CN106160258A - Many primary current of inductive electric energy transmission system and load voltage control method - Google Patents
Many primary current of inductive electric energy transmission system and load voltage control method Download PDFInfo
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- CN106160258A CN106160258A CN201610530491.XA CN201610530491A CN106160258A CN 106160258 A CN106160258 A CN 106160258A CN 201610530491 A CN201610530491 A CN 201610530491A CN 106160258 A CN106160258 A CN 106160258A
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Abstract
The invention discloses many primary current and the load voltage control method of a kind of inductive electric energy transmission system.Its main practice is, current signal centrifugal pump by primary coil k, the total current centrifugal pump of primary coil, the phase shift centrifugal pump of total current, the total current amplitude of primary coil is obtained by the quick active reactive Current Decomposition method not having phaselocked loop, the virtual watt current value of primary coil k and the virtual reactive current value of primary coil k are as the value of feedback of three pi regulators of this primary coil k, jointly act on through three pi regulators, realize fundamental voltage output of voltage amplitude and the regulation of phase place of the inverter of each primary coil k, finally make each primary coil k electric current with width homophase, make load voltage output constant.The hardware circuit of the method is simple, and algorithm complexity is low, and the value of feedback obtained is more accurate, and primary current is effective with phase control with width.
Description
Technical field
The present invention relates to many primary current and the load voltage control method of a kind of inductive electric energy transmission system.
Background technology
Induction electric energy transmission technology has been applied to rail transit train, electric automobile, implantable medical device etc..It with pass
System relies on the electric energy transmission technology that directly contacts of conductor to compare, the process of its transmission electric energy not by dirt, ice, hydrops and other
The impact of chemical substance, is not in contact with spark and contact wear problem, is effectively improved power supply safety reliability, have good
Good application prospect.
The structure of inductive electric energy transmission system with work process is: industrial-frequency alternating current becomes unidirectional current through rectifier rectification,
Unidirectional current is downconverted into the alternating current of high frequency in high-frequency inverter effect；The alternating current of high frequency excites high frequency magnetic on primary coil
?；Go out with frequency alternating voltage, warp with primary coil the secondary energy pick-up winding couples high frequency magnetic field induction that is not directly contacted with
The electrical energy changer crossing secondary circuit is transformed into the electrical energy form supply load needed for load, it is achieved the contactless biography of energy
Defeated.
In recent years, inductive electric energy transmission system is applied in public transport more and more, system capacity supply power supply palpus
Power to be provided to reach kVA up to a hundred or bigger.At tradition single inverter list primary coil as the scheme of energy supply side
Under, owing to the height in inverter is pressure, Gao Nailiu and high-frequency semiconductor device is fairly expensive or does not exist on market,
Therefore, the requirement of high-power power supply only cannot be realized by tradition single inverter list primary coil scheme.Use many primary coils
Electric power-feeding structure, a primary coil is separately configured a high-frequency inverter, is improved by the high frequency magnetic field superposition of each primary coil
The power grade of mains side energy supply, but owing to driving signal lag, the error of inductance capacitance device so that each inverter
Primary current size, there are differences between phase place, the power reduction causing secondary energy pick-up winding to obtain, reduce
The efficiency of transmission of inductive electric energy transmission system.
Summary of the invention
The many primary current and the load voltage that it is an object of the invention to provide a kind of inductive electric energy transmission system control
Method, the hardware circuit of the method is simple, and algorithm complexity is low, and the value of feedback obtained is more accurate, and electric current is with the same phase control of width
Effective, and the constant of load voltage can be kept, thus it is effectively improved the efficiency of transmission of inductive electric energy transmission system, and energy.
The technical solution adopted in the present invention is, many primary current of a kind of inductive electric energy transmission system and load electricity
Pressure control method, comprises the following steps:
Many primary current of a kind of inductive electric energy transmission system and load voltage control method, comprise the following steps:
A, current sampler, in system duty cycle T, collect current signal centrifugal pump i of primary coil kk
(tn)；Current signal centrifugal pump i by all of primary coil kk(tn) be added, obtain total current centrifugal pump i of primary coil
(tn)；The recycling phase shifter is by total current centrifugal pump i (tn) Phase delay 90 °, obtain the phase shift centrifugal pump i ' of total current
(tn)；
Wherein, tnIt is the sampling instant of a system duty cycle T n-th sampling, n=1,2,3 ..., N, N are one and are
The sampling total degree of current sampler in system working cycle T；K is the sequence number of primary coil, k=1,2,3 ..., K, K are primary
The sum of coil；
B, current signal centrifugal pump i of the primary coil k that A step is obtainedk(tn), total current centrifugal pump i (tn), total current
Phase shift centrifugal pump i ' (tn) input processor；Processor calculates: reference sine product centrifugal pump i of total currents(tn), is(tn)=
i(tn)·i(tn)；Reference sine product centrifugal pump i of primary coil ks k(tn),Primary coil k
Reference cosine amass centrifugal pump ic k(tn),
C, at sampling instant tn=tNTime, by reference sine product centrifugal pump i of the total current that B step obtainss(tn), primary line
Reference sine product centrifugal pump i of circle ks k(tn) and the reference cosine of primary coil k amass centrifugal pump ic k(tn), respectively through cutoff frequency
Rate is that the wave digital lowpass filter of ω/10 filters AC compounent, obtains reference sine product DC component i of total current accordinglyz, just
Level the virtual of coil k has work value PkVirtual Q without work value with primary coil kk；Wherein, ω is system operating frequency；
Reference sine product DC component i of the total current that D, processor obtain according to C stepz, primary coil k virtual meritorious
Value Pk, the virtual Q without work value of primary coil kk, calculate amplitude I of total current respectivelym,Primary coil k's is virtual
Watt current valueThe virtual reactive current value of primary coil k
E, the virtual reactive current value of the primary coil k that D is walkedPrimary coil k as pi regulator one is virtual idle
Current feedback signal, is set to 0, and then regulating by pi regulator one by the virtual reactive current set-point of pi regulator one
Virtual reactive current fault in enlargement to primary coil kAgain by virtual reactive current fault in enlargementAs pulse width modulator
Current in phase control signal input pulse width modulator, realize the inverter of primary coil k is exported electricity by pulse width modulator
The phase adjusted of pressure, thus the virtual reactive current value to primary coil kSuppress；
Meanwhile, the virtual watt current value of all primary coil k D step obtainedBeing averaged, it is empty to obtain primary coil
Intend watt current meansigma methodsAnd by virtual for primary coil watt current meansigma methodsRegulate as PI
The virtual watt current set-point of device two, by the virtual watt current value of the primary coil k that D walksVoid as pi regulator two
Intend watt current feedback signal, obtained the virtual watt current fault in enlargement of primary coil k by the regulation of pi regulator two
By the virtual watt current fault in enlargement of primary coil kDefault value U with load voltagerefIt is added, as
The load voltage set-point of pi regulator three；Voltage sample device is at tNThe load voltage values u that moment collects regulates as PI
The load voltage values feedback signal of device three, obtains next system duty cycle T primary coil k's by the regulation of PI controller three
The fundamental voltage output of voltage amplitude of inverter；Control to believe with width as the electric current of pulse width modulator using this fundamental voltage output of voltage amplitude again
Number input pulse width modulator, carries out same width control by pulse width modulator to the virtual watt current value of the inverter of primary coil k
System and load voltage Isobarically Control.
Compared with prior art, the invention has the beneficial effects as follows:
One, the quick active reactive Current Decomposition method by not having phaselocked loop obtains the total current amplitude, just of primary coil
The level virtual watt current value of coil k and the virtual reactive current value of primary coil k are as three PI regulation of this primary coil k
The value of feedback of device, acts on jointly through three pi regulators, it is achieved the fundamental voltage output of voltage amplitude of the inverter of each primary coil k
With the regulation of phase place, finally make each primary coil k electric current with width homophase, and make load voltage output constant；Make secondary energy
The power that amount pick-up winding obtains is maximum, improves the efficiency of transmission of inductive electric energy transmission system.
Two, the present invention could be used without the quick active reactive Current Decomposition method of phaselocked loop, decreases the complexity of algorithm；
Due to only need to measure the current signal centrifugal pump of primary coil k, the total current centrifugal pump of primary coil, total current phase shift discrete
Value, and measure current signal without using hardware circuit (Zero-cross comparator measures phase place, amplitude is measured in maximum detection) simultaneously
Amplitude and phase place, carry out active reactive Current Decomposition without by phase-locked link；Thus simplify hardware circuit, it is to avoid due to
Design of PLL is improper causes each inverter primary current with width with phase control poor effect；Its value of feedback obtained is more
Adding accurately, primary current is effective with phase control with width.
The present invention is described in further detail with detailed description of the invention below in conjunction with the accompanying drawings.
Accompanying drawing explanation
Fig. 1 is the load voltage u before the inductive electric energy transmission system of double primary coils uses the inventive method, at the beginning of two
Level coil current sum i, primary coil 1 electric current i2, primary coil 2 electric current i2Oscillogram.
Fig. 2 is the load voltage u after the inductive electric energy transmission system of double primary coils uses the inventive method, at the beginning of two
Level coil current sum i, primary coil 1 electric current i2, primary coil 2 electric current i2Oscillogram.
Detailed description of the invention
Embodiment
Many primary current of a kind of inductive electric energy transmission system and load voltage control method, comprise the following steps:
A, current sampler, in system duty cycle T, collect current signal centrifugal pump i of primary coil kk
(tn)；Current signal centrifugal pump i by all of primary coil kk(tn) be added, obtain total current centrifugal pump i of primary coil
(tn)；The recycling phase shifter is by total current centrifugal pump i (tn) Phase delay 90 °, obtain the phase shift centrifugal pump i ' of total current
(tn)；
Wherein, tnIt is the sampling instant of a system duty cycle T n-th sampling, n=1,2,3 ..., N, N are one and are
The sampling total degree of current sampler in system working cycle T；K is the sequence number of primary coil, k=1,2,3 ..., K, K are primary
The sum of coil；
B, current signal centrifugal pump i of the primary coil k that A step is obtainedk(tn), total current centrifugal pump i (tn), total current
Phase shift centrifugal pump i ' (tn) input processor；Processor calculates: reference sine product centrifugal pump i of total currents(tn), is(tn)=
i(tn)·i(tn)；Reference sine product centrifugal pump i of primary coil ks k(tn),Primary coil k
Reference cosine amass centrifugal pump ic k(tn),
C, at sampling instant tn=tNTime, by reference sine product centrifugal pump i of the total current that B step obtainss(tn), primary line
Reference sine product centrifugal pump i of circle ks k(tn) and the reference cosine of primary coil k amass centrifugal pump ic k(tn), respectively through cutoff frequency
Rate is that the wave digital lowpass filter of ω/10 filters AC compounent, obtains reference sine product DC component i of total current accordinglyz, just
Level the virtual of coil k has work value PkVirtual Q without work value with primary coil kk；Wherein, ω is system operating frequency；
Reference sine product DC component i of the total current that D, processor obtain according to C stepz, primary coil k virtual meritorious
Value Pk, the virtual Q without work value of primary coil kk, calculate amplitude I of total current respectivelym,Primary coil k's is virtual
Watt current valueThe virtual reactive current value of primary coil k
E, the virtual reactive current value of the primary coil k that D is walkedPrimary coil k as pi regulator one is virtual idle
Current feedback signal, is set to 0, and then regulating by pi regulator one by the virtual reactive current set-point of pi regulator one
Virtual reactive current fault in enlargement to primary coil kAgain by virtual reactive current fault in enlargementAs pulse width modulator
Current in phase control signal input pulse width modulator, realize the inverter of primary coil k is exported electricity by pulse width modulator
The phase adjusted of pressure, thus the virtual reactive current value to primary coil kSuppress；
Meanwhile, the virtual watt current value of all primary coil k D step obtainedBeing averaged, it is empty to obtain primary coil
Intend watt current meansigma methodsAnd by virtual for primary coil watt current meansigma methodsRegulate as PI
The virtual watt current set-point of device two, by the virtual watt current value of the primary coil k that D walksVoid as pi regulator two
Intend watt current feedback signal, obtained the virtual watt current fault in enlargement of primary coil k by the regulation of pi regulator two
By the virtual watt current fault in enlargement of primary coil kDefault value U with load voltagerefIt is added, as
The load voltage set-point of pi regulator three；Voltage sample device is at tNThe load voltage values u that moment collects regulates as PI
The load voltage values feedback signal of device three, obtains next system duty cycle T primary coil k's by the regulation of PI controller three
The fundamental voltage output of voltage amplitude of inverter；Control to believe with width as the electric current of pulse width modulator using this fundamental voltage output of voltage amplitude again
Number input pulse width modulator, carries out same width control by pulse width modulator to the virtual watt current value of the inverter of primary coil k
System and load voltage Isobarically Control.
Fig. 1 is that the inductive electric energy transmission system of double primary coils (the total K=2 of primary coil) uses side of the present invention
Load voltage u before method, two primary current sums i, primary coil 1 electric current i2, primary coil 2 electric current i2Oscillogram.
It will be seen from figure 1 that before not using the method for the present invention, load voltage u is constant at 100V, primary coil 1 electric current
i1With primary coil 2 electric current i2There is the situation that obvious amplitude does not waits and phase angle does not waits, primary coil 1 electric current i1With primary line
Enclose 2 electric current i2Difference icPeak-to-peak value size be 11A, primary coil 1 electric current i1Phase place and two primary current sum i phase places
Difference φ1It is 14.4 °, primary coil 2 electric current i2Phase place and difference φ of two primary current sum i phase places2Also it is 14.4 °.
Fig. 2 is the load voltage u before the inductive electric energy transmission system of double primary coils uses the inventive method, at the beginning of two
Level coil current sum i, primary coil 1 electric current i2, primary coil 2 electric current i2Oscillogram.
Figure it is seen that after using the method for the present invention, load voltage u is constant at 100V, primary coil 1 electric current i1
With primary coil 2 electric current i2Realize with the same phase control of width, primary coil 1 electric current i1With primary coil 2 electric current i2Difference icPeak-to-peak
Value size is 1A, primary coil 1 electric current i1Phase place, primary coil 2 electric current i2Phase place, two primary current sum i phase places one
Cause.
Claims (1)
1. many primary current of inductive electric energy transmission system and a load voltage control method, comprises the following steps:
A, current sampler, in system duty cycle T, collect current signal centrifugal pump i of primary coil kk(tn)；
Current signal centrifugal pump i by all of primary coil kk(tn) be added, obtain the total current centrifugal pump i (t of primary coiln)；Again
Utilize the phase shifter by total current centrifugal pump i (tn) Phase delay 90 °, obtain the phase shift centrifugal pump i ' (t of total currentn)；
Wherein, tnIt is the sampling instant of a system duty cycle T n-th sampling, n=1,2,3 ..., N, N are system works
Make the sampling total degree of current sampler in cycle T；K is the sequence number of primary coil, k=1,2,3 ..., K, K are primary coils
Sum；
B, current signal centrifugal pump i of the primary coil k that A step is obtainedk(tn), total current centrifugal pump i (tn), the shifting of total current
Phase centrifugal pump i ' (tn) input processor；Processor calculates: reference sine product centrifugal pump i of total currents(tn), is(tn)=i
(tn)·i(tn)；Reference sine product centrifugal pump i of primary coil ks k(tn),Primary coil k's
Centrifugal pump i is amassed with reference to cosinec k(tn),
C, at sampling instant tn=tNTime, by reference sine product centrifugal pump i of the total current that B step obtainss(tn), primary coil k
With reference to sine product centrifugal pump is k(tn) and the reference cosine of primary coil k amass centrifugal pump ic k(tn), respectively through cut-off frequency it is
The wave digital lowpass filter of ω/10 filters AC compounent, obtains reference sine product DC component i of total current accordinglyz, primary line
Circle the virtual of k has work value PkVirtual Q without work value with primary coil kk；Wherein, ω is system operating frequency；
Reference sine product DC component i of the total current that D, processor obtain according to C stepz, the virtual of primary coil k have work value Pk、
The virtual Q without work value of primary coil kk, calculate amplitude I of total current respectivelym,The virtual meritorious electricity of primary coil k
Flow valuve The virtual reactive current value of primary coil k
E, the virtual reactive current value of the primary coil k that D is walkedThe virtual reactive current of primary coil k as pi regulator one
Feedback signal, is set to 0 by the virtual reactive current set-point of pi regulator one, and then at the beginning of being obtained by the regulation of pi regulator one
The virtual reactive current fault in enlargement of level coil kAgain by virtual reactive current fault in enlargementElectricity as pulse width modulator
Stream homophase control signal input pulse width modulator, realizes the inverter output voltage to primary coil k by pulse width modulator
Phase adjusted, thus the virtual reactive current value to primary coil kSuppress；
Meanwhile, the virtual watt current value of all primary coil k D step obtainedIt is averaged and obtains that primary coil is virtual to be had
Merit current average And by virtual for primary coil watt current meansigma methodsAs pi regulator two
Virtual watt current set-point, by the virtual watt current value of the primary coil k that D walksVirtual as pi regulator two is gained merit
Current feedback signal, obtains the virtual watt current fault in enlargement of primary coil k by the regulation of pi regulator two
By the virtual watt current fault in enlargement of primary coil kDefault value U with load voltagerefIt is added, adjusts as PI
The load voltage set-point of joint device three；Voltage sample device is at tNThe load voltage values u that moment collects is as pi regulator three
Load voltage values feedback signal, obtained the inversion of next system duty cycle T primary coil k by the regulation of PI controller three
The fundamental voltage output of voltage amplitude of device；Again that this fundamental voltage output of voltage amplitude is defeated with width control signal as the electric current of pulse width modulator
Enter pulse width modulator, by pulse width modulator the virtual watt current value of the inverter of primary coil k carried out same width control and
Load voltage Isobarically Control.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114447928A (en) * | 2022-02-14 | 2022-05-06 | 湖南大学 | Cooperative fault ride-through control method of island microgrid based on dynamically reconfigurable virtual voltage reference unit |
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| DE102012205656A1 (en) * | 2012-04-05 | 2013-10-10 | Robert Bosch Gmbh | Wireless energy transfer |
| CN105471120A (en) * | 2016-01-11 | 2016-04-06 | 西南交通大学 | Constant current control and ring current inhibition method for inductive power transfer system provided with multiple inverters connected in parallel |
| CN105634150A (en) * | 2016-03-14 | 2016-06-01 | 西南交通大学 | Reactive power inhibition and constant voltage control method for inductive power transfer system |
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2016
- 2016-07-07 CN CN201610530491.XA patent/CN106160258B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012205656A1 (en) * | 2012-04-05 | 2013-10-10 | Robert Bosch Gmbh | Wireless energy transfer |
| CN105471120A (en) * | 2016-01-11 | 2016-04-06 | 西南交通大学 | Constant current control and ring current inhibition method for inductive power transfer system provided with multiple inverters connected in parallel |
| CN105634150A (en) * | 2016-03-14 | 2016-06-01 | 西南交通大学 | Reactive power inhibition and constant voltage control method for inductive power transfer system |
Non-Patent Citations (1)
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| 全恒立: "城市轨道交通混合式牵引供电装置关键技术与性能优化研究", 《中国博士学位论文全文数据库》 * |
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| CN114447928A (en) * | 2022-02-14 | 2022-05-06 | 湖南大学 | Cooperative fault ride-through control method of island microgrid based on dynamically reconfigurable virtual voltage reference unit |
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