CN105450076A - Z-source three-level inverter and air conditioning system - Google Patents
Z-source three-level inverter and air conditioning system Download PDFInfo
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- CN105450076A CN105450076A CN201510585482.6A CN201510585482A CN105450076A CN 105450076 A CN105450076 A CN 105450076A CN 201510585482 A CN201510585482 A CN 201510585482A CN 105450076 A CN105450076 A CN 105450076A
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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
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
Abstract
Disclosed in the invention is a Z-source three-level inverter connected with an intelligent power module. The intelligent power module is connected with a permanent magnet synchronous motor. The Z-source three-level inverter consists of a voltage dividing capacitor, a first diode D1, a second diode D2, an X-shaped impedance network and a bidirectional converter. The bidirectional converter employs a half-bridge two-bridge-arm diode clamp three-level topological structure. Therefore, the low current and high network-entering current quality are realized; the voltage-withstanding level can be improved based on rectification; the alternating-current harmonic voltage and current are reduced; and the power factor is improved. Besides, the structures of the inverter and the system are simple and the efficiencies are high; the good disturbance suppression capability is good; and the steady-state error in the output current can be eliminated.
Description
Technical field
The present invention relates to inverter field, particularly Z source three-level inverter and the air-conditioning system containing this Z source three-level inverter.
Background technology
Energy supply pressure that is nervous and environmental protection makes clean reproducible energy generation technology worldwide be paid much attention to.Wherein, photovoltaic generation having without region restriction, without features such as fuel consumption, contamination-free and noise emissions, having obvious advantage providing clean, reliable concerned power.Current photovoltaic industry is by " supplementing the energy " trend " alternative energy source ".Grid-connection converter is the core apparatus of grid-connected photovoltaic system, and its topological structure plays vital effect to conversion efficiency and cost control.Converter short circuit being caused when conventional transducers upper and lower bridge arm leads directly to, usually needing for avoiding this situation to introduce dead band in convertor controls signal, and then cause converter fail safe decline output harmonic wave content to increase; For improving conversion efficiency, if adopted without isolating transformer structure, but will certainly cause that voltage transformation rate is high, output common mode voltage is high and the defect such as harmonic content is high.If the grid-connected link of current PV air-conditioner adopts isolating transformer to realize the electrical energy transfer of photovoltaic cell to electrical network, system is existed, and cost is high, Heavy Weight, volume large, the shortcomings such as conversion efficiency is low.When three-phase PV air-conditioner and system topology as shown in Figure 1.Electrical network input is 380V three-phase alternating-current supply, adopt the uncontrollable rectification of three-phase+PFC topology or the conversion of two-way full bridge PWM, for three-phase alternating current load (compressor) power supply, wherein not rectifiable+PFC converts, a large amount of reactive powers and harmonic pollution is brought to electrical network, and the conversion of two-way full bridge PWM, have employed isolating transformer carries out electrical network and photovoltaic inversion link is isolated, thus increase system bulk, weight and cost, reduce conversion efficiency simultaneously.
Summary of the invention
For solve the employing that exists in above-mentioned prior art without the isolating transformer structure defects such as then voltage transformation rate is high, output common mode voltage is high and harmonic content is high or adopt isolating transformer then to make system exist cost is high, Heavy Weight, volume are large, the technical problems such as conversion efficiency is low, the invention provides a kind of Z source three-level inverter.
The invention provides a kind of Z source three-level inverter, it is connected with Intelligent Power Module, Intelligent Power Module is connected with permagnetic synchronous motor, Z source three-level inverter comprises voltage-dividing capacitor, the first diode D1, the second diode D2, X-shaped impedance network and two way convertor, wherein, two way convertor adopts half-bridge two brachium pontis diode clamping tri-level topological structure.
As preferably, voltage-dividing capacitor comprises the C be connected in series
dc1and C
dc2, the direct voltage Upv that solar panel exports is through voltage-dividing capacitor C
dc1and C
dc2after dividing potential drop, input to X-shaped impedance network by the first diode D1 and the second diode D2.
As preferably, X-shaped impedance network comprises the first inductor L1, the second inductor L2 and the first capacitor C1, the second capacitor C2.
As preferably, two way convertor comprises first to the 8th power switch transistor Sa1, Sa2, Sa3, Sa4, Sb1, Sb2, Sb3, Sb4 and the 3rd to the 6th diode Da5, Da6, Db5, Db6,
As preferably, wherein, the anode of the first diode D1 and voltage-dividing capacitor C
dc1positive pole connect, and the negative electrode of the first diode D1 is connected with the one end of the first inductor L1 in X-shaped impedance network and one end of the first capacitor C1; The negative electrode of the second diode D2 and the second voltage-dividing capacitor C
dc2negative pole be connected with earthed voltage, and the anode of the second diode D2 is connected with the one end of the second inductor L2 in X-shaped impedance network and one end of the second capacitor C2; The other end of the first inductor L1 is connected with the drain electrode of the first power switch transistor Sa1 in the other end of the second capacitor C2 and two way convertor and the drain electrode of the 5th power switch transistor Sb1, and is connected with the input of Intelligent Power Module; The other end of the second inductor L2 is connected with the source electrode of the 4th power switch transistor Sa4 in the other end of the second capacitor C1 and two way convertor and the source electrode of the 8th power switch transistor Sb4.
As preferably, the source electrode of the first power switch transistor Sa1 connects the drain electrode of the second power switch transistor Sa2 and the negative electrode of the 3rd diode Da5, the source electrode of the second power switch transistor Sa2 is connected with the drain electrode of the 3rd power switch transistor Sa3 and becomes the B phase voltage Ub of three phase network via inductor Lb, the source electrode of the 3rd power switch transistor Sa3 connects the drain electrode of the 4th power switch transistor Sa4 and the anode of the 4th diode Da6, wherein, the negative electrode of the 4th diode Da6 is connected with reference voltage 0 with the anode of the 3rd diode Da5, the source electrode of the 5th power switch transistor Sb1 connects the drain electrode of the 6th power switch transistor Sb2 and the negative electrode of the 5th diode Db5, the source electrode of the 6th power switch transistor Sb2 is connected with the drain electrode of the 7th power switch transistor Sb3 and becomes the A phase voltage Ua of three phase network via inductor La, the source electrode of the 7th power switch transistor Sb3 connects the drain electrode of the 8th power switch transistor Sb4 and the anode of the 6th diode Db6, the source electrode of the 8th power switch transistor Sb4 is connected with the other end of the inductor L2 in X-shaped impedance network and the source electrode of the 4th power switch transistor Sa4, the negative electrode of the 6th diode Db6 is connected with reference voltage 0 with the anode of the 5th diode Db5, and the C phase voltage Uc of three phase network is become via inductor Lc.
The present invention also provides a kind of air-conditioning system, and it comprises according to the Z source three-level inverter in above-mentioned arbitrary technical scheme.
As preferably, air-conditioning system also comprises phase-locked loop, the space vector pulse width modulation module be connected with Z source three-level inverter and maximal power tracing module, and space vector pulse width modulation module is connected with ratio resonance modules with proportional integral module.
As preferably, Z source three-level inverter is connected with the second coordinate converter by phase-locked loop, and Z source three-level inverter is connected with ratio resonance modules by the first coordinate converter, comparator.
As preferably, ratio resonance modules comprises proportional controller and resonant regulator, and its transfer function is:
A kind of three-phase non-isolated combining inverter that the present invention proposes changes the full-bridge IPM that in the past adopted to realize two-way AC/DC, the two-way AC/DC topological structure of half-bridge diode clamping tri-level is proposed, replace original BOOST type DC/DC and rise circuit, adopt novel Z source single-stage invert topological structure, for better realizing sinusoidal reference current tracing control, in native system, adoption rate resonance controls.The invention has the advantages that: adopt novel two-way AC/DC converter, inversion can realize low-leakage current, high grid current quality, rectification can realize improving voltage withstand class, reduces AC harmonic voltages, electric current, improves power factor; Z-source inverter is single level system, and have the simple feature of single-stage inverter structure, efficiency is than the height of two-stage, and overcome conventional multi-electrical level inverter can only the deficiency that can not boost of step-down, meanwhile, control signal, without the need to arranging dead band, avoids the wave distortion that dead time effect causes then; Ratio resonance controls can effectively follow the tracks of sinusoidal reference value, and has good Disturbance Rejection ability, can eliminate the steady-state error in output current.
More outstanding is, non-isolated is realized by simplifying isolating transformer, this non-isolation type combining inverter structure is not containing transformer, there is efficiency high, volume is little, the advantages such as lightweight and cost is low, simultaneously, non-isolation type inverter structure causes there is electrical connection between cell panel and electrical network, due to the existence of cell panel parasitic capacitance over the ground, when the switch motion of combining inverter power device may produce high frequency, time variant voltage acts on parasitic capacitance, and by cell panel parasitic capacitance, in the resonant tank of directly/composition such as alternating current filter and electric network impedance, its impedance of consideration optimized for transducer effciency is very low, thus the common mode current produced in this loop, i.e. leakage current.There is the structural advantage made up by the leakage current brought without isolating transformer and network access DC component problem, the advantage such as simultaneously can realize differential output voltage as Unipolar SPWM full-bridge inverter and switching device voltage stress is low based on diode clamping tri-level converter topology structure.
Accompanying drawing explanation
Fig. 1 is traditional three-phase PV air-conditioner system schematic;
Fig. 2 is the circuit diagram of the Z source three-level inverter that the present invention relates to;
Fig. 3 is the control circuit figure of the Z source three-level inverter based on PR control that the present invention relates to;
Fig. 4 is the schematic diagram of the non-straight-through mode of operation of the Z source three-level inverter that the present invention relates to;
Fig. 5 is each state equivalent circuit diagram of the Z source three-level inverter that the present invention relates to.
Embodiment
In order to better the intent of the present invention is described, below in conjunction with accompanying drawing, content of the present invention is described further.
With reference to Fig. 2, Fig. 2 shows the circuit structure diagram of the Z source three-level inverter in an embodiment, this Z source three-level inverter is mainly used in air-conditioning system, Upv in figure represents the direct voltage that solar panel exports, this Z source three-level inverter is connected with Intelligent Power Module (IPM), this Intelligent Power Module (IPM) is connected with permagnetic synchronous motor (PMSM), can control permagnetic synchronous motor (PMSM) like this run by Z source three-level inverter.Particularly, this Z source three-level inverter comprises voltage-dividing capacitor, the first diode D1, the second diode D2, X-shaped impedance network and two way convertor, and wherein, this two way convertor adopts half-bridge two brachium pontis diode clamping tri-level topological structure.
Wherein, voltage-dividing capacitor comprises the C be connected in series
dc1and C
dc2, the first voltage-dividing capacitor C
dc1negative pole and the second voltage-dividing capacitor C
dc2positive pole connect, solar panel export direct voltage Upv through voltage-dividing capacitor C
dc1and C
dc2after dividing potential drop, input to X-shaped impedance network by the first diode D1 and the second diode D2.
X-shaped impedance network comprises the first inductor L1, the second inductor L2 and the first capacitor C1, the second capacitor C2, two way convertor comprises first to the 8th power switch transistor Sa1, Sa2, Sa3, Sa4, Sb1, Sb2, Sb3, Sb4 and the 3rd to the 6th diode Da5, Da6, Db5, Db6, wherein, the anode of the first diode D1 and voltage-dividing capacitor C
dc1positive pole connect, and the negative electrode of the first diode D1 is connected with the one end of the first inductor L1 in X-shaped impedance network and one end of the first capacitor C1; The negative electrode of the second diode D2 and the second voltage-dividing capacitor C
dc2negative pole be connected with earthed voltage, and the anode of the second diode D2 is connected with the one end of the second inductor L2 in X-shaped impedance network and one end of the second capacitor C2; The other end of the first inductor L1 is connected with the drain electrode of the first power switch transistor Sa1 in the other end of the second capacitor C2 and two way convertor and the drain electrode of the 5th power switch transistor Sb1, and is connected with the input of Intelligent Power Module (IPM); The other end of the second inductor L2 is connected with the source electrode of the 4th power switch transistor Sa4 in the other end of the second capacitor C1 and two way convertor and the source electrode of the 8th power switch transistor Sb4.Each power switch transistor is connected with a diodes in parallel respectively.
The source electrode of the first power switch transistor Sa1 connects the drain electrode of the second power switch transistor Sa2 and the negative electrode of the 3rd diode Da5, the source electrode of the second power switch transistor Sa2 is connected with the drain electrode of the 3rd power switch transistor Sa3 and becomes the B phase voltage Ub of three phase network via inductor Lb, the source electrode of the 3rd power switch transistor Sa3 connects the drain electrode of the 4th power switch transistor Sa4 and the anode of the 4th diode Da6, wherein, the negative electrode of the 4th diode Da6 is connected with reference voltage 0 with the anode of the 3rd diode Da5, the source electrode of the 5th power switch transistor Sb1 connects the drain electrode of the 6th power switch transistor Sb2 and the negative electrode of the 5th diode Db5, the source electrode of the 6th power switch transistor Sb2 is connected with the drain electrode of the 7th power switch transistor Sb3 and becomes the A phase voltage Ua of three phase network via inductor La, the source electrode of the 7th power switch transistor Sb3 connects the drain electrode of the 8th power switch transistor Sb4 and the anode of the 6th diode Db6, the source electrode of the 8th power switch transistor Sb4 is connected with the other end of the inductor L2 in X-shaped impedance network and the source electrode of the 4th power switch transistor Sa4, the negative electrode of the 6th diode Db6 is connected with reference voltage 0 with the anode of the 5th diode Db5, and the C phase voltage Uc of three phase network is become via inductor Lc.The Z source three-level inverter adopted in the present invention can overcome following deficiency: (1) conventional voltage source converter and current-source convertor can only boost or step-down, cause output voltage range limited; (2) short circuit of upper and lower bridge arm or open circuit, thus make brachium pontis switching tube by overcurrent or over-voltage breakdown.Z source three-level inverter and topological structure thereof make bridge arm direct pass become a kind of normal operating conditions, by controlling straight-through duty ratio, Z source three-level inverter not only can realize boosting and export, and due to the straight-through damage that can not cause power device, greatly can improve the reliability of system, in addition, control signal avoids dead time effect then without the need to arranging dead band.This topological structure is compared traditional structure and is had that grid-connected current quality is high, system effectiveness is high and the advantage such as cost is low.
Fig. 3 shows and adopts Z source three-level inverter to carry out the concrete mode controlled, wherein u in Fig. 3
srefer to when maximal power tracing module (MPPT) monitors ceiling voltage and current value, Maximum Power Output point voltage u*
pv, then to by this maximum power point voltage u*
pvbe input to proportional integral (PI) module carry out proportional plus integral control with monitored voltage U pv obtained result of making comparisons, the result controlling to obtain is u
s.U in Fig. 3
αand u
βcalculation procedure as follows:
(1) inverter output three-phase current ia, ib, ic are converted, to obtain biphase current i α, i β by the mode of abc coordinate to α/β coordinate transform by the first coordinate converter.
(2) phase-locked loop pll is by monitoring line voltage and detecting, and obtains phase angle θ.(3) by the voltage u across the first capacitor C1
dcwith input voltage u*
dcmake comparisons, compare the result obtained and be input to proportional integral module (PI) by this and carry out proportional plus integral control and obtain current i *
dbe combined with phase angle θ with input current i*q, undertaken from abc coordinate to α/β transformation of coordinates by the second coordinate converter, and obtain current i *
αand i*
β.
(4) to by current i *
αand i*
βrespectively with i
αand i
βthe result that obtains of making comparisons is input to ratio resonance modules (PR) and carries out the control of ratio resonance, to obtain result u
αand u
β.Here it should be noted that, the direct voltage outer shroud that the vector control system of conventional transducers grid voltage orientation generally adopts PI controller to control, the double circle structure of current inner loop.It needs through repeatedly coordinate transform, and needs feed forward decoupling control, and thus system configuration is complicated, realizes difficulty.In static coordinate, the command signal of current inner loop is with fundamental frequency ω to cause the main cause of control structure complexity to be
ochange sine wave signal, and cannot realize according to pi regulator in static coordinate right
with
dAZ gene control.Here adopt PR ratio resonance modules, it without the ac-dc conversion of complexity, but directly can control of ac, reaches the object eliminating steady-state error.Ratio resonance modules comprises proportional controller and resonant regulator, and its transfer function is:
it is at fundamental frequency ω=ω
oplace's gain is infinitely great, and very little in non-fundamental frequency place gain, and therefore, PR resonant controller can to frequencies omega=ω
osinusoidal signal realize DAZ gene control.
When carrying out voltage control, us, u α and u β being input to space vector pulse width modulation (SVPWM) module, carrying out space vector pulse width modulation, export SVPWM pulse.Obtained SVPWM pulse is input to respectively each power switch transistor of Z source three-level inverter, thus makes Z source three-level inverter export suitable three-phase voltage.
Tradition three-level converter, no matter work in rectification or inverter mode, each brachium pontis all has three effective on off states (1,0,-1), and Z source three level two way convertor needs to introduce pass-through state, therefore converter need be discussed in two kinds of situation: straight-through and non-straight-through, its operating state is as shown in table 1 below.
Table 1 single-phase bridge arm switch state and output end voltage
(1) when working in non-pass-through state, as shown in Figure 5 a, now diode D1, D2 conducting, inverter bridge and load can be equivalent to two current sources to its equivalent electric circuit.Wherein K1={1, if Sb1=Sb2=1; 0, if Sb2=Sb3=1;-1, if Sb3=Sb4=1}, K2={1, if Sa1=Sa2=1; 0, if Sa2=Sa3=1;-1, if Sa3=Sa4=1}, wherein switch S ai and Sbi (i=1,2,3,4), is 1 during Sai and Sbi conducting, otherwise is 0.Neutral point n keeps dynamic electric voltage balance, Vcd1=Vcd2=Udc/2, Van, Vbn have respectively 3 kinds of level Udc/2,0 ,-Udc/2, and Vab have 5 kinds of level-Udc/2 ,-Udc, 0, Udc, Udc/2, as shown in table 2, the withstand voltage can finding out each switching tube is Udc/2, thus effectively reduces the voltage stress of each switching tube.Now 9 kinds of mode of operations of the two-way AC/DC converter of three level as shown in Figure 4;
Table 2Z source three-level inverter non-straight is connected with effect on off state
(2) upper pass-through state.When converter certain phase brachium pontis above the simultaneously conducting of threephase switch pipe time, converter enters pass-through state, now diode D1 conducting because bearing forward voltage, and the energy trasfer in electric capacity Cdc1 is in inductance L 1; Diode D2 bears reverse voltage and ends, and equivalent electric circuit as shown in Figure 5 b;
(3) pass-through state under.When converter certain phase brachium pontis below the simultaneously conducting of threephase switch pipe time, converter enters lower pass-through state, now diode D2 conducting because bearing forward voltage, and the energy trasfer in electric capacity Cdc2 is in inductance L 2; Diode D1 bears reverse voltage and ends, and equivalent electric circuit as shown in Figure 5 c;
(4) full pass-through state.When 4 switching tubes conducting simultaneously of converter phase brachium pontis, converter enters full pass-through state, and now diode D1, D2 bears reverse voltage and end, and equivalent electric circuit as fig 5d.
For making Z source converter output voltage Uo keep balance under two kinds of pass-through states, the upper and lower straight-through time should be consistent.
Embodiments of the invention are only the descriptions carried out the preferred embodiment of the present invention; not design of the present invention and scope are limited; under the prerequisite not departing from design philosophy of the present invention; the various modification that in this area, engineers and technicians make technical scheme of the present invention and improvement; protection scope of the present invention all should be fallen into; the technology contents of request protection of the present invention, all records in detail in the claims.
Claims (10)
1. a Z source three-level inverter, it is connected with Intelligent Power Module, described Intelligent Power Module is connected with permagnetic synchronous motor, described Z source three-level inverter comprises voltage-dividing capacitor, the first diode (D1), the second diode (D2), X-shaped impedance network and two way convertor, wherein, described two way convertor adopts half-bridge two brachium pontis diode clamping tri-level topological structure.
2. Z source according to claim 1 three-level inverter, is characterized in that: described voltage-dividing capacitor comprises the first voltage-dividing capacitor (C be connected in series
dc1) and the second voltage-dividing capacitor (C
dc2), the direct voltage that solar panel exports is through described voltage-dividing capacitor (C
dc1and C
dc2) after dividing potential drop, input to described X-shaped impedance network by described first diode (D1) and described second diode (D2).
3. Z source according to claim 2 three-level inverter, is characterized in that: described X-shaped impedance network comprises the first inductor (L1), the second inductor (L2) and the first capacitor (C1), the second capacitor (C2).
4. Z source according to claim 3 three-level inverter, is characterized in that: described two way convertor comprises the first to the 8th power switch transistor (Sa1, Sa2, Sa3, Sa4, Sb1, Sb2, Sb3, Sb4) and the 3rd to the 6th diode (Da5, Da6, Db5, Db6).
5. Z source according to claim 4 three-level inverter, is characterized in that: wherein, the anode of described first diode (D1) and described voltage-dividing capacitor (C
dc1) positive pole connect, and the negative electrode of described first diode (D1) is connected with the one end of described first inductor (L1) in described X-shaped impedance network and one end of described first capacitor (C1); The negative electrode of described second diode (D2) and described second voltage-dividing capacitor (C
dc2) negative pole be connected with earthed voltage, and the anode of described second diode (D2) is connected with the one end of described second inductor (L2) in described X-shaped impedance network and one end of described second capacitor (C2); The other end of described first inductor (L1) is connected with the drain electrode of described first power switch transistor (Sa1) in the other end of described second capacitor (C2) and described two way convertor and the drain electrode of described 5th power switch transistor (Sb1), and is connected with the input of described Intelligent Power Module; The other end of described second inductor (L2) is connected with the source electrode of described 4th power switch transistor (Sa4) in the other end of described second capacitor (C1) and described two way convertor and the source electrode of described 8th power switch transistor (Sb4).
6. Z source according to claim 5 three-level inverter, it is characterized in that: the source electrode of described first power switch transistor (Sa1) connects the drain electrode of described second power switch transistor (Sa2) and the negative electrode of described 3rd diode (Da5), the source electrode of described second power switch transistor (Sa2) is connected with the drain electrode of described 3rd power switch transistor (Sa3) and becomes the B phase voltage of three phase network via inductor (Lb), the source electrode of described 3rd power switch transistor (Sa3) connects the drain electrode of described 4th power switch transistor (Sa4) and the anode of described 4th diode (Da6), wherein, the negative electrode of described 4th diode (Da6) is connected with reference voltage with the anode of described 3rd diode (Da5), the source electrode of described 5th power switch transistor (Sb1) connects the drain electrode of described 6th power switch transistor (Sb2) and the negative electrode of described 5th diode (Db5), the source electrode of described 6th power switch transistor (Sb2) is connected with the drain electrode of described 7th power switch transistor (Sb3) and becomes the A phase voltage of three phase network via inductor (La), the source electrode of described 7th power switch transistor (Sb3) connects the drain electrode of described 8th power switch transistor (Sb4) and the anode of described 6th diode (Db6), the described source electrode of the 8th power switch transistor (Sb4) is connected with the other end of the described inductor (L2) in described X-shaped impedance network and the source electrode of described 4th power switch transistor (Sa4), the negative electrode of described 6th diode (Db6) is connected with reference voltage with the anode of described 5th diode (Db5), and the C phase voltage of three phase network is become via inductor (Lc).
7. an air-conditioning system, it comprises the Z source three-level inverter according to any one of claim 1-6.
8. air-conditioning system according to claim 7, it is characterized in that: described air-conditioning system also comprises phase-locked loop, the space vector pulse width modulation module be connected with Z source three-level inverter and maximal power tracing module, and described space vector pulse width modulation module is connected with ratio resonance modules with proportional integral module.
9. air-conditioning system according to claim 8, it is characterized in that: described Z source three-level inverter is connected with the second coordinate converter by described phase-locked loop, and described Z source three-level inverter is connected with described ratio resonance modules by the first coordinate converter, comparator.
10. air-conditioning system according to claim 8 or claim 9, is characterized in that: described ratio resonance modules comprises proportional controller and resonant regulator, and its transfer function is:
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| CN107046378A (en) * | 2017-04-06 | 2017-08-15 | 哈尔滨理工大学 | A kind of two-way Z sources three-level inverter |
| CN109921663A (en) * | 2019-04-01 | 2019-06-21 | 三峡大学 | A kind of two bridge arm tri-level rectifier of three-phase based on soft switch technique |
| CN110289782A (en) * | 2019-07-05 | 2019-09-27 | 烟台大学 | Two bridge arm tri-level inverter of impedance network active-clamp three-phase and control strategy |
| CN112737317A (en) * | 2020-12-28 | 2021-04-30 | 河北建投新能源有限公司 | Z source inverter and power supply system |
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| CN112737317A (en) * | 2020-12-28 | 2021-04-30 | 河北建投新能源有限公司 | Z source inverter and power supply system |
| CN112737317B (en) * | 2020-12-28 | 2022-04-12 | 河北建投新能源有限公司 | Z source inverter and power supply system |
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