CN205901318U - A controlling means for unbalanced three phase and reactive compensation - Google Patents
A controlling means for unbalanced three phase and reactive compensation Download PDFInfo
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- CN205901318U CN205901318U CN201620744009.8U CN201620744009U CN205901318U CN 205901318 U CN205901318 U CN 205901318U CN 201620744009 U CN201620744009 U CN 201620744009U CN 205901318 U CN205901318 U CN 205901318U
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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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- 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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The utility model provides a controlling means for unbalanced three phase and reactive compensation, include: three -phase switch control circuit, filter module and current sample module, three -phase switch control circuit is connected to the electric wire netting through filter module, three -phase switch control circuit and filter module all are connected to on A, B, C and the N line of three -phase load, the three -phase output current of three -phase load is connected to through the current sample module respectively filter module. The utility model discloses a three -phase switch control circuit's loop control three -phase output current, each negative component instantaneous value and zero component instantaneous value that the feasible three -phase inductive current who exports isolated, each negative component who isolates with the ABC three -phase output current of three -phase load side compares with zero component, the size equals and opposite direction, thereby make the ABC three phase current of electric wire netting balanced, quick response has been realized, the unbalanced three phase electric current of accurate dynamic compensation three -phase load, compensate idle mesh simultaneously.
Description
Technical field
This utility model is related to a kind of three-phase control device, more particularly, to a kind of for three-phase imbalance and reactive-load compensation
Control device.
Background technology
The three-phase four-wire system mode of connection is adopted in a large number, with the continuous improvement of living standards of the people, electricity in the power distribution network of town and country
In Force system there is large change in power load structure.Residential electricity consumption device category increases, and power consumption increases therewith, exists very
How single-phase threephase load, so that the three-phase imbalance problem of field of distribution network is more and more prominent, thus leads to the electrical network quality of power supply
Problem is also increasingly serious.Some regional station low pressure side current unbalance factors are more than 80%.The impact that three-phase imbalance causes is just
Threaten the electrical equipment of user, to improve the quality of power supply in the urgent need to compensation device.Long-term three-phase imbalance, can increase platform area
The loss of transformator, current in middle wire increases, and causes center line to burn, then electrical equipment is caused damage.Accordingly, it would be desirable to a kind of dress
Put, first have to suppress the three-phase current unbalance of threephase load, make the electric current through this device reach equilibrium；Secondly, exist
Compensate the unbalanced power factor that can compensate for the idle of threephase load side simultaneously, improve net side in threephase load side.
But, it is impossible to quick compensating reactive power, compensation precision cannot be protected for the electric capacity that conventional art is related to and inductance switching device
Card is it is impossible to effectively adjust the imbalance of three phases active power (electric current)；Current imbalance adjust after degree of unbalancedness still above
5% it is impossible to meet compensation precision requirement, and regulating power is limited.
Svg (static state reactive generator) is mainly compensating reactive power, is used for three-phase three-wire system high pressure no neutral system, because
Do not possess center line, so zero-sequence current cannot be compensated it is impossible to adjust idle imbalance.Apf (active filter) can only be to electricity
The harmonic wave of stream compensates it is impossible to compensate zero-sequence current, limited in one's ability for three phases active power imbalance compensation.
In addition, the scheme such as three-phase four-arm can compensate zero-sequence current, but efficiency is low, increased cost.That is,
The shortcoming that prior art exists mainly has: is used for three-phase three-wire system, the neutral line current of three-phase and four-line has no idea to suppress；Topology
Complexity, using schemes such as three-phase four-arms, increased cost；Use with capacitor switching device simultaneously, in electric current, contain 3,5,7,9
With 11 grade low-order harmonics, cause resonance；Idle and current imbalance cannot be compensated with a device, the time required for compensating
Long, compensation precision can not meet requirement.
Content of the invention
Technical problem to be solved in the utility model be need provide one kind can quick response, accurate dynamic compensation
The three phase unbalance current of threephase load, the control device for three-phase imbalance and reactive-load compensation of compensating reactive power simultaneously, and
The control method employing this for three-phase imbalance and the control device of reactive-load compensation is provided.
In this regard, this utility model provides a kind of control device for three-phase imbalance and reactive-load compensation, comprising: three-phase is opened
Close control circuit, filtration module and current sample module, described threephase switch control circuit by described filtration module connect to
Electrical network, described threephase switch control circuit and filtration module are connected on the n line of threephase load, the three-phase of described threephase load
Output current is connected to described filtration module by current sample module respectively.
Further improvement of the utility model is, described threephase switch control circuit is to be parallel to t type three electricity of electrical network
Flat topological circuit.
Further improvement of the utility model is, described filtration module includes inductance l1, electric capacity c11, inductance l4, inductance
L2, electric capacity c12, inductance l5, inductance l3, electric capacity c13 and inductance l6, one end of described inductance l4 connects to electrical network and threephase load
Between a line, the other end of described inductance l4 is connected with one end of described inductance l1 and one end of electric capacity c11 respectively, described
The other end of inductance l1 connects to described threephase switch control circuit, and the other end of described electric capacity c11 connects to electrical network and three-phase
N line between load；One end of described inductance l5 connects to the b line between electrical network and threephase load, and described inductance l5's is another
End is connected with one end of described inductance l2 and one end of electric capacity c12 respectively, and the other end of described inductance l2 connects to described three
Phase ON-OFF control circuit, the other end of described electric capacity c12 connects to the n line between electrical network and threephase load；Described inductance l6's
One end connects to the c line between electrical network and threephase load, the other end of described inductance l6 respectively with one end of described inductance l3 and
One end of electric capacity c13 is connected, and the other end of described inductance l3 connects to described threephase switch control circuit, described electric capacity c13
The other end connect to the n line between electrical network and threephase load.
Further improvement of the utility model is, described filtration module also includes Hall element h1, Hall element
The other end of h2 and Hall element h3, described inductance l4 is connected by Hall element h1 to one end of described inductance l1；Institute
The other end stating inductance l5 is connected by Hall element h2 to one end of described inductance l2；The other end of described inductance l6 passes through
Hall element h3 connects to one end of described inductance l3.
Further improvement of the utility model is, described threephase switch control circuit includes switching tube sa1, switching tube
sa2, switching tube sa3, switching tube sa4, switching tube sb1, switching tube sb2, switching tube sb3, switching tube sb4, switching tube sc1, switching tube
sc2, switching tube sc3, switching tube sc4, dc-link capacitance c1 and dc-link capacitance c2；Described switching tube sa1Emitter stage,
Switching tube sa3Colelctor electrode and switching tube sa4Colelctor electrode be connected to described inductance l1 one end away from inductance l4, described open
Close pipe sa3Emitter stage connect to described switching tube sa2Emitter stage, described switching tube sa1Colelctor electrode connect to dc bus
The positive pole of electric capacity c1, described switching tube sa2Colelctor electrode to dc-link capacitance c1 negative pole and dc-link capacitance c2 just connect
N line between pole, described switching tube sa4Emitter stage connect to the negative pole of dc-link capacitance c2；Described switching tube sb1Send out
Emitter-base bandgap grading, switching tube sb3Colelctor electrode and switching tube sb4Colelctor electrode be connected to described inductance l2 one end away from inductance l5,
Described switching tube sb3Emitter stage connect to described switching tube sb2Emitter stage, described switching tube sb1Colelctor electrode connect to straight
The positive pole of stream bus capacitor c1, described switching tube sb2Colelctor electrode connect to dc-link capacitance c1 negative pole and dc bus electricity
Hold the n line between c2 positive pole, described switching tube sb4Emitter stage connect to the negative pole of dc-link capacitance c2；Described switching tube
sc1Emitter stage, switching tube sc3Colelctor electrode and switching tube sc4Colelctor electrode be connected to described inductance l3 away from inductance l6's
One end, described switching tube sc3Emitter stage connect to described switching tube sc2Emitter stage, described switching tube sc1Colelctor electrode even
It is connected to dc-link capacitance c1 positive pole, described switching tube sc2Colelctor electrode connect female to dc-link capacitance c1 negative pole and direct current
N line between line capacitance c2 positive pole, described switching tube sc4Emitter stage connect to the negative pole of dc-link capacitance c2.
Further improvement of the utility model is, one end of described dc-link capacitance c1 respectively with described switching tube
sa1Colelctor electrode, switching tube sb1Colelctor electrode and switching tube sc1Colelctor electrode be connected, described dc-link capacitance c1's is another
One end respectively with described switching tube sa2Colelctor electrode, switching tube sb2Colelctor electrode and switching tube sc2Colelctor electrode be connected；Institute
State one end of dc-link capacitance c2 respectively with described switching tube sa4Emitter stage, switching tube sb4Emitter stage and switching tube sc4
Emitter stage be connected, the other end of described dc-link capacitance c2 respectively with described switching tube sa2Colelctor electrode, switching tube sb2
Colelctor electrode and switching tube sc2Colelctor electrode be connected.
Further improvement of the utility model is, described current sample module is gathered described respectively by current sensor
The three-phase output current of threephase load.
Compared with prior art, the beneficial effects of the utility model are: threephase switch control circuit in parallel
Loop controls the output current of abc three pole reactor electric current so that each negative sequence component of going out of three pole reactor current separation of output
Instantaneous value and zero-sequence component instantaneous value, and each negative sequence component and zero that the abc three-phase output current of threephase load side is isolated
Order components are compared, equal in magnitude and in opposite direction, so that the abc three-phase current equilibrium of electrical network, and the power factor of electrical network
Reach 0.99 it is achieved that quick response, the three phase unbalance current of accurate dynamic compensation threephase load, compensating reactive power simultaneously
Purpose.
Brief description
Fig. 1 is a kind of circuit theory diagrams of embodiment of this utility model.
Specific embodiment
Below in conjunction with the accompanying drawings, preferably embodiment of the present utility model is described in further detail.
Embodiment 1:
As shown in figure 1, this example provides a kind of control device for three-phase imbalance and reactive-load compensation, comprising: three-phase is opened
Close control circuit, filtration module and current sample module, described threephase switch control circuit by described filtration module connect to
Electrical network, described threephase switch control circuit and filtration module are connected on a, b, c and n line of threephase load, and described three-phase is born
The three-phase output current carrying is connected to described filtration module by current sample module respectively.
Control device output three pole reactor electric current, each negative phase-sequence and zero that described three pole reactor current separation goes out described in this example
Order components, each negative phase-sequence that this three pole reactor current separation goes out and zero-sequence component and the three-phase output current institute of described threephase load
Each negative phase-sequence of isolating and zero-sequence component equal in magnitude and in opposite direction.Fig. 1 is that the circuit theory of described control device is opened up
Flutterring figure, be three-phase four-wire system, be finally connected in parallel on electrical network, realizing the electric current compensating on threephase load n line so that being connected to the grid
Electric current tends to equalizing.Described threephase switch control circuit is to be parallel to the t type three-level topology circuit of electrical network.
As shown in figure 1, filtration module described in this example includes inductance l1, electric capacity c11, inductance l4, inductance l2, electric capacity c12, electricity
Sense l5, inductance l3, electric capacity c13 and inductance l6, one end of described inductance l4 connects to a line between electrical network and threephase load, institute
The other end stating inductance l4 is connected with one end of described inductance l1 and one end of electric capacity c11 respectively, and described inductance l1's is another
End connects to described threephase switch control circuit, and the other end of described electric capacity c11 connects to the n between electrical network and threephase load
Line；One end of described inductance l5 connects to the b line between electrical network and threephase load, the other end of described inductance l5 respectively with described
One end of inductance l2 is connected with one end of electric capacity c12, and the other end of described inductance l2 connects to described threephase switch control electricity
Road, the other end of described electric capacity c12 connects to the n line between electrical network and threephase load；One end of described inductance l6 connects to electricity
C line between net and threephase load, the other end of described inductance l6 respectively with one end of described inductance l3 and one end of electric capacity c13
Be connected, the other end of described inductance l3 connects to described threephase switch control circuit, the other end of described electric capacity c13 connect to
N line between electrical network and threephase load.
As shown in figure 1, filtration module described in this example also includes Hall element h1, Hall element h2 and Hall element
The other end of h3, described inductance l4 is connected by Hall element h1 to one end of described inductance l1；Described inductance l5's is another
End is connected by Hall element h2 to one end of described inductance l2；The other end of described inductance l6 passes through Hall element h3 even
It is connected to one end of described inductance l3.
As shown in figure 1, threephase switch control circuit includes switching tube sa described in this example1, switching tube sa2, switching tube sa3, open
Close pipe sa4, switching tube sb1, switching tube sb2, switching tube sb3, switching tube sb4, switching tube sc1, switching tube sc2, switching tube sc3, open
Close pipe sc4, dc-link capacitance c1 and dc-link capacitance c2；Described switching tube sa1Emitter stage, switching tube sa3Colelctor electrode
With switching tube sa4Colelctor electrode be connected to described inductance l1 one end away from inductance l4, described switching tube sa3Emitter stage even
It is connected to described switching tube sa2Emitter stage, described switching tube sa1Colelctor electrode connect to the positive pole of dc-link capacitance c1, described
Switching tube sa2Colelctor electrode connect to the n line between dc-link capacitance c1 negative pole and dc-link capacitance c2 positive pole, described open
Close pipe sa4Emitter stage connect to the negative pole of dc-link capacitance c2；Described switching tube sb1Emitter stage, switching tube sb3Collection
Electrode and switching tube sb4Colelctor electrode be connected to described inductance l2 one end away from inductance l5, described switching tube sb3Transmitting
Pole connects to described switching tube sb2Emitter stage, described switching tube sb1Colelctor electrode connect to the positive pole of dc-link capacitance c1,
Described switching tube sb2Colelctor electrode connect to the n line between dc-link capacitance c1 negative pole and dc-link capacitance c2 positive pole, institute
State switching tube sb4Emitter stage connect to the negative pole of dc-link capacitance c2；Described switching tube sc1Emitter stage, switching tube sc3
Colelctor electrode and switching tube sc4Colelctor electrode be connected to described inductance l3 one end away from inductance l6, described switching tube sc3's
Emitter stage connects to described switching tube sc2Emitter stage, described switching tube sc1Colelctor electrode to dc-link capacitance c1 just connect
Pole, described switching tube sc2Colelctor electrode connect to the n between dc-link capacitance c1 negative pole and dc-link capacitance c2 positive pole
Line, described switching tube sc4Emitter stage connect to the negative pole of dc-link capacitance c2.
As shown in figure 1, one end of dc-link capacitance c1 described in this example respectively with described switching tube sa1Colelctor electrode, open
Close pipe sb1Colelctor electrode and switching tube sc1Colelctor electrode be connected, the other end of described dc-link capacitance c1 respectively with described
Switching tube sa2Colelctor electrode, switching tube sb2Colelctor electrode and switching tube sc2Colelctor electrode be connected；Described dc-link capacitance
One end of c2 respectively with described switching tube sa4Emitter stage, switching tube sb4Emitter stage and switching tube sc4Emitter stage be connected
Connect, the other end of described dc-link capacitance c2 respectively with described switching tube sa2Colelctor electrode, switching tube sb2Colelctor electrode and open
Close pipe sc2Colelctor electrode be connected.
As shown in figure 1, current sample module described in this example passes through current sensor ct1, current sensor ct2 and electric current passes
Sensor ct3 gathers the three-phase output current of described threephase load respectively.
Totally 12 switching tubes of threephase switch control circuit described in this example, every 4 switching tubes of phase in abc three-phase, a phase is 4
Switching tube, i.e. switching tube sa1, switching tube sa2, switching tube sa3With switching tube sa4；B phase is 4 switching tubes, i.e. switching tube sb1, open
Close pipe sb2, switching tube sb3With switching tube sb4；C phase is 4 switching tubes, i.e. switching tube sc1, switching tube sc2, switching tube sc3With open
Close pipe sc4.This example preferably produces spwm with the dsp chip controls of ti company of the U.S. and sends out ripple, finally drives 12 switching tubes open-minded
And shutoff, control three pole reactor electric current, reach compensation threephase load side current imbalance and idle purpose.
In described filtration module, filter function realized by totally 3 groups of lcl wave filter to abc three-phase, and 6 ac filter inductance l1 are extremely
Inductance l6,3 ac filter electric capacity c11 to electric capacity c13.Electric capacity c1 and electric capacity c2 is respectively positive and negative dc-link capacitance group.Its
In loop be that positive and negative busbar difference adjusts loop, control the electric voltage equalization on electric capacity c1 and electric capacity c2.Hall element h1, suddenly
Your sensor h2 and Hall element h3 is three Hall elements, gathers the abc three-phase of three-phase imbalance compensation device respectively
Inductive current, as the feedback quantity extracting control loop.Current sensor ct1, current sensor ct2 and current sensor ct3
For ct sensor, it is the sampling apparatuses of the abc three-phase output current of collection threephase load, given as extraction control loop
Amount.
Compensating unbalanced effect is, ia ', the ib ' of threephase load side and ic ' three-phase current virtual value are unequal, and in ' is remote
More than 0, ia, ib and ic current balance and net side power factor reaches 0.99, in and is approximately 0 after overcompensation.Such as three-phase is born
Carry side abc three-phase output current virtual value and be respectively 5a, 10a and 15a, add this compensation device, net side abc three-phase electricity after compensation
Stream virtual value is respectively 10a, 10a and 10a.
The loop of this example threephase switch control circuit in parallel controls the output current of abc three pole reactor electric current, makes
Each negative sequence component instantaneous value and zero-sequence component instantaneous value that the three pole reactor current separation that must export goes out, and threephase load side
Each negative sequence component that abc three-phase output current is isolated is compared with zero-sequence component, equal in magnitude and in opposite direction, so that
The abc three-phase current equilibrium of electrical network, and the power factor of electrical network reaches 0.99 (theoretical value 1) it is achieved that quick response, accurately
Dynamic compensation threephase load three phase unbalance current, the purpose of compensating reactive power simultaneously.
This example may also provide a kind of control method for three-phase imbalance and reactive-load compensation, employs as above
For the control device of three-phase imbalance and reactive-load compensation, and comprise the following steps:
Step s1, calculates the first given zero-sequence component；
Step s2, extracts the second positive-sequence component filter value of three-phase output current, the 3rd positive-sequence component filter value, second negative
Order components filter value and the 3rd negative sequence component filter value, and simultaneously extract three pole reactor electric current the second positive-sequence component instantaneous value,
3rd positive-sequence component instantaneous value, the second negative sequence component instantaneous value and the 3rd negative sequence component instantaneous value；
Step s3, to given value of current filter value in the control loop of described control device, and the instantaneous value of feedback current.
It is noted that this control method that this example is provided is a kind of preferred control method, use described in this example
Control device in three-phase imbalance and reactive-load compensation is not limited to also not dependent on a kind of this control method.
In step s1 described in this example, using formula i0=(ia0+ib0+ic0)/3 calculate given the of three-phase output current
One zero-sequence component, wherein ia0、ib0And ic0It is respectively the three-phase output current of threephase load, i0For three-phase output current first
Zero-sequence component；Using formula i0*=(ia0+ib0+ ic)/3 calculating three pole reactor electric currents the first given zero-sequence component, wherein
Ia, ib and ic are respectively three pole reactor electric current, i0* it is the first zero-sequence component of three pole reactor electric current；
Described first zero-sequence component is also referred to as z-axis zero-sequence component, is also threephase load current in middle wire simultaneously；Described three-phase output
First zero-sequence component of electric current is also inductance current in middle wire；This example asks for threephase load current in middle wire i0With inductance current in middle wire i0*
Purpose be that the loop of this control device of later use controls the current in middle wire of this device output so that it and threephase load side
Electric current on zero line equal in magnitude, in opposite direction.Thus compensating net side current in middle wire so that current on line side is 0.
Described three-phase output current refers to the three-phase current of threephase load；Described three pole reactor electric current refers to control back
The three-phase current of inductance in road；Described second positive-sequence component is also referred to as electric current positive sequence d axle component, and the 3rd positive-sequence component is just being also referred to as electric current
Sequence q axle component, the second negative sequence component is also referred to as electric current negative phase-sequence d axle component, and the 3rd negative sequence component is also referred to as electric current negative phase-sequence q axle component；The
Two positive-sequence component instantaneous values are also referred to as electric current positive sequence d axle component instantaneous value, and the 3rd positive-sequence component instantaneous value is also referred to as electric current positive sequence q axle and divides
Amount instantaneous value, the second negative sequence component instantaneous value is also referred to as electric current negative phase-sequence d axle component instantaneous value, and the 3rd negative sequence component instantaneous value is also referred to as electricity
Stream negative phase-sequence q axle component instantaneous value.Wherein, d axle and q axle are exactly two orthogonal coordinate axess in synchronous rotating frame in fact, d
Axle and the corresponding positive-sequence component of q axle and negative sequence component are exactly three-phase current in fact on two coordinate axess of synchronous rotating frame
Projection.
In described step s2, using the alternative manner based on inertia low-pass filtering, by formula id_posl_filter (k)
+=id_posl_filter (k-1)+(id_posl (k)-id_posl_filter (k-1))-m extracts the of three-phase output current
Two positive-sequence component filter values, by formula iq_posl_filter (k) +=iq_posl_filter (k-1)+(iq_posl (k)-
Iq_posl_filter (k-1)) * m extraction the 3rd positive-sequence component filter value, by formula id_negl_filter (k) +=id_
Negl_filter (k-1)+(id_negl (k)-id_negl_filter (k-1)) * m extracts the second negative sequence component filter value, leads to
Cross formula iq_neg1_filter (k) +=iq_neg1_filter (k-1)+(iq_neg1 (k)-iq_neg1_filter (k-
1)) * m extracts the 3rd negative sequence component filter value；Described second positive-sequence component filter value is the filter value of the second positive-sequence component, described
3rd positive-sequence component filter value is the filter value of the 3rd positive-sequence component, and described second negative sequence component filter value is the second negative sequence component
Filter value, described 3rd negative sequence component filter value is the filter value of the 3rd negative sequence component.By formula id_posl (k)=id_
pos0(k)-(id_negl_filter(k-1)*cos2theta(k))-(iq_neg1_filter(k-1)*sin2theta(k))
Extract the second positive-sequence component instantaneous value of three pole reactor electric current, by formula id_posl (k)=id_pos0 (k)-(id_negl_
Filter (k-1) * sin2theta (k))-(iq_neg1_filter (k-1) * cos2theta (k)) extraction the 3rd positive-sequence component
Instantaneous value, by formula id_posl (k)=id_pos0 (k)-(id_negl_filter (k-1) * cos2theta (k))-(iq_
Neg1_filter (k-1) * sin2theta (k)) extract the second negative sequence component instantaneous value, by formula id_posl (k)=id_
pos0(k)-(id_negl_filter(k-1)*sin2theta(k))-(iq_neg1_filter(k-1)*cos2theta(k))
Extract the 3rd negative sequence component instantaneous value.
The above formula, be using the alternative manner based on inertia low-pass filtering extract three-phase output current second just
Order components filter value, the 3rd positive-sequence component filter value, the second negative sequence component filter value and the 3rd negative sequence component filter value, and simultaneously
Extract the second positive-sequence component instantaneous value of three pole reactor electric current, the 3rd positive-sequence component instantaneous value, the second negative sequence component instantaneous value and
3rd negative sequence component instantaneous value；In practical application, three phase places of these three-phase currents can also be realized by other means
The numerical value of positive-sequence component and negative sequence component extracts.
Wherein, the digital controlling cycle of algorithm Main Basiss circulation in U.S. ti company dsp chip is realized controlling.Formula
In, id_pos1_filter (k) is current time digital control cycle (kth time) electric current positive sequence d axle component filter value, that is, currently
The second positive-sequence component filter value in digital control cycle in moment；Iq_pos1_filter (k) is the current time digital control cycle
(kth time) electric current positive sequence q axle component filter value, i.e. the 3rd positive-sequence component filter value in current time digital control cycle；id_
Neg1_filter (k) is current time digital control cycle (kth time) electric current negative phase-sequence d axle component filter value, i.e. current time number
Second negative sequence component filter value of word controlling cycle；Iq_neg1_filter (k) is current time digital control cycle (kth time)
Electric current negative phase-sequence q axle component filter value, i.e. the 3rd negative sequence component filter value in current time digital control cycle.
Id_pos1_filter (k-1) is upper one digital controlling cycle (k-1 time) electric current positive sequence d axle component filter value,
Go up the second positive-sequence component filter value of a digital controlling cycle；Iq_pos1_filter (k-1) is digital control for upper one
Cycle (k-1 time) electric current positive sequence q axle component filter value, that is, go up the 3rd positive-sequence component filter value of a digital controlling cycle；id_
Neg1_filter (k-1) is upper one digital controlling cycle (k-1 time) electric current negative phase-sequence d axle component filter value, that is, go up a numeral
Second negative sequence component filter value of controlling cycle；Iq_neg1_filter (k-1) is upper one digital (k-1 time) electricity of controlling cycle
Stream negative phase-sequence q axle component filter value, that is, go up the 3rd negative sequence component filter value of a digital controlling cycle.
Id_pos1 (k) is the electric current positive sequence d axle component instantaneous value of current time digital control cycle (kth time), that is, currently
The second positive-sequence component instantaneous value in digital control cycle in moment；Iq_pos1 (k) is current time digital control cycle (kth time)
Electric current positive sequence q axle component instantaneous value, i.e. the 3rd positive-sequence component instantaneous value in current time digital control cycle；id_neg1(k)
For the electric current negative phase-sequence d axle component instantaneous value in current time digital control cycle (kth time), i.e. the current time digital control cycle
Second negative sequence component instantaneous value；
Iq_neg1 (k) is the electric current negative phase-sequence q axle component instantaneous value of current time digital control cycle (kth time), that is, currently
The 3rd negative sequence component instantaneous value in digital control cycle in moment.
Id_pos0 (k) is the electric current positive sequence d axle component initial value of current time digital control cycle (kth time), that is, currently
The second positive-sequence component initial value in digital control cycle in moment；Iq_pos0 (k) is current time digital control cycle (kth time)
Electric current positive sequence q axle component initial value, i.e. the 3rd positive-sequence component initial value in current time digital control cycle；id_neg0(k)
For the electric current negative phase-sequence d axle component initial value in current time digital control cycle (kth time), i.e. the current time digital control cycle
Second negative sequence component initial value；Iq_neg0 (k) is at the beginning of the electric current negative phase-sequence q axle component of current time digital control cycle (kth time)
Initial value, i.e. the 3rd negative sequence component initial value in current time digital control cycle.Cos2theta (k) is current time numeral control
(2theta is the anglec of rotation of the equipollent vectors of 2 times of three-phase power grid voltage to 2 times of lock phase angle cosine values of cycle (kth time) processed
Degree)；Sin2theta (k) is that (2theta is 2 times for 2 times of lock phase angle sine values in current time digital control cycle (kth time)
The anglec of rotation of the equipollent vectors of three-phase power grid voltage)；M is filter factor, and wherein m=0.125 is preferred representative value.
Three-phase imbalance device is essentially a current source, using follow the tracks of line voltage positive sequence phase locked algorithm so that
Inductive current can follow the tracks of frequency and the phase place of line voltage.The anglec of rotation of the equipollent vectors of locking three-phase power grid voltage
Theta, calculates sine value and the cosine value of 2 times of theta.Threephase load electric current ia0, ib0, ic0 and three pole reactor electric current ia,
Ib, ic, through dual d-q transformation, obtain positive sequence d axle component, positive sequence q axle component, negative phase-sequence d axle component, negative phase-sequence q axle component.
Positive sequence d axle component, the initializaing variable of positive sequence q axle component, negative phase-sequence d axle component and negative phase-sequence q axle component are followed successively by id_
Pos0 (k) (current time digital control periodic current positive sequence d axle component initial value), iq_pos0 (k) (current time numeral control
Periodic current positive sequence q axle component initial value processed), id_neg0 (k) is (at the beginning of current time digital control periodic current negative phase-sequence d axle component
Initial value) and iq_neg0 (k) (current time digital control periodic current negative phase-sequence q axle component initial value), initial value folds for DC quantity
Plus 2 frequency multiplication interference volumes.Id_pos0 (k), iq_pos0 (k), id_neg0 (k) and iq_neg0 (k) eliminate 2 frequency multiplication interference more respectively
After amount, obtain id_pos1 (k) (current time digital control periodic current positive sequence d axle component instantaneous value), iq_pos1 (k) (when
Digital control periodic current positive sequence q axle component instantaneous value of front moment), id_neg1 (k) (the digital control periodic current of current time
Negative phase-sequence d axle component instantaneous value) and iq_neg1 (k) (current time digital control periodic current negative phase-sequence q axle component instantaneous value).
Id_pos1_filter (k) (current time digital control periodic current positive sequence d axle component filter value), iq_pos1_
Filter (k) (current time digital control periodic current positive sequence q axle component filter value), id_neg1_filter (k) are (when current
Carve digital control periodic current negative phase-sequence d axle component filter value) and iq_neg1_filter (k) (the current time digital control cycle
Electric current negative phase-sequence q axle component filter value) it is respectively the filter of id_pos1 (k), iq_pos1 (k), id_neg1 (k) and iq_neg1 (k)
Ripple amount, chooses suitable filter value m, after iterative extraction, finally gives instantaneous value id_pos1 (k), iq_pos1 (k), id_
Neg1 (k) and iq_neg1 (k) and filter value id_pos1_filter (k), iq_pos1_filter (k), id_neg1_
Filter (k) and iq_neg1_filter (k).
In described step s3, to given value of current filter value be the second positive-sequence component filter value, the 3rd positive-sequence component filter value,
Second negative sequence component filter value and the 3rd negative sequence component filter value, wherein, the second positive-sequence component filter value takes 0；Feedback current
Instantaneous value is that the second positive-sequence component instantaneous value, the 3rd positive-sequence component instantaneous value, the second negative sequence component instantaneous value and the 3rd negative phase-sequence are divided
Amount instantaneous value.
Second positive-sequence component of this example extraction three-phase output current, the 3rd positive-sequence component, the second negative sequence component and the 3rd are negative
Order components, and the second positive-sequence component instantaneous value of extraction three pole reactor electric current, the 3rd positive-sequence component instantaneous value, the second negative phase-sequence simultaneously
Component instantaneous value and the 3rd negative sequence component instantaneous value, synchroballistic negative phase-sequence and zero sequence, zero-sequence component takes into account positive and negative busbar balance；?
On the basis of this, to given value of current filter value in the control loop of described control device, can filter 3,5,7,9 and 11 times humorous
Ripple, it is to avoid resonance, the instantaneous value of feedback current, accelerate response speed it is ensured that being fully compensated in the 10ms time；This utility model is adopted
Use pi+ Repetitive controller, control the second positive-sequence component, the 3rd positive-sequence component, the second negative sequence component, the 3rd negative sequence component and zero sequence to divide
Five loops of amount control, and improve imbalance compensation precision, compensating reactive power simultaneously from dynamic and two aspects of stable state.
This example adopts pi+ Repetitive controller, controls the second positive-sequence component, the 3rd positive-sequence component, the second negative sequence component, the 3rd negative
Order components and five loops of the first zero-sequence component work control, and improve imbalance compensation ability, compensating reactive power simultaneously.
Wherein the strategy in control loop is, gives and measures filter value, and feedback measures instantaneous value.Reach result be elimination 3,
5th, the inferior low-order harmonic in 7,9 and 11, it is to avoid resonance.Specific practice is that during loop controls, given value of current is: 0 (three using filter value
First positive-sequence component of phase load electric current takes 0, because the first positive-sequence component of threephase load electric current pair needs not compensate for) ,-iq0+
(the 3rd positive-sequence component filter value of threephase load electric current) ,-id0-(the second negative sequence component filter value of threephase load electric current) and-
iq0-(the 3rd negative sequence component filter value of threephase load electric current).Current feedback using instantaneous value is: id+(the second of inductive current
Positive-sequence component instantaneous value), iq+(the 3rd positive-sequence component instantaneous value of inductive current), id-(the second negative sequence component wink of inductive current
Duration) and iq-(the 3rd negative sequence component instantaneous value of inductive current).
During final loop controls, positive and negative busbar difference generates controlled quentity controlled variable idref (bus difference controller adjusts output), iq0+
(the 3rd positive-sequence component filter value of threephase load electric current), id0-(the second negative sequence component filter value of threephase load electric current), iq0-
(the 3rd negative sequence component filter value of threephase load electric current) and i0 (first zero-sequence component of threephase load electric current) are given control
Amount；I0* (the first zero-sequence component instantaneous value of inductive current), id+(the second positive-sequence component instantaneous value of inductive current), iq+(electricity
3rd positive-sequence component instantaneous value of inducing current), id-(the second negative sequence component instantaneous value of inductive current) and iq-(inductive current
3rd negative sequence component instantaneous value) it is feedback control amount, realize pi+ Repetitive controller.Because compensating the electric current of threephase load, giving will
Threephase load electric current is negated (consideration current sensor direction is equal positive direction).
Repetitive controller unit comes from the internal model principle in control theory, and internal model principle is the external signal the system that acts on
Kinetic model implant controller, to constitute a kind of design of high accuracy feedback control system.This principle is pointed out, if requiring one
The ability (stable state time error goes to zero) that individual feedback control system has good trace command and offsets disturbing influence, and
This regulation process to error is stable, then must comprise a description external input signal inside feedback control loop
The mathematical model of dynamicss.
It is exactly proportional plus integral control that pi controls, and pi controls and has a good robustness, dynamic property, but droop control,
Static difference can not be eliminated.The feature of Repetitive controller is can to eliminate static difference, but dynamic response is poor.Therefore this paper presents 5 rings
The control algolithm of the pi+ Repetitive controller on road, can take into account dynamic and stable state, be finally reached preferable compensation effect.Realize three-phase
Electric current and idle component response quickly, high-accuracy compensation, power factor 0.99, current unbalance factor is less than 5%.
The specific embodiment of the above is better embodiment of the present utility model, not limits this practicality with this new
Type be embodied as scope, scope of the present utility model includes being not limited to this specific embodiment, all according to this utility model
Shape, the equivalence changes made of structure are all in protection domain of the present utility model.
Claims (7)
1. a kind of control device for three-phase imbalance and reactive-load compensation is it is characterised in that include: threephase switch controls electricity
Road, filtration module and current sample module, described threephase switch control circuit is connected to electrical network by described filtration module, described
Threephase switch control circuit and filtration module are connected on a, b, c and n line of threephase load, and the three-phase of described threephase load is defeated
Go out electric current to connect to described filtration module by current sample module respectively.
2. the control device for three-phase imbalance and reactive-load compensation according to claim 1 is it is characterised in that described three
Phase ON-OFF control circuit is to be parallel to the t type three-level topology circuit of electrical network.
3. the control device for three-phase imbalance and reactive-load compensation according to claim 1 and 2 is it is characterised in that institute
State filtration module and include inductance l1, electric capacity c11, inductance l4, inductance l2, electric capacity c12, inductance l5, inductance l3, electric capacity c13 and electricity
Sense l6, one end of described inductance l4 connects to a line between electrical network and threephase load, the other end of described inductance l4 respectively with institute
The one end stating inductance l1 is connected with one end of electric capacity c11, and the other end of described inductance l1 connects to the control of described threephase switch
Circuit, the other end of described electric capacity c11 connects to the n line between electrical network and threephase load；One end of described inductance l5 connect to
B line between electrical network and threephase load, the other end of described inductance l5 respectively with one end of described inductance l2 and electric capacity c12 one
End is connected, and the other end of described inductance l2 connects to described threephase switch control circuit, and the other end of described electric capacity c12 connects
To the n line between electrical network and threephase load；One end of described inductance l6 connects to the c line between electrical network and threephase load, described
The other end of inductance l6 is connected with one end of described inductance l3 and one end of electric capacity c13 respectively, the other end of described inductance l3
Connect to described threephase switch control circuit, the other end of described electric capacity c13 connects to the n line between electrical network and threephase load.
4. the control device for three-phase imbalance and reactive-load compensation according to claim 3 is it is characterised in that described filter
Ripple module also includes Hall element h1, Hall element h2 and Hall element h3, and the other end of described inductance l4 passes through suddenly
Your sensor h1 connects to one end of described inductance l1；The other end of described inductance l5 is connected to described by Hall element h2
One end of inductance l2；The other end of described inductance l6 is connected by Hall element h3 to one end of described inductance l3.
5. the control device for three-phase imbalance and reactive-load compensation according to claim 3 is it is characterised in that described three
Phase ON-OFF control circuit includes switching tube sa1, switching tube sa2, switching tube sa3, switching tube sa4, switching tube sb1, switching tube sb2, open
Close pipe sb3, switching tube sb4, switching tube sc1, switching tube sc2, switching tube sc3, switching tube sc4, dc-link capacitance c1 and direct current female
Line capacitance c2；Described switching tube sa1Emitter stage, switching tube sa3Colelctor electrode and switching tube sa4Colelctor electrode be connected to institute
State inductance l1 one end away from inductance l4, described switching tube sa3Emitter stage connect to described switching tube sa2Emitter stage, described
Switching tube sa1Colelctor electrode connect to the positive pole of dc-link capacitance c1, described switching tube sa2Colelctor electrode connect female to direct current
N line between line capacitance c1 negative pole and dc-link capacitance c2 positive pole, described switching tube sa4Emitter stage connect to dc bus
The negative pole of electric capacity c2；Described switching tube sb1Emitter stage, switching tube sb3Colelctor electrode and switching tube sb4Colelctor electrode be connected to
Described inductance l2 is away from one end of inductance l5, described switching tube sb3Emitter stage connect to described switching tube sb2Emitter stage, institute
State switching tube sb1Colelctor electrode connect to the positive pole of dc-link capacitance c1, described switching tube sb2Colelctor electrode connect to direct current
N line between bus capacitor c1 negative pole and dc-link capacitance c2 positive pole, described switching tube sb4Emitter stage connect female to direct current
The negative pole of line capacitance c2；Described switching tube sc1Emitter stage, switching tube sc3Colelctor electrode and switching tube sc4Colelctor electrode all connect
It is connected to described inductance l3 one end away from inductance l6, described switching tube sc3Emitter stage connect to described switching tube sc2Transmitting
Pole, described switching tube sc1Colelctor electrode connect to dc-link capacitance c1 positive pole, described switching tube sc2Colelctor electrode connect to straight
N line between stream bus capacitor c1 negative pole and dc-link capacitance c2 positive pole, described switching tube sc4Emitter stage connect to direct current
The negative pole of bus capacitor c2.
6. the control device for three-phase imbalance and reactive-load compensation according to claim 5 is it is characterised in that described straight
Stream bus capacitor c1 one end respectively with described switching tube sa1Colelctor electrode, switching tube sb1Colelctor electrode and switching tube sc1Collection
Electrode is connected, the other end of described dc-link capacitance c1 respectively with described switching tube sa2Colelctor electrode, switching tube sb2Collection
Electrode and switching tube sc2Colelctor electrode be connected；One end of described dc-link capacitance c2 respectively with described switching tube sa4Send out
Emitter-base bandgap grading, switching tube sb4Emitter stage and switching tube sc4Emitter stage be connected, the other end of described dc-link capacitance c2 is respectively
With described switching tube sa2Colelctor electrode, switching tube sb2Colelctor electrode and switching tube sc2Colelctor electrode be connected.
7. the control device for three-phase imbalance and reactive-load compensation according to claim 1 and 2 is it is characterised in that institute
State the three-phase output current that current sample module gathers described threephase load respectively by current sensor.
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| CN201620744009.8U CN205901318U (en) | 2016-07-13 | 2016-07-13 | A controlling means for unbalanced three phase and reactive compensation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026140A (en) * | 2016-07-13 | 2016-10-12 | 深圳市泰昂能源科技股份有限公司 | Control device and method for three-phase unbalance and reactive power compensation |
| CN111030497A (en) * | 2019-12-12 | 2020-04-17 | 山东大学 | Three-phase four-leg inverter parallel system, control method thereof and electric energy management equipment |
| CN111224412A (en) * | 2018-11-23 | 2020-06-02 | 中车唐山机车车辆有限公司 | Micro-rail traffic power supply system, balancing device and control method thereof |
-
2016
- 2016-07-13 CN CN201620744009.8U patent/CN205901318U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026140A (en) * | 2016-07-13 | 2016-10-12 | 深圳市泰昂能源科技股份有限公司 | Control device and method for three-phase unbalance and reactive power compensation |
| CN111224412A (en) * | 2018-11-23 | 2020-06-02 | 中车唐山机车车辆有限公司 | Micro-rail traffic power supply system, balancing device and control method thereof |
| CN111030497A (en) * | 2019-12-12 | 2020-04-17 | 山东大学 | Three-phase four-leg inverter parallel system, control method thereof and electric energy management equipment |
| CN111030497B (en) * | 2019-12-12 | 2021-02-19 | 山东大学 | Three-phase four-leg inverter parallel system, control method thereof and electric energy management equipment |
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