CN103178742A - Topological structure of combined bidirectional DC/AC (direct current/alternating current) converter - Google Patents
Topological structure of combined bidirectional DC/AC (direct current/alternating current) converter Download PDFInfo
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Abstract
The invention discloses a topological structure of a combined bidirectional DC/AC (direct current/alternating current) converter, and belongs to the technical field of power conversion. The topological structure is characterized in that the topological structure comprises three-phase circuits which are the same with one another; each phase comprises an isolating half-bridge DC/DC converter and a cascading H-bridge DC/AC converter; the output terminal of the isolating half-bridge DC/DC converter is connected with a first capacitor (C1) in parallel and then is served as the input terminal of the cascading H-bridge DC/AC converter; each stage of H bridge is connected with an independent isolating half-bridge DC/DC converter; and EMTDC electro-magnetic transient simulation performed to circuit topology under typical parameters shows that the topological structure has a high voltage matching capability, and bidirectional flow of energy can be realized through phase-shifting control. The topological structure can be applied to occasions of high-power adjustment based on battery energy storage, energy storage power station, smooth renewable energy source generated output power, frequency and voltage adjustment in microgrid and the like, and has a broad application prospect.
Description
Technical field
The invention belongs to the power converter technical field, relate in particular to a kind of combined bidirectional DC/AC converter topologies.
Background technology
The renewable energy power generation technology is the study hotspot that competitively chase present countries in the world, has the problem of two aspects to gain a special interest.
One due to the intermittence that has and the fluctuation of the regenerative resources such as wind energy and solar energy, causes the regenerative resource electric energy that is incorporated into the power networks to bring great challenge to the stable and control of electric power system.Friendly, schedulable regenerative resource electric energy is the target that people yearn for and pursue.And energy storage and power back-off technology are the keys that addresses this problem, in the urgent need to realizing the unified power conversion unit of reactive power compensation and two-way active power regulation.
Its two, new and effective, large-scale renewable energy power generation current transformer research cheaply is also present focus.Take photovoltaic generation as example, mostly adopt at present the technical scheme of " inversion+boosting+confluxing ".Because commercial at present heap(ed) capacity cell is 500kW with the inverter capacity, need use 200 photovoltaic cell inverters and 100 three winding transformer with split windings for hundred megawatt photovoltaic plants.Hardware cost is high and floor space is large, has limited greatly the utilization and extention of photovoltaic power generation technology, needs the technical scheme that research and development are low-cost, floor space is little badly.
Dedoncker R W etc. has applied for Power conversion apparatus for DC-DC conversion using dual active bridges United States Patent (USP) (U.S. Patent No:5027264), proposition is by two square wave input voltages and power adjustments, and realizes zero voltage switch by means of transformer leakage inductance and external inductance.Chinese utility model patent CN 202617004U is improved on this basis, has obtained a kind of isolation type bidirectional DC/DC converter.And classical tandem type H bridge DC/AC converter by means of suitable control strategy, can be realized the flow of power that the AC and DC side is two-way based on the series connection of a plurality of single-phase electricity die mould full bridge inverters unit.If both are improved and organically blend, can realize the power conversion of bidirectional high-efficiency DC/AC.
The present invention proposes a kind of novel combined bidirectional DC/AC converter topologies, this topology reaches the combination of " the tandem type H bridge DC/AC converter " of directly incorporating the AC electrical network into based on flexible " isolated form half-bridge DC/DC converter ", can realize the active power two-way flow of AC and DC side and the reactive power compensation of AC system, and have very wide voltage matches ability.Be applicable to the occasions such as frequency modulation and voltage modulation of being incorporated into the power networks of the meritorious adjusting of renewable energy power generation factory and reactive power compensation, large-sized photovoltaic power station, little electrical network, have broad application prospects.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can be applicable to but be not limited to the combined bidirectional DC/AC converter topologies of the occasions such as power adjustments and photovoltaic electric station grid connection, the power output that is used for level and smooth renewable energy power generation reduces it to the adverse effects such as impact of electrical network etc.
Technical scheme of the present invention:
A kind of combined bidirectional DC/AC converter topologies, this topology is comprised of identical three-phase circuit, each is combined by isolated half-bridge DC/DC current transformer and tandem type H bridge DC/AC current transformer, after output-parallel first capacitor of isolated half-bridge DC/DC current transformer, as the input of tandem type DC/AC current transformer single-stage H bridge, every one-level H bridge all is connected with isolated half-bridge DC/DC current transformer independently.
Isolated half-bridge DC/DC current transformer comprises the first switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube, the second capacitor, the 3rd capacitor, the 4th capacitor, the 5th capacitor, high-frequency isolation transformer, power filter inductance, resonant inductance; Its connection: the positive pole of DC power supply is through being connected in after the power filter inductance on the brachium pontis that is comprised of the first switching tube and second switch pipe, it is in parallel that this brachium pontis forms another brachium pontis with the second capacitor and the 3rd capacitor, the output of two brachium pontis is parallel to the primary side of high-frequency isolation transformer through resonant inductance, the secondary side output of high-frequency isolation transformer is connected on the brachium pontis that is comprised of the 4th capacitor and the 5th capacitor.
tandem type H bridge DC/AC current transformer comprises the 5th switching tube, the 6th switching tube, the 7th switching tube, the 8th switching tube, the first output inductor, the second output inductor, its connection: the right brachium pontis that the left brachium pontis that the 5th switching tube and the 7th switching tube form and the 6th switching tube and the 8th switching tube form all is parallel to the first capacitor, the 5th switching tube connects output the first output inductor as an output of described combined bidirectional DC/AC current transformer with the left brachium pontis that the 7th switching tube forms, and the right brachium pontis that the 6th switching tube and the 8th switching tube form is linked the left brachium pontis of next stage H bridge, with this rule cascade one-level H bridge to the last, the right brachium pontis of afterbody H bridge is through the second output inductor another output as described combined bidirectional DC/AC current transformer.
The first output inductor of tandem type H bridge DC/AC current transformer and the reactance value of the second output inductor are zero or non-vanishing.
The various switching tubes of isolated half-bridge DC/DC current transformer and tandem type H bridge DC/AC current transformer are metal oxide layer semiconductor field-effect transistor or insulated gate bipolar transistor, and equal reverse parallel connection diode.
The AC of tandem type DC/AC current transformer is connected or is connected with AC load with three phase network.
The present invention has following advantage:
1) isolated half-bridge DC/DC current transformer has flexible and changeable topological structure, can improve the voltage gain of current transformer by the series connection of a plurality of voltage multipliers of input side, improves the power of current transformer by the parallel connection of a plurality of power diode branch roads of outlet side.
2) can realize the transformation of dc voltage is regulated by the switching tube duty ratio of adjusting isolated half-bridge DC/DC current transformer, has very wide voltage matches ability, under the very large condition of input side (generally connecing battery pack) voltage fluctuation, can keep the constant of outlet side DC bus-bar voltage, to guarantee the normal operation of tandem type H bridge DC/AC converter.
3) adjusting of power can be carried out by the phase shifting angle of adjusting isolated half-bridge DC/DC current transformer high frequency transformer both sides switching tube, and the two-way flow of energy can be realized.
4) isolated half-bridge DC/DC current transformer can be worked under higher switching frequency, can greatly reduce volume and the cost of isolating transformer.
5) by the cascade system of a plurality of H bridges, can make device directly access high-voltage fence (10kV or 35kV), saved the transformer that is incorporated into the power networks, further reduce installation cost.
Description of drawings
Fig. 1 is combined bidirectional DC/AC converter topologies of the present invention.
Fig. 2 is for when dc voltage U1=U2=Un=60V, and S1 and S3 when power ratio control is exported 6kW from the DC side to the AC cut-off waveform.
Fig. 3 is when dc voltage U1=U2=Un=60V, the stable state waveform of the voltage U p0 of resonant inductance Ls both sides and Up1 when power ratio control is exported 6kW from the DC side to the AC.
Fig. 4 is when dc voltage U1=U2=Un=60V, the transient-wave of power output when power ratio control is exported 6kW from the DC side to the AC.
Fig. 5 is for when dc voltage U1=U2=Un=48V, and S1 and S3 when power ratio control is exported 6kW from the DC side to the AC cut-off waveform.
Fig. 6 is when dc voltage U1=U2=Un=48V, the transient-wave of power output when power ratio control is exported 6kW from the DC side to the AC.
Fig. 7 is for when dc voltage U1=U2=Un=60V, and S1 and S3 when power ratio control is exported 6kW from the AC to the DC side cut-off waveform.
Fig. 8 is when dc voltage U1=U2=Un=60V, the transient-wave of power output when power ratio control is exported 6kW from the AC to the DC side.
Fig. 9 is the first distortion topology of combined bidirectional DC/AC current transformer of the present invention.
Figure 10 is the second distortion topology of combined bidirectional DC/AC current transformer of the present invention.
Embodiment
As shown in Figure 1, a kind of combined bidirectional DC/AC converter topologies, combined by isolated half-bridge DC/DC current transformer and tandem type H bridge DC/AC current transformer, after the output-parallel first capacitor C1 of isolated half-bridge DC/DC current transformer, as the input of tandem type DC/AC current transformer single-stage H bridge, every one-level H bridge all is connected with isolated half-bridge DC/DC current transformer independently.Isolated half-bridge DC/DC current transformer comprises the first switching tube S1, second switch pipe S2, the 3rd switching tube S3, the 4th switching tube S4, the second capacitor C2, the 3rd capacitor C3, the 4th capacitor C4, the 5th capacitor C5, high-frequency isolation transformer T, power filter inductance L i, resonant inductance Ls; The positive pole of DC power supply U1 is through being connected in after power filter inductance L i on the brachium pontis that is comprised of the first switching tube S1 and second switch pipe S2, it is in parallel that this brachium pontis forms another brachium pontis with the second capacitor C2 and the 3rd capacitor C3, the output of two brachium pontis is parallel to the primary side of high-frequency isolation transformer T through resonant inductance Ls, the secondary side output of high-frequency isolation transformer T is connected on the brachium pontis that is comprised of the 4th capacitor C4 and the 5th capacitor C5.tandem type H bridge DC/AC current transformer comprises the 5th switching tube S5, the 6th switching tube S6, the 7th switching tube S7, the 8th switching tube S8, the first output inductor Lo1, the second output inductor Lo2, the right brachium pontis that the left brachium pontis that the 5th switching tube S5 and the 7th switching tube S7 form and the 6th switching tube S6 and the 8th switching tube S8 form all is parallel to the first capacitor C1, the 5th switching tube S5 connects output the first output inductor Lo1 as an output of described combined bidirectional DC/AC current transformer with the left brachium pontis that the 7th switching tube S7 forms, and the right brachium pontis that the 6th switching tube S5 and the 8th switching tube S8 form is linked the left brachium pontis of next stage H bridge, with this rule cascade one-level H bridge to the last, the right brachium pontis of afterbody H bridge is through the second output inductor Lo2 another output as described combined bidirectional DC/AC current transformer.
The first output inductor Lo1 of tandem type H bridge DC/AC current transformer and the reactance value of the second output inductor Lo2 are zero or non-vanishing.
The various switching tubes of isolated half-bridge DC/DC current transformer and tandem type H bridge DC/AC current transformer are metal oxide layer semiconductor field effect transistor M OSFET or insulated gate bipolar transistor IGBT, and equal reverse parallel connection diode.
The AC of tandem type DC/AC current transformer is connected or is connected with AC load with three phase network.
The below provides the exemplary operation waveform of described combined bidirectional DC/AC current transformer, so that its advantage to be described.Get the Li=2mH in Fig. 1, Ls=240 μ H, C1=3mF, C2=C3=C4=C5=10mF, Lo1=Lo2=0, transformer voltage ratio is 1:1, utilizes PSCAD/EMTDC to carry out electromagnetic transient simulation.Fig. 2 is for when dc voltage U1=U2=Un=60V, and the S1 when power ratio control is exported 6kW from the DC side to the AC and S3 cut-off waveform, and Fig. 3 is the voltage U p0 of resonant inductance Ls both sides and the stable state waveform of Up1, and Fig. 4 is the transient-wave of power output.As seen from the figure, after providing power instruction in 1.0 seconds, the duty by controlling isolated half-bridge DC/DC transformer both sides switching tube is phase shifting angle when, and the power output of current transformer has reached desired stable state in 0.5s.
S1 and S3 when Fig. 5 ~ Fig. 6 is respectively and changes dc voltage and make U1=U2=Un=48V cut-off the transient-wave of waveform and power output.Comparison diagram 5 and Fig. 2 when dc voltage reduces, have realized the transformation of dc voltage is regulated by the duty ratio that reduces isolated half-bridge DC/DC transformer both sides switching tube as can be known, make this topology have very wide voltage matches ability.
Fig. 7 ~ Fig. 8 is respectively power ratio control and exports 6kW from the AC to the DC side, and the S1 during dc voltage U1=U2=Un=60V and S3 cut-off the transient-wave of waveform and power output.Comparison diagram 7 and Fig. 2 have realized the two-way flow of energy as can be known by the phase shifting angle of adjusting isolated half-bridge DC/DC current transformer high frequency transformer both sides switching tube.
The input side voltage multiplier of the DC/DC circuit of the present invention in the combined bidirectional DC/AC current transformer described in specification and claims series connection progression N is 1, to count P be also 1 to the parallel branch of power output diode branch, is the most basic a kind of topology.The Basic Topological of mentioning in specification and claims, as Fig. 9 ~ shown in Figure 10, can also be several distortion of the basic topology that obtains on operation principle constant basis, Fig. 5 is N=1, distortion topology during P=2, Fig. 6 is N=2, the distortion topology during P=1.Therefore, what should be understood that is, the invention is not restricted to above embodiment, and a lot of distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention all should be thought protection scope of the present invention.
Topological structure proposed by the invention has very wide voltage matches ability, by means of phase shifting control, can realize the two-way flow of energy.Can be applicable to the occasions such as frequency modulation and voltage modulation in high-power adjusting, energy-accumulating power station, level and smooth renewable energy power generation power output and the little electrical network based on battery energy storage, have broad application prospects.
Claims (6)
1. combined bidirectional DC/AC converter topologies, it is characterized in that: this topology is comprised of identical three-phase circuit, each is combined by isolated half-bridge DC/DC current transformer and tandem type H bridge DC/AC current transformer, as the input of tandem type DC/AC current transformer single-stage H bridge, every one-level H bridge all is connected with isolated half-bridge DC/DC current transformer independently after output-parallel first capacitor (C1) of isolated half-bridge DC/DC current transformer.
2. a kind of combined bidirectional DC/AC converter topologies according to claim 1 is characterized in that:
Isolated half-bridge DC/DC current transformer comprises the first switching tube (S1), second switch pipe (S2), the 3rd switching tube (S3), the 4th switching tube (S4), the second capacitor (C2), the 3rd capacitor (C3), the 4th capacitor (C4), the 5th capacitor (C5), high-frequency isolation transformer (T), power filter inductance (Li), resonant inductance (Ls); Its connection: the positive pole of DC power supply (U1) is through being connected in after power filter inductance (Li) on the brachium pontis that is comprised of the first switching tube (S1) and second switch pipe (S2), it is in parallel that this brachium pontis forms another brachium pontis with the second capacitor (C2) and the 3rd capacitor (C3), the output of two brachium pontis is parallel to the primary side of high-frequency isolation transformer (T) through resonant inductance (Ls), the secondary side output of high-frequency isolation transformer (T) is connected on the brachium pontis that is comprised of the 4th capacitor (C4) and the 5th capacitor (C5).
3. a kind of combined bidirectional DC/AC converter topologies according to claim 1 is characterized in that:
tandem type H bridge DC/AC current transformer comprises the 5th switching tube (S5), the 6th switching tube (S6), the 7th switching tube (S7), the 8th switching tube (S8), the first output inductor (Lo1), the second output inductor (Lo2), its connection: the right brachium pontis that the left brachium pontis that the 5th switching tube (S5) and the 7th switching tube (S7) form and the 6th switching tube (S5) and the 8th switching tube (S8) form all is parallel to the first capacitor (C1), the 5th switching tube (S5) connects output the first output inductor (Lo1) as an output of described combined bidirectional DC/AC current transformer with the left brachium pontis that the 7th switching tube (S7) forms, and the right brachium pontis that the 6th switching tube (S6) and the 8th switching tube (S8) form is linked the left brachium pontis of next stage H bridge, with this rule cascade one-level H bridge to the last, the right brachium pontis of afterbody H bridge is through the second output inductor (Lo2) another output as described combined bidirectional DC/AC current transformer.
4. a kind of combined bidirectional DC/AC converter topologies according to claim 1 is characterized in that:
First output inductor (Lo1) of tandem type H bridge DC/AC current transformer and the reactance value of the second output inductor (Lo2) are zero or non-vanishing.
5. a kind of combined bidirectional DC/AC converter topologies according to claim 1 is characterized in that:
The various switching tubes of isolated half-bridge DC/DC current transformer and tandem type H bridge DC/AC current transformer are metal oxide layer semiconductor field-effect transistor (MOSFET) or insulated gate bipolar transistor (IGBT), and equal reverse parallel connection diode.
6. a kind of combined bidirectional DC/AC converter topologies according to claim 1 is characterized in that:
The AC of tandem type DC/AC current transformer is connected or is connected with AC load with three phase network.
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| CN103916017A (en) * | 2014-03-17 | 2014-07-09 | 陕西科技大学 | DC convertor with wide voltage range and wide load range |
| CN103944400A (en) * | 2014-04-29 | 2014-07-23 | 上海交通大学 | Bidirectional high-voltage DC/DC topological structure of multi-coil single-phase intermediate-frequency square wave transformer |
| CN104078992A (en) * | 2013-03-31 | 2014-10-01 | 张良华 | Energy-storage voltage-balanced power electronic electric energy converting system and control method thereof |
| CN104578803A (en) * | 2015-02-04 | 2015-04-29 | 荣信电力电子股份有限公司 | High-voltage direct current-direct current power electronic transformer |
| CN105162135A (en) * | 2015-08-28 | 2015-12-16 | 武汉工程大学 | Cascaded static var generator and control method thereof |
| CN105245096A (en) * | 2015-11-24 | 2016-01-13 | 哈尔滨工业大学 | High-gain three-winding cascade boost converter |
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| CN105871238A (en) * | 2016-04-19 | 2016-08-17 | 北京交通大学 | Combined cascade energy storage converter structure comprising full-bridge DC/DC |
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| CN105356774A (en) * | 2015-12-09 | 2016-02-24 | 北京能源投资（集团）有限公司 | Converter used for hybrid energy storage system |
| CN105553273B (en) * | 2015-12-24 | 2018-06-12 | 东南大学 | Suitable for the grid-connected cascade DC/DC converters of mesohigh direct current and its control method |
| CN105553273A (en) * | 2015-12-24 | 2016-05-04 | 东南大学 | Cascade DC/DC converter suitable for middle-high voltage direct-current grid connection and control method for cascade DC/DC converter |
| CN105871238A (en) * | 2016-04-19 | 2016-08-17 | 北京交通大学 | Combined cascade energy storage converter structure comprising full-bridge DC/DC |
| CN107046369A (en) * | 2017-03-27 | 2017-08-15 | 盐城工学院 | One kind boosting three-phase half-bridge converter and its control method |
| CN107769389A (en) * | 2017-10-24 | 2018-03-06 | 华南理工大学 | A kind of battery energy storage system for isolating symmetrical expression series connection circuit of reversed excitation |
| CN107769389B (en) * | 2017-10-24 | 2023-08-22 | 华南理工大学 | Battery energy storage system of isolation symmetrical series flyback circuit |
| US11088655B2 (en) * | 2018-01-31 | 2021-08-10 | Sungrow Power Supply Co., Ltd. | Photovoltaic solid-state transformer, photovoltaic inverter system and bidirectional high-voltage converter |
| CN110868075A (en) * | 2019-10-24 | 2020-03-06 | 北京机械设备研究所 | Bidirectional DC/DC converter and working method thereof |
| CN110868075B (en) * | 2019-10-24 | 2022-07-12 | 北京机械设备研究所 | Bidirectional DC/DC converter and working method thereof |
| CN115714549A (en) * | 2023-01-05 | 2023-02-24 | 湖南第一师范学院 | Bidirectional DC-AC converter |
| CN115714549B (en) * | 2023-01-05 | 2023-04-28 | 湖南第一师范学院 | Bidirectional DC-AC converter |
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