CN102751896B - Through physical separation-type Z-source inverter with high booster multiple - Google Patents
Through physical separation-type Z-source inverter with high booster multiple Download PDFInfo
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- CN102751896B CN102751896B CN201210224628.0A CN201210224628A CN102751896B CN 102751896 B CN102751896 B CN 102751896B CN 201210224628 A CN201210224628 A CN 201210224628A CN 102751896 B CN102751896 B CN 102751896B
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Abstract
The invention relates to a through physical separation-type Z-source inverter with high booster multiple, which relates to the field of Z-source inverters, and comprises a direct current voltage source, a first blocking diode, a second blocking diode, a Z-source impedance network and a three-phase inverter bridge; and the Z-source impedance network comprises a first inductor, a second inductor, a first capacitor and a second capacitor which form an X-shaped structure. The inverter is characterized by also comprising a full-control switch device, a large capacitor and a power diode; the negative pole of the second capacitor and the collector of the full-control switch device are parallelly connected to the anode of the power diode; the emitter of the full-control switch device is connected with the negative pole of a direct current power supply; the cathode of the power diode is connected with the positive input end of the three-phase inverter bridge; the large capacitor is parallelly connected with the three-phase inverter bridge; and the positive pole and the negative pole of the capacitors are respectively connected with the positive input end and the negative input end of the three-phase inverter bridge correspondingly. According to the through physical separation-type Z-source inverter with high booster multiple, no coupling relationship exists between a booster factor and an inverter factor, the through duty ratio is independently controlled, and the booster multiple which can be realized is high.
Description
Technical field
The present invention relates to Z-source inverter, belong to Technics of Power Electronic Conversion device, say it is without coupled relation between a kind of sensitizing factor and the inversion factor in detail, the straight-through physical separation type Z-source inverter of high boosting multiple.
Background technology
Document (F. Z. Peng, Z-source inverter, IEEE Trans. Ind. Appl., 2003,39 (2): 504-510) original Z-source inverter is proposed, its structure as shown in Figure 1, by adding an X-shaped impedance network between DC power supply and inverter bridge, improve the performance of inverter, it compares traditional voltage source and current source inverter, have following good characteristic: (1) possesses the ability of boosting and step-down simultaneously, boosting is determined by sensitizing factor and the inversion factor jointly with the multiple of step-down; (2) allow to add straight-through vector in SVPWM control algolithm, eliminate dead band, improve the sine degree of output waveform.But there is lower column defects in original Z-source inverter: 1, actual insertable straight-through vector can not zero vector in more than one switch periods, causes actual attainable boosting multiple very limited.2, there is relation of interdependence between sensitizing factor and the inversion factor, both are shifting, and The Scarlet Letter changes into: can not raise simultaneously, reduce the flexibility of control strategy.
Specifically, there is following defect in original Z-source inverter: the boosting of Z-source inverter has come by adding straight-through vector, and its boosting multiple is relevant with added straight-through vector percentage, and straight-through duty ratio larger boosting multiple is larger.In order to ensure that inversion output waveform is unaffected, straight-through vector can only be inserted into the part of zero vector in SVPWM, therefore maximum straight-through duty ratio can not exceed the percentage of zero vector in a switch periods, and therefore actual attainable boosting multiple is very limited.The inversion factor is larger, and the zero vector in a switch periods is fewer, and straight-through vector can only replace with zero vector, and straight-through vector decides sensitizing factor, and therefore inversion Summing Factor sensitizing factor interdepends, in coupled relation.
Also without any document, solution is proposed to the two aspect defects that above-mentioned original Z-source inverter exists at present.Document (Chandana Jayampathi Gajanayake, Fang Lin Luo, Hoay Beng Gooi, et al. Extended-Boost Z-Source Inverters IEEE TRANSACTIONS ON POWER ELECTRONICS, 2010,25 (10): 2642-2654) original Z-source inverter is improved, propose electric capacity auxiliary boost and diode auxiliary boost type Z-source inverter, improve sensitizing factor.Document (Ding Li, Feng Gao, Poh Chiang Loh, et al. Hybrid-Source Impedance Networks:Layouts and Generalized Cascading Concepts. IEEE TRANSACTIONS ON POWER ELECTRONICS, 2011,26 (7): 2028-2040) propose the concept of Z source impedance network cascade, sensitizing factor can be improved to a great extent by the complexity increasing topological structure.But these two kinds of improvement to original Z-source inverter all need to increase power device extra in a large number, and these two kinds are improved the coupled relation all still do not removed between sensitizing factor and the inversion factor, do not have to break through the limitation leading directly to vector ratio and must be less than zero vector, actual attainable boosting multiple is still very limited.
Summary of the invention
The object of the invention is to solve above-mentioned the deficiencies in the prior art, provide without coupled relation between a kind of sensitizing factor and the inversion factor, straight-through duty ratio independently controls, the straight-through physical separation type Z-source inverter that actual attainable boosting multiple is high.
The present invention solves the technical scheme that above-mentioned the deficiencies in the prior art adopt:
A kind of straight-through physical separation type Z-source inverter of high boosting multiple, comprise direct voltage source (DC), the first blocking diode (D1) and the second blocking diode (D2), Z source impedance network and three phase inverter bridge, Z source impedance network forms X-shaped structure by the first inductance (L1), the second inductance (L2) and the first electric capacity (C1), the second electric capacity (C2), characterized by further comprising and entirely controls switching device (iST-IGBT), bulky capacitor (ultra_C) and power diode (D_S); the positive pole of DC power supply (DC) is connected with the anode of the first blocking diode (D1), the negative electrode of the first blocking diode (D1) is connected with one end of the first inductance (L1) in Z source impedance network and the positive pole of the first electric capacity (C1), the negative electrode of the second blocking diode (D2) is connected with the positive pole of the other end of the first inductance (L1) and the second electric capacity (C2), first electric capacity (C1), the negative pole of the second electric capacity (C2) is connected with the two ends of the second inductance (L2) respectively, the negative pole of the first electric capacity (C1) is also connected with the negative electrode of the second blocking diode (D2) simultaneously, the negative pole of the second electric capacity (C2) is also connected to the anode of power diode (D_S) with the collector electrode entirely controlling switching device (iST-IGBT), the emitter of full control switching device (iST-IGBT) is connected with the negative pole of DC power supply (DC), the negative electrode of power diode (D_S) is connected with the electrode input end of three phase inverter bridge, bulky capacitor (ultra_C) is in parallel with three phase inverter bridge, the positive pole of bulky capacitor (ultra_C) and negative pole are respectively with the electrode input end of three phase inverter bridge with negative input is corresponding is connected, the negative input of three phase inverter bridge is connected to the negative pole of DC power supply (DC).
Full control switching device iST-IGBT can the straight-through duty ratio (isolated Shoot-Through) in control Z source separately, so this IGBT is called iST-IGBT.The busbar voltage fluctuation that bulky capacitor ultra_C causes after being used for adding straight-through duty ratio gently, provides the ability of release instantaneous large-current simultaneously, claims this electric capacity to be bulky capacitor ultra_C.Adding of power diode is in order to avoid bulky capacitor time straight-through (ultra_C) is by entirely controlling switching device (iST-IGBT) electric discharge, this power diode mainly plays the effect that switching device (iST-IGBT) and bulky capacitor (ultra_C) are controlled in separation entirely, claims this power diode to be D_S(Diode _ Seperate).
Full control switching device (iST-IGBT) realizes the separation that Z source leads directly to vector and independently controls, and breaches straight-through duty ratio in SVPWM control algolithm and must be less than the limitation of zero vector.Operation principle and the course of work of the straight-through physical separation type Z-source inverter of the present invention's proposition are as follows: when entirely controlling switching device (iST-IGBT) conducting, DC source (DC) and Z source network are altogether, entirely controlling switching device (iST-IGBT) provides closed-loop path to two inductance of DC power supply (DC) and Z source impedance network simultaneously, DC power supply (DC) is to two induction chargings, and the inductance of store electrical energy can regard Equivalent DC source.When entirely controlling switching device (iST-IGBT) and disconnecting, DC power supply (DC) and three phase inverter bridge are altogether, DC power supply (DC) and inductance Equivalent DC source are simultaneously to three phase inverter bridge load supplying, its output voltage equals DC power supply (DC) and inductance Equivalent DC source voltage sum, output voltage higher than DC power supply (DC) voltage, thus realizes boost function.In straight-through physical separation type Z-source inverter (iST-ZSI) topological structure by the control of straight-through vector from physically separating, the straight-through duty ratio of full control switching device (iST-IGBT) can independently adjust flexibly according to actual needs between 0-50%, and the zero vector need not be confined in a switch periods, improve actual attainable boosting multiple.On the other hand, be different from original Z-source inverter, full control switching device (iST-IGBT) is not go to replace zero vector with straight-through vector, insert how many straight-through vector and do not need to have in consideration switch periods how many zero vectors, namely also sensitizing factor and the inversion factor can independent regulation separately, thus achieve the uneoupled control of sensitizing factor and the inversion factor.
Accompanying drawing explanation
Fig. 1 is original Z-source inverter topological circuit.
Fig. 2 is topological circuit of the present invention.
Fig. 3 is that the stable state inversion of the present invention when 30% straight-through duty ratio exports.
Fig. 4 is that the stable state inversion of the present invention when 40% straight-through duty ratio exports.
Embodiment
The straight-through physical separation type Z-source inverter of height boosting multiple as shown in Figure 2, comprise direct voltage source DC, the first blocking diode D1 and the second blocking diode D2, Z source impedance network and three phase inverter bridge, Z source impedance network forms X-shaped structure by the first inductance L 1, second inductance L 2 and the first electric capacity C1, the second electric capacity C2, the invention is characterized in and also comprises full control switching device iST-IGBT, bulky capacitor ultra_C and power diode D_S, the positive pole of DC power supply DC is connected with the anode of the first blocking diode D1, the negative electrode of the first blocking diode D1 is connected with one end of the first inductance L 1 in Z source impedance network and the positive pole of the first electric capacity C1, the negative electrode of the second blocking diode D2 is connected with the positive pole of the other end of the first inductance L 1 and the second electric capacity C2, first electric capacity C1, the negative pole of the second electric capacity C2 is connected with the two ends of the second inductance L 2 respectively, the negative pole of the first electric capacity C1 is also connected with the negative electrode of the second blocking diode D2 simultaneously, the negative pole of the second electric capacity (C2) is also connected to the anode of power diode (D_S) with the collector electrode entirely controlling switching device (iST-IGBT), the emitter of full control switching device (iST-IGBT) is connected with the negative pole of DC power supply (DC), the negative electrode of power diode (D_S) is connected with the electrode input end of three phase inverter bridge, bulky capacitor (ultra_C) is in parallel with three phase inverter bridge, the positive pole of bulky capacitor (ultra_C) and negative pole are respectively with the electrode input end of three phase inverter bridge with negative input is corresponding is connected, the negative terminal of three phase inverter bridge is connected to the negative pole of DC power supply (DC).
The straight-through duty ratio of full control switching device (iST-IGBT) of the present invention can independently adjust flexibly according to actual needs between 0-50%, and need not be confined to the zero vector in a switch periods, improves actual attainable boosting multiple.Full control switching device (iST-IGBT) is not go to replace zero vector with straight-through vector, insert how many straight-through vector and do not need to have in consideration switch periods how many zero vectors, namely also sensitizing factor and the inversion factor can independent regulation separately, thus achieve the uneoupled control of sensitizing factor and the inversion factor.
Below by way of a concrete emulation example, technical scheme of the present invention and implementation detail are described in further detail, its good characteristic are verified, emulation platform be Matlab Simulink.
Related symbol is described as follows:
for the voltage of input direct-current source DC.
for the voltage on bulky capacitor (ultra_C), it is also DC bus-bar voltage.
for three-phase alternating current output line voltage.
Circuit is built, the voltage of direct-current input power supplying DC according to accompanying drawing 2
for 48V, adopt the control of SVPWM algorithm realization inverter bridge six switching tubes, inversion exports and obtains 50Hz three-phase alternating current through LC filtering.The switching frequency of independent employing 10KHz and different straight-through Duty ratio controls control the turn-on and turn-off of switching device iST-IGBT entirely, thus control sensitizing factor, realize different boosting multiples.Carry out emulation experiment in the straight-through duty ratio of full control switching device iST-IGBT respectively 30% and 40%, observed object is DC bus-bar voltage
with three-phase alternating current output line voltage
.Emulation experiment is intended to verify that the present invention realizes the feasibility of sensitizing factor and inversion factor uneoupled control, breaks through the limitation that straight-through vector must be less than zero vector, and improves the positive effect of boost capability.
When accompanying drawing 3 is 30% straight-through duty ratio, the stable state of system exports, and as can be seen from Figure 3 DC input voitage 48V boosts to 120V through Z source impedance network, and last output line voltage peak value is the alternating current of 100.8V, the inversion factor
.In original Z-source inverter topological structure, if the inversion factor is 0.84, so maximum insertable straight-through duty ratio is
but, in the straight-through physical separation type Z-source inverter topological structure that the present invention proposes, but can insert the straight-through duty ratio of 30%, this achieve the uneoupled control of sensitizing factor and the inversion factor, breach the limitation that straight-through duty ratio must be less than zero vector.
Increase straight-through duty ratio in figure 4 further to 40%, the stable state of observing straight-through duty ratio system 40% time exports, can find out that DC input voitage 48V can boost to 240V through Z source impedance network busbar voltage, last output line voltage peak value is the alternating current of 201.6V, the inversion factor
.In original Z-source inverter topological structure, its maximum insertable straight-through duty ratio is
but in the Z-source inverter topological structure that the present invention proposes, but the straight-through duty ratio of 40% is inserted, this further demonstrates that Z-source inverter topological structure of the present invention has the good characteristic of sensitizing factor and inversion factor class uneoupled control, insertable straight-through duty ratio is no longer subject to the constraint of limited zero vector.
As can be seen from simulation result, low-voltage input power can boost to very high voltage and inversion exports and keeps the higher inversion factor through the present invention, and the basic thought that its straight-through vector physical separation controls is feasible.Compared with original Z-source inverter, the present invention can realize the uneoupled control between sensitizing factor and the inversion factor, remove relation of interdependence between the two, actual insertable straight-through duty ratio can change according to specific needs arbitrarily, and insertable straight-through duty ratio need not be limited because zero vector is limited, therefore topological structure boost capability of the present invention is stronger, controls more flexible.
Claims (1)
1. the straight-through physical separation type Z source inventer of one kind high boosting multiple, comprise direct voltage source (DC), the first blocking diode (D1) and the second blocking diode (D2), Z source impedance network and three phase inverter bridge, Z source impedance network forms X shape structure by the first inductance (L1), the second inductance (L2) and the first electric capacity (C1), the second electric capacity (C2), characterized by further comprising and entirely controls switching device, bulky capacitor (ultra_C) and power diode (D_S), the positive pole of DC power supply (DC) is connected with the anode of the first blocking diode (D1), the negative electrode of the first blocking diode (D1) is connected with one end of the first inductance (L1) in Z source impedance network and the positive pole of the first electric capacity (C1), the anode of the second blocking diode (D2) is connected with the positive pole of the other end of the first inductance (L1) and the second electric capacity (C2), first electric capacity (C1), the negative pole of the second electric capacity (C2) is connected with the two ends of the second inductance (L2) respectively, the negative pole of the first electric capacity (C1) is also connected with the negative electrode of the second blocking diode (D2) simultaneously, the negative pole of the second electric capacity (C2) is also connected to the anode of power diode (D_S) jointly with the collector electrode entirely controlling switching device, the emitter of full control switching device is connected with the negative pole of DC power supply (DC), the negative electrode of power diode (D_S) is connected with the electrode input end of three phase inverter bridge, bulky capacitor (ultra_C) is in parallel with three phase inverter bridge, the positive pole of bulky capacitor (ultra_C) and negative pole are respectively with the electrode input end of three phase inverter bridge with negative input is corresponding is connected, the negative input of three phase inverter bridge is connected to the negative pole of DC power supply (DC), when full control switch device conductive, DC source (DC) and Z source network are altogether, full control switching device provides closed-loop path to two inductance of DC power supply (DC) and Z source impedance network simultaneously, and DC power supply (DC) is to two induction chargings, and the inductance of store electrical energy is as Equivalent DC source, when full control switching device disconnects, DC power supply (DC) and three phase inverter bridge are altogether, DC power supply (DC) and inductance Equivalent DC source are simultaneously to three phase inverter bridge load supplying, its output voltage equals DC power supply (DC) and inductance Equivalent DC source voltage sum, and output voltage is higher than DC power supply (DC) voltage.
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| CN103973180B (en) * | 2014-04-25 | 2016-08-24 | 天津大学 | A kind of back-emf zero-crossing examination method for brshless DC motor |
| CN104158224A (en) * | 2014-09-02 | 2014-11-19 | 哈尔滨工业大学（威海） | Control algorithm for grid-connected/off-grid switch of Z source inverter |
| CN104734547B (en) * | 2015-03-19 | 2017-08-04 | 南京航空航天大学 | A kind of boosting unit Z-source inverter |
| CN109256811A (en) * | 2018-11-16 | 2019-01-22 | 上海海事大学 | A kind of shaft generator system peculiar to vessel and its control method |
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| CN1502918A (en) * | 2002-11-26 | 2004-06-09 | 乐金电子(天津)电器有限公司 | Control circuit and method for current inversion motor of current inversion air conditioner |
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| JP2011147233A (en) * | 2010-01-13 | 2011-07-28 | Toyota Industries Corp | Z source boost circuit |
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| CN1502918A (en) * | 2002-11-26 | 2004-06-09 | 乐金电子(天津)电器有限公司 | Control circuit and method for current inversion motor of current inversion air conditioner |
Non-Patent Citations (2)
| Title |
|---|
| Z源变换器;彭方正等;《电工技术学报》;20040228;第19卷(第2期);第48页第3节，图2、4 * |
| 串联型Z源滞环控制策略研究;施胜丹等;《电源技术》;20120630;第36卷(第6期);第3页第1.3.2节，第4页第1.3.3节，图1 * |
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