CN103259442B - A kind of High-gain current type inverter - Google Patents
A kind of High-gain current type inverter Download PDFInfo
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- CN103259442B CN103259442B CN201310196667.9A CN201310196667A CN103259442B CN 103259442 B CN103259442 B CN 103259442B CN 201310196667 A CN201310196667 A CN 201310196667A CN 103259442 B CN103259442 B CN 103259442B
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Abstract
The invention discloses a kind of High-gain current type inverter, it is characterized in that: form switched inductors network by diode D1, inductance L 1, inductance L 2, diode D2, diode D3 and power switch pipe T7; Three-phase current type inverter bridge is jointly formed by upper brachium pontis each power switch pipe T1, T3, T5 and lower brachium pontis each power switch pipe T4, T6 and T2, the capacitive filter connected and composed in " Y " shape by three filter capacitor Cf is set at the output of three phase inverter bridge, forms three-phase filtering and export; Three phase network or three-phase alternating current load to be exported with three-phase filtering by filter inductance Lf and are connected.The present invention effectively can improve inverter DC input voitage scope, and DC side does not need electrochemical capacitor simultaneously, improves reliability, and system configuration is simple, reduces costs, raises the efficiency.
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 the regenerative resources such as solar energy, tidal energy, geothermal energy produce, and needs by power electronic equipment boosting inversion supply AC load or electrical network.Inverter is the important component part of power electronic equipment, and the research tool in today that new energy grid-connected power develops rapidly to inversion transformation technique is of great significance.
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, limit its application in some occasions.The Z-source inverter of recent proposition is also used widely in various occasion, the advantage that it has conventional inverter not have, but also has its weak point.
1, voltage source inverter is a kind of voltage-dropping type inverter, ac output voltage can only lower than DC bus-bar voltage, some input dc powers are forced down, unstable occasion, as fuel cell, photovoltaic generation, wind power generation occasion, need to increase DC-DC boosting in prime, which increase complexity and the cost of system, reduce efficiency and the reliability of system simultaneously.Can also by boosting grid-connected at interchange side joint Industrial Frequency Transformer, but Industrial Frequency Transformer volume is large, price is high, heavy, also reduce efficiency.The upper and lower bridge arm of the same phase of inverter can not lead directly to, otherwise can damage inverter.But the false triggering caused due to electromagnetic interference in reality causes straight-through happening occasionally, and usually needs to add dead band, but can cause the distortion of output waveform.The electrochemical capacitor temperature influence of voltage source inverter DC side is comparatively large, and its low reliability reduces the life-span of inverter.
2, current source inverter is booster type inverter, but its boost capability is limited, and the inductance of DC side is general also comparatively large, adds cost.During for generations of electricity by new energy such as photovoltaics, input-output power is difficult to realize uneoupled control.Inverter leg can not be opened a way, otherwise can damage inverter, usually needs to add the overlapping conducting time between upper and lower two switching tubes of same brachium pontis, can cause distortion equally.
3, Z-source inverter has stepping functions, and bridge arm direct pass is its a kind of normal operating conditions.But owing to adding an inductance capacitance Z source network, under certain condition, may there is resonance in inductance capacitance, affects circuit and normally work.During startup, impulse current is large, likely damages inverter.Two capacitance requirements are completely the same, and electric capacity is inconsistent will damage inverter.
Summary of the invention
The present invention is in order to avoid the weak point existing for above-mentioned prior art, proposes a kind of High-gain current type inverter.To improving inverter DC input voitage scope, DC side does not need electrochemical capacitor simultaneously, improves reliability, and system configuration is simple, reduces cost, improves efficiency.
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:
Switched inductors network is formed by diode D1, inductance L 1, inductance L 2, diode D2, diode D3 and power switch pipe T7; The anode of the positive terminal of DC power supply Vdc and the negative electrode of power switch pipe T7, diode D1, and one end of inductance L 2 connects jointly; The collector electrode of power switch pipe T7 and the negative electrode of diode D2, and one end of inductance L 1 connects jointly; The negative electrode of diode D1 and the other end of inductance L 1, and the negative electrode of diode D3 connects jointly; The other end of inductance L 2 and the anode of diode D2, and the anode of diode D3 connects jointly;
Three-phase current type inverter bridge is jointly formed by upper brachium pontis each power switch pipe T1, T3, T5 and lower brachium pontis each power switch pipe T4, T6 and T2, negative pole end and the negative electrode of described power switch pipe T4, T6 and T2 of DC power supply Vdc are connected for tie point n jointly, and described power switch pipe T1, T3 are connected for tie point c with the collector electrode of T5 and the collector electrode of power switch pipe T7 jointly; The capacitive filter connected and composed in " Y " shape by three filter capacitor Cf is set at the output of described three phase inverter bridge, forms three-phase filtering and export; Three phase network or three-phase alternating current load to be exported with described three-phase filtering by filter inductance Lf and are connected.
The design feature of High-gain current type inverter of the present invention is also:
Described power switch pipe T7, T1, T3, T5, T4, T6 and T2 are made up of insulated gate bipolar transistor IGBT series diode, the emitter of described insulated gate bipolar transistor IGBT is connected with the anode of diode, the collector electrode of the very described power switch pipe of current collection of insulated gate bipolar transistor IGBT, 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 made up of field of electric force effect transistor MOSFET series diode, the source electrode of described field of electric force effect transistor MOSFET is connected 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 transmitting of reverse blocking transistor npn npn RB-IGBT.
The design feature of High-gain current type inverter of the present invention is also: described High-gain current type inverter has three kinds of operating states: respectively:
Pass-through state: the upper brachium pontis of same phase and the conducting simultaneously of lower brachium pontis power switch pipe in described three-phase current type inverter bridge, described three-phase current type inverter bridge is in pass-through state;
Freewheeling state: three power switch pipes conductings simultaneously on the upper brachium pontis of described three-phase current type inverter bridge or lower brachium pontis, described power switch pipe T7 conducting, described three-phase current type inverter bridge is in freewheeling state;
Active: two out of phase upper brachium pontis and the conducting of lower brachium pontis power switch pipe in described three-phase current type inverter bridge, described three-phase current type inverter bridge is active.
When described three-phase current type inverter bridge is pass-through state, described diode D1 and the equal conducting of diode D2, described diode D3 ends; When described three-phase current type inverter bridge is freewheeling state, described diode D1 and the equal conducting of diode D2, described diode D3 ends; When described three-phase current type inverter bridge is active, described diode D1 and diode D2 all ends, 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 DC-DC level, decreases device count, reduce cost, improve efficiency.Because voltage gain is higher, required photovoltaic module number is few, which decreases because partial occlusion and photovoltaic module do not mate caused power loss.
2, the present invention's electrochemical capacitor of not having dependability poor, because electrochemical capacitor temperature influence is very large, it is the key factor affecting inverter longevity, and therefore the life-span of inverter of the present invention is long.
3, under the present invention can be operated in straight-through and open-circuit condition, do not need in brachium pontis switching signal, to add dead band as traditional voltage source inverter, do not need in brachium pontis switching signal, to add the superimposed flow time as traditional current source inverter yet, control simpler, output waveform better quality.Owing to introducing freewheeling state, inverter can realize the uneoupled control of input-output power.
4, the present invention can be widely used in various generation of electricity by new energy, and because cost is lower, efficiency is high, has higher cost performance, contributes to the development promoting new forms of energy.Along with the appearance of the new devices such as reverse IGBT capable of blocking, this inverter no longer needs series diode, and solve the loss problem of series diode, its advantage will be more obvious.
Accompanying drawing explanation
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 in the present invention;
Fig. 3 a is High-gain current type inverter of the present invention is pass-through state schematic diagram;
Fig. 3 b is High-gain current type inverter of the present invention is freewheeling state schematic diagram;
Fig. 3 c is High-gain current type inverter of the present invention is active schematic diagram;
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, in the present embodiment, the version of High-gain current type inverter is, forms 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 positive terminal of DC power supply Vdc and the negative electrode of power switch pipe T7, diode D1, and one end of inductance L 2 connects jointly; The collector electrode of power switch pipe T7 and the negative electrode of diode D2, and one end of inductance L 1 connects jointly; The negative electrode of diode D1 and the other end of inductance L 1, and the negative electrode of diode D3 connects jointly; The other end of inductance L 2 and the anode of diode D2, and the anode of diode D3 connects jointly;
Three-phase current type inverter bridge is jointly formed by upper brachium pontis each power switch pipe T1, T3, T5 and lower brachium pontis each power switch pipe T4, T6 and T2, the negative pole end of DC power supply Vdc and the negative electrode of power switch pipe T4, T6 and T2 are connected for tie point n jointly, and power switch pipe T1, T3 are connected for tie point c with the collector electrode of T5 and the collector electrode of power switch pipe T7 jointly; The capacitive filter connected and composed in " Y " shape by three filter capacitor Cf is set at the output of three phase inverter bridge, forms three-phase filtering and export; Three phase network or three-phase alternating current load to be exported with three-phase filtering by filter inductance Lf and are connected.
As shown in Figure 2 a, in the present embodiment, power switch pipe T7, T1, T3, T5, T4, T6 and T2 can be made up of insulated gate bipolar transistor IGBT series diode, the emitter of insulated gate bipolar transistor IGBT is connected with the anode of diode, the collector electrode of the current collection of insulated gate bipolar transistor IGBT very power switch pipe, the negative electrode of diode is the negative electrode of power switch pipe; Or as shown in Figure 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 is connected 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 as shown in Figure 2 c, 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 current collection of reverse blocking transistor npn npn RB-IGBT very power switch pipe, the negative electrode of the transmitting of reverse blocking transistor npn npn RB-IGBT very power switch pipe.
In the present embodiment, High-gain current type inverter has three kinds of operating states: respectively:
Pass-through state as shown in Figure 3 a: the upper brachium pontis of same phase and the conducting simultaneously of lower brachium pontis power switch pipe in three-phase current type inverter bridge, three-phase current type inverter bridge is in pass-through state.
Freewheeling state as shown in Figure 3 b: three power switch pipes conductings simultaneously on the upper brachium pontis of three-phase current type inverter bridge or lower brachium pontis, power switch pipe T7 conducting, three-phase current type inverter bridge is in freewheeling state.
Active as shown in Figure 3 c: two out of phase upper brachium pontis and the conducting of lower brachium pontis power switch pipe in three-phase current type inverter bridge, three-phase current type inverter bridge is active.
When a phase bridge arm direct pass of inverter, diode D1 and diode D2 is all in conducting state, and inverter bridge direct short-circuit is equivalent to a wire, 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 straight-through is T
s, then D
s=T
s/ T is the percentage straight-through time accounting for whole switch periods, is called straight-through duty ratio.The voltage U at inductance L 1, L2 two ends during pass-through state
l=V
dc.
When three power switch pipes conducting simultaneously of upper brachium pontis or lower brachium pontis, driving power switch transistor T 7 conducting, inductance L 1, L2 by above-mentioned power switch pipe T7 afterflow, the now voltage U at inductance L 1, L2 two ends
l=0.When from out of phase upper and lower two power switch pipe conductings, diode D1 and diode D2 all ends, diode D3 conducting, and now two inductance L 1, L2 provide energy to load or electrical network together with direct voltage source Vdc.If in a switch periods, the time to load or mains supply is T
a, then D
a=T
a/ T is called active duty ratio.During this, the voltage at inductance L 1, L2 two ends
wherein V
dcfor direct current power source voltage, Vo is inverter output line voltage.
By the voltage-second balance principle of inductance in a switch periods, namely the integration of voltage in a switch periods at inductance two ends is the characteristic of zero:
Can derive such as formula (2):
The current source inverter that same voltage-second balance principle analysis is traditional, output voltage gain can be released such as formula (3):
Above-mentioned various in, V
dcfor direct current power source voltage, Vo is inverter output line voltage, D
sfor straight-through duty ratio, D
afor active duty ratio.Comparison expression (2), formula (3) can be found out, in the present embodiment, High-gain current type inverter is higher than traditional current source inverter voltage gain.By regulating active duty ratio and straight-through duty ratio can obtain higher voltage gain, thus increase the scope of inverter input direct voltage, owing to introducing freewheeling state, input and output can also realize power decoupled.
Concrete implementation result:
Principles simulation checking has been carried out to the High-gain current type inverter shown in Fig. 1, simulation result as 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 is modulation degree m=0.5 respectively, straight-through duty ratio D
sinverter output line voltage and three-phase phase current waveform when=0.4, 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 is modulation degree m=0.5, straight-through duty ratio D
sinverter output line voltage and three-phase phase current waveform, as can be seen from the figure D when within 0.2 second, becoming 0.3 from 0.4
swhen=0.3, output line voltage peak value is 180V, and the dynamic characteristic of inverter is good.
High-gain current type inverter of the present invention, insertion switch inductance network, and lead directly to vector by insertion portion in traditional zero vector, inverter can realize higher boosting inversion ability, when being applied to the new energy grid-connected powers such as photovoltaic, the uneoupled control of input power and grid-connected power output can also be realized.The electrochemical capacitor that inverter does not have dependability poor, therefore the life-span of inverter is extended.
Claims (1)
1. a High-gain current type inverter, is characterized in that:
Switched inductors network is formed by diode D1, inductance L 1, inductance L 2, diode D2, diode D3 and power switch pipe T7; The anode of the positive terminal of DC power supply Vdc and the negative electrode of power switch pipe T7, diode D1, and one end of inductance L 2 connects jointly; The collector electrode of power switch pipe T7 and the negative electrode of diode D2, and one end of inductance L 1 connects jointly; The negative electrode of diode D1 and the other end of inductance L 1, and the negative electrode of diode D3 connects jointly; The other end of inductance L 2 and the anode of diode D2, and the anode of diode D3 connects jointly;
Three-phase current type inverter bridge is jointly formed by upper brachium pontis each power switch pipe T1, T3, T5 and lower brachium pontis each power switch pipe T4, T6 and T2, negative pole end and the negative electrode of described power switch pipe T4, T6 and T2 of DC power supply Vdc are connected for tie point n jointly, and described power switch pipe T1, T3 are connected for tie point c with the collector electrode of T5 and the collector electrode of power switch pipe T7 jointly; The capacitive filter connected and composed in " Y " shape by three filter capacitor Cf is set at the output of described three phase inverter bridge, forms three-phase filtering and export; Three phase network or three-phase alternating current load to be exported with described three-phase filtering by filter inductance Lf and are connected;
Described power switch pipe T7, T1, T3, T5, T4, T6 and T2 are made up of insulated gate bipolar transistor IGBT series diode, the emitter of described insulated gate bipolar transistor IGBT is connected with the anode of diode, the collector electrode of the very described power switch pipe of current collection of insulated gate bipolar transistor IGBT, 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 made up of field of electric force effect transistor MOSFET series diode, the source electrode of described field of electric force effect transistor MOSFET is connected 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 transmitting of reverse blocking transistor npn npn RB-IGBT;
Described High-gain current type inverter has three kinds of operating states: respectively:
Pass-through state: the upper brachium pontis of same phase and the conducting simultaneously of lower brachium pontis power switch pipe in described three-phase current type inverter bridge, described three-phase current type inverter bridge is in pass-through state; When described three-phase current type inverter bridge is pass-through state, described diode D1 and the equal conducting of diode D2, described diode D3 ends;
Freewheeling state: three power switch pipes conductings simultaneously on the upper brachium pontis of described three-phase current type inverter bridge or lower brachium pontis, described power switch pipe T7 conducting, described three-phase current type inverter bridge is in freewheeling state; When described three-phase current type inverter bridge is freewheeling state, described diode D1 and the equal conducting of diode D2, described diode D3 ends;
Active: two out of phase upper brachium pontis and the conducting of lower brachium pontis power switch pipe in described three-phase current type inverter bridge, described three-phase current type inverter bridge is active; When described three-phase current type inverter bridge is active, described diode D1 and diode D2 all ends, described diode D3 conducting;
When a phase bridge arm direct pass of inverter, diode D1 and diode D2 is all in conducting state, and inverter bridge direct short-circuit is equivalent to a wire, 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 straight-through time is T
s, then D
s=T
s/ T is the percentage straight-through time accounting for whole switch periods, is called straight-through duty ratio, the voltage U at inductance L 1, L2 two ends during pass-through state
l=V
dc;
When three power switch pipes conducting simultaneously of upper brachium pontis or lower brachium pontis, driving power switch transistor T 7 conducting, inductance L 1, L2 by above-mentioned power switch pipe T7 afterflow, the now voltage U at inductance L 1, L2 two ends
l=0;
When from out of phase upper and lower two power switch pipe conductings, diode D1 and diode D2 all ends, diode D3 conducting, and now two inductance L 1, L2 provide energy to load or electrical network together with direct voltage source Vdc; If in a switch periods, the time to load or mains supply is T
a, then D
a=T
a/ T is called active duty ratio; During this, the voltage at inductance L 1, L2 two ends
wherein V
dcfor direct current power source voltage, Vo is inverter output line voltage;
By the voltage-second balance principle of inductance in a switch periods, namely the integration of voltage in a switch periods at inductance two ends is the characteristic of zero:
Then derive formula (2):
Wherein, V
dcfor direct current power source voltage, Vo is inverter output line voltage, D
sfor straight-through duty ratio, D
afor active duty ratio; By regulating active duty ratio D
awith straight-through duty ratio D
sobtain higher voltage gain, thus increase the scope of inverter input direct voltage, owing to introducing freewheeling state, input and output realize power decoupled.
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| CN103915873B (en) * | 2014-03-28 | 2016-09-28 | 云南电力试验研究院（集团）有限公司电力研究院 | A kind of transformer station direct current system based on secondary cell Yu super capacitor hybrid energy-storing |
| 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 |
| 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 |
| 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 |
| 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 |
| CN113437878B (en) * | 2021-06-30 | 2022-07-12 | 燕山大学 | Current type DC/DC isolation converter |
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