CN100499343C - AC-AC three level AC-AC converter based on positive converter - Google Patents

AC-AC three level AC-AC converter based on positive converter Download PDF

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CN100499343C
CN100499343C CNB2007100209464A CN200710020946A CN100499343C CN 100499343 C CN100499343 C CN 100499343C CN B2007100209464 A CNB2007100209464 A CN B2007100209464A CN 200710020946 A CN200710020946 A CN 200710020946A CN 100499343 C CN100499343 C CN 100499343C
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power switch
quadrant
converter
input filter
clamp
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CN101150286A (en
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李磊
韦徵
杨君东
仲庆龙
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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Abstract

本发明公开了一种基于正激变换器的交-交型三电平交-交变换器。该变换器的电路结构由依次连接的输入高压交流电源、输入滤波器、多电平变换器、高频变压器、周波变换器、输出滤波器以及输出交流负载构成，其中多电平变换器由一个或多个基本构成单元构成将输入电压转化为多种输出电平；该基本构成单元由两个四象限功率开关和一个四象限箝位功率开关组成。基于正激变换器的交-交型三电平交-交变换器的电路拓扑族，包括正激式、推挽式、半桥式和全桥式拓扑。本发明降低功率开关的电压应力，减少功率变换级数，提高输入侧功率因数、变换效率和功率密度；能够适用于高频电气隔离的高压交-交电能变换场合，大大拓宽了三电平交-交变换器的应用领域。

Figure 200710020946

The invention discloses an AC-AC three-level AC-AC converter based on a forward converter. The circuit structure of the converter consists of sequentially connected input high-voltage AC power supply, input filter, multi-level converter, high-frequency transformer, cycloconverter, output filter and output AC load, wherein the multi-level converter consists of a Or a plurality of basic constituent units are formed to convert the input voltage into various output levels; the basic constituent unit is composed of two four-quadrant power switches and one four-quadrant clamp power switch. The circuit topology family of AC-AC three-level AC-AC converter based on forward converter, including forward, push-pull, half-bridge and full-bridge topologies. The invention reduces the voltage stress of the power switch, reduces the number of power conversion stages, and improves the input side power factor, conversion efficiency and power density; it can be applied to high-voltage AC-AC power conversion occasions with high-frequency electrical isolation, and greatly expands the range of three-level AC power conversion. -Application fields of alternating converters.

Figure 200710020946

Description

Friendship-friendship type three-level AC-AC-AC converter based on forward converter
Technical field
The invention belongs to the Technics of Power Electronic Conversion technology, particularly-kind of friendship-friendship type three-level AC-AC-AC converter based on forward converter.
Background technology
Friendship-friendship (AC-AC) converter technique is the applied power semiconductor device, convert the AC energy of a certain frequency and amplitude a kind of Semiconductor Converting Technology of the AC energy of same or another frequency and amplitude to, be widely used in national defence, industrial and mining enterprises, scientific research institutions, laboratory in colleges and universities and the daily life.
Up to now, the power electronics researcher mainly concentrates on two level friendship-AC-AC converters such as non-electrical isolation formula, low frequency and high frequency electrical isolation formula for the research of friendship-AC-AC converter both at home and abroad; Research for multi-level converter, mainly concentrate on many level DC-DCs, DC-AC and AC-DC converter, research for many level friendship-AC-AC converters is then considerably less, and only is confined to non-isolated, low frequency or the isolated friendship of the intermediate frequency-straight-many level friendship-AC-AC converters of friendship type and the non-isolated friendship of Buck type-friendship type three-level AC-AC-AC converter.Though hand over-straight-many level friendship-AC-AC converters of friendship type and the non-isolated friendship of Buck type-each tool advantage of friendship type three-level AC-AC-AC converter, there are defectives such as circuit topology complexity, Power Conversion progression is many, the input side power factor is low, conversion efficiency is on the low side, power density is low in the former; And the latter exist topological form single, can only realize defectives such as decompression transformation, no electrical isolation.
People such as M.Glinka have proposed the isolated friendship of a kind of intermediate frequency-straight-many level friendship-AC-AC converters of friendship type (" A newAC/AC multilevel converter family ", IEEE Transactions on Industrial Electronics, 2005, Vol.52, No.3, pp.662～669.), its circuit structure is by modular multilevel friendship-AC-AC converter (M 2LC), formations such as intermediate frequency transformer, rectifier, inverter and filter, have that electrical isolation, output voltage are controlled, modularization, be applied to advantages such as high pressure friendship-alternation changes, but have that topology complexity, Power Conversion progression many (low-frequency ac LFAC-direct current DC-midfrequent AC MFAC-direct current DC-low-frequency ac LFAC), input side power factor are low, conversion efficiency and power density is low, volume weight greatly, control defectives such as complexity.
Summary of the invention
Goal of the invention of the present invention is to provide a kind of and has that topology is succinct, good, conversion efficiency and power density height of terminal voltage spectral characteristic before the high frequency electrical isolation, two stage power conversion (low-frequency ac LFAC-high-frequency ac HFAC-low-frequency ac LFAC), bidirectional power flow, input side power factor height, output filter, be applied to the friendship based on the forward converter-friendship type three-level AC-AC-AC converter of high pressure friendships-alternating current energy conversion occasion.
The technical solution that realizes the object of the invention is: a kind of friendship based on forward converter-friendship type three-level AC-AC-AC converter, constitute by the input filter, multi-level converter, high frequency transformer, frequency converter, output filter and the output AC load that connect successively, this converter is transformed into sinusoidal ac with alternating current, and reduce Power Conversion progression, realize high frequency electrical isolation, be applied to the circuit structure that high pressure friendship-alternation carry over closes, promptly import filter inductance L iWith input filter capacitor C iConstitute input filter, this input filter is to input high-voltage ac power u iCarry out filtering, will be converted into many level of bipolarity output voltage u through the filtered input voltage of input filter N1Multi-level converter and the elementary winding N of high frequency transformer T 1Connect the secondary winding N of this high frequency transformer 2Be connected with frequency converter, this frequency converter is by the 3rd four-quadrant power switch S 3With the 4th four-quadrant power switch S 4Constitute, the output voltage of the multi-level converter that will isolate, transmit through high frequency transformer is converted into many level of unipolarity output voltage u ABIn this frequency converter, the 3rd four-quadrant power switch S 3An end and the secondary winding N of high frequency transformer 2An end connect, the other end respectively with the 4th four-quadrant power switch S 4With output inductor L fBe connected the 4th four-quadrant power switch S 4The other end and secondary winding N 2The other end connect; This output inductor L fThe other end respectively with output filter capacitor C fWith output AC load Z LOne end connects, this output filter capacitor C f, output AC load Z LThe other end and secondary winding N 2The other end or centre tap be connected; Described output inductor L fWith output filter capacitor C fConstitute output filter, the output voltage u of the described frequency converter of this output filter filtering ABIn high order harmonic component, thereby obtain sinusoidal voltage u in the output AC load-side o
Friendship-friendship type three-level AC-the AC-AC converter that the present invention is based on forward converter is applied to the positive activation type circuit topology that the high pressure friendship-alternation carry over of high frequency electrical isolation closes, and promptly imports high-voltage ac power u iAn end and input filter inductance L iOne end connects, this input filter inductance L iThe other end respectively with input filter capacitor C i, the May 4th quadrant power switch S 5, four-quadrant clamp power switch S cElementary winding N with high frequency transformer T 1An end be connected; This input filter capacitor C iThe other end respectively with this input high-voltage ac power u iThe other end, feedback winding N 3An end, the second four-quadrant power switch S 2An end connect; Described input filter inductance L iWith input filter capacitor C iConstitute input filter; This May 4th quadrant power switch S 5The other end and described feedback winding N 3The other end connect; This four-quadrant clamp power switch S cThe other end respectively with the second four-quadrant power switch S 2The other end, the first four-quadrant power switch S 1One end connects; This first four-quadrant power switch S 1The other end and the elementary winding N of high frequency transformer 1The other end connect; The described first four-quadrant power switch S 1, the second four-quadrant power switch S 2With four-quadrant clamp power switch S cConstitute multi-level converter; The output filter capacitor C of output filter f, output AC load Z LThe other end respectively with secondary winding N 2The 4th four-quadrant power switch S with frequency converter 4The other end connect.
Friendship-friendship type three-level AC-the AC-AC converter that the present invention is based on forward converter is applied to the push-pull circuit topology that the high pressure friendship-alternation carry over of high frequency electrical isolation closes, and promptly imports high-voltage ac power u iAn end and input filter inductance L iOne end connects, this input filter inductance L iThe other end respectively with input filter capacitor C i, the first four-quadrant clamp power switch S C1With the second four-quadrant clamp power switch S C2An end and the elementary winding N of high frequency transformer T 1Centre tap be connected; This input filter capacitor C iThe other end respectively with input high-voltage ac power u iThe other end, the second four-quadrant power switch S 2, the 6th four-quadrant power switch S 6Connect described input filter inductance L iWith input filter capacitor C iConstitute input filter; This second four-quadrant power switch S 2The other end respectively with the first four-quadrant power switch S 1One end and the first four-quadrant clamp power switch S C1The other end is connected, this first four-quadrant power switch S 1The other end and elementary winding N 1An end connect; Described the 6th four-quadrant power switch S 6The other end respectively with the 7th four-quadrant power switch S 7One end and the second four-quadrant clamp power switch S C2The other end connects; The 7th four-quadrant power switch S 7The other end and elementary winding N 1The other end be connected; The described first four-quadrant power switch S 1, the second four-quadrant power switch S 2, the first four-quadrant clamp power switch S C1, the 6th four-quadrant power switch S 6, the 7th four-quadrant power switch S 7With the second four-quadrant clamp power switch S C2Common formation multi-level converter, the wherein first four-quadrant power switch S 1, the second four-quadrant power switch S 2With the first four-quadrant clamp power switch S C1Constitute the first basic comprising unit of this multi-level converter, the 6th four-quadrant power switch S 6, the 7th four-quadrant power switch S 7With the second four-quadrant clamp power switch S C2Constitute the second basic comprising unit of this multi-level converter; The output filter capacitor C of output filter f, output AC load Z LThe other end and secondary winding N 2Centre tap connect.
Friendship-friendship type three-level AC-the AC-AC converter that the present invention is based on forward converter is applied to the half bridge circuit topology that the high pressure friendship-alternation carry over of high frequency electrical isolation closes, and promptly imports high-voltage ac power u iAn end and input filter inductance L iOne end connects, this input filter inductance L iThe other end respectively with the first input filter capacitor C 1With the second four-quadrant power switch S 2An end be connected; This first input filter capacitor C 1The other end respectively with the second input filter capacitor C 2, the 3rd four-quadrant clamp power switch S C3, the 4th four-quadrant clamp power switch S C4, high frequency transformer T elementary winding N 1An end connect; Described input filter inductance L i, the first input filter capacitor C 1With the second input filter capacitor C 2Constitute input filter, to input high-voltage ac power u iFiltering, and the first input filter capacitor C 1With the second input filter capacitor C 2To input high-voltage ac power u iCarry out dividing potential drop; This second input filter capacitor C 2The other end respectively with input high-voltage ac power u iThe other end and the 8th four-quadrant power switch S 8One end connects; The described second four-quadrant power switch S 2The other end respectively with the 3rd four-quadrant clamp power switch S C3The other end and the first four-quadrant power switch S 1One end is connected; This first four-quadrant power switch S 1The other end respectively with elementary winding N 1The other end and the 9th four-quadrant power switch S 9One end connects, the 9th four-quadrant power switch S 9The other end respectively with the 4th four-quadrant clamp power switch S C4The other end, the 8th four-quadrant power switch S 8The other end connect; The described first four-quadrant power switch S 1, the second four-quadrant power switch S 2, the 3rd four-quadrant clamp power switch S C3, the 8th four-quadrant power switch S 8, the 9th four-quadrant power switch S 9With the 4th four-quadrant clamp power switch S C4Common formation multi-level converter, the wherein first four-quadrant power switch S 1, the second four-quadrant power switch S 2With the 3rd four-quadrant clamp power switch S C3Constitute the first basic comprising unit of this multi-level converter, the 9th four-quadrant power switch S 9, the 8th four-quadrant power switch S 8With the 4th four-quadrant clamp power switch S C4Constitute the second basic comprising unit of this multi-level converter; The output filter capacitor C of output filter f, output AC load Z LThe other end and secondary winding N 2Centre tap connect.
Friendship-friendship type three-level AC-the AC-AC converter that the present invention is based on forward converter is applied to the full bridge circuit topology that the high pressure friendship-alternation carry over of high frequency electrical isolation closes, and promptly imports high-voltage ac power u iAn end and input filter inductance L iOne end connects, this input filter inductance L iThe other end respectively with the first input filter capacitor C 1, the second four-quadrant power switch S 2With the 13 four-quadrant power switch S 13An end be connected; This first input filter capacitor C 1The other end respectively with the second input filter capacitor C 2, the May 4th quadrant clamp power switch S C5, the 6th four-quadrant clamp power switch S C6, the 7th four-quadrant clamp power switch S C7With the 8th four-quadrant clamp power switch S C8An end connect; Described input filter inductance L i, the first input filter capacitor C 1With the second input filter capacitor C 2Constitute input filter, to input high-voltage ac power u iFiltering, and the first input filter capacitor C 1With the second input filter capacitor C 2To input high-voltage ac power u iCarry out dividing potential drop; This second input filter capacitor C 2The other end respectively with input high-voltage ac power u iThe other end, the tenth four-quadrant power switch S 10One end and the 14 four-quadrant power switch S 14One end connects; The described second four-quadrant power switch S 2The other end respectively with the May 4th quadrant clamp power switch S C5The other end and the first four-quadrant power switch S 1One end is connected, this first four-quadrant power switch S 1The other end respectively with the elementary winding N of high frequency transformer T 1An end and the 11 four-quadrant power switch S 11One end connects, the 11 four-quadrant power switch S 11The other end respectively with the 6th four-quadrant clamp power switch S C6The other end, the tenth four-quadrant power switch S 10The other end connect; Described the 13 four-quadrant power switch S 13The other end respectively with the 7th four-quadrant clamp power switch S C7The other end and the 12 four-quadrant power switch S 12One end connects, the 12 four-quadrant power switch S 12The other end respectively with elementary winding N 1The other end and the tenth the May 4th quadrant power switch S 15One end connects, the tenth the May 4th quadrant power switch S 15The other end respectively with the 8th four-quadrant clamp power switch S C8The other end, the 14 four-quadrant power switch S 14The other end be connected; The described first four-quadrant power switch S 1, the second four-quadrant power switch S 2, the May 4th quadrant clamp power switch S C5, the tenth four-quadrant power switch S 10, the 11 four-quadrant power switch S 11, the 6th four-quadrant clamp power switch S C6, the 12 four-quadrant power switch S 12, the 13 four-quadrant power switch S 13, the 7th four-quadrant clamp power switch S C7, the 14 four-quadrant power switch S 14, the tenth the May 4th quadrant power switch S 15With the 8th four-quadrant clamp power switch S C8Common formation multi-level converter, the wherein first four-quadrant power switch S 1, the second four-quadrant power switch S 2With the May 4th quadrant clamp power switch S C5Constitute the first basic comprising unit of this multi-level converter; The tenth four-quadrant power switch S 10, the 11 four-quadrant power switch S 11With the 6th four-quadrant clamp power switch Sc 6Constitute the second basic comprising unit of this multi-level converter; The 12 four-quadrant power switch S 12, the 13 four-quadrant power switch S 13With the 7th four-quadrant clamp power switch S C7Constitute the 3rd basic comprising unit of this multi-level converter; The 14 four-quadrant power switch S 14, the tenth the May 4th quadrant power switch S 15With the 8th four-quadrant clamp power switch S C8Constitute the 4th basic comprising unit of this multi-level converter; The output filter capacitor C of output filter f, output AC load Z LThe other end and secondary winding N 2Centre tap connect.
The present invention compared with prior art, its remarkable advantage: the present invention is the key technology basis of realizing novel electric power electric transformer and simple alternating current voltage regulator etc., can the conversion occasion at the high pressure friendship-alternating current in fields such as civilian, national defence and industry, be with a wide range of applications.Because have that topology is succinct, advantages such as the terminal voltage spectral characteristic is good before the high frequency electrical isolation, two stage power conversion (low-frequency ac LFAC-high-frequency ac HFAC-low-frequency ac LFAC), bidirectional power flow, output filter, thereby with respect to the isolated friendship of intermediate frequency-straight-friendship type three-level AC-AC-AC converter, the present invention can improve conversion efficiency and power density, reduces volume and weight and improve the input side power factor; Owing to adopted three Level Technology, thereby with respect to two level friendship-AC-AC converters, the present invention can be applied to high pressure friendship-alternation carry over and close, and can reduce volume and weight, the raising output waveform quality of output filter greatly.
Below in conjunction with accompanying drawing the present invention is described in further detail.
Description of drawings
Fig. 1 is the circuit structure diagram of friendship-friendship type three-level AC-AC-AC converter of the present invention is based on forward converter.
Fig. 2 is the positive activation type topological diagram of friendship-friendship type three-level AC-AC-AC converter of the present invention is based on forward converter.
Fig. 3 is the push-pull type topological diagram of friendship-friendship type three-level AC-AC-AC converter of the present invention is based on forward converter.
Fig. 4 is the semibridge system topological diagram of friendship-friendship type three-level AC-AC-AC converter of the present invention is based on forward converter.
Fig. 5 is the full-bridge type topological diagram of friendship-friendship type three-level AC-AC-AC converter of the present invention is based on forward converter.
Embodiment
In conjunction with Fig. 1, the present invention is based on the friendship-friendship type three-level AC-AC-AC converter of forward converter, constitute by the input filter, multi-level converter, high frequency transformer, frequency converter, output filter and the output AC load that connect successively, this converter is transformed into stable or adjustable same frequency, high-quality sinusoidal ac with unsettled high pressure, alternating current inferior, and reduce Power Conversion progression, realize high frequency electrical isolation, be applied to the circuit structure that high pressure friendship-alternation carry over closes, promptly import filter inductance L iWith input filter capacitor C iConstitute input filter, this input filter is to input high-voltage ac power u iCarry out filtering, will be converted into many level of bipolarity output voltage u through the filtered input voltage of input filter N1Multi-level converter and the elementary winding N of high frequency transformer T 1Connect the secondary winding N of this high frequency transformer 2Be connected with frequency converter, this frequency converter is by the 3rd four-quadrant power switch S 3With the 4th four-quadrant power switch S 4Constitute, the output voltage of the multi-level converter that will isolate, transmit through high frequency transformer is converted into many level of unipolarity output voltage u ABIn this frequency converter, the 3rd four-quadrant power switch S 3An end and the secondary winding N of high frequency transformer 2An end connect, the other end respectively with the 4th four-quadrant power switch S 4With output inductor L fBe connected the 4th four-quadrant power switch S 4The other end and secondary winding N 2The other end connect; This output inductor L fThe other end respectively with output filter capacitor C fWith output AC load Z LOne end connects, this output filter capacitor C f, output AC load Z LThe other end and secondary winding N 2The other end or centre tap be connected; Described output inductor L fWith output filter capacitor C fConstitute output filter, the output voltage u of the described frequency converter of this output filter filtering ABIn high order harmonic component, thereby obtain high-quality sinusoidal voltage u in the output AC load-side o
With respect to the isolated friendship of intermediate frequency-straight-many level friendship-AC-AC converters of friendship type, circuit structure of the present invention only has two stage power conversion (low-frequency ac LFAC-high-frequency ac HFAC-low-frequency ac LFAC) and has high frequency electrical isolation, thereby this converter can improve input side power factor, conversion efficiency, power density and reliability, and reduces volume, weight.Because circuit structure of the present invention adopts the four-quadrant power switch to replace single power switch, thereby can realize half that bidirectional power flow and its each single voltage stress that power switch bore are two level friendship-AC-AC converters, close thereby can be widely used in high pressure friendship-alternation carry over.In addition, with respect to two level friendship-AC-AC converters, because the output voltage of the frequency converter in the circuit structure of the present invention is the voltage waveform of many level, has improved spectral characteristic, thereby can reduce the volume and weight of output filter and improve the output waveform quality.
The basic functional principle of friendship-friendship type three-level AC-AC-AC converter that the present invention is based on forward converter is as follows: this converter can adopt pulse-width modulation (PWM) copped wave of active-clamp to add the control mode of phase shift.As unsettled high pressure, AC power u inferior iTo exchanging output loading Z LDuring transmitted power, multi-level converter is modulated into bipolarity, many level (u with it i, u i/ 2,0 ,-u i/ 2 ,-u i) high-frequency pulse voltage u N1, to isolate, transmit through high frequency transformer, frequency converter is demodulated into unipolarity, many level
Figure C200710020946D00121
Low-frequency pulse voltage u AB, behind output filter, obtain stable or adjustable same frequency, high-quality sinusoidal voltage u again o
Friendship based on forward converter proposed by the invention, that have the foregoing circuit structure-friendship type three-level AC-AC-AC converter, the connection successively of process input filter, one or more basic comprisings unit, high frequency transformer, frequency converter and output filter can obtain comprising the circuit topology family of positive activation type, push-pull type, semibridge system and four kinds of circuit topologies of full-bridge type, but all topologys in this circuit topology family all have identical circuit structure.
Wherein, the positive activation type circuit topology as shown in Figure 2, its physical circuit connects as follows: be applied to the positive activation type circuit topology that the high pressure friendship-alternation carry over of high frequency electrical isolation closes based on the friendship-friendship type three-level AC-AC-AC converter of forward converter, promptly import high-voltage ac power u iAn end and input filter inductance L iOne end connects, this input filter inductance L iThe other end respectively with input filter capacitor C i, the May 4th quadrant power switch S 5, four-quadrant clamp power switch S cElementary winding N with high frequency transformer T 1An end be connected; This input filter capacitor C iThe other end respectively with this input high-voltage ac power u iThe other end, feedback winding N 3An end, the second four-quadrant power switch S 2An end connect; Described input filter inductance L iWith input filter capacitor C iConstitute input filter; This May 4th quadrant power switch S 5The other end and described feedback winding N 3The other end connect; This four-quadrant clamp power switch S cThe other end respectively with the second four-quadrant power switch S 2The other end, the first four-quadrant power switch S 1One end connects; This first four-quadrant power switch S 1The other end and the elementary winding N of high frequency transformer 1The other end connect; The described first four-quadrant power switch S 1, the second four-quadrant power switch S 2With four-quadrant clamp power switch S cConstitute multi-level converter.The secondary winding N of this high frequency transformer 2Be connected with frequency converter, this frequency converter is by the 3rd four-quadrant power switch S 3With the 4th four-quadrant power switch S 4Constitute, the output voltage of the multi-level converter that will isolate, transmit through high frequency transformer is converted into many level of unipolarity output voltage u ABIn this frequency converter, the 3rd four-quadrant power switch S 3An end and the secondary winding N of high frequency transformer 2An end connect, the other end respectively with the 4th four-quadrant power switch S 4With output inductor L fBe connected the 4th four-quadrant power switch S 4The other end and secondary winding N 2The other end connect; This output inductor L fThe other end respectively with output filter capacitor C fWith output AC load Z LOne end connects, this output filter capacitor C f, output AC load Z LThe other end and secondary winding N 2The other end or centre tap be connected; Described output inductor L fWith output filter capacitor C fConstitute output filter, the output voltage u of the described frequency converter of this output filter filtering ABIn high order harmonic component, thereby obtain high-quality sinusoidal voltage u in the output AC load-side oThe output filter capacitor C of output filter f, output AC load Z LThe other end respectively with secondary winding N 2The 4th four-quadrant power switch S with frequency converter 4The other end connect.The first four-quadrant power switch S wherein 1, the second four-quadrant power switch S 2With four-quadrant clamp power switch S cConstitute the basic comprising unit of this multi-level converter.
The push-pull circuit topology as shown in Figure 3, its physical circuit connects as follows: be applied to the push-pull circuit topology that the high pressure friendship-alternation carry over of high frequency electrical isolation closes based on the friendship-friendship type three-level AC-AC-AC converter of forward converter, promptly import high-voltage ac power u iAn end and input filter inductance L iOne end connects, this input filter inductance L iThe other end respectively with input filter capacitor C i, the first four-quadrant clamp power switch S C1With the second four-quadrant clamp power switch S C2An end and the elementary winding N of high frequency transformer T 1Centre tap be connected; This input filter capacitor C iThe other end respectively with input high-voltage ac power u iThe other end, the second four-quadrant power switch S 2, the 6th four-quadrant power switch S 6Connect described input filter inductance L iWith input filter capacitor C iConstitute input filter; This second four-quadrant power switch S 2The other end respectively with the first four-quadrant power switch S 1One end and the first four-quadrant clamp power switch S C1The other end is connected, this first four-quadrant power switch S 1The other end and elementary winding N 1An end connect; Described the 6th four-quadrant power switch S 6The other end respectively with the 7th four-quadrant power switch S 7One end and the second four-quadrant clamp power switch S C2The other end connects; The 7th four-quadrant power switch S 7The other end and elementary winding N 1The other end be connected; The described first four-quadrant power switch S 1, the second four-quadrant power switch S 2, the first four-quadrant clamp power switch S C1The 6th four-quadrant power switch S 6, the 7th four-quadrant power switch S 7With the second four-quadrant clamp power switch S C2With constituting multi-level converter, the wherein first four-quadrant power switch S 1, the second four-quadrant power switch S 2With the first four-quadrant clamp power switch S C1Become the first basic comprising unit of this multi-level converter, the 6th four-quadrant power switch S 6, the 7th four-quadrant power switch S 7With the second four-quadrant clamp power switch S C2Become the second basic comprising unit of this multi-level converter.The secondary winding N of this high frequency transformer 2Be connected with frequency converter, this frequency converter is by the 3rd four-quadrant power switch S 3With the 4th four-quadrant power switch S 4Constitute, the output voltage of the multi-level converter that will isolate, transmit through high frequency transformer is converted into many level of unipolarity output voltage u ABIn this frequency converter, the 3rd four-quadrant power switch S 3An end and the secondary winding N of high frequency transformer 2An end connect, the other end respectively with the 4th four-quadrant power switch S 4With output inductor L fBe connected the 4th four-quadrant power switch S 4The other end and secondary winding N 2The other end connect; This output inductor L fThe other end respectively with output filter capacitor C fWith output AC load Z LOne end connects, this output filter capacitor C f, output AC load Z LThe other end and secondary winding N 2The other end or centre tap be connected; Described output inductor L fWith output filter capacitor C fConstitute output filter, the output voltage u of the described frequency converter of this output filter filtering ABIn high order harmonic component, thereby obtain high-quality sinusoidal voltage u in the output AC load-side oThe output filter capacitor C of output filter f, output AC load Z LThe other end and secondary winding N 2Centre tap connect.
The half bridge circuit topology as shown in Figure 4, its physical circuit connects as follows: be applied to the half bridge circuit topology that the high pressure friendship-alternation carry over of high frequency electrical isolation closes based on the friendship-friendship type three-level AC-AC-AC converter of forward converter, promptly import high-voltage ac power u iAn end and input filter inductance L iOne end connects, this input filter inductance L iThe other end respectively with the first input filter capacitor C 1With the second four-quadrant power switch S 2An end be connected; This first input filter capacitor C 1The other end respectively with the second input filter capacitor C 2, the 3rd four-quadrant clamp power switch S C3, the 4th four-quadrant clamp power switch S C4, high frequency transformer T elementary winding N 1An end connect; Described input filter inductance L i, the first input filter capacitor C 1With the second input filter capacitor C 2Constitute input filter, to input high-voltage ac power u iFiltering, and the first input filter capacitor C 1With the second input filter capacitor C 2To input high-voltage ac power u iCarry out dividing potential drop; This second input filter capacitor C 2The other end respectively with input high-voltage ac power u iThe other end and the 8th four-quadrant power switch S 8One end connects; The described second four-quadrant power switch S 2The other end respectively with the 3rd four-quadrant clamp power switch S C3The other end and the first four-quadrant power switch S 1One end is connected; This first four-quadrant power switch S 1The other end respectively with elementary winding N 1The other end and the 9th four-quadrant power switch S 9One end connects, the 9th four-quadrant power switch S 9The other end respectively with the 4th four-quadrant clamp power switch S C4The other end, the 8th four-quadrant power switch S 8The other end connect; The described first four-quadrant power switch S 1, the second four-quadrant power switch S 2, the 3rd four-quadrant clamp power switch S C3, the 8th four-quadrant power switch S 8, the 9th four-quadrant power switch S 9With the 4th four-quadrant clamp power switch S C4Common formation multi-level converter, the wherein first four-quadrant power switch S 1, the second four-quadrant power switch S 2With the 3rd four-quadrant clamp power switch S C3The first basic comprising unit of multi-level converter, the 9th four-quadrant power switch S 9, the 8th four-quadrant power switch S 8With the 4th four-quadrant clamp power switch S C4Constitute the second basic comprising unit of this multi-level converter.The secondary winding N of this high frequency transformer 2Be connected with frequency converter, this frequency converter is by the 3rd four-quadrant power switch S 3With the 4th four-quadrant power switch S 4Constitute, the output voltage of the multi-level converter that will isolate, transmit through high frequency transformer is converted into many level of unipolarity output voltage u ABIn this frequency converter, the 3rd four-quadrant power switch S 3An end and the secondary winding N of high frequency transformer 2An end connect, the other end respectively with the 4th four-quadrant power switch S 4With output inductor L fBe connected the 4th four-quadrant power switch S 4The other end and secondary winding N 2The other end connect; This output inductor L fThe other end respectively with output filter capacitor C fWith output AC load Z LOne end connects, this output filter capacitor C f, output AC load Z LThe other end and secondary winding N 2The other end or centre tap be connected; Described output inductor L fWith output filter capacitor C fConstitute output filter, the output voltage u of the described frequency converter of this output filter filtering ABIn high order harmonic component, thereby obtain high-quality sinusoidal voltage u in the output AC load-side oThe output filter capacitor C of output filter f, output AC load Z LThe other end and secondary winding N 2Centre tap connect.
The full bridge circuit topology as shown in Figure 5, its physical circuit connects as follows: be applied to the full bridge circuit topology that the high pressure friendship-alternation carry over of high frequency electrical isolation closes based on the friendship-friendship type three-level AC-AC-AC converter of forward converter, promptly import high-voltage ac power u iAn end and input filter inductance L iOne end connects, this input filter inductance L iThe other end respectively with the first input filter capacitor C 1, the second four-quadrant power switch S 2With the 13 four-quadrant power switch S 13An end be connected; This first input filter capacitor C 1The other end respectively with the second input filter capacitor C 2, the May 4th quadrant clamp power switch S C5, the 6th four-quadrant clamp power switch S C6, the 7th four-quadrant clamp power switch S C7With the 8th four-quadrant clamp power switch S C8An end connect; Described input filter inductance L i, the first input filter capacitor C 1With the second input filter capacitor C 2Constitute input filter, to input high-voltage ac power u iFiltering, and the first input filter capacitor C 1With the second input filter capacitor C 2To input high-voltage ac power u iCarry out dividing potential drop; This second input filter capacitor C 2The other end respectively with input high-voltage ac power u iThe other end, the tenth four-quadrant power switch S 10One end and the 14 four-quadrant power switch S 14One end connects; The described second four-quadrant power switch S 2The other end respectively with the May 4th quadrant clamp power switch S C5The other end and the first four-quadrant power switch S 1One end is connected, this first four-quadrant power switch S 1The other end respectively with the elementary winding N of high frequency transformer T 1An end and the 11 four-quadrant power switch S 11One end connects, the 11 four-quadrant power switch S 11The other end respectively with the 6th four-quadrant clamp power switch S C6The other end, the tenth four-quadrant power switch S 10The other end connect; Described the 13 four-quadrant power switch S 13The other end respectively with the 7th four-quadrant clamp power switch S C7The other end and the 12 four-quadrant power switch S 12One end connects, the 12 four-quadrant power switch S 12The other end respectively with elementary winding N 1The other end and the tenth the May 4th quadrant power switch S 15One end connects, the tenth the May 4th quadrant power switch S 15The other end respectively with the 8th four-quadrant clamp power switch S C8The other end, the 14 four-quadrant power switch S 14The other end be connected; The described first four-quadrant power switch S 1, the second four-quadrant power switch S 2, the May 4th quadrant clamp power switch S C5, the tenth four-quadrant power switch S 10, the 11 four-quadrant power switch S 11, the 6th four-quadrant clamp power switch S C6, the 12 four-quadrant power switch S 12, the 13 four-quadrant power switch S 13, the 7th four-quadrant clamp power switch S C7, the 14 four-quadrant power switch S 14, the tenth the May 4th quadrant power switch S 15With the 8th four-quadrant clamp power switch S C8Common formation multi-level converter, the wherein first four-quadrant power switch S 1, the second four-quadrant power switch S 2With the May 4th quadrant clamp power switch S C5Constitute the first basic comprising unit of this multi-level converter; The tenth four-quadrant power switch S 10, the 11 four-quadrant power switch S 11With the 6th four-quadrant clamp power switch S C6Constitute the second basic comprising unit of this multi-level converter; The 12 four-quadrant power switch S 12, the 13 four-quadrant power switch S 13With the 7th four-quadrant clamp power switch S C7Constitute the 3rd basic comprising unit of this multi-level converter; The 14 four-quadrant power switch S 14, the tenth the May 4th quadrant power switch S 15With the 8th four-quadrant clamp power switch S C8Constitute the 4th basic comprising unit of this multi-level converter.The secondary winding N of this high frequency transformer 2Be connected with frequency converter, this frequency converter is by the 3rd four-quadrant power switch S 3With the 4th four-quadrant power switch S 4Constitute, the output voltage of the multi-level converter that will isolate, transmit through high frequency transformer is converted into many level of unipolarity output voltage u ABIn this frequency converter, the 3rd four-quadrant power switch S 3An end and the secondary winding N of high frequency transformer 2An end connect, the other end respectively with the 4th four-quadrant power switch S 4With output inductor L fBe connected the 4th four-quadrant power switch S 4The other end and secondary winding N 2The other end connect; This output inductor L fThe other end respectively with output filter capacitor C fWith output AC load Z LOne end connects, this output filter capacitor C f, output AC load Z LThe other end and secondary winding N 2The other end or centre tap be connected; Described output inductor L fWith output filter capacitor C fConstitute output filter, the output voltage u of the described frequency converter of this output filter filtering ABIn high order harmonic component, thereby obtain high-quality sinusoidal voltage u in the output AC load-side oThe output filter capacitor C of output filter f, output AC load Z LThe other end and secondary winding N 2Centre tap connect.
Each all four-quadrant power switchs constitutes by two single power switch differential concatenations and bears forward, reverse voltage stress and the switch of current stress in above-mentioned friendship based on forward converter-friendship type three-level AC-AC-AC converter.

Claims (6)

1、一种基于正激变换器的交—交型三电平交—交变换器，其特征在于：该变换器由依次连接的输入滤波器、多电平变换器、高频变压器、周波变换器、输出滤波器和输出交流负载构成，该变换器将交流电变换成正弦交流电，并降低功率变换级数、实现高频电气隔离、应用于高压交—交变换场合的电路结构，即输入滤波电感[Li]和输入滤波电容[Ci]构成输入滤波器，该输入滤波器对输入高压交流电源[ui]进行滤波，将经输入滤波器滤波后的输入电压转化为双极性多电平输出电压[uN1]的多电平变换器与高频变压器[T]的初级绕组[N1]连接，该高频变压器的次级绕组[N2]与周波变换器连接，该周波变换器由第三四象限功率开关[S3]和第四四象限功率开关[S4]构成，将经高频变压器隔离、传输的多电平变换器的输出电压转化为单极性多电平输出电压[uAB]；在该周波变换器中，第三四象限功率开关[S3]的一端与高频变压器的次级绕组[N2]的一端连接，另一端分别与第四四象限功率开关[S4]和输出滤波电感[Lf]相连接，该第四四象限功率开关[S4]的另一端和次级绕组[N2]的另一端连接；该输出滤波电感[Lf]的另一端分别与输出滤波电容[Cf]和输出交流负载[ZL]一端连接，该输出滤波电容[Cf]、输出交流负载[ZL]的另一端与次级绕组[N2]的另一端或者中间抽头相连接；所述的输出滤波电感[Lf]和输出滤波电容[Cf]构成输出滤波器，该输出滤波器滤除所述的周波变换器的输出电压[uAB]中的高次谐波，从而在输出交流负载侧得到正弦交流电压[uo]。1. An AC-AC three-level AC-AC converter based on a forward converter, characterized in that: the converter consists of sequentially connected input filters, multilevel converters, high-frequency transformers, and cycle converters Converter, output filter and output AC load, the converter converts AC into sinusoidal AC, reduces the number of power conversion stages, realizes high-frequency electrical isolation, and is applied to the circuit structure of high-voltage AC-AC conversion occasions, that is, the input filter inductance [L i ] and input filter capacitor [C i ] constitute an input filter, which filters the input high-voltage AC power [u i ], and converts the input voltage filtered by the input filter into bipolar multi-voltage The multilevel converter with flat output voltage [u N1 ] is connected to the primary winding [N 1 ] of the high frequency transformer [T], the secondary winding [N 2 ] of the high frequency transformer is connected to the cycloconverter, which converts The device is composed of the third four-quadrant power switch [S 3 ] and the fourth four-quadrant power switch [S 4 ], which convert the output voltage of the multi-level converter isolated and transmitted by the high-frequency transformer into a unipolar multi-level output voltage [u AB ]; in this cycloconverter, one end of the third four-quadrant power switch [S 3 ] is connected to one end of the secondary winding [N 2 ] of the high-frequency transformer, and the other end is respectively connected to the fourth four-quadrant The power switch [S 4 ] is connected to the output filter inductor [L f ], and the other end of the fourth four-quadrant power switch [S 4 ] is connected to the other end of the secondary winding [N 2 ]; the output filter inductor [L The other end of f ] is respectively connected to one end of the output filter capacitor [C f ] and the output AC load [Z L ], and the other end of the output filter capacitor [C f ], the output AC load [Z L ] is connected to the secondary winding [N 2 ] connected to the other end or the middle tap; the output filter inductance [L f ] and the output filter capacitor [C f ] constitute an output filter, which filters out the output voltage of the cycloconverter [ u AB ] in the high-order harmonics, so that the sinusoidal AC voltage [u o ] is obtained on the output AC load side. 2、根据权利要求1所述的基于正激变换器的交—交型三电平交—交变换器，其特征在于：该变换器应用于高频电气隔离的高压交—交变换场合的正激式电路拓扑，即输入高压交流电源[ui]的一端与输入滤波电感[Li]一端连接，该输入滤波电感[Li]的另一端分别与输入滤波电容[Ci]、第五四象限功率开关[S5]、四象限箝位功率开关[Sc]和高频变压器[T]的初级绕组[N1]的一端相连接；该输入滤波电容[Ci]的另一端分别与该输入高压交流电源[ui]的另一端、回馈绕组[N3]的一端、第二四象限功率开关[S2]的一端连接；所述的输入滤波电感[Li]和输入滤波电容[Ci]构成输入滤波器；该第五四象限功率开关[S5]的另一端与所述的回馈绕组[N3]的另一端连接；该四象限箝位功率开关[Sc]的另一端分别与第二四象限功率开关[S2]另一端、第一四象限功率开关[S1]一端连接；该第一四象限功率开关[S1]的另一端与高频变压器的初级绕组[N1]的另一端连接；所述的第一四象限功率开关[S1]、第二四象限功率开关[S2]和四象限箝位功率开关[Sc]构成多电平变换器；输出滤波器的输出滤波电容[Cf]、输出交流负载[ZL]的另一端分别与次级绕组[N2]和周波变换器的第四四象限功率开关[S4]的另一端连接。2. The AC-AC three-level AC-AC converter based on the forward converter according to claim 1, characterized in that: the converter is applied to the high-voltage AC-AC conversion occasion of high frequency electrical isolation. Excited circuit topology, that is, one end of the input high-voltage AC power [u i ] is connected to one end of the input filter inductance [L i ], and the other end of the input filter inductance [L i ] is respectively connected to the input filter capacitor [C i ], the fifth One end of the four-quadrant power switch [S 5 ], the four-quadrant clamp power switch [S c ] and the primary winding [N 1 ] of the high-frequency transformer [T] are connected; the other end of the input filter capacitor [C i ] is respectively Connect with the other end of the input high-voltage AC power supply [u i ], one end of the feedback winding [N 3 ], and one end of the second four-quadrant power switch [S 2 ]; the input filter inductor [L i ] and input filter The capacitor [C i ] forms an input filter; the other end of the fifth four-quadrant power switch [S 5 ] is connected to the other end of the feedback winding [N 3 ]; the four-quadrant clamp power switch [S c ] The other end of the second four-quadrant power switch [S 2 ] is connected to the other end of the first four-quadrant power switch [S 1 ]; the other end of the first four-quadrant power switch [S 1 ] is connected to the high-frequency transformer The other end of the primary winding [N 1 ] is connected; the first four-quadrant power switch [S 1 ], the second four-quadrant power switch [S 2 ] and the four-quadrant clamp power switch [S c ] constitute a multi-level converter; the output filter capacitor [C f ] of the output filter, the other end of the output AC load [Z L ] are respectively connected to the secondary winding [N 2 ] and the fourth four-quadrant power switch [S 4 ] of the cycloconverter Connect the other end. 3、根据权利要求1所述的基于正激变换器的交—交型三电平交—交变换器，其特征在于：该变换器应用于高频电气隔离的高压交—交变换场合的推挽式电路拓扑，即输入高压交流电源[ui]的一端与输入滤波电感[Li]一端连接，该输入滤波电感[Li]的另一端分别与输入滤波电容[Ci]、第一四象限箝位功率开关[Sc1]和第二四象限箝位功率开关[Sc2]的一端以及高频变压器[T]的初级绕组[N1]的中间抽头相连接；该输入滤波电容[Ci]的另一端分别与输入高压交流电源[ui]的另一端、第二四象限功率开关[S2]、第六四象限功率开关[S6]连接，所述的输入滤波电感[Li]和输入滤波电容[Ci]构成输入滤波器；该第二四象限功率开关[S2]的另一端分别与第一四象限功率开关[S1]一端和第一四象限箝位功率开关[Sc1]另一端相连接，该第一四象限功率开关[S1]的另一端和初级绕组[N1]的一端连接；所述的第六四象限功率开关[S6]的另一端分别与第七四象限功率开关[S7]一端和第二四象限箝位功率开关[Sc2]另一端连接；该第七四象限功率开关[S7]另一端和初级绕组[N1]的另一端相连接；所述的第一四象限功率开关[S1]、第二四象限功率开关[S2]、第一四象限箝位功率开关[Sc1]、第六四象限功率开关[S6]、第七四象限功率开关[S7]和第二四象限箝位功率开关[Sc2]共同构成多电平变换器，其中第一四象限功率开关[S1]、第二四象限功率开关[S2]和第一四象限箝位功率开关[Sc1]构成该多电平变换器的第一基本构成单元，第六四象限功率开关[S6]、第七四象限功率开关[S7]和第二四象限箝位功率开关[Sc2]构成该多电平变换器的第二基本构成单元；输出滤波器的输出滤波电容[Cf]、输出交流负载[ZL]的另一端与次级绕组[N2]的中间抽头连接。3. The AC-AC three-level AC-AC converter based on the forward converter according to claim 1, characterized in that: the converter is applied to high-voltage AC-AC conversion occasions with high-frequency electrical isolation. Pull-type circuit topology, that is, one end of the input high-voltage AC power [u i ] is connected to one end of the input filter inductor [L i ], and the other end of the input filter inductor [L i ] is respectively connected to the input filter capacitor [C i ], the first The four-quadrant clamp power switch [S c1 ] is connected with one end of the second four-quadrant clamp power switch [S c2 ] and the middle tap of the primary winding [N 1 ] of the high-frequency transformer [T]; the input filter capacitor [ The other end of C i ] is respectively connected to the other end of the input high-voltage AC power supply [u i ], the second four-quadrant power switch [S 2 ], and the sixth four-quadrant power switch [S 6 ]. The input filter inductor [ L i ] and input filter capacitor [C i ] constitute an input filter; the other end of the second four-quadrant power switch [S 2 ] is respectively connected to one end of the first four-quadrant power switch [S 1 ] and the first four-quadrant clamp The other end of the power switch [S c1 ] is connected, and the other end of the first four-quadrant power switch [S 1 ] is connected to one end of the primary winding [N 1 ]; the sixth four-quadrant power switch [S 6 ] The other end is respectively connected to one end of the seventh four-quadrant power switch [S 7 ] and the other end of the second four-quadrant clamp power switch [S c2 ]; the other end of the seventh four-quadrant power switch [S 7 ] is connected to the primary winding [N 1 ] connected to the other end; the first four-quadrant power switch [S 1 ], the second four-quadrant power switch [S 2 ], the first four-quadrant clamp power switch [S c1 ], the sixth four-quadrant The power switch [S 6 ], the seventh four-quadrant power switch [S 7 ] and the second four-quadrant clamp power switch [S c2 ] together constitute a multilevel converter, wherein the first four-quadrant power switch [S 1 ], The second four-quadrant power switch [S 2 ] and the first four-quadrant clamp power switch [S c1 ] constitute the first basic unit of the multilevel converter, the sixth four-quadrant power switch [S 6 ], the seventh The four-quadrant power switch [S 7 ] and the second four-quadrant clamp power switch [S c2 ] constitute the second basic unit of the multilevel converter; the output filter capacitor [C f ] of the output filter, the output AC load The other end of [Z L ] is connected to the middle tap of the secondary winding [N 2 ]. 4、根据权利要求1所述的基于正激变换器的交—交型三电平交—交变换器，其特征在于：该变换器应用于高频电气隔离的高压交—交变换场合的半桥式电路拓扑，即输入高压交流电源[ui]的一端与输入滤波电感[Li]一端连接，该输入滤波电感[Li]的另一端分别与第一输入滤波电容[C1]和第二四象限功率开关[S2]的一端相连接；该第一输入滤波电容[C1]的另一端分别与第二输入滤波电容[C2]、第三四象限箝位功率开关[Sc3]、第四四象限箝位功率开关[Sc4]、高频变压器[T]的初级绕组[N1]的一端连接；所述的输入滤波电感[Li]、第一输入滤波电容[C1]和第二输入滤波电容[C2]构成输入滤波器，对输入高压交流电源[ui]滤波，且第一输入滤波电容[C1]和第二输入滤波电容[C2]对输入高压交流电源[ui]进行分压；该第二输入滤波电容[C2]的另一端分别与输入高压交流电源[ui]另一端和第八四象限功率开关[S8]一端连接；所述的第二四象限功率开关[S2]的另一端分别和第三四象限箝位功率开关[Sc3]另一端和第一四象限功率开关[S1]一端相连接；该第一四象限功率开关[S1]的另一端分别与初级绕组[N1]另一端和第九四象限功率开关[S9]一端连接，该第九四象限功率开关[S9]的另一端分别与第四四象限箝位功率开关[Sc4]的另一端、第八四象限功率开关[S8]的另一端连接；所述的第一四象限功率开关[S1]、第二四象限功率开关[S2]、第三四象限箝位功率开关[Sc3]、第八四象限功率开关[S8]、第九四象限功率开关[S9]和第四四象限箝位功率开关[Sc4]共同构成多电平变换器，其中第一四象限功率开关[S1]、第二四象限功率开关[S2]和第三四象限箝位功率开关[Sc3]构成该多电平变换器的第一基本构成单元，第九四象限功率开关[S9]、第八四象限功率开关[S8]和第四四象限箝位功率开关[Sc4]构成该多电平变换器的第二基本构成单元；输出滤波器的输出滤波电容[Cf]、输出交流负载[ZL]的另一端与次级绕组[N2]的中间抽头连接。4. The AC-AC three-level AC-AC converter based on the forward converter according to claim 1, characterized in that: the converter is applied to half Bridge circuit topology, that is, one end of the input high-voltage AC power [u i ] is connected to one end of the input filter inductor [L i ], and the other end of the input filter inductor [L i ] is respectively connected to the first input filter capacitor [C 1 ] and One end of the second four-quadrant power switch [S 2 ] is connected; the other end of the first input filter capacitor [C 1 ] is respectively connected to the second input filter capacitor [C 2 ], the third four-quadrant clamp power switch [S c3 ], the fourth four-quadrant clamp power switch [S c4 ], and one end of the primary winding [N 1 ] of the high-frequency transformer [T] are connected; the input filter inductor [L i ], the first input filter capacitor [ C 1 ] and the second input filter capacitor [C 2 ] form an input filter to filter the input high-voltage AC power supply [u i ], and the first input filter capacitor [C 1 ] and the second input filter capacitor [C 2 ] pair Input high-voltage AC power [u i ] for voltage division; the other end of the second input filter capacitor [C 2 ] is respectively connected to the other end of the input high-voltage AC power [u i ] and one end of the eighth-fourth quadrant power switch [S 8 ] ; The other end of the second four-quadrant power switch [S 2 ] is respectively connected to the other end of the third four-quadrant clamp power switch [S c3 ] and one end of the first four-quadrant power switch [S 1 ]; The other end of a four-quadrant power switch [S 1 ] is respectively connected to the other end of the primary winding [N 1 ] and one end of the ninth four-quadrant power switch [S 9 ], and the other end of the ninth four-quadrant power switch [S 9 ] respectively connected to the other end of the fourth four-quadrant clamp power switch [S c4 ] and the other end of the eighth four-quadrant power switch [S 8 ]; the first four-quadrant power switch [S 1 ], the second four Quadrant power switch [S 2 ], third four-quadrant clamp power switch [S c3 ], eighth four-quadrant power switch [S 8 ], ninth four-quadrant power switch [S 9 ] and fourth four-quadrant clamp power The switches [S c4 ] together constitute a multilevel converter, wherein the first four-quadrant power switch [S 1 ], the second four-quadrant power switch [S 2 ] and the third four-quadrant clamp power switch [S c3 ] constitute the The first basic building block of the multilevel converter, the ninth four-quadrant power switch [S 9 ], the eighth four-quadrant power switch [S 8 ] and the fourth four-quadrant clamp power switch [S c4 ] constitute the multi-level converter. The second basic constituent unit of the level converter; the output filter capacitor [C f ] of the output filter, the other end of the output AC load [Z L ] is connected to the middle tap of the secondary winding [N 2 ]. 5、根据权利要求1所述的基于正激变换器的交—交型三电平交—交变换器，其特征在于：该变换器应用于高频电气隔离的高压交—交变换场合的全桥式电路拓扑，即输入高压交流电源[ui]的一端与输入滤波电感[Li]一端连接，该输入滤波电感[Li]的另一端分别与第一输入滤波电容[C1]、第二四象限功率开关[S2]和第十三四象限功率开关[S13]的一端相连接；该第一输入滤波电容[C1]的另一端分别与第二输入滤波电容[C2]、第五四象限箝位功率开关[Sc5]、第六四象限箝位功率开关[Sc6]、第七四象限箝位功率开关[Sc7]和第八四象限箝位功率开关[Sc8]的一端连接；所述的输入滤波电感[Li]、第一输入滤波电容[C1]和第二输入滤波电容[C2]构成输入滤波器，对输入高压交流电源[ui]滤波，且第一输入滤波电容[C1]和第二输入滤波电容[C2]对输入高压交流电源[ui]进行分压；该第二输入滤波电容[C2]的另一端分别与输入高压交流电源[ui]的另一端、第十四象限功率开关[S10]一端和第十四四象限功率开关[S14]一端连接；所述的第二四象限功率开关[S2]的另一端分别与第五四象限箝位功率开关[Sc5]的另一端和第一四象限功率开关[S1]一端相连接，该第一四象限功率开关[S1]的另一端分别与高频变压器[T]的初级绕组[N1]的一端和第十一四象限功率开关[S11]一端连接，该第十一四象限功率开关[S11]的另一端分别与第六四象限箝位功率开关[Sc6]的另一端、第十四象限功率开关[S10]的另一端连接；所述的第十三四象限功率开关[S13]的另一端分别与第七四象限箝位功率开关[Sc7]的另一端和第十二四象限功率开关[S12]一端连接，该第十二四象限功率开关[S12]的另一端分别与初级绕组[N1]的另一端和第十五四象限功率开关[S15]一端连接，该第十五四象限功率开关[S15]的另一端分别和第八四象限箝位功率开关[Sc8]的另一端、第十四四象限功率开关[S14]的另一端相连接；所述的第一四象限功率开关[S1]、第二四象限功率开关[S2]、第五四象限箝位功率开关[Sc5]、第十四象限功率开关[S10]、第十一四象限功率开关[S11]、第六四象限箝位功率开关[Sc6]、第十二四象限功率开关[S12]、第十三四象限功率开关[S13]、第七四象限箝位功率开关[Sc7]、第十四四象限功率开关[S14]、第十五四象限功率开关[S15]和第八四象限箝位功率开关[Sc8]共同构成多电平变换器，其中第一四象限功率开关[S1]、第二四象限功率开关[S2]和第五四象限箝位功率开关[Sc5]构成该多电平变换器的第一基本构成单元；第十四象限功率开关[S10]、第十一四象限功率开关[S11]和第六四象限箝位功率开关[Sc6]构成该多电平变换器的第二基本构成单元；第十二四象限功率开关[S12]、第十三四象限功率开关[S13]和第七四象限箝位功率开关[Sc7]构成该多电平变换器的第三基本构成单元；第十四四象限功率开关[S14]、第十五四象限功率开关[S15]和第八四象限箝位功率开关[Sc8]构成该多电平变换器的第四基本构成单元；输出滤波器的输出滤波电容[Cf]、输出交流负载[ZL]的另一端与次级绕组[N2]的中间抽头连接。5. The AC-AC three-level AC-AC converter based on the forward converter according to claim 1, characterized in that: the converter is applied to high-voltage AC-AC conversion occasions of high-frequency electrical isolation Bridge circuit topology, that is, one end of the input high-voltage AC power supply [u i ] is connected to one end of the input filter inductor [L i ], and the other end of the input filter inductor [L i ] is respectively connected to the first input filter capacitor [C 1 ], The second four-quadrant power switch [S 2 ] is connected to one end of the thirteenth four-quadrant power switch [S 13 ]; the other end of the first input filter capacitor [C 1 ] is respectively connected to the second input filter capacitor [C 2 ], the fifth four-quadrant clamp power switch [S c5 ], the sixth four-quadrant clamp power switch [S c6 ], the seventh four-quadrant clamp power switch [S c7 ] and the eighth four-quadrant clamp power switch [ One end of S c8 ] is connected; the input filter inductance [L i ], the first input filter capacitor [C 1 ] and the second input filter capacitor [C 2 ] constitute an input filter for the input high-voltage AC power supply [u i ] filter, and the first input filter capacitor [C 1 ] and the second input filter capacitor [C 2 ] divide the input high-voltage AC power supply [u i ]; the other ends of the second input filter capacitor [C 2 ] are respectively Connect with the other end of the input high-voltage AC power supply [u i ], one end of the fourteenth quadrant power switch [S 10 ] and one end of the fourteenth four-quadrant power switch [S 14 ]; the second four-quadrant power switch [S 2 ] and the other end of the fifth four-quadrant clamp power switch [S c5 ] and one end of the first four-quadrant power switch [S 1 ] are respectively connected, and the other end of the first four-quadrant power switch [S 1 ] One end is respectively connected with one end of the primary winding [N 1 ] of the high-frequency transformer [T] and one end of the eleventh four-quadrant power switch [S 11 ], and the other end of the eleventh four-quadrant power switch [S 11 ] is respectively connected with The other end of the sixth four-quadrant clamp power switch [S c6 ] and the other end of the fourteenth quadrant power switch [S 10 ] are connected; the other end of the thirteenth four-quadrant power switch [S 13 ] is respectively connected to The other end of the seventh four-quadrant clamp power switch [S c7 ] is connected to one end of the twelfth four-quadrant power switch [S 12 ], and the other end of the twelfth four-quadrant power switch [S 12 ] is respectively connected to the primary winding [ The other end of N 1 ] is connected to one end of the fifteenth four-quadrant power switch [S 15 ], and the other end of the fifteenth four-quadrant power switch [S 15 ] is respectively connected to the eighth four-quadrant clamp power switch [S c8 ] The other end of the fourteenth four-quadrant power switch [S 14 ] is connected to the other end; the first four-quadrant power switch [S 1 ], the second four-quadrant power switch [S 2 ], the fifth four-quadrant Clamping power switch [S c5 ], 14th quadrant power switch [S 10 ], 11th quadrant power switch [S 11 ], the sixth four-quadrant clamp power switch [S c6 ], the twelfth four-quadrant power switch [S 12 ], the thirteenth four-quadrant power switch [S 13 ], the seventh four-quadrant clamp power switch [S c7 ], the fourteenth four-quadrant power switch [S 14 ], the fifteenth four-quadrant power switch [S 15 ] and the eighth four-quadrant clamp power switch [S c8 ] together constitute a multilevel converter, wherein The first four-quadrant power switch [S 1 ], the second four-quadrant power switch [S 2 ] and the fifth four-quadrant clamp power switch [S c5 ] constitute the first basic building block of the multilevel converter; the tenth The four-quadrant power switch [S 10 ], the eleventh four-quadrant power switch [S 11 ] and the sixth four-quadrant clamp power switch [S c6 ] constitute the second basic constituent unit of the multilevel converter; the twelfth The four-quadrant power switch [S 12 ], the thirteenth four-quadrant power switch [S 13 ] and the seventh four-quadrant clamp power switch [S c7 ] constitute the third basic building block of the multilevel converter; the fourteenth The four-quadrant power switch [S 14 ], the fifteenth four-quadrant power switch [S 15 ] and the eighth four-quadrant clamp power switch [S c8 ] constitute the fourth basic building block of the multilevel converter; the output filter The output filter capacitor [C f ], the other end of the output AC load [Z L ] is connected to the middle tap of the secondary winding [N 2 ]. 6、根据权利要求1至5任一项所述的基于正激变换器的交—交型三电平交—交变换器，其特征在于：每个四象限功率开关均由两个单个的功率开关反向串联而构成承受正向、反向的电压应力和电流应力的开关。6. The AC-AC three-level AC-AC converter based on the forward converter according to any one of claims 1 to 5, characterized in that: each four-quadrant power switch is composed of two individual power The switches are reversely connected in series to form a switch that bears forward and reverse voltage stress and current stress.
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CN107359803B (en) * 2017-08-31 2019-09-13 南京理工大学 Forward high frequency isolated three-level inverter
CN111464057B (en) * 2020-04-29 2021-08-03 武汉大学 A multi-level single-stage DC/AC converter and its realization method
CN112019062B (en) * 2020-09-11 2021-08-13 南京力骏新能源储能研究院有限公司 Sine wave high-frequency chain three-level lithium battery inverter capable of realizing energy feedback
CN115864874A (en) * 2022-12-13 2023-03-28 阳光电源股份有限公司 Micro inverter and modulation method thereof
CN116191896B (en) * 2023-03-08 2024-04-02 东南大学 Positive and negative bipolar modularized multi-level AC-AC frequency converter

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WO2019147143A1 (en) * 2018-01-25 2019-08-01 Auckland Uniservices Limited A converter
US11791739B2 (en) 2018-01-25 2023-10-17 Auckland Uniservices Limited AC-AC converter

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