CN103066582B - A kind of modularization multi-level converter method of overvoltage protection and protector thereof - Google Patents
A kind of modularization multi-level converter method of overvoltage protection and protector thereof Download PDFInfo
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- CN103066582B CN103066582B CN201210537285.3A CN201210537285A CN103066582B CN 103066582 B CN103066582 B CN 103066582B CN 201210537285 A CN201210537285 A CN 201210537285A CN 103066582 B CN103066582 B CN 103066582B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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Abstract
The present invention relates to a kind of modularization multi-level converter method of overvoltage protection and protector thereof, method of overvoltage protection comprises the steps: to arrange modularization multi-level converter excess voltage preventer: excess voltage preventer comprises discharge circuit, all presses antihunt circuit and lightning arrester, device be arranged on modularization multi-level converter exchange end with between ground, between DC terminal with ground, exchange between holding, between DC terminal or be arranged at the above-mentioned position being greater than simultaneously; Arrange the operation voltage parameter of lightning arrester, the operation voltage parameter of lightning arrester comprises reference voltage, switching-surge protective level, atmospheric over voltage protection level and steep wave overvoltage protection level; The operation voltage of discharge circuit is set: the operation voltage of discharge circuit is according to the expection invasion power-frequency overvoltage level set of modularization multi-level converter; The time-delay action of discharge circuit is set.Invention increases economy and the reliability of modularization multi-level converter.
Description
Technical field
The present invention relates to converter method of overvoltage protection and device, be specifically related to a kind of modularization multi-level converter method of overvoltage protection and protector thereof.
Background technology
Modularization multi-level converter (Modular Multilevel Converter, MMC) is a kind of novel converter based on turn-off device.The most often at present igbt (IGBT) by the turn-off device used.Modularization multi-level converter (as Fig. 1) comprises submodule 1 and converter reactor 2, respectively exchanges between end (A, B, C) and DC terminal (P, N) be connected in series one or more submodules and converter reactor at it.Main element in submodule comprises IGBT, FWD, resistor R and capacitor C, and typical sub modular structure comprises half-bridge submodule (as Fig. 2) and full-bridge submodule (as Fig. 3).Traditional line voltage commutation converter (Line Commutated Converter, LCC) belongs to current source type converter, and in operation, inverter output voltage amplitude and polarity change.Modularization multi-level converter employs a large amount of energy storage capacitors, by module superimposing technique, inverter output voltage waveform in operation is remained unchanged simultaneously, belongs to voltage source converter.Therefore, the angle stable from Operating Voltage is considered, modularization multi-level converter has obvious advantage.
Existing method of overvoltage protection mainly uses lightning arrester to protect the invasion switching overvoltage of converter, lightning overvoltage and steep wave overvoltage.Lightning arrester also becomes the basic implement device of Hyper-Voltage of Power Systems protection and insulation coordination.Denomination of invention provides so a kind of method of overvoltage protection for " system for overvoltage protection " patent No. ZL 01813089.5.The method arranges lightning arrester between AC phase conductors and ground, the overvoltage ripple of absorption circuit invasion.Be limited to the energy absorption capability of lightning arrester; what need the rated voltage Ur of lightning arrester to arrange when using the method is enough high; lightning arrester generation thermal runaway during to prevent power-frequency overvoltage and occur blast, correspondingly improves the overvoltage protection level of lightning arrester and the insulation level of protected equipment and cost.
The another kind of over-voltage of prior art is use the discharging gap of self recovery to carry out overvoltage protection to the method that protected equipment endangers.Denomination of invention is " a kind of 1000kV UHVAC transmission line live line working portable protective gaps ", and publication number is that CN101335430B provides a kind of typical overvoltage protection gap.Limited overvoltage protection ability is provided to protected object by control gap discharge voltage.Because gap electrical field is generally inhomogeneous field; or even severe non-uniform electric field; its discharge voltage particularly has certain deviation from randomness under switching overvoltage ripple and lightning overvoltage ripple, thus there is certainty and insecurity scarcely to the switching overvoltage of protected object and the protection of lightning overvoltage.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of modularization multi-level converter method of overvoltage protection and protector thereof, improve economy and the reliability of modularization multi-level converter.
The object of the invention is to adopt following technical proposals to realize:
A kind of modularization multi-level converter method of overvoltage protection, its improvements are, described method comprises the steps:
Step 1: modularization multi-level converter excess voltage preventer is set: described excess voltage preventer with individually, two and the above mode that is connected in series or two and above parallel be arranged on modularization multi-level converter exchange end with between ground, between DC terminal with ground, exchange between holding, between DC terminal or be arranged at the above-mentioned position being greater than simultaneously;
Step 2: the operation voltage parameter that lightning arrester is set: the operation voltage parameter of lightning arrester comprises: reference voltage U
ref, switching-surge protective level SIPL, the horizontal LIPL of atmospheric over voltage protection and steep wave overvoltage protection level STIPL;
Step 3: the operation voltage U that discharge circuit is set
g: the operation voltage of discharge circuit is according to the expection invasion power-frequency overvoltage level set of modularization multi-level converter;
Step 4: the time-delay action that discharge circuit is set.
Wherein, in described step 1, described modularization multi-level converter excess voltage preventer comprises discharge circuit, all presses antihunt circuit and lightning arrester; Described discharge circuit one end, all pressure antihunt circuit high-pressure section one end and lightning arrester one end are electrically connected together; The described discharge circuit other end, all pressure antihunt circuit low-pressure section one end and the lightning arrester other end are electrically connected together;
The action when there is power-frequency overvoltage of discharging gap in described discharge loop.
Wherein, described antihunt circuit of all pressing is used for: 1) make the voltage that in discharge circuit, discharging gap and electric discharge trigger element bear distribute by the resistance value of the high-pressure section and low-pressure section of all pressing antihunt circuit; 2) for the trigging control part of the trigger element that discharges in discharge circuit provides measurement input; 3) discharging current when discharging gap or lightning arrestor movement for capacity cell provides damping.
Wherein, described lightning arrester is metal oxide arrester, for reducing switching overvoltage, lightning overvoltage and steep wave overvoltage that modularization multi-level converter suffers; When the reference voltage of lightning arrester is U
reftime, the preferred value of the switching-surge protective level of lightning arrester is the U of 1.5 ~ 1.8p.u
ref, the preferred value of atmospheric over voltage protection level is the U of 1.8 ~ 2.2p.u
ref, the preferred value of steep wave overvoltage protection level is the U of 2.2 ~ 2.5p.u.
ref.
Wherein, in described step 2, according to the continuous operating voltage U of modularization multi-level converter
cor maximum direct current crest voltage PCOV, the operation voltage parameter of lightning arrester is determined with reference to standard GB/T 311.1-1997 " insulation coordination of high-tension power transmission and transformation equipment " and power industry standard DL/T605-1996 " HVDC (High Voltage Direct Current) converter substation insulation coordination directive/guide "; The unit of described lightning arrestor movement voltage parameter, continuous operating voltage and maximum direct current crest voltage is kV.
Wherein, in described step 3, the operation voltage U of discharge circuit
gbe the frequency breakdown voltage of its discharging gap, unit is kV, and its value is the expection invasion power-frequency overvoltage peak-peak of 0.52 ~ 0.58p.u.; The peak-peak of expection invasion power-frequency overvoltage is decided by the normal working voltage of protected equipment, and for the modularization multi-level converter working in 110kV ~ 750kV AC network, its scope is at 90kV ~ 1060kV.
Wherein, in described step 4, the discharging gap in discharge circuit is bearing operation voltage U
gaction after time-delay action again, time-delay action unit is ms, and its value is 100 ~ 250ms.
The present invention is based on a kind of modularization multi-level converter excess voltage preventer that another object provides, its improvements are, described excess voltage preventer comprises discharge circuit, all presses antihunt circuit and lightning arrester; Described discharge circuit one end, all pressure antihunt circuit high-pressure section one end and lightning arrester one end are electrically connected together; The described discharge circuit other end, all pressure antihunt circuit low-pressure section one end and the lightning arrester other end are electrically connected together;
Described excess voltage preventer with individually, two and the above mode that is connected in series or two and above parallel be arranged on modularization multi-level converter exchange end with between ground, between DC terminal with ground, exchange between holding, between DC terminal or be arranged at the above-mentioned position being greater than simultaneously.
Wherein, described discharge circuit is composed in series by discharging gap and electric discharge trigger element; Described electric discharge trigger element is made up of two antiparallel thyristors; Described antihunt circuit of all pressing is composed in series by high-pressure section and low-pressure section, and the described high-pressure section of antihunt circuit and the low-pressure section of all pressing all has three kinds of forms, comprising: resistance and Capacitance parallel connection, resistance and capacitances in series, single resistance.
Wherein, the shape of described discharging gap is rod-rod gap, discharging gap distance d according to the operation voltage of discharging gap according to d=0.1859U
gdetermine, the unit of discharging gap distance d is cm.
Wherein, described discharging gap is bearing operation voltage U
gaction after time-delay action again, time-delay action unit is ms, and its value is 100 ~ 250ms.
Wherein, by discharging gap in discharge circuit with all press the high-pressure section of antihunt circuit to be connected in parallel; To be discharged in discharge circuit trigger element and all press the low-pressure section of antihunt circuit to be connected in parallel; It all presses capacitor C in antihunt circuit
1and C
2value be 300 ~ 8000pF, resistor R
1and R
2value be 50 ~ 600k Ω, resistor parameter and capacitor parameters meet: R
1c
1=R
2c
2.
Wherein, described lightning arrester is metal oxide arrester, for reducing switching overvoltage, lightning overvoltage and steep wave overvoltage that modularization multi-level converter suffers; When the reference voltage of lightning arrester is U
reftime, the preferred value of the switching-surge protective level of lightning arrester is the U of 1.5 ~ 1.8p.u
ref, the preferred value of atmospheric over voltage protection level is the U of 1.8 ~ 2.2p.u
ref, the preferred value of steep wave overvoltage protection level is the U of 2.2 ~ 2.5p.u.
ref.
Compared with the prior art, the beneficial effect that the present invention reaches is:
1. the present invention adopts discharging gap suppression module multilevel converter DC terminal or exchanges the power-frequency overvoltage of end; reduce power-frequency overvoltage withstand requirements and the temporary overvoltage level of protection of lightning arrester; thus the insulation level of modularization multi-level converter is reduced; decrease equipment manufacturing cost, improve economy.
2. the present invention adopts lightning arrester suppression module multilevel converter DC terminal or exchanges the switching overvoltage of end, lightning overvoltage and steep wave overvoltage, the energy absorption capability of the lightning arrester that prior art manufactures is larger, modularization multi-level converter can be provided the superpotential abundant protective capacities of switching overvoltage, lightning overvoltage and steep wave, improve the fail safe of modularization multi-level converter.
3. the present invention adopts and all presses antihunt circuit, and after can be discharging gap or lightning arrestor movement, capacity cell discharging current provides damping, is reduced in transient state concussion voltage magnitude and frequency that modularization multi-level converter exchanges end or DC terminal appearance.
Accompanying drawing explanation
Fig. 1 is modular multilevel converter structure;
Fig. 2 is the inner semi-bridge type sub modular structure of modularization multi-level converter in the embodiment of the present invention;
Fig. 3 is modularization multi-level converter internal full-bridge type sub modular structure in the embodiment of the present invention;
Fig. 4 is a kind of preferred implementation of modularization multi-level converter excess voltage preventer in the embodiment of the present invention;
Fig. 5 is the flow chart of modularization multi-level converter method of overvoltage protection in the embodiment of the present invention;
Fig. 6 is the first execution mode of modularization multi-level converter method of overvoltage protection in the embodiment of the present invention;
Fig. 7 is the second execution mode of modularization multi-level converter method of overvoltage protection in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
In the embodiment of the present invention, a kind of preferred implementation of modularization multi-level converter excess voltage preventer as shown in Figure 4, and excess voltage preventer comprises discharge circuit, all presses antihunt circuit and lightning arrester 7; Its discharge circuit is composed in series by discharging gap 3 and electric discharge trigger element 4; It all presses antihunt circuit to be composed in series by high-pressure section 5 and low-pressure section 6, and high-pressure section is or/and low-pressure section consists of serial or parallel connection capacitor C and/or resistor R; A kind of preferred version as shown in Figure 4, discharging gap 3 and all press the high-pressure section 5 of antihunt circuit to be connected in parallel in its discharge circuit; Discharge in its discharge circuit trigger element 4 and all press the low-pressure section 6 of antihunt circuit to be connected in parallel; High-pressure section 5 comprises resistor R in parallel
1with capacitor C
1; Low-pressure section 6 comprises resistor R in parallel
2with capacitor C
2; Its capacitor C
1and C
2representative value be 300 ~ 8000pF, resistor R
1and R
2representative value be 50 ~ 600k, resistance parameter and capacitance parameter meet: R
1c
1=R
2c
2.
All pressure antihunt circuit high-pressure section 5 one end N51, discharge circuit one end N31 and lightning arrester 7 one end N71 are electrically connected together respectively, and it all presses antihunt circuit low-pressure section 6 one end N62, discharge circuit one end N42 and lightning arrester 7 one end N72 to be electrically connected together respectively; The position of described excess voltage preventer with individually, two and the above mode that is connected in series or two and above parallel be arranged on modularization multi-level converter exchange end with between ground, between DC terminal with ground, exchange between holding, between DC terminal or be arranged at the above-mentioned position being greater than simultaneously.
The power-frequency overvoltage that in discharge circuit, discharging gap suffers for reducing modularization multi-level converter.Wherein, the shape of discharging gap is rod-rod gap, and discharging gap distance d can according to the operation voltage of discharging gap according to d=0.1859U
gdetermine, the unit of clearance distance d is cm.
To described modularization multi-level converter excess voltage preventer, in its discharge circuit, discharging gap 3 should action immediately after bearing operation voltage, when should adopt the strategy of deferred action to ensure discharging gap action, described protective device suppresses object for power-frequency overvoltage, avoids malfunction under switching overvoltage, lightning overvoltage and steep wave overvoltage; The time-delay action representative value of its discharge circuit is 100 ~ 250ms.
To described modularization multi-level converter excess voltage preventer, it all presses antihunt circuit effect to be that the voltage that in discharge circuit, discharging gap 3 and electric discharge trigger element 4 bear is distributed by the resistance value of the high-pressure section 5 and low-pressure section 6 of all pressing antihunt circuit; It all presses another effect of antihunt circuit to be for the trigging control part of the trigger element 4 that discharges in discharge circuit provides measurement input; The 3rd of antihunt circuit the effect is all pressed to be that the transient state being reduced in modularization multi-level converter interchange end or DC terminal appearance shakes voltage magnitude and frequency when discharging gap 3 or lightning arrester 7 action for the discharging current of capacity cell provides damping.
Trigging control part is responsible for the trigging control of anti-parallel thyristor element in discharge circuit.When all pressing the power frequency component voltage of the low-pressure section of antihunt circuit to exceed setup control value (being correlated with all pressing antihunt circuit high-low pressure part impedance ratio), between the end showing protective device, there is power-frequency overvoltage.The linear quadratic control circuit of discharge circuit provides triggering signal to make its conducting to thyristor, and then short circuit when between the end realizing whole device after discharging gap conducting, thus protects the protected object with the parallel connection of this device when there is power-frequency overvoltage; When the above-mentioned power frequency component voltage measured is lower than controlling value, linear quadratic control circuit stops the transmitting of triggering signal, and then recovers the electric discharge shutoff of trigger element and the normal insulation of discharging gap.
To described modularization multi-level converter excess voltage preventer, its lightning arrester is metal oxide arrester MOA, for reducing switching overvoltage, lightning overvoltage and steep wave overvoltage that modularization multi-level converter suffers; When the reference voltage of lightning arrester is U
reftime, the preferred value of its switching-surge protective level is the U of 1.5 ~ 1.8p.u
ref, the preferred value of atmospheric over voltage protection level is the U of 1.8 ~ 2.2p.u.
ref, the preferred value of steep wave overvoltage protection level is the U of 2.2 ~ 2.5p.u.
ref.
To described modularization multi-level converter excess voltage preventer, it detects the two ends overvoltage of discharging gap 3 in discharge circuit by Zenith tracking loop, and after meeting discharging gap 3 time-delay action triggered gap.
Modularization multi-level converter method of overvoltage protection flow process provided by the invention as shown in Figure 5, comprises the steps:
Step 1: modularization multi-level converter excess voltage preventer is set, excess voltage preventer with individually, two and the above mode that is connected in series or two and above parallel be arranged on modularization multi-level converter exchange end with between ground, between DC terminal with ground, exchange between holding, between DC terminal or be arranged at the above-mentioned position being greater than simultaneously.
In step 1, a kind of preferred version of its modularization multi-level converter excess voltage preventer as shown in Figure 4, discharging gap and all press the high-pressure section of antihunt circuit to be connected in parallel in its discharge circuit; Discharge in its discharge circuit trigger element and all press the low-pressure section of antihunt circuit to be connected in parallel.Electric discharge trigger element comprises antiparallel thyristor and corresponding trigger control circuit.
Step 2: the operation voltage parameter arranging lightning arrester, the operation voltage parameter of lightning arrester comprises: reference voltage U
ref, switching-surge protective level SIPL, the horizontal LIPL of atmospheric over voltage protection and steep wave overvoltage protection level STIPL, according to the continuous operating voltage U of modularization multi-level converter
cor maximum direct current crest voltage PCOV, the operation voltage parameter of lightning arrester is determined with reference to standard GB/T 311.1-1997 " insulation coordination of high-tension power transmission and transformation equipment " and power industry standard DL/T 605-1996 " HVDC (High Voltage Direct Current) converter substation insulation coordination directive/guide ".Wherein, the unit of each lightning arrestor movement voltage parameter, continuous operating voltage and maximum direct current crest voltage is kV.
Step 3: the operation voltage U that discharge circuit is set
g, the operation voltage of discharge circuit should according to the expection invasion power-frequency overvoltage level set of modularization multi-level converter, and its unit is kV.
In step 3, the operation voltage of discharge circuit is the frequency breakdown voltage of its discharging gap, and its representative value is the expection invasion power-frequency overvoltage peak-peak of 0.52 ~ 0.58p.u..
Step 4: the time-delay action arranging discharge circuit, the time-delay action of discharge circuit is the key of discharge circuit correct operation, and unit is ms, and its representative value is 100 ~ 250ms.
In step 4; in discharge circuit, discharging gap should action immediately after bearing operation voltage; when should adopt the strategy of deferred action to ensure discharging gap action, described protective device suppresses object for power-frequency overvoltage, avoids malfunction under switching overvoltage, lightning overvoltage and steep wave overvoltage.
In step 4, detected the two ends overvoltage of discharging gap in discharge circuit by a Zenith tracking loop, simultaneously triggered gap after meeting discharging gap time-delay action.
Embodiment 1
In the embodiment of the present invention, the first execution mode of modularization multi-level converter method of overvoltage protection is as shown in Figure 6:
In embodiment 1, as shown in Figure 1, inverter inside submodule adopts the semi-bridge type sub modular structure shown in Fig. 2 to the structure of modularization multi-level converter.This modularization multi-level converter is for exchanging 110kV electrical network, and the arrangement of protector provided by the invention as shown in Figure 6.Modularization multi-level converter interchange phase A over the ground, exchange phase B over the ground with exchange phase C excess voltage preventer of the present invention be set over the ground, exchange for suppressing the relatively overvoltage imported into mutually; Meanwhile, modularization multi-level converter DC terminal P over the ground and DC terminal N over the ground between excess voltage preventer of the present invention is set, the end overvoltage to earth imported into for suppressing DC terminal.
In embodiment 1, converter exchange phase A, exchange phase B with exchange phase C voltage to earth nominally valid value be 64kV, converter DC terminal P and DC terminal N over the ground direct voltage nominal peak is 90kV.Be connected to the continuous operating voltage U of lightning arrester in the protective device exchanged between phase and ground
cpeak value is 90kV, and being connected to the maximum direct current crest voltage PCOV of lightning arrester in the protective device between DC terminal and ground is 90kV.With reference to standard GB/T 311.1-1997 " insulation coordination of high-tension power transmission and transformation equipment " and power industry standard DL/T 605-1996 " HVDC (High Voltage Direct Current) converter substation insulation coordination directive/guide "; to determine to exchange between phase and ground in protective device each lightning arrester and between DC terminal and ground in protective device the switching-surge protective level SIPL of each lightning arrester be 232kV; the horizontal LIPL of atmospheric over voltage protection is 290kV, and steep wave overvoltage protection level STIPL is 319kV.
In embodiment 1, according to calculate invasion modularization multi-level converter expection power-frequency overvoltage peak-peak be 217kV.According to the operation voltage U of discharging gap in the expection invasion power-frequency overvoltage peak-peak determination discharge circuit of 0.56p.u.
gfor 126kV.
In embodiment 1, the time-delay action arranging discharging gap in discharge circuit is 200ms.
In embodiment 1, modules multilevel converter excess voltage preventer all comprises discharge circuit, all presses antihunt circuit and lightning arrester.The N51 end of the N31 end of discharge circuit, all pressure antihunt circuit high-pressure section and the N71 end of lightning arrester link together, and this link are connected to interchange end A, B and C and the DC terminal P and N of modularization multi-level converter.The N62 end of the N42 end of discharge circuit, all pressure antihunt circuit low-pressure section and the N72 end of lightning arrester link together, and this link are connected to the earth.
In embodiment 1, the discharge circuit of modularization multi-level converter excess voltage preventer is made up of discharging gap and electric discharge triggering Thyristors in series; Antihunt circuit is all pressed to be composed in series by high-pressure section and low-pressure section.Wherein, all press the high-pressure section of antihunt circuit by resistance and Capacitance parallel connection, its resistance value is 500k Ω, and capacitance is 40pF; Low-pressure section is by resistance and Capacitance parallel connection, and its resistance value is 50k Ω, and capacitance is 400pF.
In embodiment 1, in discharge circuit, the shape of discharging gap is rod-rod gap, and discharging gap distance d determines according to the following formula according to the operation voltage of discharging gap:
d＝0.1859U
g＝23.4cm ①。
Embodiment 2
In the embodiment of the present invention, the second execution mode of modularization multi-level converter method of overvoltage protection is as shown in Figure 7:
In example 2, as shown in Figure 1, inverter inside submodule adopts the bridge-type sub modular structure shown in Fig. 3 to the structure of modularization multi-level converter.This modularization multi-level converter is for exchanging 220kV electrical network, the arrangement of protector provided by the invention as shown in Figure 7, as different from Example 1: modularization multi-level converter interchange phase A with exchange between phase B, exchange phase B and exchange between phase C, exchange phase C with exchanging between phase A excess voltage preventer of the present invention is set, exchange for suppressing the alternate overvoltage imported into mutually; Simultaneously, between the DC terminal P and DC terminal N of modularization multi-level converter, two excess voltage preventers provided by the invention are set to be connected in series mode, to reduce occupation of land and the insulation coordination requirement of single assembly, overvoltage between the end imported into for suppressing DC terminal.
In example 2, each modularization multi-level converter excess voltage preventer all comprises discharge circuit, all presses antihunt circuit and lightning arrester.The N51 end of the N31 end of discharge circuit, all pressure antihunt circuit high-pressure section and the N71 end of lightning arrester link together; The N62 end of the N42 end of discharge circuit, all pressure antihunt circuit low-pressure section and the N72 end of lightning arrester link together.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.
Claims (2)
1. a modularization multi-level converter method of overvoltage protection, is characterized in that, described method comprises the steps:
Step 1: modularization multi-level converter excess voltage preventer is set: described excess voltage preventer with individually, two and the above mode that is connected in series or two and above parallel be arranged on modularization multi-level converter exchange end with between ground, between DC terminal with ground, exchange between holding, between DC terminal or be arranged at the above-mentioned position being greater than simultaneously;
Step 2: the operation voltage parameter that lightning arrester is set: the operation voltage parameter of lightning arrester comprises: reference voltage U
ref, switching-surge protective level SIPL, the horizontal LIPL of atmospheric over voltage protection and steep wave overvoltage protection level STIPL;
Step 3: the operation voltage U that discharge circuit is set
g: the operation voltage of discharge circuit is according to the expection invasion power-frequency overvoltage level set of modularization multi-level converter;
Step 4: the time-delay action that discharge circuit is set;
In described step 1, described modularization multi-level converter excess voltage preventer comprises discharge circuit, all presses antihunt circuit and lightning arrester; Described discharge circuit one end, all pressure antihunt circuit high-pressure section one end and lightning arrester one end are electrically connected together; The described discharge circuit other end, all pressure antihunt circuit low-pressure section one end and the lightning arrester other end are electrically connected together; All press antihunt circuit high-pressure section and all press antihunt circuit low-pressure section to be connected in series;
The action when there is power-frequency overvoltage of discharging gap in described discharge circuit;
Described antihunt circuit of all pressing is used for: 1) make the voltage that in discharge circuit, discharging gap and electric discharge trigger element bear distribute by the resistance value of the high-pressure section and low-pressure section of all pressing antihunt circuit; 2) for the trigging control part of the trigger element that discharges in discharge circuit provides measurement input; 3) when discharging gap or lightning arrestor movement for modularization multi-level converter in the capacity cell discharging current of half-bridge submodule or full-bridge submodule damping is provided;
Described lightning arrester is metal oxide arrester, for reducing switching overvoltage, lightning overvoltage and steep wave overvoltage that modularization multi-level converter suffers; When the reference voltage of lightning arrester is U
reftime, the value of the switching-surge protective level of lightning arrester is the U of 1.5 ~ 1.8p.u.
ref, the value of atmospheric over voltage protection level is the U of 1.8 ~ 2.2p.u.
ref, the value of steep wave overvoltage protection level is the U of 2.2 ~ 2.5p.u.
ref;
In described step 2, according to the continuous operating voltage U of modularization multi-level converter
cor maximum direct current crest voltage PCOV, the operation voltage parameter of lightning arrester is determined with reference to standard GB/T 311.1-1997 " insulation coordination of high-tension power transmission and transformation equipment " and power industry standard DL/T 605-1996 " HVDC (High Voltage Direct Current) converter substation insulation coordination directive/guide "; The unit of described lightning arrestor movement voltage parameter, continuous operating voltage and maximum direct current crest voltage is kV;
In described step 3, the operation voltage U of discharge circuit
gbe the frequency breakdown voltage of its discharging gap, unit is kV, and its value is the expection invasion power-frequency overvoltage peak-peak of 0.52 ~ 0.58p.u.;
In described step 4, the discharging gap in discharge circuit is bearing operation voltage U
gaction after time-delay action again, time-delay action unit is ms, and its value is 100 ~ 250ms.
2. a modularization multi-level converter excess voltage preventer, is characterized in that, described excess voltage preventer comprises discharge circuit, all presses antihunt circuit and lightning arrester; Described discharge circuit one end, all pressure antihunt circuit high-pressure section one end and lightning arrester one end are electrically connected together; The described discharge circuit other end, all pressure antihunt circuit low-pressure section one end and the lightning arrester other end are electrically connected together;
Described excess voltage preventer with individually, be connected in series mode or parallel be arranged on modularization multi-level converter exchange end with between ground, between DC terminal with ground, exchange between holding, between DC terminal or be arranged at the above-mentioned position being greater than simultaneously;
Described discharge circuit is composed in series by discharging gap and electric discharge trigger element; Described electric discharge trigger element is made up of two antiparallel thyristors; Described antihunt circuit of all pressing is composed in series by high-pressure section and low-pressure section, and the described high-pressure section of antihunt circuit and the low-pressure section of all pressing all has three kinds of forms, comprising: resistance and Capacitance parallel connection, resistance and capacitances in series, single resistance;
The shape of described discharging gap is rod-rod gap, discharging gap distance d according to the operation voltage of discharging gap according to d=0.1859U
gdetermine, the unit of discharging gap distance d is cm;
Described discharging gap is bearing operation voltage U
gand action after time-delay action, time-delay action unit is ms, and its value is 100 ~ 250ms;
By discharging gap in discharge circuit with all press the high-pressure section of antihunt circuit to be connected in parallel; To be discharged in discharge circuit trigger element and all press the low-pressure section of antihunt circuit to be connected in parallel; It all presses capacitor C in antihunt circuit
1and C
2value be 300 ~ 8000pF, resistor R
1and R
2value be 50 ~ 600k Ω, resistor parameter and capacitor parameters meet: R
1c
1=R
2c
2;
Described lightning arrester is metal oxide arrester, for reducing switching overvoltage, lightning overvoltage and steep wave overvoltage that modularization multi-level converter suffers; When the reference voltage of lightning arrester is U
reftime, the value of the switching-surge protective level of lightning arrester is the U of 1.5 ~ 1.8p.u.
ref, the value of atmospheric over voltage protection level is the U of 1.8 ~ 2.2p.u.
ref, the value of steep wave overvoltage protection level is the U of 2.2 ~ 2.5p.u.
ref.
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| WO2019020195A1 (en) * | 2017-07-28 | 2019-01-31 | Siemens Aktiengesellschaft | Impedor for ac fault current handling in an hvdc transmission converter |
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| CN104467393A (en) * | 2015-01-04 | 2015-03-25 | 南京南瑞继保电气有限公司 | Device for preventing sub-module capacitor overvoltage |
| EP3639360B1 (en) | 2017-07-27 | 2021-11-17 | Siemens Energy Global GmbH & Co. KG | Converter arrangement having phase module arrester and method for short-circuit protection thereof |
| CN108879637B (en) * | 2018-08-03 | 2020-01-10 | 南京南瑞继保电气有限公司 | Parameter design method for lightning arrester at connecting bus of hybrid direct-current high-low voltage converter |
| CN110932225B (en) * | 2019-10-29 | 2022-09-02 | 中国电力科学研究院有限公司 | Setting method and setting device for overvoltage protection of ultra/extra-high voltage alternating current circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1584607A (en) * | 2004-05-31 | 2005-02-23 | 席世友 | Overvoltage on-line sampler for 6-35 KV electric power system |
| CN101178429A (en) * | 2007-11-06 | 2008-05-14 | 中国电力科学研究院 | Electric potential displace method based on gate circuit transistor gate control |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05122844A (en) * | 1991-10-25 | 1993-05-18 | Ngk Insulators Ltd | Semiconductor arrester |
-
2012
- 2012-12-12 CN CN201210537285.3A patent/CN103066582B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1584607A (en) * | 2004-05-31 | 2005-02-23 | 席世友 | Overvoltage on-line sampler for 6-35 KV electric power system |
| CN101178429A (en) * | 2007-11-06 | 2008-05-14 | 中国电力科学研究院 | Electric potential displace method based on gate circuit transistor gate control |
Non-Patent Citations (2)
| Title |
|---|
| ±1100kV特高压直流换流站过电压保护和绝缘配合;周浩等;《电网技术》;20120930;第36卷(第9期);第1-8页 * |
| 锦屏-苏南特高压直流输电工程换流站绝缘配合;聂定珍等;《高电压技术》;20100131;第36卷(第1期);第92-97页 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019020195A1 (en) * | 2017-07-28 | 2019-01-31 | Siemens Aktiengesellschaft | Impedor for ac fault current handling in an hvdc transmission converter |
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