CN103762856B - A kind of transless hands over orthogonal cascade multilevel converter - Google Patents
A kind of transless hands over orthogonal cascade multilevel converter Download PDFInfo
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- CN103762856B CN103762856B CN201410013049.0A CN201410013049A CN103762856B CN 103762856 B CN103762856 B CN 103762856B CN 201410013049 A CN201410013049 A CN 201410013049A CN 103762856 B CN103762856 B CN 103762856B
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Abstract
The invention discloses a kind of transless and hand over orthogonal cascade multilevel converter, the terminal 2 of the power cell two of A, B, C three-phase links together, it is rectification side and the cascade of multiple power cell one on the left of power cell two, terminal 1 and 2 between the power cell one of above-mentioned cascade is connected with each other, the terminal 1 of outermost power cell one is connected with electrical network, and the terminal 2 of the power cell one of innermost layer is connected with the terminal 1 of power cell two rectification side；It is inverter side and the cascade of multiple power cell one on the right side of power cell two, terminal 1 and 2 between the power cell one of above-mentioned cascade is connected with each other, the terminal 1 of outermost power cell one is connected with load, and the terminal 2 of the power cell one of innermost layer is connected with the terminal 3 of power cell two inverter side.Present invention is mainly used for high-power occasion, energy two-way transmission can be realized when retaining cascade connection multi-level advantage, and be extended to more level easily, meet different electric pressure demand.
Description
Technical field
The present invention is a kind of multi-level converter suitable in high-power occasion, and can conveniently realize the transmitted in both directions of energy.
Background technology
In recent years, multi-level converter is the study hotspot of high-power occasion.The output of more level makes the output voltage of changer closer to sine, and the impact of load is also reduced, and can significantly reduce the switching loss of changer simultaneously.
The multi-level converter topology of current main flow has: diode clamp bit-type, striding capacitance type and cascade connection type three kinds.Diode clamp bit-type increases along with level number, and the quantity of clamp diode sharply increases, and striding capacitance type there is also the problem that electric capacity number increases severely, so both topologys are mainly used in many level topology application of below five level.
Traditional cascade multilevel converter adopts the mode of multiple low pressure and low power unit series connection to realize the output of high pressure.Cascade multi-level converter is the output realizing the many level of inverter side, need to adopt heavy multi-tap phase-shifting transformer to obtain and organize independent DC power supply more, and it is the transmitted in both directions realizing energy, need to survey in rectification to increase many power switch, the increase of these risings all causing changer cost and fault rate.Along with the raising of electric pressure, the tradition cascade multilevel converter defect at above two places is more obvious.Additionally, traditional cascade connection multi-level cannot realize the back-to-back connection in AC-DC-AC power changer, it is restricted in electric machine speed regulation applications.
Summary of the invention
For overcoming the technical problem of existing multi-level converter, the present invention proposes a kind of transless and hands over orthogonal cascade multilevel converter.This topology is when power cell device is solely subjected to this unit DC side low pressure, it is achieved the rectification of many level, inverter side output, and directly supports the back-to-back running of cascade multilevel converter.
Technical scheme is as follows:
A kind of transless hands over orthogonal cascade multilevel converter, the terminal 2 of the power cell two of A, B, C three-phase links together, it is rectification side and the cascade of multiple power cell one on the left of power cell two, terminal 1 and 2 between the power cell one of above-mentioned cascade is connected with each other, the terminal 1 of outermost power cell one is connected with electrical network, and the terminal 2 of the power cell one of innermost layer is connected with the terminal 1 of power cell two rectification side；It is inverter side and the cascade of multiple power cell one on the right side of power cell two, terminal 1 and 2 between the power cell one of above-mentioned cascade is connected with each other, the terminal 1 of outermost power cell one is connected with load, and the terminal 2 of the power cell one of innermost layer is connected with the terminal 3 of power cell two inverter side.
Described transless hands over orthogonal cascade multilevel converter, and described power cell one includes power switch S1, S2, S3, S4 and electric capacity, and the colelctor electrode of power switch S1 is connected with the positive pole of the colelctor electrode of power switch S3, electric capacity；The emitter stage of power switch S1 is connected with the colelctor electrode of power switch S2, simultaneously as the terminal 1 with external connection；The emitter stage of power switch S3 is connected with the colelctor electrode of power switch S4, simultaneously as the terminal 2 with external connection；The emitter stage of power switch S2 is connected with the emitter stage of power switch S4, is connected with the negative pole of electric capacity simultaneously.
Described transless hands over orthogonal cascade multilevel converter, and described power cell two includes power switch S5, S6, S7, S8, S9, S10 and electric capacity, and the colelctor electrode of power switch S5 is connected with the positive pole of the colelctor electrode of power switch S7, S9, electric capacity；The emitter stage of power switch S5 is connected with the colelctor electrode of power switch S6, simultaneously as the terminal 1 with external connection；The emitter stage of power switch S7 is connected with the colelctor electrode of power switch S8, simultaneously as the terminal 2 with external connection；The emitter stage of power switch S9 is connected with the colelctor electrode of power switch S10, simultaneously as the terminal 3 with external connection；The emitter stage of power switch S6 is connected with the emitter stage of power switch S8, S10, is connected with the negative pole of electric capacity simultaneously.
Described transless hands over orthogonal cascade multilevel converter, and described capacitance chooses the electric capacity being 5000 μ F, and all power switch all select the insulated gate bipolar transistor IGBT of 100A/1200V.
There is provided one to be prone to extend to more level, and the novel transless that can conveniently realize energy two-way transmission hands over orthogonal cascade multilevel converter topology.The design is easily achieved modularized design, it is simple to extension, required component number is less.
Accompanying drawing explanation
Fig. 1 one transless hands over orthogonal cascade multilevel converter topological diagram；
The structure chart of Fig. 2 power cell one；
The structure chart of Fig. 3 power cell two；
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.
Changer is the circuit structure of three-phase symmetrical, mainly includes power cell (1) and power cell (2).
As it is shown in figure 1, the terminal 2 of the power cell two of A, B, C three-phase links together, for the left side (be called rectification side afterwards, same, be called inverter side on the right side of power cell two) of power cell two.Terminal 1 and 2 between the different capacity unit one of multiple extensions is connected with each other, and the terminal 1 of outermost power cell one is connected with electrical network, and the terminal 2 of the power cell one of innermost layer is connected with the terminal 1 of power cell two；For inverter side, the terminal 1 and 2 between the different capacity unit one of multiple extensions is connected with each other, and the terminal 1 of outermost power cell one is connected with load, and the terminal 2 of the power cell one of innermost layer is connected with the terminal 3 of power cell two.
The output level number of changer can by increasing being extended property of the mode increase of power cell one.Extended mode is, the terminal 2 of the power cell two of A, B, C three-phase links together, and carries out symmetric extension as center.Left side (be called rectification side afterwards, same, be called inverter side on the right side of power cell two) for power cell two.Terminal 1 and 2 between the different capacity unit one of multiple extensions is connected with each other, and the terminal 1 of outermost power cell one is connected with electrical network, and the terminal 2 of the power cell one of innermost layer is connected with the terminal 1 of power cell two；For inverter side, the terminal 1 and 2 between the different capacity unit one of multiple extensions is connected with each other, and the terminal 1 of outermost power cell one is connected with load, and the terminal 2 of the power cell one of innermost layer is connected with the terminal 3 of power cell two.The power cell number of extension is determined according to the voltage level number of required output.
As shown in Figure 2 and Figure 3, the capacitance in figure chooses the electric capacity being 5000 μ F, and all power switch all select the insulated gate bipolar transistor (IGBT) of 100A/1200V.
Power cell one includes following assembly: power switch S1, S2, S3, S4 and electric capacity.The colelctor electrode of power switch S1 is connected with the positive pole of the colelctor electrode of power switch S3, electric capacity；The emitter stage of power switch S1 is connected with the colelctor electrode of power switch S2, simultaneously as the terminal 1 with external connection；The emitter stage of power switch S3 is connected with the colelctor electrode of power switch S4, simultaneously as the terminal 2 with external connection；The emitter stage of power switch S2 is connected with the emitter stage of power switch S4, is connected with the negative pole of electric capacity simultaneously.
Power cell two includes following assembly: power switch S5, S6, S7, S8, S9, S10 and electric capacity.The colelctor electrode of power switch S5 is connected with the positive pole of the colelctor electrode of power switch S7, S9, electric capacity；The emitter stage of power switch S5 is connected with the colelctor electrode of power switch S6, simultaneously as the terminal 1 with external connection；The emitter stage of power switch S7 is connected with the colelctor electrode of power switch S8, simultaneously as the terminal 2 with external connection；The emitter stage of power switch S9 is connected with the colelctor electrode of power switch S10, simultaneously as the terminal 3 with external connection；The emitter stage of power switch S6 is connected with the emitter stage of power switch S8, S10, is connected with the negative pole of electric capacity simultaneously.
The terminal 2 of the power cell two of A, B, C three-phase links together, and as center can according to electric pressure need carry out symmetric extension.For rectification side, the terminal 1 and 2 between the different capacity unit one of multiple extensions is connected with each other, outermost power cell with terminal 1 be connected with electrical network, the power cell of innermost layer with terminal 2 be connected with the terminal 1 of power cell two；For inverter side, the terminal 1 and 2 between the different capacity unit one of multiple extensions is connected with each other, and the terminal 1 of outermost power cell one is connected with load, and the terminal 2 of the power cell one of innermost layer is connected with the terminal 3 of power cell two.
The operation principle of this multi-level converter is:
First selected rectification side or inverter side are as priority acccess control side, then using opposite side as coordinating control side to be controlled.Owing to two kinds of selection modes become symmetrical relations, so being illustrated using rectification side as priority acccess control side below:
When being controlled using rectification side as priority acccess control side, power switch S1, S4 conducting in arbitrary power cell one, when S2, S3 turn off, this power cell output voltage is Vdc (Vdc is this power cell capacitance terminal voltage)；Power switch S1, S4 turn off, and during S2, S3 conducting, this power cell output voltage is-Vdc；When S1, S3 turn on, S2, S4 turn off or S1, S3 turn off, and during S2, S4 conducting, this power cell output voltage is 0.For power cell two, owing to rectification side is as priority acccess control side, so the control authority of S5, S6, S7, S8 transfers to rectification side, now have: power switch S5, S8 conducting in power cell two, when S6, S7 turn off, this power cell output voltage is Vdc (Vdc is this power cell capacitance terminal voltage)；Power switch S5, S8 turn off, and during S6, S7 conducting, this power cell output voltage is-Vdc；When S5, S7 turn on, S6, S8 turn off or S5, S7 turn off, and during S6, S8 conducting, this power cell output voltage is 0.Owing to each multiple power cells one of phase each in three-phase are to be connected in series one by one, it is connected with power cell two after connection, the level superposition exported by the power cell of these series connection, the voltage output of many level can be obtained on A, B, C port, and rectification side coordinates traditional cascade connection multi-level capacitor voltage balance method, the purpose that capacitor voltage balance controls can be reached.
For inverter side, owing to controlling side as coordinating, therefore must be operated in conjunction with the duty of rectification side.Specific practice is described below:
When the power cell two of rectification side exports Vdc, owing to S7 turns off, S8 turns on.The power cell two output voltage range of choice of inverter side is limited, then make S9 open-minded only, and S10 turns off output Vdc state；Or S9 turns off, and S10 is open-minded, exports 0 state, if need output-Vdc state in controlling, it is necessary to export by power cell one, such as undertaken power cell one controlling as follows: power switch S1, S4 turn off, and S2, S3 turn on.Same, other on off state is also similar.Now, inverter side power cell one, power cell two on off state must carry out Comprehensive Control, the port level that combination output is required in conjunction with the capacitance voltage in respective unit, the electric current that flows through.Such as, Vdc ,-Vdc state individually can be exported by power cell one or power cell two；And 0 state can be exported Vdc by power cell one, power cell two exports-Vdc and obtains, or is exported-Vdc by power cell one, and power cell two exports Vdc and obtains.As for adopting which kind of combination, the height of the current sense of current and capacitance voltage carry out comprehensive descision decision.
It should be appreciated that for those of ordinary skills, it is possible to improved according to the above description or converted, and all these are improved and convert the protection domain that all should belong to claims of the present invention.
Claims (3)
1. a transless hands over orthogonal cascade multilevel converter, it is characterized by: the terminal 2 of the power cell two of A, B, C three-phase links together, it it is rectification side on the left of power cell two, and described rectification side and the cascade of multiple power cell one, mutual cascade between the plurality of power cell one, and the terminal 1 and 2 between the power cell one of above-mentioned cascade is connected with each other, the terminal 1 of outermost power cell one is connected with electrical network, and the terminal 2 of the power cell one of innermost layer is connected with the terminal 1 of power cell two rectification side；It it is inverter side on the right side of power cell two, and described inverter side and the cascade of multiple power cell one, mutual cascade between the plurality of power cell one, terminal 1 and 2 between the power cell one of above-mentioned cascade is connected with each other, the terminal 1 of outermost power cell one is connected with load, and the terminal 2 of the power cell one of innermost layer is connected with the terminal 3 of power cell two inverter side；Described power cell two includes power switch S5, S6, S7, S8, S9, S10 and electric capacity, and the colelctor electrode of power switch S5 is connected with the positive pole of the colelctor electrode of power switch S7, S9, electric capacity；The emitter stage of power switch S5 is connected with the colelctor electrode of power switch S6, simultaneously as the terminal 1 with external connection；The emitter stage of power switch S7 is connected with the colelctor electrode of power switch S8, simultaneously as the terminal 2 with external connection；The emitter stage of power switch S9 is connected with the colelctor electrode of power switch S10, simultaneously as the terminal 3 with external connection；The emitter stage of power switch S6 is connected with the emitter stage of power switch S8, S10, is connected with the negative pole of electric capacity simultaneously.
2. transless according to claim 1 hands over orthogonal cascade multilevel converter, it is characterized in that: described power cell one includes power switch S1, S2, S3, S4 and electric capacity, and the colelctor electrode of power switch S1 is connected with the positive pole of the colelctor electrode of power switch S3, electric capacity；The emitter stage of power switch S1 is connected with the colelctor electrode of power switch S2, simultaneously as the terminal 1 with external connection；The emitter stage of power switch S3 is connected with the colelctor electrode of power switch S4, simultaneously as the terminal 2 with external connection；The emitter stage of power switch S2 is connected with the emitter stage of power switch S4, is connected with the negative pole of electric capacity simultaneously.
3. hand over orthogonal cascade multilevel converter according to the arbitrary described transless of claim 1-2, it is characterized in that: described electric capacity adopts electrochemical capacitor or thin-film capacitor, power switch adopts insulated gate bipolar transistor IGBT, integrated gate commutated thyristor IGCT or metal-oxide layer semiconductcor field effect transistor MOSFET.
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| CN104883072A (en) * | 2015-05-27 | 2015-09-02 | 中国矿业大学 | Transformerless ac-dc-ac cascade multilevel converter |
| US10218285B2 (en) | 2015-10-19 | 2019-02-26 | Siemens Aktiengesellschaft | Medium voltage hybrid multilevel converter and method for controlling a medium voltage hybrid multilevel converter |
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| CN101599708A (en) * | 2009-06-26 | 2009-12-09 | 华中科技大学 | The method for controlling power balance of DC side of cascaded multilevel inverter |
| CN101964596A (en) * | 2009-07-21 | 2011-02-02 | 株式会社日立制作所 | Power converter apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101599708A (en) * | 2009-06-26 | 2009-12-09 | 华中科技大学 | The method for controlling power balance of DC side of cascaded multilevel inverter |
| CN101964596A (en) * | 2009-07-21 | 2011-02-02 | 株式会社日立制作所 | Power converter apparatus |
Non-Patent Citations (1)
| Title |
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| 一种新型的无变压器级联型多电平变换器拓扑;王奎等;《电工技术学报》;20110831;第26卷(第8期);第1-6页 * |
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