CN105958667B - A kind of maximal efficiency point-tracking method of bidirectional radio energy Transmission system - Google Patents

A kind of maximal efficiency point-tracking method of bidirectional radio energy Transmission system Download PDF

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Publication number
CN105958667B
CN105958667B CN201610391224.9A CN201610391224A CN105958667B CN 105958667 B CN105958667 B CN 105958667B CN 201610391224 A CN201610391224 A CN 201610391224A CN 105958667 B CN105958667 B CN 105958667B
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primary
converter
radio energy
energy transmission
resonant
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CN105958667A (en
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谭林林
颜长鑫
黄学良
王维
刘瀚
郭金鹏
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Southeast University
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Southeast University
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J5/00Circuit arrangements for transfer of electric power between ac networks and dc networks
    • H02J5/005Circuit arrangements for transfer of electric power between ac networks and dc networks with inductive power transfer

Abstract

The present invention provides a kind of maximal efficiency point-tracking method of bidirectional radio energy Transmission system, and the resonant capacitance in bidirectional radio energy Transmission system primary side and primary side is replaced with vacuum adjustable condenser and is separately connected a stepper motor by this method;After bidirectional radio energy Transmission system reaches maximum transmitted efficiency, pass through the coaxial rotation of stepper motor and vacuum adjustable condenser when there is coupling coil dislocation, the capacitance of the corresponding vacuum adjustable condenser of adjustment, to adjust the resonant frequency of system resonance chamber, change simultaneously the switching frequency of both sides converter, keep the resonant frequency of the switching frequency resonant cavity of converter consistent, finally so that system frequency improves, to overcome the problems, such as that maximal efficiency declines.

Description

A kind of maximal efficiency point-tracking method of bidirectional radio energy Transmission system
Technical field
The present invention relates to wireless power transmission field, especially a kind of pressure point of maximum efficiency of bidirectional radio energy Transmission system Tracking.
Background technology
In bidirectional radio energy transmission field, interactive worth research is carried out between both sides with how realizing energy efficient. Occur at present such as using the method for low-loss material coiling resonance coil come lifting system efficiency.Meanwhile reasonable disposition is primary Side converter exit potential and primary side converter exit potential are also a kind of method of optimization system efficiency of transmission.But Under certain occasions, the coupling coil of both sides, which can misplace, to be reduced simultaneously so as to cause its coupling factor so that the efficiency of optimization It reduces.How bidirectional radio energy Transmission system pressure point of maximum efficiency urgently to be ground into line trace using simple and practicable method realization The method studied carefully, but do not occurred also to the solution of this problem at present.
Invention content
Goal of the invention:To solve to leading to its coupling because dislocation can occur for coupling coil in bidirectional radio energy Transmission system Conjunction factor reduces and so that the technical issues of efficiency of optimization reduces, a kind of bidirectional radio energy transmission of present invention offer system The maximal efficiency point-tracking method of system.
Technical solution:In order to solve the above technical problems, technical solution proposed by the present invention is:
A kind of maximal efficiency point-tracking method of bidirectional radio energy Transmission system, the bidirectional radio energy Transmission system Including the symmetrical primary side of topological structure and primary side;Primary side includes power supply I, controller I, converter I and the first LCL resonance Network;Primary side includes power supply II, controller II, converter II and the 2nd LCL resonant networks;In first LCL resonant networks The second resonant capacitance in first resonant capacitance and the 2nd LCL resonant networks is vacuum adjustable condenser, the first, second resonance The connection coaxial with the output end of the first, second stepper motor respectively of the adjustable side of capacitance, passes through stepper motor and vacuum adjustable electric The coaxial rotation of container adjusts the capacitance of corresponding vacuum adjustable condenser, to change the resonant frequency of system resonance chamber;It is described most Big efficiency point-tracking method includes step:
(1) controller for adjusting primary side and primary side, makes primary side and the output voltage amplitude phase of primary side converter It it is 90 ° Deng, phase difference;The efficiency of transmission in the bidirectional radio energy Transmission system reaches maximum value at this time, calculates transmission effect Rate maximum value;When primary side converter output voltage is ahead of primary side converter output voltage, the flow direction of electric energy is Primary side is to primary side;When primary side converter output voltage is ahead of primary side converter output voltage, the flowing of electric energy Direction is primary side to primary side.
(2) when coupling coil dislocation occurs in the bidirectional radio energy Transmission system, pass through the first, second stepper motor Adjust the capacitance of the first, second resonant capacitance so that the efficiency of transmission in the bidirectional radio energy Transmission system is maintained at Calculated efficiency of transmission maximum value in step (1);
(3) while step (2) carry out, the switch of both sides converter is adjusted by the controller of primary side and primary side The resonant frequency of frequency, the switching frequency for making both sides converter and resonant cavity in the bidirectional radio energy Transmission system keeps one It causes.
Further, the converter I and converter II is unidirectional full-bridge variable ratio frequency changer converter.
Further, the method for the output voltage amplitude of adjusting primary side and primary side converter is in the step (1):
By adjusting the output electricity of the driving pulse angle overlap control primary side converter I exported of controller I in primary side Pressure amplitude value;
By adjusting the output of the driving pulse angle overlap control primary side converter II exported of controller II in primary side Voltage magnitude keeps it equal with the output voltage amplitude of primary side converter I, and phase difference is 90 °.
Advantageous effect:Compared with prior art, method provided by the invention has at bidirectional radio energy Transmission system When maximum transmitted efficient point, the method that the resonant capacitance by adjusting both sides improves the resonant frequency of system overcomes due to line The problem of system maximal efficiency reduces caused by the uncertainties such as circle dislocation.This method is simple and practicable, and has compensation precision High feature can realize the quick tracking of bidirectional radio energy Transmission system maximum power point.
Description of the drawings
Fig. 1 is bidirectional radio energy Transmission system topological diagram;
Fig. 2 is stepper motor and vacuum tunable capacitor coaxial construction figure;
Fig. 3 is vacuum tunable capacitor capacitance curve graph.
Specific implementation mode
The present invention is further described below in conjunction with the accompanying drawings.
The present invention provides a kind of maximal efficiency point-tracking method of bidirectional radio energy Transmission system, is as shown in Figure 1 double To radio energy transmission system topological diagram, which includes the symmetrical primary side of topological structure and primary side;Wherein, primary side packet Include power supply I, controller I, converter I and the first LCL resonant networks;Primary side include power supply II, controller II, converter II and 2nd LCL resonant networks.Converter I and converter II is unidirectional full-bridge variable ratio frequency changer converter, and converter I is by switching tube S1~S4 Composition, converter II are made of switching tube S5~S8;First LCL resonant networks include series resistance R1, R2, series inductance Lm, Resonant inductance L11 and resonant capacitance C1;2nd LCL resonant networks include series resistance R3, R4, series inductance Ln, resonant inductance L21 and resonant capacitance C2.Power supply I is connected by converter I with the first LCL resonant networks, and the break-make of switching tube S1~S4 is by controlling Device I controls processed;Power supply II is connected by converter II with the 2nd LCL resonant networks, and the break-make of switching tube S5~S8 is by controller II is controlled;Resonant capacitance C1, C2 are vacuum tunable capacitor, and the capacitance adjustable side of C1, C2 are electric with the first, second stepping respectively The coaxial connection of machine, as shown in Figure 2.
In the circuit topology of bidirectional radio energy Transmission system shown in FIG. 1, C1=C2=C, R1=R2=R3=R4= The frequency range of R, L1=L11=L21=L2=L, single-phase full bridge variable ratio frequency changer converter are fmin~fmax;Primary side and time The capacitance curve graph of the resonant capacitance of grade side is as shown in figure 3, variation range is Cmin~Cmax.The original resonance frequency of initialization system For f0, and meet fmin≤1/2πsqrt(LCmax)≤f01/2πsqrt(LCmin)≤≤fmax.The resonator of system both sides it is initial Coupling factor is k0, at this time the efficiency of transmission of system reach maximum.
The control principle of the present invention is as follows:
When the output voltage amplitude that the controller of both sides controls full-bridge variable ratio frequency changer converter is consistent, phase difference is when being 90 ° The efficiency of transmission of system is maximum, when primary side converter output voltage phase is ahead of primary side converter output voltage phase, The flow direction of electric energy is primary side to primary side;When to be ahead of primary side converter defeated for primary side converter output voltage phase When going out voltage-phase, the flow direction of electric energy is primary side to primary side.
The efficiency of transmission maximum value of system is:
Wherein:ηf-optMaximum transmitted efficiency when flowing to primary side from primary side for electric energy, ηi-optIt is electric energy from secondary effluent To maximum transmitted efficiency when primary side.Wherein, λ16C4M2R+ω4C4R32C2R, λ23C2M.M represent primary side and The mutual inductance of primary side coupling coil, ω are phase angular speed.
At this point, the maximal efficiency factor is λ21,
Wherein, k is the coupling factor of primary side and primary side, is by formula (2) approximate processing:
During energy is wirelessly transferred, when certain external factor causes coupling coil to misplace, the primary of system is utilized Side controller calculates coupling factor k at this timemis, in order to keep the maximal efficiency factor constant, necessarily have:
Correspondingly:
In formula, Q is the quality factor of coil, Q0For initial quality factor, Q0=2 π f0L/R;QmisTo occur outside certain Factor will the constant required quality factor of the maximal efficiency factor, Q in holding system when coupling coil being caused to misplacemis=2 π f1L/R.Due to kmis< k0< 1, therefore, Qmis> Q0, i.e., need to improve f at this time0To f1.It is calculated at this time using the controller of system Coupling factor kmis, and relevant parameter is input to simultaneously the controller of stepper motor, Driving Stepping Motor and vacuum adjustable electric Holding coaxial rotation reduces capacitance, promotes the resonant frequency of resonant cavity to f1.Wait for that the resonant frequency of both sides resonant cavity is stable at f1 When, then the switching frequency of both sides single-phase full bridge variable ratio frequency changer converter is adjusted simultaneously to f1, continue to complete the transmission of energy.
Based on above-mentioned control principle, the maximal efficiency point-tracking method of bidirectional radio energy Transmission system provided by the invention Steps are as follows for execution:
(1) controller for adjusting primary side and primary side, makes primary side and the output voltage amplitude phase of primary side converter It it is 90 ° Deng, phase difference;The efficiency of transmission in the bidirectional radio energy Transmission system reaches maximum value at this time, calculates transmission effect Rate maximum value;
(2) when coupling coil dislocation occurs in the bidirectional radio energy Transmission system, pass through the first, second stepper motor Adjust the capacitance of the first, second resonant capacitance so that the efficiency of transmission in the bidirectional radio energy Transmission system is maintained at Calculated efficiency of transmission maximum value in step (1);
(3) while step (2) carry out, the switch of both sides converter is adjusted by the controller of primary side and primary side The resonant frequency of frequency, the switching frequency for making both sides converter and resonant cavity in the bidirectional radio energy Transmission system keeps one It causes.
The above is only a preferred embodiment of the present invention, it should be pointed out that:For the ordinary skill people of the art For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered It is considered as protection scope of the present invention.

Claims (3)

1. a kind of maximal efficiency point-tracking method of bidirectional radio energy Transmission system, which is characterized in that the two-way radio Energy Transmission system includes the symmetrical primary side of topological structure and primary side;Primary side include power supply I, controller I, converter I and First LCL resonant networks;Primary side includes power supply II, controller II, converter II and the 2nd LCL resonant networks;First LCL is humorous The second resonant capacitance in the first resonant capacitance and the 2nd LCL resonant networks in vibrating network is vacuum adjustable condenser, the One, the adjustable side of the second resonant capacitance connection coaxial with the output end of the first, second stepper motor respectively, by stepper motor and The coaxial rotation of vacuum adjustable condenser adjusts the capacitance of corresponding vacuum adjustable condenser, to change the resonance of system resonance chamber Frequency;The maximal efficiency point-tracking method includes step:
(1) controller for adjusting primary side and primary side, keeps the output voltage amplitude of primary side and primary side converter equal, phase Potential difference is 90 °;The efficiency of transmission in the bidirectional radio energy Transmission system reaches maximum value at this time, and it is maximum to calculate efficiency of transmission Value;
(2) it when coupling coil dislocation occurs in the bidirectional radio energy Transmission system, is adjusted by the first, second stepper motor The capacitance of first, second resonant capacitance so that the efficiency of transmission in the bidirectional radio energy Transmission system is maintained at step (1) calculated efficiency of transmission maximum value in;
(3) when the resonant frequency of primary side and primary side resonant cavity is stable at f1When, pass through the controller of primary side and primary side The switching frequency for adjusting both sides converter, make the switching frequency of both sides converter with it is humorous in the bidirectional radio energy Transmission system The resonant frequency of chamber of shaking is consistent;f1When indicating coupling coil dislocation will in holding system the maximal efficiency factor it is constant required Resonant frequency.
2. a kind of maximal efficiency point-tracking method of bidirectional radio energy Transmission system according to claim 1, feature It is, the converter I and converter II are single-phase full bridge variable ratio frequency changer converter.
3. a kind of maximal efficiency point-tracking method of bidirectional radio energy Transmission system according to claim 1, feature It is, the method that the output voltage amplitude of primary side and primary side converter is adjusted in the step (1) is:
By adjusting the output voltage width of the driving pulse angle overlap control primary side converter I exported of controller I in primary side Value;
By adjusting the output voltage of the driving pulse angle overlap control primary side converter II exported of controller II in primary side Amplitude keeps it equal with the output voltage amplitude of primary side converter I, and phase difference is 90 °.
CN201610391224.9A 2016-06-03 2016-06-03 A kind of maximal efficiency point-tracking method of bidirectional radio energy Transmission system Active CN105958667B (en)

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CN107482918A (en) * 2016-12-23 2017-12-15 中南大学 A kind of electric power electric transformer based on plate condenser
CN106602579A (en) * 2016-12-27 2017-04-26 武汉大学 Wireless charging bidirectional energy transmission resonance compensating circuit and method
CN109391044B (en) * 2018-11-14 2021-06-01 中国矿业大学 Voltage stabilization comprehensive control system and method for inductive power transmission system

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CN103532249A (en) * 2012-07-06 2014-01-22 奥迪股份公司 Device for the inductive transmission of electric energy
CN104393623A (en) * 2014-11-27 2015-03-04 上海安费诺永亿通讯电子有限公司 Frequency locking method and system for magnetic resonance wireless charging system
CN105207375A (en) * 2015-10-30 2015-12-30 武汉大学 Combined plane dynamic wireless energy transmission transmitting coil device

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CN104393623A (en) * 2014-11-27 2015-03-04 上海安费诺永亿通讯电子有限公司 Frequency locking method and system for magnetic resonance wireless charging system
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