CN106300272B - Power unit bypass protection device - Google Patents
Power unit bypass protection device Download PDFInfo
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- CN106300272B CN106300272B CN201510312785.0A CN201510312785A CN106300272B CN 106300272 B CN106300272 B CN 106300272B CN 201510312785 A CN201510312785 A CN 201510312785A CN 106300272 B CN106300272 B CN 106300272B
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Abstract
The invention provides a power unit bypass protection device, which is characterized in that a common mechanical switch is used for replacing a mechanical quick switch of a specific model, thyristors V1 and V2 are arranged, a first voltage division circuit and a second voltage division circuit are arranged, when a power unit fails, a thyristor V3 in the first voltage division circuit is driven to be conducted, a thyristor V1 is controlled to be conducted, or a thyristor V4 in the second voltage division circuit is driven to be conducted, a thyristor V2 is controlled to be conducted, before a switch K2 is really closed, the thyristor V1 or V2 plays a role of short-circuit failure power unit, so that the failure power unit is cut off from a flexible direct current transmission system, and after the switch is really closed, the failure power unit is bypassed by the switch. Because the response time of the thyristor is far shorter than that of a common mechanical switch, the fault response time can be shortened to nanosecond level by using the common mechanical switch, and therefore the problems of difficult component type selection and high cost are solved.
Description
Technical field
The present invention relates to high-power T & D Technology fields, and in particular to a kind of power unit by-pass protective device.
Background technology
Flexible DC power transmission device be it is a kind of ac high voltage high current is converted into DC high voltage high current, and lead to
It crosses overhead line or cable and transmits electric energy at a distance to terminal, DC high voltage high current is finally being converted into High Level AC Voltage
The equipment of energy is equipped the power supply of achievable multiple regions or offshore oil exploitation by flexible straight transmission of electricity, independently can quickly controlled
System transmitted active power and reactive power, significantly enhance the flexibility of transmission of electricity, realize regional power grid interconnection.
Currently, flexible direct current transmission converter valve power cell can be applied in flexible direct current power transmission system, the power
Unit mostly uses half-bridge submodule topological structure, as shown in Figure 1, half-bridge submodule includes：2 switch transistor Ts 1 and T2, respectively with 2
The diode and capacitance C0 of a switching tube reverse parallel connection, the emitter of switch transistor T 1 are connected with the collector of switch transistor T 2, electricity
The both ends for holding C0 are connected with the emitter of the collector of switch transistor T 1 and switch transistor T 2 respectively.
In order to ensure that the reliability of power module and flexible direct current power transmission system, traditional half-bridge submodule pass through in power
Connecting valve K2 is as by-pass switch between the input/output terminal of module, and when power cell fault, system controller passes through control
It makes switch K2 to be closed, the power cell of failure can be cut off from flexible direct current power transmission system.In general, when the response of switch K2
Between be less than or equal to 5ms and can avoid the influence that fault power module run flexible direct current power transmission system, but commonly
The response time of mechanical switch is unable to reach the requirement, therefore, is merely able to select the mechanical high-speed switch of specific model, and state
The inside and outside producer for capableing of manufacturing machine formula high-speed switch is less and expensive, causes project cost higher.
In addition, in order to ensure the reliability of power module and flexible direct current power transmission system, traditional half-bridge submodule is in work(
Afterflow thyristor V1 is connected between the input/output terminal of rate module, when system dc busbar short-circuit failure, system controller is logical
It crosses control flexible direct current power transmission system protection switch to be closed, and controls thyristor V1 conductings, by a part of electricity in switch transistor T 2
Flow point flow to thyristor V1, is burnt to avoid switch transistor T 1 and T2.In general, when the response of flexible direct current power transmission system protection switch
Between be less than or equal to 5ms can avoid the influence that system dc busbar short-circuit failure runs flexible direct current power transmission system, but
Response time of common mechanical switch to be unable to reach the requirement, therefore, be merely able to select specific model it is mechanical quickly
Switch, and the producer for capableing of manufacturing machine formula high-speed switch both at home and abroad is less, and it is expensive, cause project cost higher.
Therefore, there is an urgent need for a kind of power unit by-pass protection schemes, to solve the above technical problems.
Invention content
The present invention aiming at the above shortcomings existing in the prior art, provides a kind of power unit by-pass protective device, to
Solve the problems, such as that existing power unit by-pass protective device components selection is difficult, of high cost.
The present invention is in order to solve the above technical problems, adopt the following technical scheme that：
The present invention provides a kind of power unit by-pass protective device, including system controller and multiple power cells, each work(
Rate unit uses half-bridge submodule topological structure, including is connected in opening between the input terminal and output end of half-bridge submodule in parallel
K2 is closed, each power cell further includes thyristor V1 and V2, and thyristor V1 and V2 are connected in inverse parallel the input in half-bridge submodule
Between end and output end；Wherein, switch K2 uses common mechanical switch；
Each power cell further includes：The first bleeder circuit of draw-out power supply including thyristor V3 and including thyristor V4's
The input terminal of second bleeder circuit, draw-out power supply is connected with the both ends of half-bridge submodule positive and negative direct current busbar, draw-out power supply output
The independent DC power supply of two-way；Wherein, the first DC power supply connects the first bleeder circuit, the second partial pressure of the second DC power supply connection
The output end of circuit, the output end of the first bleeder circuit and the second bleeder circuit is connected with the both ends of thyristor V1 and V2 respectively；
System controller is used for, and when judging power cell fault, is sent and is closed to the switch K2 of fault power unit
Signal is controlled, and trigger signal is sent to the thyristor V1 and V2 of fault power unit；The electric current side of failure judgement power cell
To, and according to the current direction of fault power unit, control thyristor V3 conductings, with the voltage exported according to the first bleeder circuit
Conducting thyristor V1, alternatively, the V4 conductings of control thyristor, with the voltage turn-on thyristor V2 exported according to the second bleeder circuit.
Preferably, in each power cell, the collector of the cathode and half-bridge submodule lower switch pipe in the block of thyristor V1
It is connected, the anode of thyristor V1 is connected with the emitter of half-bridge submodule lower switch pipe in the block；The anode and half-bridge of thyristor V2
The collector of submodule lower switch pipe in the block is connected, the emitter phase of the cathode of thyristor V2 and lower switch pipe in half-bridge submodule
Even；
The system controller is specifically used for, when judging the electric current of fault power unit from the anode and crystalline substance of thyristor V1
When the cathode of brake tube V2 is flowed into and is flowed out from the anode of the cathode of thyristor V1 and thyristor V2, the V3 conductings of control thyristor；When
Judge that the electric current of fault power unit is flowed into from the cathode of thyristor V1 and the anode of thyristor V2 and from the sun of thyristor V1
When the cathode of pole and thyristor V2 flow out, the V4 conductings of control thyristor.
Preferably, the first bleeder circuit further includes resistance R1 and resistance R2, one end of the anode and resistance R1 of thyristor V3
It is connected, the cathode of thyristor V3 is connected with one end of resistance R2, the sun of the connecting pin and thyristor V1 of thyristor V3 and resistance R2
Extremely it is connected, and is connected with the cathode of the second DC power supply, the other end of resistance R1 is connected with the anode of the first DC power supply, resistance
The other end of R2 is connected with the cathode of the first DC power supply, and is connected with the cathode of thyristor V1；
Second bleeder circuit further includes resistance R3 and resistance R4, and the anode of thyristor V4 is connected with one end of resistance R3, brilliant
The cathode of brake tube V4 is connected with one end of resistance R4, and thyristor V4 is connected with the connecting pin of resistance R4 with the anode of thyristor V2,
And be connected with the cathode of the first DC power supply, the other end of resistance R3 is connected with the anode of the second DC power supply, and resistance R4's is another
One end is connected with the cathode of the second DC power supply, and is connected with the cathode of thyristor V2；
The system controller is specifically used for, when judging the electric current of fault power unit from the anode and crystalline substance of thyristor V1
When the cathode of brake tube V2 is flowed into and flowed out from the anode of the cathode of thyristor V1 and thyristor V2, triggering letter is sent to thyristor V3
Number, to control thyristor V3 conductings；When judging the electric current of fault power unit from the cathode of thyristor V1 and thyristor V2
When anode is flowed into and flowed out from the cathode of the anode of thyristor V1 and thyristor V2, trigger signal is sent to thyristor V4, with control
The V4 conductings of combinations brake tube.
Preferably, thyristor V1 and V2 uses common thyristor；
When the electric current of fault power unit is flowed into from the anode of thyristor V1 and the cathode of thyristor V2, in thyristor V1
Before conducting, thyristor V2 is first connected in half-bridge submodule under the action of voltage on lower switch pipe, and by half-bridge submodule
Input terminal and output end between voltage clamp to thyristor V2 on pressure drop on；
When thyristor V3 conductings, and load output voltage and crystalline substance that the voltage on thyristor V1 reaches the first bleeder circuit
When the difference of the pressure drop on brake tube V2, thyristor V1 conductings.
Further, the response time of the switch K2 of each power cell is preset in system controller；
The system controller is additionally operable to, and when judging power cell fault, starts timing, when fault power unit
When the response time of switch K2 reaches, the trigger signal of revocation thyristor V1 and/or V3, alternatively, revocation thyristor V2 and/or V4
Trigger signal；
When reaching the response time, the switch K2 of fault power unit is closed.
Thyristor is arranged by replacing the mechanical high-speed switch of specific model with common mechanical switch K2 in the present invention
V1 and V2, and the first bleeder circuit of setting and the second bleeder circuit pass through driving the first partial pressure electricity when power cell fault
Thyristor V3 conductings in road, control thyristor V1 conductings, alternatively, by driving the thyristor V4 in the second bleeder circuit to lead
Logical, the V2 conductings of control thyristor play short trouble power cell before switch K2 is really closed by thyristor V1 or V2
Effect, to cut off fault power unit from flexible direct current power transmission system, after switch K2 is really closed, then by switch K2
Bypass fault power unit.Since the response time of thyristor is much smaller than the response time of common mechanical switch, use in this way
Failure response time can also be shortened to nanosecond by common mechanical switch, to solve components selection difficulty, cost
High problem.
The present invention also provides a kind of power unit by-pass protective devices, including：Flexible direct current power transmission system protection switchs, is
System controller and multiple power cells, each power cell use half-bridge submodule topological structure, including are connected in half-bridge in parallel
The collection of the cathode and half-bridge submodule lower switch pipe in the block of thyristor V1 between the input terminal and output end of module, thyristor V1
Electrode is connected, and the anode of thyristor V1 is connected with the emitter of half-bridge submodule lower switch pipe in the block, flexible direct current power transmission system
Protection switch uses common mechanical switch；
Each power cell further includes：Draw-out power supply and the first bleeder circuit including thyristor V3, the input of draw-out power supply
End is connected with the both ends of half-bridge submodule positive and negative direct current busbar, and draw-out power supply exports the first DC power supply, and the first DC power supply connects
The first bleeder circuit is connect, the output end of the first bleeder circuit is connected with the both ends of thyristor V1；
System controller is used for, and when judging system dc busbar short-circuit, is protected and is switched to flexible direct current power transmission system
It sends and is closed control signal, and the thyristor V1 of whole power cells sends trigger signal into flexible direct current power transmission system；With
And the V3 conductings of control thyristor, with the voltage turn-on thyristor V1 exported according to the first bleeder circuit.
Further, the first bleeder circuit further includes resistance R1 and resistance R2, the anode of thyristor V3 and the one of resistance R1
End is connected, and the cathode of thyristor V3 is connected with one end of resistance R2, and the connecting pin of thyristor V3 and resistance R2 is with thyristor V1's
Anode is connected, and is connected with the cathode of the second DC power supply, and the other end of resistance R1 is connected with the anode of the first DC power supply, electricity
The other end of resistance R2 is connected with the cathode of the first DC power supply, and is connected with the cathode of thyristor V1；
System controller is specifically used for, and is sent by the thyristor V3 of whole power cells into flexible direct current power transmission system
Trigger signal controls thyristor V3 conductings.
Further, the response time of flexible direct current power transmission system protection switch is preset in system controller；
The system controller is additionally operable to, and when judging system dc busbar short-circuit, starts timing, when flexible direct current is defeated
When the response time of electric system protection switch reaches, the trigger signal of revocation thyristor V1 and/or V3；
When reaching the response time, flexible direct current power transmission system protection switch is closed.
Further, described device further includes that thyristor V2, thyristor V2 and thyristor V1 are connected in inverse parallel in half-bridge
Between the input terminal and output end of submodule, thyristor V1 and V2 use common thyristor；
The system controller is additionally operable to, when judging system dc busbar short-circuit, into flexible direct current power transmission system
The thyristor V2 of whole power cells sends trigger signal.
Preferably, before thyristor V1 conductings, the work of voltages of the thyristor V2 in half-bridge submodule on lower switch pipe
It is first connected with lower, and will be in the pressure drop on the voltage clamp to thyristor V2 between the input terminal and output end of half-bridge submodule；
When thyristor V3 conductings, and load output voltage and crystalline substance that the voltage on thyristor V1 reaches the first bleeder circuit
When the difference of the pressure drop on brake tube V2, thyristor V1 conductings.
The present invention is defeated as flexible direct current by using the mechanical high-speed switch that common mechanical switch replaces specific model
Electric system protection switch, and the first bleeder circuit is set, when system dc busbar short-circuit, by driving in the first bleeder circuit
Thyristor V3 conducting before flexible direct current power transmission system protection switch is really closed, utilized with controlling thyristor V1 conductings
The thyristor V1 of each power cell is by each power unit by-pass, to avoid the member of the power cell in flexible direct current power transmission system
The breakdown damage of device, after flexible direct current power transmission system protection switch is really closed, entire flexible direct current power transmission system is stopped
Machine.
Since the first bleeder circuit is to be connected by its internal thyristor V3, and replace flexible DC power transmission system
That blanket insurance shield switch realizes each power cell of bypass is thyristor V1, and the response time of thyristor V3 and V1 are much smaller than common machine
The response time of tool switch, failure response time can also be shortened to nanosecond using common mechanical switch in this way,
To solve the problems, such as that components selection is difficult, of high cost.
Description of the drawings
Fig. 1 is the topological diagram of the existing half-bridge submodule including bypass protection circuit；
Fig. 2 is flexible direct current power transmission system structural schematic diagram；
Fig. 3 is the first bleeder circuit and the second bleeder circuit figure of the embodiment of the present invention 1；
Fig. 4 is the topology diagram of the power cell of the embodiment of the present invention 1；
Fig. 5 is the topology diagram of the power cell of the embodiment of the present invention 2.
Specific implementation mode
Below in conjunction with the attached drawing in the present invention, clear, complete description is carried out to the technical solution in the present invention, is shown
So, described embodiment is a part of the embodiment of the present invention, instead of all the embodiments.Based on the implementation in the present invention
Example, the every other embodiment that those of ordinary skill in the art are obtained without making creative work all belong to
In the scope of protection of the invention.
Referring to Fig. 2, flexible direct current power transmission system includes being based on modular more concatenated flexible direct current power transmission systems of level
Single-ended converter valve, the single-ended converter valve of flexible direct current power transmission system by tri- phase composition of A, B, C, per mutually by multiple power unit cascades and
At.As shown in Fig. 2, the terminal 1 of the power cell of top layer is connected with the anode of system dc busbar in upper half bridge arm, lower half bridge arm
The terminal 2 of middle bottom power cell is connected with the cathode of system dc busbar.
Embodiment 1
The embodiment of the present invention 1 provides a kind of power unit by-pass protective device, is applied in flexible direct current power transmission system, energy
Enough in power cell failure, quickly by the power unit by-pass of failure.The power unit by-pass protective device is including being
System controller (not being painted in figure) and multiple power cells, multiple power cells are connected according to mode shown in Fig. 2, each power
Unit uses half-bridge submodule topological structure.
Below in conjunction with Fig. 4, the topological structure of the power cell is described in detail.As shown in figure 4, each power cell includes simultaneously
Connection is connected to the switch K2 between the input terminal of half-bridge submodule and output end (i.e. terminal 1 and terminal 2), further includes thyristor V1
And V2, thyristor V1 and V2 are connected in inverse parallel between the input terminal and output end of half-bridge submodule.Wherein, switch K2 is used
Common mechanical switch, common mechanical switch refer to that the response time is the mechanical switch of 50-100ms.
In conjunction with shown in Fig. 3, each power cell further includes：Draw-out power supply 10, the first bleeder circuit 11 and the second bleeder circuit
22, the first bleeder circuit 11 includes thyristor V3, and the second bleeder circuit 22 includes thyristor V4.
As shown in figure 4, the input terminal (terminal 3 ' and terminal 4 ') of draw-out power supply 10 and half-bridge submodule positive and negative direct current busbar
Both ends (terminal 3 and terminal 4) be connected, draw-out power supply 10 export the independent DC power supply of two-way, wherein the first DC power supply
Positive and negative anodes are separately connected the first bleeder circuit 11, and the positive and negative anodes of the second DC power supply are separately connected the second bleeder circuit 22, and first
The output end (terminal 61 and terminal 51) of bleeder circuit 11 and the output end (terminal 52 and terminal 62) of the second bleeder circuit are respectively
It is connected with the both ends of thyristor V1 and V2.It should be noted that the voltage of the first DC power supply positive and negative anodes output is more than thyristor
The forward conduction voltage of V3, to ensure that the first bleeder circuit can effectively be connected；The voltage of second DC power supply positive and negative anodes output
Forward conduction voltage more than thyristor V4, to ensure that the second bleeder circuit can effectively be connected.
It should be noted that the first DC power supply and the second DC power supply are independent from each other two DC power supplies, two
DC power supply altogether, will not form the change of current, therefore, can be by the output end 51 and the second bleeder circuit of the first bleeder circuit 11
22 output end 52 is connected to form terminal 53, and by the output of the output end 61 of the first bleeder circuit 11 and the second bleeder circuit 22
End 62 is connected to form terminal 63.Terminal 53 is connected with the terminal 5 of half-bridge submodule, i.e., terminal 53 connects the conduct of half-bridge submodule
The terminal 1 of input/output terminal, terminal 63 are connected with the terminal 6 of half-bridge submodule, i.e., terminal 63 connects the conduct of half-bridge submodule
The terminal 2 of input/output terminal.And terminal 5 and terminal 53 are separately connected the anode of the cathode and thyristor V2 of thyristor V1, terminal
6 and terminal 63 be separately connected thyristor V1 anode and thyristor V2 cathode.
System controller is used for, and when judging power cell fault, is sent and is closed to the switch K2 of fault power unit
Signal is controlled, and trigger signal is sent to the thyristor V1 and V2 of fault power unit；And the electricity of failure judgement power cell
Direction is flowed, and according to the current direction of fault power unit, control thyristor V3 conductings, to be exported according to the first bleeder circuit 11
Voltage turn-on thyristor V1, alternatively, control thyristor V4 conducting, with voltage turn-on crystalline substance export according to the second bleeder circuit 22
Brake tube V2.
When some power cell fault, the controller meeting reporting system controller in the fault power unit, for example, logical
The status signal reporting system controller for crossing transmission power cell failure, when system controller receives the status signal, you can
The power cell fault is judged, so that it is determined that the power cell that is out of order.When system controller judges go out power cell fault,
It is sent to the switch K2 of fault power unit and is closed control signal, and triggering is sent to the thyristor V1 and V2 of fault power unit
Signal (thyristor V1 and V2 are not operating at this time), since switch K2 is common mechanical switch, the response time is usually hundreds of
Millisecond, therefore, when system controller sends to switch K2 and is closed control signal, switch K2 is simultaneously not closed.
It (is not painted in figure specifically, being provided with bridge arm current sensor on the bridge arm of the half-bridge submodule of each power cell
Show), bridge arm current sensor can detect size and the direction of the electric current for flowing through power cell, and testing result is sent to and is
System controller.Therefore, the testing result that system controller can be sent according to the bridge arm current sensor of fault power unit, sentences
The current direction of the disconnected power cell that is out of order.
The embodiment of the present invention 1 is set by replacing the mechanical high-speed switch of specific model with common mechanical switch K2
It sets thyristor V1 and V2, and the first bleeder circuit of setting and the second bleeder circuit, when power cell fault, passes through driving the
Thyristor V3 conductings in one bleeder circuit, control thyristor V1 conductings, alternatively, by driving the brilliant lock in the second bleeder circuit
Pipe V4 conductings, the V2 conductings of control thyristor.Before switch K2 is really closed, by the conducting of thyristor V1 or V2, short circuit event
Hinder power cell, to cut off fault power unit from flexible direct current power transmission system.After switch K2 is really closed, then by
Switch K2 short trouble power cells.Since the first bleeder circuit and the second bleeder circuit are by its internal thyristor V3
With V4 and be connected, moreover, switch K2 is replaced to realize that bypass fault power unit is thyristor V1 or V2, the response of thyristor
Time is typically nanosecond, is much smaller than the response time (Millisecond) of common mechanical switch, and therefore, power unit by-pass is protected
Failure response time can also be shortened to nanosecond by protection unit using common mechanical switch, without selecting specific model
Mechanical switch, to solve the problems, such as that components selection is difficult, of high cost.
It should be noted that being preset with the response time of the switch K2 of each power cell in system controller, it is preferred that each
The response time all same of the switch K2 of a power cell.Timer, the timing duration of timer are preset in system controller
The as response time of switch K2.
The system controller is additionally operable to, and when judging power cell fault, timer starts timing, works as fault power
When the response time of the switch K2 of unit reaches, timer is reset, and the switch K2 of fault power unit is closed at this time.
Once the switch K2 of fault power unit is closed, just by 2 short circuit of the terminal 1 of fault power unit and terminal, i.e., will
Fault power unit is cut off from entire flexible direct current power transmission system, to avoid fault power unit defeated to entire flexible direct current
Electric system operation has an impact.
Below in conjunction with Fig. 4, the connection relation of thyristor V1 and V2 is described in detail.
As shown in figure 4, in each power cell, the collection of the cathode and half-bridge submodule lower switch pipe T2 in the block of thyristor V1
Electrode is connected, and the anode of thyristor V1 is connected with the emitter of half-bridge submodule lower switch pipe T2 in the block.The anode of thyristor V2
It is connected with the collector of half-bridge submodule lower switch pipe T2 in the block, cathode and the lower switch pipe T2 in half-bridge submodule of thyristor V2
Emitter be connected.
When power cell failure, the current direction of fault power unit can be flowed into from terminal 2, from terminal 1
Outflow, i.e. electric current are flowed into from the cathode of the anode of thyristor V1 and thyristor V2, from the cathode of thyristor V1 and thyristor V2
Anode flows out；The current direction of fault power unit can also be to flow into from terminal 1, flowed out from terminal 2, i.e. electric current is from thyristor
The cathode of V1 and the anode of thyristor V2 flow into, from the cathode outflow of the anode and thyristor V2 of thyristor V1.
The system controller is specifically used for, when judging the electric current of fault power unit from the anode and crystalline substance of thyristor V1
When the cathode of brake tube V2 is flowed into and is flowed out from the anode of the cathode of thyristor V1 and thyristor V2, the V3 conductings of control thyristor, with
The positive drive voltage that can be connected is provided to thyristor V1；When judging the electric current of fault power unit from the cathode of thyristor V1
When flowing into the anode of thyristor V2 and being flowed out from the cathode of the anode of thyristor V1 and thyristor V2, control thyristor V4 is led
It is logical, to provide the positive drive voltage that can be connected to thyristor V2.
Below in conjunction with Fig. 3 and Fig. 4, the structure of the first bleeder circuit and the second bleeder circuit is described in detail.
As shown in figure 4, the first bleeder circuit 11 further includes resistance R1 and resistance R2, the anode of thyristor V3 is with resistance R1's
One end is connected, and the cathode of thyristor V3 is connected with one end of resistance R2, connecting pin and the thyristor V1 of thyristor V3 and resistance R2
Anode be connected, and be connected with the cathode of the second DC power supply, the other end of resistance R1 is connected with the anode of the first DC power supply,
The other end of resistance R2 is connected with the cathode of the first DC power supply, and is connected with the cathode of thyristor V1.
Second bleeder circuit 22 further includes resistance R3 and resistance R4, and the anode of thyristor V4 is connected with one end of resistance R3,
The cathode of thyristor V4 is connected with one end of resistance R4, the connecting pin of thyristor V4 and resistance R4 and the anode phase of thyristor V2
Even, and it is connected with the cathode of the first DC power supply, the other end of resistance R3 is connected with the anode of the second DC power supply, resistance R4's
The other end is connected with the cathode of the second DC power supply, and is connected with the cathode of thyristor V2.
Resistance R1 and resistance R2 in above-mentioned first bleeder circuit 11 can be composed in series by multiple resistance respectively, the second partial pressure
Resistance R3 and resistance R4 in circuit 22 can be composed in series by multiple resistance respectively.
The system controller is specifically used for, when judging the electric current of fault power unit from the anode and crystalline substance of thyristor V1
When the cathode of brake tube V2 is flowed into and flowed out from the anode of the cathode of thyristor V1 and thyristor V2, triggering letter is sent to thyristor V3
Number, to control thyristor V3 conductings；When judging the electric current of fault power unit from the cathode of thyristor V1 and thyristor V2
When anode is flowed into and flowed out from the cathode of the anode of thyristor V1 and thyristor V2, trigger signal is sent to thyristor V4, with control
The V4 conductings of combinations brake tube.
Since the first bleeder circuit 11 connects the first DC power supply, the second bleeder circuit 22 connects the second DC power supply, because
This, is loaded with the voltage forward conduction voltage of thyristor V3 (be more than) on the thyristor V3 in the first bleeder circuit 11, second point
Voltage (the forward conduction voltage for being more than thyristor V4) is loaded on thyristor V4 in volt circuit 22, therefore, once system control
Device processed sends trigger signal to thyristor V3 or V4, and thyristor V3 or V4 can be connected, correspondingly, the first bleeder circuit 11 or the
Two bleeder circuits 22 are connected.
The conducting of the first bleeder circuit is driven by using thyristor V3, alternatively, utilizing thyristor V4 driving the second partial pressure electricity
Road is connected, and fast conducting thyristor V1 or V2 may be implemented, and shortens the bypass response time.
The voltage of first bleeder circuit 11 output is the voltage between terminal 61 and 51, which is constant voltage.The
The voltage of one bleeder circuit 11 output is more than the forward conduction voltage of thyristor V1, is just can guarantee in this way in the first bleeder circuit 11
When conducting, thyristor V1 can be driven to be connected.
The voltage of second bleeder circuit 11 output is the voltage between terminal 52 and 62, which is constant voltage.The
The voltage of two bleeder circuits 22 output is more than the forward conduction voltage of thyristor V2, is just can guarantee in this way in the second bleeder circuit 22
When conducting, thyristor V2 can be driven to be connected.
Preferably, it refers to that forward conduction voltage is 5- that thyristor V1 and V2, which uses common thyristor, common thyristor,
The thyristor of 10V.
It should be noted that the electric current when fault power unit is flowed into from the anode of thyristor V1 and the cathode of thyristor V2
And when being flowed out from the anode of cathode and thyristor V2 from thyristor V1, thyristor V1 needs to be exported according to the first bleeder circuit 11
Voltage could be connected, before thyristor V1 conducting, voltages of the thyristor V2 in half-bridge submodule on lower switch pipe T2
It is first connected under effect, thus extremely by the voltage clamp between the input terminal of half-bridge submodule and output end (i.e. terminal 1 and terminal 2)
In pressure drop on thyristor V2.Since thyristor V2 and V1 are reverse parallel connections, when thyristor V3 conductings, and load in crystalline substance
Voltage on brake tube V1 reach the first bleeder circuit 11 output voltage and the pressure drop on thyristor V2 difference when, thyristor V1 is led
It is logical.
Further, the system controller is additionally operable to, when reaching the response time of the switch K2 of fault power unit,
The trigger signal of thyristor V1 and/or V3 are cancelled, alternatively, the trigger signal of revocation thyristor V2 and/or V4, to ensure thyristor
V1 or V2 shutdowns.It should be noted that even if not cancelling the trigger signal of above-mentioned thyristor, once switch K2 is closed, thyristor
V1 or V2 will not be connected again, and the purpose that system controller cancels the trigger signal of above-mentioned thyristor is, further ensures that crystalline substance
Brake tube V1 or V2 shutdown.
Further, the system controller is additionally operable to, and control signal is closed and to thyristor V1 being sent to switch K2
Before sending trigger signal with V2, envelope wave processing is carried out to the switching tube of fault power unit.
That is, when system controller judges go out power cell fault, first to the switching tube (T1 of fault power unit
And T2) envelope wave processing is carried out, to ensure that half-bridge submodule two switch transistor Ts 1 in the block and T2 stop completely, prevent failure further
Expand, then sent again to the switch K2 of fault power unit and be closed control signal, and to the thyristor V1 of fault power unit
Trigger signal is sent with V2.
Embodiment 2
The embodiment of the present invention 2 provides a kind of power unit by-pass protective device, is applied to flexible DC power transmission shown in Fig. 2
It, can be in system dc busbar short-circuit, quickly by each power unit by-pass in system.The power unit by-pass protective device packet
It includes：Flexible direct current power transmission system protection switch (not being painted in figure), system controller (not being painted in figure) and multiple power cells,
Flexible direct current power transmission system protection switch uses common mechanical switch.Multiple power cells are connected according to mode shown in Fig. 2,
Each power cell uses half-bridge submodule topological structure.
Difference lies in without being arranged switch K2 in each power cell, draw-out power supply can be with for embodiment 2 and embodiment 1
Only export DC power supply (i.e. the first DC power supply) all the way.
Below in conjunction with Fig. 5, the topological structure of the power cell of embodiment 2 is described in detail.As shown in figure 5, each power cell
Including the thyristor V1 being connected in parallel between the input terminal of half-bridge submodule and output end (i.e. terminal 1 and terminal 2), thyristor
The cathode of V1 is connected with the collector of half-bridge submodule lower switch pipe T2 in the block, and the anode and half-bridge submodule of thyristor V1 is in the block
The emitter of lower switch pipe T2 is connected.
Each power cell further includes：Draw-out power supply 10 and the first bleeder circuit 11 including thyristor V3, draw-out power supply 10
Input terminal (terminal 3 ' and terminal 4 ') be connected with the both ends (terminal 3 and terminal 4) of half-bridge submodule positive and negative direct current busbar, take energy
Power supply 10 exports the first DC power supply, and the first DC power supply connects the first bleeder circuit 11, the output end of the first bleeder circuit 11
(terminal 61 and terminal 51) is connected with the both ends of thyristor V1.
System controller is used for, and when judging system dc busbar short-circuit, is protected and is switched to flexible direct current power transmission system
(not being painted in figure), which sends, is closed control signal, and the thyristor V1 of whole power cells is sent into flexible direct current power transmission system
Trigger signal；And the V3 conductings of control thyristor, with the voltage turn-on thyristor V1 exported according to the first bleeder circuit 11.
Specifically, the bridge arm current sensing being arranged on bridge arm of the system controller according to the half-bridge submodule of each power cell
The size that device detected flow through the electric current of power cell judges whether system dc busbar is short-circuit, for example, when flow through each power
When the electric current of unit increases suddenly, system controller can judge system dc busbar short-circuit.
When system controller judges go out system dc busbar short-circuit, protects switch to send to flexible direct current power transmission system and close
Control signal is closed, and the thyristor V1 of whole power cells sends trigger signal into flexible direct current power transmission system, at this time brilliant lock
Pipe V1 is not operating, and since flexible direct current power transmission system protection switch is common mechanical switch, the response time is usually hundreds of
Millisecond, therefore, when system controller protects switch to send and is closed control signal to flexible direct current power transmission system, flexible direct current is defeated
Electric system protection switch is simultaneously not closed.
The embodiment of the present invention 2 is by using common mechanical switch to replace the mechanical high-speed switch of specific model as flexible
DC transmission system protection switch, and the first bleeder circuit is set, when system dc busbar short-circuit, pass through the first partial pressure of driving
Thyristor V3 conductings in circuit are really closed it to control thyristor V1 conductings in flexible direct current power transmission system protection switch
Before, using the thyristor V1 of each power cell by each power unit by-pass, to avoid the power in flexible direct current power transmission system
The breakdown damage of component of unit, after flexible direct current power transmission system protection switch is really closed, entire flexible direct current is defeated
Electric system is shut down.Since the first bleeder circuit is to be connected by its internal thyristor V3, and replace flexible direct current defeated
That electric system protection switch realizes each power cell of bypass is thyristor V1, and the response time of thyristor V3 and V1 are much smaller than common
Mechanical switch response time, failure response time can also be shortened to nanosecond using common mechanical switch in this way,
To solve the problems, such as that components selection is difficult, of high cost.
Timer is preset in system controller, the timing duration of timer is flexible direct current power transmission system protection switch
Response time.When judging system dc busbar short-circuit, the timer starts timing, when flexible direct current power transmission system is protected
When the response time of shield switch reaches, timer is reset, and the switch of flexible direct current power transmission system protection at this time is closed.
Once flexible direct current power transmission system protection switch is closed, just that the terminal 1 of each power cell and terminal 2 is short-circuit,
At this point, electric current flows through the thyristor V1 of each power cell, to by whole power unit by-pass, avoid system dc busbar short
Road has an impact the operation of entire flexible direct current power transmission system.
Below in conjunction with Fig. 5, the structure of the first bleeder circuit is described in detail.As shown in figure 5, the first bleeder circuit 11 further includes
The anode of resistance R1 and resistance R2, thyristor V3 are connected with one end of resistance R1, one end of the cathode and resistance R2 of thyristor V3
It is connected, thyristor V3 is connected with the connecting pin of resistance R2 with the anode of thyristor V1, the other end of resistance R1 and the first direct current
The anode in source is connected, and the other end of resistance R2 is connected with the cathode of the first DC power supply, and is connected with the cathode of thyristor V1.
System controller is specifically used for, and is sent by the thyristor V3 of whole power cells into flexible direct current power transmission system
Trigger signal controls the thyristor V3 conductings of whole power cells in flexible direct current power transmission system.
Since the first bleeder circuit 11 connects the first DC power supply, on the thyristor V3 in the first bleeder circuit 11
It is loaded with voltage (the forward conduction voltage for being more than thyristor V3), therefore, once system controller sends triggering to thyristor V3
Signal, thyristor V3 can be connected, correspondingly, the first bleeder circuit 11 is connected.
The voltage of first bleeder circuit 11 output is the voltage between terminal 61 and 51, which is constant voltage.The
The voltage of one bleeder circuit 11 output is more than the forward conduction voltage of thyristor V1, is just can guarantee in this way in the first bleeder circuit 11
When conducting, thyristor V1 can be driven to be connected.
The conducting of the first bleeder circuit is driven by using thyristor V3, is driven to provide the forward direction that can be connected to thyristor V1
Dynamic voltage, may be implemented fast conducting thyristor V1, shorten the bypass response time.
Further, the power unit by-pass protective device can also include thyristor V2, thyristor V2 and thyristor
V1 is connected in inverse parallel between the input terminal and output end (i.e. terminal 1 and terminal 2) of half-bridge submodule, and thyristor V1 and V2 are adopted
With common thyristor.
The system controller is additionally operable to, when judging system dc busbar short-circuit, into flexible direct current power transmission system
The thyristor V2 of whole power cells sends trigger signal.
That is, when system controller judges go out system dc busbar short-circuit, it is complete into flexible direct current power transmission system
The thyristor V1 and V2 of portion's power cell send trigger signal, and thyristor V1 needs the electricity exported according to the first bleeder circuit 11
Pressure could be connected, and before thyristor V1 conductings, the work of voltages of the thyristor V2 in half-bridge submodule on lower switch pipe T2
It is first connected with lower, thus by the voltage clamp between the input terminal of half-bridge submodule and output end (i.e. terminal 1 and terminal 2) to crystalline substance
In pressure drop on brake tube V2.Since thyristor V2 and V1 are reverse parallel connections, when thyristor V3 conductings, and load in brilliant lock
Voltage on pipe V1 reach the first bleeder circuit 11 output voltage and the pressure drop on thyristor V2 difference when, thyristor V1 is led
It is logical.
Role is thyristor V2 in example 2, will be between the input terminal and output end of half-bridge submodule
In pressure drop on voltage clamp to thyristor V2, so that thyristor V1 is smoothly connected.
In order to make thyristor V1 smoothly be connected, be typically selected to have in existing power unit by-pass protective device compared with
The thyristor (thyristor customized) of small conducting voltage, and the conducting voltage of triode thyristor is larger, can not use, therefore,
It is merely able to select the thyristor of specific model, type selecting difficult, expensive.And the present invention by be arranged common thyristor V1 and
V2, by the pressure drop on the voltage clamp on thyristor V1 to thyristor V2, brilliant lock can be realized in the thyristor V1 without customization
The smooth conducting of pipe V1.
Further, the system controller is additionally operable to, and is arrived when the response time of flexible direct current power transmission system protection switch
Up to when, the trigger signal of revocation thyristor V1 and/or V3, to ensure thyristor V1 shutdowns.It should be noted that even if not cancelling
The trigger signal of thyristor V1, once flexible direct current power transmission system protection switch is closed, thyristor V1 will not be connected again, system
The purpose of the trigger signal of controller revocation thyristor V1 and/or V3 is, further ensures that thyristor V1 shutdowns.
Further, the system controller is additionally operable to, and control is closed protecting switch to send to flexible direct current power transmission system
Signal processed and before the thyristor V1 of whole power cells sends trigger signal into flexible direct current power transmission system, to flexible direct current
The switching tube (T1 and T2) of whole power cells in transmission system carries out envelope wave processing.
Certainly, skilled person will appreciate that, the topological structure of the power cell of embodiment 1 may be used (i.e. shown in Fig. 4
Topological structure), and using system controller realize power cell fault when it is straight to the bypass of fault power unit and system
When flowing busbar short-circuit, the bypass to whole power cells.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, however the present invention is not limited thereto.For those skilled in the art, in the essence for not departing from the present invention
In the case of refreshing and essence, various changes and modifications can be made therein, these variations and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a kind of power unit by-pass protective device, including system controller and multiple power cells, each power cell is using half
Bridge submodule topological structure, including the switch K2 that is connected in parallel between the input terminal and output end of half-bridge submodule, feature
It is, each power cell further includes thyristor V1 and V2, and thyristor V1 and V2 are connected in inverse parallel the input in half-bridge submodule
Between end and output end；Wherein, switch K2 uses common mechanical switch；
Each power cell further includes：The first bleeder circuit of draw-out power supply including thyristor V3 and include the second of thyristor V4
The input terminal of bleeder circuit, draw-out power supply is connected with the both ends of half-bridge submodule positive and negative direct current busbar, and draw-out power supply exports two-way
Independent DC power supply；Wherein, the first DC power supply connects the first bleeder circuit, the second DC power supply connection the second partial pressure electricity
The output end of road, the output end of the first bleeder circuit and the second bleeder circuit is connected with the both ends of thyristor V1 and V2 respectively；
System controller is used for, and when judging power cell fault, is sent to the switch K2 of fault power unit and is closed control
Signal, and send thyristor from trigger signal to fault power unit V1 and V2；The current direction of failure judgement power cell, and
According to the current direction of fault power unit, control thyristor V3 conductings, with the voltage turn-on exported according to the first bleeder circuit
Thyristor V1, alternatively, the V4 conductings of control thyristor, with the voltage turn-on thyristor V2 exported according to the second bleeder circuit.
2. device as described in claim 1, which is characterized in that in each power cell, cathode and half-bridge of thyristor V1
The collector of mould lower switch pipe in the block is connected, the emitter phase of the anode and half-bridge submodule lower switch pipe in the block of thyristor V1
Even；The anode of thyristor V2 is connected with the collector of half-bridge submodule lower switch pipe in the block, cathode and half-bridge of thyristor V2
The emitter of lower switch pipe is connected in module；
The system controller is specifically used for, when judging the electric current of fault power unit from the anode and thyristor of thyristor V1
When the cathode of V2 is flowed into and is flowed out from the anode of the cathode of thyristor V1 and thyristor V2, the V3 conductings of control thyristor；Work as judgement
Be out of order power cell electric current flowed into from the anode of the cathode of thyristor V1 and thyristor V2 and from the anode of thyristor V1 and
When the cathode outflow of thyristor V2, the V4 conductings of control thyristor.
3. device as claimed in claim 2, which is characterized in that the first bleeder circuit further includes resistance R1 and resistance R2, brilliant lock
The anode of pipe V3 is connected with one end of resistance R1, and the cathode of thyristor V3 is connected with one end of resistance R2, thyristor V3 and resistance
The connecting pin of R2 is connected with the anode of thyristor V1, and is connected with the cathode of the second DC power supply, the other end of resistance R1 and
The anode of one DC power supply is connected, and the other end of resistance R2 is connected with the cathode of the first DC power supply, and with the moon of thyristor V1
Extremely it is connected；
Second bleeder circuit further includes resistance R3 and resistance R4, and the anode of thyristor V4 is connected with one end of resistance R3, thyristor
The cathode of V4 is connected with one end of resistance R4, and thyristor V4 is connected with the connecting pin of resistance R4 with the anode of thyristor V2, and with
The cathode of first DC power supply is connected, and the other end of resistance R3 is connected with the anode of the second DC power supply, the other end of resistance R4
It is connected with the cathode of the second DC power supply, and is connected with the cathode of thyristor V2；
The system controller is specifically used for, when judging the electric current of fault power unit from the anode and thyristor of thyristor V1
When the cathode of V2 is flowed into and flowed out from the anode of the cathode of thyristor V1 and thyristor V2, trigger signal is sent to thyristor V3,
To control thyristor V3 conductings；When judging the anode of the electric current of fault power unit from the cathode and thyristor V2 of thyristor V1
When flowing into and being flowed out from the cathode of the anode of thyristor V1 and thyristor V2, trigger signal is sent to thyristor V4, to control crystalline substance
Brake tube V4 conductings.
4. device as claimed in claim 3, which is characterized in that thyristor V1 and V2 use common thyristor；
When the electric current of fault power unit is flowed into from the anode of thyristor V1 and the cathode of thyristor V2, be connected in thyristor V1
Before, thyristor V2 is first connected in half-bridge submodule under the action of voltage on lower switch pipe, and by the defeated of half-bridge submodule
Enter in the pressure drop on the voltage clamp to thyristor V2 between end and output end；
When thyristor V3 conductings, and load output voltage and thyristor that the voltage on thyristor V1 reaches the first bleeder circuit
When the difference of the pressure drop on V2, thyristor V1 conductings.
5. device as claimed in claim 3, which is characterized in that be preset with the switch K2's of each power cell in system controller
Response time；
The system controller is additionally operable to, and when judging power cell fault, starts timing, when the switch of fault power unit
When the response time of K2 reaches, the trigger signal of revocation thyristor V1 and/or V3, alternatively, revocation thyristor V2's and/or V4 touches
It signals；
When reaching the response time, the switch K2 of fault power unit is closed.
6. a kind of power unit by-pass protective device, including：Flexible direct current power transmission system protection switch, system controller and multiple
Power cell, each power cell use half-bridge submodule topological structure, including be connected in parallel half-bridge submodule input terminal and
The cathode of thyristor V1 between output end, thyristor V1 are connected with the collector of half-bridge submodule lower switch pipe in the block, brilliant lock
The anode of pipe V1 is connected with the emitter of half-bridge submodule lower switch pipe in the block, which is characterized in that flexible direct current power transmission system is protected
Shield switch uses common mechanical switch；
Each power cell further includes：Draw-out power supply and the first bleeder circuit including thyristor V3, the input terminal of draw-out power supply with
The both ends of half-bridge submodule positive and negative direct current busbar are connected, and draw-out power supply exports the first DC power supply, the first DC power supply connection the
The output end of one bleeder circuit, the first bleeder circuit is connected with the both ends of thyristor V1；
System controller is used for, and when judging system dc busbar short-circuit, protects switch to send to flexible direct current power transmission system
It is closed control signal, and the thyristor V1 of whole power cells sends trigger signal into flexible direct current power transmission system；And control
Combinations brake tube V3 conductings, with the voltage turn-on thyristor V1 exported according to the first bleeder circuit.
7. device as claimed in claim 6, which is characterized in that the first bleeder circuit further includes resistance R1 and resistance R2, brilliant lock
The anode of pipe V3 is connected with one end of resistance R1, and the cathode of thyristor V3 is connected with one end of resistance R2, thyristor V3 and resistance
The connecting pin of R2 is connected with the anode of thyristor V1, and the other end of resistance R1 is connected with the anode of the first DC power supply, resistance R2
The other end be connected with the cathode of the first DC power supply, and be connected with the cathode of thyristor V1；
System controller is specifically used for, and triggering is sent by the thyristor V3 of whole power cells into flexible direct current power transmission system
Signal controls thyristor V3 conductings.
8. device as claimed in claim 7, which is characterized in that be preset with flexible direct current power transmission system protection in system controller
The response time of switch；
The system controller is additionally operable to, and when judging system dc busbar short-circuit, starts timing, when flexible DC power transmission system
When the response time of blanket insurance shield switch reaches, the trigger signal of revocation thyristor V1 and/or V3；
When reaching the response time, flexible direct current power transmission system protection switch is closed.
9. device as claimed in claim 6, which is characterized in that described device further includes thyristor V2, thyristor V2 and brilliant lock
Pipe V1 is connected in inverse parallel between the input terminal and output end of half-bridge submodule, and thyristor V1 and V2 are using common brilliant lock
Pipe；
The system controller is additionally operable to, when judging system dc busbar short-circuit, all into flexible direct current power transmission system
The thyristor V2 of power cell sends trigger signal.
10. device as claimed in claim 9, which is characterized in that before thyristor V1 conductings, thyristor V2 is in half-bridge submodule
It is first connected under the action of voltage in block on lower switch pipe, and by the voltage clamp between the input terminal and output end of half-bridge submodule
In position to the pressure drop on thyristor V2；
When thyristor V3 conductings, and load output voltage and thyristor that the voltage on thyristor V1 reaches the first bleeder circuit
When the difference of the pressure drop on V2, thyristor V1 conductings.
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| CN109599883A (en) * | 2018-11-15 | 2019-04-09 | 许继集团有限公司 | A kind of MMC, MMC submodule and MMC submodule bypass protection method |
| CN111030493B (en) * | 2019-12-31 | 2023-06-23 | 中国南方电网有限责任公司超高压输电公司 | Submodule of modularized multi-level converter and protection circuit thereof |
| CN111313371A (en) * | 2020-03-04 | 2020-06-19 | 南京南瑞继保工程技术有限公司 | Bypass protection method for cascade power module |
| CN117176121B (en) * | 2023-11-02 | 2024-02-23 | 成都沃飞天驭科技有限公司 | Electronic switch driving circuit, control method and electric aircraft |
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