CN108448537A - Protect equipment, protection control method and modular multi-level converter - Google Patents

Protect equipment, protection control method and modular multi-level converter Download PDF

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Publication number
CN108448537A
CN108448537A CN201810167168.XA CN201810167168A CN108448537A CN 108448537 A CN108448537 A CN 108448537A CN 201810167168 A CN201810167168 A CN 201810167168A CN 108448537 A CN108448537 A CN 108448537A
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CN
China
Prior art keywords
current
direct
module
fastp
control unit
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Granted
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CN201810167168.XA
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Chinese (zh)
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CN108448537B (en
Inventor
符松格
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Beijing Etechwin Electric Co Ltd
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Beijing Etechwin Electric Co Ltd
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Priority to CN201810167168.XA priority Critical patent/CN108448537B/en
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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48Conversion 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
    • H02M7/483Converters with outputs that each can have more than two voltages levels
    • H02M7/487Neutral point clamped inverters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/122Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
    • H02H7/1225Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters responsive to internal faults, e.g. shoot-through
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/32Means for protecting converters other than automatic disconnection
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M5/00Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/4585Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48Conversion 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
    • H02M7/483Converters with outputs that each can have more than two voltages levels
    • H02M7/4835

Abstract

The embodiment of the invention discloses a kind of protection equipment, protection control method and modular multi-level converter, the equipment to include:Multiple protective devices and controller;Each protective device includes:N number of capacitor, N number of direct-current short circuit control unit and N+1 fastp-acting fuse;Fastp-acting fuse is connected between DC bus and DC convergent current bus bar;Controller is connected with the direct-current short circuit control unit in each protective device respectively, and for controlling the conducting of direct-current short circuit control unit, the Multilevel Inverters module of power semiconductor short trouble does not occur with protection.Fastp-acting fuse is not connected in circuit, only by very small power-balance electric current, not by operating current, without carrying out Cooling Design to fastp-acting fuse;And failure propagation can be prevented, ensures the current transformer normal operation not broken down;The generation that security risk can also be reduced, improves safety.

Description

Protect equipment, protection control method and modular multi-level converter
Technical field
The present invention relates to a kind of electric circuit electronics technical technical field more particularly to protection equipment, protection control method and modularizations Multilevel Inverters.
Background technology
Current transformer is the voltage for making power-supply system, frequency, the number of phases and other electricity or the changed electrical equipment of characteristic. In order to solve the problems, such as that the grid-connected high current of current transformer, current transformer generally meet the high current requirement of current transformer using parallel way.
Current transformer parallel way is mainly:The DC bus of current transformer is connected in parallel, and ac output end is also connected in parallel on one It rises, each current transformer is controlled using synchronized-pulse control mode.
When short trouble occurs for a current transformer in current transformer in parallel, need quickly to remove the unsteady flow to break down Device prevents failure propagation, influences the operation of other current transformers.
In order to protect current transformer, the DC side for being typically employed in parallel branch increases fastp-acting fuse, by fastp-acting fuse It connects in circuit and works.Fig. 1 is topological schematic diagram of the current transformer with DC fast speed fuse in the prior art.Wherein, Fig. 1 Middle S1 to S6 is power semiconductor, and 1 and 2 be fastp-acting fuse, and DC+ is positive direct-current busbar, and DC- is negative DC bus.When When the short trouble of current transformer occurs, the accumulation of heat fusing fastp-acting fuse 1 and 2 of the short circuit current of DC side ensures simultaneously When normal work, the accumulation of heat of fastp-acting fuse does not malfunction.
It adopts in manner just described, fastp-acting fuse 1 and 2 connects in circuit and works always, and fastp-acting fuse persistently leads to Overcurrent simultaneously generates loss, when operating ambient temperature is higher, needs additionally to carry out Cooling Design to fastp-acting fuse, and fast Fast fuse type selecting is more difficult.
In addition, when short trouble occurs for a power semiconductor S1 in current transformer, DC side can't be caused Short circuit, and then the fastp-acting fuse that cannot fuse, protecting effect are poor.It is needed at this time by failure propagation, breakdown is connected with S1 Power semiconductor S2, make the short circuit simultaneously of concatenated two power semiconductors, can just ensure that fastp-acting fuse is molten It is disconnected.By failure propagation, security risk is will produce, is easy to happen safety accident.
Invention content
A kind of protection equipment of offer of the embodiment of the present invention and its protection control method.
On the one hand, an embodiment of the present invention provides a kind of protection equipment, are used for modular multi-level converter, protect equipment Including:Multiple protective devices and controller;
Each protective device includes:N number of capacitor, N number of direct-current short circuit control unit and N+1 fastp-acting fuse, N are not Positive integer less than 1;
N number of capacitor is series between positive direct-current busbar and negative DC bus;
Each capacitor in N number of capacitor respectively with a direct-current short circuit control in N number of direct-current short circuit control unit Unit processed is in parallel;
Positive direct-current busbar passes through first fastp-acting fuse and positive direct-current bus rod phase in N+1 fastp-acting fuse Even;
Negative DC bus passes through the N+1 fastp-acting fuse in N+1 fastp-acting fuse and negative DC convergent current bus bar phase Even;
I-th of capacitor and the concatenated node of i+1 capacitor are fast by the i+1 in N+1 fastp-acting fuse Fast fuse is connected with i-th of DC convergent current bus bar, 1≤i≤N-1;
Controller is connected with the direct-current short circuit control unit in each protective device respectively, for controlling and occurring short-circuit event With protection power half does not occur for the direct-current short circuit control unit conducting in the protective device of the Multilevel Inverters module connection of barrier The Multilevel Inverters module of conductor device short trouble.
In one embodiment of the invention, direct-current short circuit control unit, including:Controlled thyristor;
It is connected with the anode of controlled thyristor with the anode of the capacitor of direct-current short circuit control unit parallel connection;
It is connected with the cathode of controlled thyristor with the cathode of capacitor of direct-current short circuit control unit parallel connection;
The control pole of controlled thyristor is connected with controller.
In one embodiment of the invention, direct-current short circuit control unit, including:Controlled thyristor and reactor;
Controlled thyristor and reactor series connection;
The control pole of controlled thyristor is connected with controller.
In one embodiment of the invention, controller includes:
Detection module, for determining that short trouble occurs for Multilevel Inverters mould power semiconductor in the block;
Control module, for control and occur short trouble Multilevel Inverters module connect protective device in it is straight Flow short-circuit control unit is connected.
In one embodiment of the invention, control module is specifically used for:
The location of the power semiconductor of short trouble, control and more level that short trouble occurs occur for analysis Converter module connection protective device in, direct-current short circuit control unit corresponding with position be connected.
In one embodiment of the invention, detection module is additionally operable to:
Detect the molten of the fastp-acting fuse in the protective device being connect with the Multilevel Inverters module that short trouble occurs Disconnected state;
Control module is additionally operable to:
If fastp-acting fuse is in blown state, controls and connect with the Multilevel Inverters module that short trouble occurs Contactor disconnect..
On the other hand, an embodiment of the present invention provides a kind of protection control methods, are applied to provided in an embodiment of the present invention Protect equipment.Method includes:
Controller determines that short trouble occurs for Multilevel Inverters mould power semiconductor in the block;
Controller controls the direct-current short circuit in the protective device being connect with the Multilevel Inverters module that short trouble occurs Control unit is connected, and the Multilevel Inverters module of power semiconductor short trouble does not occur with protection.
In one embodiment of the invention, controller control is connect with the Multilevel Inverters module that short trouble occurs Protective device in direct-current short circuit control unit conducting, including:
The location of the power semiconductor of short trouble, control and generation short trouble occur for controller analysis Multilevel Inverters module connection protective device in, direct-current short circuit control unit corresponding with position be connected.
In one embodiment of the invention, method further includes:
Controller detects the quick fuse in the protective device being connect with the Multilevel Inverters module that short trouble occurs The blown state of device;
If detecting, fastp-acting fuse is in blown state, control and the Multilevel Inverters mould that short trouble occurs The contactor of block connection disconnects.
In another aspect, the embodiment of the present invention provides a kind of modular multi-level converter, including the embodiment of the present invention provides Protection equipment.
The protection equipment of the embodiment of the present invention protects control method and modular multi-level converter, fastp-acting fuse not to have Have series connection in circuit, only by very small power-balance electric current, not by operating current, without to fastp-acting fuse into Row Cooling Design;And failure propagation can be prevented, ensures the current transformer normal operation not broken down.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, will make below to required in the embodiment of the present invention Attached drawing is briefly described, for those of ordinary skill in the art, without creative efforts, also It can be obtain other attached drawings according to these attached drawings.
Fig. 1 shows topological schematic diagram of the current transformer with DC fast speed fuse in the prior art;
Fig. 2 shows the structural schematic diagrams of protection equipment provided in an embodiment of the present invention;
Fig. 3 shows the topology of the three level wind electric converter of modularization of protection equipment based on the embodiment of the present invention Schematic diagram;
Fig. 4 shows a kind of topological schematic diagram of Multilevel Inverters module provided in an embodiment of the present invention;
Fig. 5 shows the process schematic of protection module Multilevel Inverters;
Fig. 6 shows the flow diagram of protection control method provided in an embodiment of the present invention.
Specific implementation mode
The feature and exemplary embodiment of various aspects of the invention is described more fully below, in order to make the mesh of the present invention , technical solution and advantage be more clearly understood, with reference to the accompanying drawings and embodiments, the present invention is further retouched in detail It states.It should be understood that specific embodiment described herein is only configured to explain the present invention, it is not configured as limiting the present invention. To those skilled in the art, the present invention can be real in the case of some details in not needing these details It applies.Below to the description of embodiment just for the sake of by showing that the example of the present invention is better understood from the present invention to provide.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those Element, but also include other elements that are not explicitly listed, or further include for this process, method, article or equipment Intrinsic element.In the absence of more restrictions, the element limited by sentence " including ... ", it is not excluded that including There is also other identical elements in the process, method, article or equipment of the element.
An embodiment of the present invention provides a kind of protection equipment, are used for modular multi-level converter, which includes: Multiple protective devices and controller;
Each protective device includes:N number of capacitor, N number of direct-current short circuit control unit and N+1 fastp-acting fuse, N are not Positive integer less than 1;
N number of capacitor is series between positive direct-current busbar and negative DC bus;
Each capacitor in N number of capacitor respectively with a direct-current short circuit control in N number of direct-current short circuit control unit Unit processed is in parallel;
Positive direct-current busbar passes through first fastp-acting fuse and positive direct-current bus rod phase in N+1 fastp-acting fuse Even;
Negative DC bus passes through the N+1 fastp-acting fuse in N+1 fastp-acting fuse and negative DC convergent current bus bar phase Even;
I-th of capacitor and the concatenated node of i+1 capacitor are fast by the i+1 in N+1 fastp-acting fuse Fast fuse is connected with i-th of DC convergent current bus bar, 1≤i≤N-1;
Controller is connected with the direct-current short circuit control unit in each protective device respectively, for controlling and occurring short-circuit event With protection power half does not occur for the direct-current short circuit control unit conducting in the protective device of the Multilevel Inverters module connection of barrier The Multilevel Inverters module of conductor device short trouble.
It should be noted that i-th of DC convergent current bus bar is not positive direct-current bus rod, it is not that negative direct current confluence is female yet Line.
Include below two protective devices to protect equipment, each protective device is short including two capacitors, two direct currents It is illustrated for road control unit and three fastp-acting fuses.
Fig. 2 shows the structural schematic diagrams of protection equipment provided in an embodiment of the present invention.Protection equipment 100 include:Two Protective device 11 and controller 12.
Protective device 11 includes:Two capacitors, 101, two direct-current short circuit control units 102 and three fastp-acting fuses 103。
Two capacitors 101 are series between positive direct-current busbar 104 and negative DC bus 105.
Each capacitor 101 is in parallel with a direct-current short circuit control unit 102 respectively.
Positive direct-current busbar 104 is connected by first fastp-acting fuse 103 with positive direct-current bus rod 204.
Negative DC bus 105 is connected by third fastp-acting fuse 103 with negative DC convergent current bus bar 206.
First capacitor 101 and second concatenated node of capacitor are straight by second fastp-acting fuse and first Bus rod 205 is flowed to be connected.
Controller 12 is connected with the direct-current short circuit control unit 102 in protective device 11 respectively, short for controlling and occurring Direct-current short circuit control unit conducting in the protective device of the Multilevel Inverters module connection of road failure, work(does not occur with protection The Multilevel Inverters module of rate semiconductor devices short trouble.
It is understood that the current transformer of the embodiment of the present invention includes but not limited to rectifier, inverter, AC converter And dc chopper.Based on this, the protection equipment of the embodiment of the present invention can be applied to wind power generating set, can also be applied to Photovoltaic generating system can also be applied to energy-storage system etc..
In one embodiment of the invention, direct-current short circuit control unit 102 may include:Controlled thyristor.
It is connected with the anode of controlled thyristor with the anode of the capacitor of direct-current short circuit control unit parallel connection;With direct-current short circuit The cathode of capacitor of control unit parallel connection is connected with the cathode of controlled thyristor;The control pole of controlled thyristor and controller phase Even.
In one embodiment of the invention, direct-current short circuit control unit 102 may include:Controlled thyristor and reactance Device.
Controlled thyristor and reactor series connection;The control pole of controlled thyristor is connected with controller.
If one end of reactor is connected with the anode of controlled thyristor, the other end of reactor and with direct-current short circuit control The anode of the capacitor of unit parallel connection is connected, the cathode of controlled thyristor and the capacitor in parallel with direct-current short circuit control unit Cathode is connected.
If one end of reactor is connected with the cathode of controlled thyristor, the other end of reactor and with direct-current short circuit control The cathode of the capacitor of unit parallel connection is connected, the anode of controlled thyristor and the capacitor in parallel with direct-current short circuit control unit Anode is connected.
In one embodiment of the invention, reactor can be air reactor, and air reactor can limit short circuit Electric current.
Below to protect equipment application to be illustrated for three level wind electric converter of modularization.
Fig. 3 shows the topology of the three level wind electric converter of modularization of protection equipment based on the embodiment of the present invention Schematic diagram.
M is permanent magnet synchronous motor in Fig. 3;201,202 and 203 be respectively frame circuit breaker;204 is female for positive direct-current confluence Line, 205 be neutral point NP DC convergent current bus bars (i.e. first DC convergent current bus bar), and 206 be negative DC convergent current bus bar;211、 212,213 ..., 21N is respectively Multilevel Inverters module, and each Multilevel Inverters module includes rectifier 21 and inversion Device 22 and a protective device 11 for protecting equipment 100.Q11, Q12, Q21, Q22, Q31, Q32 ..., QN1 and QN2 difference For contactor.
Multilevel Inverters module 211, Multilevel Inverters module 212, Multilevel Inverters module 213 ..., it is mostly electric The motor side of flat converter module 21N respectively by contactor Q11, contactor Q21, contactor Q31 ..., contactor QN1 connects It is connected to motor side exchange bus rod.
Motor side exchange bus rod passes through frame circuit breaker 201 and frame circuit breaker 202 and permanent magnet synchronous motor M phases Even.
Multilevel Inverters module 211, Multilevel Inverters module 212, Multilevel Inverters module 213 ..., it is mostly electric The grid side of flat converter module 21N respectively by contactor Q12, contactor Q22, contactor Q32 ..., contactor QN2 connects It is connected to power grid exchange bus rod.
Power grid exchange bus rod is connected by frame circuit breaker 203 with power grid.
For the sake of clarity, be not shown in Fig. 3 protection equipment 100 controller 12 that includes and its in protective device 11 The connecting line of direct-current short circuit control unit 102.
The rectifier 21 of the embodiment of the present invention and/or the topological form of inverter 22 can be diode-clamped, may be used also Think striding capacitance type, can also be cascade connection type.The embodiment of the present invention not to the topological form of Multilevel Inverters module into Row limits.Any possible mode can be applied in the embodiment of the present invention.
Fig. 4 shows a kind of topological schematic diagram of the Multilevel Inverters module of the embodiment of the present invention.Multilevel Inverters Module includes rectifier 21, inverter 22, the protective device 11 and brake unit 23 for protecting equipment 100.
Rectifier 21 includes 12 insulated gate bipolar transistor IGBT modules, respectively IGBT module T1 to IGBT module T12。
The collector of T1, T2 and T3 are connected with positive direct-current busbar respectively.
The emitter of T1 is electrically connected with the L1 phases in the three-phase electricity of the collector of T4, the collector of T7 and input respectively;
The emitter of T2 is electrically connected with the L2 phases in the three-phase electricity of the collector of T5, the collector of T9 and input respectively;
The emitter of T3 is electrically connected with the L3 phases in the three-phase electricity of the collector of T6, the collector of T11 and input respectively;
The emitter of T4, T5 and T6 are connected with negative DC bus respectively.
The emitter of T7, T9 and T11 are connected with the emitter of T8, T10 and T12 respectively.
The collector of T8, T10 and T12 are (i.e. neutral with the tie point of two capacitors C1 and C2 in protective device 11 Point NP) connection.
Inverter 22 includes 12 IGBT modules, respectively IGBT module T15 to IGBT module T26.
The collector of T15, T16 and T17 are connected with positive direct-current busbar respectively.
The emitter of T15 is electrically connected with the U phases in the three-phase electricity of the collector of T18, the collector of T22 and output respectively;
The emitter of T16 is electrically connected with the V phases in the three-phase electricity of the collector of T19, the collector of T24 and output respectively;
The emitter of T17 is electrically connected with the W phases in the three-phase electricity of the collector of T20, the collector of T26 and output respectively;
The emitter of T18, T19 and T20 are connected with negative DC bus respectively.
The emitter of T22, T24 and T26 are connected with the emitter of T21, T23 and T25 respectively.
The collector of T21, T23 and T25 are connect with neutral point NP.
Brake unit 23 includes a braking resistor R and two IGBT modules, and two IGBT modules are respectively:IGBT module T13 to IGBT module T14.
The collector of T13 is connected with positive direct-current busbar.The emitter of T13 is connected with the collector of T14.The emitter of T14 It is connected with negative DC bus.Braking resistor R is in parallel with T14.
Three fastp-acting fuses in protective device 11 are respectively 303,304 and 305, wherein 303 are connected to positive direct-current mother Between line and positive direct-current bus rod 204;304 are connected between neutral point NP and neutral point NP DC convergent current bus bars 205;305 It is connected between negative DC bus and negative DC convergent current bus bar 206.
The direct-current short circuit control unit 102 that protective device 11 includes includes concatenated controlled thyristor 301 and hollow Reactor 306;Another direct-current short circuit control unit 102 includes concatenated controlled thyristor 302 and air reactor 307.
For each converter module, positive direct-current bus rod, NP direct currents are connected to by three fastp-acting fuses respectively Bus rod and negative DC convergent current bus bar.Positive direct-current bus rod, NP DC convergent current bus bars and negative DC convergent current bus bar dynamic are flat Weigh each current transformer DC bus-bar voltage and be consistent.Three fastp-acting fuses of each protection equipment are not connected on electricity Lu Zhong not by operating current, therefore can select the quick fuse of low current only by very small power-balance electric current Device reduces the type selecting difficulty of fastp-acting fuse;In addition the fastp-acting fuse price of low current is relatively low, and then saves cost. And since fastp-acting fuse is not connected in circuit, the loss of fastp-acting fuse when reducing normal work.
In one embodiment of the invention, controller 12 may include:Detection module and control module.
Detection module determines that short trouble occurs for the power semiconductor in rectifier 21 and inverter 22.
Control module controls straight in the protective device being connect with the rectifier 21 and/or inverter 22 that short trouble occurs Flow short-circuit control unit is connected, the protective device connected with the rectifier 21 and/or inverter 22 that fuse and occur short trouble In fastp-acting fuse, the Multilevel Inverters module of power semiconductor short trouble does not occur for protection.
In one embodiment of the invention, control module can analyze the power semiconductor institute that short trouble occurs The position at place controls and the protective device that the modular multi-level converter of short trouble is connect occurs with power semiconductor In, direct-current short circuit control unit corresponding with the position analyzed conducting.
Illustratively, when the power semiconductor that short trouble occurs be at least IGBT module T1, T2 in Fig. 4, T3, When one in T15, T16 and T17, analyzes and the IGBT module of short trouble occurs be located at upper bridge arm, then the controllable crystalline substance lock of control Pipe 301 is closed, and makes to constitute short-circuit loop between positive direct-current busbar and neutral point NP, and fuse fastp-acting fuse 303 and 304.
When the power semiconductor that short trouble occurs be at least IGBT module T4, T5, T6, T18, T19 in Fig. 3 and When any one in T20, analyzes and the IGBT module of short trouble occurs be located at lower bridge arm, then control controlled thyristor 302 Be closed, make it is negative short-circuit loop is constituted between DC bus and neutral point NP, fuse fastp-acting fuse 305 and 304.
When the power semiconductor that short trouble occurs be at least IGBT module T13, T14 in Fig. 4, T7, T8, T9, When one in T10, T11, T12, T21, T22, T23, T24, T25 and T26, the IGBT module position that short trouble occurs is analyzed In zero level bridge arm or brake unit, then controls controlled thyristor 301 and 302 and be closed at, make positive direct-current busbar and neutrality Between point NP, it is negative short-circuit loop is constituted between DC bus and neutral point NP, fuse fastp-acting fuse 303,304 and 305.
When simultaneously short trouble occurs for the IGBT module positioned at upper bridge arm and lower bridge arm, then controlled thyristor 301 is controlled It is closed at, makes between positive direct-current busbar and neutral point NP, negative composition short circuit between DC bus and neutral point NP is returned with 302 Road, fuse fastp-acting fuse 303,304 and 305.
It is right in conjunction with the structure of Fig. 4 hereafter in case of first Multilevel Inverters module breaks down in Fig. 3 The fusing process of fastp-acting fuse 303,304 and 305 illustrates.Consider that Multilevel Inverters module is in commercial application Single Modular cabinet, hereinafter, the meaning of term " module cabinet " is Multilevel Inverters module.
The first state:Controlled thyristor 301 is connected.
As the bridge arm T1, T2, T3 for detecting top half, T15, T16 can be triggered individually after short trouble occurs for T17 Controlled thyristor 301 is connected, and constitutes the short-circuit loop of positive direct-current busbar DC+ to NP.Meanwhile giving 201,202 He of frame circuit breaker 203 send out disjunction instruction, and Q11 to QN1, Q12 to QN2 is kept to be in closed state.At this point, the DC capacitor of all module cabinets The short circuit path that device group can be made up of fastp-acting fuse and 301 first is discharged.When the direct current of DC+ to negative DC bus DC- are female When line voltage is less than uncontrollable commutating DC voltage, fly-wheel diode stream that the three-phase alternating current of pusher side and net side passes through IGBT Enter DC bus, short-circuit loop is then constituted by 301 short circuit path and the capacitance of NP to DC-.IGBT short circuits occur to lose The top half fastp-acting fuse 303 and 304 of the module cabinet of effect carries the discharge current of N-1 times of individual module cabinet The capacitance of only DC+ to NP (discharge), the module cabinet that IGBT short-circuit failures do not occur carry 1 times of individual module cabinet and put Electric current, according to the I of fastp-acting fuse2Fusing rule (square of N-1 times of discharge current, the electric discharge electricity much larger than 1 times of t Square of stream), the module cabinet cognition that IGBT short-circuit failures occur fuses first.When 303 and 304 fastp-acting fuses are any molten When disconnected (two any fusing of fuse on the DC loop of DC+ to NP at this time), the module cabinet of IGBT failure of removal occurs DC side disengaged from DC convergent current bus bar, after 201, the 202 and 203 disjunction alternating short-circuit current of frame circuit breaker, control A.C. contactor Q11 and the Q12 disjunction of device control failed module cabinet processed, the module cabinet entirely to fail is i.e. from electric loop It is separated from completely with other module cabinets.Then, main controller controls frame circuit breaker 201,202 and 203 re-closes, other Module cabinet weight is newly resumed work, and the work of entire auto by pass malfunctioning module cabinet is completed.
Second of state:Controlled thyristor 302 is connected.
As the bridge arm T4, T5, T6 for detecting lower half portion, T18, T19 can control 302 after short trouble occurs for T20 Conducting constitutes the short-circuit loop of NP to DC-.Meanwhile disjunction instruction is sent out to frame circuit breaker 201,202 and 203, keep Q11 It is in closed state to QN1, Q12 to QN2.At this point, the direct current capacitors group of all module cabinets can pass through quick fuse first The short circuit path electric discharge of device and 302 compositions.When the DC bus-bar voltage of DC+ to DC- is less than uncontrollable commutating DC voltage, machine The three-phase alternating current of side and net side flows into DC bus by the fly-wheel diode of IGBT, then by 302 short circuit path And the capacitance of DC+ to NP constitutes short-circuit loop.The lower half portion fastp-acting fuse of the module cabinet of IGBT short-circuit failures occurs 304 and 305 carry the discharge current (capacitance of only NP to DC- discharges) of N-1 times of individual module cabinet, and it is short that IGBT does not occur The module cabinet of road failure carries the discharge current of 1 times of individual module cabinet.According to the I of fastp-acting fuse2The fusing of t is advised Rule (square of N-1 times of discharge current, square of the discharge current much larger than 1 times), occurs the module cabinet of IGBT short-circuit failures Cognition fuses first.(two on the DC loop of NP to DC- at this time when any fusing of 304 and 305 fastp-acting fuses Any fusing of fuse), the DC side that the module cabinet of IGBT failure of removal occurs is disengaged from DC convergent current bus bar, waits until frame After 201,202 and 203 disjunction alternating short-circuit current of frame breaker, controller controls the A.C. contactor Q11 of failed module cabinet With Q12 disjunctions, the module cabinet entirely to fail is separated from other module cabinets completely i.e. from electric loop.Then, master control Device control framework breaker 201,202 and 203 processed re-closes, and other module cabinet weight are newly resumed work, complete it is entire from The work of dynamic bypass malfunctioning module cabinet.
The third state:Controlled thyristor 301 and 302 simultaneously turns on.
Since the three-phase alternating current input side and three-phase alternating current outlet side of current transformer are respectively connected with reactor, and each current transformer DC bus be respectively connected with capacitor group, when individual module cabinet controlled thyristor 301 and 302 be connected when, all modules The short circuit path that the direct current capacitors group of cabinet can be made up of fastp-acting fuse and 301,302 first is discharged.Work as DC bus When voltage is less than uncontrollable commutating DC voltage, the three-phase alternating current of pusher side and net side is flowed by the fly-wheel diode of IGBT Then DC bus constitutes short-circuit loop by 301 and 302 short circuit path.
At this point, the fastp-acting fuse 303 and 305 that the module cabinet of IGBT short-circuit failures occurs carries N-1 times single The discharge current of module cabinet, do not occur IGBT short-circuit failures module cabinet carry 1 times individual module cabinet electric discharge Electric current, according to the I of fastp-acting fuse2(square of N-1 times of discharge current is much larger than 1 times of discharge current to the fusing rule of t Square), occur IGBT short-circuit failures module cabinet cognition fuses first.Fastp-acting fuse 304 is by direction opposite Short circuit current, (after fastp-acting fuse 303 and 305 any fusing, 304 can pass through unidirectional short circuit to size of current basic neutralisation Simultaneously fusing occurs for electric current).After 303 fastp-acting fuses fuse, 304 and 305 fastp-acting fuses continue to carry N-1 The discharge current of individual module cabinet again, (three on DC loop at this time when any fusing of 304 and 305 fastp-acting fuses A fuse at least fuses two), the DC side of the module cabinet of IGBT short-circuit failure failures occurs from DC convergent current bus bar It disengages.After 201,202 and 203 disjunction alternating short-circuit current of frame circuit breaker, controller controls the friendship of failed module cabinet Contactor Q11 and Q12 disjunction is flowed, the module cabinet entirely to fail is detached from other module cabinets completely i.e. from electric loop It opens.Then, main controller controls frame circuit breaker 201,202 and 203 re-closes, and other module cabinet weight are newly resumed work, Complete the work of entire auto by pass malfunctioning module cabinet.
In one embodiment of the invention, power semiconductor includes any one in item set forth below:
Insulated gate bipolar transistor IGBT, integrated gate commutated thyristor IGCT, electron injection enhancement type gate transistors Pipe IEGT, static induction thyristor SITH, power field effect transistor Power MOSFET.
Specifically, detection module, which detects that the power semiconductor in rectifier 21 and inverter 22 enters, moves back saturation work Make area, that is, detect that short trouble occurs for power semiconductor, controller 12 is breaking to frame circuit breaker 201, frame at this time Device 202 and frame circuit breaker 203 send open command;Meanwhile with power semiconductor the mostly electric of short trouble occurs for control Direct-current short circuit control unit 102 in the protective device 11 of flat converter module connection is connected, and constitutes direct-current short circuit access.With molten Fastp-acting fuse in the disconnected protective device being connect with the rectifier 21 and/or inverter 22 that short trouble occurs, protection are not sent out The Multilevel Inverters module of raw power semiconductor short trouble.
Since the three-phase alternating current input side of rectifier 21 and the three-phase alternating current outlet side of inverter 22 are respectively connected with reactor. And the DC bus of each current transformer is respectively connected with capacitor group, the direct current in the protective device 11 in individual module cabinet When fault control unit 102 is connected, the direct current capacitors group of all Modular cabinets can pass through fastp-acting fuse and direct current first The short circuit path that fault control unit 102 is constituted is discharged.
At this point, the fastp-acting fuse in the Modular cabinet of generation power semiconductor short trouble carries N-1 times Modular cabinet discharge current, the fastp-acting fuse in the Modular cabinet of power semiconductor short trouble does not occur According to the fusing rule of fastp-acting fuse power semiconductor occurs for the discharge current that carry 1 times of Modular cabinet short Fastp-acting fuse in the Modular cabinet of road failure can fuse first.
When three fastp-acting fuses 103 all fusing or three fastp-acting fuses 103 only there are one it is unblown when, occur The DC side of the Modular cabinet of power semiconductor short trouble is disengaged from DC convergent current bus bar, and work(does not occur with protection The modular multi-level converter of rate semiconductor devices short trouble.
In one embodiment of the invention, detection module can also detect the three-phase current of current transformer outlet side in real time, When detecting that the three-phase current of output exceeds predetermined current threshold, and detect that the power in rectifier 21 and inverter 22 is partly led Short trouble occurs for body device, and controller 12 is sent out to frame circuit breaker 201, frame circuit breaker 202 and frame circuit breaker 203 at this time Send open command;Meanwhile the guarantor that the modular multi-level converter of short trouble is connect occurs with power semiconductor for control Direct-current short circuit control unit 102 in protection unit 11 is connected, and constitutes direct-current short circuit access.To fuse and occur the whole of short trouble The fastp-acting fuse in the protective device that device 21 and/or inverter 22 connect is flowed, power semiconductor short circuit does not occur for protection The Multilevel Inverters module of failure.
It should be noted that due to frame circuit breaker disjunction actuation time generally 100ms (millisecond, 10-3S) rank, And controlled thyristor actuation time generally 2-10us (microsecond, 10-6S) rank.Therefore after disjunction frame circuit breaker first, There is still a need for controlled thyristor actions to carry out short-circuit DC bus, and normal current transformer is protected to play to fuse parallel fuse The effect of module.
In one embodiment of the invention, detection module can also be detected occurs short trouble with power semiconductor Modular multi-level converter connection protective device in fastp-acting fuse blown state.When detection module detects three A fastp-acting fuse 103 all fusing or three fastp-acting fuses 103 only there are one it is unblown when, control module control and work( The contactor that the modular multi-level converter connection of short trouble occurs for rate semiconductor devices disconnects;Detection and power semiconductor Whether the contactor that the modular multi-level converter connection of short trouble occurs for device disconnects, if having disconnected, re-closes Frame circuit breaker 201, frame circuit breaker 202 and frame circuit breaker 203, whole system is resumed operation again.
Based on foregoing description, the process of the protection module Multilevel Inverters of the embodiment of the present invention is as shown in Figure 5.Fig. 5 Show the process schematic of protection module Multilevel Inverters.Protection module Multilevel Inverters substantially process is as follows:
Whether detection Multilevel Inverters mould power semiconductor in the block occurs short trouble;Detect current transformer output Whether three-phase current exceeds predetermined current threshold.
If detecting, short trouble occurs for power semiconductor, and detects current transformer output three-phase current beyond default Current threshold, disjunction frame circuit breaker.
It controls in the protective device being connect with the Multilevel Inverters module that power semiconductor short trouble occurs Direct-current short circuit control unit is connected, and constitutes direct-current short circuit access.
The fusing of the Multilevel Inverters mould fastp-acting fuse in the block of power semiconductor short trouble occurs for detection State.And the disjunction state of detection framework breaker.
If detecting, the Multilevel Inverters mould fastp-acting fuse in the block that power semiconductor short trouble occurs is complete When portion fuses or is only unblown there are one fastp-acting fuse, and the complete disjunction of frame circuit breaker, disjunction are partly led with power occurs The contactor of the Multilevel Inverters module connection of body shorted devices failure.
Detect the state for the contactor being connect with the Multilevel Inverters module that power semiconductor short trouble occurs.
If detecting at the contactor being connect with the Multilevel Inverters module that power semiconductor short trouble occurs In off-state, then frame circuit breaker is re-closed, whole system is resumed operation again.
The protection equipment of the embodiment of the present invention, fastp-acting fuse are not connected in circuit, and very small power is only passed through Balanced balanced current not by operating current, therefore can select the fastp-acting fuse of low current, reduce the choosing of fastp-acting fuse Type difficulty;In addition the fastp-acting fuse price of low current is relatively low, and then saves cost.And since fastp-acting fuse is not gone here and there Join in circuit, the loss of fastp-acting fuse when reducing normal work.In addition cooling set is carried out without to fastp-acting fuse Meter;And failure propagation can be prevented, ensures the current transformer normal operation not broken down;Security risk can also be reduced Occur, improves safety.
Based on foregoing description, the embodiment of the present invention also provides a kind of protection control method.It should be noted that the present invention is real The protection control method for applying example is preferably applied to protection equipment provided in an embodiment of the present invention.
Fig. 6 shows the flow diagram of protection control method provided in an embodiment of the present invention.This method may include:
S601:Controller determines that short trouble occurs for Multilevel Inverters mould power semiconductor in the block.
S602:Controller controls the direct current in the protective device being connect with the Multilevel Inverters module that short trouble occurs Fault control unit is connected, and the Multilevel Inverters module of power semiconductor short trouble does not occur with protection.
In one embodiment of the invention, more level of short trouble occur with power semiconductor for controller control Direct-current short circuit control unit conducting in the protective device of converter module connection, including:
The location of the power semiconductor of short trouble, control and power semiconductor occur for controller analysis Occur in the protective device of the Multilevel Inverters module connection of short trouble, direct-current short circuit control corresponding with the position analyzed Unit conducting processed.
In one embodiment of the invention, modular multi-level converter guard method can also include:
Controller is detected, and the protection dress that the Multilevel Inverters module of short trouble is connect occurs with power semiconductor The blown state of fastp-acting fuse in setting;
If detecting, fastp-acting fuse is in blown state, and with power semiconductor short trouble occurs for control The contactor of Multilevel Inverters module connection disconnects.
In one embodiment of the invention, power semiconductor includes any one in item set forth below:
Insulated gate bipolar transistor IGBT, integrated gate commutated controlled thyristor IGCT, electron injection enhancement type grid Transistor IEGT, electrostatic induction controlled thyristor SITH, power field effect transistor Power MOSFET.
Each section details of the guard method of the embodiment of the present invention can refer to the embodiment of the present invention that Fig. 2 to Fig. 5 is described The description of equipment, the embodiment of the present invention is protected not to repeat herein it.
The embodiment of the present invention also provides a kind of modular multi-level converter, including protection provided in an embodiment of the present invention is set It is standby.
It should be clear that the invention is not limited in specific configuration described above and shown in figure and processing. For brevity, it is omitted here the detailed description to known method.In the above-described embodiments, several tools have been described and illustrated The step of body, is as example.But procedure of the invention is not limited to described and illustrated specific steps, this field Technical staff can be variously modified, modification and addition after the spirit for understanding the present invention, or suitable between changing the step Sequence.
Functional block shown in structures described above block diagram can be implemented as hardware, software, firmware or their group It closes.When realizing in hardware, it may, for example, be electronic circuit, application-specific integrated circuit (ASIC), firmware appropriate, insert Part, function card etc..When being realized with software mode, element of the invention is used to execute program or the generation of required task Code section.Either code segment can be stored in machine readable media program or the data-signal by being carried in carrier wave is passing Defeated medium or communication links are sent." machine readable media " may include any medium for capableing of storage or transmission information. The example of machine readable media includes electronic circuit, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), soft Disk, CD-ROM, CD, hard disk, fiber medium, radio frequency (RF) link, etc..Code segment can be via such as internet, inline The computer network of net etc. is downloaded.
It should also be noted that, the exemplary embodiment referred in the present invention, is retouched based on a series of step or device State certain methods or system.But the present invention is not limited to the sequence of above-mentioned steps, that is to say, that can be according in embodiment The sequence referred to executes step, may also be distinct from that the sequence in embodiment or several steps are performed simultaneously.
The above description is merely a specific embodiment, it is apparent to those skilled in the art that, For convenience of description and succinctly, the system, module of foregoing description and the specific work process of unit can refer to preceding method Corresponding process in embodiment, details are not described herein.It should be understood that scope of protection of the present invention is not limited thereto, it is any to be familiar with Those skilled in the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or substitutions, These modifications or substitutions should be covered by the protection scope of the present invention.

Claims (10)

1. a kind of protection equipment, it to be used for modular multi-level converter, which is characterized in that the protection equipment includes:Multiple guarantors Protection unit and controller;
Each the protective device includes:N number of capacitor, N number of direct-current short circuit control unit and N+1 fastp-acting fuse, N are not Positive integer less than 1;
N number of capacitor is series between positive direct-current busbar and negative DC bus;
Each capacitor in N number of capacitor is short with a direct current in N number of direct-current short circuit control unit respectively Road control unit is in parallel;
The positive direct-current busbar passes through first fastp-acting fuse and positive direct-current bus rod in the N+1 fastp-acting fuse It is connected;
The negative DC bus is converged by the N+1 fastp-acting fuse in the N+1 fastp-acting fuse with negative direct current female Line is connected;
I-th of capacitor and the concatenated node of i+1 capacitor are fast by the i+1 in the N+1 fastp-acting fuse Fast fuse is connected with i-th of DC convergent current bus bar, 1≤i≤N-1;
The controller is connected with the direct-current short circuit control unit in each protective device respectively, for controlling and occurring short-circuit event With protection power half does not occur for the direct-current short circuit control unit conducting in the protective device of the Multilevel Inverters module connection of barrier The Multilevel Inverters module of conductor device short trouble.
2. protection equipment according to claim 1, which is characterized in that the direct-current short circuit control unit, including:It is controllable brilliant Brake tube;
It is connected with the anode of the controlled thyristor with the anode of the capacitor of the direct-current short circuit control unit parallel connection;
It is connected with the cathode of the controlled thyristor with the cathode of the capacitor of the direct-current short circuit control unit parallel connection;
The control pole of the controlled thyristor is connected with the controller.
3. protection equipment according to claim 1, which is characterized in that the direct-current short circuit control unit, including:It is controllable brilliant Brake tube and reactor;
The controlled thyristor and reactor series connection;
The control pole of the controlled thyristor is connected with the controller.
4. protection equipment according to any one of claims 1 to 3, which is characterized in that the controller includes:
Detection module, for determining that short trouble occurs for Multilevel Inverters mould power semiconductor in the block;
Control module, for control and occur short trouble Multilevel Inverters module connect protective device in direct current it is short Road control unit conducting.
5. protection equipment according to claim 4, which is characterized in that the control module is specifically used for:
The location of the power semiconductor of short trouble, control and more level unsteady flows that short trouble occurs occur for analysis Device module connection protective device in, direct-current short circuit control unit corresponding with the position be connected.
6. protection equipment according to claim 4, which is characterized in that the detection module is additionally operable to:
Detect the fusing shape of the fastp-acting fuse in the protective device being connect with the Multilevel Inverters module that short trouble occurs State;
The control module, is additionally operable to:
If the fastp-acting fuse is in blown state, controls and connect with the Multilevel Inverters module that short trouble occurs Contactor disconnect.
7. a kind of protection control method, which is characterized in that it is applied to claim 1 to 6 any one of them and protects equipment, it is described Method includes:
Controller determines that short trouble occurs for Multilevel Inverters mould power semiconductor in the block;
Controller controls the direct-current short circuit in the protective device being connect with the Multilevel Inverters module that short trouble occurs Control unit is connected, and the Multilevel Inverters module of power semiconductor short trouble does not occur with protection.
8. the method according to the description of claim 7 is characterized in that with described short trouble occur more for controller control Direct-current short circuit control unit conducting in the protective device of level current transformer module connection, including:
The location of the power semiconductor of short trouble occurs for controller analysis, and control is mostly electric with generation short trouble In the protective device of flat converter module connection, direct-current short circuit control unit corresponding with the position is connected.
9. the method according to the description of claim 7 is characterized in that the method further includes:
Controller detects the quick fuse in the protective device being connect with the Multilevel Inverters module that short trouble occurs The blown state of device;
If detecting, the fastp-acting fuse is in blown state, control and more level unsteady flows that short trouble occurs The contactor of device module connection disconnects.
10. a kind of modular multi-level converter, which is characterized in that set including the protection of such as claim 1 to 6 any one of them It is standby.
CN201810167168.XA 2018-02-28 2018-02-28 Protect equipment, protection control method and modular multi-level converter Active CN108448537B (en)

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