CN107425610A - Radio energy transmission system and control method based on energy resource system load compensation in parallel - Google Patents
Radio energy transmission system and control method based on energy resource system load compensation in parallel Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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- H02J7/025—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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Abstract
The invention discloses a kind of radio energy transmission system and control method based on energy resource system load compensation in parallel.It includes transmitting lateral coil and receives lateral coil, and emitting side also has transmitting side inverter；Launch side inverter connection wireless induction coil, launch and primary side compensation topology is inputted between side inverter and wireless induction coil；Receive lateral coil and rectifier is connected by secondary compensation topology, there are two DC converters being arranged in parallel the rear end of rectifier, and the alternating current sensed can be changed into direct current and be respectively super capacitor and charging battery module by two DC converters in parallel by rectifier.After said structure and method, it is that energy-storage system in parallel is powered pattern using wireless transmission method, dc source is transformed to high-frequency alternating current using side inverter is launched, inputs LCC S compensation topologies；The alternating current sensed is changed into direct current, is respectively super capacitor and charging battery module by two Buck converters in parallel by receiving side by a rectifier.
Description
Technical field
It is specifically a kind of to be mended based on energy resource system in parallel load the present invention relates to a kind of wireless power transmission technology
The radio energy transmission system and control method repaid.
Background technology
In high-power wireless electric energy transmits (Wireless power transfer, WPT) systematic difference, energy is loaded
Source system is mainly that single battery or super capacitor energy-storage equipment can carry out energy by wireless power transmission mode to it
Supplement, its main operational principle are：By obtaining DC voltage to Traction networks AC rectification, by individual event full-bridge inverter
High-frequency alternating current is transformed into, lateral coil is launched in alternating current input, produces the magnetic field of alternation.According to electromagnetic induction principle, receive
Lateral coil senses AC energy, so as to realize the non-contact transmission of electric energy.To meet load super capacitor or battery
Required by electricity, the high-frequency ac electric energy for sensing to obtain obtains direct current by rectifier rectification, then is adjusted by DC converter
Section, so as to realize that wireless power transmission energizes to energy storage load.It is electric compared to conventional wired connection pattern, high-power wireless
The less efficient of connection mode can be transmitted, therefore the efficiency of actual WPT system is improved by optimization design control, is
The key that the technology is further employed.
Two kinds of control methods of radio energy transmission system efficiency generally use in the prior art, one kind be as shown in figure 1,
Two adjustable links are controlled using two controllers.First, load voltage and electric current are detected, as super capacitor is born
Carry, the optimal load value R according to corresponding to systematic parameter calculates optimum efficiency operating pointeq-OPT, can with reference to formula (9) and (10)
Draw the dutycycle for receiving side controller output：
Then the load current I that will be detectedSCTransmitting side controller is transferred to by way of wireless telecommunications, according to negative
The power reguirements of load, as super capacitor needs constant-current charge, phase shifting angle control is carried out to inverter, so as to realize power reguirements.
By above-mentioned analysis, this control method needs emitting side and receiving side to communicate wirelessly, and communicates and deposit
Transmission delay, the bit error rate the problems such as, accuracy and reliability are relatively low in practical application.Meanwhile this method is directed to single energy storage
Load, the control for energy resource system in parallel are not designed.
Another method is as shown in Fig. 2 using launching side inverter and receiving side buck (or other DC convertings
Device).Using side controller regulation is launched, meet load supplying requirement.And receive side controller constantly regulate system input work
Rate, in the case where the system output power short time is constant, when system input power minimum, then realize system optimal efficiency
Control.Its specific control flow is as shown in Figure 3, it is assumed that in a short period of time, receiving side receiving power is certain value, i.e., defeated
Enter bearing power P0It is fixed.Constantly change the phase shifting angle of transmitting side inverter, increase input voltage or reduce input voltage,
So as to adjust input power, compare current time and last moment performance number, further adjust input voltage, until input work
Rate PinMinimum, that is, pressure point of maximum efficiency is tracked.
Above-mentioned pattern avoids the wireless telecommunications of receiving side and emitting side signal.But certain time is needed to complete
The tracking of optimum point, regular hour error be present, so as to cause the optimal working point of efficiency certain deviation to be present, it is difficult to
Reach optimal value.Also, due to the method using dynamic tracing, there is tracking point mistake, reliability is relatively low.
The content of the invention
It can be realized the technical problem to be solved in the present invention is to provide one kind and be wirelessly transferred output impedance regulation, system is high
Efficiency operation, reliability high radio energy transmission system and control method based on energy resource system load compensation in parallel.
In order to solve the above-mentioned technical problem, the wireless power transmission of the invention based on energy resource system load compensation in parallel
System, including positioned at the transmitting lateral coil of emitting side and the reception lateral coil positioned at receiving side, emitting side, which also has, to be used to send out
The dc source for penetrating side is transformed to the transmitting side inverter of high-frequency alternating current；The transmitting side inverter connection wireless induction line
Circle, launch and primary side compensation topology is inputted between side inverter and wireless induction coil；Receive lateral coil and pass through secondary compensation topology
Rectifier is connected, there are two DC converters being arranged in parallel, the exchange that rectifier will can sense in the rear end of rectifier
Electricity is changed into direct current and is respectively super capacitor and charging battery module by two DC converters in parallel.
The primary side compensation topology and secondary compensation topology are LCC-S compensation topologies.
The LCC-S compensation topologies circuit includes the emitting side internal resistance R for being sequentially connected in series settingL, compensation inductance LrAnd electricity
Hold CP, include the coil resistance R of emitting sideP, compensation inductance Lr, electric capacity CPBetween node and coil resistance RPFront end it
Between connect compensating electric capacity Cr, the electric capacity CPWith coil resistance RPBetween connect coil inductance LP, the receiving side has and coil
Inductance LPThe receiving side coil inductance L of mutual inductanceSAnd with receiving side coil inductance LSThe compensating electric capacity C being connected in seriesS, resistance
ReqWith coil resistance Rs。
A kind of control method of the radio energy transmission system based on energy resource system load compensation in parallel, including following step
Suddenly：
A, the selection of the receiving side compensating electric capacity of LCC-S compensation topologies is made to meet the condition of series resonance, i.e. ω2LSCS=
1, circuit is carried out equivalent；When meeting condition of resonance after equivalent, its value is expressed as shown below：
B, according to Norton equivalent theorem, voltage source and Lr、RLrThe circuit equivalent of series connection is current source and Lr、RLrElectricity in parallel
Road, current source output current size are
Due to RLrFor resonant inductance internal resistance, meet RLr<<ω Lr, when formula (3) is set up, first siding ring electric current is
Equivalent current source output current, approximation meet IP≈Iin′≈Uin/jωLr；
Purely resistive should be presented from whole circuit in terms of LCC type compensation topology inputs, its input impedance is expressed as
Convolution (14), above formula can abbreviation be
C, according to Circuit theory, L is worked asr、Cr、CP、LPWhen the three-terminal network of composition should meet formula (6), input impedance is real
Existing zero phase angle；
Input impedance now can be expressed as
According to the value of above-mentioned resonant element rule, the voltage gain for drawing LCC-S resonance compensations topology is
In the case of ignoring coil and resonant inductance Lr internal resistances, the voltage gain of resonance compensation topology can be reduced to
From above voltage gain formula, the H in resonant frequencyUIt can be approximated to be mutual inductance M and LrRatio, when equivalent
Resistance ReqDuring change, output voltage UoutMaintenance is defined steady state；
D, inverter output is regarded as voltage source, the Circuit theory analyzed with fundamental wave, wireless power transmission can be obtained
The system loss P of systemt, power output PoutIt is as follows with efficiency of transmission η
According to circuit topology form, loop matrix equation is listed below：
In above formula,
When resonance angular frequency is ω0And when meeting the condition of resonance shown in formula (6), impedance Z1、Z2、Z3Modulus value be zero,
With reference to above-mentioned condition of resonance, solution loop equation can obtain
Wherein, ξ=RLr(ω0M)2+(Req+RS)[(ω0Lr)2+RLrRP]
Acquired results in above formula are brought into efficiency expression formula (10), can using system effectiveness as
Equally, the expression formula that can also obtain power output is
Similarly, for the optimum control of system effectiveness, to efficiency expression formula (13) on loading ReqDerivation, obtain efficiency
Partial derivative expression formula：
Optimum resistance operating point R during maximal efficiency must be reachedeq-OPT
As the equivalent load R of regulation coupling coil outputeqNumerical value when, its another value is that optimal load can keep system
Efficiency is optimal working point, and ReqRegulation equivalent load conversion by way of；
E, in the case where constant pressure exports, when system works optimal load operating point, now corresponding power output
It is system optimal power points, i.e.,
Control system power output is the optimum point of system power, you can ensures that system effectiveness is optimal.
After said structure and method, it is that energy-storage system in parallel is powered pattern using wireless transmission method, utilizes
Dc source is transformed to high-frequency alternating current by transmitting side inverter, inputs LCC-S compensation topologies；Receiving side passes through a rectification
Device, the alternating current sensed is changed into direct current, is respectively super capacitor and battery mould by two Buck converters in parallel
Block is charged, and the output impedance for realizing WPT system using energy-storage system in parallel is adjusted, and solves battery/super capacitor mixing storage
The wireless charging scheme of energy system, realizes system high efficiency Operation at full power.
Brief description of the drawings
Fig. 1 is optimal load electric operation control circuit figure in the prior art；
Fig. 2 follows the trail of circuit diagram for maximal efficiency in the prior art；
Fig. 3 is maximal efficiency tracing program flow chart in the prior art；
Fig. 4 is the theory diagram of the present invention；
Fig. 5 is the circuit diagram of the present invention；
Fig. 6 is LCC-S type compensation topology circuit diagrams in the present invention；
Fig. 7 is LCC-S type compensation topology equivalent circuit diagrams in the present invention；
Fig. 8 is LCC-S type compensation topology isoboleses in the present invention.
Embodiment
Below in conjunction with the accompanying drawings with embodiment, to the present invention based on the wireless of energy resource system load compensation in parallel
Electric energy transmission system and control method are described in further detail.
As illustrated, the radio energy transmission system based on energy resource system load compensation in parallel of the present invention, including positioned at
The transmitting lateral coil of emitting side and the reception lateral coil positioned at receiving side, emitting side, which also has, to be used for the direct current of emitting side
Source is transformed to the transmitting side inverter of high-frequency alternating current；Launch side inverter connection wireless induction coil, transmitting side inverter and
Primary side compensation topology is inputted between wireless induction coil；Receive lateral coil and rectifier, rectifier are connected by secondary compensation topology
Rear end have two DC converters being arranged in parallel, the alternating current sensed can be changed into direct current and passed through by rectifier
Two DC converters in parallel are respectively super capacitor and charging battery module；Physical circuit is as shown in figure 5, emitting side control
Device open loop output inverter drive signal processed, receive side controller and believed according to the super capacitor of measurement and the voltage x current of battery
Number, calculate the switching device for handling the two-way DC/DC converters of closed-loop control two (equivalent to Buck circuits during charging) respectively.
Wherein, in the present embodiment, primary side compensation topology and secondary compensation topology are LCC-S compensation topologies；Uin/IinFor hair
Penetrate side input voltage, Lr/RLrFor emitting side series compensation inductance and its internal resistance, Cr/CPElectricity is compensated for emitting side parallel/series
Hold, RP(Rs)、LP(LS) emitting side (receiving side) coil resistance and inductance, CSFor receiving side series compensation capacitance, M is mutual inductance, tool
The structure of body is：LCC-S compensation topologies circuit includes the emitting side internal resistance R for being sequentially connected in series settingL, compensation inductance LrAnd electricity
Hold CP, include the coil resistance R of emitting sideP, compensation inductance Lr, electric capacity CPBetween node and coil resistance RPFront end it
Between connect compensating electric capacity Cr, the electric capacity CPWith coil resistance RPBetween connect coil inductance LP, the receiving side has and line
Enclose inductance LPThe receiving side coil inductance L of mutual inductanceSAnd with receiving side coil inductance LSThe compensating electric capacity C being connected in seriesS, resistance
ReqWith coil resistance Rs。
A kind of control method of the radio energy transmission system based on energy resource system load compensation in parallel, including following step
Suddenly：
A, the selection of the receiving side compensating electric capacity of LCC-S compensation topologies is made to meet the condition of series resonance, i.e. ω2LSCS=
1, then circuit shown in Fig. 5 can be equivalent to the equivalent circuit shown in Fig. 7 (a)；When meeting condition of resonance after equivalent, in figure, Zr
The Impedance of reflection of primary side is refracted to for secondary side, when meeting condition of resonance, its value is expressed as shown below：
B, the inverter in the present embodiment is voltage source inverter, output can Approximate Equivalent be voltage source, according to promise
Equivalent theorem, voltage source and L shown in Fig. 6r、RLrThe circuit equivalent of series connection is current source and Lr、RLrParallel circuit, such as Fig. 7 a
Shown, current source output current size is
Due to RLrFor resonant inductance internal resistance, meet RLr<<ω Lr, when formula (3) is set up, first siding ring electric current is
Equivalent current source output current, approximation meet IP≈Iin′≈Uin/jωLr；
In order that obtaining inverter exports less reactive power, inverter and line loss are reduced, is compensated from LCC types
Topological input sees that purely resistive should be presented in whole circuit, and its input impedance is expressed as
Convolution (14), above formula can abbreviation be
C, according to Circuit theory, L is worked asr、Cr、CP、LPWhen the three-terminal network of composition should meet formula (6), input impedance is real
Existing zero phase angle (ZERO PHASE ANGLE, ZPA)；
Input impedance now can be expressed as
According to the value of above-mentioned resonant element rule, the voltage gain for drawing LCC-S resonance compensations topology is
Designed for the ease of practical application, (think R in the case of ignoring coil and resonant inductance Lr internal resistancesP、RS、
RLr<<ωM、ωLr、Req), the voltage gain of resonance compensation topology can be reduced to
From above voltage gain formula, the H in resonant frequencyUIt can be approximated to be mutual inductance M and LrRatio, when equivalent
Resistance ReqDuring change, output voltage UoutMaintenance is defined steady state；
When D, considering the efficiency of transmission of coil, inverter output is regarded as voltage source, managed with the circuit of fundamental wave analysis
By the system loss P of radio energy transmission system can be obtainedt, power output PoutIt is as follows with efficiency of transmission η
According to circuit topology form, loop matrix equation is listed below：
In above formula,
When resonance angular frequency is ω0And when meeting the condition of resonance shown in formula (6), impedance Z1、Z2、Z3Modulus value be zero,
With reference to above-mentioned condition of resonance, solution loop equation can obtain
Wherein, ξ=RLr(ω0M)2+(Req+RS)[(ω0Lr)2+RLrRP]
Acquired results in above formula are brought into efficiency expression formula (10), can using system effectiveness as
Equally, the expression formula that can also obtain power output is
Similarly, for the optimum control of system effectiveness, to efficiency expression formula (13) on loading ReqDerivation, obtain efficiency
Partial derivative expression formula：
Optimum resistance operating point R during maximal efficiency must be reachedeq-OPT
As the equivalent load R of regulation coupling coil outputeqNumerical value when, its another value is that optimal load can keep system
Efficiency is optimal working point, and ReqRegulation equivalent load conversion by way of；
Under LCC-S compensation, coupling coil output has the characteristics of constant pressure, and this has two benefits；First, electric energy regulation dress
Put and adjusted under constant pressure bus, facilitate the design of control system；Second, when bearing power keeps constant, and rationally design work(
Rate can make the load of coupling coil output equivalent remain optimal；System efficiency optimization, while wireless charging system can so be kept
System can be also operated under rated condition.
E, in the case where constant pressure exports, when system works optimal load operating point, now corresponding power output
It is system optimal power points, i.e.,
Control system power output is the optimum point of system power, you can ensures that system effectiveness is optimal.
By it was verified that for energy resource system in parallel, the above method is practical.Meanwhile design system power
Rating number for system optimal power can also safeguards system always work at nominal case, contribute to the safety of system can
By Effec-tive Function.
Consider energy mix system of the load for super capacitor and battery, super capacitor charging requirement is usually that constant current is filled
Electricity, and battery in parallel can play a part of adjusting power output.Due to super capacitor constant-current charge, with charging voltage
Rise, the charge power linear rise of super capacitor, until system optimal power points.And battery absorbs dump power, both
Power, which is added, is equal to system optimal power, so as to ensure that system effectiveness is optimal.
For load compensation angle, super capacitor constant-current charge process, its equivalent resistance is：
After reception side rectifier being connected in parallel on due to battery and super capacitor, the equivalent inpnt resistance R of coupling coileqFor：
Req=Req_SC+Req_BAT (18)
The equivalent resistance of regulating cell can adjust the equivalent output resistance of coupling coil, be born so as to reach system optimal
Operating point is carried, and it is optimal to reach system effectiveness.The Buck of adjustment control battery dutycycle D2, set up following formula.
By the above method, transmitting side controller only needs open loop to provide stable square wave drive waveforms, receiving side control
Device processed does not need any signal of emitting side.Receiving side detects the voltage and current of super capacitor and battery, feeds back to receiving side
Controller.Compare super capacitor actual current ISCWith command value I*SC, adjusted by PI, obtain controlling the Buck of super capacitor
The control signal D of circuit1；According to super capacitor virtual voltage and its charge power of Current calculation PSC, with system nominal power
P*E(i.e. system optimal power) subtracts each other, and obtains the command value P of battery charge powerBAT, divided by battery virtual voltage UBAT, obtain
The command value I* of electric currentSC, comparative cell actual current IBATWith command value I*BAT, adjusted by PI, obtain controlling battery Buck
The control signal D of circuit2。
Claims (3)
1. a kind of radio energy transmission system based on energy resource system load compensation in parallel, including the transmitting side line positioned at emitting side
Circle and the reception lateral coil positioned at receiving side, it is characterised in that：The emitting side, which also has, to be used for the dc source of emitting side
It is transformed to the transmitting side inverter of high-frequency alternating current；The transmitting side inverter connection wireless induction coil, the emitting side are inverse
Become and primary side compensation topology is inputted between device and wireless induction coil；The reception lateral coil connects rectification by secondary compensation topology
There are two DC converters being arranged in parallel, the alternating current that the rectifier will can sense in device, the rear end of the rectifier
It is changed into direct current and is respectively super capacitor and charging battery module by two DC converters in parallel.
2. according to the radio energy transmission system based on energy resource system load compensation in parallel described in claim 1, its feature exists
In：The primary side compensation topology and secondary compensation topology are LCC-S compensation topologies.
3. according to the radio energy transmission system based on energy resource system load compensation in parallel described in claim 1, its feature exists
In：The LCC-S compensation topologies circuit includes the emitting side internal resistance R for being sequentially connected in series settingL, compensation inductance LrAnd electric capacity CP, also
Coil resistance R including emitting sideP, compensation inductance Lr, electric capacity CPBetween node and coil resistance RPFront end between connect mend
Repay electric capacity Cr, the electric capacity CPWith coil resistance RPBetween connect coil inductance LP, the receiving side have and coil inductance LPMutually
The receiving side coil inductance L of senseSAnd with receiving side coil inductance LSThe compensating electric capacity C being connected in seriesS, resistance ReqWith coil electricity
Hinder Rs。
A kind of control method of the radio energy transmission system based on energy resource system load compensation in parallel, it is characterised in that including
Following steps：
A, the selection of the receiving side compensating electric capacity of LCC-S compensation topologies is made to meet the condition of series resonance, i.e. ω2LSCS=1, it is right
Circuit carries out equivalent；When meeting condition of resonance after equivalent, its value is expressed as shown below：
B, according to Norton equivalent theorem, voltage source and Lr、RLrThe circuit equivalent of series connection is current source and Lr、RLrParallel circuit, electricity
Stream source output current size is
Due to RLrFor resonant inductance internal resistance, meet RLr<<ω Lr, when formula (3) is set up, first siding ring electric current is equivalent electric
Stream source output current, approximation meet IP≈Iin′≈Uin/jωLr；
Purely resistive should be presented from whole circuit in terms of LCC type compensation topology inputs, its input impedance is expressed as
Convolution (14), above formula can abbreviation be
C, according to Circuit theory, L is worked asr、Cr、CP、LPWhen the three-terminal network of composition should meet formula (6), zero phase is realized in input impedance
Angle；
Input impedance now can be expressed as
According to the value of above-mentioned resonant element rule, the voltage gain for drawing LCC-S resonance compensations topology is
In the case of ignoring coil and resonant inductance Lr internal resistances, the voltage gain of resonance compensation topology can be reduced to
From above voltage gain formula, the H in resonant frequencyUIt can be approximated to be mutual inductance M and LrRatio, work as equivalent resistance
ReqDuring change, output voltage UoutMaintenance is defined steady state；
D, inverter output is regarded as voltage source, the Circuit theory analyzed with fundamental wave, radio energy transmission system can be obtained
System loss Pt, power output PoutIt is as follows with efficiency of transmission η
According to circuit topology form, loop matrix equation is listed below：
In above formula,Work as resonant angle
Frequency is ω0And when meeting the condition of resonance shown in formula (6), impedance Z1、Z2、Z3Modulus value be zero, with reference to above-mentioned resonance bar
Part, solution loop equation can obtain
Wherein, ξ=RLr(ω0M)2+(Req+RS)[(ω0Lr)2+RLrRP]
Acquired results in above formula are brought into efficiency expression formula (10), can using system effectiveness as
Equally, the expression formula that can also obtain power output is
Similarly, for the optimum control of system effectiveness, to efficiency expression formula (13) on loading ReqDerivation, obtain the inclined of efficiency
Derivative expressions：
Optimum resistance operating point R during maximal efficiency must be reachedeq-OPT
As the equivalent load R of regulation coupling coil outputeqNumerical value when, it is that optimal load keeps system effectiveness as most to make its value
Excellent operating point, and ReqRegulation equivalent load conversion by way of；
E, in the case where constant pressure exports, when system works optimal load operating point, now corresponding power output is also to be
System optimal power point, i.e.,
Control system power output is the optimum point of system power, you can ensures that system effectiveness is optimal.
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