system, it is mainly characterized in that：Remote and near apart from load apart from power supply, the reactance of machine net is big, accesses network load
Access exit fluctuation with wind power etc. and will all largely effect on access point voltage stabilization.But distributing access is not equipped with steady
Determine the auto-reactive compensation equipment of system voltage, therefore it accesses the stability contorting difficulty of power network greatly, also have impact on large scale wind
The popularization of generating set distributing access.
At present, large-scale half directly-drive permanent magnet synchro wind generator group (hereinafter referred to as blower fan) is due to using total power unsteady flow
Device, may operate in the range of power factor -0.95 (perception)~0.95 (capacitive), possesses stronger reactive power capability.But wind-force
Pressure regulation associated control logic of access point is not directed in generator set control algorithm, unit only operates in firm power factor
Or constant reactive power pattern.Access point voltage level can not be controlled, is large-scale half directly-drive permanent magnet synchro wind generator component
Dissipate formula access popularization and form resistance.
The content of the invention
It is an object of the invention to the shortcoming and deficiency for overcoming prior art, there is provided a kind of wind power generating set distributing
A pressure regulation method is accessed, for controlling grid entry point Voltage-stabilizing Problems after solving the access of wind power generating set distributing, is used
It is big, remote and near apart from load apart from power supply that the inventive method can solve machine net reactance after the access of Large-scale Wind Turbines distributing
The problem of control difficulty brought is big, can effectively improve the voltage stabilization of grid entry point after the access of wind power generating set distributing,
Be conducive to the popularization of large-scale half directly-drive permanent magnet synchro wind generator group distributing access.
To achieve the above object, technical scheme provided by the present invention is：A kind of wind power generating set distributing access one
Secondary pressure regulation method, this method is to first pass through collection blower fan grid entry point three-phase current and three-phase voltage instantaneous value, then calculates blower fan
Grid entry point average voltage and grid-connected total reactive power, recycle setting voltage to be calculated with grid-connected average voltage deviations value Δ U and ask for
Set reactive power Qn+1, last amplitude limit obtain issue reactive power Q 'n+1, issue current transformer execution；Its step process is as follows：
1) data acquisition
Fan master control system utilizes PLC module collection blower fan grid entry point three-phase voltage instantaneous value (ua(t)、ub(t)、uc(t)) and
Three-phase current instantaneous value (ia(t)、ib(t)、ic(t)), and by data storage to register, concrete condition is as follows：
Three-phase current instantaneous value electric current is to access PLC again after primary side current is converted into 1A or 5A using current transformer
Module, and the sub-value i that converts back in conversion softwarea(t)、ib(t)、ic(t)Store again to register afterwards, if PLC module is without inside
Current divider, then by the way of parallel resistance in the loop；
The instantaneous threshold voltage of three-phase voltage is that grid entry point three-phase voltage is directly accessed into PLC acquisition modules, and is stored to deposit
Device, if the voltage range of PLC module can not meet directly collection and require, needs access voltage transformer to be transferred, by voltage
Available range is gone to be acquired, and the sub-value u that converts back in conversion softwarea(t)、ub(t)、uc(t)Store again afterwards to register；
2) collection period judges
Judge whether data acquisition time reaches setting collection period TkIf reaching and skipping to step 3), if not up to if after
Continuous circulation previous step 2) data acquisition；Wherein collection period Tk=λ T, λ are data window cycle, T be system per cycle when
Between, 50Hz systems are per the cycle time60Hz systems are per the cycle timeData window cycle λ is pushed away
Recommend 1/2 integer multiple, if selection one is not the random number of 1/2 multiple, and less than 5, then measured value is by big amplitude wave
It is dynamic, λ >=2.5 in 50Hz power system, and in 60Hz power system λ >=3；
3) data are calculated
Calculate in TkThree-phase voltage virtual value (U in the time sampling cyclea、Ub、Uc), three-phase current virtual value (Ia、Ib、
Ic) and the total reactive power Q of three-phasen, in TkData window length n=n in the time sampling cycle1* n in λ, formula1For in a cycle
The data points of sampling, 50Hz systems n1=fs/ 50,60Hz systems n1=fs/ 60, fsFor frequency acquisition；Enter after the completion of calculating
Step 4), wherein detailed calculating process is as follows：
3.1) grid entry point voltage effective value (U is calculateda、Ub、Uc), calculation formula is as follows：
In formula, u(t)For single-phase instantaneous voltage value, U is single-phase voltage virtual value, and n is data window length；
3.2) grid entry point current effective value (I is calculateda、Ib、Ic), calculation formula is as follows：
In formula, i(t)For single-phase instantaneous current value, I is monophase current virtual value, and n is data window length；
3.3) the single-phase active power (P of grid entry point is calculateda、Pb、Pc), calculation formula is as follows：
In formula, P is single-phase active power, and n is data window length, u(t)For single-phase instantaneous voltage value, i(t)To be single-phase instantaneous
Current value；
3.4) the single-phase apparent energy (S of grid entry point is calculateda、Sb、Sc), calculation formula is as follows：
S=UI
In formula, S is single-phase apparent energy, and U is single-phase voltage virtual value, and I is monophase current virtual value；
3.5) the single-phase reactive power (Q of grid entry point is calculateda、Qb、Qc), calculation formula is as follows：
In formula, Q is single-phase reactive power, and S is single-phase apparent energy, and P is single-phase active power；
3.6) the total reactive power Q of three-phase is calculatedn, calculation formula is as follows：
Qn=Qa+Qb+Qc
In formula, QaFor A phase reactive powers, QbFor B phase reactive powers, QcFor C phase reactive powers；
4) FVRT actions judge
The FVRT actuating signals that PLC module receives current transformer feedback using communication are BOOL variables, if FVRT actuating signals
Triggering, then illustrate that unit is in FVRT states, into step 9), if FVRT actuating signals are not triggered, illustrate that unit is not in
FVRT states, into step 5)；Wherein, current transformer reactive power value during FVRT is acted is not instructed by master control controls,
Voluntarily according to output reactive power is required during FVRT, current transformer cancels FVRT operating states after FVRT releases, simultaneously
Again master control reactive command is received, current transformer is idle by master control control；
5) voltage deviation is calculated
Calculating voltage deviation value Δ U is used for step 6) idle output reactive power calculating, calculate and complete to enter step 6), meter
Calculation method is as follows：
Δ U=Uref-U′
In formula, UrefFor control point target voltage values, 0.9~1.1 times of U is taken0；The different voltage class U of correspondence0Value is not
Together：Voltage class 0.38,0.62,0.66,1,1.14,2.3,3,6,10 corresponding U0Value be 0.4,0.62,0.69,1.05,
1.2、2.4、3.15、6.3、10.5；
The computational methods of U ' phase voltage virtual values are as follows：
Method 1：Take the average value of three-phase voltage virtual value
Method 2:Weighted value is taken, the average value of three-phase maximum and three-phase minimum value is taken
6) output reactive power is calculated
Reactive power Q is calculated according to voltage deviation value Δ Un+1, step 7 is carried out after the completion of calculating), calculating process is as follows：
As-A≤Δ U≤A, Qn+1=Qn；
As-B≤Δ U ＜-A, Qn+1=Qn-ΔQ；
As B >=Δ U ＞ A；,Qn+1=Qn+ΔQ；
As-B ＞ Δ U, Δ U ＞ B,
Wherein, A, B, Δ Q are threshold value, need to be designed according to real system parameter, and overall goal is stable to meet system；
Threshold value Δ Q recommendations are Δ Q=6%P, and P is blower fan active power rated value；SscFor blower fan access point capacity of short circuit, basis is needed
Specific access system is set；
7) export idle amplitude limit to calculate, calculation formula is as follows：
Q′n+1=limit (Qmax, Qn+1, Qmin)
In formula, Q 'n+1For the amplitude limit of reactive power, amplitude limit value can be run in the range of reactive power in unit capacity, QmaxFor
Unit maximum capacitive reactive power, QminFor unit maximum inductive reactive power；
8) instruction issues current transformer execution
By Q 'n+1Value is issued to current transformer, and current transformer is according to Q 'n+1Idle output is carried out to be adjusted so that and network reactive power
Reach Q 'n+1；
9) reactive power instruction locking
Locking reactive command is calculated, and takes Qn+1=Qn, carry out step 7).
The present invention compared with prior art, has the following advantages that and beneficial effect：
1st, unit it is grid-connected send active power while can compensation system reactive power, with ballast system voltage, optimization
Blower fan access is stable, while the stability that the certain dead band threshold value of consideration and magnitude of voltage sampling are calculated, is requiring cycle and dead band
Reactive power is not adjusted in threshold value, using fixed small step compensations when low voltage is fluctuated, to avoid too fast regulating system voltage
Cause system unstable.
2nd, calculated for significantly voltage pulsation using idle output valve according to reactive requirement value, quick response can be met
It is required that, while considering FRT processes, quick response can be carried out for failure while the system that meets is stable.
Brief description of the drawings
Fig. 1 is the inventive method flow chart.
Fig. 2 is the Organization Chart of data acquisition.
Fig. 3 is the Organization Chart of parallel resistance data acquisition.
Fig. 4 is that threshold values judges and output reactive power calculation flow chart.
Embodiment
With reference to specific embodiment, the invention will be further described.
It is shown in Figure 1, the wind power generating set distributing pressure regulation method of access that the present embodiment is provided, including with
Lower step：
1) data acquisition
Fan master control system utilizes PLC module collection blower fan grid entry point three-phase voltage instantaneous value (ua(t)、ub(t)、uc(t)) and
Three-phase current instantaneous value (ia(t)、ib(t)、ic(t)), and by data storage to register.Wherein, three-phase current instantaneous value electric current is
Primary side current is converted to using current transformer and accesses PLC module after 1A or 5A again, and converts back in conversion software one
Sub-value ia(t)、ib(t)、ic(t)Store again to register afterwards, it is shown in Figure 2.If PLC module is without internal shunt device, it can use
The mode of parallel resistance, shown in Figure 3 in loop.And the instantaneous threshold voltage of three-phase voltage is directly to connect grid entry point three-phase voltage
Enter PLC module, and store to register.If PLC module voltage range can not meet directly collection and require, mutual induction of voltage can access
Device is transferred, and voltage is gone into available range is acquired, and the sub-value u that converts back in software for calculationa(t)、ub(t)、
uc(t), and store to register.
2) collection period judges
Judge whether data acquisition time reaches setting collection period TkIf reaching and skipping to step 3), if not up to if after
Continuous circulation previous step 2) data acquisition.Wherein collection period Tk=λ T, λ are data window cycle, T be system per cycle when
Between, 50Hz systems are per the cycle time60Hz systems are per the cycle timeData window cycle λ recommends
1/2 integer multiple, if selection one is not the random number of 1/2 multiple, and less than 5, then measured value is by fluctuation.
λ >=2.5 in 50Hz power system, and λ >=3 in 60Hz power system.Experience have shown that, this is measuring speed and stably
Property between one well compromise.Only this value can be just changed under special circumstances (for example, high measurement is fast
Degree, low-signal frequencies or specific current curve).
3) data are calculated
Calculate in TkThree-phase voltage virtual value (U in the time sampling cyclea、Ub、Uc), three-phase current virtual value (Ia、Ib、
Ic) and the total reactive power Q of three-phasen, in TkData window length n=n in the time sampling cycle1* n in λ, formula1For in a cycle
The data points of sampling, 50Hz systems n1=fs/ 50,60Hz systems n1=fs/ 60, fsFor frequency acquisition, it is proposed that fs≥1000Hz；
Enter step 4 after the completion of calculating), wherein detailed calculating process is as follows：
3.1) grid entry point voltage effective value (U is calculateda、Ub、Uc), with A phase voltage virtual values UaExemplified by calculation formula it is as follows：
ua(t)-- A phase instantaneous voltage values；
Ua-- A phase voltage virtual values；
N-- data window length；
3.2) grid entry point current effective value (I is calculateda、Ib、Ic), with A phase current virtual values IaExemplified by calculation formula it is as follows：
ia(t)-- A phase instantaneous current values；
Ia-- A phase voltage virtual values；
N-- data window length；
3.3) the single-phase active power (P of grid entry point is calculateda、Pb、Pc), with A phase active-power PsaExemplified by calculation formula it is as follows：
Pa-- A phase active power；
N-- data window length；
ua(t)-- A phase instantaneous voltage values；
ia(t)-- A phase instantaneous current values；
3.4) the single-phase apparent energy (S of grid entry point is calculateda、Sb、Sc), with A phase apparent energy SaExemplified by calculation formula it is as follows：
Sa=Ua·Ia
Ua-- A phase voltage virtual values；
Ia-- A phase current virtual values；
3.5) the single-phase reactive power (Q of grid entry point is calculateda、Qb、Qc), with A phase reactive power QsaExemplified by calculation formula it is as follows：
Sa-- apparent energy value；
Pa-- active power value；
3.6) the total reactive power Q of three-phase is calculatedn, calculation formula is as follows：
Qn=Qa+Qb+Qc
Qa-- A phase reactive powers；
Qb-- B phase reactive powers；
Qc-- C phase reactive powers.
4) FVRT actions judge
PLC module receives the FVRT actuating signals (BOOL variables) of current transformer feedback using communication.If FVRT actuating signals
Triggering, then illustrate that unit is in FVRT states, into step 9)；If FVRT actuating signals are not triggered, illustrate that unit is not in
FVRT states, into step 5).
Current transformer reactive power value during FVRT is acted is not instructed by master control to be controlled, and voluntarily requires defeated according to during FVRT
Go out reactive power.Current transformer cancels FVRT operating states after FVRT releases, while receiving master control reactive command again, becomes
Flow device idle by master control control.
5) voltage deviation is calculated
Calculating voltage deviation value Δ U is used for step 6) idle output reactive power calculating, calculate and complete to enter step 6), meter
Calculation method is as follows：
In formula, UrefFor control point target voltage values, 0.9~1.1 times of U is taken0；The different voltage class U of correspondence0Value is not
Together, referring to shown in table 1 below.
The voltage class of table 1 correspondence U0Value
| Voltage class | 0.38 | 0.62 | 0.66 | 1 | 1.14 |
| U0Value | 0.4 | 0.62 | 0.69 | 1.05 | 1.2 |
| Voltage class | 2.3 | 3 | 6 | 10 | |
| U0Value | 2.4 | 3.15 | 6.3 | 10.5 |
The computational methods of U ' phase voltage virtual values are as follows：
Method 1：Take the average value of three-phase voltage virtual value
Method 2:Weighted value is taken, the average value of three-phase maximum and three-phase minimum value is taken
6) output reactive power is calculated
Reactive power Q is calculated according to voltage deviation value Δ Un+1, step 7 is carried out after the completion of calculating), shown in Figure 4, meter
Calculation process is as follows：
As-A≤Δ U≤A, Qn+1=Qn；
As-B≤Δ U ＜-A, Qn+1=Qn-ΔQ；
As B >=Δ U ＞ A；,Qn+1=Qn+ΔQ；
As-B ＞ Δ U, Δ U ＞ B,
Wherein, A, B, Δ Q are threshold value, need to be designed according to real system parameter, and overall goal is stable to meet system,
By taking 690V systems as an example, threshold value A recommendation is 5, and threshold value B recommendations are 20；Threshold value Δ Q recommendations are that Δ Q=6%P, P are wind
Machine active power rated value；SscFor blower fan access point capacity of short circuit, it need to be set according to specific access system.
7) export idle amplitude limit to calculate, calculation formula is as follows：
Q′n+1=limit (Qmax, Qn+1, Qmin)
In formula, Q 'n+1For the amplitude limit of reactive power, amplitude limit value can be run in the range of reactive power in unit capacity, QmaxFor
Unit maximum capacitive reactive power, QminFor unit maximum inductive reactive power.
8) instruction issues current transformer execution
By Q 'n+1Value is issued to current transformer, and current transformer is according to Q 'n+1Idle output is carried out to be adjusted so that and network reactive power
Reach Q 'n+1。
9) reactive power instruction locking
Locking reactive command is calculated, and takes Qn+1=Qn, carry out step 7).
Using after above scheme, compared with prior art, unit it is grid-connected send active power while can compensate and be
System reactive power, with ballast system voltage, optimization blower fan access is stable.Simultaneously, it is considered to which certain dead band threshold value and magnitude of voltage are adopted
The stability that sample is calculated, reactive power is not adjusted within the cycle that requires and dead band threshold value, small using fixation when low voltage is fluctuated
Step compensations, to avoid too fast regulating system voltage from causing system unstable.And use idle output for significantly voltage pulsation
Value is calculated according to reactive requirement value, can meet quick response requirement.FRT processes are considered simultaneously, can be to meet system steady
While determining, quick response is carried out for failure.In a word, Large-scale Wind Turbines distributing can be solved using the inventive method
After access the reactance of machine net it is big, apart from power supply it is remote and apart from the control difficulty that load is closely brought it is big the problem of, wind can be effectively improved
The voltage stabilization of grid entry point, is conducive to large-scale half directly-drive permanent magnet synchro wind generator component after the access of power generator group distributing
The popularization of formula access is dissipated, with actual application value, is worthy to be popularized.
Examples of implementation described above are only the preferred embodiments of the invention, and the implementation model of the present invention is not limited with this
Enclose, therefore the change that all shape, principles according to the present invention are made, it all should cover within the scope of the present invention.
Claims (1)
1. a kind of wind power generating set distributing accesses a pressure regulation method, it is characterised in that this method is to first pass through collection wind
Machine grid entry point three-phase current and three-phase voltage instantaneous value, then calculate blower fan grid entry point average voltage and grid-connected total reactive power,
Recycle setting voltage to calculate with grid-connected average voltage deviations value Δ U to ask for setting reactive power Qn+1, last amplitude limit issued
Reactive power Q 'n+1, issue current transformer execution；Its step process is as follows：
1) data acquisition
Fan master control system utilizes PLC module collection blower fan grid entry point three-phase voltage instantaneous value (ua(t)、ub(t)、uc(t)) and three-phase
Current instantaneous value (ia(t)、ib(t)、ic(t)), and by data storage to register, concrete condition is as follows：
Three-phase current instantaneous value electric current is to be converted to primary side current using current transformer to access PLC moulds after 1A or 5A again
Block, and the sub-value i that converts back in conversion softwarea(t)、ib(t)、ic(t)Store again to register afterwards, if PLC module is without interior part
Device is flowed, then by the way of parallel resistance in the loop；
The instantaneous threshold voltage of three-phase voltage is that grid entry point three-phase voltage is directly accessed into PLC acquisition modules, and is stored to register, if
The voltage range of PLC module can not meet directly collection and require, then needs access voltage transformer to be transferred, voltage is gone to can
It is acquired with range, and the sub-value u that converts back in conversion softwarea(t)、ub(t)、uc(t)Store again afterwards to register；
2) collection period judges
Judge whether data acquisition time reaches setting collection period TkIf reaching and skipping to step 3), continued cycling through if not up to
Previous step 2) data acquisition；Wherein collection period Tk=λ T, λ are data window cycle, and T is system every cycle time,
50Hz systems are per the cycle time60Hz systems are per the cycle timeData window cycle λ recommends 1/
2 integer multiple, if selection one is not the random number of 1/2 multiple, and less than 5, then measured value by fluctuation,
λ >=2.5 in 50Hz power system, and λ >=3 in 60Hz power system；
3) data are calculated
Calculate in TkThree-phase voltage virtual value (U in the time sampling cyclea、Ub、Uc), three-phase current virtual value (Ia、Ib、Ic) with
And the total reactive power Q of three-phasen, in TkData window length n=n in the time sampling cycle1* n in λ, formula1To be sampled in a cycle
Data points, 50Hz systems n1=fs/ 50,60Hz systems n1=fs/ 60, fsFor frequency acquisition；Enter step after the completion of calculating
4), wherein detailed calculating process is as follows：
3.1) grid entry point voltage effective value (U is calculateda、Ub、Uc), calculation formula is as follows：
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In formula, u(t)For single-phase instantaneous voltage value, U is single-phase voltage virtual value, and n is data window length；
3.2) grid entry point current effective value (I is calculateda、Ib、Ic), calculation formula is as follows：
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In formula, i(t)For single-phase instantaneous current value, I is monophase current virtual value, and n is data window length；
3.3) the single-phase active power (P of grid entry point is calculateda、Pb、Pc), calculation formula is as follows：
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</msub>
</mrow>
In formula, P is single-phase active power, and n is data window length, u(t)For single-phase instantaneous voltage value, i(t)For single-phase transient current
Value；
3.4) the single-phase apparent energy (S of grid entry point is calculateda、Sb、Sc), calculation formula is as follows：
S=UI
In formula, S is single-phase apparent energy, and U is single-phase voltage virtual value, and I is monophase current virtual value；
3.5) the single-phase reactive power (Q of grid entry point is calculateda、Qb、Qc), calculation formula is as follows：
<mrow>
<mi>Q</mi>
<mo>=</mo>
<msqrt>
<mrow>
<msup>
<mi>S</mi>
<mn>2</mn>
</msup>
<mo>-</mo>
<msup>
<mi>P</mi>
<mn>2</mn>
</msup>
</mrow>
</msqrt>
</mrow>
In formula, Q is single-phase reactive power, and S is single-phase apparent energy, and P is single-phase active power；
3.6) the total reactive power Q of three-phase is calculatedn, calculation formula is as follows：
Qn=Qa+Qb+Qc
In formula, QaFor A phase reactive powers, QbFor B phase reactive powers, QcFor C phase reactive powers；
4) FVRT actions judge
The FVRT actuating signals that PLC module receives current transformer feedback using communication are BOOL variables, if FVRT actuating signals are triggered,
Then illustrate that unit is in FVRT states, into step 9), if FVRT actuating signals are not triggered, illustrate that unit is not in FVRT shapes
State, into step 5)；Wherein, current transformer reactive power value during FVRT is acted is not instructed by master control controls, voluntarily root
Output reactive power is required during according to FVRT, current transformer cancels FVRT operating states after FVRT releases, while connecing again
Master control reactive command is received, current transformer is idle by master control control；
5) voltage deviation is calculated
Calculating voltage deviation value Δ U is used for step 6) idle output reactive power calculating, calculate and complete to enter step 6), calculating side
Method is as follows：
Δ U=Uref-U′
In formula, UrefFor control point target voltage values, 0.9~1.1 times of U is taken0；The different voltage class U of correspondence0Value is different：Electricity
Press grade 0.38,0.62,0.66,1,1.14,2.3,3,6,10 corresponding U0Value be 0.4,0.62,0.69,1.05,1.2,
2.4、3.15、6.3、10.5；
The computational methods of U ' phase voltage virtual values are as follows：
Method 1：Take the average value of three-phase voltage virtual value
<mrow>
<msup>
<mi>U</mi>
<mo>&prime;</mo>
</msup>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>U</mi>
<mi>a</mi>
</msub>
<mo>+</mo>
<msub>
<mi>U</mi>
<mi>b</mi>
</msub>
<mo>+</mo>
<msub>
<mi>U</mi>
<mi>c</mi>
</msub>
</mrow>
<msqrt>
<mn>3</mn>
</msqrt>
</mfrac>
</mrow>
Method 2:Weighted value is taken, the average value of three-phase maximum and three-phase minimum value is taken
<mrow>
<msup>
<mi>U</mi>
<mo>&prime;</mo>
</msup>
<mo>=</mo>
<msqrt>
<mn>3</mn>
</msqrt>
<mo>*</mo>
<mo>&lsqb;</mo>
<mfrac>
<mrow>
<mi>m</mi>
<mi>a</mi>
<mi>x</mi>
<mrow>
<mo>(</mo>
<msub>
<mi>U</mi>
<mi>a</mi>
</msub>
<mo>,</mo>
<msub>
<mi>U</mi>
<mi>b</mi>
</msub>
<mo>,</mo>
<msub>
<mi>U</mi>
<mi>c</mi>
</msub>
<mo>)</mo>
</mrow>
<mo>+</mo>
<mi>m</mi>
<mi>i</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<msub>
<mi>U</mi>
<mi>a</mi>
</msub>
<mo>,</mo>
<msub>
<mi>U</mi>
<mi>b</mi>
</msub>
<mo>,</mo>
<msub>
<mi>U</mi>
<mi>c</mi>
</msub>
<mo>)</mo>
</mrow>
</mrow>
<mn>2</mn>
</mfrac>
<mo>&rsqb;</mo>
<mo>;</mo>
</mrow>
6) output reactive power is calculated
Reactive power Q is calculated according to voltage deviation value Δ Un+1, step 7 is carried out after the completion of calculating), calculating process is as follows：
As-A≤Δ U≤A, Qn+1=Qn；
As-B≤Δ U ＜-A, Qn+1=Qn-ΔQ；
As B >=Δ U ＞ A；,Qn+1=Qn+ΔQ；
As-B ＞ Δ U, Δ U ＞ B,
Wherein, A, B, Δ Q are threshold value, need to be designed according to real system parameter, and overall goal is stable to meet system；Threshold value
Δ Q recommendations are Δ Q=6%P, and P is blower fan active power rated value；SscFor blower fan access point capacity of short circuit, need according to specific
Access system is set；
7) export idle amplitude limit to calculate, calculation formula is as follows：
Q′n+1=limit (Qmax, Qn+1, Qmin)
In formula, Q 'n+1For the amplitude limit of reactive power, amplitude limit value can be run in the range of reactive power in unit capacity, QmaxFor unit
Maximum capacitive reactive power, QminFor unit maximum inductive reactive power；
8) instruction issues current transformer execution
By Q 'n+1Value is issued to current transformer, and current transformer is according to Q 'n+1Output that progress is idle is adjusted so that and network reactive power reaches
Q′n+1；
9) reactive power instruction locking
Locking reactive command is calculated, and takes Qn+1=Qn, carry out step 7).
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| CN103730908A (en) * | 2013-10-30 | 2014-04-16 | 国家电网公司 | Method for controlling energy storage converters in large-scale off-grid micro-grid |
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| CN103730908A (en) * | 2013-10-30 | 2014-04-16 | 国家电网公司 | Method for controlling energy storage converters in large-scale off-grid micro-grid |
| CN106329549A (en) * | 2016-09-05 | 2017-01-11 | 华北电力大学 | VSC (Voltage Source Converter)-HVDC (High Voltage Direct Current Transmission) system class synchronization machine controller design method |
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