CN105826924A - Series-parallel combined compensator and method of restraining high voltage direct current (HVDC) commutation failure - Google Patents
Series-parallel combined compensator and method of restraining high voltage direct current (HVDC) commutation failure Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
- H02J3/1857—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters wherein such bridge converter is a multilevel converter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The present invention provides a series-parallel combined compensator and method of restraining high voltage direct current (HVDC) commutation failure. The series-parallel combined compensator is arranged between an HVDC system inverter side AC bus and a receiving-end grid, and comprises an exchange unit, and an output voltage control unit and an output current control unit which are connected mutually. The method is characterized by determining a receiving-end grid fault, carrying out the coordination and optimization control, generating a control instruction and controlling according to a voltage signal. The compensator and the method provided by the present invention effectively compensate the voltage drop of a DC power transmission system inverter side AC bus when the receiving-end grid fault occurs, enable the line transmission capability to be improved, restrain the commutation failure, and guarantee the reliable and stable operation of a HVDC power transmission system.
Description
Technical field
The present invention relates to power system high-voltage dc transmission electrical domain, be specifically related to a kind of suppress HVDC commutation failure string-
Parallel combination compensator and method.
Background technology
Line commutation D.C. high voltage transmission (Line-Commutated-Converter High Voltage based on IGCT
Direct Current, LCC-HVDC) system has that transmission line capability is big, circuit cost networked capabilities low, asynchronous strong,
Have great advantage at aspect tools such as long-distance and large-capacity power transmission and big area networkings and be widely used in China's power system.
Commutation failure is one of modal fault of LCC-HVDC system.The reason causing commutation failure fault has a lot,
But when IGCT and triggering system thereof the most normally work, the main cause that commutation failure occurs is when receiving end electrical network occurs event
The grid voltage sags caused during barrier or fluctuation.
Disclosed " the defence side of a kind of Communication Failure in HVDC Transmission Lines of the Chinese patent of Publication No. CN103337870A
Method ", instructed to Control protection system, touching at Control protection system by its commutation failure system of defense output square wave
Send out in the instruction of angle and deduct this square wave, trigger IGCT in advance.The method is a kind of commutation failure defence increasing and closing the angle of rupture
Measure.
Disclosed " a kind of direct current transportation commutation based on electric current lambda limiting process of the Chinese patent of Publication No. CN103737907A
Failure defence method ", using when there is AC network fault, suppressing to change by the method reducing DC current instruction
Failure mutually.The method can avoid the power-factor angle triggering the increase DC current brought in advance, increasing DC transmission system
Etc. adverse effect, make the commutation area needed for IGCT reduce, be conducive to defence DC transmission system generation commutation failure event
Barrier.But, owing to LCC-HVDC dc bus is in series with the smoothing reactor of larger capacity, its electric current decrease speed
Relatively slow, therefore the response speed of the method suppression commutation failure is relatively slow.
Said method mainly increases and closes the angle of rupture or reduce DC current, can as the auxiliary mean of defense of commutation failure, but
Cannot fundamentally avoid the generation of commutation failure.
" the height containing STATCOM in " High-Voltage Technology " volume 40 the 8th phase 2440-2448 page publication in 2014
Pressure DC transmission system control method " one literary composition (author Zhao Chengyong etc.) propose containing SVC (STATCOM)
HVDC system control method, when receiving end electrical network three-phase fault causes three-phase voltage to fall, the method can reduce
The probability of happening of commutation failure, but it is suitable only for the operating mode that receiving end electric network fault is lighter, when grid voltage sags is more serious,
Then required for compensation Voltage Drop, STATCOM capacity can be the biggest.
Summary of the invention
In view of this, a kind of series-multiple connection combined compensation device suppressing HVDC commutation failure of present invention offer and method,
This compensator and method achieve the effective compensation DC transmission system inverter side ac bus when receiving end grid collapses
Voltage Drop, improve line transmission ability and suppress the generation of commutation failure, it is ensured that HVDC transmission system can
Lean on and stable operation.
It is an object of the invention to be achieved through the following technical solutions:
A kind of series-multiple connection combined compensation device suppressing HVDC commutation failure, described series-multiple connection combined compensation device is arranged on
Between HVDC system inverter side ac bus and receiving end electrical network, and described series-multiple connection combined compensation device include crosspoint,
Interconnective output voltage control unit and output current control unit；
Described output voltage control unit is connected between described inverter side ac bus and receiving end electrical network；
Described output current control unit is connected in parallel on described inverter side ac bus or on the bus of receiving end electrical network；
Described output voltage control unit and output current control unit are connected to described crosspoint.
Preferably, described crosspoint includes friendship-alternating current source converter and is connected to the control of described friendship-alternating current source converter
Device, described output voltage control unit is a series side transformator, and described output current control unit is a side in parallel
Transformator；
Described friendship-alternating current source converter is provided with three-phase input end and three-phase output end；
Described series side transformator is connected with the three-phase input end of described friendship-alternating current source converter；
Described side transformer in parallel is connected with the three-phase output end of described friendship-alternating current source converter.
Preferably, described friendship-alternating current source converter includes the side in parallel Modular multilevel converter connected with dc bus
And series side Modular multilevel converter；
Described side Modular multilevel converter in parallel and series side Modular multilevel converter be three-phase bridge structure and
All include brachium pontis and lower brachium pontis on three-phase；
Described upper brachium pontis and lower brachium pontis all include that half-bridge submodule string and reactor, described half-bridge submodule string include multiple depending on
The half-bridge submodule of secondary series connection；
The reactor of described upper brachium pontis is connected on the end of the half-bridge submodule string of described upper brachium pontis, the reactance of described lower brachium pontis
Device is connected on the head end of the half-bridge submodule string of described lower brachium pontis；
The reactor of described upper brachium pontis be connected with the reactor of described lower brachium pontis and each junction point to be respectively described modularity many
The input of each phase of level converter AC；
The head end of the half-bridge submodule string of described upper brachium pontis is all connected with positive direct-current bus；
The end of the half-bridge submodule string of described lower brachium pontis is all connected with negative dc bus.
Preferably, described half-bridge submodule includes two power switch pipes and the capacitor of series connection, and described capacitor and two
Individual described power switch pipe place branch circuit parallel connection；
It is provided with anti-paralleled diode in described power switch pipe；
The two ends of one of them described power switch pipe are respectively two outfans of described half-bridge submodule.
Preferably, described friendship-alternating current source converter is modular multilevel matrix converter, and described modular multilevel
The internal structure of matrix converter is 3x3 matrix structure；
Being provided with nine power train in described modular multilevel matrix converter, described power train includes the reactance being sequentially connected in series
Device and multiple H bridge submodule, and the two ends of described power train are respectively the first outfan and the second outfan；
First outfan of each described power train is all with the input of the described each phase of modular multilevel matrix converter even
Connect, and the second outfan of each described power train is all with the outfan of the described each phase of modular multilevel matrix converter even
Connect.
Preferably, described H bridge submodule includes capacitor and two power switch pipe branch roads, and two power switch
Capacitor described in Guan Junyu is in parallel；Article one, described power switch pipe branch road is in series with the first power switch pipe and the second power
Switching tube, another article of described power switch pipe branch road is in series with the 3rd power switch pipe and the 4th power switch pipe；
The emitter stage of described first power switch pipe is respectively connecting to the colelctor electrode of described second power switch pipe and described H
First outfan of bridge submodule, and the positive pole of the colelctor electrode described capacitor of connection of described first power switch pipe；Described
The emitter stage of the second power switch pipe connects the negative pole of described capacitor；
The emitter stage of described 3rd power switch pipe is respectively connecting to the colelctor electrode of described 4th power switch pipe and described H
Second outfan of bridge submodule, and the positive pole of the colelctor electrode described capacitor of connection of described 3rd power switch pipe, described
The emitter stage of the 4th power switch pipe connects the negative pole of described capacitor.
Preferably, described controller includes the voltage detection unit being in communication with each other, fault distinguishing unit, coordinates control unit
And internal ring regulation and control unit；
Described voltage detection unit, for described HVDC system inverter side ac bus voltage and receiving end line voltage
Detect, obtain described receiving end mains voltage signal；
Described fault distinguishing unit, is used for analyzing described receiving end mains voltage signal, and judges whether described receiving end electrical network is sent out
Raw fault；
Described coordination control unit, for the operation conditions according to described receiving end electrical network, to described series-multiple connection combined compensation
Described output current control unit and the output current control unit of device coordinate and optimal control, generate described output electricity
The output voltage instruction of pressure control unit and the output reactive component of current instruction of described output current control unit；
Described internal ring regulation and control unit, for according to the instruction of described output voltage and output reactive component of current instruction, the most real
The existing output voltage control of described output voltage control unit, the output electric current of described output current control unit control, son
Module capacitance Control of Voltage and power switch pipe trigger and control.
A kind of method suppressing HVDC commutation failure, described method is with being arranged on HVDC system inverter side ac bus
And the series-multiple connection combined compensation device between receiving end electrical network realizes, and described series-multiple connection combined compensation device includes crosspoint, phase
The output voltage control unit connected and output current control unit；Described output voltage control unit is connected on described inverse
Become between side ac bus and receiving end electrical network；Described output current control unit be connected in parallel on described inverter side ac bus or
On the bus of receiving end electrical network；It is single that described output voltage control unit and output current control unit are connected to described exchange
Unit；Described crosspoint includes friendship-alternating current source converter and is connected to the controller of described friendship-alternating current source converter；Described
Controller includes the voltage detection unit being in communication with each other, fault distinguishing unit, coordinates control unit and internal ring regulation and control unit；
Described method comprises the steps:
Voltage detection unit described in step 1. detects inverter side ac bus voltage and receiving end electrical network in described HVDC system
Voltage signal；
Inverter side ac bus voltage described in fault distinguishing element analysis described in step 2. and receiving end mains voltage signal, sentence
Whether disconnected described receiving end electrical network breaks down；
The most then enter step 3；
If it is not, then enter step 4；
Described in step 3., coordination control unit is with compensation network Voltage Drop as target, according to described receiving end operation of power networks shape
Condition and the output signal of described fault distinguishing unit, carried out described output voltage control unit and output current control unit
Coordinate and optimal control；Generate control instruction, enter step 5；
Described in step 4., coordination control unit is with compensating reactive power as target, controls described output voltage control unit and output
Current control unit realizes connect reactive-load compensation and parallel reactive compensation respectively；Generate control instruction, enter step 5；
Described in step 5., internal ring regulation and control unit is according to described control instruction, realizes the output of described voltage control unit respectively
Control of Voltage, the output electric current of described output current control unit control, submodule capacitor voltage controls and power switch
Pipe triggers and controls.
Preferably, described step 3 includes:
Described in 3-1., coordination control unit is with compensation network Voltage Drop as target, according to described receiving end electric network fault situation,
The voltage compensation quantity of described output voltage control unit and output current control unit is coordinated and optimizes；
To default ac bus voltage setting valve and measured value compares and computing to coordinate control unit described in 3-2., point
Do not generate the output voltage instruction signal of described output voltage control unit and the output electricity of described output current control unit
Stream idle component instruction, enters step 5.
Preferably, described step 4 includes:
Described in 4-1., coordination control unit is with compensating reactive power as target, described output voltage control unit compensation grid line roadlock
Anti-, it is achieved series connection reactive-load compensation, described output current control unit is according to HVDC System Reactive Power demand, it is achieved in parallel
Reactive-load compensation；
Output voltage control unit described in 4-2. and output current control unit generate output voltage instruction signal and electricity respectively
Stream idle component instruction, enters step 5.
From above-mentioned technical scheme it can be seen that the invention provides a kind of series-multiple connection group suppressing HVDC commutation failure
Closing compensator and method, this compensator is arranged between HVDC system inverter side ac bus and receiving end electrical network, and string-
Parallel combination compensator includes crosspoint, interconnective output voltage control unit and output current control unit；Should
Method is according to voltage signal；Judge receiving end electric network fault, and coordinate and optimal control, generate control instruction and carry out
Control.Compensator and method that the present invention proposes achieve the effective compensation DC transmission system when receiving end grid collapses
The Voltage Drop of inverter side ac bus, improves line transmission ability and suppresses the generation of commutation failure, it is ensured that high straightening
Reliable and the stable operation of stream transmission system.
With immediate prior art ratio, the technical scheme that the present invention provides has a following excellent effect:
1, in technical scheme provided by the present invention, when receiving end grid collapses, mend by controlling series-multiple connection combination
Repay the series side output voltage of device, energy effective compensation grid voltage sags, thus suppress the generation of commutation failure, will simultaneously
The wattful power power side in parallel that series side absorbs exports electrical network.
2, technical scheme provided by the present invention, when receiving end electrical network is properly functioning, by controlling series-multiple connection combined compensation
The series side output voltage of device, energy effective compensation line impedance, it is achieved series connection no-power compensation function, improves line transmission energy
Power, side the most in parallel can be used for exporting reactive current, it is achieved the free function of parallel reactive.
3, technical scheme provided by the present invention, when receiving end grid collapses, if individually using series compensator
Compensation network Voltage Drop, then require that series compensator has the ability absorbing active power, the most existing dynamic electric voltage
Restorer cannot meet this requirement, and uses series-multiple connection combined compensation device the active power that part in series absorbs to be led to
Cross side in parallel and export electrical network.
4, technical scheme provided by the present invention, the electrical network of existing independent employing parallel reactive generator STATCOM
Voltage Drop compensation scheme, is by improving access point voltage to access point injection capacitive reactive power electric current, but is appropriate only for
The operating mode that Voltage Drop is lighter；And the employing series-multiple connection combined compensation device grid voltage sags compensation scheme of the present invention, can
To coordinate and to optimize the compensation capacity of series connection and parallel connection part, than independent STATCOM, there is broader voltage compensation model
Enclose.
5, the technical scheme that the present invention provides, is widely used, has significant Social benefit and economic benefit.
Accompanying drawing explanation
Fig. 1 is a kind of main wiring diagram of the series-multiple connection combined compensation device of the suppression HVDC commutation failure of the present invention；
Fig. 2 is the another kind of main wiring diagram of the series-multiple connection combined compensation device of the suppression HVDC commutation failure of the present invention；
Fig. 3 is the A-A transducer topological diagram of Modular multilevel converter (MMC)；
Fig. 4 is half-bridge submodule topology diagram；
Fig. 5 is the A-A transducer topological diagram based on modular multilevel matrix converter (M3C) of the present invention；
Fig. 6 is the M3C power train structure chart of the present invention；
Fig. 7 is the H bridge submodule topology diagram of the present invention；
Fig. 8 is the controller block diagram of the present invention；
Fig. 9 is the flow chart of a kind of method suppressing HVDC commutation failure of the present invention；
Figure 10 be the present invention series-multiple connection combined compensation method in the schematic flow sheet of step 3；
Figure 11 be the present invention series-multiple connection combined compensation method in the schematic flow sheet of step 4.
Wherein, 1-HVDC system inverter side；2-ac bus；3-receiving end electrical network；4-controller；5-string-also combines benefit
Repay device；501-output voltage control unit；502-exports current control unit；503-crosspoint；6-friendship-alternating current source becomes
Parallel operation；7-series side transformator；8-parallel connection side transformer；9-half-bridge submodule；901-power switch pipe；10-parallel connection side
Modular multilevel converter；C-capacitor；11-series side Modular multilevel converter；L-reactor；12-power
Chain；13-H bridge submodule；14-voltage detection unit；15-fault distinguishing unit；16-coordinates control unit；17-internal ring
Regulation and control unit；S1-the first power switch pipe；S2-the second power switch pipe；S3-the 3rd power switch pipe；S4-the 4th merit
Rate switching tube.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground describes, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Base
In embodiments of the invention, those of ordinary skill in the art obtained under not making creative work premise all its
His embodiment, broadly falls into the scope of protection of the invention.
As it is shown in figure 1, the present invention provides the main electrical scheme of a kind of series-multiple connection combined compensation device suppressing HVDC commutation failure
Figure, series-multiple connection combined compensation device 5 is arranged between HVDC system inverter side 1 ac bus 2 and receiving end electrical network 3,
And series-multiple connection combined compensation device 5 includes crosspoint 503, interconnective output voltage control unit 501 and output electricity
Flow control unit 502；
Output voltage control unit 501 is connected between inverter side 1 ac bus 2 and receiving end electrical network 3；
Output current control unit 502 is connected in parallel on inverter side 1 ac bus 2；
Output voltage control unit 501 and output current control unit 502 are connected to crosspoint 503；
Wherein, crosspoint 503 includes friendship-alternating current source converter 6 and connects the controller of best friend-alternating current source converter 6
4, output voltage control unit 501 is a series side transformator 7, and output current control unit 502 is a parallel connection
Side transformer 8；
Friendship-alternating current source converter 6 is provided with three-phase input end and three-phase output end；
Series side transformator 7 is connected with the three-phase input end of friendship-alternating current source converter 6；
Side transformer 8 in parallel is connected with the three-phase output end of friendship-alternating current source converter 6；
The i.e. output current control unit 502 of string-combined compensation device 5 is connected on direct current transportation by series side transformator 7
Between system inverter side 1 ac bus 2 and receiving end electrical network 3, the output current control unit 502 of string-combined compensation device 5 leads to
Crossing side transformer 8 in parallel to be connected in parallel on receiving end electrical network 3 bus, controller 4 controls string-the friendship-alternating current source of combined compensation device 5
Changer 6, produces at series transformer outfan respectively and compensates voltage and shunt transformer outfan generation compensation electric current.
As in figure 2 it is shown, the present invention provides the another kind of a kind of series-multiple connection combined compensation device suppressing HVDC commutation failure
Main wiring diagram,
Wherein, output current control unit 502 is connected in parallel on the bus of receiving end electrical network 3；
I.e. to be connected on direct current by series side transformator 7 defeated for the output voltage control unit 501 of string-combined compensation device 5
Between electricity system inverter side 1 ac bus 2 and receiving end AC network 3, string-the output electric current control of combined compensation device 5
Unit 502 processed side transformer 8 in parallel is connected in parallel on the ac bus 2 of inverter side 1, controller 4 control string-and
The friendship of combined compensation device 5-alternating current source converter 6, produces at series transformer outfan respectively and compensates voltage and parallel pressure change
Device outfan produces and compensates electric current.
As it is shown on figure 3, the present invention provides a kind of main of friendship-alternating current source converter 6 in a kind of series-multiple connection combined compensation device to connect
Line chart, friendship-alternating current source converter 6 includes side in parallel Modular multilevel converter 10 and the series connection connected with dc bus
Side Modular multilevel converter 11；
Side in parallel Modular multilevel converter 10 and series side Modular multilevel converter 11 be three-phase bridge structure and
All include brachium pontis and lower brachium pontis on three-phase；
Upper brachium pontis and lower brachium pontis all include that half-bridge submodule string and reactor L, half-bridge submodule string include multiple being sequentially connected in series
Half-bridge submodule 9；
The reactor L of upper brachium pontis is connected on the end of the half-bridge submodule string of brachium pontis, the reactor L series connection of lower brachium pontis
Head end at the half-bridge submodule string of lower brachium pontis；
The reactor L of upper brachium pontis is connected with the reactor L of lower brachium pontis and each junction point is respectively modular multilevel and becomes
The input of each phase of parallel operation AC；
The head end of the half-bridge submodule string of upper brachium pontis is all connected with positive direct-current bus；
The end of the half-bridge submodule string of lower brachium pontis is all connected with negative dc bus；
I.e. friendship-alternating current source converter 6 includes the Modular multilevel converter (MMC) that two " back-to-back " connect, its
Middle side in parallel Modular multilevel converter 10 and series side Modular multilevel converter 11 are by by positive direct-current bus
Connect.Modular multilevel converter (MMC) is three-phase bridge structure, including brachium pontis on three-phase and lower brachium pontis, described
Brachium pontis includes that N number of half-bridge submodule (HBSM), N number of half-bridge submodule HBSM series connection are connected with reactor L, on
The reactor L of brachium pontis is connected with the reactor L of lower brachium pontis, and its junction point is as Modular multilevel converter (MMC)
The input of AC one phase, first half-bridge submodule of upper brachium pontis is connected with positive direct-current bus, the N of lower brachium pontis
Individual half-bridge submodule is connected with negative dc bus.
As shown in Figure 4, half-bridge submodule 9 includes two power switch pipes 901 and the capacitor C of series connection, and capacitor
C and two power switch pipe 901 place branch circuit parallel connections；
It is equipped with anti-paralleled diode in each power switch pipe 901；
The two ends of one of them power switch pipe 901 are respectively two outfans of half-bridge submodule 9；
I.e. half-bridge submodule 9 includes 2 power switch pipes 901 with anti-paralleled diode and capacitor C, aobvious in its Fig. 4
The upper power switch pipe shown and lower power switch pipe are in parallel with electric capacity C after connecting, and the two ends of up or down power switch pipe are
Two outfans of half-bridge submodule.
As it is shown in figure 5, the present invention provides the another kind of master of friendship-alternating current source converter 6 in a kind of series-multiple connection combined compensation device
Wiring diagram, wherein, friendship-alternating current source converter 6 is modular multilevel matrix converter (M3C), and how electric modularity is
The internal structure of flat matrix converter is 3x3 matrix structure；
Being provided with nine M3C power train 12 in modular multilevel matrix converter (M3C), power train 12 includes depending on
The reactor L of secondary series connection and multiple H bridge submodule 13, and the two ends of power train 12 are respectively the first outfan and second
Outfan；
As shown in Figure 6, the first outfan of each power train 12 all with modular multilevel matrix converter (M3C)
The input of each phase connects, and the second outfan of each power train 12 all with modular multilevel matrix converter
(M3C) outfan of each phase connects.
I.e. power train 12 is in series with N number of H bridge submodule (FBSM) 13 by reactor L, and one end of reactor L is power
First outfan of chain 12, the other end of reactor L connects the first outfan of a H bridge submodule 13, H bridge
Second outfan of module 13 connects the first outfan of the second submodule 13, and the second outfan of the second submodule 13 connects
First outfan of the 3rd H bridge submodule 13, by that analogy, the second outfan of (N-1) H bridge submodule 13 is connected to
First outfan of n-th H bridge submodule 13, the second outfan is power train 12 the second of n-th H bridge submodule 13
Outfan.
As it is shown in fig. 7, H bridge submodule 13 includes capacitor C and two power switch pipe branch roads, and two power are opened
Close Guan Junyu capacitor C in parallel；Article one, power switch pipe branch road is in series with the first power switch tube S 1 and the second power
Switching tube S2, another article of power switch pipe branch road is in series with the 3rd power switch tube S 3 and the 4th power switch tube S 4；
The emitter stage of the first power switch tube S 1 is respectively connecting to colelctor electrode and the H bridge submodule of the second power switch tube S 2
First outfan of block 13, and the positive pole of the colelctor electrode connection capacitor C of the first power switch tube S 1；Second power
The emitter stage of switching tube S2 connects the negative pole of capacitor C；
The emitter stage of the 3rd power switch tube S 3 is respectively connecting to colelctor electrode and the H bridge submodule of the 4th power switch tube S 4
Second outfan of block 13, and the positive pole of the colelctor electrode connection capacitor C of the 3rd power switch tube S 3, the 4th power
The emitter stage of switching tube S4 connects the negative pole of capacitor C；
I.e. H bridge submodule 13 includes 4 power switch pipes with anti-paralleled diode and capacitor C, wherein, the first merit
The emitter stage of rate switching tube S1 and the second power switch tube S 2 colelctor electrode connect, and connect the first defeated of described H bridge submodule
Going out end, the colelctor electrode of the first power switch tube S 1 connects the positive pole of capacitor C, and the emitter stage of the second power switch tube S 2 is even
Connect the negative pole of capacitor C；
The emitter stage of the 3rd power switch tube S 3 and the 4th power switch tube S 4 colelctor electrode connect, and connect described H bridge submodule
Second outfan of block, the colelctor electrode of the 3rd power switch tube S 3 connects the positive pole of capacitor C, the 4th power switch tube S 4
Emitter stage connect capacitor C negative pole.
As shown in Figure 8, controller 4 includes the voltage detection unit 14 being in communication with each other, fault distinguishing unit 15, coordinates
Control unit 16 and internal ring regulation and control unit 17；
Voltage detection unit 14, for HVDC system inverter side 1 ac bus 2 voltage and receiving end electrical network 3 voltage
Detect, obtain receiving end electrical network 3 voltage signal；
Fault distinguishing unit 15, is used for analyzing receiving end electrical network 3 voltage signal, and judges whether receiving end electrical network 3 occurs event
Barrier；
Coordinate control unit 16, for according to the operation conditions of receiving end electrical network 3, defeated to series-multiple connection combined compensation device 5
Go out current control unit 501 and output current control unit 502 coordinates and optimal control, generate output voltage control
The output voltage instruction of unit 501 and the output reactive component of current instruction of output current control unit 502；
Internal ring regulation and control unit 17, for according to output voltage instruction and output reactive component of current instruction, realizing defeated respectively
Go out the output voltage control of voltage control unit 502, the output electric current of output current control unit 503 controls, submodule
Capacitance voltage controls and the triggering of power switch pipe 901 controls；
I.e. voltage detection unit 14, for entering DC transmission system inverter side ac bus 2 voltage and receiving end electrical network 3 voltage
Row detection；Fault distinguishing unit 15, for being analyzed the three-phase voltage signal Ug of voltage detection unit 14 output, sentences
Whether other receiving end electrical network 3 breaks down；Coordinate control unit 16, for the operation conditions according to receiving end electrical network 3, to described
Series-multiple connection combined compensation device 5 is connected and is exported current control unit 502 and coordinates and optimal control, defeated needed for generation
Go out voltage control unit 501 output voltage instruction Δ U*Reactive component of current instruction is exported with output current control unit 502
Internal ring regulation and control unit 17, instructs Δ U for the output voltage according to output voltage control unit 501*With output electric current
The output current-order idle component of control unit 502Distinctly realize described series-multiple connection combined compensation device 5 output voltage
Control unit 501 output voltage control, output current control unit 502 export electric current control, submodule capacitor voltage controls
And power switch pipe triggers and controls.
As it is shown in figure 9, the present invention provides a kind of method suppressing HVDC commutation failure, method is with being arranged on HVDC
Series-multiple connection combined compensation device 5 between system inverter side 1 ac bus 2 and receiving end electrical network 3 realizes, and series-multiple connection combines
Compensator 5 includes crosspoint 503, interconnective output voltage control unit 501 and output current control unit
502；Output voltage control unit 501 is connected between inverter side 1 ac bus 2 and receiving end electrical network 3；Output electric current
Control unit 502 is connected in parallel on inverter side 1 ac bus 2 or on the bus of receiving end electrical network 3；Output voltage control unit
501 and output current control unit 502 be connected to crosspoint 503；
Crosspoint 503 includes friendship-alternating current source converter 6 and connects the controller 4 of best friend-alternating current source converter 6；Control
Device 4 processed includes the voltage detection unit 14 being in communication with each other, fault distinguishing unit 15, coordinates control unit 16 and internal ring tune
Control unit 17；
Comprise the steps:
Step 1. detects inverter side 1 ac bus 2 voltage and receiving end electrical network 3 voltage signal in HVDC system；
Step 2. analyzes inverter side 1 ac bus 2 voltage and receiving end electrical network 3 voltage signal, it is judged that receiving end electrical network 3 is
No break down；
The most then enter step 3；
If it is not, then enter step 4；
Step 3. coordinates control unit 16 with compensation network Voltage Drop as target, according to receiving end electrical network 3 operation conditions and
The output signal of fault distinguishing unit 15, is carried out output voltage control unit 501 and output current control unit 502
Coordinate and optimal control；Generate control instruction, enter step 5；
Step 4. coordinates control unit 16 with compensating reactive power as target, controls output voltage control unit 501 and output electricity
Flow control unit 502 realizes connect reactive-load compensation and parallel reactive compensation respectively；Generate control instruction, enter step 5；
Step 5. internal ring regulation and control unit 17, according to control instruction, realizes the output voltage control of voltage control unit 501 respectively
System, the output electric current of output current control unit 502 control, submodule capacitor voltage controls and power switch pipe triggers
Control.
As shown in Figure 10, step 3 includes:
3-1. coordination control unit 16 is with compensation network Voltage Drop as target, according to receiving end electric network fault situation, to output
The voltage compensation quantity of voltage control unit 501 and output current control unit 502 coordinates and optimizes；
3-2. coordinates control unit 16, and to default ac bus voltage setting valve and measured value compares and computing, respectively
Generate output voltage control unit 501 output voltage instruction signal and output current control unit 502 output electric current without
Merit component instruction, enters step 5；
I.e. according to receiving end electrical network 3 operation conditions and the output signal of fault distinguishing unit 15, to described series-multiple connection combined compensation
Device 5 is connected and is exported current control unit 502 and coordinates and optimal control, the output voltage control unit needed for generation
501 output voltage instruction Δ U*Reactive component of current instruction is exported with output current control unit 502
Wherein, when receiving end electrical network 3 breaks down, the output voltage control unit 501 of described series-multiple connection combined compensation device 5
With compensation network Voltage Drop as target, according to the fault state of receiving end electrical network 3, to series connection and output current control unit
502 voltage compensation quantities provided coordinate and optimize, and carry out default ac bus voltage setting valve and measured value
Comparison and computing, generate output voltage control unit 501 output voltage instruction signal and and output current control unit respectively
502 output reactive component of current instructions；
When receiving end electrical network is properly functioning, the output voltage control unit 501 of described series-multiple connection combined compensation device is to compensate nothing
Merit is target, and output voltage control unit 501 is for compensation network line impedance, it is achieved series connection reactive-load compensation, output electricity
Flow control unit 502 is according to DC transmission system reactive requirement, it is achieved parallel reactive compensates, and generates output voltage control respectively
Unit 501 output voltage instruction signal processed and and output current control unit 502 export the reactive component of current instruction.
As shown in figure 11, step 4 includes:
4-1. coordination control unit 16 is with compensating reactive power as target, and output voltage control unit 501 compensation network circuit hinders
Anti-, it is achieved series connection reactive-load compensation, output current control unit 502 is according to HVDC System Reactive Power demand, it is achieved in parallel
Reactive-load compensation；
4-2. output voltage control unit 501 and output current control unit 502 generates respectively output voltage instruction signal with
The reactive component of current instructs, and enters step 5；
I.e. instruct Δ U according to the output voltage of output voltage control unit 501*With output current control unit 502 defeated
Go out reactive component of current instructionDistinctly realize output voltage control unit 501 output voltage control, output electric current controls
Unit 502 exports electric current control, submodule electric capacity C voltage controls and power switch pipe triggers and controls.
The present invention provides first series-multiple connection combination utilizing series-multiple connection combined compensation device suppression HVDC commutation failure to mend
The concrete application examples of compensation method:
The output current control unit 502 of described series-multiple connection combined compensation device 5 is connected in parallel on receiving end by some transformers 8
On electrical network 3 bus, as it is shown in figure 1, and wherein said friendship-alternating current source converter 6 use " back-to-back " module shown in Fig. 3
Change multi-level converter (MMC) circuit.
The present invention provides second series-multiple connection combination utilizing series-multiple connection combined compensation device suppression HVDC commutation failure to mend
The concrete application examples of compensation method:
The output current control unit 502 of described series-multiple connection combined compensation device 5 is connected in parallel on inversion by some transformers 8
On the ac bus 2 of side 1, as in figure 2 it is shown, and wherein said friendship-alternating current source converter 6 use " back-to-back " shown in Fig. 3
Modular multilevel converter (MMC) circuit.
The present invention provides the 3rd the series-multiple connection combination utilizing series-multiple connection combined compensation device suppression HVDC commutation failure to mend
The concrete application examples of compensation method:
The output current control unit 502 of described series-multiple connection combined compensation device 5 is connected in parallel on receiving end by some transformers 8
On electrical network 3 bus, as it is shown in figure 1, and wherein said friendship-alternating current source converter 6 use the modularity shown in Fig. 4 how electric
Flat matrix converter M3C circuit.
The present invention provides the 4th the series-multiple connection combination utilizing series-multiple connection combined compensation device suppression HVDC commutation failure to mend
The concrete application examples of compensation method:
The output current control unit 502 of described series-multiple connection combined compensation device 5 is connected in parallel on inversion by some transformers 8
On the ac bus 2 of side 1, as in figure 2 it is shown, and wherein said friendship-alternating current source converter 6 use the modularity shown in Fig. 3
Multilevel matrix converter M3C circuit.
Above example is only in order to illustrate that technical scheme is not intended to limit, although with reference to above-described embodiment to this
Invention has been described in detail, and the detailed description of the invention of the present invention still can be entered by those of ordinary skill in the field
Row amendment or equivalent, and these are without departing from any amendment of spirit and scope of the invention or equivalent, it is equal
Within the claims of the present invention that application is awaited the reply.
Claims (10)
1. the series-multiple connection combined compensation device suppressing HVDC commutation failure, it is characterised in that described series-multiple connection group
Close compensator to be arranged between HVDC system inverter side ac bus and receiving end electrical network, and described series-multiple connection combined compensation
Device includes crosspoint, interconnective output voltage control unit and output current control unit；
Described output voltage control unit is connected between described inverter side ac bus and receiving end electrical network；
Described output current control unit is connected in parallel on described inverter side ac bus or on the bus of receiving end electrical network；
Described output voltage control unit and output current control unit are connected to described crosspoint.
2. series-multiple connection combined compensation device as claimed in claim 1, it is characterised in that described crosspoint includes handing over-
Alternating current source converter and be connected to the controller of described friendship-alternating current source converter, described output voltage control unit is one
Series side transformator, described output current control unit is a side transformer in parallel；
Described friendship-alternating current source converter is provided with three-phase input end and three-phase output end；
Described series side transformator is connected with the three-phase input end of described friendship-alternating current source converter；
Described side transformer in parallel is connected with the three-phase output end of described friendship-alternating current source converter.
3. series-multiple connection combined compensation device as claimed in claim 2, it is characterised in that described friendship-alternating current source converter
Including using dc bus and the side in parallel Modular multilevel converter of connection and series side Modular multilevel converter；
Described side Modular multilevel converter in parallel and series side Modular multilevel converter be three-phase bridge structure and
All include brachium pontis and lower brachium pontis on three-phase；
Described upper brachium pontis and lower brachium pontis all include that half-bridge submodule string and reactor, described half-bridge submodule string include multiple depending on
The half-bridge submodule of secondary series connection；
The reactor of described upper brachium pontis is connected on the end of the half-bridge submodule string of described upper brachium pontis, the reactance of described lower brachium pontis
Device is connected on the head end of the half-bridge submodule string of described lower brachium pontis；
The reactor of described upper brachium pontis be connected with the reactor of described lower brachium pontis and each junction point to be respectively described modularity many
The input of each phase of level converter AC；
The head end of the half-bridge submodule string of described upper brachium pontis is all connected with positive direct-current bus；
The end of the half-bridge submodule string of described lower brachium pontis is all connected with negative dc bus.
4. series-multiple connection combined compensation device as claimed in claim 3, it is characterised in that described half-bridge submodule includes string
Two power switch pipes of connection and capacitor, and described capacitor and two described power switch pipe place branch circuit parallel connections；
It is provided with anti-paralleled diode in described power switch pipe；
The two ends of one of them described power switch pipe are respectively two outfans of described half-bridge submodule.
5. series-multiple connection combined compensation device as claimed in claim 2, it is characterised in that described friendship-alternating current source converter
For modular multilevel matrix converter, and the internal structure of described modular multilevel matrix converter is 3x3 matrix knot
Structure；
Being provided with nine power train in described modular multilevel matrix converter, described power train includes the reactance being sequentially connected in series
Device and multiple H bridge submodule, and the two ends of described power train are respectively the first outfan and the second outfan；
First outfan of each described power train is all with the input of the described each phase of modular multilevel matrix converter even
Connect, and the second outfan of each described power train is all with the outfan of the described each phase of modular multilevel matrix converter even
Connect.
6. series-multiple connection combined compensation device as claimed in claim 5, it is characterised in that described H bridge submodule includes electricity
Container and two power switch pipe branch roads, and two power switch pipes are all in parallel with described capacitor；Article one, described power
The first power switch pipe and the second power switch pipe it is in series with, on another described power switch pipe branch road on switching tube branch road
It is in series with the 3rd power switch pipe and the 4th power switch pipe；
The emitter stage of described first power switch pipe is respectively connecting to the colelctor electrode of described second power switch pipe and described H
First outfan of bridge submodule, and the positive pole of the colelctor electrode described capacitor of connection of described first power switch pipe；Described
The emitter stage of the second power switch pipe connects the negative pole of described capacitor；
The emitter stage of described 3rd power switch pipe is respectively connecting to the colelctor electrode of described 4th power switch pipe and described H
Second outfan of bridge submodule, and the positive pole of the colelctor electrode described capacitor of connection of described 3rd power switch pipe, described
The emitter stage of the 4th power switch pipe connects the negative pole of described capacitor.
7. the series-multiple connection combined compensation device as described in any one of claim 2 to 6, it is characterised in that described controller
Including the voltage detection unit being in communication with each other, fault distinguishing unit, coordinate control unit and internal ring regulation and control unit；
Described voltage detection unit, for described HVDC system inverter side ac bus voltage and receiving end line voltage
Detect, obtain described receiving end mains voltage signal；
Described fault distinguishing unit, is used for analyzing described receiving end mains voltage signal, and judges whether described receiving end electrical network is sent out
Raw fault；
Described coordination control unit, for the operation conditions according to described receiving end electrical network, to described series-multiple connection combined compensation
Described output current control unit and the output current control unit of device coordinate and optimal control, generate described output electricity
The output voltage instruction of pressure control unit and the output reactive component of current instruction of described output current control unit；
Described internal ring regulation and control unit, for according to the instruction of described output voltage and output reactive component of current instruction, the most real
The existing output voltage control of described output voltage control unit, the output electric current of described output current control unit control, son
Module capacitance Control of Voltage and power switch pipe trigger and control.
8. the method suppressing HVDC commutation failure, it is characterised in that described method is with being arranged on HVDC system
Series-multiple connection combined compensation device between system inverter side ac bus and receiving end electrical network realizes, described series-multiple connection combined compensation device
Including crosspoint, interconnective output voltage control unit and output current control unit；Described output voltage control
Unit is connected between described inverter side ac bus and receiving end electrical network；Described output current control unit is connected in parallel on described inverse
Become on the ac bus of side or on the bus of receiving end electrical network；Described output voltage control unit and output current control unit all connect
It is connected to described crosspoint；Described crosspoint includes friendship-alternating current source converter and is connected to described friendship-alternating current source converter
Controller；Voltage detection unit, fault distinguishing unit that described controller includes being in communication with each other, coordinate control unit and
Internal ring regulation and control unit；
Described method comprises the steps:
Voltage detection unit described in step 1. detects inverter side ac bus voltage and receiving end electrical network in described HVDC system
Voltage signal；
Inverter side ac bus voltage described in fault distinguishing element analysis described in step 2. and receiving end mains voltage signal, sentence
Whether disconnected described receiving end electrical network breaks down；
The most then enter step 3；
If it is not, then enter step 4；
Described in step 3., coordination control unit is with compensation network Voltage Drop as target, according to described receiving end operation of power networks shape
Condition and the output signal of described fault distinguishing unit, carried out described output voltage control unit and output current control unit
Coordinate and optimal control；Generate control instruction, enter step 5；
Described in step 4., coordination control unit is with compensating reactive power as target, controls described output voltage control unit and output
Current control unit realizes connect reactive-load compensation and parallel reactive compensation respectively；Generate control instruction, enter step 5；
Described in step 5., internal ring regulation and control unit is according to described control instruction, realizes the output of described voltage control unit respectively
Control of Voltage, the output electric current of described output current control unit control, submodule capacitor voltage controls and power switch
Pipe triggers and controls.
9. method as claimed in claim 8, it is characterised in that described step 3 includes:
Described in 3-1., coordination control unit is with compensation network Voltage Drop as target, according to described receiving end electric network fault situation,
The voltage compensation quantity of described output voltage control unit and output current control unit is coordinated and optimizes；
To default ac bus voltage setting valve and measured value compares and computing to coordinate control unit described in 3-2., point
Do not generate the output voltage instruction signal of described output voltage control unit and the output electricity of described output current control unit
Stream idle component instruction, enters step 5.
10. method as claimed in claim 8 or 9, it is characterised in that described step 4 includes:
Described in 4-1., coordination control unit is with compensating reactive power as target, described output voltage control unit compensation grid line roadlock
Anti-, it is achieved series connection reactive-load compensation, described output current control unit is according to HVDC System Reactive Power demand, it is achieved in parallel
Reactive-load compensation；
Output voltage control unit described in 4-2. and output current control unit generate output voltage instruction signal and electricity respectively
Stream idle component instruction, enters step 5.
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| CN111564864A (en) * | 2020-05-21 | 2020-08-21 | 北方工业大学 | Half-wavelength alternating current transmission system, tuning method thereof and flexible grid connection method |
| CN114944664A (en) * | 2022-04-14 | 2022-08-26 | 中国矿业大学 | HVDC power control strategy adjustment system and method considering UPFC operation |
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