CN103259442A - High-gain current type inverter - Google Patents
High-gain current type inverter Download PDFInfo
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- CN103259442A CN103259442A CN2013101966679A CN201310196667A CN103259442A CN 103259442 A CN103259442 A CN 103259442A CN 2013101966679 A CN2013101966679 A CN 2013101966679A CN 201310196667 A CN201310196667 A CN 201310196667A CN 103259442 A CN103259442 A CN 103259442A
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Abstract
The invention discloses a high-gain current type inverter which is characterized in that a switching inductance network is composed of a diode D1, an inductance L1, an inductance L2, a diode D2, a diode D3 and a power switch tube T7, a three-phase current type inverter bridge is composed by power switch tubes of an upper bridge arm and power switch tubes of a lower bridge arm, the power switch tubes of the upper bridge arm include a power switch tube T1, a power switch tubeT3 and a power switch tube T5, the power switch tubes of the lower bridge arm include a power switch tube of T4, a power switch tube T6 and a power switch tube T2, three filter capacitor Cfs which are of a 'Y' shape are connected to form a capacitor filter which is arranged at the output end of the three-phase inverter bridge so as to form a three-phase filtering output, and a three-phase power grid or a three-phase alternating current load is connected with the three-phase filtering output through a filter inductance Lf. The high-gain current type inverter has the advantages that the direct current input voltage range of the inverter can be effectively widened, an electrolytic capacitor on the direct-current side is not needed, reliability can be improved, the system structure is simple, cost can be reduced and efficiency can be improved.
Description
Technical field
The present invention relates to a kind of high-gain current type inverter, be applicable to electric power supply system of fuel cell, wind generator system and parallel network power generation field.
Background technology
Often voltage is low, unstable for the direct current that regenerative resources such as solar energy, tidal energy, geothermal energy produce, and need supply with AC load or electrical network by the power electronic equipment inversion of boosting.Inverter is the important component part of power electronic equipment, and generating electricity by way of merging two or more grid systems at new forms of energy today of developing rapidly has very important meaning to the research of inversion transformation technique.
Power inverting technology of the prior art is mainly based on two kinds of traditional inverter topologies: voltage-source type and current source inverter.But voltage-source type and current source inverter have certain limitation, have limited its application in some occasions.The Z source inventer that proposes also is used widely in various occasions in the recent period, the advantage that it has conventional inverter not have, but its weak point is also arranged.
1, voltage source inverter is a kind of voltage-dropping type inverter, ac output voltage can only be lower than DC bus-bar voltage, for some input dc powers force down, unsettled occasion, as fuel cell, photovoltaic generation, wind power generation occasion, need increase DC-DC in prime boosts, increase complexity and the cost of system like this, reduced efficient and the reliability of system simultaneously.Can also be by boosting and be incorporated into the power networks exchanging the side joint Industrial Frequency Transformer, but the Industrial Frequency Transformer volume is big, price is high, heavy, also reduced efficient.The upper and lower bridge arm of the same phase of inverter can not lead directly to, otherwise can damage inverter.Yet because the false triggering that electromagnetic interference causes causes straight-through happening occasionally, need usually to add the dead band, but can cause the distortion of output waveform in the reality.The electrochemical capacitor temperature influence of voltage source inverter DC side is bigger, and its low reliability has reduced the life-span of inverter.
2, current source inverter is the booster type inverter, but its boost capability is limited, and the inductance of DC side is generally also bigger, has increased cost.During for generations of electricity by new energy such as photovoltaics, input and output power is difficult to realize decoupling zero control.The inverter brachium pontis can not be opened a way, otherwise can damage inverter, need add the overlapping conducting time between two switching tubes up and down at same brachium pontis usually, can cause distortion equally.
3, the Z source inventer has the buck function, and bridge arm direct pass is its a kind of normal operating conditions.But owing to increased an inductance capacitance Z source network, under certain condition, resonance may take place in inductance capacitance, influences the circuit operate as normal.Impulse current is big during startup, might damage inverter.Two electric capacity requirements are in full accord, and electric capacity is inconsistent will to damage inverter.
Summary of the invention
The present invention is for fear of above-mentioned existing in prior technology weak point, has proposed a kind of high-gain current type inverter.In the hope of improving inverter DC input voitage scope, DC side does not need electrochemical capacitor simultaneously, has improved reliability, and system configuration is simple, has reduced cost, has improved efficient.
Technical solution problem of the present invention adopts following technical scheme:
The design feature of high-gain current type inverter of the present invention is:
Form the switched inductors network by diode D1, inductance L 1, inductance L 2, diode D2, diode D3 and power switch pipe T7; The anode of the negative electrode of the positive terminal of DC power supply Vdc and power switch pipe T7, diode D1, and an end of inductance L 2 connects jointly; The negative electrode of the collector electrode of power switch pipe T7 and diode D2, and an end of inductance L 1 connects jointly; The other end of the negative electrode of diode D1 and inductance L 1, and the negative electrode of diode D3 connects jointly; The anode of the other end of inductance L 2 and diode D2, and the anode of diode D3 connects jointly;
Form three-phase electricity flow pattern inverter bridge jointly by last brachium pontis each power switch pipe T1, T3, T5 and following brachium pontis each power switch pipe T4, T6 and T2, the negative electrode of the negative pole end of DC power supply Vdc and described power switch pipe T4, T6 and T2 is connected to tie point n jointly, and the collector electrode of described power switch pipe T1, T3 and T5 and the collector electrode of power switch pipe T7 are connected to tie point c jointly; Output setting at described three phase inverter bridge is the capacitive filter that " Y " shape connects and composes by three filter capacitor Cf, forms three-phase filtering output; Three phase network or three-phase alternating current load are connected with described three-phase filtering output by filter inductance Lf.
The design feature of high-gain current type inverter of the present invention also is:
Described power switch pipe T7, T1, T3, T5, T4, T6 and T2 are made up of the insulated gate bipolar transistor IGBT series diode, the emitter of described insulated gate bipolar transistor IGBT links to each other with the anode of diode, the collector electrode of the very described power switch pipe of the current collection of insulated gate bipolar transistor IGBT, the negative electrode of diode are the negative electrode of described power switch pipe;
Or described power switch pipe T7, T1, T3, T5, T4, T6 and T2 are made up of field of electric force effect transistor MOSFET series diode, the source electrode of described field of electric force effect transistor MOSFET links to each other with the anode of diode, the drain electrode of field of electric force effect transistor MOSFET is the collector electrode of described power switch pipe, and the negative electrode of diode is the negative electrode of described power switch pipe;
Or described power switch pipe T7, T1, T3, T5, T4, T6 and T2 are single reverse blocking transistor npn npn RB-IGBT, the collector electrode of the very described power switch pipe of current collection of reverse blocking transistor npn npn RB-IGBT, the negative electrode of the very described power switch pipe of emission of reverse blocking transistor npn npn RB-IGBT.
The design feature of high-gain current type inverter of the present invention also is: described high-gain current type inverter has three kinds of operating states: be respectively:
Pass-through state: the last brachium pontis of same phase and the conducting simultaneously of following brachium pontis power switch pipe in the described three-phase electricity flow pattern inverter bridge, described three-phase electricity flow pattern inverter bridge is in pass-through state;
The afterflow state: three power switch pipe conductings simultaneously on the last brachium pontis of described three-phase electricity flow pattern inverter bridge or the following brachium pontis, described power switch pipe T7 conducting, described three-phase electricity flow pattern inverter bridge is in the afterflow state;
Active state: two out of phase upward brachium pontis and the conductings of following brachium pontis power switch pipe in the described three-phase electricity flow pattern inverter bridge, described three-phase electricity flow pattern inverter bridge is active state.
When described three-phase electricity flow pattern inverter bridge is pass-through state, described diode D1 and the equal conducting of diode D2, described diode D3 ends; When described three-phase electricity flow pattern inverter bridge is the afterflow state, described diode D1 and the equal conducting of diode D2, described diode D3 ends; When described three-phase electricity flow pattern inverter bridge was active state, described diode D1 and diode D2 all ended, described diode D3 conducting.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, the present invention is a kind of novel inverter of high-gain, during for grid-connected power generation system such as photovoltaics, does not need the DC-DC level, has reduced device count, has reduced cost, has improved efficient.Because voltage gain is higher, needed photovoltaic module number is few, has reduced like this because the power loss that partial occlusion and photovoltaic module do not match and cause.
2, the present invention does not have the relatively poor electrochemical capacitor of dependability, because the electrochemical capacitor temperature influence is very big, it is a key factor that influences the inverter life-span, and therefore the life-span of inverter of the present invention is long.
3, the present invention can be operated under straight-through and the open-circuit condition, do not need as traditional voltage source inverter, in the brachium pontis switching signal, to add the dead band, do not need as traditional current source inverter, in the brachium pontis switching signal, to add the superimposed flow time yet, control simpler, the output waveform better quality.Owing to introduced the afterflow state, inverter can be realized the decoupling zero control of input and output power.
4, the present invention can be widely used in various generations of electricity by new energy, because cost is lower, the efficient height has high cost performance, helps to promote the development of new forms of energy.Along with the appearance of new devices such as reverse IGBT capable of blocking, this inverter no longer needs series diode, has solved the loss problem of series diode, and its advantage will be more obvious.
Description of drawings
Fig. 1 is the main circuit schematic diagram of high-gain current type inverter of the present invention;
Fig. 2 a, Fig. 2 b and Fig. 2 c are the multi-form schematic diagram of power switch pipe of high-gain current type inverter among the present invention;
Fig. 3 a is that high-gain current type inverter of the present invention is the pass-through state schematic diagram;
Fig. 3 b is that high-gain current type inverter of the present invention is the afterflow view;
Fig. 3 c is that high-gain current type inverter of the present invention is active view;
Fig. 4 a, Fig. 4 b, Fig. 4 c and Fig. 4 d are respectively the implementation result schematic diagram of high-gain current type inverter of the present invention.
Embodiment:
As shown in Figure 1, the version of high-gain current type inverter is in the present embodiment, forms the switched inductors network by diode D1, inductance L 1, inductance L 2, diode D2, diode D3 and power switch pipe T7; The anode of the negative electrode of the positive terminal of DC power supply Vdc and power switch pipe T7, diode D1, and an end of inductance L 2 connects jointly; The negative electrode of the collector electrode of power switch pipe T7 and diode D2, and an end of inductance L 1 connects jointly; The other end of the negative electrode of diode D1 and inductance L 1, and the negative electrode of diode D3 connects jointly; The anode of the other end of inductance L 2 and diode D2, and the anode of diode D3 connects jointly;
Form three-phase electricity flow pattern inverter bridge jointly by last brachium pontis each power switch pipe T1, T3, T5 and following brachium pontis each power switch pipe T4, T6 and T2, the negative electrode of the negative pole end of DC power supply Vdc and power switch pipe T4, T6 and T2 is connected to tie point n jointly, and the collector electrode of the collector electrode of power switch pipe T1, T3 and T5 and power switch pipe T7 is connected to tie point c jointly; Output setting at three phase inverter bridge is the capacitive filter that " Y " shape connects and composes by three filter capacitor Cf, forms three-phase filtering output; Three phase network or three-phase alternating current load are connected with three-phase filtering output by filter inductance Lf.
Shown in Fig. 2 a, power switch pipe T7, T1, T3, T5, T4, T6 and T2 can be made up of the insulated gate bipolar transistor IGBT series diode in the present embodiment, the emitter of insulated gate bipolar transistor IGBT links to each other with the anode of diode, the current collection of insulated gate bipolar transistor IGBT is the collector electrode of power switch pipe very, and the negative electrode of diode is the negative electrode of power switch pipe; Or shown in Fig. 2 b, power switch pipe T7, T1, T3, T5, T4, T6 and T2 are made up of field of electric force effect transistor MOSFET series diode, the source electrode of field of electric force effect transistor MOSFET links to each other with the anode of diode, the drain electrode of field of electric force effect transistor MOSFET is the collector electrode of power switch pipe, and the negative electrode of diode is the negative electrode of power switch pipe; Or shown in Fig. 2 c, power switch pipe T7, T1, T3, T5, T4, T6 and T2 are single reverse blocking transistor npn npn RB-IGBT, the current collection of reverse blocking transistor npn npn RB-IGBT is the collector electrode of power switch pipe very, and the emission of reverse blocking transistor npn npn RB-IGBT is the negative electrode of power switch pipe very.
High-gain current type inverter has three kinds of operating states in the present embodiment: be respectively:
Pass-through state shown in Fig. 3 a: the last brachium pontis of same phase and the conducting simultaneously of following brachium pontis power switch pipe in the three-phase electricity flow pattern inverter bridge, three-phase electricity flow pattern inverter bridge is in pass-through state.
Afterflow state shown in Fig. 3 b: three power switch pipe conductings simultaneously on the last brachium pontis of three-phase electricity flow pattern inverter bridge or the following brachium pontis, power switch pipe T7 conducting, three-phase electricity flow pattern inverter bridge is in the afterflow state.
Active state shown in Fig. 3 c: two out of phase upward brachium pontis and the conductings of following brachium pontis power switch pipe in the three-phase electricity flow pattern inverter bridge, three-phase electricity flow pattern inverter bridge is active state.
When a phase bridge arm direct pass of inverter, diode D1 and diode D2 all are in conducting state, and inverter bridge direct short-circuit is equivalent to a lead, and the state that inductance L 1, L2 are in charged in parallel carries out energy storage.Suppose that inverter bridge power switch pipe switch periods is T, the time under leading directly to is T
s, D then
s=T
s/ T is called straight-through duty ratio for leading directly to the percentage that the time accounts for whole switch periods.The voltage U at inductance L 1, L2 two ends during the pass-through state
L=V
Dc
When last brachium pontis or down during three power switch pipes conducting simultaneously of brachium pontis, 7 conductings of driving power switch transistor T, inductance L 1, L2 be by above-mentioned power switch pipe T7 afterflow, at this moment the voltage U at inductance L 1, L2 two ends
L=0.When from out of phase up and down two power switch pipe conductings, diode D1 and diode D2 all end, diode D3 conducting, and this moment, two inductance L 1, L2 and direct voltage source Vdc provided energy to load or electrical network together.If in the switch periods, to time of load or mains supply be T
a, D then
a=T
a/ T is called active duty ratio.During this, the voltage at inductance L 1, L2 two ends
V wherein
DcBe DC power supply voltage, Vo is the inverter output line voltage.
By the weber equilibrium principle of inductance in a switch periods, namely the integration of the voltage at inductance two ends in a switch periods is zero characteristic:
Can derive suc as formula (2):
Same current source inverter with weber equilibrium principle analysis conventional, can release output voltage gain suc as formula (3):
Above-mentioned various in, V
DcBe DC power supply voltage, Vo is the inverter output line voltage, D
sBe straight-through duty ratio, D
aBe active duty ratio.Comparison expression (2), formula (3) as can be seen, high-gain current type inverter is than traditional current source inverter voltage gain height in the present embodiment.Can obtain the higher voltage gain by regulating active duty ratio and straight-through duty ratio, thereby increase the scope of inverter input direct voltage, owing to introduced the afterflow state, input and output can also realize power decoupled.
Concrete implementation result:
High-gain current type inverter shown in Figure 1 has been carried out the principles simulation checking, simulation result shown in Fig. 4 a, Fig. 4 b, Fig. 4 c and Fig. 4 d, direct voltage source V
Dc=60V, inductance L 1=L2=5mH; Wherein, Fig. 4 a and Fig. 4 b are respectively modulation degree m=0.5, straight-through duty ratio D
s=0.4 o'clock inverter output line voltage and three-phase phase current waveform, as can be seen from the figure inverter output line voltage peak value reaches 210V, and three-phase output current phase waveform quality is good; Fig. 4 c and Fig. 4 d are modulation degree m=0.5, straight-through duty ratio D
sBecame 0.3 o'clock inverter output line voltage and three-phase phase current waveform, as can be seen from the figure D at 0.2 second by 0.4
s=0.3 o'clock output line voltage peak value is 180V, and the dynamic characteristic of inverter is good.
High-gain current type inverter of the present invention, the insertion switch inductance network, and by the straight-through vector of insertion portion in traditional zero vector, inverter can be realized the higher inversion ability of boosting, when being applied to new forms of energy such as photovoltaic and generating electricity by way of merging two or more grid systems, can also realize input power and the decoupling zero of the power output that is incorporated into the power networks control.Inverter does not have the relatively poor electrochemical capacitor of dependability, so the life-span of inverter obtains prolonging.
Claims (4)
1. high-gain current type inverter is characterized in that:
Form the switched inductors network by diode D1, inductance L 1, inductance L 2, diode D2, diode D3 and power switch pipe T7; The anode of the negative electrode of the positive terminal of DC power supply Vdc and power switch pipe T7, diode D1, and an end of inductance L 2 connects jointly; The negative electrode of the collector electrode of power switch pipe T7 and diode D2, and an end of inductance L 1 connects jointly; The other end of the negative electrode of diode D1 and inductance L 1, and the negative electrode of diode D3 connects jointly; The anode of the other end of inductance L 2 and diode D2, and the anode of diode D3 connects jointly;
Form three-phase electricity flow pattern inverter bridge jointly by last brachium pontis each power switch pipe T1, T3, T5 and following brachium pontis each power switch pipe T4, T6 and T2, the negative electrode of the negative pole end of DC power supply Vdc and described power switch pipe T4, T6 and T2 is connected to tie point n jointly, and the collector electrode of described power switch pipe T1, T3 and T5 and the collector electrode of power switch pipe T7 are connected to tie point c jointly; Output setting at described three phase inverter bridge is the capacitive filter that " Y " shape connects and composes by three filter capacitor Cf, forms three-phase filtering output; Three phase network or three-phase alternating current load are connected with described three-phase filtering output by filter inductance Lf.
2. high-gain current type inverter according to claim 1 is characterized in that:
Described power switch pipe T7, T1, T3, T5, T4, T6 and T2 are made up of the insulated gate bipolar transistor IGBT series diode, the emitter of described insulated gate bipolar transistor IGBT links to each other with the anode of diode, the collector electrode of the very described power switch pipe of the current collection of insulated gate bipolar transistor IGBT, the negative electrode of diode are the negative electrode of described power switch pipe;
Or described power switch pipe T7, T1, T3, T5, T4, T6 and T2 are made up of field of electric force effect transistor MOSFET series diode, the source electrode of described field of electric force effect transistor MOSFET links to each other with the anode of diode, the drain electrode of field of electric force effect transistor MOSFET is the collector electrode of described power switch pipe, and the negative electrode of diode is the negative electrode of described power switch pipe;
Or described power switch pipe T7, T1, T3, T5, T4, T6 and T2 are single reverse blocking transistor npn npn RB-IGBT, the collector electrode of the very described power switch pipe of current collection of reverse blocking transistor npn npn RB-IGBT, the negative electrode of the very described power switch pipe of emission of reverse blocking transistor npn npn RB-IGBT.
3. high-gain current type inverter according to claim 1, it is characterized in that: described high-gain current type inverter has three kinds of operating states: be respectively:
Pass-through state: the last brachium pontis of same phase and the conducting simultaneously of following brachium pontis power switch pipe in the described three-phase electricity flow pattern inverter bridge, described three-phase electricity flow pattern inverter bridge is in pass-through state;
The afterflow state: three power switch pipe conductings simultaneously on the last brachium pontis of described three-phase electricity flow pattern inverter bridge or the following brachium pontis, described power switch pipe T7 conducting, described three-phase electricity flow pattern inverter bridge is in the afterflow state;
Active state: two out of phase upward brachium pontis and the conductings of following brachium pontis power switch pipe in the described three-phase electricity flow pattern inverter bridge, described three-phase electricity flow pattern inverter bridge is active state.
4. high-gain current type inverter according to claim 3 is characterized in that: when described three-phase electricity flow pattern inverter bridge is pass-through state, and described diode D1 and the equal conducting of diode D2, described diode D3 ends; When described three-phase electricity flow pattern inverter bridge is the afterflow state, described diode D1 and the equal conducting of diode D2, described diode D3 ends; When described three-phase electricity flow pattern inverter bridge was active state, described diode D1 and diode D2 all ended, described diode D3 conducting.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103915873A (en) * | 2014-03-28 | 2014-07-09 | 云南电力试验研究院（集团）有限公司电力研究院 | Transformer substation direct-current system based on secondary battery and super capacitor hybrid energy storage |
| CN104716855A (en) * | 2015-04-09 | 2015-06-17 | 山东科技大学 | Current-type quasi-impedance source inverter with two-way power flow |
| CN105141165A (en) * | 2015-08-24 | 2015-12-09 | 苏州市博得立电源科技有限公司 | Vehicle power supply inverter |
| CN105553319A (en) * | 2015-12-31 | 2016-05-04 | 燕山大学 | Single-stage non-isolated Buck-Boost three-phase photovoltaic inverter and control method thereof |
| CN107947620A (en) * | 2017-12-14 | 2018-04-20 | 合肥工业大学 | Tri-state high-gain current source type invertor operation control method |
| CN108599577A (en) * | 2018-06-06 | 2018-09-28 | 三峡大学 | A kind of adjustable large capacity height boosting isolation type DC-DC converter of bridge arm number |
| CN113437878A (en) * | 2021-06-30 | 2021-09-24 | 燕山大学 | Current type DC/DC isolation converter |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103915873A (en) * | 2014-03-28 | 2014-07-09 | 云南电力试验研究院（集团）有限公司电力研究院 | Transformer substation direct-current system based on secondary battery and super capacitor hybrid energy storage |
| CN104716855A (en) * | 2015-04-09 | 2015-06-17 | 山东科技大学 | Current-type quasi-impedance source inverter with two-way power flow |
| CN105141165A (en) * | 2015-08-24 | 2015-12-09 | 苏州市博得立电源科技有限公司 | Vehicle power supply inverter |
| CN105553319A (en) * | 2015-12-31 | 2016-05-04 | 燕山大学 | Single-stage non-isolated Buck-Boost three-phase photovoltaic inverter and control method thereof |
| CN105553319B (en) * | 2015-12-31 | 2018-04-06 | 燕山大学 | A kind of control method of the non-isolated Buck Boost three-phase photovoltaic inverters of single-stage |
| CN107947620A (en) * | 2017-12-14 | 2018-04-20 | 合肥工业大学 | Tri-state high-gain current source type invertor operation control method |
| CN107947620B (en) * | 2017-12-14 | 2019-09-06 | 合肥工业大学 | Tri-state high-gain current source type invertor operation control method |
| CN108599577A (en) * | 2018-06-06 | 2018-09-28 | 三峡大学 | A kind of adjustable large capacity height boosting isolation type DC-DC converter of bridge arm number |
| CN108599577B (en) * | 2018-06-06 | 2023-10-27 | 三峡大学 | Bridge arm number adjustable high-capacity high-boost isolation type DC-DC converter |
| CN113437878A (en) * | 2021-06-30 | 2021-09-24 | 燕山大学 | Current type DC/DC isolation converter |
| CN113437878B (en) * | 2021-06-30 | 2022-07-12 | 燕山大学 | Current type DC/DC isolation converter |
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| CN103259442B (en) | 2016-03-02 |
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