CN104635151B - A kind of cascade full-bridge direct current breaker low pressure equivalent test circuit and its detection method - Google Patents
A kind of cascade full-bridge direct current breaker low pressure equivalent test circuit and its detection method Download PDFInfo
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Abstract
The invention discloses a kind of cascade full-bridge direct current breaker low pressure equivalent test circuit and its detection methods,Equivalent test circuit proposed by the present invention and its detection method are according to electric current transfer and turn off process time equivalence principle,Pass through equivalent impedance,The action process for cascading full-bridge high voltage DC breaker is simulated using low-voltage device and circuit,It may be implemented to the equivalent of cascade full-bridge high voltage DC breaker commutation time twice,To accurately verify the requirement to control protection equipment sequential,By simplifying equivalent condition,In voltage ratio,Electric current ratio,Impedance ratio meets under conditions of proportionate relationship,Transfer submodule number can differ,Also the equivalent of commutation time twice can be realized,Equivalent experiment circuit proposed by the present invention utilizes lower cost,Realize the verification that equipment is protected to cascade full-bridge high voltage DC breaker operation principle and linear quadratic control,It can be good at showing the course of work of high voltage DC breaker.
Description
Technical field
The present invention relates to a kind of power electronic devices, and in particular to a kind of cascade full-bridge direct current breaker low pressure equivalent test
Circuit and its detection method.
Background technology
With the development of high-voltage great-current semiconductor devices and power electronic technique, high voltage dc transmission technology is flexible straight
Technology of transmission of electricity is flowed, DC grid technology etc. has obtained more and more concerns and application.Since flexible DC power transmission circuit is being sent out
When life DC side is bipolar short-circuit, DC current rapid increase, current-rising-rate is up to 3kA/ms, and cannot pass through flexible direct current
Converter valve itself effectively prevents the rising of short circuit current that from leading to the damage of converter valve equipment if do not adopted an effective measure.Needle
The high voltage DC breaker of flexible DC power transmission equipment can be changed in disengagement failure electric current, isolated fault, protection in a short time
Flow valve.
Since the electric current rate of climb is fast when flexible DC power transmission circuit occurs bipolar short-circuit, it is desirable that high voltage DC breaker energy
Enough quick actings.Therefore, the break of fault current is dc circuit breaker important indicator.
The dc circuit breaker of mechanical switch and power electronic devices hybrid mode, normal operation is through-flow by mechanical switch, therefore
The electric current of main branch is transferred to when barrier in the power electronic devices branch being connected in parallel, then by power electronic devices disjunction electricity
Stream.When the breaker normal operation of the type, on-state loss is small, and break is disconnected.The grade that CN103280763A patents disclose
Connection full-bridge direct current breaker is an example of the type dc circuit breaker, circuit topology such as Fig. 1, shown in 2.Fig. 1 is existing
Technology cascade full-bridge direct current breaker circuit topological diagram；Fig. 2 is the internal circuit diagram of the submodule (SM) in Fig. 1；Cascade is complete
Bridge dc circuit breaker uses concatenated IGBT full-bridges submodule disjunction fault current, and it is uneven to avoid device voltage in breaking course
The problem of.Terminal voltage is zero to IGBT when off, reduces switching loss.
It cascades in full-bridge direct current breaker breaking course, needs, according to control flow and sequential, to coordinate control main branch
Module shifts branch submodule, quick isolation switch, and for the failure that different phase occurs, executes different troubleshootings
Program.And all detection, processing, action need to complete in 2~3ms, cascade full-bridge direct current breaker is to control system
Control sequential requires very stringent.Therefore, before carrying out high-potting, it is necessary under the conditions of low-voltage low current, when
Between on equivalent replacement is carried out to high voltage DC breaker, breaker operation principle and linear quadratic control protection equipment are verified.
It is, therefore, desirable to provide a kind of cascade full-bridge direct current breaker low pressure equivalent method come realize to practical breaker into
It is realized to cascade full-bridge direct current breaker principle sequential, control method under low-voltage, low current before horizontal high voltage cranking test
It is detected with troubleshooting measure.
Invention content
In view of the deficiencies of the prior art, the present invention provides a kind of cascade full-bridge direct current breaker low pressure equivalent test circuit,
The equivalent test circuit is by sequentially connected DC power supply Vdc, equivalent reactance device Llv_3, solid-state relay, inductance Llv_1, grade
Join the equivalent submodule SM of full-bridge direct current breaker main branch low pressurelv, load fling-cut switch S1, load resistance RLWith current-limiting resistance RX
Form major loop, the solid-state relay, the inductance Llv_With the equivalent son of the cascade full-bridge direct current breaker main branch low pressure
Module SMlvMain branch is constituted, be connected in parallel on the main branch both ends has transfer branch and energy consumption branch, the transfer branch respectively
By the diode D being connected in series withlv, inductance Llv_2It is constituted with the equivalent submodule of transfer branch low pressure, the energy consumption branch road connects
There are varistor, the load resistance RLBoth ends be parallel with fault simulation switch S2.
Preferably, the voltage class of the hookup is 100~200V, and current class is 5~10A.
Preferably, the operation voltage of the varistor is higher than the direct voltage source VdcVoltage, residual voltage is no more than
The sum of described equivalent submodule rated voltage of transfer branch low pressure.
A kind of detection method of cascade full-bridge direct current breaker low pressure equivalent test circuit, the detection method includes following
Step：
The equivalent submodule of main branch low pressure in the cascade full-bridge direct current breaker low pressure equivalent test circuit is opened, and
By the equivalent submodule locking of the transfer branch low pressure, the solid-state relay is opened；
The fault simulation switch S1 is disconnected, the load fling-cut switch S2 is closed；
It is powered to the DC power supply, adjustment voltage to 100~200V, loop current ibreaker_lvMajor loop is flowed through, is returned
To the D.C. regulated power supply；
It is closed the fault simulation switch S2；
As the loop current ibreaker_lvIt was more than restriction value Ilim_lvWhen, the equivalent son of the transfer branch low pressure is connected
Module is latched the equivalent submodule of main branch low pressure, makes loop current ibreaker_lvTransfer branch is transferred to by the main branch
Road；
As main branch electric current imain_lvAfter being reduced to 0, solid-state relay is disconnected；
It is delayed after 2ms, is latched the equivalent submodule of the transfer branch low pressure, the equivalent submodule capacitance C of transfer branch low pressurelv
Charging, transfer branch and energy consumption branch voltage are begun to ramp up；
After the branch voltage that consumes energy rises to the operation voltage of varistor, varistor is gradually turned on, with energy consumption branch
Road voltage is further up, and energy consumption branch flows through the electric current i of varistorMOV_lvRise, transfer branch current icomm_lvUnder gradually
Drop to 0；
The energy consumption branch flows through the electric current i of varistorMOV_lvIt begins to decline, most Zhongdao 0, terminates after reaching peak value
Detection；
Preferably, the detection method is equivalent including commutation time twice：
The time equivalence of the first time change of current after breaker detects circuit overcurrent, starts the first time change of current, is latched the master
Branch, opens the transfer branch, and electric current is transferred to the transfer branch, the first time of low pressure equivalent model by the main branch
Commutation time is equal with the commutation time of actual high-voltage dc circuit breaker；
The time equivalence of second of change of current, after transfer branch locking, transfer branch submodule voltage rises, and rises to lightning-arrest
After the operation voltage of device, arrester starts leakage current, second of commutation time and the actual high-voltage direct current of low pressure equivalent model
The commutation time of breaker is equal.
Preferably, the detection method meets following formula when carrying out the time equivalence of the first time change of current：
(L1+L2) C=(L1_lv+L2_lv)Clv (1)
C is practical breaker Neutron module capacitance, L in formula (1)1, L2The parasitic electricity of main branch in respectively practical breaker
Sense and transfer branch parasitic inductance, ClvFor low pressure equivalent model Neutron module capacitance, Llv_1, Llv_2Respectively low pressure equivalent model
Middle main branch parasitic inductance and transfer branch parasitic inductance.
Preferably, the detection method meets following formula when carrying out the time equivalence of second of change of current：
CVMOVIbreak_lv=ClvVMOV_lvIbreak(2)
V in formula (2)MOVFor lightning arrestor movement voltage, IbreakFor breaker maximum segment electric current, C is actual DC breaker
Neutron module capacitance, VMOV_lvFor varistor operation voltage in low pressure equivalent model, Ibreak_lvFor breaker maximum segment electricity
Stream, ClvFor low pressure equivalent model Neutron module capacitance.
With immediate prior art ratio, beneficial effects of the present invention are：
1 high-tension line for replacing cascade full-bridge high voltage DC breaker with low-voltage device and circuit and its being connected, can
At low voltage, it using lower cost, realizes and cascade full-bridge high voltage DC breaker operation principle and linear quadratic control protection is set
Standby verification；
2, to the electric parameter of high voltage DC breaker reduce certain ratio carry out it is equivalent, in high voltage DC breaker
Device proportionally relationship selection with similar electrical characteristic low-voltage device carry out it is equivalent, can be good at showing high straightening
Flow the course of work of breaker；
3, low pressure is equivalent may be implemented instead of method to the equivalent of cascade full-bridge high voltage DC breaker commutation time twice,
To accurately verify the requirement to control protection equipment sequential；
4, by simplifying equivalent condition, in voltage ratio, electric current ratio, under conditions of impedance ratio meets proportionate relationship, transfer is sub
Number of modules can differ, and can also realize the equivalent of commutation time twice.
Description of the drawings
Invention is further described in detail with reference to the accompanying drawings and detailed description.
Fig. 1 is prior art cascade full-bridge direct current breaker circuit topological diagram；
Fig. 2 is the internal circuit diagram of the submodule in Fig. 1；
Fig. 3 is present invention cascade full-bridge direct current breaker low pressure equivalent test circuit diagram；
Fig. 4 is the internal circuit diagram of the equivalent submodule in Fig. 3.
Specific implementation mode
The specific implementation mode of the present invention is described in further detail below in conjunction with the accompanying drawings.
In order to thoroughly understand the embodiment of the present invention, detailed structure will be proposed in following description.Obviously, the present invention is real
The execution for applying example is not limited to the specific details that those skilled in the art is familiar with.Presently preferred embodiments of the present invention is retouched in detail
State it is as follows, however in addition to these detailed description other than, the present invention can also have other embodiment.
It is present invention cascade full-bridge direct current breaker low pressure equivalent test circuit diagram with reference to Fig. 3 and Fig. 4, Fig. 3；Fig. 4 is Fig. 3
In equivalent submodule internal circuit diagram.Dc circuit breaker low pressure equivalent test circuit is divided into main branch, transfer branch in Fig. 3
With energy consumption branch, major loop is by the DC power supply V that is electrically connected successivelydc, equivalent reactance device Llv_3, solid-state relay, inductance
Llv_1, the equivalent submodule SM of main branch low pressurelv, load fling-cut switch S1, load resistance RLWith current-limiting resistance RXComposition, main branch
By the solid-state relay, the inductance Llv_With the equivalent submodule SM of the main branch low pressureLv connectsIt constitutes, shifts branch and consumption
Energy branch circuit parallel connection route the diode D being connected in series in the main branch both ends, the transfer branchlv, inductance Llv_2With transfer branch
The equivalent submodule SM of road low pressurelvIt constitutes, the energy consumption branch routing varistor is constituted, the load resistance RLBoth ends be parallel with
Fault simulation switch S2.
In order to enable equivalent experiment circuit is run in a low pressure environment, the cascade full-bridge direct current breaker low pressure is equivalent
The voltage class of model is in 100~200V or so, and current class is in 5~10A or so.
Cascade the equivalent submodule SM of full-bridge direct current breaker low pressurelvCircuit replaces practical submodule SM using low pressure MOSFET
IGBT in (see Fig. 2) uses low-voltage capacitance ClvInstead of the high-voltage capacitance C in actual device, low resistance R is usedlvInstead of reality
Electrion resistance R in the device of border.It is multiple since the conduction voltage drop of MOSFET is much smaller with respect to IGBT, or even in transfer branch
Conduction voltage drop of the conduction voltage drop of series connection submodule likely to be less than solid-state relay in through-flow branch.In order to allow the equivalent mould of low pressure
The commutation course of type is identical as actual device, as needed the series diode D in shifting branchlv, increase conduction voltage drop so that
The conducting resistance relationship of two branches is identical as actual device in low pressure equivalent model.
In high voltage DC breaker, Fast mechanical switch being capable of the disjunction in 2ms.When using disjunction in low pressure equivalent model
Between shorter solid-state relay replace, obtain identical effect.
DC line in low pressure equivalent model need to DC voltage and short circuit after corresponding current-rising-rate into
Row simulation.DC converter station is replaced using direct voltage source, DC voltage is provided for DC line, electricity is sealed in DC line
Anti- device, fault current climbing when limitation is short-circuit.
Replacement to arrester.In high voltage DC breaker, arrester after consuming line short in reactance for producing
Raw energy.In low pressure equivalent model arrester is replaced with varistor.The varistor operation voltage of selection is higher than direct current
Potential source VdcVoltage, residual voltage should be no more than transfer the sum of branch submodule rated voltage.
Replacement to DC load.In high voltage DC breaker, DC load provides normal operating current.Low pressure is equivalent
In model DC load is replaced with slide rheostat.
Simulation to fault current.When occurring bipolar in actual track, DC current can rise according to certain slope.
It is used in low pressure equivalent model, is the bipolar short circuit of analog line, the sliding variable resistance of DC load will be replaced with direct current air switch
Device bypasses.For experiment safety, DC current amplitude is limited, needs to fix sealing in a current-limiting resistance in the line again.
A kind of detection method of cascade full-bridge direct current breaker low pressure equivalent circuit, the equivalent circuit is above-mentioned equivalent electricity
Road, described detection method includes the following steps：
1) it is open-minded that the equivalent submodule of main branch low pressure in full-bridge direct current breaker low pressure equivalent test circuit will be cascaded, turned
The equivalent submodule locking of branch low pressure is moved, solid-state relay is open-minded, keeps breaker in the conduction state；
2) fault simulation switch S1 is disconnected, load fling-cut switch S2 is closed, makes load resistance RL, current-limiting resistance Rx seals in
In test loop；
3) D.C. regulated power supply powers on, and adjustment voltage is between 100~200V of test voltage, loop current ibreaker_lvStream
Cross equivalent reactance device Llv_3, inductance Llv_1, the equivalent submodule of main branch low pressure, load fling-cut switch S1, load resistance RL, current limliting
Resistance Rx, returns to D.C. regulated power supply；
4) it is closed fault simulation switch S2, by load resistance RLBypass, loop current ibreaker_lvStart rapid rise；
5) as loop current ibreaker_lvIt was more than restriction value Ilim_lvWhen, the conducting transfer equivalent submodule of branch low pressure closes
The equivalent submodule of main branch low pressure is locked, loop current is made to be transferred to transfer branch by main branch；
6) as main branch electric current imain_lvAfter being reduced to 0, solid-state relay is disconnected；
7) it is delayed after 2ms, the locking transfer equivalent submodule of branch low pressure, the equivalent submodule capacitance C of transfer branch low pressurelvIt fills
Electricity, transfer branch and energy consumption branch voltage are begun to ramp up；
8) when energy consumption branch voltage rises to the operation voltage of varistor, varistor is gradually turned on, with energy consumption branch
Road voltage is further up, and energy consumption branch flows through the electric current i of varistorMOV_lvRise, transfer branch current icomm_lvUnder gradually
Drop to 0；
9) energy consumption branch flows through the electric current i of varistorMOV_lvIt is begun to decline after reaching peak value, most Zhongdao 0, experiment knot
Beam；
Wherein, above-mentioned experimental method include twice commutation time it is equivalent：
The time equivalence of the first time change of current.After breaker detects circuit overcurrent, starts the first time change of current, be latched main branch
Road, opens transfer branch, and electric current is transferred to transfer branch by main branch.Low pressure equivalent model needs on changing commutation time and real
Border breaker is close.
To realize the equivalent of the first commutation time, the first time commutation time for making low pressure equivalent model and actual high-voltage are needed
Dc circuit breaker is equal, should meet：
(L1+L2) C=(L1_lv+L2_lv)Clv (1)
C is practical breaker Neutron module capacitance, L in formula (1)1, L2The parasitic electricity of main branch in respectively practical breaker
Sense and transfer branch parasitic inductance, ClvFor low pressure equivalent model Neutron module capacitance, Llv_1, Llv_2Respectively low pressure equivalent model
Middle main branch parasitic inductance and transfer branch parasitic inductance.
The time equivalence of second of change of current.After shifting branch locking, transfer branch submodule voltage rises, and rises to lightning-arrest
After the operation voltage of device, arrester starts leakage current.The process is transfer direct current submodule capacitor charging process, to realize the
Two commutation times it is equivalent, need to make second of commutation time of low pressure equivalent model equal with actual high-voltage dc circuit breaker,
It should meet：
CVMOVIbreak_lv=ClvVMOV_lvIbreak (2)
V in formula (2)MOVFor lightning arrestor movement voltage, IbreakFor breaker maximum segment electric current, C is actual DC breaker
Neutron module capacitance, VMOV_lvFor varistor operation voltage in low pressure equivalent model, Ibreak_lvFor breaker maximum segment electricity
Stream, ClvFor low pressure equivalent model Neutron module capacitance.
The voltage ratio of practical breaker and low pressure equivalent model, current ratio are defined, impedance ratio is respectively：
Then work as satisfaction：
When, formula (1) and (2) also meet, therefore,It is the adequate condition that commutation time is equivalent twice.Therefore, may be used
According toProportionate relationship, to sub- module capacitance, loop inductance, the parameters such as submodule voltage and breaker breaking current
It is selected.
Without transfer branch submodule number in formula (6), therefore, transfer branch submodule number in low pressure equivalent model can be with
It differs, also commutation course can be carried out in time equivalent with actual high-voltage dc circuit breaker.
Equivalent experiment circuit proposed by the present invention utilizes lower cost, realizes to cascade full-bridge high voltage DC breaker work
The verification of principle and linear quadratic control protection equipment, can be good at the course of work for showing high voltage DC breaker, and the present invention carries
The equivalent detection method gone out uses low-voltage device according to electric current transfer and turn off process time equivalence principle by equivalent impedance
The action process for cascading full-bridge high voltage DC breaker is simulated with circuit, may be implemented disconnected to cascade full-bridge high voltage direct current
Road device commutation time twice it is equivalent, to accurately verify the requirement to control protection equipment sequential, pass through the equivalent item of simplification
Part, in voltage ratio, electric current ratio, under conditions of impedance ratio meets proportionate relationship, transfer submodule number can differ, and can also realize
Commutation time is equivalent twice.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Invention is explained in detail with reference to above-described embodiment for pipe, and those of ordinary skill in the art still can be to this hair
Bright specific implementation mode is modified or replaced equivalently, these without departing from spirit and scope of the invention any modification or
Equivalent replacement is being applied within pending claims.
Claims (7)
1. a kind of cascade full-bridge direct current breaker low pressure equivalent test circuit, which is characterized in that the equivalent test circuit by according to
The DC power supply V of secondary connectiondc, equivalent reactance device Llv_3, solid-state relay, inductance Llv_1, cascade the main branch of full-bridge direct current breaker
The equivalent submodule SM of road low pressurelv, load fling-cut switch S1, load resistance RLWith current-limiting resistance RXForm major loop, the solid-state
Relay, the inductance Llv_1 With the equivalent submodule SM of the cascade full-bridge direct current breaker main branch low pressurelvConstitute main branch
Road, be connected in parallel on the main branch both ends has transfer branch and energy consumption branch, the transfer branch to route two be connected in series with respectively
Pole pipe Dlv, inductance Llv_2It is constituted with the equivalent submodule of transfer branch low pressure, the energy consumption branch road is connected with varistor, described
Load resistance RLBoth ends be parallel with fault simulation switch S2.
2. cascade full-bridge direct current breaker low pressure equivalent test circuit according to claim 1, which is characterized in that the examination
The voltage class on electrical verification road is 100~200V, and current class is 5~10A.
3. cascade full-bridge direct current breaker low pressure equivalent test circuit according to claim 1, which is characterized in that the pressure
The operation voltage of quick resistance is higher than the direct voltage source VdcVoltage, residual voltage is no more than the equivalent son of the transfer branch low pressure
The sum of module rated voltage.
4. a kind of detection method of cascade full-bridge direct current breaker low pressure equivalent test circuit, the equivalent test circuit is right
It is required that the equivalent test circuit described in 1-3 any one, which is characterized in that described detection method includes the following steps：
The equivalent submodule of main branch low pressure in the cascade full-bridge direct current breaker low pressure equivalent test circuit is opened, and by institute
The equivalent submodule locking of transfer branch low pressure is stated, the solid-state relay is opened；
The fault simulation switch S1 is disconnected, the load fling-cut switch S2 is closed；
It is powered to the DC power supply, adjustment voltage to 100~200V, loop current ibreaker_lvMajor loop is flowed through, is returned to described
DC power supply；
It is closed the fault simulation switch S2；
As the loop current ibreaker_lvIt was more than restriction value Ilim_lvWhen, the equivalent submodule of the transfer branch low pressure is connected,
It is latched the equivalent submodule of main branch low pressure, makes loop current ibreaker_lvTransfer branch is transferred to by the main branch；
As main branch electric current imain_lvAfter being reduced to 0, solid-state relay is disconnected；
It is delayed after 2ms, is latched the equivalent submodule of the transfer branch low pressure, the equivalent submodule capacitance C of transfer branch low pressurelvIt fills
Electricity, transfer branch and energy consumption branch voltage are begun to ramp up；
After the branch voltage that consumes energy rises to the operation voltage of varistor, varistor is gradually turned on, with energy consumption branch electricity
Press further up, energy consumption branch flows through the electric current i of varistorMOV_lvRise, transfer branch current icomm_lvIt gradually decreases to
0；
The energy consumption branch flows through the electric current i of varistorMOV_lvIt is begun to decline after reaching peak value, most Zhongdao 0, terminates detection.
5. the detection method of cascade full-bridge direct current breaker low pressure equivalent circuit according to claim 4, which is characterized in that
The detection method is equivalent including commutation time twice：
The time equivalence of the first time change of current after breaker detects circuit overcurrent, starts the first time change of current, is latched the main branch
The transfer branch is opened on road, and electric current is transferred to the transfer branch by the main branch, and the first time of low pressure equivalent model changes
It is equal with the commutation time of actual high-voltage dc circuit breaker to flow the time；
The time equivalence of second of change of current, after transfer branch locking, transfer branch submodule voltage rises, and rises to arrester
After operation voltage, arrester starts leakage current, second of commutation time and the actual high-voltage direct current interruption of low pressure equivalent model
The commutation time of device is equal.
6. the detection method of cascade full-bridge direct current breaker low pressure equivalent circuit according to claim 5, which is characterized in that
The detection method meets following formula when carrying out the time equivalence of the first time change of current：
(L1+L2) C=(L1_lv+L2_lv)Clv (1)
C is practical breaker Neutron module capacitance, L in formula (1)1, L2In respectively practical breaker main branch parasitic inductance and
Shift branch parasitic inductance, ClvFor low pressure equivalent model Neutron module capacitance, L1_lv, L2_lvIt is main respectively in low pressure equivalent model
Branch parasitic inductance and transfer branch parasitic inductance.
7. the detection method of cascade full-bridge direct current breaker low pressure equivalent circuit according to claim 6, which is characterized in that
The detection method meets following formula when carrying out the time equivalence of second of change of current：
CVMOVIbreak_lv=ClvVMOV_lvIbreak (2)
V in formula (2)MOVFor lightning arrestor movement voltage, IbreakFor breaker maximum segment electric current, C is actual DC breaker neutron
Module capacitance value, VMOV_lvFor varistor operation voltage in low pressure equivalent model, Ibreak_lvFor breaker maximum segment electric current,
ClvFor low pressure equivalent model Neutron module capacitance.
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