CN106208059B - Adjustable impedance formula distributed photovoltaic power generation cluster resonance inhibiting system and suppressing method - Google Patents
Adjustable impedance formula distributed photovoltaic power generation cluster resonance inhibiting system and suppressing method Download PDFInfo
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- 238000010248 power generation Methods 0.000 title claims abstract description 37
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- 230000005764 inhibitory process Effects 0.000 abstract description 11
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- 230000006855 networking Effects 0.000 description 10
- 238000013016 damping Methods 0.000 description 5
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
- Y02E40/40—Arrangements for reducing harmonics
Abstract
A kind of adjustable impedance formula distributed photovoltaic power generation cluster resonance inhibiting system and suppressing method, system includes to be connected in parallel on points of common connection by system busbar and distributed photovoltaic power generation cluster respectively, and with distributed photovoltaic power generation cluster commonly through distribution network line equivalent inductance LgIt is incorporated to the central control unit of power distribution network, resonance inhibits unit and Reactive-power control unit, the signal input part of the signal output end connection central control unit of Reactive-power control unit, the signal output end of the signal input part connection central control unit of Reactive-power control unit, resonance inhibit the signal output end of the signal input part connection central control unit of unit.Method is when central control unit detects that resonance occurs for system, and resonance inhibits the reactor group in unit to circuit sequentially switching since intergrade, until the parallel resonance of system is inhibited.The present invention effectively realizes the inhibition to distributed photovoltaic power generation group system resonance on the basis of not changing original photovoltaic DC-to-AC converter control algolithm.
Description
Technical field
The present invention relates to a kind of photovoltaic power generation cluster resonance suppressing methods.It is distributed more particularly to a kind of adjustable impedance formula
Photovoltaic power generation cluster resonance inhibiting system and suppressing method.
Background technique
In recent years, China's distributed photovoltaic shows develops in flakes, the grid-connected feature of cluster.The fluctuation of photovoltaic power generation,
The characteristics of intermittence, randomness, so that the output of photovoltaic group system includes the voltage and current of harmonic spectrum abundant.Meanwhile
There are a large amount of LCL filters in distributed photovoltaic power generation group system, constitute complicated high-order electric network with distribution impedance, make
There are a large amount of natural resonance points for photovoltaic group system.Therefore, when distributed photovoltaic power generation cluster networking system voltage electric current is humorous
When wave frequency rate and the system natural resonance dot frequency match, resonance will occur.The control that resonance problems will affect inverter is returned
Road, the problems such as causing grid-connected photovoltaic system unstability, in the current existing grid-connected engineering of distributed photovoltaic, have occurred a lot of
Inverter parallel generates the case that resonance causes grid-connected failure even to damage grid-connection device, it is therefore necessary to which research is suitable
The resonance problems of scheme inhibition photovoltaic cluster grid-connected system.
The inhibition of inverter parallel resonance is mainly using the method for the active dampings such as virtual impedance, by increasing system damping
System resonance peak is inhibited.However, above-mentioned active damping method is focused on from the resonance inhibition of single inverter, and it is real
Inverter is often parallel running in border, and between inverter and inverter, there is the humorous of complexity between inverter and power grid
Shake coupled relation.These active damping algorithms will be influenced by other inverters and electric network impedance, to shunt chopper
The inhibitory effect of system resonance and mutual Harmonic Control still need further to be studied, while active damping method
The control algolithm for needing to upgrade again DSP in gird-connected inverter implements tool and acquires a certain degree of difficulty, and changes gird-connected inverter
Operational mode, the normal service life of inverter may be reduced.
Therefore, scholar proposes to inhibit device to inhibit system resonance using external centralized resonance.Resonance is pressed down
Device processed generally with other inverters be installed in parallel together points of common connection (Point of Common Coupling,
PCC), structure or control algolithm of this method without upgrading original mounted inverter, it is original to nor affect on inverter
The service life of inverter can be improved in operating mode.According to the difference of control mode, resonance inhibit device can be divided into passive and
Active type.Currently, active type resonance inhibits device to be limited by capacity and voltage class, switching frequency can not be improved, humorous to high order
The inhibitory effect of wave resonance is unsatisfactory, and it will cause great energy losses for passive resonance inhibition device, and to grid-connected
Point voltage has very big adverse effect.
Therefore, for the resonance problems of distributed inverter group system, the invention proposes a kind of adjustable impedance formulas point
Cloth photovoltaic power generation cluster resonance suppressing method.
Summary of the invention
The technical problem to be solved by the invention is to provide it is a kind of it is simple and direct be easily achieved, to active distribution network operating condition
It is adaptable, convenient for the adjustable impedance formula distributed photovoltaic power generation cluster resonance inhibiting system of practical engineering application and inhibition side
Method.
The technical scheme adopted by the invention is that: a kind of adjustable impedance formula distributed photovoltaic power generation cluster resonance inhibition system
System, include be connected in parallel on points of common connection by system busbar and distributed photovoltaic power generation cluster respectively, and with distribution
Formula photovoltaic power generation cluster is commonly through distribution network line equivalent inductance LgIt is incorporated to the central control unit of power distribution network, resonance inhibits single
Member and Reactive-power control unit, wherein the signal input of the signal output end connection central control unit of the Reactive-power control unit
It holds for exporting the status information of the inverter in Reactive-power control unit to central control unit, the Reactive-power control unit
Signal input part connects the signal output end of central control unit, for receiving the control signal of central control unit by idle tune
It saves the inverter in unit and exports practical reactive power, the resonance inhibits the signal input part of unit to connect central control unit
Signal output end, for receive central control unit sending investment reactor control instruction.
A kind of suppressing method of adjustable impedance formula distributed photovoltaic power generation cluster resonance inhibiting system, includes the following steps:
1) when adjustable impedance formula resonance inhibits device to detect that resonance occurs for photovoltaic cluster, central control unit is to resonance
Unit is inhibited to issue investment action command, control resonance inhibits the reactor group in unit to put into since 4 grades of intergrade；
2) central control unit calculates the idle output power ginseng of reactive compensation unit according to the investment series of reactor group
Examine value Qref；
3) the actual output current i of the inverter in Reactive-power control unit is measured using current transformer, it is mutual using voltage
Sensor measures inverter actual output voltage U and DC voltage U in Reactive-power control unitdc, and by actual output current i, reality
Border output voltage U and DC voltage UdcIt is sent into central control unit, is calculated in Reactive-power control unit by central control unit
Practical idle output power Q；
4) the DC voltage U for obtaining step 3)dcWith the direct voltage reference value U of settingdcrefIt is compared, by the two
Difference be sent into PI controller obtain d shaft current reference value idref, the reality that step 3) is obtained is idle output power Q and step
2) the idle output power reference value Q obtainedrefIt is compared, the difference of the two is sent into PI controller and obtains the reference of q shaft current
Value iqref；
5) the actual output current i for obtaining step 3) carries out dq decomposition, obtains the inverter in Reactive-power control unit
(39) practical d shaft current idWith practical q shaft current iq, by practical d shaft current idWith practical q shaft current iqThe d obtained with step 4)
Shaft current reference value idrefWith q shaft current reference value iqrefIt is sent into the current controller in central control unit together, obtains arteries and veins
The output signal U of wide modulation drive circuitref, and by the output signal UrefIt is sent to Reactive-power control unit, is controlled idle
Adjust the practical idle output power Q of inverter (39) in unit；
If 6) photovoltaic cluster resonance is inhibited, central control unit stops sending investment action command, terminates；If light
Volt cluster resonance is not inhibited yet, then central control unit continues that unit is inhibited to issue investment action command, control to resonance
Reactor group puts into series and increases level-one, return step 2), until photovoltaic cluster resonance is inhibited；
Idle output power reference value Q described in step 2)refIt is calculated using following formula:
In formula, X is the single-phase induction reactance value for having put into reactor, and U is that adjustable impedance formula resonance inhibits device to access power distribution network
Phase voltage.
Reactor group described in step 2) puts into series and increases level-one, is followed according to the sequence of 4-5-6-7-1-2-3-4
Ring switching.
Adjustable impedance formula distributed photovoltaic power generation cluster resonance inhibiting system of the invention and suppressing method are low using system
Pass filter characteristic changes system impedance by switched capacitor group, so that resonance frequency is shifted to high frequency, original photovoltaic is inverse not changing
Become on the basis of device control algolithm, effectively realizes the inhibition to distributed photovoltaic power generation group system resonance.Meanwhile the present invention
Introduce Reactive-power control unit, can the investment of effective compensation inactive component adversely affected caused by system fundamental voltage.This hair
Bright method is simple and direct to be easily achieved, adaptable to active distribution network operating condition, is convenient for practical engineering application.
Detailed description of the invention
Fig. 1 is adjustable impedance formula distributed photovoltaic power generation cluster resonance inhibiting system block diagram of the invention；
Fig. 2 is that central control unit constitutes block diagram in the present invention；
Fig. 3 is that current controller constitutes block diagram in central control unit；
Fig. 4 is that investment resonance inhibits grid current waveform figure before and after device；
Fig. 5 is not put into resonance networking electric current THD when device is inhibited to scheme；
Networking electric current THD schemes when Fig. 6 is 4 grades of investments；
Networking electric current THD schemes when Fig. 7 is 5 grades of investments；
Fig. 8 is grid entry point voltage change schematic diagram；
Fig. 9 is the idle output figure of inverter.
In figure
1: resonance inhibits unit 2: Reactive-power control unit
3: central control unit 4: system busbar
5: distributed photovoltaic power generation cluster 31: current controller
32: 33: the one PI controller of pwm unit
34: the two PI controller, 35: the first coordinate transformation unit
36: the second coordinate transformation unit, 37: the first subtracter
38: the second subtracters 39: inverter
40: the three PI controller, 41: the four PI controller
42: the first multiplier, 43: the second multiplier
44: third coordinate transformation unit 45: third subtracter
46: the four subtracter, 47: the first adder-subtractor
48: the second adder-subtractors 51: inverter
52: photovoltaic cell the L1: the first reactor group
L2: the second reactor group L3: third reactor group
Specific embodiment
Below with reference to example and attached drawing to adjustable impedance formula distributed photovoltaic power generation cluster resonance inhibiting system of the invention
And suppressing method is described in detail.
As shown in Figure 1, adjustable impedance formula distributed photovoltaic power generation cluster resonance inhibiting system of the invention, includes difference
It is connected in parallel on points of common connection PCC by system busbar 4 and distributed photovoltaic power generation cluster 5, and is sent out with distributed photovoltaic
Electric cluster 5 is commonly through distribution network line equivalent inductance LgIt is incorporated to the central control unit 3 of power distribution network, resonance inhibits 1 and of unit
Reactive-power control unit 2, wherein the signal input part of the signal output end connection central control unit 3 of the Reactive-power control unit 2
For exporting the status information of the inverter 39 in Reactive-power control unit 2 to central control unit 3, the Reactive-power control unit
The signal output end of 2 signal input part connection central control unit 3, for receive the control signal of central control unit 3 by
Inverter 39 in Reactive-power control unit 2 exports practical reactive power, and the resonance inhibits in the signal input part connection of unit 1
The signal output end for entreating control unit 3, the control instruction of the investment reactor for receiving the sending of central control unit 3.
As shown in Figure 1, it includes the first reactor group L1, the second reactor group L2 and that the resonance, which inhibits unit 1,
Three reactor group L3, the first reactor group L1, the second reactor group L2 are identical with third reactor group L3 structure, be by
Three inductance are constituted, and one end of three inductance is separately connected system busbar 4, and passes through system busbar 4 and distributed photovoltaic
Power generation cluster 5 is connected in parallel, and the other end of each of described three inductance inductance is the crystalline substance by two reverse parallel connections
Brake tube ground connection.IGBT group end receives the switching action command of central control unit, controls the switching of reactor group.
The resonance inhibits unit that can state are as follows:
Resonance inhibits unit to be made of three groups of reactor groups, and the shutdown of every group of reactor group is controlled by thyristor.By three
The capacity of group reactor group is arranged by ratio 4:2:1, is combined into 7 grades of ascending offset phases of capacity altogether.Reactor group is thrown
The relationship for cutting situation and series can be indicated by following table.
When resonance occurs for distributed photovoltaic power generation group system, resonance inhibits unit to receive what central control unit issued
Switching instruction, puts into reactor since 4 grades of intergrade.After reactor group investment, if distributed photovoltaic power generation group system
Resonance is not inhibited yet, then reactor group investment series successively increases, i.e., successively follows according to the sequence of 4-5-6-7-1-2-3-4
Ring switching, until distributed photovoltaic power generation group system resonance is inhibited.
As shown in Fig. 2, the central control unit 3 can choose Texas Instruments' TMS320C24x/F24x product.
The central control unit 3 includes current controller 31, the reference voltage U of the current controller 31refOutput end passes through
One pwm unit 32 connects the input terminal of Reactive-power control unit 2, the d shaft current reference value of the current controller 31
idrefInput terminal connects the first PI controller 33, the q shaft current reference value i of the current controller 31qrefInput terminal connection second
PI controller 34, the practical d shaft current i of inverter 39 in the Reactive-power control unit 2 of the current controller 31dInput terminal and
Practical q shaft current iqInput terminal connect the first coordinate transformation unit 35 output end, wherein the first PI controller 33
Input terminal connects the output end of the first subtracter 37, and two input terminals of the subtracter 37 are separately connected Reactive-power control unit 2
In 39 DC bus capacitor C of inverterdcReference voltage value UdcrefWith 39 DC bus capacitor of inverter in Reactive-power control unit 2
Actual voltage value Udc, the output end of input terminal the second subtracter 38 of connection of the 2nd PI controller 34, second subtraction
Two input terminals of device 38 are separately connected the reactive power Q and idle tune of 39 reality output of inverter in Reactive-power control unit 2
Save the reactive power reference qref Q that the inverter 39 in unit 2 exportsref, the input terminal connection of first coordinate transformation unit 35
The output end of 39 actual output current i of inverter in Reactive-power control unit 2, the inverter 39 in the Reactive-power control unit 2
Actual output voltage U exports the practical d axis of inverter 39 in Reactive-power control unit 2 by the second coordinate transformation unit 36 and exports electricity
Press UdWith the practical q axis output voltage U of inverter 39 in Reactive-power control unit 2qIt is connected to the voltage input of current controller 31
End.
First coordinate transformation unit 35 and the second coordinate transformation unit 36 are the change of abc coordinate system to dq coordinate system
It changes.
As shown in figure 3, the current controller 31 includes: the 3rd PI controller 40, the 4th PI controller 41, first
Multiplier 42, the two or three multiplier 43, third coordinate transformation unit 44, third subtracter 45, the 4th subtracter 46, first plus-minus
Musical instruments used in a Buddhist or Taoist mass 47 and the second adder-subtractor 48, wherein the input terminal of the third subtracter 45 is separately connected the d of the first PI controller 33
Shaft current reference value idrefThe practical d shaft current i of output end and the first coordinate transformation unit 35dOutput end, the third subtracter
45 output end connects the 3rd PI controller 40, and the input terminal of the first multiplier 42 connects the reality of the first coordinate transformation unit 35
D shaft current idOutput end is used for electric current idInhibit the practical investment inductance value L of reactor in unit 1 with fundamental wave frequency w and resonance
It is multiplied, 43 input terminal of the second multiplier connects the practical q shaft current i of the first coordinate transformation unit 35qOutput end, for electricity
Flow iqThe practical investment inductance value L of reactor in unit 1 is inhibited to be multiplied with fundamental wave frequency w and resonance, the 4th PI controller
41 input terminal is separately connected the q shaft current reference value i of the 2nd PI controller 34qrefOutput end and the first coordinate transformation unit 35
Practical q shaft current iqThe input terminal of output end, first adder-subtractor 47 is separately connected the 3rd PI controller 40 and third
The output end of multiplier 43 and the voltage U for connecting the second coordinate transformation unit 36dOutput end, second adder-subtractor 48
Input terminal is separately connected the second coordinate transform of output end and 42 output end of the first multiplier and connection of the 4th PI controller 41
The voltage U of unit 36qThe output end of output end, the output end of first adder-subtractor 47 and the second adder-subtractor 48 connects respectively
Meet the input terminal of third coordinate transformation unit 44, the output end output reference voltage U of third coordinate transformation unit 44refDescribed in
Pwm unit 32.
The third coordinate transformation unit 44 is the transformation of dq coordinate system to abc coordinate system.
Central control unit is the core that resonance inhibits device, when resonance occurs for distributed photovoltaic power generation group system,
It will inhibit unit to send the switching order of reactor group to resonance first, control the switching of reactor group, meanwhile, according to current electricity
Anti- device group puts into series, calculates the reactive power of investment reactor group post consumption.And by the idle reference value QrefIt is sent to nothing
Function adjusts unit, the idle output reference value as inverter.Idle reference value calculation formula is shown below,
In formula, X is the single-phase induction reactance value for having put into reactor,
U is the phase voltage of system.
If system resonance is not inhibited yet, central control unit continues to inhibit unit to send reactor group switching to resonance
Order increases reactor group investment series circulation, while the idle output for recalculating reactive compensation unit at this time being referred to
Value Qref, and send it to Reactive-power control unit.It is reciprocal with this, until system resonance is inhibited.
Adjustable impedance formula distributed photovoltaic power generation cluster resonance inhibiting system of the invention, if system resonance is not pressed down yet
System, central control unit continue to inhibit unit to send the switching order of reactor group to resonance, make reactor group investment series circulation
Increase, while the idle output reference value Q that reactive compensation unit at this time will be recalculatedref, and send it to Reactive-power control list
Member.It is reciprocal with this, until system resonance is inhibited.
Reactive-power control unit is made of a voltage-source type PWM inverter.It can choose model: XDSVG-380/100；Shanghai
Think of source is electrical/and SVG100Kvar kilovars；DBL-SVG100-4L-400V.It is real after resonance inhibits reactor group investment in unit
An inductive load can be equivalent on border, it will extreme influence, the work of Reactive-power control unit are caused to the fundamental voltage of grid entry point
With to export lagging reactive power, compensation reactor group puts into the lagging reactive power of post consumption.
The inverter of Reactive-power control unit will transmit Q by central control unit in above formularefAs idle reference value,
Lagging reactive power is injected to system, realizes the self-sufficient of reactive power, is i.e. resonance inhibits device not need to inhale to power grid
Lagging reactive power is received, the adverse effect of fundamental voltage generation after reactor group investment is effectively compensated for.
The suppressing method of adjustable impedance formula distributed photovoltaic power generation cluster resonance inhibiting system of the invention, including walk as follows
It is rapid:
1) when adjustable impedance formula resonance inhibits device to detect that resonance occurs for distributed photovoltaic power generation cluster, center control
Unit inhibits unit to issue investment action command to resonance, and control resonance inhibits the reactor group in unit to open from 4 grades of intergrade
Begin investment；
2) central control unit calculates the idle output power ginseng of reactive compensation unit according to the investment series of reactor group
Examine value Qref, the idle output power reference value QrefIt is calculated using following formula:
In formula, X is the single-phase induction reactance value for having put into reactor, and U is that adjustable impedance formula resonance inhibits device to access power distribution network
Phase voltage,
The reactor group investment series increases level-one, is the sequence switching cycle according to 4-5-6-7-1-2-3-4；
3) the actual output current i of the inverter in Reactive-power control unit is measured using current transformer, it is mutual using voltage
Sensor measures inverter actual output voltage U and DC voltage U in Reactive-power control unitdc, and by actual output current i, reality
Border output voltage U and DC voltage UdcIt is sent into central control unit, is calculated in Reactive-power control unit by central control unit
Practical idle output power Q；
4) the DC voltage U for obtaining step 3)dcWith the direct voltage reference value U of settingdcrefIt is compared, by the two
Difference be sent into PI controller obtain d shaft current reference value idref, the reality that step 3) is obtained is idle output power Q and step
2) the idle output power reference value Q obtainedrefIt is compared, the difference of the two is sent into PI controller and obtains the reference of q shaft current
Value iqref；
5) the actual output current i for obtaining step 3) carries out dq decomposition, obtains in Reactive-power control unit shown in FIG. 1
The practical d shaft current i of inverter (39)dWith practical q shaft current iq, by practical d shaft current idWith practical q shaft current iqWith step 4)
Obtained d shaft current reference value idrefWith q shaft current reference value iqrefThe electricity being sent into central control unit shown in FIG. 1 together
In stream controller, the output signal U of pulsewidth modulation driving circuit is obtainedref, and by the output signal UrefIt is sent to idle
Unit is adjusted, the practical idle output power Q of inverter (39) in Reactive-power control unit is controlled；
If 6) photovoltaic cluster resonance is inhibited, central control unit stops sending investment action command, terminates；If light
Volt cluster resonance is not inhibited yet, then central control unit continues that unit is inhibited to issue investment action command, control to resonance
Reactor group puts into series and increases level-one, return step 2), until photovoltaic cluster resonance is inhibited；
For the correctness and feasibility of the mentioned method of the verifying present invention, the distribution that voltage class is 380V (line voltage) is established
Net is made of two inverters in distribution.In inverter LCL filter, L1=1mH, L2=0.1mH, C=210uF.Resonance suppression
In device processed, the induction reactance value of each reactor group is respectively 0.2mH, 0.1mH, 0.05mH,.
Fig. 4 is that investment resonance inhibits grid current waveform figure before and after device, and Fig. 5 is networking when not putting into resonance inhibition device
Networking electric current THD when networking electric current THD, Fig. 7 are 5 grades of investments when electric current THD, Fig. 6 are 4 grades of investments.It can be seen that, do not throw therefrom
When entering resonance inhibition device, apparent resonance is had occurred in inverter system system, and resonance frequency is near 1150Hz, wave distortion
Rate has reached 20%；After resonance inhibits device to put into the 4th grade of intergrade, the resonance of system obtains certain inhibition, resonance
Frequency shifts are to 1280Hz, but networking percent harmonic distortion is still greater than 5%, and being unsatisfactory for networking requires；And inhibit device in resonance
It putting into after the 5th grade, the resonance frequency of system becomes 1380Hz, and the harmonic current content at resonance frequency is significantly suppressed,
The irregularity of wave form of networking electric current is only 1.5%.
Fig. 8 is grid entry point voltage change schematic diagram.Fig. 9 is the idle output figure of inverter, the inverter of Reactive-power control unit
Can effective compensation put into the consumed lagging reactive power of reactor group, and then overcome reactor group investment after fundamental voltage generation
Adverse effect.
By simulation result it is found that using the method that the present invention is mentioned, when not influencing system fundamental voltage, Ke Yiyou
Effect inhibits the resonance of distributed photovoltaic power generation system.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of protection of the claims
Subject to.
Claims (1)
1. a kind of suppressing method of adjustable impedance formula distributed photovoltaic power generation cluster resonance inhibiting system, adjustable impedance formula is distributed
Photovoltaic power generation cluster resonance inhibiting system includes in parallel with distributed photovoltaic power generation cluster (5) by system busbar (4) respectively
It is connected on points of common connection (PCC), and with distributed photovoltaic power generation cluster (5) commonly through distribution network line equivalent inductance Lg
It is incorporated to the central control unit (3) of power distribution network, resonance inhibits unit (1) and Reactive-power control unit (2), wherein the idle tune
The signal input part of signal output end connection central control unit (3) of section unit (2) is used for will be in Reactive-power control unit (2)
The status information of inverter (39), which exports, gives central control unit (3), the signal input part connection of the Reactive-power control unit (2)
The signal output end of central control unit (3), for receiving the control signal of central control unit (3) by Reactive-power control unit
(2) inverter (39) in exports practical reactive power, and the resonance inhibits the signal input part connection center control of unit (1)
The signal output end of unit (3), the control instruction of the investment reactor for receiving central control unit (3) sending；Its feature
It is, method includes the following steps:
1) when adjustable impedance formula resonance inhibits device to detect that resonance occurs for photovoltaic cluster, central control unit inhibits to resonance
Unit issues investment action command, and control resonance inhibits the reactor group in unit to put into since 4 grades of intergrade；
2) central control unit calculates the idle output power reference value of reactive compensation unit according to the investment series of reactor group
Qref；Wherein,
The idle output power reference value QrefIt is calculated using following formula:
In formula, X is the single-phase induction reactance value for having put into reactor, and U is the phase that adjustable impedance formula resonance inhibits device access power distribution network
Voltage；
The reactor group investment series increases level-one, is the sequence switching cycle according to 4-5-6-7-1-2-3-4；
3) the actual output current i that the inverter in Reactive-power control unit is measured using current transformer, uses voltage transformer
Measure the inverter actual output voltage U and DC voltage U in Reactive-power control unitdc, and actual output current i, reality is defeated
Voltage U and DC voltage U outdcIt is sent into central control unit, the reality in Reactive-power control unit is calculated by central control unit
Idle output power Q；
4) the DC voltage U for obtaining step 3)dcWith the direct voltage reference value U of settingdcrefIt is compared, by the difference of the two
It is sent into PI controller and obtains d shaft current reference value idref, the idle output power Q of reality and step 2) that step 3) obtains are obtained
Idle output power reference value QrefIt is compared, the difference of the two is sent into PI controller and obtains q shaft current reference value
iqref；
5) the actual output current i for obtaining step 3) carries out dq decomposition, and the inverter (39) obtained in Reactive-power control unit is real
Border d shaft current idWith practical q shaft current iq, by practical d shaft current idWith practical q shaft current iqThe d shaft current obtained with step 4)
Reference value idrefWith q shaft current reference value iqrefIt is sent into the current controller in central control unit together, obtains pulsewidth modulation
The output signal U of driving circuitref, and by the output signal UrefIt is sent to Reactive-power control unit, controls Reactive-power control list
The practical idle output power Q of inverter (39) in member；
If 6) photovoltaic cluster resonance is inhibited, central control unit stops sending investment action command, terminates；If photovoltaic collection
Group's resonance is not inhibited yet, then central control unit continues that unit is inhibited to issue investment action command to resonance, controls reactance
Device group puts into series and increases level-one, return step 2), until photovoltaic cluster resonance is inhibited.
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| CN105098833A (en) * | 2015-08-12 | 2015-11-25 | 国网山东省电力公司电力科学研究院 | Asynchronous constant speed wind turbine system for micro grid and working method thereof |
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