CN109861512A - A kind of clamper Shuangzi module with DC Line Fault self-cleaning ability - Google Patents
A kind of clamper Shuangzi module with DC Line Fault self-cleaning ability Download PDFInfo
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- CN109861512A CN109861512A CN201910174612.5A CN201910174612A CN109861512A CN 109861512 A CN109861512 A CN 109861512A CN 201910174612 A CN201910174612 A CN 201910174612A CN 109861512 A CN109861512 A CN 109861512A
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- clamper shuangzi
- shuangzi module
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- line fault
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Abstract
The invention discloses a kind of clamper Shuangzi modules with DC Line Fault self-cleaning ability.Clamper Shuangzi module connects two half-bridge modules by a clamp circuit and forms, and clamp circuit is made of 4 diodes, compared to traditional clamper Shuangzi module, reduces the cost and loss of submodule, and do not need additionally to control.The normal mode of operation of the clamper Shuangzi module proposed is identical as traditional clamper Shuangzi module, but its DC Line Fault isolating power is twice of traditional clamper Shuangzi module, can remove DC side fault current faster, compensates for the deficiency of traditional clamper Shuangzi module.In addition, the clamper Shuangzi module topology proposed has good versatility, other submodules for not having DC Line Fault Scavenging activity can be applied to, make it have DC Line Fault Scavenging activity, ensure the safe and reliable operation of MMC-HVDC system.
Description
Technical field
The invention belongs to flexible DC transmission Modularized multi-level converter sub-module topological structure fields, and in particular to one
Kind has the clamper Shuangzi module (CDSM, clamping double sub-module) of DC Line Fault self-cleaning ability.
Background technique
In recent years, (MMC-HVDC) system of the D.C. high voltage transmission based on modularization multi-level converter is because it is with voltage
Grade is high, and harmonic wave is small, and power quality is high, can be realized active and idle independent decoupling control, it is easy to accomplish multiterminal interconnection etc.
Advantage and become a kind of very promising high pressure long distance power transmission mode, it is relative design, operation and control etc. phases
The problem of pass, also becomes research hotspot, such as the research of submodule and inverter topology, the research of operation stability, and the balance of voltage,
The research such as loop current suppression and fault traversing control, wherein fault traversing control have the safe and reliable operation of MMC-HVDC system
Vital effect.
In the failure of MMC-HVDC system, influence of the dc-side short-circuit fault to system is the most serious.At present for straight
There are three types of the processing methods for flowing side short trouble: first is that disconnecting DC side breaker；Second is that disconnecting exchange side breaker；Third is that adopting
The submodule topology or inverter topology of the faulty self-cleaning ability of apparatus.Conventional method uses first two method, i.e., using friendship
DC current breaker disconnects AC network or DC side failure, but traditional mechanical breaker response is very slow, in addition failure
Detection, judgement be also required to the regular hour, during this period, switching device has little time to be latched, it is still necessary to bear very high electric current
Stress, it is easy to damage switching device, and breaker is at high cost, loss is big.The third method is using inverter itself come real
The self-cleaning of existing DC Line Fault, currently, correlative study there has been certain achievement, especially to DC Line Fault self-cleaning energy
The research of the submodule topology of power, such as full-bridge submodule (FBSM), clamper Shuangzi module (CDSM), three level or five level cross
It interconnects submodule (3/5LCC), and the improvement etc. to FBSM and CDSM.Consider from cost and failure self-cleaning ability integration,
CDSM is a kind of higher submodule topology of cost performance, but when dc-side short-circuit fault occurs, two capacitors in submodule
Parallel connection, as shown in Figure 1, the ability of its isolated DC failure is equal to FBSM.There is document to improve CDSM, increases one
A IGBT anti-paralleled diode, so that improved clamper Shuangzi module is when occurring DC Line Fault, two capacitors of submodule
Series connection, can generate twice of backward voltage and carry out isolated DC failure, but increased IGBT will increase loss and cost.
Summary of the invention
The object of the present invention is to provide a kind of clamper Shuangzi modules, to solve traditional clamper Shuangzi module DC Line Fault certainly
The weaker problem of Scavenging activity, and its operating mode and DC Line Fault self-cleaning ability are analyzed.
Technical solution of the present invention is: a kind of clamper Shuangzi module with DC Line Fault self-cleaning ability,
Including a clamp circuit and two half-bridge submodules, first half-bridge submodule HBSM1Input terminal as clamper Shuangzi mould
The input terminal of block, the capacitor C of first half-bridge submodule1With the A of clamp circuit, the end B is in parallel, the E of clamp circuit, the end F and the
Two half-bridge submodule HBSM2Capacitor C2Parallel connection, output of the input terminal of second half son's bridge module as clamper Shuangzi module
End.
Clamp circuit is by four the 5th diode D of diode5, the 6th diode D6, the 7th diode D7With the 8th diode
D8Composition, is a four-pole network, and bilateral symmetry, each diode two diodes connection direction adjacent thereto on the contrary, its
In, the 5th diode D of clamp circuit5Cathode and the first IGBT (T1) collector be connected, the 6th diode D6Anode with
2nd IGBT (T2) emitter be connected, the 7th diode D7Cathode and the 3rd IGBT (T3) collector be connected, the eight or two pole
Pipe D8Anode and the 4th IGBT (T4) emitter be connected.
When submodule input current is positive, electric current passes through the D in clamp circuit6And D7, clamp circuit is equivalent to one and leads
Line, by HBSM1And HBSM2Series connection, when submodule input current is negative, electric current passes through the D in clamp circuit8And D5, clamp circuit
It is equivalent to a conducting wire, by HBSM1And HBSM2Series connection, therefore under normal mode of operation, the control method of HBSM can be used for
The control of the clamper Shuangzi module proposed, there are three types of submodule output voltages: 0, UcAnd 2Uc, wherein UcFor capacitance voltage.When
Module works in non-blocking mode, and current direction is timing, and what such situation was mainly used for module does not control precharge, submodule output
Voltage is 2Uc；When current direction is negative, for DC side, there is a situation where short troubles for this, and current path is D at this time3—C2—
D8—D5—C1—D2, two capacitors series connection in submodule, submodule output voltage is -2Uc, at this point, fault current back through
Diode is to two capacitor chargings, and the discharge current of capacitor is contrary with its charging current, so can quickly block event
Hinder electric current.
The solution have the advantages that:
(1) clamper Shuangzi module proposed by the present invention is connect with two half-bridge submodules by a clamp circuit and is formed,
Clamp circuit is made of four diodes, controllable devices is free of in clamp circuit, therefore clamp circuit does not need additionally to control, drop
The complexity of low submodule control, and its cost and loss are lower than traditional clamper Shuangzi module.
(2) when working normally, clamper Shuangzi module proposed by the present invention can be equivalent to the series connection of two half-bridge submodules, because
The control strategy of half-bridge module can be transplanted in the control of proposed clamper Shuangzi module by this, and control algolithm is simple.
(3) when clamper Shuangzi module proposed by the present invention works normally, operating mode and traditional clamper Shuangzi module phase
Together, 3 level can be generated.
(4) the DC Line Fault Scavenging activity of clamper Shuangzi module proposed by the present invention is 2 times of traditional clamper Shuangzi module,
With stronger DC Line Fault self-cleaning ability, it is of great significance for the security reliability of system.
(5) clamper Shuangzi module versatility proposed by the present invention is good, two half bridge sections in submodule can be replaced
It is like flying across capacitive submodule, neutral point clamper type submodule etc. for other submodules without DC Line Fault Scavenging activity,
Make it under the action of clamp circuit, there is DC Line Fault self-cleaning ability.
Detailed description of the invention
The structure and its current path under DC Line Fault that Fig. 1 is traditional CDSM
Fig. 2 is CDSM topology diagram proposed by the present invention and its current path under DC Line Fault
Fig. 3 is DC side electric current when direct-current short circuit failure occurs
Fig. 4 is DC voltage when direct-current short circuit failure occurs
Table 1 is CDSM operating mode proposed by the present invention
Table 2 is the operating mode of traditional CDSM
Specific embodiment
The present invention will be further described in detail with subordinate list with reference to the accompanying drawing.
(1) sub- module topology structure is illustrated first:
As shown in Figure 1, traditional clamper Shuangzi module connects what two half-bridge modules formed by a clamp circuit,
Middle clamp circuit is made of two diodes and guidance IGBT one diode of inverse parallel, guidance IGBT submodule just
It is in the conductive state under normal operating mode.When the electric current for flowing into submodule is timing, which is equivalent in normal work
Two half-bridge submodule tandem workings；When the electric current for flowing into submodule is negative, two capacitors in working condition and submodule
The size of voltage is related；When DC side breaks down, all IGBT are latched, submodule current path and current direction such as Fig. 1
Shown in middle heavy line.From fig. 1, it can be seen that when dc-side short-circuit fault, two capacitor parallel connections in submodule, the voltage phase of submodule
When in the voltage of a capacitor, therefore its ability for removing DC Line Fault is identical as the full-bridge submodule of only one capacitor, this
It is also a disadvantage of the topology.
As shown in Fig. 2, clamper Shuangzi module proposed by the present invention is to connect two half-bridge module groups by a clamp circuit
At wherein clamp circuit is made of four diodes, controllable devices is not present in clamp circuit, therefore do not need to carry out it
Additional control.Clamp circuit due to connecting two half-bridge modules in the present invention is symmetrical, entire clamper Shuangzi module
It is also bilateral symmetry, therefore, no matter submodule input current is positive or is negative, and normal mode of operation can be equivalent to two
Half-bridge module tandem working.When DC side breaks down, current path and direction are as shown in heavy line in Fig. 2.It can from Fig. 2
To find out, when DC side breaks down, two capacitor series connection, the output of submodule in clamper Shuangzi module proposed by the present invention
Voltage is the sum of two capacitance voltages, therefore its ability for removing DC Line Fault is 2 times of traditional clamper Shuangzi module.
(2) operating mode of surface analysis clamper Shuangzi module proposed by the present invention under:
By the symmetry of the submodule topological structure proposed, normal mode of operation only analyzes what submodule electric current was positive
Situation:
①T1=T4=1, T2=T3When=0, the output voltage U of submodulesm=2Uc；
②T1=T3=1, T2=T4When=0, the output voltage U of submodulesm=Uc；
③T2=T4=1, T1=T3When=0, the output voltage U of submodulesm=Uc；
④T2=T3=1, T1=T4When=0, the output voltage U of submodulesm=0.
Under non-blocking mode, according to submodule sense of current, there are two types of situations:
1. group blocks current ismWhen > 0, submodule output voltage Usm=2Uc；
2. group blocks current ismWhen < 0, submodule output voltage Usm=-2Uc。
Table 1
Table 2
As shown in Table 1 and Table 2, clamper Shuangzi module proposed by the present invention and traditional clamper Shuangzi module is set forth
Operating mode.As can be seen from Table 1 and Table 2, the normal mode of operation of clamper Shuangzi module proposed by the present invention and traditional clamper
Shuangzi module be it is identical, all can produce 3 kinds of level.Under non-blocking mode, when the electric current for flowing into submodule is timing, the present invention is mentioned
The working condition of clamper Shuangzi module out is identical with traditional clamper Shuangzi module, and such mode operates mainly in submodule
Do not control pre-charging stage.When the electric current for flowing into submodule is negative, such mode is mainly used to isolated DC side failure, at this time
Two capacitors of clamper Shuangzi module proposed by the present invention are concatenated, and two capacitors of traditional clamper Shuangzi module are in parallel
, therefore the backward voltage that can generate of clamper Shuangzi module proposed by the present invention is 2 times of traditional clamper Shuangzi module, is had
Stronger DC Line Fault self-cleaning ability.
(3) below by taking ab phase circuit as an example, it is double to analyze clamper proposed by the present invention for two clamper Shuangzi modules of each bridge arm
Submodule DC Line Fault self-cleaning ability:
Make have electric current in ab phase circuit, then the phase voltage U of ab phaseabIt should be greater than DC voltage Udc, i.e.,
Uab> Udc≈2×2NUc (1)
And when MMC is worked normally, modulation degree is less than or equal to 1, therefore DC voltage UdcPhase voltage peak value greater than 2 times
Um, i.e.,
In formula, N is the number of each bridge arm Neutron module, UabmFor ab phases line voltage peak value.
According to formula (1) and formula (2) it is found that there is no current loop between exchange side and inverter, therefore DC Line Fault occurs
Afterwards, the electric current for exchanging side may not flow into DC side.In fact, short trouble occurs in DC side, and after all IGBT lockings, bridge
Electric current in arm is mainly the discharge current of inductance, and by diode to submodule capacitor charging, and submodule capacitor is put
Electric current and inductance are exactly the opposite by the direction of diode to submodule capacitance charging current, therefore can make the electricity in bridge arm
Stream decays to zero rapidly, to realize without disconnecting exchange side or DC side breaker, and is removed by inverter itself straight
Flow the purpose of fault current.
As shown in Figure 3 and Figure 4, when dc-side short-circuit fault respectively occurs, the response diagram of DC side electric current and voltage.2s
At the moment, the bipolar short trouble of DC side occurs for MMC, after 10ms, all IGBT lockings.From figure 3, it can be seen that the wink broken down
Between, DC current moment increases, and after all IGBT lockings, DC current and voltage are all reduced to zero, eliminate DC Line Fault
Electric current demonstrates the DC Line Fault self-cleaning ability of proposed clamper Shuangzi module.
Clamper Shuangzi module proposed by the present invention with DC Line Fault Scavenging activity, compared to traditional clamper Shuangzi mould
Block reduces costs, and has stronger DC Line Fault Scavenging activity.In normal operating conditions, clamper proposed by the present invention
Shuangzi module is equivalent to the series connection of two half-bridge submodules, therefore the control method of half-bridge submodule can be transplanted to the present invention
In the control of the clamper Shuangzi module of proposition, control algolithm is simple.In addition, the clamp circuit in the topological structure proposed has
It can also be connect by versatility with same method with the submodule for the ability for not having DC Line Fault removing, like flying across electricity
Hold (FC) type submodule, neutral point clamper (NPC) type submodule etc..
Claims (2)
1. a kind of clamper Shuangzi module with DC Line Fault self-cleaning ability, it is characterised in that: including a clamp circuit with
Two half-bridge submodules, first half-bridge submodule HBSM1Input terminal of the input terminal as clamper Shuangzi module, first half
The capacitor C of bridge submodule1With the A of clamp circuit, the end B is in parallel, the E of clamp circuit, the end F and second half-bridge submodule HBSM2's
Capacitor C2Parallel connection, output end of the input terminal of second half son's bridge module as clamper Shuangzi module.
2. a kind of clamper Shuangzi module with DC Line Fault self-cleaning ability, it is characterised in that: clamp circuit is by four two poles
The 5th diode D of pipe5, the 6th diode D6, the 7th diode D7With the 8th diode D8Composition, is a four-pole network, and left
Right symmetrical, each diode two diodes connection direction adjacent thereto is on the contrary, wherein, the 5th diode D of clamp circuit5's
Cathode and the first IGBT (T1) collector be connected, the 6th diode D6Anode and the 2nd IGBT (T2) emitter be connected, the
Seven diode D7Cathode and the 3rd IGBT (T3) collector be connected, the 8th diode D8Anode and the 4th IGBT (T4)
Emitter is connected.
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| CN201910174612.5A CN109861512A (en) | 2019-03-08 | 2019-03-08 | A kind of clamper Shuangzi module with DC Line Fault self-cleaning ability |
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| CN201910174612.5A CN109861512A (en) | 2019-03-08 | 2019-03-08 | A kind of clamper Shuangzi module with DC Line Fault self-cleaning ability |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110994974A (en) * | 2019-11-25 | 2020-04-10 | 上海交通大学 | Low-loss modular multi-level direct current-direct current converter and submodule thereof |
| CN112803758A (en) * | 2021-01-15 | 2021-05-14 | 西安交通大学 | Non-isolated high-voltage direct current-direct current converter with fault blocking function and method |
| CN114123812A (en) * | 2021-10-29 | 2022-03-01 | 西安交通大学 | MMC clamping dual-sub module based on reverse conducting IGBT |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110994974A (en) * | 2019-11-25 | 2020-04-10 | 上海交通大学 | Low-loss modular multi-level direct current-direct current converter and submodule thereof |
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| CN112803758A (en) * | 2021-01-15 | 2021-05-14 | 西安交通大学 | Non-isolated high-voltage direct current-direct current converter with fault blocking function and method |
| CN112803758B (en) * | 2021-01-15 | 2021-12-28 | 西安交通大学 | Non-isolated high-voltage direct current-direct current converter with fault blocking function and method |
| CN114123812A (en) * | 2021-10-29 | 2022-03-01 | 西安交通大学 | MMC clamping dual-sub module based on reverse conducting IGBT |
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Application publication date: 20190607 |