CN107231085A - One kind is based on the bipolar equipotential MMC HVDC direct-current short circuit fault ride-through methods of dc bus - Google Patents
One kind is based on the bipolar equipotential MMC HVDC direct-current short circuit fault ride-through methods of dc bus Download PDFInfo
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Classifications
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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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- 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
-
- 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
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
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- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The bipolar equipotential MMC HVDC direct-current short circuit fault ride-through methods of dc bus are based on the present invention relates to one kind, belong to flexible direct current power transmission system DC fault method.This method is close to zero dc-side short-circuit fault electric current, realizes that DC bipolar short trouble is passed through in the case where MMC is controllable by controlling MMC direct current side bus bipolar electric position approximately equal.General principle is rapidly switched to failure operation pattern to detect after direct-current short circuit electric current, the locking and conducting of the upper and lower bridge arm of MMC three-phases are selected according to the polarity of line voltage, MMC circuit topologies are equivalent to chain type star topology, the upper and lower bridge arm voltage that control three is conducted props up line voltage, the bipolar current potential approximately equal of dc bus is realized, reaches that dc-side short-circuit fault electric current is close to zero.This method is maintained after MMC submodule capacitor voltages balance, Failure elimination without AC circuit breaker, and during fault traversing, can recover power transmission rapidly.
Description
Technical field
Invention is related to one kind and is based on the bipolar equipotential MMC-HVDC direct-current short circuits fault ride-through method of dc bus, belongs to
Flexible direct current power transmission system DC Line Fault controls guard method.
Background technology
Technology of HVDC based Voltage Source Converter based on MMC, with it is economical flexibly, can be powered to passive network, independent control
The advantage such as active power and reactive power and output quality of power supply height, has been widely used in wind farm grid-connected, asynchronous power network mutual
Join, the field such as long-distance and large-capacity power transmission.Although flexible DC power transmission has above-mentioned numerous advantages, but the flexibility that presently, there are is straight
Flow in power transmission engineering, whether the MMC topologys of two level, three level or semi-bridge type, all can not occur event in DC side circuit
Fault current is quickly blocked by locking transverter during barrier.And due to direct fault current can not natural zero-crossing point, blow-out be stranded
In difficulty, flexible direct current system, the business application of high-capacity direct current breaker it is still immature.
At present, it is exactly to realize DC Line Fault self-cleaning using transverter itself for the main solution of the problem.Closely
What domestic and foreign scholars were proposed over year is all kinds of with DC Line Fault self-cleaning ability MMC submodules, including：Full-bridge submodule topology knot
Structure and clamp Shuangzi module, series connection Shuangzi module, mixed type submodule, strengthen from resistance type submodule, diode-clamped submodule
The semi-bridge types such as block improve topology as shown in Figure 4.These semi-bridge types improve the energy that topological structure had both remained DC Line Fault self-cleaning
Power reduces the quantity of the power electronic devices needed for full-bridge submodule again.After MMC DC sides break down, rapid locking
Transverter can quickly block fault current, and the capacitance voltage of submodule can be kept in the case of no power consumption
It is constant, be conducive to the restarting after converter fault elimination and the foundation of DC voltage.But in Practical Project, submodule
With constant power load characteristic, the phenomenon for being gradually reduced and dissipating occurs in submodule capacitor voltage after converter blocking, finally
AC circuit breaker is caused to trip.In order to solve this problem, there is document to put forward the MMC DC side failures for full-bridge submodule
Traversing method, makes transverter keep controllable state during failure, is zero by controlling the positive and negative pole tension of DC side, and maintain
The balance of capacitance voltage, realizes the fault traversing of DC side.This method may be only available for full-bridge sub-modular structure, use
IGBT is one times more than semi-bridge type submodule.So urgently needing to propose a kind of new MMC-HVDC DC bipolars short circuit now
Fault ride-through method.
The content of the invention
Goal of the invention：For above-mentioned prior art, propose a kind of straight based on the bipolar equipotential MMC-HVDC of dc bus
Flow short-circuit fault ride-through method, controls upper and lower bridge arm voltage to prop up line voltage to reach control in the case where transverter is controllable
The purpose that dc-side short-circuit electric current processed is close to zero, and during fault traversing and maintain the balance of DC capacitor voltage.
Technical scheme：One kind is based on the bipolar equipotential MMC-HVDC direct-current short circuits fault ride-through method of dc bus, bag
Include following steps：
Step 1, detect whether occur DC bipolar short trouble, the control mode of transverter is by normally transporting after failure occurs
Row mode is switched to fault traversing pattern；
Step 2, operation troubles passes through pattern；
Step 3, judge whether the bipolar short trouble of DC side circuit has been removed, normal fortune is switched back into after fault clearance
Row mode, recovers power transmission.
As the preferred scheme of the present invention, the step 2 is comprised the following specific steps that：
Step 2.1, collection line voltage usa, usb, uscWith current on line side ia, ib, icAnd to line voltage and current on line side
Clark and Park conversion is carried out, the line voltage u of d axis components and q axis components is obtainedsd, usqWith current on line side id, iq；
Step 2.2, in collection MMC on three-phase in bridge arm each submodule capacitance voltage uALPi, uBLPi, uCLPiWith lower bridge
The capacitance voltage u of the submodule of each in armALNi, uBLNi, uCLNi, and the upper and lower bridge arm Neutron module capacitance voltage of three-phase is divided
Capacitance voltage sum u in bridge arm Xiang Jia not obtained on three-phaseALP, uBLP, uCLPWith bridge arm capacitance voltage sum u under three-phaseALN, uBLN,
uCLN, wherein i=1,2 ... n；
Step 2.3, according to the u obtained by step 2.1sa, usb, uscThe polarity of three-phase power grid voltage is judged, according to three-phase electricity
The polarity of net voltage is gone to judge and selects the locking and conducting of the corresponding upper and lower bridge arm of MMC modules three-phase, is specially：
A phase control methods are：
Work as usa>When 0, the whole lockings of IGBT of the upper bridge arm of A phases are controlled；The lower bridge arm of A phases is in the conduction state；
Work as usa<When 0, the whole lockings of IGBT of the lower bridge arm of A phases are controlled；The upper bridge arm of A phases is in the conduction state；
B phase control methods are：
Work as usb>When 0, the whole lockings of IGBT of the upper bridge arm of B phases are controlled；The lower bridge arm of B phases is in the conduction state；
Work as usb<When 0, the whole lockings of IGBT of the lower bridge arm of B phases are controlled；The upper bridge arm of B phases is in the conduction state；
C phase control methods are：
Work as usc>When 0, the whole lockings of IGBT of the upper bridge arm of C phases are controlled；The lower bridge arm of C phases is in the conduction state；
Work as usc<When 0, the whole lockings of IGBT of the lower bridge arm of C phases are controlled；The upper bridge arm of C phases is in the conduction state；
Step 2.4, in the conduction state upper and lower of MMC under fault traversing pattern is obtained according to step 2.2 and step 2.3
All submodule capacitor voltages in the upper and lower bridge arm of three-phase in the conduction state are added to obtain u by bridge armABCL；
Step 2.5, the u that will be obtained by step 2.4ABCLIt is multiplied by 1/3N and obtains institute in upper and lower bridge arm in the conduction state
There is the average value of submodule capacitor voltageWith the set-point of submodule capacitor voltageSubtractObtained by pi regulator
The set-point of current on line side d axis components under synchronous rotating frameAnd the reference value of given current on line side q axis componentsFor
Zero；Wherein, N is each bridge arm submodule number；
Step 2.6, the current on line side reference value that will be obtained by step 2.5Subtract the current on line side obtained by step 2.1
id, the d axis components of pi regulator output reference voltage are obtained by pi regulator
Step 2.7, the set-point of the q axis components of current on line side will be obtained by step 2.5Subtract and net is obtained by step 2.1
The q axis components i of side electric currentq, the q axis components of pi regulator output reference voltage are obtained by pi regulator
Step 2.8, by line voltage usdPlus ω (L+L0)iq, then subtract what is obtained by step 2.6Obtain modulation electricity
The d axis components of pressureLine voltage usqSubtract ω (L+L0)id, then subtract what is obtained by step 2.7Obtain modulation voltage q
Axis component WithFinal modulation voltage is obtained by Park inverse transformations and Clark inverse transformations
Step 2.9, modulation voltage step 2.8 obtainedModulating unit is sent into, obtains driving MMC three-phases
The control signal s of power device in upper and lower bridge arm in the conduction statea、sb、sc。
Beneficial effect：The method that the present invention puts forward is to be based on the bipolar equipotential MMC-HVDC direct currents side line of dc bus
The bipolar short trouble traversing method in road, as a result of such scheme, detects and event is quickly switched to after direct-current short circuit electric current
Hinder under operational mode, it is controllable in transverter according to the locking and conducting of the upper and lower bridge arm of Polarity Control MMC three-phases of line voltage
In the case of control upper and lower bridge arm voltage to prop up line voltage to reach that dc-side short-circuit fault electric current is close to zero and remains straight
Flow the purpose of the lateral capacitance balance of voltage.
The DC bipolar short trouble traversing method of the present invention, is based on the semi-bridge type with DC Line Fault self-cleaning ability
Topology is improved, the quantity of power electronic devices is reduced compared with full-bridge submodule.And without AC circuit breaker tripping operation, make to change
Stream device realizes fault traversing under controllable state, and maintains during fault traversing the balance of submodule capacitor voltage.Failure disappears
Can quick-recovery power transmission soon after removing.
Brief description of the drawings
Fig. 1 is the bipolar short trouble operational flow diagrams of MMC of the invention；
Fig. 2 is the control structure figure under the MMC failure operation patterns of the present invention；
Fig. 3 is single-ended MMC main circuit topological structures figure of the invention；
Fig. 4 improves topology diagram for the workable semi-bridge type with DC Line Fault self-cleaning ability of the present invention；(a) mix
Mould assembly submodule topological structure；(b) Clamp Shuangzi module topology structure；(c) series connection Shuangzi module topology structure；(d) two pole
Pipe Clamp submodule topological structure；(e) strengthen from resistance type submodule topological structure；
Fig. 5 controls situation map for the upper and lower bridge arm conducting switch of three-phase of the present invention；
Several sneak circuit figures when Fig. 6 is MMC failure operation of the invention；
Fig. 7 is the equivalent circuit diagram under the MMC failure operation patterns of the present invention；
Fig. 8 (a) is five level MMC DC side electric currents I of the inventiondcOscillogram；
Fig. 8 (a) is five level MMC DC voltages U of the inventiondcOscillogram；
Fig. 9 (a) is the five level MMC of present invention A phase submodule capacitor voltage oscillograms；
Fig. 9 (b) is the five level MMC of present invention B phase submodule capacitor voltage oscillograms；
Fig. 9 (c) is the five level MMC of present invention C phase submodule capacitor voltage oscillograms；
In Fig. 2,1, electric network source；2nd, modularization multi-level converter (MMC)；3rd, the detection unit of line voltage；4th, net
The detection unit of side electric current；5th, soft phase-locked loop unit；6th, the upper and lower bridge arm capacitance voltage detection unit 7 of MMC three-phases, outer voltage
Control unit；8th, current inner loop control unit；9th, CPS-PWM modulating units.
Embodiment
The present invention is done below in conjunction with the accompanying drawings and further explained.
One kind is based on the bipolar equipotential MMC-HVDC direct-current short circuits fault ride-through method of dc bus, as shown in figure 1, tool
Body implementation has three steps：Including 1, detect whether occur DC bipolar short trouble, transverter after failure occurs
Control mode switching is to fault traversing pattern；2nd, operation troubles passes through pattern 3, judges whether to release failure, is cut after fault clearance
Normal operation mode is gained, recovers power transmission.
Wherein, step 1 detects the fault curre of DC bipolar short circuit by current transformer, and fault current exceedes pre-
If after threshold values, the control mode of transverter is switched into fault traversing pattern by normal operation mode.
As shown in Fig. 2 the operation troubles of step 2 passes through mode process：
Step 2.1, collection line voltage usa, usb, uscWith current on line side ia, ib, icAnd to line voltage and current on line side
Clark and Park conversion is carried out, the line voltage u of d axis components and q axis components is obtainedsd, usqWith current on line side id, iq；
Step 2.2, in collection MMC on three-phase in bridge arm each submodule capacitance voltage uALPi, uBLPi, uCLPiWith lower bridge
The capacitance voltage u of the submodule of each in armALNi, uBLNi, uCLNi, and the upper and lower bridge arm Neutron module capacitance voltage of three-phase is divided
Capacitance voltage sum u in bridge arm Xiang Jia not obtained on three-phaseALP, uBLP, uCLPWith bridge arm capacitance voltage sum u under three-phaseALN, uBLN,
uCLN, wherein i=1,2 ... n；
Step 2.3, according to the u obtained by step 2.1sa, usb, uscThe polarity of three-phase power grid voltage is judged, according to three-phase electricity
The polarity of net voltage is gone to judge and selects the locking and conducting of the corresponding upper and lower bridge arm of three-phase, is specially：
A phase control methods are：
Work as usa>When 0, the whole lockings of IGBT of the upper bridge arm of A phases are controlled；The lower bridge arm of A phases is in the conduction state；
Work as usa<When 0, the whole lockings of IGBT of the lower bridge arm of A phases are controlled；The upper bridge arm of A phases is in the conduction state；
B phase control methods are：
Work as usb>When 0, the whole lockings of IGBT of the upper bridge arm of B phases are controlled；The lower bridge arm of B phases is in the conduction state；
Work as usb<When 0, the whole lockings of IGBT of the lower bridge arm of B phases are controlled；The upper bridge arm of B phases is in the conduction state；
C phase control methods are：
Work as usc>When 0, the whole lockings of IGBT of the upper bridge arm of C phases are controlled；The lower bridge arm of C phases is in the conduction state；
Work as usc<When 0, the whole lockings of IGBT of the lower bridge arm of C phases are controlled；The upper bridge arm of C phases is in the conduction state；
Step 2.4, in the conduction state upper and lower of MMC under fault traversing pattern is obtained according to step 2.2 and step 2.3
All submodule capacitor voltages in the upper and lower bridge arm of three-phase in the conduction state are added to obtain u by bridge armABCL；
Step 2.5, the u that will be obtained by step 2.4ABCLIt is multiplied by 1/3N and obtains institute in upper and lower bridge arm in the conduction state
There is the average value of submodule capacitor voltageWith the set-point of submodule capacitor voltageSubtractObtained by pi regulator
The set-point of current on line side d axis components under synchronous rotating frameAnd the reference value of given current on line side q axis componentsFor
Zero；
Step 2.6, the current on line side reference value that will be obtained by step 2.5Subtract the current on line side obtained by step 2.1
id, the d axis components of pi regulator output reference voltage are obtained by pi regulator
Step 2.7, the set-point of the q axis components of current on line side will be obtained by step 2.5Subtract and net is obtained by step 2.1
The q axis components i of side electric currentq, the q axis components of pi regulator output reference voltage are obtained by pi regulator
Step 2.8, by line voltage usdPlus ω (L+L0)iq, then subtract what is obtained by step 2.6Obtain modulation electricity
The d axis components of pressureLine voltage usqSubtract ω (L+L0)id, then subtract what is obtained by step 2.7Obtain modulation voltage q
Axis component WithFinal modulation voltage is obtained by Park inverse transformations and Clark inverse transformations
Step 2.9, modulation voltage step 2.8 obtainedModulating unit (9) (as shown in Figure 2) is sent into,
Obtain the control signal s of power device in driving MMC three-phases upper and lower bridge arm in the conduction statea、sb、sc。
Detect and judge whether short trouble is removed, if failure does not remove MMC and remains running in fault traversing pattern,
If failure has removed MMC operational mode by fault traversing pattern switching to normal operation mode, recover power transmission.
The general principle of the present invention is as follows：
Semi-bridge type based on DC Line Fault self-cleaning ability is improved after the whole lockings of IGBT in submodule MMC, can be rapid
Block dc-side short-circuit electric current, now transverter in stable state equivalent to having added one virtual to lead on the upper and lower bridge arm of three-phase
Open up pass Skp, Skn(k=a, b, c), virtual conducting switchs in the conduction state, the upper and lower bridge arm of MMC three-phases during MMC normal works
Virtual conducting switch is off during IGBT whole lockings, and equivalent MMC main circuit topologies are as shown in Figure 3.
U in Fig. 3skFor AC three-phase mains voltage (k=a, b, c)；L, R are resistance equivalent on AC power supply and circuit
It is anti-.ukoFor current conversion station outlet ac output voltage (k=a, b, c), ikFor AC three-phase current (k=a, b, c), O is exchange
The neutral point of side phase voltage, ukp, uknThe voltage of the upper and lower bridge arm of k phases, i are represented respectivelykp, iknThe upper and lower bridge of k phases is represented respectively
The electric current of arm, subscript p, n distinguish the upper bridge arm and lower bridge arm of many level current conversion stations of representation moduleization.L0For the bridge arm electricity of transverter
It is anti-, UdcFor DC voltage, IdcFor DC side electric current, P, N represent the both positive and negative polarity of current conversion station DC side respectively.
It can be write out according to Fig. 3, if AC power network can burst into fault current to DC side.Path that may be present
There are 6, can be obtained by Kirchhoff's second law：
U in formula (1)PNFor the dc bus voltage of positive and negative.
By Kirchhoff's current law (KCL)：
iap+ibp+icp=ian+ibn+icn=Idc (2)
I in formula (2)dcFor DC side electric current.
It can be obtained for three-phase equilibrium power network：
It can be obtained by the various addition of formula (1) divided by 2：
Abbreviation is obtained：
Converter DC-side fault traversing needs to meet uPN=0, Idc=0.
Then formula (5) can be turned to
(uap+ubp+ucp)+(uan+ubn+ucn)=0 (6)
MMC submodule redundancies are not considered, and the semi-bridge type with DC Line Fault self-cleaning ability improves topology, with full-bridge submodule
Block is different, and when submodule is in normal operating conditions, submodule can only export non-negative level, and the present invention is improved with semi-bridge type and opened up
Flutter structure-enhancing to analyze from exemplified by resistance type submodule, submodule is in normal operation mode, 0≤ukn, ukp≤NUc(k=a, b,
C), wherein UcFor submodule capacitor voltage, N is each bridge arm submodule number.
In the case of the upper and lower bridge arm not lockings of MMC, only work as uan=ubn=ucn=uap=ubp=ucp=0 up-to-date style (6)
It could set up, but now equivalent to AC three-phase shortcircuit, this method has document to use changing based on semi-bridge type submodule
Enter locking transverter after double-thyristor method, DC Line Fault, fault current flows through from IGCT, suppress the fault current of DC side,
But this method converts DC side failure for AC three phase short circuit fault, occur permanent fault and eventually result in exchange
Circuit breaker trip.DC side fault traversing can not be realized in the case where not making AC circuit breaker trip.
Wushu (4) is rewritten into following form and obtained：
If can meet
Converter DC-side fault traversing can be achieved,
Because, 0≤ukn, ukp≤NUc(k=a, b, c), control method is as follows：When AC phase voltage is in timing, locking
Bridge arm whole IGBT, the lower bridge arm voltage u of controlkn=usk, now control lower bridge arm current to be close to zero, ikn=ik≈0；Work as friendship
When flowing side phase voltage to bear, bridge arm voltage u in bridge arm whole IGBT, control under lockingkp=-usk, now control upper bridge arm current
It is close to zero, ikn=-ik≈ 0, this is to realize the bipolar short trouble traversing method of MMC DC sides.DC side electric current IdcFor MMC tri-
Upper bridge arm current sum mutually in the conduction state, or be MMC three-phases lower bridge arm current sum in the conduction state.Because
Upper and lower bridge arm current can control to be close to zero, so DC side electric current is not zero but fluctuated near zero.
From previous analysis, the locking of the upper and lower bridge arm of MMC three-phases and conducting situation, equivalent in six bridges of MMC three-phases
Arm has a virtual conducting switch S respectivelykp, Skn(k=a, b, c), actually these conducting switches are non-existent, and conducting is opened
Under pass corresponding relation is as shown in table 1：
Table 1
The conducting switch S of upper and lower bridge arm virtuallykp, Skn(k=a, b, c) is complementary on off state, Skp+Skn=1, wherein
The conducting switch S of the upper and lower bridge arm of MMC three-phases virtuallykp, Skn, one has six intervals in a power frequency period,
The situation of the upper and lower bridge arm lockings of different interval MMC and conducting is as shown in Figure 5：
When using based on enhancing from resistance type submodule MMC-HVDC DC bipolar short trouble traversing control methods, with the
It whether there is potential path when MMC failure operations are analyzed exemplified by three intervals, A phase voltages polarity is just, B phases is electric during 3rd interval
Polarity is pressed just, exemplified by C phase voltages polarity is the negative moment, to be turned on according to the lower bridge arm of control mode A phases, upper bridge arm locking, B phases
Lower bridge arm conducting, upper bridge arm locking, C phases upper bridge arm conducting, lower bridge arm locking.The DC network of AC system feed-in this moment or
The presence of transverter sneak circuit three is as shown in fig. 6, constitute through the upper and lower bridge arm of transverter two-phase and DC side failure arc road
Path 1 and path 2；The path 3 constituted through bridge arm in inverter inside two-phase (lower bridge arm).
There must be formula (9) establishment if path 1 has path
uD＞ 0 (9)
U in formula (9)DFor the pressure drop on the series diode of bridge arm equivalent in A phases.
According to Kirchhoff's second law：
U in formula (10)aoFor transverter A phase exit potentials, uPOIt is neutral to AC phase voltage for dc bus positive pole P points
Point O voltage.
But MMC output voltages modulation M is less than or equal to 1 during normal work,
U in formula (11)dcFor DC voltage, UphFor the amplitude of ac phase voltage, UcModule capacitance voltage, N is MMC mono-
The number of bridge arm submodule.
It can be obtained by formula (10) and formula (11)
Contradicted by formula (9) and formula (12) and understand that the path of path 1 is not present.
Other two paths take above-mentioned same analysis method, show that potential three paths are all not present.
To MMC shown in Fig. 3, according to fault ride-through method, the mathematical modeling of transverter is write out again.
V in formula (13)kFor k phases (k=a, b, c) upper and lower bridge arm voltage in the conduction state.
Ignore AC equivalent resistance, three phase static coordinate is carried out to formula (13) to two-phase rotating coordinate transformation (abc/dq)
In formula (13)：usd、usqRespectively d, q component of line voltage vector；vd、vqIt is respectively in the conduction state
D, q component of upper and lower bridge arm voltage vector；id、iqRespectively d, q component of current transformer current on line side vector；ω is power network angular frequency
Rate.
Path during MMC failure operations is analyzed by taking 3rd interval as an example, A phase voltages polarity is just, B phases is electric during 3rd interval
It is just, exemplified by C phase voltages polarity is the negative moment, according to the whole lockings of the upper bridge arm IGBT of control mode A phases, under control to press polarity
Bridge arm voltage uan=va, the whole lockings of upper bridge arm IGBT of B phases, the lower bridge arm voltage u of controlbn=vb, the lower bridge arm IGBT of C phases is complete
Bridge arm voltage u in portion's locking, controlcp=-vc.Therefore the MMC run in a failure mode can be equivalent to chain type wye connection
When control, P points and N point current potential approximately equals, as shown in Figure 7.
It is above-mentioned based on the bipolar equipotential MMC DC bipolar short trouble traversing methods of dc bus in order to verify,
Single-ended five level MMC-HVDC systems are built in PSCAD softwares and carry out simulating, verifying.Simulation parameter is as shown in table 2：
Table 2
Put into when Fig. 8 (a), (b) are 0.51s after the MMC generations bipolar short trouble of DC side, 0.513s proposed by the present invention
DC side electric current I after bipolar short trouble traversing methoddcWith DC voltage UdcWaveform, can be seen that from Fig. 8 (a), (b)
DC side electric current increases sharply after DC side failure occurs, and DC voltage moment drops to zero, and this hair is put into after 0.513s
After the bipolar short trouble traversing method of bright proposition, dc-side short-circuit electric current IdcIt is quick to reduce, I during stable statedcIn the scope of very little
Interior fluctuation, makes transverter realize DC side fault traversing in the case of controllable.
The input present invention is carried after the MMC generations bipolar short trouble of DC side, 0.513s when Fig. 9 (a), (b), (c) are 0.51s
A, B, C three-phase submodule capacitor voltage waveform after the bipolar short trouble traversing method gone out, can from Fig. 9 (a), (b), (c)
Go out submodule capacitor voltage and be able to maintain that the fluctuation near rated value, be conducive to DC voltage after the failure solution of transverter
Set up.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (2)
1. one kind is based on the bipolar equipotential MMC-HVDC direct-current short circuits fault ride-through method of dc bus, it is characterised in that bag
Include following steps：
Step 1, detect whether occur DC bipolar short trouble, the control mode of transverter is by normally running mould after failure occurs
Formula is switched to fault traversing pattern；
Step 2, operation troubles passes through pattern；
Step 3, judge whether the bipolar short trouble of DC side circuit has been removed, normal operation mould is switched back into after fault clearance
Formula, recovers power transmission.
2. according to claim 1 passed through based on the bipolar equipotential MMC-HVDC DC bipolars short trouble of dc bus
Method, it is characterised in that the step 2 is comprised the following specific steps that：
Step 2.1, collection line voltage usa, usb, uscWith current on line side ia, ib, icAnd line voltage and current on line side are carried out
Clark and Park conversion, obtains the line voltage u of d axis components and q axis componentssd, usqWith current on line side id, iq；
Step 2.2, in collection MMC on three-phase in bridge arm each submodule capacitance voltage uALPi, uBLPi, uCLPiIn lower bridge arm
The capacitance voltage u of each submoduleALNi, uBLNi, uCLNi, and phase respectively is carried out to the upper and lower bridge arm Neutron module capacitance voltage of three-phase
Plus obtain on three-phase capacitance voltage sum u in bridge armALP, uBLP, uCLPWith bridge arm capacitance voltage sum u under three-phaseALN, uBLN, uCLN,
Wherein i=1,2 ... n；
Step 2.3, according to the u obtained by step 2.1sa, usb, uscThe polarity of three-phase power grid voltage is judged, according to three phase network electricity
The polarity of pressure is gone to judge and selects the locking and conducting of the corresponding upper and lower bridge arm of MMC modules three-phase, is specially：
A phase control methods are：
Work as usa>When 0, the whole lockings of IGBT of the upper bridge arm of A phases are controlled；The lower bridge arm of A phases is in the conduction state；
Work as usa<When 0, the whole lockings of IGBT of the lower bridge arm of A phases are controlled；The upper bridge arm of A phases is in the conduction state；
B phase control methods are：
Work as usb>When 0, the whole lockings of IGBT of the upper bridge arm of B phases are controlled；The lower bridge arm of B phases is in the conduction state；
Work as usb<When 0, the whole lockings of IGBT of the lower bridge arm of B phases are controlled；The upper bridge arm of B phases is in the conduction state；
C phase control methods are：
Work as usc>When 0, the whole lockings of IGBT of the upper bridge arm of C phases are controlled；The lower bridge arm of C phases is in the conduction state；
Work as usc<When 0, the whole lockings of IGBT of the lower bridge arm of C phases are controlled；The upper bridge arm of C phases is in the conduction state；
Step 2.4, the upper and lower bridge arms in the conduction state of MMC under fault traversing pattern are obtained according to step 2.2 and step 2.3,
All submodule capacitor voltages in the upper and lower bridge arm of three-phase in the conduction state are added to obtain uABCL；
Step 2.5, the u that will be obtained by step 2.4ABCLIt is multiplied by 1/3N and obtains all submodules in upper and lower bridge arm in the conduction state
The average value of block capacitance voltageWith the set-point of submodule capacitor voltageSubtractSynchronous rotation is obtained by pi regulator
Turn the set-point of current on line side d axis components under coordinate systemAnd the reference value of given current on line side q axis componentsIt is zero；Its
In, N is each bridge arm submodule number；
Step 2.6, the current on line side reference value that will be obtained by step 2.5Subtract the current on line side i obtained by step 2.1d, warp
Cross the d axis components that pi regulator obtains pi regulator output reference voltage
Step 2.7, the set-point of the q axis components of current on line side will be obtained by step 2.5Subtract and net side electricity is obtained by step 2.1
The q axis components i of streamq, the q axis components of pi regulator output reference voltage are obtained by pi regulator
Step 2.8, by line voltage usdPlus ω (L+L0)iq, then subtract what is obtained by step 2.6Obtain modulation voltage
D axis componentsLine voltage usqSubtract ω (L+L0)id, then subtract what is obtained by step 2.7Obtain modulation voltage q axles point
Amount WithFinal modulation voltage is obtained by Park inverse transformations and Clark inverse transformations
Step 2.9, modulation voltage step 2.8 obtainedModulating unit is sent into, driving MMC three-phases is obtained and is in
The control signal s of power device in the upper and lower bridge arm of conducting statea、sb、sc。
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| CN107887923A (en) * | 2017-11-16 | 2018-04-06 | 南方电网科学研究院有限责任公司 | Double-pole short-circuit fault analysis method for MMC-HVDV power transmission system |
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