CN104578454A - Novel single-phase load wireless electric energy transmission system and design method thereof - Google Patents
Novel single-phase load wireless electric energy transmission system and design method thereof Download PDFInfo
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- CN104578454A CN104578454A CN201510027122.4A CN201510027122A CN104578454A CN 104578454 A CN104578454 A CN 104578454A CN 201510027122 A CN201510027122 A CN 201510027122A CN 104578454 A CN104578454 A CN 104578454A
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Abstract
The invention discloses a novel single-phase load wireless electric energy transmission system and a design method thereof. A main circuit is divided into a sending part and a receiving part with an induction coupler as the boundary. The sending part comprises a direct-current power source, a high-frequency inverter, a primary side resonance compensation mechanism and an induction coupler primary side coil. The receiving part comprises an induction coupler secondary side coil, a secondary side resonance compensation mechanism, a matrix converter, a filter and a single-phase load. The direct-current power source is converted into high-frequency alternating current through the high-frequency inverter, the high-frequency alternating current is offset through the primary side resonance compensation mechanism and then is provided for the induction coupler primary side coil, the induction coupler secondary side coil picks up energy based on the electromagnetic induction principle and then provides power-frequency alternating current for the single-phase load through the matrix converter and the filter. The novel single-phase load wireless electric energy transmission system and the design method have the obvious advantages that the matrix converter directly carries out AC-AC converting without a middle rectification filtering link, and an improved SPWM hybrid modulation strategy successfully solves the problem that an existing matrix converter converts current difficultly.
Description
Technical field
The present invention relates to a kind of radio energy transmission system, be specifically related to a kind of New single-phase load wireless electric energy transmission system and method for designing thereof.
Background technology
The form that traditional wire delivery of electrical energy pattern is passed through directly to be connected between conductor transmits electric energy, but along with development and the progress of society, this drawback brought based on the contact powering mode of traditional theory is more and more obvious, as easily produced wearing and tearing, plug-in spark, not easy care etc., therefore, wireless power transmission (Wireless Power Transfer is called for short WPT) technology based on inductively principle is arisen at the historic moment.
Current wireless power transmission technology mainly realizes the wireless power of single-phase load, and this System Matrix Transformation device directly carries out ac-ac conversion, without the need to middle rectifying and wave-filtering link, but owing to adopting bidirectional switch, too increases the difficulty of the matrix converter change of current.In modulation strategy in the past, two gate poles of bidirectional switch share same drive singal, can cause serious voltage, current surge when two bidirectional switch actions of same brachium pontis are asynchronous, harm switching tube safety.For the deficiency of conventional modulated strategy, a kind of SPWM hybrid modulation stratgy of improvement is proposed, adopting decoupling zero timesharing driving method, the electric current and voltage overshoot concussion that a shared drive singal causes can be eliminated, and the polarity without the need to identifying load current can realize a step self-adaption commutation.
Summary of the invention
The present invention is directed to the deficiency that traditional single-phase load radio energy transmission system exists, propose a kind of New single-phase load wireless electric energy transmission system and method for designing thereof, this System Matrix Transformation device directly carries out ac-ac conversion, without the need to middle rectifying and wave-filtering link; Moreover the SPWM hybrid modulation stratgy of improvement, successfully solves the problem of matrix converter bidirectional switch change of current difficulty.
The object of the present invention is achieved like this, a kind of New single-phase load wireless electric energy transmission system, and concrete scheme is a kind of New single-phase load wireless electric energy transmission system, is that main circuit is divided into transmission and receives two parts by boundary with induction coupling.Transmitting portion comprises DC power supply, high-frequency inverter, Yuan Bian resonance compensation mechanism, induction coupling primary coil; Receiving unit comprises induction coupling secondary coil, secondary resonance compensation mechanism, matrix converter, filter and single-phase load.
DC power supply changes high-frequency alternating current into by high-frequency inverter, after the resonance compensation of former limit, be supplied to induction coupling primary coil, induction coupling secondary coil based on after electromagnetic induction principle interrogation energy again through matrix converter and filter for single-phase load provides industrial-frequency alternating current.
Described system take induction coupling as boundary, and primary coil and the secondary coil of induction coupling are not in contact with each other between the two, achieves electric energy from former limit to the wireless transmission of secondary.
Described matrix converter directly carries out ac-ac conversion, without the need to middle rectifying and wave-filtering link; Moreover the SPWM hybrid modulation stratgy of improvement solves the problem of matrix converter bidirectional switch change of current difficulty.
Described high-frequency inverter is voltage-type full-bridge inverter, and four power tubes adopt 180
0complementary conduction mode.
Described induction coupling primary coil is identical with secondary coil material.
Described Yuan Bian resonance compensation mechanism and secondary resonance compensation mechanism adopt series capacitor compensation and parallel capacitive compensation respectively.
Described matrix converter is made up of four bidirectional switchs, and each bidirectional switch is composed in series by two IGBT common emitters, and the control method of matrix converter adopts the SPWM hybrid modulation stratgy improved.
The method for designing of described a kind of New single-phase load wireless electric energy transmission system:
1) loss of bidirectional switch pipe is ignored, according to power conservation law, matrix converter and filter, single-phase load can be equivalent to a phase load, thus make main circuit be equivalent to the single-phase radio energy transmission system of a typical former limit series compensation, secondary shunt compensation.
2) by
calculate induction coupling secondary coil inductance
l s, then by
calculate secondary resonance compensation mechanism capacitance
c s, wherein
r eqit is the equivalent resistance of entering viewed from the input of matrix converter;
it is system high-frequency inverter operating angle frequency;
q ssecondary resonance compensation factor,
q sgenerally get 2 ~ 10.
3) according to system needs, if induction coupling primary coil inductance value
l pbe a fixed value, Ze Yuanbian resonance compensation mechanism capacitance
, wherein
mit is the mutual inductance value between the former sideline of induction coupling and induction coupling secondary coil.
Beneficial effect, owing to have employed such scheme, compared to traditional single-phase load radio energy transmission system, this System Matrix Transformation device directly carries out ac-ac conversion, without the need to middle rectifying and wave-filtering link; Moreover the SPWM hybrid modulation stratgy of improvement, successfully solves the problem of matrix converter bidirectional switch change of current difficulty.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is traditional single-phase load radio energy transmission system circuit diagram.
Fig. 3 is the structural representation of matrix converter.
Fig. 4 is matrix converter fundamental diagram.
Fig. 5 is the four-way switch driving figure of a brachium pontis.
Fig. 6 is SPWM hybrid modulation combinational logic figure.
Fig. 7 is induction coupling secondary coil voltage current simulations figure.
Fig. 8 is single-phase load output voltage analogous diagram.
Fig. 9 is single-phase load output voltage experimental waveform.
In figure, 1, DC power supply; 2, high-frequency inverter; 3, Yuan Bian resonance compensation mechanism; 4, induction coupling primary coil; 5, the former secondary mutual inductance of induction coupling; 6, induction coupling secondary coil; 7, secondary resonance compensation mechanism; 8, matrix converter; 9, filter; 10, single-phase load.
Specific embodiments
Embodiment 1: a kind of novel single-phase load radio energy transmission system is that main circuit is divided into transmission and receives two parts by boundary with induction coupling.Transmitting portion comprises DC power supply 1, high-frequency inverter 2, Yuan Bian resonance compensation mechanism 3, induction coupling primary coil 4; Receiving unit comprises induction coupling secondary coil 6, secondary resonance compensation mechanism 7, matrix converter 8, filter 9 and single-phase load 10.
Described system take induction coupling as boundary, and induction coupling primary coil 4 and induction coupling secondary coil 6 are not in contact with each other between the two, achieves electric energy from former limit to the wireless transmission of secondary.
Described matrix converter 8 directly carries out ac-ac conversion, without the need to middle rectifying and wave-filtering link; Moreover the SPWM hybrid modulation stratgy of improvement solves the problem of matrix converter 8 bidirectional switch change of current difficulty.
Described high-frequency inverter 2 is voltage-type full-bridge inverters, and four power tubes adopt 180
0complementary conduction mode.
Described induction coupling primary coil 4 is identical with induction coupling secondary coil 6 material.
Described Yuan Bian resonance compensation mechanism 3 and secondary resonance compensation mechanism 7 adopt series capacitor compensation and parallel capacitive compensation respectively, and object is to improve the output voltage of single-phase load 10 and the system frequency stability under single-phase load 10 surging condition.
Described matrix converter 8 is made up of four bidirectional switch pipes, and each bidirectional switch is composed in series by two IGBT common emitters, and the control method of matrix converter 8 adopts the SPWM hybrid modulation stratgy improved, and solves the problem of bidirectional switch change of current difficulty.
Described matrix converter 8 understands circuit working principle by the thought of the coupling that unhitches.The coupling that unhitches refers to supply voltage to be decomposed into and is greater than zero-sum and is less than 0 two voltages, controls respectively, finally two kinds of situations is combined, obtain complete matrix converter 8 operation principle in these two cycles to it.When matrix converter 8 is input as positive polarity high_frequency sine wave, the inverter of forward work is defined as and just organizes inverter.Otherwise, the inverter of negative sense work is defined as negative group inverter.
The SPWM hybrid modulation stratgy of the improvement that the present invention proposes can realize a step self-adaption commutation.It is below the design process of a phase brachium pontis logic realization circuit.
1) when matrix converter 8 is input as positive polarity high_frequency sine wave, trigger all switches of negative group inverter, just organizing inverter conveniently SPWM modulation system normally work.
2) when matrix converter 8 is input as negative polarity high_frequency sine wave, trigger all switches just organizing inverter, negative group inverter conveniently SPWM modulation system normally works.
Compared with positive and negative group of inverter alternate run of conventional SPWM modulation strategy, when main circuit runs according to above Controlling principle, positive and negative group of inverter runs according to following rapport: when wherein one group of inverter works, all switching tubes of another group inverter are all open-minded, serve as continuous current circuit.The Commutation Problem of such late-class circuit just becomes the Commutation Problem of ordinary inverter, realizes a step self-adaption commutation, effectively reduces change of current difficulty, reduces voltage, the current surge of switching tube.Matrix converter 8 fundamental diagram as shown in Figure 4.
For a phase brachium pontis of matrix converter 8, the implementation procedure of four-way switch drive singal is as follows: utilize sinusoidal modulation wave
u rand sawtooth waveforms
u c relatively obtain conventional SPWM signal and the SPWM1 of two-way complementation,
, be then the square wave of 0.5 by the SPWM signal of this two-way complementation and phase complements, duty ratio
,
carry out logical combination, square wave
,
with high-frequency inverter drive singal same frequency.So just can obtain four-way switch drive singal, waveform schematic diagram as shown in Figure 5.The sinusoidal modulation wave phase 180 of another brachium pontis
0, be not difficult to obtain the four-way switch drive singal of another brachium pontis by that analogy.The control law figure of an above-mentioned brachium pontis four-way switch drive singal as shown in Figure 6.
Definition
, SPWM1 is high level state when being " 1 ", otherwise low level.Definition matrix converter 8 bidirectional switch function S
1j:
(1)
The logic true value table table 1 of circuit is listed according to above-mentioned Controlling principle.
The logical expression of matrix converter 8 one phase brachium pontis drive singal can be drawn by table 1:
(2)
Be not difficult to obtain the control law of another phase brachium pontis drive singal of gust converter 8 thus.The SPWM hybrid modulation stratgy improved is simple and be easy to realize, and only need carry out suitable logical combination to common SPWM and can realize driving matrix converter 8 decoupling zero timesharing, and can realize the change of current of self adaptation one step.
For the design of Fig. 1 system parameters, the resistance of known single-phase load, output voltage, power are respectively
r 0,
u 0,
p 0if equivalent resistance, voltage, power that matrix converter 8 is entered viewed from input are respectively
r eq,
u i,
p i, wherein the input and output voltage of matrix converter 8 is effective value.Ignore the loss of switching tube, the principle equal according to matrix converter 8 input/output terminal power, has
, namely
(3)
Matrix converter 8 voltage carry-over factor is
, in formula
mfor the index of modulation, and definition
,
u rm,
u cmsine Modulated wave amplitude, sawtooth waveforms amplitude respectively.Obviously,
m≤ 1.When
mobtain maximum when=1, then the pass between the output voltage of matrix converter 8 and input voltage is
(4)
(4) formula is substituted into (3) formula obtain
(5)
Now main circuit just can be equivalent to a traditional former limit series compensation, the single-phase wireless power supply system of secondary shunt compensation.
By
calculate induction coupling secondary coil 6 inductance value
l sas follows:
(6)
In formula,
ωit is system high-frequency inverter 2 operating angle frequency;
q sfor secondary resonance compensation factor,
q sgenerally get 2 ~ 10, otherwise system can be caused unstable, occur many zero phases solution, also easily cause system to the sensitivity of electrical parameter.
By
calculate secondary resonance compensation mechanism 7 capacitance
c sas follows:
(7)
According to system needs, if induction coupling primary coil 4 inductance value
l pbe a fixed value, Ze Yuanbian resonance compensation mechanism 3 capacitance
c pas follows:
(8)
In formula
mit is the mutual inductance value between induction coupling primary coil 4 and induction coupling secondary coil 6.
Fig. 7 is induction coupling secondary coil 6 electric current and voltage analogous diagram, can find out that secondary coil electric current and voltage is similar to same-phase, achieve resonance, reduces the overshoot concussion of bidirectional switch.Fig. 8 is single-phase load 10 output voltage analogous diagram, and single-phase load 10 obtains industrial-frequency alternating current after device 9 filtering after filtering as seen.According to above-mentioned analysis, built Fig. 1 experiment porch, Sine Modulated wave frequency is 50Hz, and the switching frequency of high-frequency inverter 2 is 10kHz, and the switching frequency of matrix converter 7 is 20 kHz, and experimental waveform figure as shown in Figure 9.
Claims (6)
1. a New single-phase load wireless electric energy transmission system, it is characterized in that: this system is that main circuit is divided into transmission and receives two parts by boundary with induction coupling, and wherein transmitting portion comprises DC power supply, high-frequency inverter, Yuan Bian resonance compensation mechanism, induction coupling primary coil; Receiving unit comprises induction coupling secondary coil, secondary resonance compensation mechanism, matrix converter, filter and single-phase load; DC power supply changes high-frequency alternating current into by high-frequency inverter, after the resonance compensation of former limit, be supplied to induction coupling primary coil, induction coupling secondary coil based on after electromagnetic induction principle interrogation energy again through matrix converter and filter for single-phase load provides industrial-frequency alternating current; Described system take induction coupling as boundary, and primary coil and the secondary coil of induction coupling are not in contact with each other between the two, achieves electric energy from former limit to the wireless transmission of secondary; Described matrix converter directly carries out ac-ac conversion, without the need to middle rectifying and wave-filtering link; Moreover the SPWM hybrid modulation stratgy of improvement solves the problem of matrix converter bidirectional switch change of current difficulty.
2. a kind of New single-phase load wireless electric energy transmission system according to claim 1, is characterized in that: high-frequency inverter is voltage-type full-bridge inverter, and four power tubes adopt 180
0complementary conduction mode.
3. a kind of New single-phase load wireless electric energy transmission system according to claim 1, is characterized in that: induction coupling primary coil is identical with secondary coil material.
4. a kind of New single-phase load wireless electric energy transmission system according to claim 1, is characterized in that: Yuan Bian resonance compensation mechanism and secondary resonance compensation mechanism adopt series capacitor compensation and parallel capacitive compensation respectively.
5. a kind of New single-phase load wireless electric energy transmission system according to claim 1, it is characterized in that: matrix converter is made up of four bidirectional switchs, each bidirectional switch is composed in series by two IGBT common emitters, and the control method of matrix converter adopts the SPWM hybrid modulation stratgy improved.
6. the method for designing of a kind of New single-phase load wireless electric energy transmission system according to claim 1, it is characterized in that: the loss 1) ignoring bidirectional switch, according to power conservation law, matrix converter and filter, single-phase load can be equivalent to a phase load, thus make main circuit be equivalent to the single-phase radio energy transmission system of a typical former limit series compensation, secondary shunt compensation; 2) by
calculate induction coupling secondary coil inductance
l s, then by
calculate secondary resonance compensation mechanism capacitance
c s, wherein
r eqit is equivalent resistance of entering viewed from matrix converter input;
ωit is system high-frequency inverter operating angle frequency;
q ssecondary resonance compensation factor,
q sgenerally get 2 ~ 10; 3) according to system needs, if induction coupling primary coil inductance value
l pbe a fixed value, Ze Yuanbian resonance compensation mechanism capacitance
, wherein
mit is the mutual inductance value between induction coupling primary coil and induction coupling secondary coil.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105680576A (en) * | 2016-03-25 | 2016-06-15 | 中国矿业大学 | Novel wireless electric energy transmission system of single-phase load |
| CN109067005A (en) * | 2018-06-26 | 2018-12-21 | 上海航天设备制造总厂有限公司 | For rotating the contactless power supply device of electromechanical equipment |
| CN113746213A (en) * | 2021-08-19 | 2021-12-03 | 杭州电力设备制造有限公司 | Primary side frequency modulation control strong anti-deflection WPT device based on symmetrical PSSP compensation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105680576A (en) * | 2016-03-25 | 2016-06-15 | 中国矿业大学 | Novel wireless electric energy transmission system of single-phase load |
| CN109067005A (en) * | 2018-06-26 | 2018-12-21 | 上海航天设备制造总厂有限公司 | For rotating the contactless power supply device of electromechanical equipment |
| CN109067005B (en) * | 2018-06-26 | 2022-07-01 | 上海航天设备制造总厂有限公司 | Contactless power supply device for rotating electromechanical apparatus |
| CN113746213A (en) * | 2021-08-19 | 2021-12-03 | 杭州电力设备制造有限公司 | Primary side frequency modulation control strong anti-deflection WPT device based on symmetrical PSSP compensation |
| CN113746213B (en) * | 2021-08-19 | 2023-11-07 | 杭州电力设备制造有限公司 | Primary side frequency modulation control strong anti-offset WPT device based on symmetrical PSSP compensation |
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