CN206211546U - Bipolar flexible direct current transmission system and its current conversion station - Google Patents

Bipolar flexible direct current transmission system and its current conversion station Download PDF

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Publication number
CN206211546U
CN206211546U CN201621241456.8U CN201621241456U CN206211546U CN 206211546 U CN206211546 U CN 206211546U CN 201621241456 U CN201621241456 U CN 201621241456U CN 206211546 U CN206211546 U CN 206211546U
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China
Prior art keywords
current
conversion station
transverter
current conversion
reactor
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CN201621241456.8U
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Inventor
徐迪臻
黄莹
赵晓斌
周诗嘉
卢毓欣
张祖安
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Research Institute of Southern Power Grid Co Ltd
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Power Grid Technology Research Center of China Southern Power Grid Co Ltd
Research Institute of Southern Power Grid Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

The utility model provides a kind of bipolar flexible direct current transmission system and its current conversion station, is related to technical field of electric power, can suppress the short circuit current produced when bipolar flexible direct current transmission system DC side breaks down.Current conversion station for bipolar flexible direct current transmission system includes positive polarity change of current part and negative polarity change of current part;The positive polarity change of current part includes the first transverter;The negative polarity change of current part includes the second transverter;The current conversion station also includes current limliting module;The current limliting module includes reactor, and the reactor is connected on neutral bus.

Description

Bipolar flexible direct current transmission system and its current conversion station
Technical field
The utility model is related to technical field of electric power, more particularly to a kind of bipolar flexible direct current transmission system and its change of current Stand.
Background technology
Technology of HVDC based Voltage Source Converter is a kind of VSC-HVDC technology, and rational control & protection strategy determines flexible straight Stream transmission system safe and stable operation.Its flexible Application performance makes it in urban distribution network interconnection, clean energy resource is grid-connected and orphan The island field such as power has broad application prospects.
In order to realize the requirement of high-capacity power conveying, it is necessary to increase submodule quantity to improve its voltage class, but mistake Multi-tool block is cascaded, and valve control equipment is controlled difficulty increase, therefore uses dipolar configuration form, is reducing single convertor unit While module-cascade number, same transimission power is reached as a kind of feasible selection.
Dc-side short-circuit fault is one of subject matter that current bipolar flexible HVDC Transmission Technology is faced.When bipolar soft Property DC transmission system DC side when breaking down, due to its special topological structure, very big short circuit current will be produced.Should Short circuit current flows through transverter so that the current stress increase of transverter, or even causes the damage of transverter, while also serious prestige The safety of relevant device in faulty line is coerced.
The content of the invention
Embodiment of the present utility model provides a kind of bipolar flexible direct current transmission system and its current conversion station, can suppress bipolar soft The short circuit current that property DC transmission system DC side produces when breaking down.
To reach above-mentioned purpose, embodiment of the present utility model is adopted the following technical scheme that:
On the one hand, there is provided a kind of current conversion station for bipolar flexible direct current transmission system, including positive polarity change of current part and Negative polarity change of current part;The positive polarity change of current part includes the first transverter;The negative polarity change of current part is changed including second Stream device;The current conversion station also includes current limliting module;The current limliting module includes reactor, and the reactor is connected on neutral bus On.
Preferably, the current limliting module also includes an arrester;One end of the arrester connects with the neutral bus Connect, other end ground connection;Wherein, the arrester is arranged between the low-voltage end of transverter and the reactor.
Preferably, the current limliting module includes two arresters;One end of one of them arrester and described first The low-pressure end connection of transverter, other end ground connection;The low-pressure end of one end of another arrester and second transverter Connection, other end ground connection.
Preferably, the reactor includes at least one sub- reactor;Wherein, when the reactor includes many sub- reactance During device, many sub- reactors are set in series and/or parallel.
Based on above-mentioned preferred, first transverter and second transverter include multiple valve modules;Each valve Component includes insulated gate bipolar transistor converter valve.
, there is provided a kind of bipolar flexible direct current transmission system, including sending end current conversion station and receiving end current conversion station on the other hand; The sending end current conversion station and/or the receiving end current conversion station are above-mentioned current conversion station.
It is further preferred that the sending end current conversion station and the receiving end current conversion station are the current conversion station;It is described to send Electric end current conversion station turns DC converter station for exchange;The receiving end current conversion station delivers stream current conversion station for direct current.
It is further preferred that the exchange end of the first transverter and the second transverter is connected with converter power transformer;The power transmission First transverter high-pressure side of positive polarity change of current part and positive polarity change of current part in the receiving end current conversion station in the current conversion station of end The first transverter high-pressure side, the sending end current conversion station in negative polarity change of current part the second transverter high-pressure side and institute The the second transverter high-pressure side for stating negative polarity change of current part in receiving end current conversion station passes through bipolarity high-voltage dc transmission electric wire Connection.
The utility model provides a kind of bipolar flexible direct current transmission system and its current conversion station, and reactor is included by setting Current limliting module, when the DC side of the current conversion station breaks down to be short-circuited, the electric current for flowing through reactor increases suddenly, and root According to the characteristic of reactor, it can produce reverse current to limit the electric current of unexpected increase, thus can suppress the current conversion station direct current The short circuit current of side, it is ensured that the security of the relevant device on transverter and circuit in current conversion station.On this basis, only Reduce the short circuit current of positive polarity change of current part and negative polarity change of current Partial DC side simultaneously by a current limliting module, reduce The cost of the current conversion station.
Brief description of the drawings
In order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art, below will be to embodiment Or the accompanying drawing to be used needed for description of the prior art is briefly described, it should be apparent that, drawings in the following description are only It is some embodiments of the present utility model, for those of ordinary skill in the art, is not paying the premise of creative work Under, other accompanying drawings can also be obtained according to these accompanying drawings.
A kind of topology of current conversion station for bipolar flexible direct current transmission system that Fig. 1 is provided for the utility model embodiment Schematic diagram;
Current limliting in a kind of current conversion station for bipolar flexible direct current transmission system that Fig. 2 is provided for the utility model embodiment The topological schematic diagram one of module;
Current limliting in a kind of current conversion station for bipolar flexible direct current transmission system that Fig. 3 is provided for the utility model embodiment The topological schematic diagram two of module;
Current limliting in a kind of current conversion station for bipolar flexible direct current transmission system that Fig. 4 is provided for the utility model embodiment The topological schematic diagram three of module;
Current limliting in a kind of current conversion station for bipolar flexible direct current transmission system that Fig. 5 is provided for the utility model embodiment The topological schematic diagram four of module;
Current limliting in a kind of current conversion station for bipolar flexible direct current transmission system that Fig. 6 is provided for the utility model embodiment The topological schematic diagram five of module;
A kind of topological schematic diagram of bipolar flexible direct current transmission system that Fig. 7 is provided for the utility model embodiment.
Brief description of the drawings:
01- sending end current conversion stations;02- receiving end current conversion stations;100- positive polarity changes of current part;The transverters of 110- first; 111- the first transverter low-pressure ends;112- the first transverter high-pressure sides;200- negative polarity changes of current part;The transverters of 210- second; 211- the second transverter low-pressure ends;212- the second transverter high-pressure sides;300- current limliting modules;310- reactors;The sub- reactance of 311- Device;320- arresters;400- neutral buses;500- commutating reactors;600- converter power transformers.
Specific embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made The every other embodiment for being obtained, belongs to the scope of the utility model protection.
The utility model embodiment provides a kind of current conversion station for bipolar flexible direct current transmission system, including positive polarity is changed Stream part 100 and negative polarity change of current part 200;Positive polarity change of current part 100 includes the first transverter 110;Negative polarity change of current portion Dividing 200 includes the second transverter 210;The current conversion station also includes current limliting module 300;Current limliting module 300 includes reactor 310, Reactor 310 is connected on neutral bus 400.
Wherein, current limliting module 300 is used for when positive polarity change of current part 100 or the appearance of the DC side of negative polarity change of current part 200 Failure, when causing the current conversion station dc-side short-circuit, reduces short circuit current.
It should be noted that the first, the first transverter 110 and the second transverter 210 can be used to be converted to alternating current directly Stream electricity, it can also be used to which direct current is converted into alternating current.
No matter the first transverter 110 and the second transverter 210 are used to for alternating current to be converted to direct current, or by direct current Alternating current is converted to, the first transverter high-pressure side 112 and the second transverter high-pressure side 212 are all that connection positive high voltage direct current is defeated respectively Electric wire and negative high voltage DC transmission line.
Second, the specific structure of the first transverter 110 and the inside of the second transverter 210 is not defined, as long as according to Need, alternating current can be converted to direct current, or direct current is converted into alternating current.
3rd, the specific current conversion station that the design parameter of reactor 310 can be applied according to it is set, as long as ensureing During generation dc-side short-circuit, the device in current conversion station is not destroyed.
The utility model embodiment provides a kind of current conversion station, and the current limliting module 300 of reactor 310 is included by setting, when The DC side of the current conversion station breaks down when being short-circuited, and the electric current for flowing through reactor 310 increases suddenly, and according to reactor 310 characteristic, it can produce reverse current to limit the electric current of unexpected increase, thus can suppress the short of the current conversion station DC side Road electric current, it is ensured that the security of the relevant device on transverter and circuit in current conversion station.On this basis, only by one Individual current limliting module 300 reduces the short circuit current of positive polarity change of current part 100 and the DC side of negative polarity change of current part 200, drop simultaneously The low cost of the current conversion station.
In view of when there is short trouble in the DC side of positive polarity change of current part 100, the first transverter high-pressure side 112 with First transverter low-pressure end 111 is connected, and causes the voltage spikes of the first transverter low-pressure end 111;Or, when negative polarity change of current portion When dividing 200 DC side short trouble occur, the second transverter high-pressure side 212 is connected with the second transverter low-pressure end 211, is caused The voltage spikes of the second transverter low-pressure end 211.In the case, in order to avoid the device in the current conversion station is destroyed, need Want the insulation against ground level of the first transverter of current conversion station low-pressure end 111 and the second transverter low-pressure end 211 higher, so as to lead Cause the raising of the first transverter 110 and the cost of the second transverter 210.Based on this, it is preferred that as shown in Fig. 2 current limliting module 300 Also include an arrester 320;One end of arrester 320 is connected with neutral bus 400, other end ground connection;Wherein, arrester 320 are arranged between the low-voltage end of transverter and reactor 310.
It should be noted that it will be recognized by those skilled in the art that arrester 320 can reduce the voltage and electricity in circuit Stream, protects electric equipment from the harm of transient overvoltage high.
In the utility model embodiment, also include arrester 320 by making current limliting module 300, in the straight of the current conversion station Stream side is short-circuited failure, and when the voltage of the first transverter low-pressure end 111 or the voltage of the second transverter low-pressure end 211 rise to During the protection voltage level of arrester 320, arrester 320 works, and the portion of electrical current in short-circuit loop is flowed by arrester 320 Enter the earth, so as to reduce the current stress of reactor 310, it is also possible to improve the first transverter low-pressure end 111 and second change of current The insulation against ground level of device low-pressure end 211, and then can reduce to the first transverter low-pressure end 111 and the second transverter low-pressure end The requirement of 211 insulation against ground level.
Or, it is preferred that as shown in figure 3, the current limliting module 300 includes two arresters 320;One of arrester 320 one end is connected with the first transverter low-pressure end 111, other end ground connection;One end of another arrester 320 and second change of current Device low-pressure end 211 is connected, other end ground connection.
The utility model embodiment is respectively in the first transverter low-pressure end 111 and the connection of the second transverter low-pressure end 211 one Individual arrester 320, can preferably reduce the insulation against ground of the first transverter low-pressure end 111 and the second transverter low-pressure end 211 The current stress of level and reactor 310.
Relative dc circuit breaker and its relevant device using bigger connecting-disconnecting function, due to high-tension electricity, the direct current of Large Copacity , still in the development stage, in cannot temporarily directly applying to engineering, and its cost of manufacture is high for breaker, thus limit its Practical application in DC engineering;Or, it is relative to use traditional restrictor apparatus, but traditional restrictor apparatus are occurring Open-circuit line is needed after failure, trend distribution and the stability of system is influenceed;Or it is relative using fast based on current-carrying isolator Fast fault current limiter, does not need open-circuit line after breaking down, failure terminates rear electric current can be continued to circulate from by-pass switch, Trend under not influenceing system normally to run is distributed, but its equipment is complicated, and manufacturing cost is higher.The utility model embodiment by Reactor 310 and arrester 320 are included up in current limliting module 300 so that the topology of the current conversion station is free of high-power electric Electronic device, cost relative moderate, small volume realizes simple and excellent performance, thus is easy to practical application popularization.
Because metal oxide arrester (Metal Oxide Arrester, MOA) has, action response is fast, it is multiple to be resistant to The advantages of lightning surge or switching overvoltage, energy absorption capability are big, resistance to pollution performance is good, it is preferred, therefore, that arrester 320 is metal oxide arrester.
Preferably, reactor 310 includes at least one sub- reactor 311;Wherein, when reactor 310 includes many height electricity During anti-device 311, how sub- reactor 311 is set in series and/or parallel.
So that reactor 310 includes two sub- reactors 311 as an example, as shown in figure 4, two sub- reactance in reactor 310 Device 311 is connected in series.Or, as shown in figure 5, two sub- reactors 311 in reactor 310 are connected in parallel.
So that reactor 310 includes three sub- reactors 311 as an example, as shown in fig. 6, two of which electricity in reactor 310 Anti- device 311 is connected in parallel, and is connected in series with another sub- reactor 311.
It should be noted that many sub- reactors 311 are set with a variety of feelings by the way of string and/or parallel connection Condition, Fig. 4-6 is that sets forth a kind of situation in three kinds of set-up modes.
The utility model embodiment using many sub- reactors 311 go here and there and/or parallel combination by the way of limiting short-circuit current, Every parameter of sub- reactor 311 can be reduced, so that can reduces cost.
It is out in view of insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) It is logical, turn off controllable wholly-controled device, control of the IGBT converter valves to transmission system is more flexible, can control reactive power and Make current conversion station without huge reactive power compensator, and the switching frequency of IGBT converter valves is of a relatively high, makes the defeated of current conversion station Go out that voltage harmonic amount is smaller, so that the capacity of the filter installed using the current conversion station of IGBT converter valves is greatly reduced.Base In this, it is preferred that the first transverter 110 and the second transverter 210 include multiple valve modules;Each valve module includes insulation Grid bipolar transistor converter valve.
The utility model embodiment also provides a kind of bipolar flexible direct current transmission system, as shown in fig. 7, comprises sending end is changed Stream station 01 and receiving end current conversion station 02;Sending end current conversion station 01 and/or receiving end current conversion station 02 changing for foregoing any embodiment Stream station.
It should be noted that Fig. 7 is foregoing any embodiment with sending end current conversion station 01 and receiving end current conversion station 02 Current conversion station is illustrated.
The utility model embodiment includes reactor 310 by being set in the current conversion station of bipolar flexible direct current transmission system Current limliting module 300, when the current conversion station DC side break down be short-circuited when, the electric current for flowing through reactor 310 is unexpected Increase, and according to the characteristic of reactor 310, it can produce reverse current to limit the electric current of unexpected increase, thus institute can be suppressed State the short circuit current of current conversion station DC side, it is ensured that the security of the relevant device on transverter and circuit in current conversion station. On this basis, positive polarity change of current part 100 and negative polarity change of current part 200 are only reduced by a current limliting module 300 simultaneously The short circuit current of DC side, reduces the cost of the current conversion station.
It is further preferred that as shown in fig. 7, sending end current conversion station 01 and receiving end current conversion station 02 are the utility model reality Apply the current conversion station of the foregoing any embodiment of example;Sending end current conversion station 01 turns DC converter station for exchange;Receiving end current conversion station 02 is Direct current delivers stream current conversion station.
Wherein, when the current conversion station is sending end current conversion station 01, the first transverter 110 and the second transverter 210 are used for Alternating current is changed into the direct current that multi-line power transmission ability is strong, loss is small;When the current conversion station is sending end current conversion station 01, first The DC conversion that the transverter 210 of transverter 110 and second is used to receiving be can large area transmission of electricity alternating current.
The utility model embodiment makes the sending end current conversion station 01 and receiving end current conversion station of the bipolar flexible transmission system 02 includes current limliting module 300, it is ensured that when the DC side of the bipolar flexible transmission system breaks down to be short-circuited, Short circuit current in the circuit of sending end current conversion station 01 and receiving end current conversion station 02 is suppressed, so that the first device in protection circuit Part is not destroyed.
It is further preferred that as shown in fig. 7, the exchange end of the first transverter 110 and the second transverter 210 and change of current transformation Device 600 is connected;First transverter high-pressure side 112 of positive polarity change of current part 100 and the receiving end change of current in sending end current conversion station 01 Stand in 02 negative polarity change of current part in first transverter high-pressure side 112, the sending end current conversion station 01 of positive polarity change of current part 100 200 the second transverter high-pressure side 212 and the second transverter high-pressure side of negative polarity change of current part 200 in receiving end current conversion station 02 212 are connected by bipolarity high-voltage dc transmission electric wire.
Wherein, the bipolar flexible direct current transmission system also includes commutating reactor 500, converter power transformer 600, Yi Jijiao Streaming system.
Commutating reactor 500 is connected with the exchange end of the first transverter 110, the second transverter 210, is used to reduce electric power half To the influence of AC system waveform during conductor device commutation, and limiting AC side short circuit current.
Converter power transformer 600 is connected by commutating reactor 500 with the end that exchanges of the first transverter 110, the second transverter 210 Connect.
It should be noted that the exchange end of the first transverter 110 and the second transverter 210 is connected with converter power transformer 600, I.e. the exchange end of the first transverter 110 of sending end current conversion station 01 and receiving end current conversion station 02 and the second transverter 210 with change Convertor transformer 600 is connected.
The utility model embodiment is by by the exchange end of the first transverter 110 and the second transverter 210 and change of current transformation Device 600 is connected, on the one hand, be capable of achieving the connection between AC network and direct current network;On the other hand, it is possible to achieve the change of voltage Change, the AC voltage of the DC voltage of sending end current conversion station 01 or receiving end current conversion station 02 is met its rated voltage and is allowed Variation.On this basis, sending end current conversion station 01 and receiving end current conversion station are connected by bipolarity high-voltage dc transmission electric wire 02, line transmission ability can be improved, reduce the power consumption during line transmission.
The above, specific embodiment only of the present utility model, but protection domain of the present utility model do not limit to In this, any one skilled in the art can readily occur in change in the technical scope that the utility model is disclosed Or replace, should all cover within protection domain of the present utility model.Therefore, protection domain of the present utility model should be with the power The protection domain that profit is required is defined.

Claims (8)

1. a kind of current conversion station for bipolar flexible direct current transmission system, it is characterised in that including positive polarity change of current part and negative Polarity change of current part;The positive polarity change of current part includes the first transverter;The negative polarity change of current part includes second change of current Device;
The current conversion station also includes current limliting module;The current limliting module includes reactor, and the reactor is connected on neutral bus On.
2. current conversion station according to claim 1, it is characterised in that the current limliting module also includes an arrester;It is described One end of arrester is connected with the neutral bus, other end ground connection;Wherein, the arrester is arranged on the low-pressure end of transverter Between the reactor.
3. current conversion station according to claim 1, it is characterised in that the current limliting module includes two arresters;Wherein one One end of the individual arrester is connected with the low-pressure end of first transverter, other end ground connection;Another arrester One end is connected with the low-pressure end of second transverter, other end ground connection.
4. current conversion station according to claim 1, it is characterised in that the reactor includes at least one sub- reactor;Its In, when the reactor includes many sub- reactors, many sub- reactors are set in series and/or parallel.
5. the current conversion station according to claim any one of 1-4, it is characterised in that first transverter and described second is changed Stream device includes multiple valve modules;
Each valve module includes insulated gate bipolar transistor converter valve.
6. a kind of bipolar flexible direct current transmission system, it is characterised in that including sending end current conversion station and receiving end current conversion station;
The sending end current conversion station and/or the receiving end current conversion station are the current conversion station described in claim any one of 1-5.
7. transmission system according to claim 6, it is characterised in that the sending end current conversion station and the receiving end change of current Station is the current conversion station;
The sending end current conversion station turns DC converter station for exchange;The receiving end current conversion station delivers stream current conversion station for direct current.
8. transmission system according to claim 7, it is characterised in that the exchange end of the first transverter and the second transverter with Converter power transformer is connected;
In the sending end current conversion station in the first transverter high-pressure side of positive polarity change of current part and the receiving end current conversion station just Second change of current of negative polarity change of current part in the first transverter high-pressure side, the sending end current conversion station of polarity change of current part Device high-pressure side is high by bipolarity with the second transverter high-pressure side of negative polarity change of current part in the receiving end current conversion station Pressure DC transmission line connection.
CN201621241456.8U 2016-11-17 2016-11-17 Bipolar flexible direct current transmission system and its current conversion station Active CN206211546U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106410837A (en) * 2016-11-17 2017-02-15 南方电网科学研究院有限责任公司 Bipolar flexible direct-current power transmission system and converter station thereof
CN108832607A (en) * 2018-06-20 2018-11-16 国家电网公司 A kind of symmetrical bipolar flexible direct current engineering converter station Insulation Coordination method and system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106410837A (en) * 2016-11-17 2017-02-15 南方电网科学研究院有限责任公司 Bipolar flexible direct-current power transmission system and converter station thereof
CN108832607A (en) * 2018-06-20 2018-11-16 国家电网公司 A kind of symmetrical bipolar flexible direct current engineering converter station Insulation Coordination method and system
CN108832607B (en) * 2018-06-20 2019-12-13 国家电网公司 Insulation matching method and system for symmetrical bipolar flexible direct current engineering converter station

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