CN109194102A - A kind of control method inhibiting five phase current source type current transformer current harmonics - Google Patents
A kind of control method inhibiting five phase current source type current transformer current harmonics Download PDFInfo
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- CN109194102A CN109194102A CN201811082078.7A CN201811082078A CN109194102A CN 109194102 A CN109194102 A CN 109194102A CN 201811082078 A CN201811082078 A CN 201811082078A CN 109194102 A CN109194102 A CN 109194102A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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Abstract
The invention discloses a kind of control methods for inhibiting five phase current source type current transformer current harmonics, this method uses five phase full-bridge topologies, four effective vectors and a zero vector are filtered out in each switch periods, current harmonics can be significantly reduced, improve output current wave, save additional power quality controlling device, saves cost, operational efficiency is improved, guarantees the original current control accuracy of space vector pulse width modulation.The power angle that will not influence exchange side simultaneously, can guarantee that five phase isolated power networks operate under higher power factor state.
Description
Technical field
It is the present invention relates to a kind of control method of five phase current source type current transformers in five phase isolated power networks, in particular to a kind of
Inhibit the control method of five phase current source type current transformer current harmonics.
Background technique
In recent years, the problems such as energy shortages, environmental pollution, gets worse.Therefore, the new energy such as solar energy, wind energy, Hydrogen Energy
Development and utilization increasingly accelerate, new distribution type generation technology is also increasingly valued by people.It generates electricity in distributed grid-connected
In system, current transformer plays the role of essential interface between renewable energy transfer device and power grid, and becomes distribution
Extremely important component part in formula electricity generation system.In the low-pressure high-powers application such as the traction of new type power locomotive and naval vessel propulsion
Occasion uses multiphase system, and it is a kind of novel power that the requirement to each phase power device capacity is reduced by increasing the number of phases
Convert solution.Compared with traditional three-phase system, the major advantage of multiphase system has: polyphase machine output torque density is more
Height, torque ripple is lower, and operational reliability is high；The fluctuation of polyphase inverter DC bus current is smaller；Due to number of phases redundancy, have
Better fault-tolerant operation ability, can continue to run in phase shortage.
Compared to multi-phase voltage source type current transformer (VSC), multiphase current source type current transformer (CSC) has topological simple, function
Rate switching tube number it is few and directly series connection it is convenient, still can be with the current wave of outputting high quality in the lower situation of switching frequency
Shape, short circuit curve is reliable and the features such as meeting four quadrant running, particularly suitable for middle pressure high-power applications occasion.In petroleum
In the industries such as work, ship, cement, mining and metal and wastewater treatment, by the polyphase machine applied in these industrial circles
Variable frequency regulating speed control is carried out, can reach energy-saving purpose.
Compared with conventional three-phase system converter modulation strategy, five phase current source type current transformer modulation strategies are more complicated,
Current space vector is distributed in fundamental wave plane and triple-frequency harmonics plane, it is necessary to while considering fundamental wave and triple harmonic current reference
The synthesis of vector.Therefore, traditional three-stage process is also only used about five phase current source type current transformer associated modulation strategies at present
Modulation.This modulation system can make AC side of converter electric current have very big triple-frequency harmonics.
Summary of the invention
Purpose of the invention is to overcome the shortcomings in the prior art, provides a kind of based on space vector pulse width modulation
(SVPWM) inhibit the control method of five phase current source type current transformer current harmonics, this method saves additional power quality controlling
Device saves the cost and volume of system, improves power density and operational efficiency, and the current transformer output known to test
The inhibitory effect of current harmonics is significant, it is ensured that the control precision of current on line side.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of control method inhibiting five phase current source type current transformer current harmonics, simultaneously based on five phase current source type current transformers
Net rectifier, five phase current source type current transformers are connected to after points of common connection PCC by filter and are exchanged with five phase isolated power networks
Power；Wherein, five phase current source type current transformers form five phase full-bridge topologies by ten power switching modules, and five phase current source types become
Flow the common direct current side bus inductance L of DC side series connection of devicedcFor inhibiting the current fluctuation of DC side；The control method includes
Following steps:
Step S1: when each switch periods start, current transformer is independent using sample circuit acquisition five phase of points of common connection
Network voltage value VPCC, and by VPCCDigital quantity V after five phase Clarke coordinate transformsPCCαAnd VPCCβIt is sent to current transformer
Control module, by digital quantity VPCCαAnd VPCCβCarrying out polar coordinate transform obtains resultant vector in the angle theta of α β plane and α reference axis
(π of 0≤θ < 2), and using θ as reference vectorAngle；
Step S2: reference vector is calculated according to angle thetaThe sector at place thereby determines that synthesized reference vector is used
Four effective vectors (two big vector sum, two small vectors), and the value of angle theta is combined to determine action time of all vectors；
Step S3: optimize putting in order for effective vector, it is ensured that the number of switches acted during vectors switching is minimum, presses
A kind of zero vector of energy minimization switch motion number is selected from five kinds of zero vectors according to the sequence of effective vector；
Step S4: obtaining the duty cycle signals of switching tube, thus controls opening and turning off for converter switches pipe.
Compared with prior art, the beneficial effects brought by the technical solution of the present invention are as follows:
1. inhibiting five phase current source type output current of converter harmonic waves using based on space vector pulse width modulation in the present invention
Control method, by using two big vectors, two small vectors and a zero vector synthesized reference current phasor can be significant
Output current of converter harmonic wave is reduced, additional power quality controlling device is eliminated, saves cost, improves operation effect
Rate.Space vector pulse modulation method has the characteristics that modulate flexibility height and realization is convenient, and has good number
Change characteristic to control and handle convenient for later programmed.
2. inhibition current harmonics control strategy on the basis of space vector impulse modulation is not necessarily to, increase is additional electrically to be set
It applies, does not lag with real-time, the power factor of power grid will not be reduced.Meanwhile this method provides the space vector after optimization
Sequence reduces switch motion number, reduces the switching loss of system.
Detailed description of the invention
Fig. 1 is the topological structure of five phase current source type current transformers in the specific embodiment of the invention.
Fig. 2-1 be the present invention in five phase current source type current transformer space vectors fundamental wave plane distribution schematic diagram.
Fig. 2-2 be the present invention in five phase current source type current transformer space vectors triple-frequency harmonics plane distribution schematic diagram.
Fig. 3 is the vectors switching sequential schematic in the present invention.
Fig. 4-1 is five phase current source type AC side of converter current waveform schematic diagrames when traditional scheme is applied.
Fig. 4-2 is five phase current source type current transformer a phase output current wave schematic diagrames when traditional scheme is applied.
Fig. 4-3 is five phase current source type AC side of converter current waveform schematic diagrames when the present invention program applies.
Fig. 4-4 is five phase current source type current transformer a phase output current wave schematic diagrames when the present invention program applies.
Specific embodiment
The invention will be further described with reference to the accompanying drawing.
The topological structure of control method of the invention based on the five grid-connected rectifiers of phase current source type current transformer, as shown in Figure 1,
Its structure is specific as follows: five phase current source type current transformers 2 are connected to independent with five phases after points of common connection PCC by filter 1
Power grid exchanges power；Wherein, five phase current source type current transformers 2 form five phase full-bridge topologies, five phases by ten power switching modules
The common direct current side bus inductance L of DC side series connection of current source type converter 2dcFor inhibiting the current fluctuation of DC side.
The present invention is based on the control plans that space vector pulse width modulation inhibits five phase current source type output current of converter harmonic waves
Slightly, the specific method is as follows:
Step S1: when each switch periods start, current transformer is independent using sample circuit acquisition five phase of points of common connection
Network voltage value VPCC, and by VPCCDigital quantity V after five phase Clarke coordinate transformsPCCαAnd VPCCβIt is sent to current transformer
Control module, by digital quantity VPCCαAnd VPCCβCarrying out polar coordinate transform obtains resultant vector in the angle theta of α β plane and α reference axis
(π of 0≤θ < 2), and using θ as reference vectorAngle；
Step S2: reference vector is calculated according to angle thetaThe sector at place thereby determines that synthesized reference vector is used
Four effective vectors (two big vector sum, two small vectors), and the value of angle theta is combined to determine action time of all vectors；
Step S3: optimize putting in order for effective vector, it is ensured that the number of switches acted during vectors switching is minimum, presses
A kind of zero vector of energy minimization switch motion number is selected from five kinds of zero vectors according to the sequence of effective vector；
Step S4: obtaining the duty cycle signals of switching tube, thus controls opening and turning off for converter switches pipe.
The following are the more specific embodiments of the present invention:
In step S2: current transformer reference vectorPlace sector is according to reference vector and fundamental wave (α β) plane α reference axis
Angle theta determine, specific method of determination is as shown in Fig. 2-1.According to Clarke (Clarke) transformation matrix of multiphase system, fundamental wave
Plane and triple-frequency harmonics plane corresponding current component can indicate are as follows:
[iα iβ ix iy i0]T=C5[iwa iwb iwc iwd iwe]T (1)
In formula, iwa, iwb, iwc, iwdAnd iweRespectively refer to five phase PWM transient current of current transformer.iαAnd iβIndicate fundamental wave plane
Quadrature current component, ixAnd iyIndicate the quadrature current component of triple-frequency harmonics plane, i0Indicate zero-sequence current component.In five phases five
In line system, i0Equal to zero.Clarke transformation matrix C5Are as follows:
The space vector for being distributed in fundamental wave (α β) plane Yu triple-frequency harmonics (xy) plane can be obtained by formula (1) and (2), such as
Shown in table 1.
Table 1 is the five phase current source type current transformer space vectors that the present invention obtains
DC current size is expressed as Idc, the space vector in fundamental wave plane can be divided into two classes according to amplitude size:
Big vectorAmplitude is 0.76Idc, small vectorAmplitude is 0.47Idc.In fundamental wave plane,
Each sector internal reference vectorIt is synthesized by two big vector, two small vectors and a zero vector.By taking I sector as an example,
Ampere-second equilibrium equation are as follows:
In formula, TsThe sampling period is represented,Fundamental wave plane current reference vector is represented,It is flat to represent triple-frequency harmonics
Surface current reference vector.t1, t2, t3And t4Respectively refer to the action time that space vector is corresponded in formula (3).
The available fundamental wave of space vector distribution and triple harmonic current component in conjunction with shown in Fig. 2-1 and Fig. 2-2
With the relationship between 6 effective vector action times:
Coefficient matrices A in formula5Are as follows:
Therefore, effective vector action time can indicate are as follows:
In order to eliminate the third-harmonic component of five phase current source type output current of converter, need to guarantee triple-frequency harmonics plane
Upper current component is zero (iref,x=iref,y=0).According to formula (6) available corresponding vector action time:
In formula, fundamental wave Plane reference current component iref,αAnd iref,βIt can indicate are as follows:
M in formulaaFor modulation ratio, i.e. reference current peak value (Iref) with the ratio between DC bus current value (ma=Iref/Idc).It presses
According to method for normalizing, available current reference vector (is in the I of sector with sector initial space vector) folder
Angle:
θsπ/5 (9)=θ-(k-1)
In formula, k=1,2 ..., 10, corresponding ten sector I, II ..., X.Convolution (7) and (8) are available:
In step S3: according to identified four effective one zero vector of vector sum come resultant current reference vector, each
The corresponding 2 switching tubes conducting of space vector.Therefore, in order to reduce the switching loss of current transformer, need to optimize cutting for space vector
Sequence is changed, the number of switches acted in handoff procedure is reduced.Fig. 3 illustrates vectors switching sequence by taking the I of sector as an example.Switch suitable
Sequence: with small vectorFor start vector, the sequence of remaining effective vector follows switching quantity in a calculating cycle
The smallest principle, i.e.,Zero vector may be selectedAt this point, a calculating week
Phase switching quantity is 4.
According to Fig. 4-1 it can be seen that five phase current source type current transformers are when using traditional three-stage process modulation strategy, exchange
Electric current will appear serious current distortion.Fig. 4-2 is that current transformer a phase exports electric current.According to Fig. 4-3 it can be seen that when using proposition
Inhibition inhibit output current harmonics control method when, current transformer AC current waveform be in symmetrical five phases sine wave, guarantee
Space vector pulse width modulation original current control accuracy.Fig. 4-4 is that current transformer a phase exports electric current.It will not influence simultaneously
The power angle of net side can guarantee operation of power networks under a very high power factor state.
To sum up: proposed by the present invention that five phase current source type current transformers output electricity is inhibited based on space vector pulse width modulation
What the control method of stream harmonic wave can be convenient is applied in five phase PWM current source type converters, plays and inhibits five phases well
The effect of current source type converter output current harmonics.Additional power quality controlling equipment is saved, the cost of system is saved
With volume, power density and operational efficiency are improved, guarantees the control precision to current on line side.Be it is a kind of be worthy to be popularized it is novel
Converter control method.
The present invention is not limited to embodiments described above.Above the description of specific embodiment is intended to describe and say
Bright technical solution of the present invention, the above mentioned embodiment is only schematical, is not restrictive.This is not being departed from
In the case of invention objective and scope of the claimed protection, those skilled in the art may be used also under the inspiration of the present invention
The specific transformation of many forms is made, within these are all belonged to the scope of protection of the present invention.
Claims (2)
1. a kind of control method for inhibiting five phase current source type current transformer current harmonics, grid-connected based on five phase current source type current transformers
Rectifier, five phase current source type current transformers are connected to after points of common connection PCC by filter and exchange function with five phase isolated power networks
Rate；Wherein, current transformer forms five phase full-bridge topologies, the common direct current of DC side series connection of current transformer by ten power switching modules
Side bus inductance LdcFor inhibiting the current fluctuation of DC side；It is characterized in that, the control method the following steps are included:
Step S1: when each switch periods start, current transformer acquires five phase isolated power network of points of common connection using sample circuit
Voltage value VPCC, and by VPCCDigital quantity V after five phase Clarke coordinate transformsPCCαAnd VPCCβIt is sent to the control of current transformer
Module, by digital quantity VPCCαAnd VPCCβCarrying out polar coordinate transform obtains resultant vector in angle theta (0≤θ of α β plane and α reference axis
< 2 π), and using θ as reference vectorAngle；
Step S2: reference vector is calculated according to angle thetaThe sector at place thereby determines that four used by synthesized reference vector
A effective vector, and the value of combination angle theta determines the action time of all vectors；
Step S3: optimize putting in order for effective vector, it is ensured that the number of switches acted during vectors switching is minimum, according to having
A kind of zero vector of energy minimization switch motion number is selected in effect vector sequence from five kinds of zero vectors；
Step S4: obtaining the duty cycle signals of switching tube, thus controls opening and turning off for converter switches pipe.
2. a kind of control method for inhibiting five phase current source type current transformer current harmonics, feature exist according to claim 1
In four effective vectors include two big vector sum, two small vectors in step S2.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110071656A (en) * | 2019-05-10 | 2019-07-30 | 天津大学 | A kind of five phase current source type current transformer common-mode voltage suppressing methods |
| CN112886849A (en) * | 2019-11-29 | 2021-06-01 | 北京华航无线电测量研究所 | Output current harmonic suppression method for seven-phase current source type converter |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102969709A (en) * | 2012-10-30 | 2013-03-13 | 李军 | Method for judging three phase voltage vector space locations |
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2018
- 2018-09-17 CN CN201811082078.7A patent/CN109194102A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102969709A (en) * | 2012-10-30 | 2013-03-13 | 李军 | Method for judging three phase voltage vector space locations |
Non-Patent Citations (1)
| Title |
|---|
| MOHAMED A. ELGENEDY.ET AL: "A Space Vector PWM Scheme for Five-Phase Current-Source Converters", 《IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110071656A (en) * | 2019-05-10 | 2019-07-30 | 天津大学 | A kind of five phase current source type current transformer common-mode voltage suppressing methods |
| CN112886849A (en) * | 2019-11-29 | 2021-06-01 | 北京华航无线电测量研究所 | Output current harmonic suppression method for seven-phase current source type converter |
| CN112886849B (en) * | 2019-11-29 | 2022-08-16 | 北京华航无线电测量研究所 | Output current harmonic suppression method for seven-phase current source type converter |
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