CN107493025A - A kind of loaded self-adaptive change of current control method of Resonant DC Link three-phase inverter - Google Patents

A kind of loaded self-adaptive change of current control method of Resonant DC Link three-phase inverter Download PDF

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CN107493025A
CN107493025A CN201710749906.7A CN201710749906A CN107493025A CN 107493025 A CN107493025 A CN 107493025A CN 201710749906 A CN201710749906 A CN 201710749906A CN 107493025 A CN107493025 A CN 107493025A
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msub
mrow
current
switch pipe
pipe
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CN107493025B (en
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褚恩辉
李思
王晓标
王长凯
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Northeastern University China
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Northeastern University China
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/4826—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode operating from a resonant DC source, i.e. the DC input voltage varies periodically, e.g. resonant DC-link inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/4815—Resonant converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The present invention provides a kind of loaded self-adaptive change of current control method of Resonant DC Link three-phase inverter, and inverter includes converter circuit, inverter bridge, load circuit, control circuit and dc source；The operating frequency of converter circuit is reduced to the 1/6 of traditional carried-based PWM strategy by the inverter using the positive and negative alternate sawtooth carrier wave modulation strategy of slope；Loaded self-adaptive change of current control method is applied on the basis of the positive and negative alternate sawtooth carrier wave modulation strategy of slope, according to the switch time of the size dynamic regulation commutation switch pipe of load current, accurately realizes the soft handover of master power switch pipe.Present invention, avoiding the zero passage reverse procedure of change of current inductive current, extend the service life of inverter；Reduce the excessive action frequency of converter circuit and unnecessary time delay, effectively improve the DC bus-bar voltage utilization rate and efficiency of inverter.

Description

A kind of loaded self-adaptive change of current control method of Resonant DC Link three-phase inverter
Technical field
The present invention relates to inverter technology field, more particularly to a kind of load of Resonant DC Link three-phase inverter are adaptive Answer change of current control method.
Background technology
As inverter is in the extensive use of the numerous areas such as motor driving, uninterrupted power source, new-energy grid-connected, user Higher and higher requirement is proposed to performance indications such as its volume, weight, conversion efficiency, power densities, and realizes that inverter is small Type, lightweight, high efficiency, the most direct method of high power density are exactly to improve the switching frequency of inverter.But simple The switching loss of inverter can be increased again by switching frequency by improving, and bring serious electromagnetic interference (EMI) problem.Cause This, soft-switching inversion technology is arisen at the historic moment.
Soft switching inverter earliest by Univ Wisconsin-Madison USA D.M.Divan (enlightening ten thousand) doctors 1989 propose, Resonance circuit is located at direct current source in the topology proposed due to doctor Divan, therefore is called Resonant DC Link Sofe Switch Inverter.Resonant DC Link soft switching inverter realize inverter miniaturization, it is light-weighted simultaneously, also successfully reduce Switching loss and inhibit electromagnetic interference problem by way of reducing voltage change ratio dv/dt and current changing rate di/dt.
But traditional Resonant DC Link soft switching inverter generally existing switching device voltage stress is larger；Resonance potential Peak value is higher；Voltage over zero be difficult to inverter switching device method it is synchronous, make inverter export a large amount of harmonic waves the problems such as；To understand Certainly above mentioned problem, scholars both domestic and external propose parallel resonance DC link section soft switching inverter.But these parallel resonances DC link soft switching inverter there is also some problems, such as some loops resonant network need to set inductive current threshold value or Electric capacity precharge is carried out, realizes that Sofe Switch action brings difficulty in full-load range to circuit；Some loops use coupling Inductance, so as to add the volume of resonant DC link inverter, weight and cost；Contain Large Copacity electrolysis electricity in some loops Hold, so as to result in the problem of neutral point potential of inverter changes.
《Proceedings of the CSEE》The 12nd phase of volume 28 in 2008 discloses " motor driving New Type of Resonant DC Link Voltage source inverter ", the topological structure of the inverter are as shown in Figure 1.The converter circuit of the resonant DC link inverter includes Bus-tie circuit breaker pipe V1, two commutation switch pipe V2And V3, three assist exchanging circuit electric capacity C1、C2And Cr, 1 change of current inductance LrWith six Diode D1、D2、D3、D4、D5And D6.The inverter had both overcome that traditional PWM inverter switching loss is big, electromagnetic interference is serious Shortcoming, there is advantages below again：1. all switching tubes are no-voltage or Zero Current Switch；2. resonant element need not be set Dependent thresholds；3. the fly-wheel diode of inverter bridge is also soft switching, reverse-recovery problems are overcome；4. PWM can be realized. But the inverter still has weak point：1. the converter circuit of the inverter uses a change of current inductance, inductive current be present Zero passage reverse procedure, due to magnetic hysteresis, inductance coil can be allowed to produce magnetic hystersis loss and magnetic saturation, shorten inverter Service life；2. the inverter uses traditional carried-based PWM strategy, in a switch periods, to realize main power The soft handover of switching tube, converter circuit need action 6 times, and excessive action frequency can cause the big of DC bus-bar voltage utilization rate Width reduction steeply rises with converter circuit transmission loss；3. the inverter uses traditional control method of fixing time, unnecessary Time delay can further reduce the utilization rate of DC bus-bar voltage, while increase the transmission loss of converter circuit.
The content of the invention
The embodiment of the present invention provides a kind of loaded self-adaptive change of current control method of Resonant DC Link three-phase inverter, keeps away The zero passage reverse procedure of change of current inductive current is exempted from, has extended the service life of inverter, accurately realize the soft of master power switch pipe Switching.
The present invention provides a kind of loaded self-adaptive change of current control method of Resonant DC Link three-phase inverter, the resonance DC link three-phase inverter includes：Converter circuit, inverter bridge, load circuit, control circuit and dc source；
The converter circuit includes bus-tie circuit breaker pipe, the first commutation switch pipe, the second commutation switch pipe, first change of current electricity Sense, the second change of current inductance, main commutation capacitor, the first assist exchanging circuit electric capacity, the second assist exchanging circuit electric capacity, bus-tie circuit breaker pipe it is anti-simultaneously Di- pole pipe, the first booster diode, the second booster diode, the 3rd booster diode and the 4th booster diode；
The positive pole of the colelctor electrode connection dc source of bus-tie circuit breaker pipe, the emitter stage connection inverter bridge of bus-tie circuit breaker pipe；
The colelctor electrode of positive pole connection bus-tie circuit breaker pipe and the colelctor electrode of the first commutation switch pipe of main commutation capacitor, the main change of current The emitter stage of the negative pole connection bus-tie circuit breaker pipe of electric capacity；The emitter stage of first commutation switch pipe connects the one of the first change of current inductance End, the emitter stage of the other end connection bus-tie circuit breaker pipe of the first change of current inductance, the emitter stage connection direct current of the second commutation switch pipe The negative pole of power supply, the colelctor electrode of the second commutation switch pipe connect one end of the second change of current inductance, the other end of the second change of current inductance Connect the emitter stage of bus-tie circuit breaker pipe；
The negative electrode of first booster diode connects the emitter stage of the first commutation switch pipe, and the anode of the first booster diode connects Connect the negative pole of the first assist exchanging circuit electric capacity, the negative pole of the positive pole of the first assist exchanging circuit electric capacity and the second assist exchanging circuit electric capacity is all connected with The emitter stage of bus-tie circuit breaker pipe, the positive pole of the second assist exchanging circuit electric capacity connect the negative electrode of the second booster diode, the second auxiliary two The anode of pole pipe connects the colelctor electrode of the second commutation switch pipe；
The colelctor electrode of the negative electrode connection bus-tie circuit breaker pipe of 3rd booster diode, the anode connection the of the 3rd booster diode The positive pole of two assist exchanging circuit electric capacity, the anode of the 4th booster diode connect the emitter stage of the second commutation switch pipe, the 4th auxiliary The negative electrode of diode is connected to the negative pole of the first assist exchanging circuit electric capacity；
The anti-paralleled diode of bus-tie circuit breaker pipe anode connection bus-tie circuit breaker pipe emitter stage, bus-tie circuit breaker pipe it is anti-simultaneously The colelctor electrode of the negative electrode connection bus-tie circuit breaker pipe of di- pole pipe；
The inverter bridge is three phase inverter bridge, includes the first master power switch pipe, the first master power switch per phase inverter bridge The inverse parallel fly-wheel diode of pipe, the parallel connection buffer electric capacity of the first master power switch pipe, the second master power switch pipe, the second main work( The parallel connection buffer electric capacity of the inverse parallel fly-wheel diode of rate switching tube and the second master power switch pipe；Per first in phase inverter bridge The emitter stage of master power switch pipe connects the colelctor electrode of the second master power switch pipe, with the first master power switch pipe and the second main work( Lead-out wire at the tie point of rate switching tube is single-phase alternating current output end；The collection of first master power switch pipe of each phase inverter bridge Electrode is connected with each other, and as the anode of inverter bridge, the emitter stage of the second master power switch pipe of each phase inverter bridge is connected with each other, and is made For the negative terminal of inverter bridge；
The load circuit is that three-phase hinders inductive load, and resistance one end in threephase load connects three phase inverter bridge respectively Three single-phase alternating current output ends, at the same the phase current of three single-phase alternating current output ends output after sensor sample as defeated Enter signal difference input control circuit；
The negative terminal of the negative pole connection inverter bridge of the dc source, the positive pole connection converter circuit median generatrix of dc source are opened Close the colelctor electrode of pipe, the anode of the emitter stage connection inverter bridge of bus-tie circuit breaker pipe；
Each master power switch pipe in the bus-tie circuit breaker pipe, the first commutation switch pipe, the second commutation switch pipe and inverter bridge Gate pole be connected with existing control circuit, the signal control bus switching tube that is sent by control circuit, first change of current are opened Each master power switch pipe being opened and turning off in Guan Guan, the second commutation switch pipe and inverter bridge, while the output current phase of each phase As input signal difference input control circuit after sensor sample；
Replace traditional triangular wave as the modulation strategy of carrier wave to the resonance using the positive and negative alternate sawtooth waveforms of slope DC link three-phase inverter is modulated, and the operating frequency of converter circuit is reduced to the 1/ of traditional carried-based PWM strategy 6。
It is described using oblique in the loaded self-adaptive change of current control method of the Resonant DC Link three-phase inverter of the present invention The positive and negative alternate sawtooth waveforms of rate is specially as carrier wave instead of traditional triangular wave：
Traditional triangular carrier is replaced with the positive and negative alternate sawtooth carrier wave of slope, the size of the slope of sawtooth carrier wave is constant, The direction of the slope of sawtooth carrier wave changes with the direction of output current phase；The direction of output current phase for just, sawtooth carrier wave it is oblique The direction of rate is just；The direction of output current phase is negative, and the direction of the slope of sawtooth carrier wave is negative.
In the loaded self-adaptive change of current control method of the Resonant DC Link three-phase inverter of the present invention, control method tool Body is：
Opening for (1) second commutation switch pipe shifts to an earlier date T at the time of edge more vertical than sawtooth carrier wave is arrived constantlyaTime, second Bus-tie circuit breaker pipe turns off while commutation switch pipe is opened, and sawtooth carrier wave vertically closes along the second commutation switch pipe while arriving It is disconnected；Opening for first commutation switch pipe postpones T at the time of edge more vertical than sawtooth carrier wave is arrived constantlybTime, bus-tie circuit breaker pipe Open and postpone T at the time of edge more vertical than sawtooth carrier wave is arrived constantlycTime, the first commutation switch while bus-tie circuit breaker pipe is opened Pipe turns off；Each master power switch pipe of inverter bridge opens mode work according to SPWM (sinusoidal pulse width modulation), 180 ° of phase difference complementation Make；
(2) according to load current IoSize dynamic regulation time delay Ta、Tb、Tc, make DC bus-bar voltage be zero when The change of current moment of precisely master power switch pipe is carved, accurately realizes the soft handover of corresponding master power switch pipe.
In the loaded self-adaptive change of current control method of the Resonant DC Link three-phase inverter of the present invention, during the delay Between Ta、Tb、TcAnd load current IoThe condition of satisfaction is：
Wherein, ω2For the second resonance angular frequency, iLa2maxFor the second change of current inductance La2In the maximum current that flows through, iLa2 (t3) it is t3Moment second change of current inductance La2In electric current；E is direct current power source voltage value, CaFor the capacitance of main commutation capacitor, Cb For the capacitance of the first assist exchanging circuit electric capacity or the second assist exchanging circuit electric capacity, L is the first change of current inductance or the second change of current inductance Inductance value, ia、ib、icFor the output current phase of inverter A, B, C phase.
In the loaded self-adaptive change of current control method of the Resonant DC Link three-phase inverter of the present invention, time delay Ta、Tb、TcBy time delay Ta、Tb、TcCommand value generated compared with sawtooth carrier wave, by changing time delay Ta、Tb、Tc's The size of command value i.e. adjustable time delay Ta、Tb、Tc；Time delay Ta、Tb、TcCommand value be respectively：
Wherein, h is sawtooth carrier wave amplitude, TsFor switch periods.
In the loaded self-adaptive change of current control method of the Resonant DC Link three-phase inverter of the present invention, the bus is opened Each master power switch pipe in Guan Guan, the first commutation switch pipe, the second commutation switch pipe and inverter bridge, using full control derailing switch Part.
In the loaded self-adaptive change of current control method of the Resonant DC Link three-phase inverter of the present invention, the full control is opened Pass device is power transistor, insulated gate bipolar transistor, power field effect transistor, injection reinforced insulation grid crystal Pipe, integrated Gate Commutated Thyristor or SPM.
In the loaded self-adaptive change of current control method of the Resonant DC Link three-phase inverter of the present invention, the bus is opened The anti-paralleled diode of pass pipe, the first booster diode, the second booster diode, the 3rd booster diode, the 4th two poles of auxiliary The inverse parallel fly-wheel diode of each master power switch pipe is fast recovery diode or high-frequency diode in pipe and inverter bridge.
In the loaded self-adaptive change of current control method of the Resonant DC Link three-phase inverter of the present invention, the direct current Source is direct voltage source or the voltage source obtained by direct current DC-DC conversion rectifications.
The beneficial effects of the present invention are：Derailing switch in a kind of Resonant DC Link three-phase inverter proposed by the present invention Part is full control switching device, i.e. power transistor (GTR), insulated gate bipolar transistor (IGBT), power field effect crystal Manage (MOSFET), injection reinforced insulation gate transistor (IEGT), integrated Gate Commutated Thyristor (IGCT) or intelligent power mould Block (IPM), such on-off circuit can directly be controlled by control circuit；By using two change of current inductance, inductive current is avoided Zero passage reverse procedure, alleviate the magnetic hystersis loss of inductance coil and magnetically saturated problem, extend the service life of inverter； All full control switching devices realize soft handover, reduce switching loss；Converter circuit only works in a switch periods Once, the loss of DC bus-bar voltage and the transmission loss of converter circuit are significantly reduced, improves the dc bus of inverter Voltage utilization and efficiency；Inverter can be made according to the switch time of the size dynamic regulation commutation switch pipe of load current DC bus-bar voltage utilization rate and efficiency further lifted.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of existing motor driving Resonant DC Link voltage source inverter；
Fig. 2 is a kind of circuit theory diagrams for Resonant DC Link three-phase inverter that the embodiment of the present invention proposes；
Fig. 3 is Fig. 2 equivalent circuit diagram；
Fig. 4 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in traditional carried-based PWM Three phase inverter bridge switching signal schematic diagram under strategy；
Fig. 5 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in the positive and negative alternate sawtooth of slope Three phase inverter bridge switching signal schematic diagram under carrier modulation strategy；
Fig. 6 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in the positive and negative alternate sawtooth of slope Sawtooth carrier wave is vertically along preceding loop current view under carrier modulation strategy；
Fig. 7 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in the positive and negative alternate sawtooth of slope The vertical loop current view after of sawtooth carrier wave under carrier modulation strategy；
Fig. 8 is that a kind of Resonant DC Link three-phase inverter that the embodiment of the present invention proposes controls in the loaded self-adaptive change of current Feature work oscillogram under method；
Fig. 9 (a) is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in the loaded self-adaptive change of current The equivalent circuit diagram of change of current mode of operation 0 under control method：
Fig. 9 (b) is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in the loaded self-adaptive change of current The equivalent circuit diagram of change of current mode of operation 1 under control method：
Fig. 9 (c) is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in the loaded self-adaptive change of current The equivalent circuit diagram of change of current mode of operation 2 under control method：
Fig. 9 (d) is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in the loaded self-adaptive change of current The equivalent circuit diagram of change of current mode of operation 3 under control method：
Fig. 9 (e) is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in the loaded self-adaptive change of current The equivalent circuit diagram of change of current mode of operation 4 under control method：
Fig. 9 (f) is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in the loaded self-adaptive change of current The equivalent circuit diagram of change of current mode of operation 5 under control method：
Fig. 9 (g) is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in the loaded self-adaptive change of current The equivalent circuit diagram of change of current mode of operation 6 under control method：
Fig. 9 (h) is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in the loaded self-adaptive change of current The equivalent circuit diagram of change of current mode of operation 7 under control method：
Fig. 9 (i) is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in the loaded self-adaptive change of current The equivalent circuit diagram of change of current mode of operation 8 under control method：
Fig. 9 (j) is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in the loaded self-adaptive change of current The equivalent circuit diagram of change of current mode of operation 9 under control method：
Fig. 9 (k) is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in the loaded self-adaptive change of current The equivalent circuit diagram of change of current mode of operation 10 under control method：
Figure 10 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in loaded self-adaptive change of current control Slave pattern 0 under method processed arrives the DC bus-bar voltage v of pattern 10Cinv, the first change of current inductance La1In electric current iLa1Changed with second Flow inductance La2In electric current iLa2Operating principle oscillogram；
Figure 11 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in loaded self-adaptive change of current control Equivalent capacity C under method processedinvVoltage (DC bus-bar voltage) vCinvSimulation waveform；
Figure 12 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in loaded self-adaptive change of current control Bus current i under method processedbusSimulation waveform；
Figure 13 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in loaded self-adaptive change of current control The first change of current inductance L under method processeda1In electric current iLa1With the second change of current inductance La2In electric current iLa2Simulation waveform；
Figure 14 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in loaded self-adaptive change of current control Inverter bridge master power switch pipe S under method processed2Voltage v when openingS2With electric current iS2Simulation waveform；
Figure 15 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in loaded self-adaptive change of current control Inverter bridge master power switch pipe S under method processed2Voltage v during shut-offS2With electric current iS2Simulation waveform；
Figure 16 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in loaded self-adaptive change of current control Inverter bridge master power switch pipe S under method processed3Voltage v when openingS3With electric current iS3Simulation waveform；
Figure 17 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in loaded self-adaptive change of current control Inverter bridge master power switch pipe S under method processed3Voltage v during shut-offS3With electric current iS3Simulation waveform；
Figure 18 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in loaded self-adaptive change of current control Inverter bridge master power switch pipe S under method processed5Voltage v when openingS5With electric current iS5Simulation waveform；
Figure 19 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in loaded self-adaptive change of current control Inverter bridge master power switch pipe S under method processed5Voltage v during shut-offS5With electric current iS5Simulation waveform；
Figure 20 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in loaded self-adaptive change of current control The first commutation switch pipe S under method processeda1Voltage v when openingSa1With electric current iSa1Simulation waveform；
Figure 21 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in loaded self-adaptive change of current control The first commutation switch pipe S under method processeda1Voltage v during shut-offSa1With electric current iSa1Simulation waveform；
Figure 22 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in loaded self-adaptive change of current control The second commutation switch pipe S under method processeda2Voltage v when openingSa2With electric current iSa2Simulation waveform；
Figure 23 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in loaded self-adaptive change of current control The second commutation switch pipe S under method processeda2Voltage v during shut-offSa2With electric current iSa2Simulation waveform；
Figure 24 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in loaded self-adaptive change of current control Bus-tie circuit breaker pipe S under method processedLVoltage v when openingSLWith electric current iSLSimulation waveform；
Figure 25 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in loaded self-adaptive change of current control Bus-tie circuit breaker pipe S under method processedLVoltage v during shut-offSLWith electric current iSLSimulation waveform；
Figure 26 is that a kind of Resonant DC Link three-phase inverter that the embodiment of the present invention proposes is adjusted in traditional triangular carrier DC bus-bar voltage v in the next switch periods of system strategyCinvSimulation waveform；
Figure 27 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in the positive and negative alternate saw of slope DC bus-bar voltage v in the next switch periods of tooth carrier modulation strategyCinvSimulation waveform；
Figure 28 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in traditional control of fixing time Under method, as load current IoDC bus-bar voltage v during changeCinv, the first change of current inductance La1In electric current iLa1With second change of current Inductance La2In electric current iLa2Simulation waveform；
Figure 29 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in loaded self-adaptive change of current control Under method processed, as load current IoDC bus-bar voltage v during changeCinv, the first change of current inductance La1In electric current iLa1Changed with second Flow inductance La2In electric current iLa2Simulation waveform；
Figure 30 is a kind of Resonant DC Link three-phase inverter of proposition of the embodiment of the present invention in loaded self-adaptive change of current control Three-phase output current phase i under method processeda、ib、icSimulation waveform.
Embodiment
With reference to the accompanying drawings and examples, the embodiment of the present invention is described in further detail.Implement below Example can be used for the explanation present invention, but be not limited to the scope of the present invention.
A kind of Resonant DC Link three-phase inverter, as shown in Fig. 2 including converter circuit 1, inverter bridge 2, load circuit 3, Control circuit 4 and dc source E.
Converter circuit 1 includes bus-tie circuit breaker pipe SL, the first commutation switch pipe Sa1, the second commutation switch pipe Sa2, first change of current Inductance La1, the second change of current inductance La2, main commutation capacitor CL, the first assist exchanging circuit electric capacity Ca1, the second assist exchanging circuit electric capacity Ca2, it is female The anti-paralleled diode D of wiretap pipeL, the first booster diode Da1, the second booster diode Da2, the 3rd booster diode Da3 With the 4th booster diode Da4。
Inverter bridge 2 is three phase inverter bridge, including A phases inverter bridge, B phases inverter bridge and C phase inverter bridges.
A phases inverter bridge includes the first master power switch pipe S1, the first master power switch pipe inverse parallel sustained diode1、 The parallel connection buffer electric capacity C of first master power switch pipe1, the second master power switch pipe S2, the second master power switch pipe inverse parallel continue Flow diode D2With the parallel connection buffer electric capacity C of the second master power switch pipe2, the first master power switch pipe S1Emitter stage connection the Two master power switch pipe S2Colelctor electrode, with the first master power switch pipe S1With the second master power switch pipe S2Tie point at Lead-out wire is A cross streams electricity outputs end.
B phases inverter bridge includes the 3rd master power switch pipe S3, the 3rd master power switch pipe inverse parallel sustained diode3、 The parallel connection buffer electric capacity C of 3rd master power switch pipe3, the 4th master power switch pipe S4, the 4th master power switch pipe inverse parallel continue Flow diode D4With the parallel connection buffer electric capacity C of the 4th master power switch pipe4, the 3rd master power switch pipe S3Emitter stage connection the Four master power switch pipe S4Colelctor electrode, with the 3rd master power switch pipe S3With the 4th master power switch pipe S4Tie point at Lead-out wire is B cross streams electricity outputs end.
C phases inverter bridge includes the 5th master power switch pipe S5, the 5th master power switch pipe inverse parallel sustained diode5、 The parallel connection buffer electric capacity C of 5th master power switch pipe5, the 6th master power switch pipe S6, the 6th master power switch pipe inverse parallel continue Flow diode D6With the parallel connection buffer electric capacity C of the 6th master power switch pipe6, the 5th master power switch pipe S5Emitter stage connection the Six master power switch pipe S6Colelctor electrode, with the 5th master power switch pipe S5With the 6th master power switch pipe S6Tie point at Lead-out wire is C cross streams electricity outputs end.
Inverter bridge the first master power switch pipe S1, the 3rd master power switch pipe S3With the 5th master power switch pipe S5Current collection Pole is connected with each other, the anode as inverter bridge 2；Inverter bridge the second master power switch pipe S2, the 4th master power switch pipe S4With the 6th Master power switch pipe S6Emitter stage be connected with each other, the negative terminal as inverter bridge 2.
Load circuit 3 is that three-phase hinders inductive load, including first resistor Ra, second resistance Rb, 3rd resistor RcWith the first electricity Feel La, the second inductance Lb, the 3rd inductance Lc.First resistor Ra, second resistance Rb, 3rd resistor RcOne end connect A respectively and intersect Flow electricity output end, B cross streams electricity output ends and C cross streams electricity outputs end, first resistor Ra, second resistance Rb, 3rd resistor Rc's The other end connects the first inductance L respectivelya, the second inductance Lb, the 3rd inductance LcThe other end, the first inductance La, the second inductance Lb, Three inductance LcThe other end link together.A cross streams electricity outputs end, B cross streams electricity output ends and C cross streams electricity outputs simultaneously The output current phase i at enda、ibAnd icInput signal d is used as after sensor sampleia、dibAnd dicIt is respectively connected to control circuit 4.
The negative terminal of dc source E negative pole connection inverter bridge 2, dc source E positive pole connection bus-tie circuit breaker pipe SLCollection Electrode, bus-tie circuit breaker pipe SLEmitter stage connection inverter bridge 2 anode, the anti-paralleled diode D of bus-tie circuit breaker pipeLAnode connect Meet bus-tie circuit breaker pipe SLEmitter stage, the anti-paralleled diode D of bus-tie circuit breaker pipeLNegative electrode connection bus-tie circuit breaker pipe SLCurrent collection Pole.
Main commutation capacitor CLPositive pole connection bus-tie circuit breaker pipe SLColelctor electrode and the first commutation switch pipe Sa1Current collection Pole, main commutation capacitor CLNegative pole connection bus-tie circuit breaker pipe SLEmitter stage, the first commutation switch pipe Sa1Emitter stage connection the One change of current inductance La1One end, the first change of current inductance La1Other end connection bus-tie circuit breaker pipe SLEmitter stage, second change of current opens Close pipe Sa2Emitter stage connection dc source E negative pole, the second commutation switch pipe Sa2Colelctor electrode connect the second change of current inductance La2 One end, the second change of current inductance La2Other end connection bus-tie circuit breaker pipe SLEmitter stage.
First booster diode Da1Negative electrode connect the first commutation switch pipe Sa1Emitter stage, the first booster diode Da1 Anode connect the first assist exchanging circuit electric capacity Ca1Negative pole, the first assist exchanging circuit electric capacity Ca1Positive pole connect the second assist exchanging circuit Electric capacity Ca2Negative pole and bus-tie circuit breaker pipe SLEmitter stage, the second assist exchanging circuit electric capacity Ca2Positive pole connection second auxiliary two poles Pipe Da2Negative electrode, the second booster diode Da2Anode connect the second commutation switch pipe Sa2Colelctor electrode.
3rd booster diode Da3Negative electrode connection dc source E positive pole, the 3rd booster diode Da3Anode connection Second assist exchanging circuit electric capacity Ca2Positive pole, the 4th booster diode Da4Anode connection dc source E negative pole, the 4th auxiliary Diode Da4Negative electrode connect the first assist exchanging circuit electric capacity Ca1Negative pole.
Bus-tie circuit breaker pipe SL, the first commutation switch pipe Sa1, the second commutation switch pipe Sa2With each master power switch in inverter bridge Pipe Sx(x=1,2,3,4,5,6) is connected with existing control circuit 4, the signal d sent by control circuit 4SL、dSa1、dSa2、 dSx(x=1,2,3,4,5,6) difference control bus switching tube SL, the first commutation switch pipe Sa1, the second commutation switch pipe Sa2With it is inverse Become each master power switch pipe S in bridge 2x(x=1's, 2,3,4,5,6) turns on and off, while the output phase of A phases, B phases and C phases Electric current ia、ibAnd icInput signal d is used as after sensor sampleia、dibAnd dicIt is respectively connected to control circuit 4.
Bus-tie circuit breaker pipe SL, the first commutation switch pipe Sa1, the second commutation switch pipe Sa2With each master power switch in inverter bridge 2 Pipe Sx(x=1,2,3,4,5,6) controls switching device using complete, and power transistor, insulated gate can be used in specific embodiment Bipolar transistor, power field effect transistor, injection reinforced insulation gate transistor, integrated Gate Commutated Thyristor or intelligence Power model.
The anti-paralleled diode D of bus-tie circuit breaker pipeL, the first booster diode Da1, the second booster diode Da2, the 3rd auxiliary Diode Da3, the 4th booster diode Da4With the inverse parallel sustained diode of each master power switch pipe in inverter bridge 2x(x=1, 2,3,4,5,6) fast recovery diode or high-frequency diode can be used in specific implementation.
Resonant DC Link three-phase inverter in the present embodiment is applied to a variety of inversion occasions, in industrial production, traffic The fields such as transport, communication system, power system, new energy resources system, various power-supply systems, Aero-Space can play important work With.Below by taking its application in frequency conversion speed-adjusting system as an example, the Resonant DC Link three-phase inverter of the present embodiment is analyzed The course of work.
In the present embodiment, dc source E, which is used, will obtain relatively stable direct current after three-phase alternating current electric rectification, this is straight Stream electricity, which is input in the Resonant DC Link three-phase inverter other structures of the present embodiment proposition, carries out transformation of electrical energy, specific electric energy Conversion process is as shown below.
120 ° of phase mutual deviation between A, B, C three-phase for the Resonant DC Link three-phase inverter that the present embodiment proposes, A contraries Become the complementary conducting of 180 ° of electrical angles of phase mutual deviation of the first master power switch pipe and the second master power switch pipe of bridge, B phase inversions The complementary conducting of 180 ° of electrical angles of 3rd master power switch pipe of bridge and the phase mutual deviation of the 4th master power switch pipe, C phase inverter bridges The 5th master power switch pipe and the 6th master power switch pipe the complementary conducting of 180 ° of electrical angles of phase mutual deviation.Master power switch pipe Trigger signal be 180 ° of electrical angles of phase difference SPWM signals, in each phase inverter bridge during the master power switch pipe change of current, change of current electricity Road advancement, it is that the soft handover of each master power switch pipe in inverter bridge creates dc bus no-voltage groove, converter circuit moves Before work, the course of work of the inverter is identical with traditional hard switching three-phase bridge type converter course of work, each main work(of inverter bridge For rate switching tube after dc bus no-voltage groove completes soft handover, DC bus-bar voltage returns to direct current power source voltage, the change of current Journey is completed.
In order to further illustrate the operation principle of the Resonant DC Link three-phase inverter of the present embodiment proposition, equivalent electric is used Road Fig. 3 replaces Fig. 2.To simplify the analysis, it is assumed that：1. all devices are ideal operation state；2. the inductance for hindering inductive load is remote More than the first change of current inductance La1With the second change of current inductance La2, each master power switch pipe on off state transition wink in each phase inverter bridge Between load current be considered constant-current source Io, instantaneous value and inverter bridge 6 of its numerical value depending on the output current phase of each phase The on off state of master power switch pipe；It is 3. each master power switch pipe on off state transition moment in inverter bridge, each anti-in inverter bridge Fly-wheel diode equivalence value in parallel is Dinv；4. each parallel connection buffer capacitor equivalent value is C in inverterinv, take Cinv=3Cx(x= 1,2,3,4,5,6), wherein, Cx(x=1,2,3,4,5,6) the parallel connection buffer electric capacity C of the first master power switch pipe is represented1, second The parallel connection buffer electric capacity C of master power switch pipe2, the 3rd master power switch pipe parallel connection buffer electric capacity C3, the 4th master power switch pipe Parallel connection buffer electric capacity C4, the 5th master power switch pipe parallel connection buffer electric capacity C5Or the 6th master power switch pipe parallel connection buffer Electric capacity C6Capacitance.Because when two master power switch pipe any one party of each phase inverter bridge of inverter are opened, all make and its Buffering capacitance short-circuit in parallel, equivalent to 3 buffering electric capacity of electric capacity during normal work on 3 bridge arms are in parallel.
A kind of Resonant DC Link three-phase inverter that the present embodiment proposes is under traditional carried-based PWM strategy Three phase inverter bridge switching signal is less than zero, B in Fig. 4 as shown in figure 4, to be consistent with FIG. 5 below with A phases modulation wave signal Mutually it is illustrated with C phases modulation wave signal more than zero.Solid line in Fig. 4 in three phase inverter bridge switching signal represents each contrary Become the switching signal of master power switch pipe switching signal, i.e. the first master power switch pipe of A phases inverter bridge in the upper bridge arm of bridge, B The switching signal of 3rd master power switch pipe of phase inverter bridge, the switching signal of the 5th master power switch pipe of C phase inverter bridges；It is empty Line represents master power switch pipe switching signal in the lower bridge arm of each phase bridge arm, i.e., the second master power switch pipe in A phases inverter bridge Switching signal, the switching signal of the 4th master power switch pipe in B phase inverter bridges, the 6th master power switch pipe in C phase inverter bridges Switching signal.Traditional carried-based PWM strategy particular content is as follows：Converter circuit is respectively each master power switch of inverter bridge Dc bus no-voltage groove is created in each switching of pipe, after each master power switch pipe of inverter bridge completes soft handover, busbar voltage Direct current power source voltage is returned to, is apparent from according to SPWM principles, the operating frequency of converter circuit 1 is opened for each master power switch pipe of inverter bridge Close 6 times of frequency.
The carried-based PWM strategy of analysis conventional is understood：Each action of converter circuit can all produce on dc bus No-voltage groove, and the appearance of no-voltage groove then means the increase of the loss and transmission loss of DC bus-bar voltage.Passing Under the carried-based PWM strategy of system, converter circuit needs action 6 times to realize the soft handover of corresponding master power switch pipe, it is clear that So many action frequency can cause very big influence to the DC bus-bar voltage utilization rate and efficiency of inverter.Further divide Analysis understands that this 6 changes of current action can be divided into：The inverse parallel fly-wheel diode of 3 master power switch Guan Xiangtong bridge arm offsides changes Flowing is made and the change of current of 3 inverse parallel fly-wheel diodes to the master power switch pipe of same bridge arm offside acts, and latter of which can borrow The upper and lower bridge arm of inverter bridge buffering electric capacity in parallel is helped, realizes soft handover naturally.Therefore, if by 3 inverse parallel fly-wheel diodes Change of current action to the master power switch pipe of same bridge arm offside concentrates on synchronization, in this moment converter circuit integrating action one The secondary soft handover that corresponding master power switch pipe can be achieved, so as to which the DC bus-bar voltage utilization rate of inverter and effect be substantially improved Rate.
Analyzed based on more than, the present invention proposes a kind of replaces traditional triangular wave to make with the positive and negative alternate sawtooth waveforms of slope Above-mentioned Resonant DC Link three-phase inverter is modulated for the modulation strategy of carrier wave.A kind of resonance that the present embodiment proposes The three phase inverter bridge switching signal such as Fig. 5 of DC link three-phase inverter under the positive and negative alternate sawtooth carrier wave modulation strategy of slope It is shown.Solid line in Fig. 5 in three phase inverter bridge switching signal represents master power switch pipe in the upper bridge arm of each phase inverter bridge and switched The switching signal of first master power switch pipe of signal, i.e. A phases inverter bridge, the 3rd master power switch pipe of B phase inverter bridges are opened OFF signal, the switching signal of the 5th master power switch pipe of C phase inverter bridges；Dotted line represents main power in the lower bridge arm of each phase bridge arm The switching signal of second master power switch pipe in switching tube switching signal, i.e. A phases inverter bridge, the 4th main power in B phase inverter bridges The switching signal of switching tube, the switching signal of the 6th master power switch pipe in C phase inverter bridges.Due to needing according to output current phase Direction judge the direction of the slope of sawtooth carrier wave, therefore the present embodiment is negative using A phase output current phases, and B, C phase export mutually electricity Flow for just, i.e., A phases sawtooth carrier wave slope be bear, B phases and C phase sawtooth carrier wave slopes are just to be illustrated.It is positive and negative in slope Under alternate sawtooth carrier wave modulation strategy, a kind of Resonant DC Link three-phase inverter that the present embodiment proposes hangs down in sawtooth carrier wave Directly along preceding loop current state as shown in Figure 6, the loop current state in sawtooth waveforms vertically after it is as shown in Figure 7.Slope is just The particular content for bearing alternate sawtooth carrier wave modulation strategy is as follows：
Replacing traditional triangular wave using the positive and negative alternate sawtooth waveforms of slope, the size of the slope of sawtooth carrier wave is not as carrier wave Become, but the direction of the slope of sawtooth carrier wave changes with the direction of output current phase, and the direction of output current phase is just sawtooth carrier wave Slope direction for just, the direction of output current phase is negative, and the direction of the slope of sawtooth carrier wave is negative.Slope is positive and negative alternate The application of sawtooth carrier wave, inverse parallel fly-wheel diode (as shown in Figure 7) can be made in inverter bridge to the main power of same bridge arm offside The vertical edge of sawtooth carrier wave is concentrated at the time of switching tube (as shown in Figure 8) change of current, in sawtooth carrier wave vertically along front and rear change of current electricity Road acts, and realizes the soft handover of corresponding master power switch pipe.In this way, converter circuit need to only act once in a switch periods The soft handover of all master power switch pipes can be achieved, the operating frequency of converter circuit is reduced to traditional carried-based PWM strategy 1/6.
On the basis of the positive and negative alternate sawtooth carrier wave modulation strategy of slope, for the biography of commutation switch pipe switch time fixation The control method of fixing time of system, the present embodiment are proposed and a kind of can opened according to the size dynamic regulation commutation switch pipe of load current Close the loaded self-adaptive change of current control method of time.The loaded self-adaptive change of current control method and resonance that the present embodiment proposes are straight It is as shown in Figure 8 to flow feature work waveform of the link three-phase inverter under loaded self-adaptive change of current control method.Loaded self-adaptive The particular content of change of current control method is as follows：
1st, the second commutation switch pipe Sa2Open constantly it is more vertical than sawtooth carrier wave along arrive at the time of shift to an earlier date TaTime, second Commutation switch pipe Sa2Bus-tie circuit breaker pipe S while openingLShut-off, sawtooth carrier wave is vertically along the second commutation switch pipe while arriving Sa2Shut-off.First commutation switch pipe Sa1Open constantly it is more vertical than sawtooth carrier wave along arrive at the time of postpone TbTime, bus are opened Close pipe SLOpen constantly it is more vertical than sawtooth carrier wave along arrive at the time of postpone TcTime, bus-tie circuit breaker pipe SLWhile opening One commutation switch pipe Sa1Shut-off.Each master power switch pipe of inverter bridge according to SPWM (sinusoidal pulse width modulation), 180 ° of phase difference it is mutual Benefit is opened mode and worked.
2nd, according to load current IoSize dynamic regulation time delay Ta、Tb、Tc, DC bus-bar voltage is dropped to zero At the time of be precisely master power switch pipe the change of current moment, accurately realize the soft handover of corresponding master power switch pipe.Time delay Ta、Tb、TcAnd load current IoThe condition of satisfaction is：
Wherein, ω 2 is resonance angular frequency, and iLa2max is the maximum current flowed through in the second change of current inductance La2, iLa2 (t3) it is the electric current in t3 moment second change of current inductance La2；E is direct current power source voltage value, and Ca is the capacitance of main commutation capacitor, Cb is the capacitance of the first commutation capacitor or the second commutation capacitor, and L is the inductance value of the first change of current inductance or the second change of current inductance, Ia, ib, ic are the output current phase of inverter A, B, C phase.
3rd, time delay Ta、Tb、TcBy time delay Ta、Tb、TcCommand value generated compared with sawtooth carrier wave, pass through change Time delay Ta、Tb、TcCommand value size i.e. adjustable time delay Ta、Tb、Tc.According to above-mentioned (1), (2), (3), (4), (5), (6), (7) formula are understood, time delay Ta、Tb、TcCommand value be respectively：
Wherein, h is sawtooth carrier wave amplitude, TsFor switch periods.According to (8), (9), command value determined by (10) formula with Sawtooth carrier wave compares the time delay T of generation control commutation switch pipe switch timea、Tb、Tc。
A kind of Resonant DC Link three-phase inverter that the present embodiment proposes is under loaded self-adaptive change of current control method Feature work waveform is as shown in figure 8, wherein, vCinvRepresent equivalent capacity CinvVoltage (DC bus-bar voltage), ibusRepresent female Line current, iLa1And iLa2The first change of current inductance L is represented respectivelya1In electric current and the second change of current inductance La2In electric current.The inversion Commutation course of device includes 11 mode of operations, equivalent circuit diagram such as Fig. 9 (a) of 11 mode of operations to 9 (k) Suo Shi, its In dotted line represent be failure to actuate under associative mode, the pattern only includes the loop of solid line, below the change of current Working mould to loop Formula is made a concrete analysis of.
[~the t of pattern 00]：Equivalent circuit diagram as shown in Fig. 9 (a), t0Before moment, circuit is operated in stable state, and bus is opened Close pipe SL, bus-tie circuit breaker pipe anti-paralleled diode DLConducting, the first commutation switch pipe Sa1, the second commutation switch pipe Sa2Shut-off, ibus(t0)=Io.Load current IoAnti-paralleled diode D through bus-tie circuit breaker pipeLTo dc source feedback energy.When by postponing Time TaCommand value determine t0When moment arrives, bus-tie circuit breaker pipe S is turned offL, while open the second commutation switch pipe Sa2, mould Formula 0 terminates.
[the t of pattern 10~t1]：Equivalent circuit diagram as shown in Fig. 9 (b), in t0Moment, shut-off bus-tie circuit breaker pipe SL, simultaneously The second commutation switch pipe S is opened immediatelya2, due to the anti-paralleled diode D of bus-tie circuit breaker pipeLConducting, direct current power source voltage E are complete It is applied to the second change of current inductance La2On, the second change of current inductance La2In electric current iLa2Start from scratch linear rise, load current IoBy The anti-paralleled diode D of bus-tie circuit breaker pipeLTo the second change of current inductance La2The change of current.Second commutation switch pipe Sa2After opening, second changes Flow inductance La2In electric current iLa2Start from scratch linear rise, due to the second change of current inductance La2With the second commutation switch pipe Sa2String Connection, so the second commutation switch pipe Sa2Realize that ZCS (zero current) is open-minded.Due to bus-tie circuit breaker pipe SLBus-tie circuit breaker pipe it is anti-simultaneously Di- pole pipe DLTurned off during conducting, therefore bus-tie circuit breaker pipe SLRealize that ZVZCS (zero-voltage zero-current) is turned off.When second change of current electricity Feel La2In electric current iLa2Rise to load current IoWhen, the anti-paralleled diode D of bus-tie circuit breaker pipeLNaturally turn off, the knot of pattern 1 Beam.
[the t of pattern 21~t2]：Equivalent circuit diagram as shown in Fig. 9 (c), in t1Moment, the pole of inverse parallel two of bus-tie circuit breaker pipe Pipe DLShut-off, load current IoThe complete change of current is to the second change of current inductance La2, the second change of current inductance La2With main commutation capacitor CL, first Assist exchanging circuit electric capacity Ca1, equivalent capacity CinvStart resonance.First assist exchanging circuit electric capacity Ca1, equivalent capacity CinvElectric discharge, the main change of current Electric capacity CLCharging, the second change of current inductance La2In electric current iLa2Resonance rises.As equivalent capacity CinvVoltage (dc bus electricity Pressure) vCinvWhen dropping to zero, equivalent diode DinvOpen-minded, pattern 2 terminates.Now, the second change of current inductance La2In electric current iLa2 Reach maximum iLa2max。
[the t of pattern 32~t3]：Equivalent circuit diagram as shown in Fig. 9 (d), in t2At the moment, switch inverter bridge master power switch Pipe, while immediately turn off the second commutation switch pipe Sa2, due to equivalent diode DinvConducting, DC bus-bar voltage vCinvIt is zero, institute Realize that ZVS (no-voltage) switches with inverter bridge master power switch pipe.Second commutation switch pipe Sa2After shut-off, the second booster diode Da2It is open-minded, the second change of current inductance La2With the second assist exchanging circuit electric capacity Ca2Start resonance, the second change of current inductance La2In energy to Two assist exchanging circuit electric capacity Ca2Transfer, the second assist exchanging circuit electric capacity Ca2The voltage at both ends is started from scratch rising, by Kirchoff s voltage Law understands, now the second assist exchanging circuit electric capacity Ca2The voltage at both ends and the second commutation switch pipe Sa2The voltage at both ends is equal, therefore Second commutation switch pipe Sa2Realize that ZVS (no-voltage) is turned off.As the second assist exchanging circuit electric capacity Ca2When the voltage at both ends rises to E, Pattern 3 terminates.
[the t of pattern 43~t4]：Equivalent circuit diagram as shown in Fig. 9 (e), in t3Moment, the second assist exchanging circuit electric capacity Ca2Both ends Voltage rise to E, the 3rd booster diode Da3It is open-minded.Second change of current inductance La2Middle remaining energy passes through the second auxiliary two Pole pipe Da2, the 3rd booster diode Da3Feed back to dc source, the second change of current inductance La2In electric current iLa2It is linear to reduce.When Two change of current inductance La2In electric current iLa2When dropping to zero, the first commutation switch pipe Sa1Open-minded, pattern 4 terminates.
[the t of pattern 54~t5]：Equivalent circuit diagram as shown in Fig. 9 (f), in t4Moment, the first commutation switch pipe Sa1It is open-minded, Due to equivalent diode DinvConducting, direct current power source voltage E are entirely applied to the first change of current inductance La1On, the first change of current inductance La1 In electric current iLa1Start from scratch linear rise, load current IoBy equivalent diode DinvTo the first change of current inductance La1The change of current.The One commutation switch pipe Sa1After opening, the first change of current inductance La1In electric current iLa1Start from scratch linear rise, due to first change of current Inductance La1With the first commutation switch pipe Sa1Series connection, so the first commutation switch pipe Sa1Realize that ZCS (zero current) is open-minded.When first Change of current inductance La1In electric current rise to load current IoWhen, equivalent diode DinvNaturally turn off, pattern 5 terminates.
[the t of pattern 65~t6]：Equivalent circuit diagram as shown in Fig. 9 (g), in t5Moment, equivalent diode DinvShut-off, load Electric current IoThe complete change of current is to the first change of current inductance La1, the first change of current inductance La1With main commutation capacitor CL, the second assist exchanging circuit electric capacity Ca2, equivalent capacity CinvStart resonance.Main commutation capacitor CL, the second assist exchanging circuit electric capacity Ca2Electric discharge, equivalent capacity CinvCharging, the One change of current inductance La1In electric current iLa1Resonance rises.As equivalent capacity CinvVoltage (DC bus-bar voltage) vCinvRise to E When, pattern 6 terminates.Now, the first change of current inductance La1In electric current iLa1Reach maximum iLa1max。
Mode 7 [t6~t7]：Equivalent circuit diagram as shown in Fig. 9 (h), in t6Moment, bus-tie circuit breaker pipe SLIt is open-minded, simultaneously Immediately turn off the first commutation switch pipe Sa1, due to main commutation capacitor CLThe voltage at both ends is zero, so bus-tie circuit breaker pipe SLRealize ZVS (no-voltage) is open-minded.First commutation switch pipe Sa1After shut-off, load current IoThe change of current immediately is to bus-tie circuit breaker pipe SL, first Change of current inductance La1With the first assist exchanging circuit electric capacity Ca1Start resonance.First change of current inductance La1Middle energy is electric to the first assist exchanging circuit Hold Ca1Transfer, the first assist exchanging circuit electric capacity Ca1The voltage at both ends is started from scratch rising, from Kirchhoff's second law, this When the first assist exchanging circuit electric capacity Ca1The voltage at both ends and the second commutation switch pipe Sa1The voltage at both ends is equal, therefore first change of current is opened Close pipe Sa1Realize that ZVS (no-voltage) is turned off.As the first assist exchanging circuit electric capacity Ca1When being charged to E, the 4th booster diode Da4Lead Logical, mode 7 terminates.
[the t of pattern 87~t8]：Equivalent circuit diagram as shown in Fig. 9 (i), in t7Moment, the first assist exchanging circuit electric capacity Ca1Filled Electricity is to E, the 4th booster diode Da4Conducting.First change of current inductance La1Middle remaining energy passes through the first booster diode Da1, Four booster diode Da4, bus-tie circuit breaker pipe anti-paralleled diode DLFeed back to dc source, the first change of current inductance La1In electricity Flow iLa1It is linear to reduce.As the first change of current inductance La1In electric current iLa1Drop to load current IoWhen, bus-tie circuit breaker pipe it is anti-simultaneously Di- pole pipe DLNaturally turn off, pattern 8 terminates.
[the t of pattern 98~t9]：Equivalent circuit diagram as shown in Fig. 9 (j), in t8Moment, the pole of inverse parallel two of bus-tie circuit breaker pipe Pipe DLShut-off.First change of current inductance La1In electric current iLa1Continue linear reduction, load current IoFrom the first change of current inductance La1To mother Wiretap pipe SLThe change of current.As the first change of current inductance La1In electric current iLa1When dropping to zero, load current IoThe complete change of current is to bus Switching tube SL, pattern 9 terminates.
[the t of pattern 109~t10]：Equivalent circuit diagram as shown in Fig. 9 (k), this pattern are the stable state after change of current action. Dc source passes through bus-tie circuit breaker pipe SLPower to the load, now bus current ibus=-Io。
Because time delay Ta、Tb、TcCommand value determine the first commutation switch pipe Sa1, the second commutation switch pipe Sa2, it is female Wiretap pipe SLSwitch time, so at this to Ta、Tb、TcCommand value illustrate.In loaded self-adaptive change of current controlling party Under method, a kind of DC bus-bar voltage v for Resonant DC Link three-phase inverter that the present embodiment proposesCinv, the first change of current inductance La1In electric current iLa1With the second change of current inductance La2In electric current iLa2Slave pattern 0 arrives operating principle waveform such as Figure 10 of pattern 10 It is shown.Time delay T in Figure 10a、Tb、TcThe second change of current inductance L can be divided intoa2In electric current iLa2(the first change of current inductance La1In Electric current iLa1) linearly increasing time T11, linear reduce time T12With resonance rise time Tr1, resonance fall time Tr2。
The time t of pattern 10-1For the second change of current inductance La2In electric current iLa2Increase to load current I by zero linearoWhen Between, i.e., linearly increasing time T11=t0-1；The time t of pattern 54-5For the first change of current inductance La1In electric current iLa1By zero linear increasing It is added to load current IoTime, i.e., linearly increasing time T11=t4-5.The time t of pattern 43-4For the second change of current inductance La2In Electric current iLa2From t3Moment second change of current inductance La2In electric current iLa2(t3) linearly decrease to zero time, i.e., linearly reduce the time T12=t3-4；The time t of pattern 8+ patterns 97-8+t8-9For the first change of current inductance La1In electric current iLa1From t7The change of current of moment first electricity Feel La1In electric current iLa1(t7) linearly decrease to zero time, i.e., linearly reduce time T12=t7-8+t8-9。
The time t of pattern 21-2For the second change of current inductance La2In electric current iLa2By load current IoResonance rises to maximum iLa2maxTime, i.e. resonance rise time Tr1=t1-2；The time t of pattern 65-6For the first change of current inductance La1In electric current iLa1 By load current IoResonance rises to maximum iLa1maxTime, i.e. resonance rise time Tr1=t5-6.The time t of pattern 32-3 For the second change of current inductance La2In electric current iLa2From maximum iLa2maxResonance drops to t3Moment second change of current inductance La2In electricity Flow iLa2(t3) time, i.e. resonance fall time Tr2=t2-3；The time t of mode 76-7For the first change of current inductance La1In electric current iLa1From maximum iLa1maxResonance drops to t7Moment first change of current inductance La1In electric current iLa1(t7) time, i.e., under resonance Time T dropsr2=t6-7。
From the analysis of Figure 10 and above-mentioned change of current mode of operation, time delay Ta、Tb、TcRespectively：
To verify theoretical correctness described above, the circuit theory diagrams according to Fig. 2 are built emulation platform and tested Card, corresponding simulation result is as shown below.
In the case where the loaded self-adaptive change of current controls plan method, a kind of Resonant DC Link three-phase inverter of the present embodiment proposition Equivalent capacity CinvVoltage (DC bus-bar voltage) vCinvSimulation waveform as shown in figure 11, bus current ibusEmulation ripple Shape is as shown in figure 12, the first change of current inductance La1In electric current iLa1With the second change of current inductance La2In electric current iLa2Simulation waveform As shown in figure 13, it can be seen that above-mentioned simulation waveform is consistent with the feature work waveform shown in Fig. 8 from Figure 11, Figure 12, Figure 13, demonstrate,prove Understand the correctness of change of current mode of operation.
Under loaded self-adaptive change of current control method, a kind of Resonant DC Link three-phase inverter of the present embodiment proposition Inverter bridge the second master power switch pipe S2Voltage v when turning on and offS2With electric current iS2Simulation waveform such as Figure 14 and Figure 15 institutes Show, inverter bridge the second master power switch pipe S is can be seen that from Figure 14 I regions2Voltage vS2After resonance drops to zero, inverter bridge Second master power switch pipe S2It is just open-minded, so inverter bridge the second master power switch pipe S2It is open-minded to realize ZVS (no-voltage)；From Figure 15 II regions can be seen that inverter bridge the second master power switch pipe S2After shut-off, the voltage v at its both endsS2It is linear since 0 Rise, so inverter bridge the second master power switch pipe S2Realize ZVS (no-voltage) shut-offs.
The master power switch pipe S of inverter bridge the 3rd3With the 5th master power switch pipe S5Switch motion situation and the second main power Switch S2It is identical.The master power switch pipe S of inverter bridge the 3rd3Voltage v when turning on and offS3With electric current iS3Simulation waveform as scheme Shown in 16 and Figure 17, the master power switch pipe S of inverter bridge the 5th5Voltage v when turning on and offS5With electric current iS5Simulation waveform such as Shown in Figure 18 and Figure 19, it can be seen that the master power switch pipe S of inverter bridge the 3rd3With the 5th master power switch pipe S5It is real Show ZVS (no-voltage) to turn on and off.
Inverter bridge the first master power switch pipe S1, the 4th master power switch pipe S4With the 6th master power switch pipe S6, no matter open Logical to be also off, equal no current flows through, therefore inverter bridge the first master power switch pipe S1, the 4th master power switch pipe S4With the 6th master Power switch tube S6Soft handover is realized, its simulation waveform no longer provides herein.
Under loaded self-adaptive change of current control method, a kind of Resonant DC Link three-phase inverter of the present embodiment proposition First commutation switch pipe Sa1Voltage v when turning on and offSa1With electric current iSa1Simulation waveform as shown in Figure 20 and Figure 21, from figure 20 I regions can be seen that the first commutation switch pipe Sa1After opening, the first commutation switch pipe S is flowed througha1Electric current iSa1Since 0 It is gradually increasing, so the first commutation switch pipe Sa1It is open-minded to realize ZCS (zero current)；First is can be seen that from Figure 21 II regions Commutation switch pipe Sa1After shut-off, the first commutation switch pipe Sa1The voltage v at both endsSa1It is gradually increasing since 0, so first change of current Switching tube Sa1Realize ZVS (no-voltage) shut-offs.
In loaded self-adaptive change of current control method, the of a kind of Resonant DC Link three-phase inverter that the present embodiment proposes Two commutation switch pipe Sa2Voltage v when turning on and offSa2With electric current iSa2Simulation waveform as shown in Figure 22 and Figure 23, from Figure 22 I regions can be seen that the second commutation switch pipe Sa2After opening, the second commutation switch pipe S is flowed througha2Electric current iSa2Since 0 by Gradually rise, so the second commutation switch pipe Sa2It is open-minded to realize ZCS (zero current)；It can be seen that second changes from Figure 23 II regions Flow switching tube Sa2After shut-off, the second commutation switch pipe Sa2The voltage v at both endsSa2It is gradually increasing since 0, so second change of current is opened Close pipe Sa2Realize ZVS (no-voltage) shut-offs.
Under loaded self-adaptive change of current control method, a kind of Resonant DC Link three-phase inverter of the present embodiment proposition Bus-tie circuit breaker pipe SLVoltage v when turning on and offSLWith electric current iSLSimulation waveform as shown in figures 24 and 25, from Figure 24 I Region can be seen that bus-tie circuit breaker pipe SLThe voltage v at both endsSLAfter dropping to 0, bus-tie circuit breaker pipe SLIt is just open-minded, so bus-tie circuit breaker Pipe SLIt is open-minded to realize ZVS (no-voltage)；Bus-tie circuit breaker pipe S is can be seen that from Figure 25 II regionsLAfter shut-off, the electricity at its both ends Press vSLIt is gradually increasing since 0, and flows through bus-tie circuit breaker pipe SLElectric current iSLIt is always 0, so bus-tie circuit breaker pipe SLRealize ZVZCS (zero-voltage zero-current) shut-off.
The action waveforms explanation of above switching tube：Under loaded self-adaptive change of current control method, the one of the present embodiment proposition All switching tubes of kind Resonant DC Link three-phase inverter realize soft handover.
Under traditional carried-based PWM strategy, a kind of Resonant DC Link three-phase inverter that the present embodiment proposes exists DC bus-bar voltage v in one switch periodsCinvSimulation waveform it is as shown in figure 26；In the positive and negative alternate sawtooth carrier wave of slope Under modulation strategy, a kind of Resonant DC Link three-phase inverter that the present embodiment proposes is loaded in the direct current mother in a switch periods Line voltage vCinvSimulation waveform it is as shown in figure 27.Both contrasts can be seen that：In a switch periods, in traditional triangle Occur 6 no-voltage grooves under carrier modulation strategy on dc bus, and in the positive and negative alternate sawtooth carrier wave modulation strategy of slope Only having 1 no-voltage groove on lower dc bus, the number of no-voltage groove represents the action frequency of converter circuit, therefore tiltedly The operating frequency of converter circuit is reduced to traditional carried-based PWM strategy under the positive and negative alternate sawtooth carrier wave modulation strategy of rate 1/6.Because the appearance of no-voltage groove can cause the increase of the loss and converter circuit transmission loss of DC bus-bar voltage, therefore The positive and negative alternate sawtooth carrier wave modulation strategy of slope can greatly improve the efficiency of the utilization rate and inverter of DC bus-bar voltage.
Under traditional control method of fixing time, as load current IoDuring change, a kind of resonance that the present embodiment proposes is straight Flow the DC bus-bar voltage v of link three-phase inverterCinv, the first change of current inductance La1In electric current iLa1With the second change of current inductance La2 In electric current iLa2Simulation waveform it is as shown in figure 28；Under loaded self-adaptive change of current control method, as load current IoChange When, a kind of DC bus-bar voltage v for Resonant DC Link three-phase inverter that the present embodiment proposesCinv, the first change of current inductance La1 In electric current iLa1With the second change of current inductance La2In electric current iLa2Simulation waveform it is as shown in figure 29.As can be seen from Figure 28, Under traditional control method of fixing time, time delay need to be according to load current IoMaximum IomaxChoose.As load current Io ≠IomaxWhen, unnecessary time delay can form no-voltage groove on dc bus, cause DC bus-bar voltage utilization rate Reduce, while converter circuit is in circulation state in unnecessary time delay, this can increase the transmission loss of converter circuit, enter And reduce the efficiency of inverter.But, can be according to load electricity as a result of loaded self-adaptive change of current control method in Figure 29 Flow IoSize dynamic regulation time delay, it is precisely the change of current moment of master power switch pipe at the time of making DC bus-bar voltage be zero (i.e. the vertical edge of sawtooth carrier wave), reduces unnecessary time delay, so that the DC bus-bar voltage utilization rate and effect of inverter Rate is further lifted.Meanwhile DC bus-bar voltage v in Figure 29Cinv, the first change of current inductance La1In electric current iLa1With second change of current Inductance La2In electric current iLa2Duration with load current IoSize dynamic change, also demonstrate foregoing loaded self-adaptive The correctness of change of current control method.
Under loaded self-adaptive change of current control method, a kind of Resonant DC Link three-phase inverter of the present embodiment proposition Three-phase output current phase ia、ib、icSimulation waveform it is as shown in figure 30, as can be seen from the figure the inverter three-phase output phase Electric current ia、ib、icWaveform it is still smooth, distort very little, this shows commutation circuit topology and loaded self-adaptive proposed by the present invention Change of current control method does not influence on the normal operation of inverter.
In summary, the present invention compared with prior art, has advantages below：Avoid the zero passage of electric current in change of current inductance Reverse procedure, the magnetic hystersis loss of inductance coil and magnetically saturated problem are alleviated, extend the service life of inverter；By the change of current The operating frequency of circuit is reduced to the 1/6 of traditional carried-based PWM strategy, greatly improves the DC bus-bar voltage of inverter Utilization rate and efficiency；It can accurately realize the soft handover of master power switch pipe with the switch time of dynamic regulation commutation switch pipe, make The DC bus-bar voltage utilization rate and efficiency of inverter are further lifted.
Presently preferred embodiments of the present invention is the foregoing is only, the thought being not intended to limit the invention is all the present invention's Within spirit and principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.

Claims (9)

  1. A kind of 1. loaded self-adaptive change of current control method of Resonant DC Link three-phase inverter, it is characterised in that the resonance DC link three-phase inverter includes：Converter circuit, inverter bridge, load circuit, control circuit and dc source；
    The converter circuit includes bus-tie circuit breaker pipe, the first commutation switch pipe, the second commutation switch pipe, the first change of current inductance, the The inverse parallel two of two change of current inductance, main commutation capacitor, the first assist exchanging circuit electric capacity, the second assist exchanging circuit electric capacity, bus-tie circuit breaker pipe Pole pipe, the first booster diode, the second booster diode, the 3rd booster diode and the 4th booster diode；
    The positive pole of the colelctor electrode connection dc source of bus-tie circuit breaker pipe, the emitter stage connection inverter bridge of bus-tie circuit breaker pipe；
    The colelctor electrode of positive pole connection bus-tie circuit breaker pipe and the colelctor electrode of the first commutation switch pipe of main commutation capacitor, main commutation capacitor Negative pole connection bus-tie circuit breaker pipe emitter stage；The emitter stage of first commutation switch pipe connects one end of the first change of current inductance, the The emitter stage of the other end connection bus-tie circuit breaker pipe of one change of current inductance, the emitter stage connection dc source of the second commutation switch pipe Negative pole, the colelctor electrode of the second commutation switch pipe connect one end of the second change of current inductance, and the other end connection of the second change of current inductance is female The emitter stage of wiretap pipe；
    The negative electrode of first booster diode connects the emitter stage of the first commutation switch pipe, the anode connection of the first booster diode the The negative pole of the negative pole of one assist exchanging circuit electric capacity, the positive pole of the first assist exchanging circuit electric capacity and the second assist exchanging circuit electric capacity is all connected with bus The emitter stage of switching tube, the positive pole of the second assist exchanging circuit electric capacity connect the negative electrode of the second booster diode, the second booster diode Anode connect the second commutation switch pipe colelctor electrode；
    The colelctor electrode of the negative electrode connection bus-tie circuit breaker pipe of 3rd booster diode, the anode connection second of the 3rd booster diode are auxiliary The positive pole of commutation capacitor is helped, the anode of the 4th booster diode connects the emitter stage of the second commutation switch pipe, the 4th two poles of auxiliary The negative electrode of pipe is connected to the negative pole of the first assist exchanging circuit electric capacity；
    The emitter stage of the anode connection bus-tie circuit breaker pipe of the anti-paralleled diode of bus-tie circuit breaker pipe, the inverse parallel two of bus-tie circuit breaker pipe The colelctor electrode of the negative electrode connection bus-tie circuit breaker pipe of pole pipe；
    The inverter bridge is three phase inverter bridge, includes per phase inverter bridge the first master power switch pipe, the first master power switch pipe Inverse parallel fly-wheel diode, the parallel connection buffer electric capacity of the first master power switch pipe, the second master power switch pipe, the second main power are opened Close the inverse parallel fly-wheel diode of pipe and the parallel connection buffer electric capacity of the second master power switch pipe；Per the first main work(in phase inverter bridge The emitter stage of rate switching tube connects the colelctor electrode of the second master power switch pipe, is opened with the first master power switch pipe and the second main power The lead-out wire closed at the tie point of pipe is single-phase alternating current output end；The colelctor electrode of first master power switch pipe of each phase inverter bridge It is connected with each other, as the anode of inverter bridge, the emitter stage of the second master power switch pipe of each phase inverter bridge is connected with each other, as inverse Become the negative terminal of bridge；
    The load circuit is that three-phase hinders inductive load, and resistance one end in threephase load connects three of three phase inverter bridge respectively Single-phase alternating current output end, while the phase current of three single-phase alternating current output end outputs is believed after sensor sample as input Number difference input control circuit；
    The negative terminal of the negative pole connection inverter bridge of the dc source, the positive pole connection converter circuit median generatrix switching tube of dc source Colelctor electrode, bus-tie circuit breaker pipe emitter stage connection inverter bridge anode；
    The door of each master power switch pipe in the bus-tie circuit breaker pipe, the first commutation switch pipe, the second commutation switch pipe and inverter bridge Extremely be connected with existing control circuit, the signal control bus switching tube that is sent by control circuit, the first commutation switch pipe, Each master power switch pipe being opened and turning off in second commutation switch pipe and inverter bridge, while the output current phase of each phase is through sensing As input signal difference input control circuit after device sampling；
    Replace traditional triangular wave as the modulation strategy of carrier wave to the resonance DC using the positive and negative alternate sawtooth waveforms of slope Link three-phase inverter is modulated, and the operating frequency of converter circuit is reduced to the 1/6 of traditional carried-based PWM strategy.
  2. 2. the loaded self-adaptive change of current control method of Resonant DC Link three-phase inverter as claimed in claim 1, its feature It is, it is described to be specially as carrier wave instead of traditional triangular wave using the positive and negative alternate sawtooth waveforms of slope：
    Traditional triangular carrier is replaced with the positive and negative alternate sawtooth carrier wave of slope, the size of the slope of sawtooth carrier wave is constant, sawtooth The direction of the slope of carrier wave changes with the direction of output current phase；The direction of output current phase for just, the slope of sawtooth carrier wave Direction is just；The direction of output current phase is negative, and the direction of the slope of sawtooth carrier wave is negative.
  3. 3. the loaded self-adaptive change of current control method of Resonant DC Link three-phase inverter as claimed in claim 2, its feature It is, control method is specially：
    Opening for (1) second commutation switch pipe shifts to an earlier date T at the time of edge more vertical than sawtooth carrier wave is arrived constantlyaTime, second change of current are opened Bus-tie circuit breaker pipe shut-off while pipe is opened is closed, sawtooth carrier wave vertically turns off along the second commutation switch pipe while arriving；First Opening for commutation switch pipe postpones T at the time of edge more vertical than sawtooth carrier wave is arrived constantlybTime, bus-tie circuit breaker pipe open the moment Edge more vertical than sawtooth carrier wave postpones T at the time of arrivingcTime, the first commutation switch pipe turns off while bus-tie circuit breaker pipe is opened； Each master power switch pipe of inverter bridge is opened mode according to SPWM (sinusoidal pulse width modulation), 180 ° of phase difference complementation and worked；
    (2) according to load current IoSize dynamic regulation time delay Ta、Tb、Tc, it is proper at the time of making DC bus-bar voltage be zero It is the change of current moment of master power switch pipe well, accurately realizes the soft handover of corresponding master power switch pipe.
  4. 4. the loaded self-adaptive change of current control method of Resonant DC Link three-phase inverter as claimed in claim 3, its feature It is, the time delay Ta、Tb、TcAnd load current IoThe condition of satisfaction is：
    <mrow> <msub> <mi>T</mi> <mi>a</mi> </msub> <mo>=</mo> <mfrac> <mi>L</mi> <mi>E</mi> </mfrac> <mo>&amp;CenterDot;</mo> <msub> <mi>I</mi> <mi>o</mi> </msub> <mo>+</mo> <mfrac> <mi>&amp;pi;</mi> <mn>2</mn> </mfrac> <mo>&amp;CenterDot;</mo> <msqrt> <mrow> <mo>(</mo> <mn>2</mn> <msub> <mi>C</mi> <mi>a</mi> </msub> <mo>+</mo> <msub> <mi>C</mi> <mi>b</mi> </msub> <mo>)</mo> <mi>L</mi> </mrow> </msqrt> <mo>;</mo> </mrow>
    <mrow> <msub> <mi>T</mi> <mi>b</mi> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <msub> <mi>&amp;omega;</mi> <mn>2</mn> </msub> </mfrac> <mo>&amp;CenterDot;</mo> <mi>arcsin</mi> <mrow> <mo>(</mo> <mfrac> <mi>E</mi> <mrow> <msub> <mi>&amp;omega;</mi> <mn>2</mn> </msub> <msub> <mi>Li</mi> <mrow> <mi>L</mi> <mi>a</mi> <mn>2</mn> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> </msub> </mrow> </mfrac> <mo>)</mo> </mrow> <mo>+</mo> <mfrac> <mi>L</mi> <mi>E</mi> </mfrac> <mo>&amp;CenterDot;</mo> <msub> <mi>i</mi> <mrow> <mi>L</mi> <mi>a</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <msub> <mi>t</mi> <mn>3</mn> </msub> <mo>)</mo> </mrow> <mo>;</mo> </mrow>
    <mrow> <msub> <mi>T</mi> <mi>c</mi> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <msub> <mi>&amp;omega;</mi> <mn>2</mn> </msub> </mfrac> <mo>&amp;CenterDot;</mo> <mi>arcsin</mi> <mrow> <mo>(</mo> <mfrac> <mi>E</mi> <mrow> <msub> <mi>&amp;omega;</mi> <mn>2</mn> </msub> <msub> <mi>Li</mi> <mrow> <mi>L</mi> <mi>a</mi> <mn>2</mn> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> </msub> </mrow> </mfrac> <mo>)</mo> </mrow> <mo>+</mo> <mfrac> <mi>L</mi> <mi>E</mi> </mfrac> <mo>&amp;CenterDot;</mo> <msub> <mi>i</mi> <mrow> <mi>L</mi> <mi>a</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <msub> <mi>t</mi> <mn>3</mn> </msub> <mo>)</mo> </mrow> <mo>+</mo> <mfrac> <mi>L</mi> <mi>E</mi> </mfrac> <mo>&amp;CenterDot;</mo> <msub> <mi>I</mi> <mi>o</mi> </msub> <mo>+</mo> <mfrac> <mi>&amp;pi;</mi> <mn>2</mn> </mfrac> <mo>&amp;CenterDot;</mo> <msqrt> <mrow> <mo>(</mo> <mn>2</mn> <msub> <mi>C</mi> <mi>a</mi> </msub> <mo>+</mo> <msub> <mi>C</mi> <mi>b</mi> </msub> <mo>)</mo> <mi>L</mi> </mrow> </msqrt> <mo>;</mo> </mrow>
    <mrow> <msub> <mi>&amp;omega;</mi> <mn>2</mn> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <msqrt> <mrow> <msub> <mi>LC</mi> <mi>b</mi> </msub> </mrow> </msqrt> </mfrac> <mo>;</mo> </mrow>
    <mrow> <msub> <mi>i</mi> <mrow> <mi>L</mi> <mi>a</mi> <mn>2</mn> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> </msub> <mo>=</mo> <mi>E</mi> <mo>&amp;CenterDot;</mo> <msqrt> <mfrac> <mrow> <mn>2</mn> <msub> <mi>C</mi> <mi>a</mi> </msub> <mo>+</mo> <msub> <mi>C</mi> <mi>b</mi> </msub> </mrow> <mi>L</mi> </mfrac> </msqrt> <mo>+</mo> <msub> <mi>I</mi> <mi>o</mi> </msub> <mo>;</mo> </mrow>
    <mrow> <msub> <mi>i</mi> <mrow> <mi>L</mi> <mi>a</mi> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <msub> <mi>t</mi> <mn>3</mn> </msub> <mo>)</mo> </mrow> <mo>=</mo> <msqrt> <mrow> <msup> <mrow> <mo>(</mo> <msub> <mi>i</mi> <mrow> <mi>L</mi> <mi>a</mi> <mn>2</mn> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> </msub> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mo>-</mo> <mfrac> <mrow> <msup> <mi>E</mi> <mn>2</mn> </msup> <mo>&amp;CenterDot;</mo> <msub> <mi>C</mi> <mi>b</mi> </msub> </mrow> <mi>L</mi> </mfrac> </mrow> </msqrt> <mo>;</mo> </mrow>
    <mrow> <msub> <mi>I</mi> <mi>o</mi> </msub> <mo>=</mo> <mfrac> <mrow> <mrow> <mo>|</mo> <msub> <mi>i</mi> <mi>a</mi> </msub> <mo>|</mo> </mrow> <mo>+</mo> <mrow> <mo>|</mo> <msub> <mi>i</mi> <mi>b</mi> </msub> <mo>|</mo> </mrow> <mo>+</mo> <mrow> <mo>|</mo> <msub> <mi>i</mi> <mi>c</mi> </msub> <mo>|</mo> </mrow> </mrow> <mn>2</mn> </mfrac> <mo>;</mo> </mrow>
    Wherein, ω2For the second resonance angular frequency, iLa2maxFor the second change of current inductance La2In the maximum current that flows through, iLa2(t3) it is t3 Moment second change of current inductance La2In electric current；E is direct current power source voltage value, CaFor the capacitance of main commutation capacitor, CbFor first The capacitance of assist exchanging circuit electric capacity or the second assist exchanging circuit electric capacity, L are the inductance value of the first change of current inductance or the second change of current inductance, ia、ib、icFor the output current phase of inverter A, B, C phase.
  5. 5. the loaded self-adaptive change of current control method of the Resonant DC Link three-phase inverter as described in claim 3 or 4, it is special Sign is, time delay Ta、Tb、TcBy time delay Ta、Tb、TcCommand value generated compared with sawtooth carrier wave, by change prolong Slow time Ta、Tb、TcCommand value size i.e. adjustable time delay Ta、Tb、Tc；Time delay Ta、Tb、TcCommand value point It is not：
    Wherein, h is sawtooth carrier wave amplitude, TsFor switch periods.
  6. 6. the loaded self-adaptive change of current control method of Resonant DC Link three-phase inverter as claimed in claim 1, its feature It is, each master power switch pipe in the bus-tie circuit breaker pipe, the first commutation switch pipe, the second commutation switch pipe and inverter bridge, Using full control switching device.
  7. 7. the loaded self-adaptive change of current control method of Resonant DC Link three-phase inverter as claimed in claim 6, its feature It is, the full control switching device is power transistor, insulated gate bipolar transistor, power field effect transistor, injection increasing Strong type gated transistor, integrated Gate Commutated Thyristor or SPM.
  8. 8. the loaded self-adaptive change of current control method of Resonant DC Link three-phase inverter as claimed in claim 1, its feature It is, the anti-paralleled diode of the bus-tie circuit breaker pipe, the first booster diode, the second booster diode, the 3rd two poles of auxiliary The inverse parallel fly-wheel diode of each master power switch pipe is fast recovery diode in pipe, the 4th booster diode and inverter bridge Or high-frequency diode.
  9. 9. the loaded self-adaptive change of current control method of Resonant DC Link three-phase inverter as claimed in claim 1, its feature It is, the dc source is direct voltage source or the voltage source obtained by direct current DC-DC conversion rectifications.
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