CN114070111A - Multiplexing bridge arm selection type MMC topological structure - Google Patents
Multiplexing bridge arm selection type MMC topological structure Download PDFInfo
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- CN114070111A CN114070111A CN202111405164.9A CN202111405164A CN114070111A CN 114070111 A CN114070111 A CN 114070111A CN 202111405164 A CN202111405164 A CN 202111405164A CN 114070111 A CN114070111 A CN 114070111A
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- 230000000295 complement effect Effects 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
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- 238000000034 method Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
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- Engineering & Computer Science (AREA)
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- Inverter Devices (AREA)
Abstract
The invention discloses a multiplexing bridge arm selection type MMC topological structure, belonging to the technical field of power systems; the MMC topological structure comprises a three-phase bridge arm circuit and a three-phase filter inductor; each phase of bridge arm circuit comprises an upper bridge arm circuit, a lower bridge arm circuit, a multiplexing bridge arm circuit and first to fourth bridge arm selection switch strings; the upper bridge arm circuit of any phase is connected with a first bridge arm selection switch string, one end of the first bridge arm selection switch string, which is commonly connected with the third bridge arm selection switch string, is connected with the upper end of a multiplexing bridge arm circuit, one end of the second bridge arm selection switch string, which is commonly connected with the fourth bridge arm selection switch string, is connected with the upper end of a lower bridge arm circuit, the middle point of the second bridge arm selection switch string, which is connected with the third bridge arm selection switch string, is connected with an alternating current side filter inductor, the upper end of the upper bridge arm circuit is connected with the positive pole of a direct current port, and the lower end of the lower bridge arm circuit is connected with the negative pole of the direct current port. Compared with the traditional MMC structure, the topological structure has stable direct-current side voltage, and the multiplexing bridge arm circuit is designed, so that about 1/2 submodules can be saved to the maximum extent, and the power density of the MMC is improved.
Description
Technical Field
The invention relates to a multiplexing bridge arm selection type MMC topology structure, belongs to the technical field of power systems, and particularly relates to an MMC topology with few sub-modules.
Background
In recent years, as Modular Multilevel Converters (MMC) have the advantages of high waveform quality, low running loss, high integration degree and the like, the MMC is widely applied to the field of flexible direct current power transmission and distribution. However, in practical application, the MMC needs a large number of semiconductor devices and capacitors, which leads to the problems of high conversion cost, large floor area, low power density and the like. Aiming at the MMC topologies of other different basic forms at present, one MMC structure is a hybrid cascade type, the MMC structure comprises a shaping circuit and a bridge type switch circuit, the shaping circuit is cascaded with a large number of full-bridge type submodules, the number of power semiconductor devices is increased, and meanwhile, the bridge type switch has large bearing pressure and needs a large number of power switch devices. The other is a bridge arm selection type MMC structure, the topological structure works in a specific voltage ratio of alternating current side voltage to direct current port voltage, and the flexibility of a voltage input and output range is poor. In addition, the three-phase serial MMC researched at present needs to be connected with a transformer at the AC side of the MMC topology, so that the size of the MMC is increased. Therefore, how to improve the operation problem of the existing MMC, adjusting the control mode, ensuring that the number of the sub-modules required under the power conversion of the same level is reduced, improving the power density of the MMC, reducing the operation cost and reducing the occupied area become a technical problem to be solved urgently.
Disclosure of Invention
In order to solve the technical problems, the invention adopts the following technical scheme:
a multiplexing bridge arm selection type MMC topological structure is composed of a three-phase bridge arm circuit and a three-phase filter inductor; each phase of bridge arm circuit comprises an upper bridge arm circuit, a lower bridge arm circuit, a multiplexing bridge arm circuit and first to fourth bridge arm selection switch strings;
furthermore, the lower end of the upper bridge arm circuit of any phase is connected with one end of a first bridge arm selection switch string, and the other end of the first bridge arm selection switch string and a third bridge arm selection switch string are connected with the upper end of the multiplexing bridge arm circuit together; the other end of the third bridge arm selection switch string and one end of the second bridge arm selection switch string are connected together and connected with an alternating-current side filter inductor; the other end of the second bridge arm selection switch and one end of the fourth bridge arm selection switch string are connected together and connected with the lower end of the multiplexing bridge arm; the upper end of the lower bridge arm circuit of any phase is connected with the other end of the fourth bridge arm selection switch string, and the lower end of the lower bridge arm circuit is connected with the negative electrode of the direct current port; the upper end of the upper bridge arm circuit of any phase is connected with the positive electrode of the direct current port;
the number of the upper and lower bridge arm circuit sub-modules of any phase is configured equally;
furthermore, the upper bridge arm submodule, the lower bridge arm submodule and the multiplexing bridge arm submodule of any phase can be half-bridge, full-bridge or mixed type submodules;
the first bridge arm selection switch string and the second bridge arm selection switch string of any phase are simultaneously switched on and off, and the third bridge arm selection switch and the fourth bridge arm selection switch string are simultaneously switched on and off;
further, the first bridge arm selection switch string, the second bridge arm selection switch string, the third bridge arm selection switch string and the fourth bridge arm selection switch string are in complementary conduction operation;
further, the first bridge arm selection switch string, the second bridge arm selection switch string, the third bridge arm selection switch string and the fourth bridge arm selection switch string can be series-connected semiconductor devices, mechanical high-voltage switches or switches in a combined form;
when the first bridge arm selection switch string and the fourth bridge arm selection switch string of any phase are conducted, the upper bridge arm circuit and the multiplexing bridge arm circuit are put into use, and the upper bridge arm circuit and the multiplexing bridge arm circuit generate total voltage which is superposed with half of the voltage on the alternating current side and equal to the voltage on the direct current side, so that the upper bridge arm circuit and the multiplexing bridge arm circuit work in the positive half period of the phase; when any phase of the second bridge arm selection switch string and the third bridge arm selection switch string are conducted, the lower bridge arm circuit and the multiplexing bridge arm circuit are put into use, the lower bridge arm circuit and the multiplexing bridge arm circuit generate total voltage which is superposed with half of the voltage on the alternating current side and is equal to the voltage on the direct current side, and the phase works in a negative half period;
further, the multiplexing bridge arm selection type MMC topology realizes power balance in positive and negative half periods by setting a power balance angle;
the multiplexing bridge arm selection type MMC topology allows a wider voltage input and output range; when the MMC topology works, the bridge arm selection switch is in power frequency switching, no loop current exists between bridge arms, and bridge arm filter inductance is eliminated. Meanwhile, the use number of the MMC topology sub-modules is reduced by adding the multiplexing bridge arms, so that the cost and the volume of the MMC are reduced, and the power density of the MMC is improved.
Drawings
Fig. 1 is a multiplexing bridge arm selection type MMC topology diagram of embodiment 1;
FIG. 2 is a diagram illustrating the power balance of a multiplexing bridge arm selection type MMC in example 1;
fig. 3 is a basic control manner of the multiplexing bridge arm selection type MMC in embodiment 1;
fig. 4 is a voltage simulation waveform of a multiplexing bridge arm selection type MMC sub-module in embodiment 1;
FIG. 5 is a least sub-module multiplexing bridge arm selection type MMC topology diagram of embodiment 2;
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
Example 1:
as shown in fig. 1, for the multiplexing bridge arm selection type MMC topology structure provided in the present invention, a multiplexing bridge arm selection type MMC topology structure is composed of a three-phase bridge arm circuit, a three-phase filter inductor, and a dc side capacitor; any phase bridge arm circuit comprises an upper bridge arm circuit armiuLower bridge arm circuit armilMultiplex bridge arm circuit armimFirst bridge arm selection switch string Ti1And a second bridge arm selection switch string Ti2And a third bridge arm selection switch string Ti3And a fourth bridge arm selection switch string Ti4(ii) a Wherein i denotes the a, b, c phase.
Taking phase a as an example, the upper bridge arm circuit armauLower bridge arm circuit armalAnd multiplexing bridge arm circuit armamThe sub-module adopts a half-bridge type sub-module, and the first bridge arm selects the switch string Ti1And a second bridge arm selection switch string Ti2And a third bridge arm selection switch string Ti3And a fourth bridge arm selection switch string Ti4A string connected with the IGBT pair transistors which are switched on and off is adopted. armauLower end is connected with Ta1One end, Ta1The other end and Ta3One end is connected with and connected with armamAn upper end; t isa3The other end and Ta2One end is connected together and connectedAC side filter inductora；Ta2The other end and Ta4One end is connected with and connected with armamA lower end; armalUpper end connecting Ta4The other end, armalThe lower end is connected with the negative electrode of the direct current port; armauThe upper end is connected with the positive pole of the direct current port.
In example 1, arm is assumedauSub-modules are n, armalNumber of submodules n, armamThe number of the submodules is m, the number of the submodules of the traditional MMC single-bridge arm is N, and then m + N is N; correspondingly, the premise of stable operation of the MMC topology is sub-module voltage balance, and a description of the power balance of the sub-modules suitable for the MMC topology is shown in FIG. 2. Designing a power factor angle alpha during the charging and discharging processes of the upper bridge arm submodule, the lower bridge arm submodule and the multiplexing bridge arm submodule in a half period, so that the power factor angle alpha is enabled to be t1-t2Charging the upper bridge arm submodule and the multiplexing bridge arm submodule within time and charging energy wa_CTo modulate the voltage uarmau_C+uarmam_C(e.g. light grey portion) and a simultaneous internal current iau_C(e.g., light gray portion) integral of the product; at t2-t4The upper bridge arm sub-module and the multiplexing bridge arm sub-module are discharged, and the discharge energy wa_RTo modulate the voltage uarmau_C+uarmam_R(e.g. dark grey part) and a simultaneous internal current iau_R(e.g. dark grey part) integral of the product, wa_CSuperposition of wa_RAnd if the voltage is zero, the half period of the upper bridge arm submodule and the multiplexing bridge arm submodule is illustrated to realize voltage balance.
The basic control principle and meaning of each name of a curve of the multiplexing bridge arm selection type MMC topology are described with reference to FIG. 3. At t1-t4，Ta1And Ta2Conducting, upper armauAnd multiplexing bridge armamIs folded out
Working for a positive half period; at t4-t6，Ta3And Ta4Conducting, upper armalAnd multiplexing bridge armamIs folded out
The device works in a negative half period, wherein omega is the power frequency angular frequency,
is the initial phase of phase a. Suppose the sub-module capacitor voltage is vcHaving a value of (m + n) × vc＝udcIn the positive half cycle, make the lower bridge armalSubmodule superposition voltage nxvcThen T isa4Maximum bearing pressure during switching is
Ta3Maximum bearing u during switchingarmam＝k×vc(k is arm at handoveramThe number of input submodules); similarly, in the negative half cycle, Ta1Maximum bearing and T during switchinga4Same, Ta2Maximum bearing and T during switchinga3The same is true. Under the control mode, making m equal to n, and obtaining the average voltage v of the three-phase sub-modules through simulationa_sm、vb_sm、vc_smAs shown in fig. 4. In the case of m ═ N, 6 bridge arms total 6N compared with the N sub-modules of the traditional MMC single bridge arm, and the number of the sub-modules is reduced by 1/4 compared with the number of the traditional MMC sub-modules when the topology uses 4.5N at most.
Example 2:
fig. 5 shows a least-sub-module multiplexing bridge arm selection type MMC topology, which cancels the upper and lower bridge arms, i.e., makes m equal to n equal to 0, and multiplexes bridge arms arm by using the power balance principle and control method in embodiment 1amTime division multiplexing is carried out in positive and negative half cycles, and the voltage of the submodules is balanced. In this case, the arm is multiplexedamThe submodule number is N for m, three multiplexing bridge arm totally 3N submodule, compares traditional MMC's 6N submodule, and 1/2 can be saved to this topology, has saved submodule quantity greatly, and the cost is reduced has reduced MMC device volume, has promoted power density.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (7)
1. A multiplexing bridge arm selection type MMC topological structure is characterized in that the topological structure comprises an M three-phase bridge arm circuit and a three-phase filter inductor;
any phase of the three-phase bridge arm circuit comprises an upper bridge arm circuit, a lower bridge arm circuit, a multiplexing bridge arm circuit, a first bridge arm selection switch, a second bridge arm selection switch, a third bridge arm selection switch and a fourth bridge arm selection switch;
the upper bridge arm circuit of any phase of the three-phase bridge arm circuit is connected with a first bridge arm selection switch, one end of the first bridge arm selection switch, which is commonly connected with a third bridge arm selection switch, is connected with the upper end of the multiplexing bridge arm circuit, the second bridge arm selection switch and a fourth bridge arm selection switch are connected in series and are connected with the upper end of the lower bridge arm circuit, the middle point of the second bridge arm selection switch, which is serially connected with the third bridge arm selection switch, is connected with an alternating current side filter inductor, the upper end of the upper bridge arm circuit is connected with a direct current port anode, and the lower end of the lower bridge arm circuit is connected with a direct current port cathode.
2. The MMC topology structure of claim 1, wherein the lower end of the upper bridge arm circuit of any phase of the three-phase bridge arm circuit is connected to one end of a first bridge arm selection switch, and the other end of the first bridge arm selection switch and a third bridge arm selection switch string are connected together and connected to the upper end of the multiplexing bridge arm circuit; the other end of the third bridge arm selection switch string and one end of the second bridge arm selection switch string are connected together and connected with an alternating-current side filter inductor; the other end of the second bridge arm selection switch and one end of the fourth bridge arm selection switch string are connected together and connected with the lower end of the multiplexing bridge arm;
the upper end of a lower bridge arm circuit of any phase of the three-phase bridge arm circuit is connected with the other end of the fourth bridge arm selection switch string, and the lower end of the lower bridge arm circuit is connected with the negative electrode of the direct current port;
the upper end of the upper bridge arm circuit of any phase of the three-phase bridge arm circuit is connected with the positive electrode of the direct current port.
3. The MMC topology structure of claim 1, wherein the number of submodules of the upper bridge arm circuit and the lower bridge arm circuit of any phase of the three-phase bridge arm circuit is equal.
4. The MMC topology structure of claim 1, wherein any phase of the upper bridge arm submodule, the lower bridge arm submodule and the multiplexing bridge arm submodule of the three-phase bridge arm circuit can be a half-bridge submodule, a full-bridge submodule or a hybrid submodule.
5. The MMC topology structure of claim 1, wherein a first bridge arm selection switch string and a second bridge arm selection switch string of any phase of the three-phase bridge arm circuit are simultaneously turned on and off, and a third bridge arm selection switch and a fourth bridge arm selection switch string are simultaneously turned on and off;
and the first bridge arm selection switch string, the second bridge arm selection switch string, the third bridge arm selection switch string and the fourth bridge arm selection switch string are in complementary conduction operation.
6. The MMC topology structure of claim 1, wherein the first bridge arm selection switch string, the second bridge arm selection switch string, the third bridge arm selection switch string and the fourth bridge arm selection switch string are selected from one or more of series-connected semiconductor devices and mechanical high-voltage switches.
7. The MMC topology structure of claim 1, wherein when any phase of the first bridge arm selection switch string and the second bridge arm selection switch string of the three-phase bridge arm circuit are conducted, the upper bridge arm circuit and the multiplexing bridge arm circuit are put into use, the upper bridge arm circuit and the multiplexing bridge arm circuit generate total voltage to be superposed with half of the voltage on the AC side, and the total voltage is used for working in the positive half period of the phase of the three-phase bridge arm circuit;
when any phase of a third bridge arm selection switch string and a fourth bridge arm selection switch string of the three-phase bridge arm circuit are conducted, the lower bridge arm circuit and the multiplexing bridge arm circuit are put into use, and the lower bridge arm circuit and the multiplexing bridge arm circuit generate total voltage which is superposed with half of the voltage on the alternating current side and is used for working in the negative half period of the phase of the three-phase bridge arm circuit;
the multiplexing bridge arm selection type MMC topology realizes power balance in positive and negative half cycles by setting a power balance angle.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114665733A (en) * | 2022-05-24 | 2022-06-24 | 华北电力大学（保定） | Multiplex bridge arm alternately-conducted multi-level converter and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113595424A (en) * | 2021-08-10 | 2021-11-02 | 东南大学 | Bridge arm multiplexing MMC topological structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113595424A (en) * | 2021-08-10 | 2021-11-02 | 东南大学 | Bridge arm multiplexing MMC topological structure |
Non-Patent Citations (1)
| Title |
|---|
| THANH HAI NGUYEN等: "An Efficient Topology of Modular-Multilevel Converter with Alternative Arm Operation", 《 IECON 2018 - 44TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY》, pages 3915 - 3920 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114665733A (en) * | 2022-05-24 | 2022-06-24 | 华北电力大学（保定） | Multiplex bridge arm alternately-conducted multi-level converter and control method thereof |
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