CN103036397A - Single-level single-phase large-step-up-ratio cascade connection voltage type convertor of quasi impedance source - Google Patents

Single-level single-phase large-step-up-ratio cascade connection voltage type convertor of quasi impedance source Download PDF

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Publication number
CN103036397A
CN103036397A CN2012105052516A CN201210505251A CN103036397A CN 103036397 A CN103036397 A CN 103036397A CN 2012105052516 A CN2012105052516 A CN 2012105052516A CN 201210505251 A CN201210505251 A CN 201210505251A CN 103036397 A CN103036397 A CN 103036397A
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phase
storage capacitor
impedance network
energy storage
power
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CN103036397B (en
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陈道炼
黄瑞哲
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Fuzhou University
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Fuzhou University
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Abstract

The invention provides a circuit structure of a single-level single-phase large-step-up-ratio cascade connection voltage type convertor of a quasi impedance source. The circuit structure of the single-level single-phase large-step-up-ratio cascade connection voltage type convertor of the quasi impedance source is composed of an input direct-current power source or a single-phase alternating current power source, a large-step-up-ratio impedance network, a high frequency combination modulation switch, a filter, a single-phase alternating current load or a direct-current load, wherein the input direct-current power source or the single-phase alternating current power source, the large-step-up-ratio impedance network, the high frequency combination modulation switch, the filter, the single-phase alternating current load or the direct-current load are connected in a cascading mode in sequence. The large-step-up-ratio impedance network is formed by series connection of an energy storage inductor and n SLCC type two-port impedance network units, wherein the n SLCC type two-port impedance network units are the same and are connected in a cascading mode in sequence. The n is a natural number larger than one. Each SLCC type two-port impedance network unit is composed of a power diode or a four-quadrant power switch, an energy storage inductor and two energy storage capacitors. The high frequency combination modulation switch is composed of a two-quadrant power switch or a four-quadrant power switch. The convertor can effectively convert an unstable low-voltage direct current with a wide changing ranged or a single-phase alternating current into a stable and high-quality single-phase sinusoidal alternating current or direct current in a single-level mode and can be applied to occasions of electrical energy conversion with medium and small capacity.

Description

The accurate source of resistance converter of the large step-up ratio cascade voltage of single-stage and-phase type
Technical field
The accurate source of resistance converter of the large step-up ratio cascade voltage of a kind of single-stage and-phase type involved in the present invention belongs to power electronic technology.
Background technology
Converter is that the applied power semiconductor device is transformed into alternating current or galvanic a kind of static ac dc converter device with direct current or alternating current, for AC load (comprise with AC network and generating electricity by way of merging two or more grid systems) or DC load.
Because fossil energy (non-renewable energy resources) growing tensions such as oil, coal and natural gas, environmental pollution are serious, global warming, nuclear energy production can produce the reasons such as nuke rubbish and contaminated environment, the energy and environment have become the significant problem that the 21 century mankind face.The regenerative resources (green energy resource) such as solar energy, wind energy, Hydrogen Energy, tidal energy and geothermal energy, have cleanliness without any pollution, cheapness, the advantage such as reliable, abundant, its development and utilization more and more is subject to people's attention, and this sustainable development to countries in the world economy has considerable meaning.The direct current energy of the renewable energy conversion such as solar energy, Hydrogen Energy, tidal energy, geothermal energy is normally unsettled, needs to adopt DC-AC converter or DC-DC converter that it is transformed into AC energy or direct current energy supply load use (comprise with AC network and generating electricity by way of merging two or more grid systems); The AC energy of the renewable energy conversion such as wind energy is the alternating current of variable voltage variable frequency normally, needs to adopt the AC-DC converter that it is transformed into direct current energy for load (such as the inverter load); The unstable alternating current that the primary power sources such as alternating current generator produce needs to adopt the AC-AC converter that its AC energy that is transformed into same frequently constant voltage is supplied with AC load and uses.In the conversion occasion take DC generator, storage battery, solar cell, fuel cell, wind energy conversion system, alternating current generator etc. as main direct current, main AC power, inverter, DC converter, rectifier and AC converter are with a wide range of applications.
At present, Small And Medium Capacity DC-AC conversion occasion adopts traditional Single-phase Voltage PWM Inverter circuit structure usually.Must satisfy dc voltage greater than the peak value of AC phase voltage during this class inverter normal operation, therefore there is an obvious defective: when dc voltage (such as the photovoltaic cell fan-out capability) reduces, such as overcast and rainy or night, whole electricity generation system will be difficult to normal operation, and the utilance of system descends.To this, often adopt following two kinds of methods to solve: (1) prime adds Boost type DC converter or high-frequency isolation type DC-DC converter, has increased power conversion progression, circuit complexity, loss and cost; (2) output adds the single phase industrial frequence transformer, has greatly increased volume, weight and the cost of system, is difficult to adapt to today that the copper iron prices of raw and semifnished materials are risen sharply.
At present, Small And Medium Capacity DC-DC, AC-DC, AC-AC conversion occasion also are to adopt traditional pwm converter circuit structure usually, exist equally the brachium pontis power device that the dead band need be set or overlapping time, reliability and output waveform quality are low, inadequate large and cost the is high defectives such as (input or output and add the single phase industrial frequence transformer) of the volume weight of large (non-isolation type), system of step-up ratio.
Therefore, seeking a kind of brachium pontis, need not to establish the accurate source of resistance converter of the large step-up ratio cascade voltage of New single-phase type of Dead Time, high reliability, single-level circuit structure extremely urgent.This must establish not large and cost the is high defectives such as (input or output and add the single phase industrial frequence transformer) of the volume weight of large (non-isolation type), system of Dead Time, step-up ratio for effectively overcoming brachium pontis that conventional P WM converter exists, improve output waveform quality, reliability and the reduction input side EMI of transformation system, widen power electronics converter technique and renewable energy power generation technical know-how, promote the development of generation of electricity by new energy industry and develop energy-savingly all to have great importance with conservation-minded society.
Summary of the invention
The present invention seeks to provide a kind of and have large step-up ratio, single-stage power conversion, power density is high, conversion efficiency is high, the output waveform quality is high, reliability is high, change range of input voltage is wide, cost is low, be applicable to the accurate source of resistance converter of the large step-up ratio cascade voltage of single-stage and-phase type of the characteristics such as Small And Medium Capacity conversion occasion.
Technical scheme 1 of the present invention is: the accurate source of resistance converter of the large step-up ratio cascade voltage of a kind of single-stage and-phase type is to be made of input DC power, large step-up ratio impedance network, single-phase high frequency hybrid modulation switch, single phase filter and sequentially cascade of single phase alternating current (A.C.) load; Described large step-up ratio impedance network is by energy storage inductor L 0The n of sequentially cascade identical SLCC type two port Impedance network element series connection consists of, and wherein n is the natural number greater than 1; Each SLCC type two port Impedance network element is by a power diode S j, an energy storage inductor L j, two storage capacitor C jAnd C j' consist of power diode S jNegative electrode and energy storage inductor L jAn end, storage capacitor C jPositive ends be connected energy storage inductor L jThe other end, power diode S jAnode respectively with storage capacitor C j' positive and negative polarity end be connected storage capacitor C jThe negative polarity end and the negative polarity end of input DC power connect into common port, power diode S jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the input port of j SLCC type two port Impedance network element, energy storage inductor L jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the output port of j SLCC type two port Impedance network element, power diode S 1With storage capacitor C 1' link and the input DC power positive ends between be in series with energy storage inductor L 0, wherein j is the natural number that is not more than n; Described single-phase high frequency hybrid modulation switch is to be made of four two quadrant power switchs that bear unidirectional voltage stress and bidirectional current stress.
Technical scheme 2 of the present invention is: the accurate source of resistance converter of the large step-up ratio cascade voltage of a kind of single-stage and-phase type is to be made of input DC power, large step-up ratio impedance network, high frequency hybrid modulation switch, filter and sequentially cascade of DC load; Described large step-up ratio impedance network is by energy storage inductor L 0The n of sequentially cascade identical SLCC type two port Impedance network element series connection consists of, and wherein n is the natural number greater than 1; Each SLCC type two port Impedance network element is by a power diode S j, an energy storage inductor L j, two storage capacitor C jAnd C j' consist of power diode S jNegative electrode and energy storage inductor L jAn end, storage capacitor C jPositive ends be connected energy storage inductor L jThe other end, power diode S jAnode respectively with storage capacitor C j' positive and negative polarity end be connected storage capacitor C jThe negative polarity end and the negative polarity end of input DC power connect into common port, power diode S jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the input port of j SLCC type two port Impedance network element, energy storage inductor L jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the output port of j SLCC type two port Impedance network element, power diode S 1With storage capacitor C 1' link and the input DC power positive ends between be in series with energy storage inductor L 0, wherein j is the natural number that is not more than n; Described high frequency hybrid modulation switch is to be made of two quadrant power switchs that bear unidirectional voltage stress and bidirectional current stress.
Technical scheme 3 of the present invention is: the accurate source of resistance converter of the large step-up ratio cascade voltage of a kind of single-stage and-phase type is to be made of input single-phase AC power, large step-up ratio impedance network, single-phase high frequency hybrid modulation switch, filter and sequentially cascade of DC load; Described large step-up ratio impedance network is by energy storage inductor L 0The n of sequentially cascade identical SLCC type two port Impedance network element series connection consists of, and wherein n is the natural number greater than 1; Each SLCC type two port Impedance network element is by a four-quadrant power switch S j, an energy storage inductor L j, two storage capacitor C jAnd C j' consist of four-quadrant power switch S jAn end and energy storage inductor L jAn end, storage capacitor C jAn end be connected four-quadrant power switch S jThe other end, energy storage inductor L jThe other end respectively with storage capacitor C j' two ends be connected storage capacitor C jThe other end and the reference negative polarity end of input single-phase AC power connect into common port, four-quadrant power switch S jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the input port of j SLCC type two port Impedance network element, energy storage inductor L jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the output port of j SLCC type two port Impedance network element, four-quadrant power switch S 1With storage capacitor C 1' link and the reference positive ends of input single-phase AC power between be in series with energy storage inductor L 0, wherein j is the natural number that is not more than n; Described single-phase high frequency hybrid modulation switch is to be made of four two quadrant power switchs that bear unidirectional voltage stress and bidirectional current stress.
Technical scheme 4 of the present invention is: the accurate source of resistance converter of the large step-up ratio cascade voltage of a kind of single-stage and-phase type is to be made of input single-phase AC power, large step-up ratio impedance network, single-phase high frequency hybrid modulation switch, single phase filter and sequentially cascade of single phase alternating current (A.C.) load; Described large step-up ratio impedance network is by energy storage inductor L 0The n of sequentially cascade identical SLCC type two port Impedance network element series connection consists of, and wherein n is the natural number greater than 1; Each SLCC type two port Impedance network element is by a four-quadrant power switch S j, an energy storage inductor L j, two storage capacitor C jAnd C j' consist of four-quadrant power switch S jAn end and energy storage inductor L jAn end, storage capacitor C jAn end be connected four-quadrant power switch S jThe other end, energy storage inductor L jThe other end respectively with storage capacitor C j' two ends be connected storage capacitor C jThe other end and the reference negative polarity end of input single-phase AC power connect into common port, four-quadrant power switch S jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the input port of j SLCC type two port Impedance network element, energy storage inductor L jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the output port of j SLCC type two port Impedance network element, four-quadrant power switch S 1With storage capacitor C 1' link and the reference positive ends of input single-phase AC power between be in series with energy storage inductor L 0, wherein j is the natural number that is not more than n; Described single-phase high frequency hybrid modulation switch is to be made of a four-quadrant power switch that bears bi-directional voltage stress and bidirectional current stress.
The present invention is configured to " by large step-up ratio impedance network; the single-level circuit structure that (single-phase) high frequency hybrid modulation switch and the sequentially cascade of (single-phase) filter consist of " with " by (single-phase) high frequency hybrid modulation switch; (single-phase) filter; traditional single stage (single-phase) pwm converter circuit structure or multi-stage cascade pwm converter circuit structure that (single phase industrial frequence transformer) cascade consists of ", the large step-up ratio cascade voltage of single-stage and-phase type accurate source of resistance converter new ideas and circuit structure have been proposed first, i.e. identical SLCC type two port Impedance network element of n by sequentially cascade is provided utilize the output of prime SLCC type two port Impedance network element to improve the step-up ratio of converter as the input of rear class SLCC type two port Impedance network element.By the exponent number n of adjusting SLCC type two port Impedance network element and the duty ratio D that magnetizes of converter energy storage inductor 0=T 0/ T SRealize the adjusting of converter boost ratio, wherein T SBe HF switch cycle time, T 0For (single-phase) high frequency hybrid modulation switch at a T SInterior left brachium pontis or right bridge arm direct pass time (for the DC-AC conversion), ON time (for DC-DC, AC-AC conversion), lower brachium pontis or the upper common ON time of brachium pontis (for the AC-DC conversion).
The invention has the advantages that: the present invention can be transformed into single-phase sinusoidal ac or direct current stable, high-quality with unsettled wide excursion low-voltage DC or single-phase alternating current single-stage, have single-stage power conversion, power density is high, conversion efficiency is high, step-up ratio is large, the output waveform quality is high, reliability is high, low cost and other advantages, is applicable to Small And Medium Capacity DC-AC, DC-DC, AC-DC and AC-AC transformation of electrical energy occasion.
Description of drawings
Fig. 1. the circuit structure of the accurate source of resistance direct-current-alternating-current converter of the large step-up ratio cascade voltage of single-stage and-phase type.
Fig. 2. the principle waveform of the accurate source of resistance direct-current-alternating-current converter of the large step-up ratio cascade voltage of single-stage and-phase type.
Fig. 3. the circuit topology example of the accurate source of resistance direct-current-alternating-current converter of the large step-up ratio cascade voltage of single-stage and-phase type.
Fig. 4. the large step-up ratio cascade voltage of single-stage and-phase type accurate source of resistance direct-current-alternating-current converter energy storage inductor D during bridge arm direct pass 0T SThe equivalent electric circuit that magnetizes.
Fig. 5. the accurate source of resistance direct-current-alternating-current converter of the large step-up ratio cascade voltage of single-stage and-phase type energy storage inductor brachium pontis non-straight-through during (1-D 0) T SAnd the magnetic equivalent electric circuit of dispelling during lower brachium pontis conducting.
Fig. 6. the accurate source of resistance direct-current-alternating-current converter of the large step-up ratio cascade voltage of single-stage and-phase type energy storage inductor brachium pontis non-straight-through during (1-D 0) T SAnd the magnetic equivalent electric circuit of dispelling during the output voltage negative half period.
Fig. 7. the accurate source of resistance direct-current-alternating-current converter of the large step-up ratio cascade voltage of single-stage and-phase type energy storage inductor brachium pontis non-straight-through during (1-D 0) T SAnd the magnetic equivalent electric circuit of dispelling during the positive half cycle of output voltage.
Fig. 8. the accurate source of resistance direct-current-alternating-current converter of the large step-up ratio cascade voltage of single-stage and-phase type energy storage inductor brachium pontis non-straight-through during (1-D 0) T SAnd the magnetic equivalent electric circuit of dispelling during upper brachium pontis conducting.
Fig. 9. the control principle block diagram of the accurate source of resistance direct-current-alternating-current converter of the large step-up ratio cascade voltage of single-stage and-phase type.
Figure 10. the control principle waveform of the accurate source of resistance direct-current-alternating-current converter of the large step-up ratio cascade voltage of single-stage and-phase type.
Figure 11. the circuit structure of the accurate source of resistance DC-DC converter of the large step-up ratio cascade voltage of single-stage and-phase type.
Figure 12. the principle waveform of the accurate source of resistance DC-DC converter of the large step-up ratio cascade voltage of single-stage and-phase type.
Figure 13. the circuit topology example of the accurate source of resistance DC-DC converter of the large step-up ratio cascade voltage of single-stage and-phase type.
Figure 14. the accurate source of resistance DC-DC converter of the large step-up ratio cascade voltage of single-stage and-phase type energy storage inductor D during high frequency hybrid modulation switch conduction 0T SThe equivalent electric circuit that magnetizes.
Figure 15. the accurate source of resistance DC-DC converter of the large step-up ratio cascade voltage of single-stage and-phase type energy storage inductor is at high frequency hybrid modulation switch (1-D between the off period 0) T SThe magnetic equivalent electric circuit of dispelling.
Figure 16. the control principle block diagram of the accurate source of resistance DC-DC converter of the large step-up ratio cascade voltage of single-stage and-phase type.
Figure 17. the control principle waveform of the accurate source of resistance DC-DC converter of the large step-up ratio cascade voltage of single-stage and-phase type.
Figure 18. the circuit structure of the accurate source of resistance A.C.-D.C. converter of the large step-up ratio cascade voltage of single-stage and-phase type.
Figure 19. the principle waveform of the accurate source of resistance A.C.-D.C. converter of the large step-up ratio cascade voltage of single-stage and-phase type.
Figure 20. the circuit topology example of the accurate source of resistance A.C.-D.C. converter of the large step-up ratio cascade voltage of single-stage and-phase type.
Figure 21. the accurate source of resistance A.C.-D.C. converter of the large step-up ratio cascade voltage of single-stage and-phase type energy storage inductor is at lower brachium pontis conduction period D 0T SAnd the equivalent electric circuit that magnetizes during the positive half cycle of input voltage.
Figure 22. the accurate source of resistance A.C.-D.C. converter of the large step-up ratio cascade voltage of single-stage and-phase type energy storage inductor (1-D during the brachium pontis cross-conduction 0) T SAnd the magnetic equivalent electric circuit of dispelling during the positive half cycle of input voltage.
Figure 23. the accurate source of resistance A.C.-D.C. converter of the large step-up ratio cascade voltage of single-stage and-phase type energy storage inductor is at lower brachium pontis conduction period D 0T SAnd the equivalent electric circuit that magnetizes during the input voltage negative half period.
Figure 24. the accurate source of resistance A.C.-D.C. converter of the large step-up ratio cascade voltage of single-stage and-phase type energy storage inductor (1-D during the brachium pontis cross-conduction 0) T SAnd the magnetic equivalent electric circuit of dispelling during the input voltage negative half period.
Figure 25. the control principle block diagram of the accurate source of resistance A.C.-D.C. converter of the large step-up ratio cascade voltage of single-stage and-phase type.
Figure 26. the control principle waveform of the accurate source of resistance A.C.-D.C. converter of the large step-up ratio cascade voltage of single-stage and-phase type.
Figure 27. the circuit structure of the accurate source of resistance ac-to-ac converter of the large step-up ratio cascade voltage of single-stage and-phase type.
Figure 28. the principle waveform of the accurate source of resistance ac-to-ac converter of the large step-up ratio cascade voltage of single-stage and-phase type.
Figure 29. the circuit topology example of the accurate source of resistance ac-to-ac converter of the large step-up ratio cascade voltage of single-stage and-phase type.
Figure 30. the accurate source of resistance ac-to-ac converter of the large step-up ratio cascade voltage of single-stage and-phase type energy storage inductor D during high frequency hybrid modulation switch conduction 0T SAnd the equivalent electric circuit that magnetizes during the positive half cycle of input voltage.
Figure 31. the accurate source of resistance ac-to-ac converter of the large step-up ratio cascade voltage of single-stage and-phase type energy storage inductor is at high frequency hybrid modulation switch (1-D between the off period 0) T SAnd the magnetic equivalent electric circuit of dispelling during the positive half cycle of input voltage.
Figure 32. the accurate source of resistance ac-to-ac converter of the large step-up ratio cascade voltage of single-stage and-phase type energy storage inductor D during high frequency hybrid modulation switch conduction 0T SAnd the equivalent electric circuit that magnetizes during the input voltage negative half period.
Figure 33. the accurate source of resistance ac-to-ac converter of the large step-up ratio cascade voltage of single-stage and-phase type energy storage inductor is at high frequency hybrid modulation switch (1-D between the off period 0) T SAnd the magnetic equivalent electric circuit of dispelling during the input voltage negative half period.
Figure 34. the control principle block diagram of the accurate source of resistance ac-to-ac converter of the large step-up ratio cascade voltage of single-stage and-phase type.
Figure 35. the control principle waveform of the accurate source of resistance ac-to-ac converter of the large step-up ratio cascade voltage of single-stage and-phase type.
Embodiment
Below in conjunction with drawings and Examples technical scheme 1 of the present invention is described further.
The accurate source of resistance direct-current-alternating-current converter of the large step-up ratio cascade voltage of single-stage and-phase type is to be made of input DC power, large step-up ratio impedance network, single-phase high frequency hybrid modulation switch, single phase filter and sequentially cascade of single phase alternating current (A.C.) load; Described large step-up ratio impedance network is by energy storage inductor L 0The n of sequentially cascade identical SLCC type two port Impedance network element series connection consists of, and wherein n is the natural number greater than 1; Each SLCC type two port Impedance network element is by a power diode S j, an energy storage inductor L j, two storage capacitor C jAnd C j' consist of power diode S jNegative electrode and energy storage inductor L jAn end, storage capacitor C jPositive ends be connected energy storage inductor L jThe other end, power diode S jAnode respectively with storage capacitor C j' positive and negative polarity end be connected storage capacitor C jThe negative polarity end and the negative polarity end of input DC power connect into common port, power diode S jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the input port of j SLCC type two port Impedance network element, energy storage inductor L jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the output port of j SLCC type two port Impedance network element, power diode S 1With storage capacitor C 1' link and the input DC power positive ends between be in series with energy storage inductor L 0, wherein j is the natural number that is not more than n; Described single-phase high frequency hybrid modulation switch is to be made of four two quadrant power switchs that bear unidirectional voltage stress and bidirectional current stress.
The large step-up ratio cascade voltage of single-stage and-phase type accurate source of resistance direct-current-alternating-current converter circuit structure and principle waveform, respectively as shown in Figure 1, 2.Among Fig. 1,2, U iBe input direct voltage, Z LBe single-phase output AC load (comprising single phase alternating current (A.C.) passive load and the load of single phase alternating current (A.C.) electrical network), u o, i oBe respectively single-phase output AC voltage and alternating current.Large step-up ratio impedance network is by energy storage inductor L 0The n of sequentially cascade identical SLCC type two port Impedance network element series connection consists of, and wherein n is the natural number greater than 1, and each SLCC type two port Impedance network element is by a power diode S j, an energy storage inductor L j, two storage capacitor C jAnd C j' consist of; Single-phase high frequency hybrid modulation switch, namely half-bridge converter is to be made of four two quadrant power switchs that can bear unidirectional voltage stress and bidirectional current stress; Single phase filter is single-phase LC filter (during the single phase alternating current (A.C.) passive load) or single-phase LCL filter (during the load of single phase alternating current (A.C.) electrical network); Input DC power U iAnd can arrange between the large step-up ratio impedance network or input filter is not set, can reduce the pulsation of input direct-current electric current when input filter is set.When a bridge arm direct pass of single-phase high frequency hybrid modulation switch (half-bridge converter), input DC power U iWith all storage capacitor to energy storage inductor L 0, L 1... L nMagnetize, single-phase output AC load relies on single phase filter to keep power supply; When the conducting of single-phase high frequency hybrid modulation switch (half-bridge converter) brachium pontis switch cross, energy storage inductor L 0, L 1... L nMagnetic and and input DC power U dispel iCommon to all storage capacitors, single phase alternating current (A.C.) load supplying together.Large step-up ratio impedance network and single-phase high frequency hybrid modulation switch (half-bridge converter) are with input direct voltage U iBe modulated into the high frequency pulse dc voltage u that amplitude changes by twice output frequency sinusoidal envelope wire gauge rule 1, single-phase high frequency hybrid modulation switch (half-bridge converter) is with u 1Be reverse into the ternary modulation voltage ripple u that pulsewidth changes by sinusoidal rule 2, after single-phase filtering, obtain high-quality single-phase sinusoidal voltage u at the single phase alternating current (A.C.) passive load oOr at the high-quality single-phase sinusoidal current i of single phase alternating current (A.C.) electrical network load acquisition o
Single-stage and-phase direct-current-alternating-current converter of the present invention, be the single-level circuit structure that the input that utilizes the identical SLCC type two port Impedance network element of the n of sequentially cascade and prime two port Impedance network element to be output as rear class two port Impedance network element improves the converter boost ratio, exist in essence difference with single-stage and-phase voltage type PWM direct-current-alternating-current converter or multi-stage cascade PWM direct-current-alternating-current converter circuit structure.Therefore, single-stage and-phase direct-current-alternating-current converter of the present invention has novelty and creativeness, and has conversion efficiency high (meaning that energy loss is little), power density is high (to mean volume, weight is little), step-up ratio large (meaning that the wider or lower input direct voltage of excursion can be transformed into required single-phase output AC voltage or alternating current), the output waveform distortion factor is low, reliability is high, the input voltage preparation flexibly, cost is low, the advantages such as application prospect is extensive, be a kind of desirable energy-saving and cost-reducing type single-phase DC-AC converter, construction is energy-saving vigorously advocating, have more important value today of conservation-minded society.
The accurate source of resistance direct-current-alternating-current converter of the large step-up ratio cascade voltage of single-stage and-phase type circuit topology embodiment, as shown in Figure 3.What Fig. 3 provided is single-phase LC filter circuit, does not provide as space is limited to be applicable to the single-phase LCL filter circuit higher to the output waveform quality requirement; Single-phase high frequency hybrid modulation switch (half-bridge converter) is selected the MOSFET device, also can select the devices such as IGBT, GTR.Described direct-current-alternating-current converter can be transformed into a kind of unsettled low-voltage DC (such as storage battery, photovoltaic cell, fuel cell, wind energy conversion system etc.) the single-phase sinusoidal ac of required stable, high-quality, high pressure, is widely used in Small And Medium Capacity, the civilian industry Single-Phase Inverter Source of the occasion of boosting (such as communication inverter and photovoltaic combining inverter 24VDC/220V50HzAC, 48VDC/220V50HzAC, 96VDC/220V50HzAC) and national defense industry inverter (such as Aviation Static Inverter 27VDC/115V400HzAC) etc.
Each energy storage inductor of the accurate source of resistance direct-current-alternating-current converter of the large step-up ratio cascade voltage of single-stage and-phase type is a HF switch cycle T SIn magnetize and dispel magnetic each once, D during the corresponding bridge arm direct pass during magnetizing 0T S, and during the magnetic of dispelling corresponding brachium pontis non-straight-through during (1-D 0) T S(comprising during two outer during AC output energy, bridge arm direct pass zero vectors).Described direct-current-alternating-current converter energy storage inductor D during bridge arm direct pass 0T SThe equivalent electric circuit that magnetizes, brachium pontis non-straight-through during (1-D 0) T SAnd the magnetic equivalent electric circuit of dispelling when lower brachium pontis conducting, output voltage negative half period, the positive half cycle of output voltage and upper brachium pontis conducting is respectively shown in Fig. 4,5,6,7,8.Among Fig. 4,5,6,7,8, output voltage u oPolarity be reference direction, and each current polarity is actual direction.
If the storage capacitor terminal voltage is a HF switch cycle T SIn be invariable, use , Expression; The input DC power current i iEnergy storage inductor L namely 0Current i L0By energy storage inductor shown in Figure 4 D during bridge arm direct pass 0T SThe equivalent electric circuit that magnetizes can get,
(1.0)
(1.1) (1.2)
(1.j)
(1.n)
In the formula (1.0)-(1.n), n is the natural number greater than 1, and j is the natural number that is not more than n.By energy storage inductor shown in Fig. 5,6,7,8 brachium pontis non-straight-through during (1-D 0) T SAnd the magnetic equivalent electric circuit of dispelling when lower brachium pontis conducting, output voltage negative half period, the positive half cycle of output voltage and upper brachium pontis conducting can get,
(2.0)
(2.1)
(2.2)
(2.j)
(2.n)
If the voltage magnitude of single-phase high frequency hybrid modulation switch (half-bridge converter) DC side is U 1, can replenish equation
(3.1)
(3.2)
(3.j)
(3.n)
According to State-space Averaging Principle, , order , association type (3), large step-up ratio impedance network storage capacitor magnitude of voltage , For
(4.1)
(4.2)
(4.j)
(4.n)
(5)
The voltage magnitude U of single-phase high frequency hybrid modulation switch (half-bridge converter) DC side 1For
(6)
In the formula (6), (n+1) D 0<1, i.e. D 0<1/(n+1).If the index of modulation of single-phase high frequency hybrid modulation switch (half-bridge converter) is M(0<M≤1-D 0), then the voltage transmission ratio of the accurate source of resistance direct-current-alternating-current converter of the large step-up ratio cascade voltage of single-stage and-phase type is
(7)
By formula (7) as can be known, the voltage transmission of described single-stage and-phase direct-current-alternating-current converter than greater than the voltage transmission of traditional single stage voltage type PWM direct-current-alternating-current converter than M, and at different n, M and D 0During value voltage transmission than exist less than, be equal to and greater than 1 three kinds of situations.As the D of M>1-(n+1) 0The time, for example get n=2 and M>1-3 D 0Can realize that the voltage transmission ratio of described converter is greater than 1, thereby embody the superiority of this converter, particularly can improve the step-up ratio of converter by increasing the n value, therefore be called the accurate source of resistance direct-current-alternating-current converter of the large step-up ratio cascade voltage of single-stage and-phase type.
The accurate source of resistance direct-current-alternating-current converter of the large step-up ratio cascade voltage of single-stage and-phase type only has the single-stage power conversion link, its control system need to realize the control of storage capacitor voltage and the output voltage (grid-connected current) of large step-up ratio impedance network, also needs to realize the MPPT maximum power point tracking control MPPT of photovoltaic cell during supplying power for photovoltaic cell.Therefore, this single-stage and-phase direct-current-alternating-current converter adopts output voltage (grid-connected current) the instantaneous values feedback Unipolar SPWM control strategy with large step-up ratio impedance network storage capacitor voltage feedforward control, shown in Fig. 9,10.Output voltage u o(grid-connected current i o) instantaneous values feedback Unipolar SPWM control strategy is used for regulating the modulation ratio M of transformation system, and large step-up ratio impedance network storage capacitor voltage U CnFeed-forward Control Strategy is used for regulating the straight-through duty ratio D of transformation system 0
Output voltage feedback signal u OfWith reference voltage u rComparison, error obtain signal u after amplifying e(characterizing Sine Modulated than signal M), storage capacitor voltage feedback signal U CnfWith storage capacitor voltage reference signal U CnrComparison, error obtain signal u after amplifying d(characterize straight-through duty cycle signals D 0); u e, u dAnd inversion signal respectively with triangular carrier u cHand over and cut and output single-phase high frequency hybrid modulation switch (half-bridge converter) S behind suitable logical circuit 1', S 3', S 2', S 4' control signal.As input voltage U iDuring variation, by regulating straight-through duty cycle signals D 0Realize the storage capacitor voltage U CnStable; As output loading Z LWhen changing, realize output voltage u by regulating Sine Modulated than signal M oStable.Therefore, to adopt output voltage (grid-connected current) the instantaneous values feedback Unipolar SPWM control strategy with large step-up ratio impedance network storage capacitor voltage feedforward control be practicable for described single-stage and-phase direct-current-alternating-current converter.
Below in conjunction with drawings and Examples technical scheme 2 of the present invention is described further.
The accurate source of resistance DC-DC converter of the large step-up ratio cascade voltage of single-stage and-phase type is to be made of input DC power, large step-up ratio impedance network, high frequency hybrid modulation switch, filter and sequentially cascade of DC load; Described large step-up ratio impedance network is by energy storage inductor L 0The n of sequentially cascade identical SLCC type two port Impedance network element series connection consists of, and wherein n is the natural number greater than 1; Each SLCC type two port Impedance network element is by a power diode S j, an energy storage inductor L j, two storage capacitor C jAnd C j' consist of power diode S jNegative electrode and energy storage inductor L jAn end, storage capacitor C jPositive ends be connected energy storage inductor L jThe other end, power diode S jAnode respectively with storage capacitor C j' positive and negative polarity end be connected storage capacitor C jThe negative polarity end and the negative polarity end of input DC power connect into common port, power diode S jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the input port of j SLCC type two port Impedance network element, energy storage inductor L jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the output port of j SLCC type two port Impedance network element, power diode S 1With storage capacitor C 1' link and the input DC power positive ends between be in series with energy storage inductor L 0, wherein j is the natural number that is not more than n; Described high frequency hybrid modulation switch is to be made of two quadrant power switchs that bear unidirectional voltage stress and bidirectional current stress.
The large step-up ratio cascade voltage of single-stage and-phase type accurate source of resistance DC-DC converter circuit structure and principle waveform are respectively shown in Figure 11,12.Among Figure 11,12, U iBe input direct voltage, Z LBe output DC load, U o, I oBe respectively output dc voltage and direct current.Large step-up ratio impedance network is by energy storage inductor L 0The n of sequentially cascade identical SLCC type two port Impedance network element series connection consists of, and wherein n is the natural number greater than 1, and each SLCC type two port Impedance network element is by a power diode S j, an energy storage inductor L j, two storage capacitor C jAnd C j' consist of; High frequency hybrid modulation switch is to be made of the two quadrant power switchs that can bear unidirectional voltage stress and bidirectional current stress; Output filter is the LC filter; Input DC power U iAnd can arrange between the large step-up ratio impedance network or input filter is not set, can reduce the pulsation of input direct-current electric current when input filter is set.When high frequency hybrid modulation switch conduction, input DC power U iWith all storage capacitor to energy storage inductor L 0, L 1... L nMagnetize, the output DC load relies on output filter to keep power supply; When high frequency hybrid modulation switch ends, energy storage inductor L 0, L 1... L nMagnetic and and input DC power U dispel iTogether jointly to all storage capacitors, the power supply of output DC load.Large step-up ratio impedance network and high frequency hybrid modulation switch are with input direct voltage U iBe modulated into high frequency pulse dc voltage u 1And u 2, after filtering, obtain level and smooth direct voltage U in the output DC load o
Single-stage DC-DC converter of the present invention, be the single-level circuit structure that the input that utilizes the identical SLCC type two port Impedance network element of the n of sequentially cascade and prime two port Impedance network element to be output as rear class two port Impedance network element improves the converter boost ratio, exist in essence difference with traditional single-stage PWM DC-DC converter circuit structure.Therefore, single-stage DC-DC converter of the present invention has novelty and creativeness, and has conversion efficiency high (meaning that energy loss is little), power density is high (to mean volume, weight is little), step-up ratio large (meaning that the wider or lower input direct voltage of excursion can be transformed into needed output dc voltage), output voltage ripple is little, reliability is high, the input voltage preparation flexibly, cost is low, the advantages such as application prospect is extensive, be a kind of desirable energy-saving and cost-reducing type DC-DC converter, construction is energy-saving vigorously advocating, have more important value today of conservation-minded society.
The accurate source of resistance DC-DC converter of the large step-up ratio cascade voltage of single-stage and-phase type circuit topology embodiment, as shown in figure 13.Among Figure 13, what output filter was selected is the LC filter circuit; High frequency hybrid modulation switch S 1 'Select the MOSFET device, also can select the devices such as IGBT, GTR.Described single-stage DC-DC converter can be transformed into a kind of unsettled low-voltage DC (such as storage battery, photovoltaic cell, fuel cell, wind energy conversion system etc.) high voltage direct current of required stable, high-quality, is widely used in Small And Medium Capacity, the civilian industry DC power supply of the occasion of boosting (such as communication DC converter and photovoltaic DC converter 24VDC/220VDC, 48VDC/380VDC, 96VDC/380VDC) and national defense industry DC power supply (such as aviation DC converter 27VDC/270VDC) etc.
Each energy storage inductor of the accurate source of resistance DC-DC converter of the large step-up ratio cascade voltage of single-stage and-phase type is a HF switch cycle T SIn magnetize and dispel magnetic each once, corresponding high frequency hybrid modulation switch S during magnetizing 1 'Conduction period D 0T S, and corresponding high frequency hybrid modulation switch S during the magnetic of dispelling 1 '(1-D between the off period 0) T S(namely to during the outlet side output energy).Described DC-DC converter energy storage inductor is in high frequency hybrid modulation switch S 1 'Conduction period D 0T SMagnetize equivalent electric circuit and (1-D between the off period 0) T SThe magnetic equivalent electric circuit of dispelling, respectively shown in Figure 14,15.
If the storage capacitor terminal voltage is a HF switch cycle T SIn be invariable, use , Expression; The input DC power current i iEnergy storage inductor L namely 0Current i L0By energy storage inductor shown in Figure 14 in high frequency hybrid modulation switch S 1 'Conduction period D 0T SThe equivalent electric circuit that magnetizes can get formula (1.0)-(1.n); By energy storage inductor shown in Figure 15 in high frequency hybrid modulation switch S 1 '(1-D between the off period 0) T SThe magnetic equivalent electric circuit of dispelling can get formula (2.0)-(2.n); If high frequency hybrid modulation switch S 1 '(1-D between the off period 0) T SVoltage magnitude be U 1(U 2), can get supplementary equation (3.1)-(3.n); According to State-space Averaging Principle, , order , association type (3), large step-up ratio impedance network storage capacitor magnitude of voltage , By formula (4.1)-(4.n) and formula (5) expression; High frequency hybrid modulation switch S 1 '(1-D between the off period 0) T SVoltage magnitude U 1(U 2) represented by formula (6).During according to the output inductor stable state weber equilibrium principle, can get
(8)
Namely
(9)
Therefore, the voltage transmission ratio of the accurate source of resistance DC-DC converter of the large step-up ratio cascade voltage of single-stage and-phase type is
(10)
By formula (10) as can be known, the voltage transmission of described single-stage DC-DC converter ratio is at different n, D 0All greater than 1, and compare D greater than the voltage transmission of traditional single stage PWM DC-DC converter during value 0(Buck type), 1/(1-D 0) (Boost type), D 0/ (1-D 0) (Buck-Boost type).Particularly, can improve the step-up ratio of converter by increasing the n value, therefore be called the accurate source of resistance DC-DC converter of the large step-up ratio cascade voltage of single-stage and-phase type.
The accurate source of resistance DC-DC converter of the large step-up ratio cascade voltage of single-stage and-phase type only has the single-stage power conversion link, its control system need to realize the control of output voltage, also needs to realize the MPPT maximum power point tracking control MPPT of photovoltaic cell during supplying power for photovoltaic cell.Therefore, this single-stage DC-DC converter adopts the PWM control strategy of output voltage feedback, shown in Figure 16,17.Output voltage feedback signal U OfWith reference voltage U rComparison, error obtain signal U after amplifying e, U eWith triangular carrier u cHand over and cut rear output high frequency hybrid modulation switch S 1' control signal.As input voltage U iOr load Z LDuring variation, by regulating conducting duty ratio D 0Realize output voltage U oStable.Therefore, the PWM control strategy of described single-stage DC-DC converter employing output voltage feedback is practicable.
Below in conjunction with drawings and Examples technical scheme 3 of the present invention is described further.
The accurate source of resistance A.C.-D.C. converter of the large step-up ratio cascade voltage of single-stage and-phase type is to be made of input single-phase AC power, large step-up ratio impedance network, single-phase high frequency hybrid modulation switch, filter and sequentially cascade of DC load; Described large step-up ratio impedance network is by energy storage inductor L 0The n of sequentially cascade identical SLCC type two port Impedance network element series connection consists of, and wherein n is the natural number greater than 1; Each SLCC type two port Impedance network element is by a four-quadrant power switch S j, an energy storage inductor L j, two storage capacitor C jAnd C j' consist of four-quadrant power switch S jAn end and energy storage inductor L jAn end, storage capacitor C jAn end be connected four-quadrant power switch S jThe other end, energy storage inductor L jThe other end respectively with storage capacitor C j' two ends be connected storage capacitor C jThe other end and the reference negative polarity end of input single-phase AC power connect into common port, four-quadrant power switch S jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the input port of j SLCC type two port Impedance network element, energy storage inductor L jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the output port of j SLCC type two port Impedance network element, four-quadrant power switch S 1With storage capacitor C 1' link and the reference positive ends of input single-phase AC power between be in series with energy storage inductor L 0, wherein j is the natural number that is not more than n; Described single-phase high frequency hybrid modulation switch is to be made of four two quadrant power switchs that bear unidirectional voltage stress and bidirectional current stress.
The large step-up ratio cascade voltage of single-stage and-phase type accurate source of resistance A.C.-D.C. converter circuit structure and principle waveform are respectively shown in Figure 18,19.Among Figure 18,19, u iBe input single-phase alternating voltage, Z LBe output DC load, U o, I oBe respectively output dc voltage and direct current.Large step-up ratio impedance network is by energy storage inductor L 0The n of sequentially cascade identical SLCC type two port Impedance network element series connection consists of, and wherein n is the natural number greater than 1, and each SLCC type two port Impedance network element is by a four-quadrant power switch S j, an energy storage inductor L j, two storage capacitor C jAnd C j' consist of; Single-phase high frequency hybrid modulation switch, namely single-phase rectification bridge is to be made of four two quadrant power switchs that can bear unidirectional voltage stress and bidirectional current stress; Output filter is the LC filter; Input ac power u iAnd can arrange between the large step-up ratio impedance network or input filter is not set, can reduce the harmonic content of input AC electric current when input filter is set.When the lower brachium pontis conducting of single-phase high frequency hybrid modulation switch (single-phase rectification bridge), input ac power u iWith all storage capacitor to energy storage inductor L 0, L 1... L nMagnetize, the output DC load relies on filter to keep power supply; When the conducting of single-phase high frequency hybrid modulation switch (single-phase rectification bridge) brachium pontis switch cross, energy storage inductor L 0, L 1... L nMagnetic and and input ac power u dispel iTogether jointly to all storage capacitors, DC load power supply.Large step-up ratio impedance network and single-phase high frequency hybrid modulation switch (single-phase rectification bridge) are with input ac voltage u iBe modulated into the ternary SPWM ripple u that amplitude changes by sinusoidal rule by the variation of one times of incoming frequency sinusoidal envelope wire gauge rule, pulsewidth 1, single-phase high frequency hybrid modulation switch (single-phase rectification bridge) is with u 1Be rectified into the high frequency pulse dc voltage wave u that amplitude changes by sinusoidal rule by the variation of two times of incoming frequency sinusoidal envelope wire gauge rules, pulsewidth 2, behind output filtering, obtain high-quality direct voltage U in DC load o
Single-stage and-phase A.C.-D.C. converter of the present invention, be the single-level circuit structure that the input that utilizes the identical SLCC type two port Impedance network element of the n of sequentially cascade and prime two port Impedance network element to be output as rear class two port Impedance network element improves the converter boost ratio, exist difference in essence with traditional single-stage and-phase PWM A.C.-D.C. converter (no matter whether adding single-phase input Industrial Frequency Transformer) circuit structure.Therefore, single-stage and-phase A.C.-D.C. converter of the present invention has novelty and creativeness, and has conversion efficiency high (meaning that energy loss is little), power density is high (to mean volume, weight is little), step-up ratio large (meaning that the wider or lower single-phase input ac voltage of excursion can be transformed into required output dc voltage), the input current waveform distortion is little, the output voltage waveforms ripple is little, reliability is high, the input voltage preparation flexibly, cost is low, the advantages such as application prospect is extensive, be a kind of desirable energy-saving and cost-reducing type single phase alternating current (A.C.)-DC converter, construction is energy-saving vigorously advocating, have more important value today of conservation-minded society.
The accurate source of resistance A.C.-D.C. converter of the large step-up ratio cascade voltage of single-stage and-phase type circuit topology embodiment, as shown in figure 20.Among Figure 20, output filter is the LC filter circuit; Single-phase high frequency hybrid modulation switch (single-phase rectification bridge) is selected the MOSFET device, also can select the devices such as IGBT, GTR.Described single-stage and-phase A.C.-D.C. converter can be transformed into a kind of unsettled low-voltage AC (such as wind energy conversion system, ground AC power and aviation AC power etc.) required stable, high-quality, high voltage direct current, is widely used in Small And Medium Capacity, the civilian industry single-phase rectifier power of the occasion of boosting is (such as communication rectifier and wind power generation rectifier 220V50HzAC/380VDC, frequency-changing AC voltage/380VDC) and national defense industry rectifier power source (such as aviation rectifier 115V400HzAC/270VDC) etc.
Each energy storage inductor of the accurate source of resistance A.C.-D.C. converter of the large step-up ratio cascade voltage of single-stage and-phase type is a HF switch cycle T SIn magnetize and dispel magnetic each once, corresponding lower brachium pontis conduction period D during magnetizing 0T S, and (1-D during the corresponding brachium pontis cross-conduction during the magnetic of dispelling 0) T S(during DC side output energy).Described single-stage and-phase A.C.-D.C. converter brachium pontis conduction period D under the energy storage inductor when the positive and negative half cycle of input voltage 0T SThe equivalent electric circuit that magnetizes, brachium pontis cross-conduction during (1-D 0) T SThe magnetic equivalent electric circuit of dispelling, respectively shown in Figure 21,22,23,24.Among Figure 21,22,23,24, input voltage u iPolarity be reference direction, and each current polarity is actual direction.
If the storage capacitor terminal voltage is a HF switch cycle T SIn be invariable, use , Expression; The input DC power current i iEnergy storage inductor L namely 0Current i L0By energy storage inductor shown in Figure 21,23 in high frequency hybrid modulation switch S 3 ', S 4 ', S 1 '(S 2 ') conduction period D 0T SThe equivalent electric circuit that magnetizes can get formula (1.0)-(1.n); By energy storage inductor shown in Figure 22,24 in high frequency hybrid modulation switch S 1 ', S 4 '(S 2 ', S 3 ') conduction period (1-D 0) T SThe magnetic equivalent electric circuit of dispelling can get formula (2.0)-(2.n); If high frequency hybrid modulation switch S 1 ', S 4 '(S 2 ', S 3 ') conduction period (1-D 0) T SVoltage magnitude be U 1, can get supplementary equation (3.1)-(3.n); According to State-space Averaging Principle, , order , association type (3), large step-up ratio impedance network storage capacitor magnitude of voltage , By formula (4.1)-(4.n) and formula (5) expression; The voltage magnitude U of high frequency hybrid modulation switch (single-phase rectification bridge) AC 1Voltage magnitude U with DC side 2Represented by formula (6).During according to the output inductor stable state weber equilibrium principle, can get
(11)
Namely
(12)
Therefore, the voltage transmission ratio of the accurate source of resistance A.C.-D.C. converter of the large step-up ratio cascade voltage of single-stage and-phase type is
(13)
By formula (13) as can be known, the voltage transmission of described single-stage and-phase A.C.-D.C. converter ratio is at different n, D 0All greater than 1, and compare D greater than the voltage transmission of traditional single stage PWM A.C.-D.C. converter during value 0(Buck type), 1/(1-D 0) (Boost type).Particularly, can improve the step-up ratio of converter by increasing the n value, therefore be called the accurate source of resistance A.C.-D.C. converter of the large step-up ratio cascade voltage of single-stage and-phase type.
The accurate source of resistance A.C.-D.C. converter of the large step-up ratio cascade voltage of single-stage and-phase type only has the single-stage power conversion link, its control system need to realize the storage capacitor voltage of large step-up ratio impedance network and the control of output dc voltage, also needs to realize the MPPT maximum power point tracking control MPPT of wind energy conversion system during wind power generation.Therefore, this single-stage and-phase A.C.-D.C. converter adopts the dicyclo SPWM control strategy of output dc voltage outer shroud, large step-up ratio impedance network storage capacitor voltage inter-loop control, shown in Figure 25,26.
Output voltage feedback signal U OfWith reference voltage U rSignal after comparison, error are amplified is as the reference signal U of interior ring Cnr, storage capacitor voltage feedback signal U CnfBehind absolute value circuit with reference signal U CnrComparison, error amplification obtain signal u e, u eWith triangular carrier u cThe signal that friendship intercepts and input voltage polarity selection signal be output single-phase high frequency hybrid modulation switch (single-phase rectification bridge) S behind suitable logical circuit 1', S 3', S 2', S 4' and the four-quadrant power switch S of large step-up ratio impedance network 1, S 2..., S nControl signal.As input voltage u iOr output loading Z LDuring variation, by regulating duty cycle signals D 0Realize output voltage U oStable.Therefore, the dicyclo SPWM control strategy of described single-stage and-phase A.C.-D.C. converter employing output dc voltage outer shroud, large step-up ratio impedance network storage capacitor voltage inter-loop control is practicable.
Below in conjunction with drawings and Examples technical scheme 4 of the present invention is described further.
The accurate source of resistance ac-to-ac converter of the large step-up ratio cascade voltage of single-stage and-phase type is to be made of input single-phase AC power, large step-up ratio impedance network, single-phase high frequency hybrid modulation switch, single phase filter and sequentially cascade of single phase alternating current (A.C.) load; Described large step-up ratio impedance network is by energy storage inductor L 0The n of sequentially cascade identical SLCC type two port Impedance network element series connection consists of, and wherein n is the natural number greater than 1; Each SLCC type two port Impedance network element is by a four-quadrant power switch S j, an energy storage inductor L j, two storage capacitor C jAnd C j' consist of four-quadrant power switch S jAn end and energy storage inductor L jAn end, storage capacitor C jAn end be connected four-quadrant power switch S jThe other end, energy storage inductor L jThe other end respectively with storage capacitor C j' two ends be connected storage capacitor C jThe other end and the reference negative polarity end of input single-phase AC power connect into common port, four-quadrant power switch S jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the input port of j SLCC type two port Impedance network element, energy storage inductor L jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the output port of j SLCC type two port Impedance network element, four-quadrant power switch S 1With storage capacitor C 1' link and the reference positive ends of input single-phase AC power between be in series with energy storage inductor L 0, wherein j is the natural number that is not more than n; Described single-phase high frequency hybrid modulation switch is to be made of a four-quadrant power switch that bears bi-directional voltage stress and bidirectional current stress.
The large step-up ratio cascade voltage of single-stage and-phase type accurate source of resistance ac-to-ac converter circuit structure and principle waveform are respectively shown in Figure 27,28.Among Figure 27,28, u iBe input single-phase alternating voltage, Z LBe single-phase output AC load (comprising single phase alternating current (A.C.) passive load and the load of single phase alternating current (A.C.) electrical network), u o, i oBe respectively single-phase output AC voltage and alternating current.Large step-up ratio impedance network is by energy storage inductor L 0The n of sequentially cascade identical SLCC type two port Impedance network element series connection consists of, and wherein n is the natural number greater than 1, and each SLCC type two port Impedance network element is by a four-quadrant power switch S j, an energy storage inductor L j, two storage capacitor C jAnd C j' consist of; Single-phase high frequency hybrid modulation switch is to be made of a four-quadrant power switch that can bear bi-directional voltage stress and bidirectional current stress; Single phase filter is single-phase LC filter (during the single phase alternating current (A.C.) passive load) or single-phase LCL filter (during the load of single phase alternating current (A.C.) electrical network); Input ac power u iAnd can arrange between the large step-up ratio impedance network or input filter is not set, can reduce the harmonic content of input AC electric current when input filter is set.When single-phase high frequency hybrid modulation switch conduction, input ac power u iWith all storage capacitor to energy storage inductor L 0, L 1... L nMagnetize, the output AC load relies on filter to keep power supply; When single-phase high frequency hybrid modulation switch ends, energy storage inductor L 0, L 1... L nMagnetic and and input ac power u dispel iTogether jointly to all storage capacitors, AC load power supply.Large step-up ratio impedance network and single-phase high frequency hybrid modulation switch are with input ac voltage u iBe modulated into amplitude by the variation of one times of incoming frequency sinusoidal envelope wire gauge rule, the essentially identical ternary SPWM ripple u of pulsewidth 1(u 2), behind output filtering, obtain high-quality sinusoidal voltage u in AC load o
Single-stage and-phase ac-to-ac converter of the present invention, be the single-level circuit structure that the input that utilizes the identical SLCC type two port Impedance network element of the n of sequentially cascade and prime two port Impedance network element to be output as rear class two port Impedance network element improves the converter boost ratio, exist difference in essence with traditional single-stage and-phase PWM ac-to-ac converter (no matter whether adding the single-phase Industrial Frequency Transformer that inputs or outputs) circuit structure.Therefore, single-stage and-phase ac-to-ac converter of the present invention has novelty and creativeness, and has conversion efficiency high (meaning that energy loss is little), power density is high (to mean volume, weight is little), step-up ratio large (meaning that the wider or lower single-phase input ac voltage of excursion can be transformed into needed single-phase output AC voltage), net side power factor is high, output voltage THD is little, reliability is high, the input voltage preparation flexibly, cost is low, the advantages such as application prospect is extensive, be a kind of desirable energy-saving and cost-reducing type single phase alternating current (A.C.)-AC converter, construction is energy-saving vigorously advocating, have more important value today of conservation-minded society.
The accurate source of resistance ac-to-ac converter of the large step-up ratio cascade voltage of single-stage and-phase type circuit topology embodiment, as shown in figure 29.What Figure 29 provided is single-phase LC filter circuit, does not provide as space is limited to be applicable to the single-phase LCL filter circuit higher to the output waveform quality requirement; Single-phase high frequency hybrid modulation switch is selected the MOSFET device, also can select the devices such as IGBT, GTR.Described ac-to-ac converter can be transformed into a kind of unsettled single-phase low-voltage AC (such as wind energy conversion system, ground AC power and aviation AC power etc.) required stable, high-quality, high-voltage one-phase alternating current, is widely used in Small And Medium Capacity, the civilian industry single phase alternating current (A.C.) voltage stabilizing of the occasion of boosting and variable-voltage power supply (such as electronic transformer 110V50HzAC/220V50HzAC) and national defense industry AC voltage-stabilizing and variable-voltage power supply (such as aviation electronics transformer 36V400HzAC/115V400HzAC) etc.
Each energy storage inductor of the accurate source of resistance ac-to-ac converter of the large step-up ratio cascade voltage of single-stage and-phase type is a HF switch cycle T SIn magnetize and dispel magnetic each once, D during the corresponding single-phase high frequency hybrid modulation switch conduction during magnetizing 0T S, and corresponding single-phase high frequency hybrid modulation switch (1-D between the off period during the magnetic of dispelling 0) T S(during load-side output energy).Described ac-to-ac converter is energy storage inductor D during single-phase high frequency hybrid modulation switch conduction in the positive and negative half cycle situation of input (output) voltage 0T SThe equivalent electric circuit that magnetizes, (1-D between the off period 0) T SThe magnetic equivalent electric circuit of dispelling, respectively shown in Figure 30,31,32,33.Among Figure 30,31,32,33, input voltage u iPolarity be reference direction, and each current polarity is actual direction.
If the storage capacitor terminal voltage is a HF switch cycle T SIn be invariable, use , Expression; The input DC power current i iEnergy storage inductor L namely 0Current i L0By energy storage inductor shown in Figure 30,32 in single-phase high frequency hybrid modulation switch S 1 'Conduction period D 0T SThe equivalent electric circuit that magnetizes can get formula (1.0)-(1.n); By energy storage inductor shown in Figure 31,33 in single-phase high frequency hybrid modulation switch S 1 '(1-D between the off period 0) T SThe magnetic equivalent electric circuit of dispelling can get formula (2.0)-(2.n); If single-phase high frequency hybrid modulation switch S 1 '(1-D between the off period 0) T SVoltage magnitude be U 1(U 2), can get supplementary equation (3.1)-(3.n); According to State-space Averaging Principle, , order , association type (3), large step-up ratio impedance network storage capacitor magnitude of voltage , By formula (4.1)-(4.n) and formula (5) expression; Single-phase high frequency hybrid modulation switch S 1 'Voltage magnitude U during cut-off 1(U 2) represented by formula (6).During according to the output inductor stable state weber equilibrium principle, can get
(14)
Namely
(15)
Therefore, the voltage transmission ratio of the accurate source of resistance ac-to-ac converter of the large step-up ratio cascade voltage of single-stage and-phase type is
(16)
By formula (16) as can be known, the voltage transmission of described single-stage and-phase ac-to-ac converter ratio is at different n, D 0All greater than 1, and compare D greater than the voltage transmission of traditional single stage PWM ac-to-ac converter during value 0(Buck type), 1/(1-D 0) (Boost type), D 0/ (1-D 0) (Buck-Boost type).Particularly, can improve the step-up ratio of converter by increasing the n value, therefore be called the accurate source of resistance ac-to-ac converter of the large step-up ratio cascade voltage of single-stage and-phase type.
The accurate source of resistance ac-to-ac converter of the large step-up ratio cascade voltage of single-stage and-phase type only has the single-stage power conversion link, and its control system need to realize the control of output AC voltage, also needs to realize the MPPT maximum power point tracking control MPPT of wind energy conversion system during wind power generation.Therefore, this single-stage and-phase ac-to-ac converter adopts output AC voltage instantaneous values feedback PWM control strategy, shown in Figure 34,35.
Output voltage feedback signal u OfWith reference voltage u rComparison, error obtain signal u after amplifying, taking absolute value e, u eWith triangular carrier u cThe signal that friendship intercepts and inversion signal thereof are respectively as single-phase high frequency hybrid modulation switch S 1' and the four-quadrant power switch S of large step-up ratio impedance network 1, S 2..., S nControl signal.As input voltage u iOr output loading Z LDuring variation, by regulating duty cycle signals D 0Realize output voltage u oStable.Therefore, described single-stage and-phase ac-to-ac converter employing output AC voltage instantaneous values feedback PWM control strategy is practicable.

Claims (4)

1. accurate source of resistance converter of the large step-up ratio cascade voltage of single-stage and-phase type is characterized in that: this converter circuit structure is to be made of input DC power, large step-up ratio impedance network, single-phase high frequency hybrid modulation switch, single phase filter and sequentially cascade of single phase alternating current (A.C.) load; Described large step-up ratio impedance network is by energy storage inductor L 0The n of sequentially cascade identical SLCC type two port Impedance network element series connection consists of, and wherein n is the natural number greater than 1; Each SLCC type two port Impedance network element is by a power diode S j, an energy storage inductor L j, two storage capacitor C jAnd C j' consist of power diode S jNegative electrode and energy storage inductor L jAn end, storage capacitor C jPositive ends be connected energy storage inductor L jThe other end, power diode S jAnode respectively with storage capacitor C j' positive and negative polarity end be connected storage capacitor C jThe negative polarity end and the negative polarity end of input DC power connect into common port, power diode S jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the input port of j SLCC type two port Impedance network element, energy storage inductor L jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the output port of j SLCC type two port Impedance network element, power diode S 1With storage capacitor C 1' link and the input DC power positive ends between be in series with energy storage inductor L 0, wherein j is the natural number that is not more than n; Described single-phase high frequency hybrid modulation switch is to be made of four two quadrant power switchs that bear unidirectional voltage stress and bidirectional current stress.
2. accurate source of resistance converter of the large step-up ratio cascade voltage of single-stage and-phase type is characterized in that: this converter circuit structure is to be made of input DC power, large step-up ratio impedance network, high frequency hybrid modulation switch, filter and sequentially cascade of DC load; Described large step-up ratio impedance network is by energy storage inductor L 0The n of sequentially cascade identical SLCC type two port Impedance network element series connection consists of, and wherein n is the natural number greater than 1; Each SLCC type two port Impedance network element is by a power diode S j, an energy storage inductor L j, two storage capacitor C jAnd C j' consist of power diode S jNegative electrode and energy storage inductor L jAn end, storage capacitor C jPositive ends be connected energy storage inductor L jThe other end, power diode S jAnode respectively with storage capacitor C j' positive and negative polarity end be connected storage capacitor C jThe negative polarity end and the negative polarity end of input DC power connect into common port, power diode S jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the input port of j SLCC type two port Impedance network element, energy storage inductor L jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the output port of j SLCC type two port Impedance network element, power diode S 1With storage capacitor C 1' link and the input DC power positive ends between be in series with energy storage inductor L 0, wherein j is the natural number that is not more than n; Described high frequency hybrid modulation switch is to be made of two quadrant power switchs that bear unidirectional voltage stress and bidirectional current stress.
3. accurate source of resistance converter of the large step-up ratio cascade voltage of single-stage and-phase type is characterized in that: this converter circuit structure is to be made of input single-phase AC power, large step-up ratio impedance network, single-phase high frequency hybrid modulation switch, filter and sequentially cascade of DC load; Described large step-up ratio impedance network is by energy storage inductor L 0The n of sequentially cascade identical SLCC type two port Impedance network element series connection consists of, and wherein n is the natural number greater than 1; Each SLCC type two port Impedance network element is by a four-quadrant power switch S j, an energy storage inductor L j, two storage capacitor C jAnd C j' consist of four-quadrant power switch S jAn end and energy storage inductor L jAn end, storage capacitor C jAn end be connected four-quadrant power switch S jThe other end, energy storage inductor L jThe other end respectively with storage capacitor C j' two ends be connected storage capacitor C jThe other end and the reference negative polarity end of input single-phase AC power connect into common port, four-quadrant power switch S jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the input port of j SLCC type two port Impedance network element, energy storage inductor L jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the output port of j SLCC type two port Impedance network element, four-quadrant power switch S 1With storage capacitor C 1' link and the reference positive ends of input single-phase AC power between be in series with energy storage inductor L 0, wherein j is the natural number that is not more than n; Described single-phase high frequency hybrid modulation switch is to be made of four two quadrant power switchs that bear unidirectional voltage stress and bidirectional current stress.
4. accurate source of resistance converter of the large step-up ratio cascade voltage of single-stage and-phase type is characterized in that: this converter circuit structure is to be made of input single-phase AC power, large step-up ratio impedance network, single-phase high frequency hybrid modulation switch, single phase filter and sequentially cascade of single phase alternating current (A.C.) load; Described large step-up ratio impedance network is by energy storage inductor L 0The n of sequentially cascade identical SLCC type two port Impedance network element series connection consists of, and wherein n is the natural number greater than 1; Each SLCC type two port Impedance network element is by a four-quadrant power switch S j, an energy storage inductor L j, two storage capacitor C jAnd C j' consist of four-quadrant power switch S jAn end and energy storage inductor L jAn end, storage capacitor C jAn end be connected four-quadrant power switch S jThe other end, energy storage inductor L jThe other end respectively with storage capacitor C j' two ends be connected storage capacitor C jThe other end and the reference negative polarity end of input single-phase AC power connect into common port, four-quadrant power switch S jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the input port of j SLCC type two port Impedance network element, energy storage inductor L jWith storage capacitor C j' link and storage capacitor C jCommon port consisted of the output port of j SLCC type two port Impedance network element, four-quadrant power switch S 1With storage capacitor C 1' link and the reference positive ends of input single-phase AC power between be in series with energy storage inductor L 0, wherein j is the natural number that is not more than n; Described single-phase high frequency hybrid modulation switch is to be made of a four-quadrant power switch that bears bi-directional voltage stress and bidirectional current stress.
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