CN107070277B - Active neutral point clamp Five-level converter exchange side charging soft starting circuit and method - Google Patents

Active neutral point clamp Five-level converter exchange side charging soft starting circuit and method Download PDF

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Publication number
CN107070277B
CN107070277B CN201710262612.1A CN201710262612A CN107070277B CN 107070277 B CN107070277 B CN 107070277B CN 201710262612 A CN201710262612 A CN 201710262612A CN 107070277 B CN107070277 B CN 107070277B
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main switch
capacitor
neutral point
current
switch
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CN107070277A (en
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李睿
杨佳涛
于玮
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Shanghai Jiaotong University
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Shanghai Jiaotong University
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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
    • H02M7/487—Neutral point clamped inverters
    • 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
    • H02M1/36—Means for starting or stopping converters
    • 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
    • H02M7/5375—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 with special starting equipment

Abstract

The invention discloses a kind of active neutral point clamp Five-level converter exchange side charging soft starting circuit and methods, it include: three-phase alternating-current supply, current-limiting resistance, the first switch in parallel with current-limiting resistance, with the concatenated second switch of current-limiting resistance and Up Highway UHW capacitor Cup, Down Highway capacitor Cdown；By the closure of main switch, charge simultaneously to striding capacitance and bus capacitor；After striding capacitance voltage reaches setting value, individually charge to bus capacitor.The present invention is using three-phase alternating-current supply to the capacitor charging in current transformer, and structure is simple, and easy to control, increased auxiliary branch is less；Realize safe and reliable efficient soft start.The soft-start method will not influence the work of main circuit in normal conditions, and additional device exists only between three phase mains and bridge arm, it is applicable not only to the ANPC inverter circuit of three-phase three-wire system, and is suitable for the ANPC inverter circuit of three-phase four-wire system and the H-bridge circuit of two-phase ANPC bridge arm.

Description

Active neutral point clamp Five-level converter exchange side charging soft starting circuit and method
Technical field
The present invention relates to a kind of the soft of exchange side charging for being suitable for active five level of neutral point clamp (ANPC-5L) current transformer Starting method, the especially a kind of soft starting circuit and method of safe and reliable efficient exchange side charging.
Background technique
Active five level of neutral point clamp (ANPC-5L) 3-phase power converter, circuit as shown in Figure 1, its every phase bridge arm by ten Two have the main switch (S of anti-paralleled diode1、S2、S3、S4, two S5, two S6, two S7, two S8) and one fly across Capacitor (Cf) constitute.This three-phase Five-level converter can be realized function of generating electricity by way of merging two or more grid systems, can also with bringing onto load independent operating and Driving motor, and the voltage stress of main switch is a quarter of busbar voltage in circuit.But in circuit exist compared with More capacitors, including bus capacitor and striding capacitance have bigger difficulty in terms of capacitor builds pressure strategy, can neither generate very Big charging current, and the voltage stress of main switch cannot be increased.
Through retrieving, the Chinese patent application of Publication No. 202261005U, the utility model provides a kind of five electricity of ANPC The pre-charge circuit of flat current transformer, including rectifying part, restricted portion and divided fraction, three-phase is uncontrollable to rectify obtained electricity Pressure is charged by current-limiting resistance to bus capacitor and striding capacitance, and according to the intrinsic standoff ratio of big resistance be bus capacitor and fly across Capacitive charge value setting value.The utility model solves overcurrent problem caused by converter topologies plug-in, and Condenser voltage is charged to setting value.But the soft start strategy main purpose that the patent proposes only is to solve the topology directly Overcurrent problem caused by charging is connect, therefore is not safe and reliable efficient soft start, and applicability is not strong, it cannot be simultaneously H-bridge circuit, three-phase three-wire system/three-phase four-wire system ANPC circuit suitable for two-phase ANPC bridge arm.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide be suitable for active five level (ANPC- of neutral point clamp 5L) the soft starting circuit and method of the exchange side charging of current transformer, is applicable not only to the ANPC inverter circuit of three-phase three-wire system, And it is suitable for the ANPC inverter circuit of three-phase four-wire system and the H-bridge circuit of two-phase ANPC bridge arm.
According to an aspect of the present invention, a kind of active neutral point clamp Five-level converter exchange side charging soft start is provided Circuit, comprising: three-phase alternating-current supply, current-limiting resistance, the first switch in parallel with current-limiting resistance, with current-limiting resistance concatenated second Switch and Up Highway UHW capacitor Cup, Down Highway capacitor Cdown；Wherein:
The current-limiting resistance at least two, the first switch quantity is identical as the current-limiting resistance quantity, one of them The current-limiting resistance is in parallel with a first switch；The second switch quantity is 3, is connected to the three-phase alternating current Between the three-phase in source and the single-phase bridge arm of the active neutral point clamp Five-level converter；Five level of active neutral point clamp becomes The single-phase bridge arm for flowing device is connected to the Up Highway UHW capacitor C simultaneouslyUP, the Down Highway capacitor CDOWNBetween；
The second switch of one current-limiting resistance through series connection with it is connected to the active neutral point clamp five Any single-phase bridge arm in level current transformer；An output is arranged between each current-limiting resistance and the three-phase alternating-current supply to filter Wave inductance L.
Further, the active single-phase bridge arm of neutral point clamp Five-level converter, which includes: 12, has inverse parallel two The main switch of pole pipe and a striding capacitance Cf, described 12 there are the main switches of anti-paralleled diode to be respectively as follows: one Main switch S1, a main switch S2, a main switch S3, a main switch S4, two main switch S5, two masters open Close pipe S6, two main switch S7, two main switch S8, in which: two main switch S5, a main switch S3, a master Switching tube S1, a main switch S2, a main switch S4, two main switch S8It is sequentially connected in series rear and Up Highway UHW capacitor CUP、 Down Highway capacitor CDOWNParallel connection, in main switch S1、S2Tie point draw the exchange outlet of single-phase bridge arm, two main switches S6, two main switch S7It is sequentially connected in series rear and main switch S3、S1、S2、S4The whole parallel connection being connected into, main switch S6、S7's Tie point and Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNTie point be connected, striding capacitance CfWith main switch S1、S2Series connection At it is whole in parallel.
According to another aspect of the present invention, provide that a kind of active neutral point clamp Five-level converter exchange side charging is soft to open Dynamic method, comprising the following steps:
Step S01: Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNVoltage be zero, striding capacitance Cfa、Cfb、CfcElectricity Pressure is also zero, and the first switch, the second switch disconnect, and active neutral point clamp Five-level converter, which is in, shuts down shape State；At this point, being closed the main switch S of single-phase bridge arm in the active neutral point clamp Five-level converter3、S4、S5、S8, and be closed Second switch gives Up Highway UHW capacitor C by the current-limiting resistance by three-phase alternating-current supplyUP, Down Highway capacitor CDOWNWith winged across electricity Capacity charge；
Step S02: when striding capacitance voltage reaches setting value E, wherein E indicate total busbar voltage setting value four/ One, disconnect the main switch S of single-phase bridge arm in the active neutral point clamp Five-level converter3、S4、S5、S8, and described in closure The main switch S of single-phase bridge arm in active neutral point clamp Five-level converter7, the current-limiting resistance is passed through by three-phase alternating-current supply Give Up Highway UHW capacitor CUPCharging；
Step S03: as Up Highway UHW capacitor CUPWhen voltage reaches setting value 2E, the i.e. half of busbar voltage, institute is disconnected State the main switch S of single-phase bridge arm in active neutral point clamp Five-level converter7, and it is closed five level of active neutral point clamp The main switch S of single-phase bridge arm in current transformer6, Down Highway capacitor C is given by the current-limiting resistance by three-phase alternating-current supplyDOWNIt fills Electricity；
Step S04: bus capacitor C instantlyDOWNWhen voltage reaches setting value 2E, the i.e. half of busbar voltage, disconnect The main switch S of single-phase bridge arm in the active neutral point clamp Five-level converter6, and it is closed first switch, soft start-up process It completes, the active neutral point clamp Five-level converter is in standby.
Preferably, the method utilizes the main switch of single-phase bridge arm in the active neutral point clamp Five-level converter S3、S4、S5、S8By striding capacitance and Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNParallel connection makes striding capacitance and Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNIt is charged simultaneously by three-phase alternating-current supply.
Preferably, the method passes through the main switch to single-phase bridge arm in the active neutral point clamp Five-level converter S6、S7Control, realize striding capacitance voltage first in Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNVoltage reaches its setting value, Guarantee that the voltage stress of all main switches of single-phase bridge arm in the active neutral point clamp Five-level converter is not higher than mother The a quarter of line voltage.
Compared with prior art, the present invention have it is following the utility model has the advantages that
The soft-start method of the exchange side charging of active five level of neutral point clamp (ANPC-5L) current transformer of the present invention, it is only necessary to Six extra switch K1, K2, K3, K4, K5, K6 and three additional resistances R1, R2, R3 are wanted, adjunct circuit is extremely simple；
Meanwhile the present invention is by the main switch S of every phase3、S4、S5、S8、S6、S7As a part of soft start, and remain The complete independence of every phase bridge arm realizes that striding capacitance voltage first reaches its setting value in bus capacitor voltage, guarantees each master The voltage stress of switch is not higher than a quarter of busbar voltage, realizes safe and reliable efficient soft start；
Finally, soft-start method proposed by the present invention, is applicable not only to the ANPC inverter circuit of three-phase three-wire system, and Suitable for the ANPC inverter circuit of three-phase four-wire system and the H-bridge circuit of two-phase ANPC bridge arm.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention, Objects and advantages will become more apparent upon:
Fig. 1 is existing three-phase ANPC inverter circuit diagram；
Fig. 2 is the circuit diagram of one embodiment of the invention soft starting circuit；
Fig. 3 is the circuit diagram of another embodiment of the present invention soft starting circuit；
Fig. 4 is the soft-start method step schematic diagram of one embodiment of the present invention；
Fig. 5 is the control pulse sequence and capacitance voltage waveform in soft start-up process of one embodiment of the present invention Figure；
Fig. 6~Figure 10 is the work equivalent circuit diagram in each stage in soft start-up process of one embodiment of the present invention.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention Protection scope.
As shown in Fig. 2, a kind of exchange side charging for being suitable for active five level of neutral point clamp (ANPC-5L) current transformer is soft Start-up circuit, comprising: three-phase alternating-current supply, current-limiting resistance R1, R2, R3, the switch in parallel with current-limiting resistance R1, R2, R3 difference K1, K2, K3 distinguish concatenated switch K4, K5, K6, Up Highway UHW capacitor C with current-limiting resistance R1, R2, R3up, Down Highway capacitor Cdown；
Every one-phase circuit includes: to be had by 12 in active five level of neutral point clamp (ANPC-5L) current transformer three-phase a, b, c There is the main switch (S of anti-paralleled diode1、S2、S3、S4, two S5, two S6, two S7, two S8) and a striding capacitance Cf Composition five level single-phase-bridge arm of active neutral point clamp and three connect respectively in current-limiting resistance R1, R2, R3 and three-phase alternating current Output inductor L between source.As shown in the figure, 12 in the main switch of anti-paralleled diode, capacitor, wherein under Mark includes a, indicates component in a circuitry phase；Subscript includes b's, indicates component in b circuitry phase；Subscript includes c, table Show component in c circuitry phase.
In the embodiment depicted in figure 2, described current-limiting resistance R1, R2, R3 are in parallel with switch K1, K2, K3 respectively, current limliting electricity The one end and three output inductor L for hindering R1, R2, R3 are connected, the other end and corresponding active five level of neutral point clamp are single-phase The output end of bridge arm is connected.
As shown in figure 3, in another preferred embodiment, other structures are identical as Fig. 2, difference is current-limiting resistance and switch Setting, described current-limiting resistance R1, R2 are in parallel with switch K1, K2 respectively, one end of current-limiting resistance R1, R2 and output filtered electrical Sense L is connected, the other end is connected with the output end of corresponding active five level single-phase-bridge arm of neutral point clamp.
As shown in figure 4, a kind of exchange side charging for being suitable for active five level of neutral point clamp (ANPC-5L) current transformer is soft Starting method, comprising the following steps:
Step S01: Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNVoltage be zero, striding capacitance Cfa、Cfb、CfcElectricity Pressure is also zero, and switch K1, K2, K3, K4, K5, K6 are disconnected, and the active five level 3-phase power converter of neutral point clamp of ANPC, which is in, shuts down State；At this point, being closed the main switch S of every phase3、S4、S5、S8, and closure switch K4, K5, K6, passed through by three-phase alternating-current supply Current-limiting resistance R1, R2, R3 give Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNWith striding capacitance Cfa、Cfb、CfcCharging；
Step S02: as striding capacitance Cfa、Cfb、CfcVoltage reaches setting value E, and (E indicates the four of total busbar voltage setting value / mono-, similarly hereinafter), i.e., a quarter of busbar voltage when, disconnect the main switch S of every phase3、S4、S5、S8, and it is closed every phase Main switch S7, Up Highway UHW capacitor C is given by current-limiting resistance R1, R2, R3 by three-phase alternating-current supplyUPCharging；
Step S03: as Up Highway UHW capacitor CUPWhen voltage reaches setting value 2E, the i.e. half of busbar voltage, disconnect every The main switch S of phase7, and it is closed the main switch S of every phase6, lower mother is given by current-limiting resistance R1, R2, R3 by three-phase alternating-current supply Line capacitance CDOWNCharging；
Step S04: bus capacitor C instantlyDOWNWhen voltage reaches setting value 2E, the i.e. half of busbar voltage, disconnect The main switch S of every phase6, and closure switch K1, K2, K3, soft start-up process are completed, the active five level three-phase of neutral point clamp of ANPC Current transformer is in standby.
For being suitable for the soft-start method of the exchange side charging of active five level of neutral point clamp (ANPC-5L) current transformer, Control pulse sequence and capacitance voltage waveform in soft start-up process, as shown in Figure 5；
Wherein:
1 (t of stage0-t1):
As shown in fig. 6, Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNVoltage be zero, striding capacitance CfaVoltage It is zero, switch K1, K2, K3, K4, K5, K6 are disconnected, and the active five level 3-phase power converter of neutral point clamp of ANPC, which is in, shuts down shape State.
2 (t of stage1-t2):
As shown in fig. 7, being closed the main switch S of every phase3、S4、S5、S8(the S in specifically Fig. 7a3、Sa4、Sa5、Sa8, Sb3、 Sb4、Sb5、Sb8, Sc3、Sc4、Sc5、Sc8), and closure switch K4, K5, K6, current-limiting resistance R1, R2, R3 are passed through by three-phase alternating-current supply Give Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNWith striding capacitance Cfa、Cfb、CfcCharging, until striding capacitance Cfa、Cfb、CfcElectricity Pressure reaches setting value E (E indicates a quarter of total busbar voltage setting value, similarly hereinafter), the i.e. a quarter of busbar voltage.
3 (t of stage2-t3):
As shown in figure 8, disconnecting the main switch S of every phase3、S4、S5、S8(specifically Sa3、Sa4、Sa5、Sa8, Sb3、Sb4、Sb5、 Sb8, Sc3、Sc4、Sc5、Sc8), and it is closed the main switch S of every phase7(specifically Sa7、Sb7、Sc7), limit is passed through by three-phase alternating-current supply Leakage resistance R1, R2, R3 give Up Highway UHW capacitor CUPCharging, until Up Highway UHW capacitor CUPVoltage reaches setting value 2E, i.e. busbar voltage Half.
4 (t of stage3-t4):
As shown in figure 9, disconnecting the main switch S of every phase7(specifically Sa7、Sb7、Sc7), and it is closed the main switch S of every phase6 (specifically Sa6、Sb6、Sc6), Down Highway capacitor C is given by current-limiting resistance R1, R2, R3 by three-phase alternating-current supplyDOWNCharging, until Down Highway capacitor CDOWNVoltage reaches setting value 2E, the i.e. half of busbar voltage.
5 (t of stage4-t5):
As shown in Figure 10, the main switch S of every phase is disconnected6(specifically Sa6、Sb6、Sc6), and closure switch K1, K2, K3, The active five level 3-phase power converter of neutral point clamp of ANPC is in standby.
For embodiment shown in Fig. 3, specific implementation is similar with above-mentioned embodiment illustrated in fig. 2, for art technology For personnel, on the basis of foregoing description, it is readily appreciated that, and will not be described here in detail.
Based on the above embodiment, of the present invention suitable for active five level of neutral point clamp (ANPC-5L) current transformer The soft Starting Technology of side charging is exchanged, using three-phase alternating-current supply to the capacitor charging in current transformer, structure is simple, controlling party Just, increased auxiliary branch is less, and adjunct circuit is extremely simple；At most only need six extra switch K1, K2, K3, K4, K5, K6 and three additional resistance R1, R2, R3；
Meanwhile the present invention is by the main switch S of every phase3、S4、S5、S8、S6、S7As a part of soft start, and remain The complete independence of every phase bridge arm realizes that striding capacitance voltage first reaches its setting value in bus capacitor voltage, guarantees each master The voltage stress of switch is not higher than a quarter of busbar voltage, realizes safe and reliable efficient soft start；
Finally, the present invention is applicable not only to the ANPC inverter circuit of three-phase three-wire system, and it is suitable for three-phase four-wire system ANPC inverter circuit and two-phase ANPC bridge arm H-bridge circuit.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow Substantive content of the invention is rung, protection scope of the present invention is defined by the appended claims.

Claims (3)

1. a kind of five electricity of active neutral point clamp based on active neutral point clamp Five-level converter exchange side charging soft starting circuit Flat AC side of converter charging soft-start method, which is characterized in that the circuit, comprising: three-phase alternating-current supply, current-limiting resistance, The first switch in parallel with current-limiting resistance, with the concatenated second switch of current-limiting resistance and Up Highway UHW capacitor Cup, Down Highway capacitor Cdown；Wherein:
The current-limiting resistance at least two, the first switch quantity is identical as the current-limiting resistance quantity, described in one of them Current-limiting resistance is in parallel with a first switch；The second switch quantity is 3, is connected to the three-phase alternating-current supply Between three-phase and the single-phase bridge arm of the active neutral point clamp Five-level converter；The active neutral point clamp Five-level converter Single-phase bridge arm be connected to the Up Highway UHW capacitor C simultaneouslyUP, the Down Highway capacitor CDOWNBetween；
The second switch of one current-limiting resistance through series connection with it is connected to five level of active neutral point clamp Any single-phase bridge arm in current transformer；One output filtered electrical is set between each current-limiting resistance and the three-phase alternating-current supply Feel L；
The active single-phase bridge arm of neutral point clamp Five-level converter include: 12 with anti-paralleled diode main switch and One striding capacitance Cf, described 12 there are the main switches of anti-paralleled diode to be respectively as follows: a main switch S1, one Main switch S2, a main switch S3, a main switch S4, two main switch S5, two main switch S6, two masters open Close pipe S7, two main switch S8, in which: two main switch S5, a main switch S3, a main switch S1, a master Switching tube S2, a main switch S4, two main switch S8It is sequentially connected in series rear and Up Highway UHW capacitor CUP, Down Highway capacitor CDOWN Parallel connection, in main switch S1、S2Tie point draw the exchange outlet of single-phase bridge arm, two main switch S6, two main switches S7It is sequentially connected in series rear and main switch S3、S1、S2、S4The whole parallel connection being connected into, main switch S6、S7Tie point and Up Highway UHW Capacitor CUP, Down Highway capacitor CDOWNTie point be connected, striding capacitance CfWith main switch S1、S2What is be connected into is whole in parallel；
It the described method comprises the following steps:
Step S01: Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNVoltage be zero, striding capacitance Cfa、Cfb、CfcVoltage It is zero, the first switch, the second switch disconnect, and active neutral point clamp Five-level converter is in shutdown status；This When, it is closed the main switch S of single-phase bridge arm in the active neutral point clamp Five-level converter3、S4、S5、S8, and it is closed second Switch gives Up Highway UHW capacitor C by the current-limiting resistance by three-phase alternating-current supplyUP, Down Highway capacitor CDOWNIt is filled with striding capacitance Electricity；
Step S02: when striding capacitance voltage reaches setting value E, wherein E indicates a quarter of total busbar voltage setting value, breaks Open the main switch S of single-phase bridge arm in the active neutral point clamp Five-level converter3、S4、S5、S8, and be closed it is described it is active in The main switch S of single-phase bridge arm in point clamp Five-level converter7, upper mother is given by the current-limiting resistance by three-phase alternating-current supply Line capacitance CUPCharging；
Step S03: as Up Highway UHW capacitor CUPWhen voltage reaches setting value 2E, the i.e. half of busbar voltage, have described in disconnection The main switch S of single-phase bridge arm in the neutral point clamp Five-level converter of source7, and it is closed the five level unsteady flow of active neutral point clamp The main switch S of single-phase bridge arm in device6, Down Highway capacitor C is given by the current-limiting resistance by three-phase alternating-current supplyDOWNCharging；
Step S04: bus capacitor C instantlyDOWNWhen voltage reaches setting value 2E, the i.e. half of busbar voltage, have described in disconnection The main switch S of single-phase bridge arm in the neutral point clamp Five-level converter of source6, and it is closed first switch, soft start-up process is completed, institute Active neutral point clamp Five-level converter is stated to be in standby.
2. charge soft-start method for active neutral point clamp Five-level converter exchange side according to claim 1, feature Be: the method utilizes the main switch S of single-phase bridge arm in the active neutral point clamp Five-level converter3、S4、S5、S8It will Striding capacitance and Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNParallel connection makes striding capacitance and Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNIt is charged simultaneously by three-phase alternating-current supply.
3. charge soft-start method for active neutral point clamp Five-level converter exchange side according to claim 1 or 2, special Sign is: the method passes through the main switch S to single-phase bridge arm in the active neutral point clamp Five-level converter6、S7Control System realizes striding capacitance voltage first in Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNVoltage reaches its setting value, described in guarantee The voltage stress of all main switches of single-phase bridge arm is not higher than busbar voltage in active neutral point clamp Five-level converter A quarter.
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