CN109617445A - Five-level converter DC side charging soft starting circuit and method - Google Patents

Five-level converter DC side charging soft starting circuit and method Download PDF

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Publication number
CN109617445A
CN109617445A CN201811506042.7A CN201811506042A CN109617445A CN 109617445 A CN109617445 A CN 109617445A CN 201811506042 A CN201811506042 A CN 201811506042A CN 109617445 A CN109617445 A CN 109617445A
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China
Prior art keywords
capacitor
highway
switch
level converter
voltage
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Granted
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CN201811506042.7A
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CN109617445B (en
Inventor
郑帅
李睿
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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
    • H02M7/53—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
    • 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
    • H02M7/53—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

Abstract

The present invention provides a kind of Five-level converter DC side charging soft starting circuits, comprising: switch K1, K2, current-limiting resistance R1, divider resistance R2, R3, Up Highway UHW capacitor, Down Highway capacitor and the single-phase bridge arm of novel Five-level converter.Method are as follows: 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 configuration of the present invention is simple, easy to control, increased auxiliary branch is less；By the control to main switch, guarantee the voltage stress when voltage stress of each main switch is not higher than normal operation, realizes safe and reliable efficient soft start.A kind of soft-start method of above-mentioned Five-level converter DC side charging soft starting circuit is provided simultaneously.The present invention will not influence the work of main circuit in normal conditions, and additional device exists only on bus, suitable for single-phase five level circuit, three-phase three-wire system, three-phase four-wire system five-electrical level inverter circuit.

Description

Five-level converter DC side charging soft starting circuit and method
Technical field
The present invention relates to a kind of DC side charging soft Starting Technologies, and in particular, to one kind is suitable for novel five level and becomes Device DC side charging soft starting circuit and method is flowed, is a kind of safe and reliable efficient DC side charging soft starting circuit and side Method.
Background technique
A kind of existing Five-level converter, circuit as shown in Figure 1, the five-electrical level inverter mainly by three capacitors, two A diode and eight full-controlled switch pipe compositions.This single-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.But there are more capacitor, including bus capacitor and striding capacitance in circuit, There is bigger difficulty in terms of capacitor builds pressure strategy, very big charging current can neither be generated, and main switch cannot be increased Voltage stress.Especially in normal operation main switch S5And S7Voltage stress be busbar voltage 3/4ths, compared to Its voltage stress of remaining main switch is larger, if direct plungeing into operation without suitable soft start strategy, main switch S5And S7The voltage stress in several periods will be approximately equal to busbar voltage before operation, the two main switches probably due to Overtension and puncture.
Through retrieving, the Chinese patent application of Publication No. CN202261005U, the utility model provides a kind of ANPC five The pre-charge circuit of level current transformer, including rectifying part, restricted portion and divided fraction, three-phase is uncontrollable to rectify obtained electricity Pressure is charged to bus capacitor and striding capacitance by current-limiting resistance, 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.
The soft starting circuit proposed in above-mentioned patent application (CN202261005U), main purpose are that solving ANPC opens up Overcurrent problem caused by plug-in is flutterred, therefore is not safe and reliable efficient soft start, and applicability is not strong, it cannot The soft of five-electrical level inverter circuit suitable for one-phase five-level inverter circuit, three-phase three-wire system, three-phase four-wire system is opened simultaneously It is dynamic.
It there is no the technology for Five-level converter soft start to illustrate or report at present, be also not yet collected into both at home and abroad therewith Relevant data.
Summary of the invention
For the defects in the prior art, it is suitable for Five-level converter DC side the object of the present invention is to provide one kind to fill Soft starting circuit and method, using DC side power supply to the capacitor charging in current transformer, structure is simple, easy to control, increases Auxiliary branch it is less, can be realized safe and reliable efficient soft start.
The present invention is achieved by the following technical solutions.
A kind of Five-level converter DC side charging soft starting circuit, comprising: switch K1, switch K2, current-limiting resistance R1, divide Piezoresistance R2, divider resistance R3, Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNAnd the single-phase bridge arm of Five-level converter；Wherein:
One end of switch K2 connects DC side power supply, the other end of one end connection switch K2 of current-limiting resistance R1, current limliting electricity Hinder the other end and Up Highway UHW capacitor C of R1upUpper end be connected or with Down Highway capacitor CDOWNLower end be connected, switch K2 with limit It is in parallel with switch K1 after leakage resistance R1 series connection, divider resistance R2 and divider resistance R3 respectively with Up Highway UHW capacitor CUPWith Down Highway electricity Hold CDOWNParallel connection, the single-phase bridge arm of five level circuits three ends input respectively with Up Highway UHW capacitor CUPUpper end, Up Highway UHW capacitor CUP Lower end and Down Highway capacitor CDOWNUpper end, Down Highway capacitor CDOWNLower end be connected.
Preferably, the single-phase bridge arm of the Five-level converter is one or more.
Preferably, the single-phase bridge arm topological structure of the Five-level converter are as follows: DC side respectively with Up Highway UHW capacitor CUP's Upper end and Down Highway capacitor CDOWNLower end connection, close to exchange side one end be equipped with a flying capacitor Cf；The positive and negative anodes of DC side Pass through main switch S respectively5With main switch S7It is connected with the positive and negative anodes of flying capacitor；DC side midpoint passes through respectively to be controlled entirely Switching tube S6, full control switching tube S8, inverse-impedance type control switching tube S entirely4, inverse-impedance type control switching tube S entirely3And two diodes and outstanding Floating capacitor CfPositive and negative anodes be connected；Flying capacitor CfPositive and negative anodes with exchange between the output of side respectively by full-controlled switch pipe S1、 Full-controlled switch pipe S2It is connected.
Preferably, the main switch S5With main switch S7It is full-controlled switch pipe.
It preferably, further include output inductor L, the output end of the single-phase bridge arm of Five-level converter and output filter Inductance L is connected.
According to another aspect of the present invention, a kind of above-mentioned Five-level converter DC side charging soft starting circuit is provided Soft-start method, comprising the following steps:
Step S01: Up Highway UHW capacitor CUPWith Down Highway capacitor CDOWNIt is zero, flying capacitor CfVoltage is zero, switch K1 It is disconnected with switch K2, Five-level converter is in shutdown status；At this point, closure main switch pipe S5With main switch S7, and be closed Switch K2 gives Up Highway UHW capacitor C by current-limiting resistance R1 by DC side power supplyUP, Down Highway capacitor CDOWNWith flying capacitor CfIt fills Electricity, divider resistance R2 and divider resistance R3 equilibrium Up Highway UHW capacitor CUPWith Down Highway capacitor CDOWNVoltage；
Step S02: as flying capacitor CfVoltage reaches setting value E, wherein E indicate total busbar voltage setting value four/ One, disconnect main switch S5With main switch S7, Up Highway UHW capacitor C is given by current-limiting resistance R1 by DC side power supplyUPWith lower mother Line capacitance CDOWNCharging, divider resistance R2 and divider resistance R3 equilibrium Up Highway UHW capacitor CUPWith Down Highway capacitor CDOWNVoltage；
Step S03: as Up Highway UHW capacitor CUPWith Down Highway capacitor CDOWNVoltage reaches setting value 2E, i.e., the two of busbar voltage When/mono-, closure switch K1, Five-level converter is in standby.
Preferably, pass through main switch S5With main switch S7By flying capacitor CfWith Up Highway UHW capacitor CUPWith Down Highway electricity Hold CDOWNParallel connection makes flying capacitor CfWith Up Highway UHW capacitor CUPWith Down Highway capacitor CDOWNSimultaneously by DC side power source charges.
Preferably, by main switch S5With main switch S7Control, realize flying capacitor CfVoltage first is in upper mother Line capacitance CUPWith Down Highway capacitor CDOWNVoltage reaches its setting value, makes main switch S5With main switch S7Voltage stress not Higher than 3/4ths of busbar voltage, full-controlled switch pipe S1, full-controlled switch pipe S2, inverse-impedance type control switching tube S entirely3, inverse-impedance type Full control switching tube S4, full control switching tube S6, full control switching tube S8Voltage stress be not higher than a quarter of busbar voltage.
Compared with prior art, the present invention have it is following the utility model has the advantages that
It is proposed by the present invention to be suitable for Five-level converter DC side charging soft Starting Technology (circuit and method), it is only necessary to two A extra switch K1, K2 and three additional resistances R1, R2, R3, adjunct circuit are extremely simple.
Five-level converter DC side proposed by the present invention charges soft Starting Technology (circuit and method), by switching tube S3、 S4、S5、S8As a part of soft start, and the complete independence of the active five level single-phase-bridge arm of neutral point clamp of ANPC is remained, It realizes that striding capacitance voltage first reaches its setting value in Up Highway UHW capacitor, Down Highway capacitance voltage, makes main switch S5、S7's Voltage stress is not higher than 3/4ths of busbar voltage, switching tube S1、S2、S3、S4、S6、S8Voltage stress be not higher than bus The a quarter of voltage realizes safe and reliable efficient soft start.
Five-level converter DC side charging soft-start method proposed by the present invention is applicable not only to single-phase five level unsteady flow Device circuit, and it is suitable for the Five-level converter circuit of three-phase three-wire system, three-phase four-wire system.
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 single-phase Five-level converter circuit topology figure；
Fig. 2 is the DC side charging soft starting circuit topological diagram of one embodiment of the present invention；
Fig. 3 is the DC side charging soft starting circuit topological diagram of another preferred embodiment of the present invention；
Fig. 4 is the step schematic diagram of the soft-start method 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~Fig. 9 is respectively the work equivalent circuit in each stage in soft start-up process of one embodiment of the present invention Figure；Wherein, Fig. 6 is 1 (t of stage0-t1):, Fig. 7 is 2 (t of stage1-t2), Fig. 8 is 3 (t of stage2-t3), Fig. 9 is 4 (t of stage3- t4)。
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.
The embodiment of the invention provides a kind of Five-level converter DC side charging soft starting circuits, comprising: switch K1, opens Close K2, current-limiting resistance R1, divider resistance R2, R3, Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNAnd active neutral point clamp five The single-phase bridge arm of level current transformer；Wherein:
One end of switch K2 connects DC side power supply, the other end of one end connection switch K2 of current-limiting resistance R1, current limliting electricity Hinder the other end and Up Highway UHW capacitor C of R1upUpper end be connected or with Down Highway capacitor CDOWNLower end be connected, switch K2 with limit , divider resistance R2, R3 and Up Highway UHW capacitor C in parallel with switch K1 after leakage resistance R1 series connectionUP, Down Highway capacitor CDOWNRespectively simultaneously Connection, the single-phase bridge arm of five level circuit of source neutral point clamp three ends input respectively with Up Highway UHW capacitor CUPUpper end, Up Highway UHW capacitor CUPLower end, that is, Down Highway capacitor CDOWNUpper end, Down Highway capacitor CDOWNLower end be connected.
Further, further include output inductor L, the active single-phase bridge arm of neutral point clamp Five-level converter it is defeated Outlet is connected with output inductor L.
Further, the topological structure of the novel Five-level converter are as follows: there are two capacitors to connect for DC side, leans on inbreeding There is a flying capacitor in stream side；The positive and negative anodes of DC side pass through the positive and negative anodes phase of a full-controlled switch pipe with flying capacitor respectively Even；DC side midpoint controls switching tube and two diodes and flying capacitor by two full control switching tubes and two inverse-impedance types entirely Positive and negative anodes be connected；The positive and negative anodes of flying capacitor are connected with exchanging respectively by full-controlled switch pipe between the output of side.
The embodiment of the present invention also provides the soft starting method of Five-level converter DC side charging soft starting circuit, including Following steps:
Step S01: Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNIt is zero, flying capacitor CfVoltage is also zero, switch K1, K2 are disconnected, and active five level single-phase converter of neutral point clamp is in shutdown status；At this point, closure main switch pipe S5、S7, and Closure switch K2 gives Up Highway UHW capacitor C by current-limiting resistance R1 by DC side power supplyUP, Down Highway capacitor CDOWNAnd flying capacitor CfCharging, divider resistance R2, R3 equilibrium Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNVoltage；
Step S02: as flying capacitor CfVoltage reaches setting value E, wherein E indicate total busbar voltage setting value four/ One, disconnect main switch S5、S7, Up Highway UHW capacitor C is given by current-limiting resistance R1 by DC side power supplyUP, Down Highway capacitor CDOWNIt fills Electricity, divider resistance R2, R3 equilibrium Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNVoltage；
Step S03: as Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNVoltage reaches setting value 2E, i.e., the two of busbar voltage When/mono-, closure switch K1, the five level single-phase converter is in standby.
Further, the method passes through main switch S5、S7By flying capacitor CfWith Up Highway UHW capacitor CUP, Down Highway electricity Hold CDOWNParallel connection makes flying capacitor CfWith Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNSimultaneously by DC side power source charges.
Further, the method passes through to main switch S5、S7Control, realize flying capacitor CfVoltage first is in upper Bus capacitor CUP, Down Highway capacitor CDOWNVoltage reaches its setting value, makes each main switch S1、S2、S3、S4、S5、S6、S7、S8's Voltage stress is not higher than a quarter of busbar voltage.
The technical solution of the above embodiment of the present invention is described in further detail with reference to the accompanying drawing.
As shown in Fig. 2, being provided a kind of suitable for the straight of Five-level converter shown in Fig. 1 in the above embodiment of the present invention Side charging soft starting circuit is flowed, passes through and increases by two extra switch on the active single-phase bridge arm of neutral point clamp Five-level converter K1, K2 and three additional resistances R1, R2, R3, the circuit include: DC side power supply DC, are opened with what DC side power supply DC was connected K2 is closed, is connect in switch K2 and Up Highway UHW capacitor CupBetween current-limiting resistance R1, it is in parallel with concatenated current-limiting resistance R1 and switch K2 Switch K1, Up Highway UHW capacitor CUP, Down Highway capacitor CDOWN, two and Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNRespectively simultaneously Divider resistance R2, R3 of the identical big resistance value of connection, by a flying capacitor Cf, six diodes and eight full-controlled switch pipe groups At the single-phase bridge arm of Five-level converter, and connect in the single-phase bridge arm output end of Five-level converter and AC network or load Between output inductor L.
Several single-phase bridge arms of the Five-level converter are connected in DC bus side obtains five level unsteady flow of poly-phasic multi system Device；The single single-phase bridge arm of Five-level converter is single-phase converter.The circuit connecting mode and one of several single-phase bridge arms The circuit connecting mode of a single-phase bridge arm is identical, and details are not described herein again.
In a preferred embodiment, the current-limiting resistance R1 is in parallel with switch K1 again after connecting with switch K2, current limliting electricity One end of resistance R1 is connected with switch K2, the other end and Up Highway UHW capacitor C of current-limiting resistance R1UPUpper end be connected, five level unsteady flows The single-phase bridge arm of device three ends input respectively with Up Highway UHW capacitor CUPUpper end, Up Highway UHW capacitor CUPLower end (i.e. Down Highway capacitor CDOWNUpper end) and Down Highway capacitor CDOWNLower end be connected, the output end of the single-phase bridge arm of Five-level converter and output filtered electrical Feel L to be 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；The current-limiting resistance R1 is in parallel with switch K1 again after connecting with switch K2, one end of current-limiting resistance R1 and switch K2 It is connected, the other end and Down Highway capacitor C of current-limiting resistance R1DOWNLower end be connected, three ends of the single-phase bridge arm of Five-level converter Input respectively with Up Highway UHW capacitor CUPUpper end, Up Highway UHW capacitor CUPLower end (i.e. Down Highway capacitor CDOWNUpper end) and lower mother Line capacitance CDOWNLower end be connected, the output end of the single-phase bridge arm of Five-level converter is connected with output inductor L.
As shown in figure 4, a kind of soft-start method for Five-level converter DC side charging soft starting circuit is provided, The following steps are included:
Step S01: Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNIt is zero, flying capacitor CfVoltage is also zero, switch K1, K2 are disconnected, and five level single-phase converters are in shutdown status；At this point, closure main switch pipe S5、S7, and closure switch K2, Up Highway UHW capacitor C is given by current-limiting resistance R1 by DC side power supplyUP, Down Highway capacitor CDOWNWith flying capacitor CfCharging, partial pressure Resistance R2, R3 equilibrium Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNVoltage；
Step S02: as flying capacitor CfVoltage reach setting value E (E indicates a quarter of total busbar voltage setting value, Similarly hereinafter), i.e., a quarter of busbar voltage when, disconnect main switch S5、S7, by DC side power supply by current-limiting resistance R1 to upper Bus capacitor CUP, Down Highway capacitor CDOWNCharging, divider resistance R2, R3 equilibrium Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNElectricity Pressure；
Step S03: as Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNVoltage reaches setting value 2E, i.e., the two of busbar voltage When/mono-, closure switch K1, five level single-phase converters are in standby.
The circuit soft-start method of several single-phase bridge arms is identical as the circuit soft-start method of a single-phase bridge arm, herein not It repeats again.
In one embodiment, the soft-start method to charge for being suitable for the DC side of the Five-level converter, soft start Control pulse sequence and capacitance voltage waveform in the 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 CDOWNIt is zero, flying capacitor CfVoltage is also zero, switch K1, K2 are disconnected, and five level single-phase converters are in shutdown status.
2 (t of stage1-t2):
As shown in fig. 7, closure main switch pipe S5、S7, and closure switch K2, it is given by DC side power supply by current-limiting resistance R1 Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNWith flying capacitor CfCharging, divider resistance R2, R3 equilibrium Up Highway UHW capacitor CUP, under Bus capacitor CDOWNVoltage, until flying capacitor CfVoltage reach setting value E (E indicate total busbar voltage setting value four/ One, similarly hereinafter), i.e. a quarter of busbar voltage.
3 (t of stage2-t3):
As shown in figure 8, disconnecting main switch S5、S7, Up Highway UHW capacitor C is given by current-limiting resistance R1 by DC side power supplyUP、 Down Highway capacitor CDOWNCharging, divider resistance R2, R3 equilibrium Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNVoltage, until upper mother Line capacitance Cup, Down Highway capacitor CdownVoltage reach setting value 2E, the i.e. half of busbar voltage.
4 (t of stage3-t4):
As shown in figure 9, closure switch K1, capacitor is built pressure and is completed, and five level single-phase converters are in standby.
For embodiment shown in Fig. 3, specific implementation is similar with above-mentioned embodiment illustrated in fig. 2, is no longer described in detail.
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 (8)

  1. The soft starting circuit 1. a kind of Five-level converter DC side charges characterized by comprising switch K1, switch K2, current limliting Resistance R1, divider resistance R2, divider resistance R3, Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNAnd Five-level converter is single-phase Bridge arm；Wherein:
    One end of switch K2 connects DC side power supply, the other end of one end connection switch K2 of current-limiting resistance R1, current-limiting resistance R1 The other end and Up Highway UHW capacitor CupUpper end be connected or with Down Highway capacitor CDOWNLower end be connected, switch K2 and current limliting are electric Hinder it is in parallel with switch K1 after R1 series connection, divider resistance R2 and divider resistance R3 respectively with Up Highway UHW capacitor CUPWith Down Highway capacitor CDOWNParallel connection, the single-phase bridge arm of five level circuits three ends input respectively with Up Highway UHW capacitor CUPUpper end, Up Highway UHW capacitor CUP's Lower end and Down Highway capacitor CDOWNUpper end, Down Highway capacitor CDOWNLower end be connected.
  2. The soft starting circuit 2. Five-level converter DC side according to claim 1 charges, which is characterized in that five electricity The flat single-phase bridge arm of current transformer is one or more.
  3. The soft starting circuit 3. Five-level converter DC side according to claim 1 charges, which is characterized in that five electricity The flat single-phase bridge arm topological structure of current transformer are as follows: DC side respectively with Up Highway UHW capacitor CUPUpper end and Down Highway capacitor CDOWNUnder End connection is equipped with a flying capacitor C close to exchange side one endf；The positive and negative anodes of DC side pass through main switch S respectively5It is opened with master Close pipe S7It is connected with the positive and negative anodes of flying capacitor；DC side midpoint passes through control switching tube S entirely respectively6, full control switching tube S8, it is inverse Resistance type controls switching tube S entirely4, inverse-impedance type control switching tube S entirely3And two diodes and flying capacitor CfPositive and negative anodes be connected；It suspends Capacitor CfPositive and negative anodes with exchange between the output of side respectively by full-controlled switch pipe S1, full-controlled switch pipe S2It is connected.
  4. The soft starting circuit 4. Five-level converter DC side according to claim 3 charges, which is characterized in that the master opens Close pipe S5With main switch S7It is full-controlled switch pipe.
  5. The soft starting circuit 5. Five-level converter DC side according to any one of claim 1 to 4 charges, feature exist In further including output inductor L, the output end of the single-phase bridge arm of Five-level converter is connected with output inductor L.
  6. 6. a kind of soft-start method of Five-level converter DC side charging soft starting circuit as claimed in claim 3, feature It is, comprising the following steps:
    Step S01: Up Highway UHW capacitor CUPWith Down Highway capacitor CDOWNIt is zero, flying capacitor CfVoltage is zero, switch K1 and switch K2 is disconnected, and Five-level converter is in shutdown status；At this point, closure main switch pipe S5With main switch S7, and closure switch K2 gives Up Highway UHW capacitor C by current-limiting resistance R1 by DC side power supplyUP, Down Highway capacitor CDOWNWith flying capacitor CfCharging, point Piezoresistance R2 and divider resistance R3 equilibrium Up Highway UHW capacitor CUPWith Down Highway capacitor CDOWNVoltage；
    Step S02: as flying capacitor CfVoltage reaches setting value E, and wherein E indicates a quarter of total busbar voltage setting value, breaks Open main switch S5With main switch S7, Up Highway UHW capacitor C is given by current-limiting resistance R1 by DC side power supplyUPWith Down Highway capacitor CDOWNCharging, divider resistance R2 and divider resistance R3 equilibrium Up Highway UHW capacitor CUPWith Down Highway capacitor CDOWNVoltage；
    Step S03: as Up Highway UHW capacitor CUPWith Down Highway capacitor CDOWNVoltage reaches setting value 2E, i.e., the two of busbar voltage/ For the moment, closure switch K1, Five-level converter are in standby.
  7. 7. the soft-start method of Five-level converter DC side charging soft starting circuit according to claim 6, feature It is, passes through main switch S5With main switch S7By flying capacitor CfWith Up Highway UHW capacitor CUPWith Down Highway capacitor CDOWNParallel connection, Make flying capacitor CfWith Up Highway UHW capacitor CUPWith Down Highway capacitor CDOWNSimultaneously by DC side power source charges.
  8. 8. the soft-start method of Five-level converter DC side charging soft starting circuit according to claim 6 or 7, special Sign is, by main switch S5With main switch S7Control, realize flying capacitor CfVoltage first is in Up Highway UHW capacitor CUP With Down Highway capacitor CDOWNVoltage reaches its setting value, makes main switch S5With main switch S7Voltage stress be not higher than bus 3/4ths of voltage, full-controlled switch pipe S1, full-controlled switch pipe S2, inverse-impedance type control switching tube S entirely3, inverse-impedance type control switch entirely Pipe S4, full control switching tube S6, full control switching tube S8Voltage stress be not higher than a quarter of busbar voltage.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110557011A (en) * 2019-09-09 2019-12-10 西南交通大学 LLC system of AC/DC hybrid power distribution network and resonance parameter calculation method thereof
CN111342432A (en) * 2020-02-25 2020-06-26 深圳市禾望科技有限公司 Photovoltaic inverter main circuit
EP3934044A1 (en) * 2020-06-30 2022-01-05 Eaton Intelligent Power Limited Arrangement, circuit breaker and precharging device for a dc power network

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102237672A (en) * 2010-04-30 2011-11-09 通用电气公司 System and method for protection of a multilevel converter
CN103797702A (en) * 2012-01-13 2014-05-14 富士电机株式会社 Multilevel power conversion circuit
CN104242625A (en) * 2014-09-26 2014-12-24 徐州中矿大传动与自动化有限公司 Five-level frequency converter precharging device, control device and control method
US9559541B2 (en) * 2015-01-15 2017-01-31 Rockwell Automation Technologies, Inc. Modular multilevel converter and charging circuit therefor
CN107070276A (en) * 2017-04-20 2017-08-18 上海交通大学 Active neutral point clamp Five-level converter DC side charging soft starting circuit and method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102237672A (en) * 2010-04-30 2011-11-09 通用电气公司 System and method for protection of a multilevel converter
CN103797702A (en) * 2012-01-13 2014-05-14 富士电机株式会社 Multilevel power conversion circuit
CN104242625A (en) * 2014-09-26 2014-12-24 徐州中矿大传动与自动化有限公司 Five-level frequency converter precharging device, control device and control method
US9559541B2 (en) * 2015-01-15 2017-01-31 Rockwell Automation Technologies, Inc. Modular multilevel converter and charging circuit therefor
CN107070276A (en) * 2017-04-20 2017-08-18 上海交通大学 Active neutral point clamp Five-level converter DC side charging soft starting circuit and method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110557011A (en) * 2019-09-09 2019-12-10 西南交通大学 LLC system of AC/DC hybrid power distribution network and resonance parameter calculation method thereof
CN110557011B (en) * 2019-09-09 2021-03-16 西南交通大学 LLC system resonance parameter calculation method for AC/DC hybrid power distribution network
CN111342432A (en) * 2020-02-25 2020-06-26 深圳市禾望科技有限公司 Photovoltaic inverter main circuit
CN111342432B (en) * 2020-02-25 2022-01-11 深圳市禾望科技有限公司 Photovoltaic inverter main circuit
EP3934044A1 (en) * 2020-06-30 2022-01-05 Eaton Intelligent Power Limited Arrangement, circuit breaker and precharging device for a dc power network

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