CN110649833A - MMC topological structure with interphase bidirectional self-voltage-sharing capability - Google Patents

MMC topological structure with interphase bidirectional self-voltage-sharing capability Download PDF

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CN110649833A
CN110649833A CN201910825587.2A CN201910825587A CN110649833A CN 110649833 A CN110649833 A CN 110649833A CN 201910825587 A CN201910825587 A CN 201910825587A CN 110649833 A CN110649833 A CN 110649833A
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bridge arm
sub
module
voltage
sharing
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束洪春
雷顺广
刘佳露
田鑫萃
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Kunming University of Science and Technology
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Kunming University of Science and Technology
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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
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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
    • H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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
    • 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
    • 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
    • H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage

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  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention relates to an MMC topological structure with an interphase bidirectional self-voltage-sharing capability, belonging to the technical field of flexible direct-current transmission. The invention consists of A, B, C three-phase circuits, wherein each phase circuit comprises an upper bridge arm, a lower bridge arm and two bridge arm inductors, and each bridge arm comprises N sub-modules; the voltage-sharing circuit and the voltage-sharing circuit are different between the single-phase circuit and the adjacent two-phase circuit, the voltage-sharing in the single phase is realized by forming the voltage-sharing circuit between the adjacent sub-modules by using diodes, the voltage-sharing between phases is realized by using IGBTs and inductors between the adjacent phases, and the whole bidirectional self-voltage-sharing MMC topology comprises 6N +4 IGBT modules and 3N-3 diodes. The invention can finish voltage sharing among the sub-module capacitors through the self topological structure characteristic and has the characteristics of high efficiency and high speed.

Description

MMC topological structure with interphase bidirectional self-voltage-sharing capability
Technical Field
The invention relates to an MMC topological structure with an interphase bidirectional self-voltage-sharing capability, belonging to the technical field of flexible direct-current transmission.
Background
The modular multilevel converter has the advantages of easy expansion, good output waveform quality, comprehensive fault protection, strong recovery capability, low loss, strong unbalanced operation capability and the like by virtue of the modular structure, and is widely applied to the field of high-voltage direct-current transmission. Although MMCs have several advantages, they also face problems arising from unique structures, such as voltage grading problems and circulating current suppression problems. The direct current side of the MMC is formed by connecting a plurality of independent capacitors in series, and different levels are output by controlling the number of input and cut-off sub-modules. In the process of commutation, in order to restrain circulation current, reduce loss and reduce the harmonic content of an output waveform, the voltage between capacitors of each submodule needs to be kept in periodic balance.
At present, a main solution to the MMC voltage sharing problem is to adopt a voltage sharing control algorithm and sort the voltages of MMC sub-modules. The voltage-sharing control algorithm is firstly used for sampling the capacitance voltage of all the sub-modules, a large number of sensors and high-sampling-rate devices are required to support, and when the level number of the MMC is increased, the complexity of the voltage-sharing algorithm is multiplied, so that the control difficulty is increased sharply, and the application of voltage sharing of the control algorithm to the large-capacity MMC is limited.
Disclosure of Invention
The invention provides an MMC topological structure with an interphase bidirectional self-voltage-sharing capability, which is used for solving the problems.
The technical scheme of the invention is as follows: an MMC topological structure with interphase bidirectional self-voltage-sharing capability comprises A, B, C three-phase circuits, wherein each phase circuit comprises an upper bridge arm, a lower bridge arm and two bridge arm inductors, and each bridge arm comprises N sub-modules; the voltage-sharing circuit and the voltage-sharing circuit are different between the single-phase circuit and the adjacent two-phase circuit, the voltage-sharing in the single phase is realized by forming the voltage-sharing circuit between the adjacent sub-modules by using diodes, the voltage-sharing between phases is realized by using IGBTs and inductors between the adjacent phases, and the whole bidirectional self-voltage-sharing MMC topology comprises 6N +4 IGBT modules and 3N-3 diodes.
A. The C two-phase circuit adopts the same topology, the B phase circuit topology is different from the A, C two phases, and the connection mode of the A, C two-phase circuit is as follows: the upper input end of the 1 st sub-module of the upper bridge arm is connected with the positive electrode of the direct current side, the lower input end is connected with the upper input end of the 2 nd sub-module of the upper bridge arm, the voltage-sharing branch is connected with the positive electrode of the capacitor of the 2 nd sub-module of the upper bridge arm, the upper input end of the 2 nd sub-module of the upper bridge arm is connected with the lower input end of the 1 st sub-module of the upper bridge arm, the lower input end of the 2 nd sub-module of the upper bridge arm is connected with the upper input end of the 3 rd sub-module of the upper bridge arm, the voltage-sharing branch is connected with the positive electrode of the capacitor of the 3 rd sub-module of the upper bridge arm, the upper input end of the i-1 th sub-module of the upper bridge arm is connected with the lower input end of the i +1 th sub-module of the upper bridge arm, the upper input end of the N-, the lower input end of the sub-module of the I < th > sub-module of the lower bridge arm is connected with the lower input end of the sub-module of the i < th > sub-module of the lower bridge arm, the reactor of the upper bridge arm is connected with the reactor of the lower bridge arm in series, a voltage-sharing branch is connected with the positive electrode of the capacitor of the sub-module of the 1 < th > sub-module of the lower bridge arm, the upper input end of the sub-module of the 2 < th > sub-module of the lower bridge arm is connected with the lower input end of the sub-module of the 1 < th > sub-module of the lower bridge arm, the lower input end of the sub-module of the 3 < rd > sub-module of the lower bridge arm, the voltage-sharing branch is connected with the positive electrode of the capacitor of the sub-module of the 3 < rd > sub-module of the lower bridge arm, the upper input end of the sub-module of the i < th > 1, the upper input end of the Nth sub-module of the lower bridge arm is connected with the lower input end of the (N-1) th sub-module of the lower bridge arm, and the lower output end of the Nth sub-module of the lower bridge arm is connected with the negative electrode of the direct current side. A. B, C the last submodule of the three-phase circuit is a traditional submodule without adding a voltage-sharing branch.
The voltage-sharing between the adjacent two-phase circuits is different from the voltage-sharing structure adopted in the single-phase circuit, the interphase bidirectional self-voltage-sharing only exists in the first submodule of the upper bridge arm and the last submodule of the lower bridge arm of each phase, and the connection mode between the 1 st submodule of the upper bridge arm of the A, B two-phase circuit is as follows: the negative electrode of the capacitor of the first submodule of the A-phase circuit voltage-sharing loop is connected with the collector of an IGBT, the emitter of the IGBT is connected with the lower output end of the first submodule of the upper bridge arm of the B-phase circuit, the connection mode of the 1 st submodule of the upper bridge arm of the B, C two-phase circuit is the same as that of the 1 st submodule of the upper bridge arm of the A, B two-phase circuit, and the connection mode of the Nth submodule of the lower bridge arm of the A, B two-phase circuit is as follows: the positive electrode of the capacitor of the Nth sub-module of the lower bridge arm of the A-phase circuit is connected with the collector of the IGBT, the emitter of the IGBT is connected with the upper input end of the Nth sub-module of the lower bridge arm of the B-phase circuit, and the connection mode of the Nth sub-module of the lower bridge arm of the B, C two-phase circuit is the same as that of the Nth sub-module of the lower bridge arm of the A, B two-phase circuit.
A. B, C the directions of the IGBTs between the three-phase circuits can be reversed. Take A, B two-phase circuit as an example: the bridge arm on the A phase is connected with the collector of the IGBT, the bridge arm on the B phase is connected with the emitter of the IGBT, and the bridge arm on the A phase is connected with the emitter of the IGBT and the bridge arm on the B phase is connected with the collector of the IGBT.
The invention has the beneficial effects that: interphase two-way from voltage-sharing MMC topological structure can realize the voltage-sharing certainly between the submodule piece electric capacity according to the topological structure characteristics of self, has abandoned the voltage-sharing control algorithm completely, when the MMC level number rose, can not increase the complexity that realizes the system, can utilize the high voltage direct current flexonics transmission field of high-voltage large capacity well.
Drawings
FIG. 1 is a sub-module topology of the present invention;
FIG. 2 is an overall topology of the present invention;
fig. 3 is a schematic diagram of the voltage sharing of the present invention.
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
Fig. 1(a) is a sub-module topology structure of an a-phase circuit and a C-phase circuit, and fig. 1(B) is a sub-module topology structure of a B-phase circuit, both of which are formed by adding a diode on the basis of a traditional MMC sub-module. Fig. 1(c) is a connection submodule of an upper bridge arm circuit of the MMC, and fig. 1(d) is a connection submodule of a lower bridge arm circuit of the MMC, wherein an IGBT and an inductor are added on the basis of a traditional MMC submodule to serve as a voltage-sharing circuit.
Fig. 2 is an interphase bidirectional self-voltage-sharing MMC topology, which is composed of A, B, C three-phase circuits. Each phase circuit comprises an upper bridge arm and a lower bridge arm, and each bridge arm consists of N sub-modules. Two bridge arm inductors are arranged between an upper bridge arm and a lower bridge arm of the A, B, C three-phase circuit; and a bidirectional voltage-sharing loop is arranged between the adjacent two-phase circuits. The whole interphase bidirectional self-voltage-sharing MMC topology comprises (6N +4) IGBT modules and (6N-3) diodes.
A. The C two-phase circuit uses the same topology, and the B phase circuit topology is different from the A, C two phases. A. The connection modes of the C two-phase circuit are as follows: the upper input end of the 1 st sub-module of the upper bridge arm is connected with the positive electrode of the direct current side, the lower input end of the 1 st sub-module of the upper bridge arm is connected with the upper input end of the 2 nd sub-module of the upper bridge arm, the voltage-sharing branch is connected with the positive electrode of the capacitor of the 2 nd sub-module of the upper bridge arm, the upper input end of the 2 nd sub-module of the upper bridge arm is connected with the lower input end of the 1 st sub-module of the upper bridge arm, the lower input end of the 2 nd sub-module of the upper bridge arm is connected with the upper input end. The upper input end of the ith sub-module of the upper bridge arm is connected with the lower input end of the (i-1) th sub-module of the upper bridge arm, the lower input end of the ith sub-module of the upper bridge arm is connected with the upper input end of the (i +1) th sub-module of the upper bridge arm, and the voltage-sharing branch is connected to the positive electrode of the capacitor of the (i +1) th sub-module of the upper bridge. The upper input end of the Nth sub-module of the upper bridge arm is connected with the lower input end of the (N-1) th sub-module of the upper bridge arm, the lower input end is connected with an upper bridge arm reactor, the reactor of the upper bridge arm is connected with the reactor of the lower bridge arm in series, and the voltage-sharing branch is connected to the positive electrode of the capacitor of the 1 st sub-module of the lower bridge arm. The upper input end of the 1 st sub-module of the lower bridge arm is connected with the reactor of the lower bridge arm, the lower input end of the 1 st sub-module of the lower bridge arm is connected with the upper input end of the 2 nd sub-module of the lower bridge arm, and the voltage-sharing branch is connected with the positive electrode of the capacitor of the 2 nd sub-module of the lower bridge arm. The upper input end of the 2 nd sub-module of the lower bridge arm is connected with the lower input end of the 1 st sub-module of the lower bridge arm, the lower input end of the 2 nd sub-module of the lower bridge arm is connected with the upper input end of the 3 rd sub-module of the lower bridge arm, and the voltage-sharing branch is connected with the positive electrode of the capacitor of the 3 rd sub-module of the lower bridge arm. The upper input end of the ith sub-module of the lower bridge arm is connected with the lower input end of the (i-1) th sub-module of the lower bridge arm, the lower input end of the ith sub-module of the lower bridge arm is connected with the upper input end of the (i +1) th sub-module of the lower bridge arm, and the voltage-sharing branch is connected to the positive electrode of the capacitor of the (i +1) th sub-module of the lower bridge arm. The upper input end of the Nth sub-module of the lower bridge arm is connected with the lower input end of the (N-1) th sub-module of the lower bridge arm, and the lower output end of the Nth sub-module of the lower bridge arm is connected with the negative electrode of the direct current side. A. B, C the last submodule of the three-phase circuit is a traditional submodule without adding a voltage-sharing branch.
The voltage-sharing structure adopted in the voltage-sharing structure is different between the two adjacent phases of circuits and the voltage-sharing structure adopted in the single-phase circuit, and the interphase bidirectional self-voltage-sharing structure only exists in the first submodule of the upper bridge arm and the last submodule of the lower bridge arm of each phase. A. The connection mode between the 1 st sub-modules of the upper bridge arm of the B two-phase circuit is as follows: the negative electrode of the capacitor of the first submodule of the A-phase circuit voltage-sharing loop is connected with the collector of the IGBT, and the emitter of the IGBT is connected with the lower output end of the first submodule of the upper bridge arm of the B-phase circuit. B. The connection mode of the 1 st sub-module of the upper bridge arm of the C two-phase circuit is the same as that of the 1 st sub-module of the upper bridge arm of the A, B two-phase circuit. A. The connection mode between the Nth sub-modules of the lower bridge arm of the B two-phase circuit is as follows: the positive electrode of the capacitor of the Nth sub-module of the lower bridge arm of the A-phase circuit is connected with the collector of the IGBT, and the emitter of the IGBT is connected with the upper input end of the Nth sub-module of the lower bridge arm of the B-phase circuit. B. The connection mode of the Nth sub-module of the lower bridge arm of the C two-phase circuit is the same as that of the Nth sub-module of the lower bridge arm of the A, B two-phase circuit.
Fig. 3 is a schematic diagram of an inter-phase bidirectional self-voltage-sharing MMC topology, and the inter-phase bidirectional self-voltage-sharing steps are as follows:
1) step a, electric energy is transmitted in the phase A submodule. FIG. 3(a) neutron module capacitance CA1And submodule capacitor CA2Diode D capable of passing through voltage-sharing loopA1An energy path is formed. Energy slave submodule capacitor CA2Anode passing through diode DA1Flow direction capacitance CA1Then passes through T4Back to sub-module capacitance CA2The negative electrode of (1). Energy is transmitted between the submodule capacitor CA1 and the submodule capacitor CA1 through a voltage equalizing loop, and the voltages of the submodule capacitor CA1 and the submodule capacitor CA1 meet the following requirements in a dynamic process:
UCA1≥UCA2 (1)
adjacent submodules in the A-phase bridge arm are connected by adopting a formula (a) shown in a figure 3, and the voltage dynamics of each submodule meets the following conditions:
UCA1≥UCA2≥…≥UCAn≥…≥UCA(n+i)≥UCA2n (2)
2) step b, energy is transferred between A, B two phases, as shown in fig. 3 (b). Capacitor C of current sub-moduleA1Is greater thanModule capacitor CB1At voltage, energy passes through the voltage-sharing loop from CA1Steering capacitor CB1. Energy slave capacitor CA1Positive electrode of (2) passes through T1And a diode D3Flow direction capacitance CB1Then through an inductor LabAnd a diode DabBack to the capacitance CA1The negative electrode of (1). Energy passes through a voltage-sharing loop and is in a sub-module capacitor CA1And submodule capacitor CB1The voltage of the two is satisfied in the dynamic process:
UCA1≤UCA2 (3)
capacitor C of current sub-moduleB1Is higher than the sub-module capacitor CA1At voltage, energy passes through the voltage-sharing loop from CB1Steering capacitor CA1. Energy slave capacitor CB1Positive electrode of (2) passes through T3And a diode D1Flow direction capacitance CA1Then passes through TabAnd an inductance LabBack to the capacitance CB1The negative electrode of (1). Submodule capacitor CA1And submodule capacitor CB1Through the transmission of voltage-sharing loop energy, the two voltages meet the following requirements in the dynamic process:
UCA1≥UCA2 (4)
the physical meaning of formula (3) can be described as: capacitor CA1Is always in the state of making the capacitor CB1A voltage greater than or equal to the self voltage. The physical meaning of formula (4) can be described as: capacitor CB1 is always in the state that capacitor C is enabledA1A voltage greater than or equal to the self voltage. The two interact with each other, so that energy is mutually transmitted between the two, bidirectional voltage sharing between A, B two phases is realized, and finally, a capacitor C is achievedA1And CB1Voltage dynamic balancing, namely:
UCA1＝UCB1 (5)
3) and step c, energy is transmitted in the B-phase submodule. FIG. 3(C) neutron module capacitance CB1And submodule capacitor CB2Diode D capable of passing through voltage-sharing loopB1An energy path is formed. Energy slave submodule capacitor CB1Anode passing through diode DB1Flow direction capacitance CB2Then passes through a diode DB4Back to sub-module capacitance CB1And a negative electrode. Submodule capacitor CB1And submodule capacitor CB2Through the transmission of voltage-sharing loop energy, the two voltages meet the following requirements in the dynamic process:
UCB1≤UCB2 (6)
adjacent submodules in the B-phase bridge arm are connected by adopting a formula (c) shown in a figure 3, and the voltage dynamics of each submodule meets the following conditions:
UCB1≤UCB2≤…≤UCBn≤…≤UCB(n+i)≤UCB2n (7)
4) step d, energy is transferred between A, B two phases, as shown in FIG. 3 (d). Capacitor C of current sub-moduleB2nIs higher than the sub-module capacitor CA2nWhile energy is transferred from C through the voltage-sharing circuitB2nSteering capacitor CA2n. Energy slave capacitor CB2nPositive electrode of (2) passes through T3Diode DabAnd T1Flow direction capacitance CA2nAnd then flows back to the capacitor CB2nThe negative electrode of (1). Submodule capacitor CA2nAnd submodule capacitor CB2nThrough the transmission of voltage-sharing loop energy, the two voltages meet the following requirements in the dynamic process:
UCA2n≥UCB2n (8)
capacitor C of current sub-moduleA2nIs higher than the sub-module capacitor CB2nAt voltage of (C), energy passes through the voltage-sharing loop from CA2nSteering capacitor CB2n. Energy from CA2nPositive electrode of (2) passes through T1、TabInductor LabAnd a diode D3Flow direction capacitance CB2nThen flows back to the capacitor CA2nThe negative electrode of (1). Submodule capacitor CA2nAnd submodule capacitor CB2nThrough the transmission of voltage-sharing loop energy, the two voltages meet the following requirements in the dynamic process:
UCA2n≤UCB2n (9)
the physical meaning of formula (8) can be described as: capacitor CB2nIs always inMake the capacitor CA2nThe trend of the voltage greater than or equal to the self voltage, the physical meaning of equation (9) can be described as: capacitor CA2nIs always in the state of making the capacitor CB2nA voltage greater than or equal to the self voltage. The two interact with each other, so that the energy difference is mutually transmitted between the two, the bidirectional voltage sharing between A, B two phases is realized, and finally the capacitor C is achievedA2nAnd CB2nVoltage dynamic balancing, i.e.,;
UCA2n＝UCB2n (10)
this is obtained by the formulae (1) to (10):
UCA1≥UCA2≥…UCAn≥…≥UCA2n＝UCB2n≥…≥UCB1＝UCA1 (11)
as can be seen from the analysis of the formula (11), UCA1Being both the largest and smallest of the inequalities, the only condition for the inequality to hold is:
UCA1＝UCA2＝…UCAn＝…＝UCA2n＝UCB2n＝…＝UCB1＝UCA1 (12)
the balancing of the capacitor voltages of the A, B two-phase submodules can be achieved through steps (a) - (d). Due to the modular structural characteristic of the MMC, the connection mode of the C-phase sub-module is the same as that of the A-phase bridge arm sub-module, and with the successive input and removal of capacitors of the sub-modules, the capacitor voltage of each sub-module in the interphase bidirectional self-voltage-sharing MMC is in a dynamic balance state. Therefore, the MMC with the self-voltage-sharing capability can realize self-balancing of capacitance and voltage of the sub-modules only by means of the input and cutting actions of the sub-modules while finishing direct-current energy conversion.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit and scope of the present invention.

Claims (4)

1. The utility model provides a MMC topological structure with alternate two-way from voltage-sharing ability which characterized in that: the bridge circuit consists of A, B, C three-phase circuits, wherein each phase circuit comprises an upper bridge arm, a lower bridge arm and two bridge arm inductors, and each bridge arm comprises N sub-modules; the voltage-sharing circuit and the voltage-sharing circuit are different between the single-phase circuit and the adjacent two-phase circuit, the voltage-sharing in the single phase is realized by forming the voltage-sharing circuit between the adjacent sub-modules by using diodes, the voltage-sharing between phases is realized by using IGBTs and inductors between the adjacent phases, and the whole bidirectional self-voltage-sharing MMC topology comprises 6N +4 IGBT modules and 3N-3 diodes.
2. The MMC topology structure with interphase bidirectional self-voltage-sharing capability according to claim 1, characterized in that: A. the C two-phase circuit adopts the same topology, the B phase circuit topology is different from the A, C two phases, and the connection mode of the A, C two-phase circuit is as follows: the upper input end of the 1 st sub-module of the upper bridge arm is connected with the positive electrode of the direct current side, the lower input end is connected with the upper input end of the 2 nd sub-module of the upper bridge arm, the voltage-sharing branch is connected with the positive electrode of the capacitor of the 2 nd sub-module of the upper bridge arm, the upper input end of the 2 nd sub-module of the upper bridge arm is connected with the lower input end of the 1 st sub-module of the upper bridge arm, the lower input end of the 2 nd sub-module of the upper bridge arm is connected with the upper input end of the 3 rd sub-module of the upper bridge arm, the voltage-sharing branch is connected with the positive electrode of the capacitor of the 3 rd sub-module of the upper bridge arm, the upper input end of the i-1 th sub-module of the upper bridge arm is connected with the lower input end of the i +1 th sub-module of the upper bridge arm, the upper input end of the N-, the lower input end of the sub-module of the I < th > sub-module of the lower bridge arm is connected with the lower input end of the sub-module of the i < th > sub-module of the lower bridge arm, the reactor of the upper bridge arm is connected with the reactor of the lower bridge arm in series, a voltage-sharing branch is connected with the positive electrode of the capacitor of the sub-module of the 1 < th > sub-module of the lower bridge arm, the upper input end of the sub-module of the 2 < th > sub-module of the lower bridge arm is connected with the lower input end of the sub-module of the 1 < th > sub-module of the lower bridge arm, the lower input end of the sub-module of the 3 < rd > sub-module of the lower bridge arm, the voltage-sharing branch is connected with the positive electrode of the capacitor of the sub-module of the 3 < rd > sub-module of the lower bridge arm, the upper input end of the sub-module of the i < th > 1, the upper input end of the Nth sub-module of the lower bridge arm is connected with the lower input end of the (N-1) th sub-module of the lower bridge arm, and the lower output end of the Nth sub-module of the lower bridge arm is connected with the negative electrode of the direct current side.
3. The MMC topology structure with interphase bidirectional self-voltage-sharing capability according to claim 1, characterized in that: the voltage-sharing between the adjacent two-phase circuits is different from the voltage-sharing structure adopted in the single-phase circuit, the interphase bidirectional self-voltage-sharing only exists in the first submodule of the upper bridge arm and the last submodule of the lower bridge arm of each phase, and the connection mode between the 1 st submodule of the upper bridge arm of the A, B two-phase circuit is as follows: the negative electrode of the capacitor of the first submodule of the A-phase circuit voltage-sharing loop is connected with the collector of an IGBT, the emitter of the IGBT is connected with the lower output end of the first submodule of the upper bridge arm of the B-phase circuit, the connection mode of the 1 st submodule of the upper bridge arm of the B, C two-phase circuit is the same as that of the 1 st submodule of the upper bridge arm of the A, B two-phase circuit, and the connection mode of the Nth submodule of the lower bridge arm of the A, B two-phase circuit is as follows: the positive electrode of the capacitor of the Nth sub-module of the lower bridge arm of the A-phase circuit is connected with the collector of the IGBT, the emitter of the IGBT is connected with the upper input end of the Nth sub-module of the lower bridge arm of the B-phase circuit, and the connection mode of the Nth sub-module of the lower bridge arm of the B, C two-phase circuit is the same as that of the Nth sub-module of the lower bridge arm of the A, B two-phase circuit.
4. The MMC topology structure with interphase bidirectional self-voltage-sharing capability according to claim 1, characterized in that: A. b, C the directions of the IGBTs between the three-phase circuits can be reversed.
CN201910825587.2A 2019-09-03 2019-09-03 MMC topological structure with interphase bidirectional self-voltage-sharing capability Pending CN110649833A (en)

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