CN109755954A - A kind of Hybrid HVDC system converter fault guard method and device - Google Patents
A kind of Hybrid HVDC system converter fault guard method and device Download PDFInfo
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- CN109755954A CN109755954A CN201910229841.2A CN201910229841A CN109755954A CN 109755954 A CN109755954 A CN 109755954A CN 201910229841 A CN201910229841 A CN 201910229841A CN 109755954 A CN109755954 A CN 109755954A
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The present invention discloses a kind of Hybrid HVDC system converter fault guard method and device, comprising acquisition link and judges processing links；Acquisition link is for acquiring the DC current for flowing through voltage source converter unit, bridge arm current, the DC voltage at voltage source converter unit both ends, submodule capacitor voltage；Judge processing links for according to acquisition link acquisition each analog quantity come extract calculating bridge arm reactor short trouble feature and judge whether bridge arm reactor occurs short trouble, if confirming, short trouble occurs for bridge arm reactor, alarm is then issued, and the alternating current inlet wire breaker that blocking voltage source type inverter and trip voltage source type inverter are connected after certain time-delay.The present invention can effectively solve the problem that the identification problem of voltage source converter bridge arm reactance short trouble, and the safety of the equipment such as voltage source converter and bridge arm reactance is effectively protected.
Description
Technical field
The invention belongs to direct current transportation field, in particular to a kind of Hybrid HVDC system converter fault guard method
And device.
Background technique
HVDC transmission system can be divided into two types: the customary DC transmission system (LCC- based on thyristor technology
) and the flexible HVDC transmission system based on all-controlling power electronics device technology (Flexible-HVDC) HVDC.Wherein, conventional
DC transmission system (LCC-HVDC) is at low cost, loss is small, running technology is mature, currently, the direct current being currently running in the world is defeated
Electric system is nearly all LCC-HVDC system, but there are inverter sides to be easy to happen commutation for customary DC transmission system (LCC-HVDC)
The disadvantages of failure, a large amount of idle, converter stations of absorption strong to the dependence of AC system take up a large area.And the flexibility of a new generation
DC transmission system (Flexible-HVDC) then can be realized active power and reactive power decoupling control, can be to passive net
Network power supply, compact-sized occupied area it is small, be not present inverter side commutation failure problem the advantages that, but its there are it is with high costs, damage
Consume the defects of larger.
In order to meet the requirement of long-distance and large-capacity power transmission, customary DC transmission system generally uses two or more changes of current
The concatenated technology of device carrys out the DC voltage level and transmission capacity of lifting system.Same, the country is implementing mixed at present
Closing DC transmission engineering uses rectification side to connect for two thyristor transverters, and inverter side is two voltage source converter series connection
Or multiple voltage source converters it is in parallel after with a concatenated topological structure of thyristor transverter.
Currently, the bridge arm reactor of voltage source converter is normally at exchange tie point in flexible HVDC transmission system
Between bridge arm converter valve, as shown in Figure 1, however this arrangement occur simultaneously in the wall bushing of two-phase bridge arm reactor
Failure F31BC, the bridge arm converter valve of this two-phase will form the direct short-circuit event without bridge arm reactor as shown in figure 1 when breakdown fault
Barrier, forms very big fault current, badly damaged converter valve.Although the probability that this failure occurs is very small, once send out
It is raw to will result directly in converter valve damage.This arragement construction is not avoided that such failure, in order to solve this problem, considers bridge
The position of arm reactor is adjusted public to direct-flow positive pole is located at by original being located between exchange tie point and bridge arm converter valve
Between concurrent or cathode common point and bridge arm converter valve, as shown in Figure 2.In this way when the wall bushing of two-phase bridge arm reactor simultaneously
Occur breakdown fault when such as Fig. 2 in failure F33BC, only short trouble has occurred in two-phase bridge arm reactor, to the shadow of converter valve
Sound will substantially reduce, although this failure is smaller on the influence of the normal operation of system, if cannot find and solve for a long time
Certainly, finally the equipment belts such as converter valve and bridge arm reactor can also be endangered.Therefore, the present invention provides a kind of Hybrid HVDC
The guard method of system converter fault and device can effectively solve the problem that the identification of voltage source converter bridge arm reactance short trouble
The safety of the equipment such as voltage source converter and bridge arm reactance is effectively protected in problem.
Summary of the invention
The object of the present invention is to provide a kind of Hybrid HVDC system converter fault guard method and devices, can
The identification for effectively solving the problems, such as voltage source converter bridge arm reactance short trouble, is effectively protected voltage source converter and bridge
The safety of the equipment such as arm reactance.
In order to achieve the above objectives, the present invention adopts the following technical scheme:
A kind of Hybrid HVDC system converter fault guard method, the method is to contain there is at least one set of voltage
The bridge arm reactor of the DC transmission system of source type inverter unit, each bridge arm of the voltage source converter unit is located at
Between direct-flow positive pole common point or cathode common point and the converter valve of each bridge arm, the fault protecting method includes acquisition link
With judge processing links；
The acquisition link, for acquiring the DC current for flowing through voltage source converter unit, bridge arm current, voltage source
The DC voltage at type inverter unit both ends, submodule capacitor voltage；
The judgement processing links, for calculating bridge arm reactor according to each analog quantity of acquisition link acquisition to extract
Short trouble feature simultaneously judges whether bridge arm reactor occurs short trouble, if short trouble occurs for confirmation bridge arm reactor,
The alternating current inlet wire breaker that alarm or blocking voltage source type inverter and trip voltage source type inverter are connected is issued, or
The exchange that person issues alarm and blocking voltage source type inverter and trip voltage source type inverter are connected after certain time-delay into
Line breaker.
Preferably, the short trouble feature of the bridge arm reactor includes the direct current for flowing through voltage source converter unit
Harmonic component in stream flows through harmonic component in the bridge arm current circulation of voltage source converter unit, the voltage-source type change of current
The harmonic component in harmonic component, voltage source converter unit submodule capacitor voltage in the DC voltage of device unit both ends.
Preferably, the harmonic component includes fundametal compoment, second harmonic component, third-harmonic component, four-time harmonic point
Amount, quintuple harmonics component.
Preferably, when following conditions, at least one meets, short trouble occurs for confirmation bridge arm reactor:
1) it flows through the harmonic component in the DC current of voltage source converter unit and is greater than first harmonic current ration, and
Duration is more than the first detection time definite value；
2) harmonic component flowed through in the bridge arm current circulation of voltage source converter unit is fixed greater than second harmonic electric current
Value, and the duration is more than the second detection time definite value；
3) harmonic component in the DC voltage of voltage source converter unit both ends is greater than first harmonic voltage definite value, and holds
The continuous time is more than third detection time definite value；
4) harmonic component in voltage source converter unit Neutron module capacitance voltage is greater than second harmonic voltage definite value,
And the duration is more than the 4th detection time definite value.
Preferably, the confirmation bridge arm reactor generation short trouble refers in the short trouble feature of bridge arm reactor
Fundametal compoment, second harmonic component, third-harmonic component, four-time harmonic component, in quintuple harmonics component any one or
It is a variety of to be greater than protection definite value.
The present invention also accordingly proposes a kind of Hybrid HVDC system converter fault protective device, the protective device
To contain the DC transmission system for having at least one set of voltage source converter unit, the voltage source converter unit it is every
The bridge arm reactor of a bridge arm is between direct-flow positive pole common point or cathode common point and the converter valve of each bridge arm, the guarantor
Protection unit includes acquisition unit and judges processing unit；
The acquisition unit, for acquiring the DC current for flowing through voltage source converter unit, bridge arm current, voltage source
The DC voltage at type inverter unit both ends, submodule capacitor voltage；
The judgement processing unit, for calculating bridge arm reactor according to each analog quantity of acquisition link acquisition to extract
Short trouble feature simultaneously judges whether bridge arm reactor occurs short trouble, if short trouble occurs for confirmation bridge arm reactor,
The alternating current inlet wire breaker that alarm or blocking voltage source type inverter and trip voltage source type inverter are connected is issued, or
The exchange that person issues alarm and blocking voltage source type inverter and trip voltage source type inverter are connected after certain time-delay into
Line breaker.
Preferably, the short trouble feature of the bridge arm reactor in the judgement processing unit includes flowing through voltage source
Harmonic component in the DC current of type inverter unit, flow through it is humorous in the bridge arm current circulation of voltage source converter unit
Wave component, the harmonic component in the DC voltage of voltage source converter unit both ends, voltage source converter unit submodule electricity
Hold the harmonic component in voltage.
Preferably, the harmonic component includes fundametal compoment, second harmonic component, third-harmonic component, four-time harmonic point
Amount, quintuple harmonics component.
Preferably, when at least one meets when following conditions in the judgement processing unit, confirm bridge arm reactor
Short trouble occurs:
1) it flows through the harmonic component in the DC current of voltage source converter unit and is greater than first harmonic current ration, and
Duration is more than the first detection time definite value；
2) harmonic component flowed through in the bridge arm current circulation of voltage source converter unit is fixed greater than second harmonic electric current
Value, and the duration is more than the second detection time definite value；
3) harmonic component in the DC voltage of voltage source converter unit both ends is greater than first harmonic voltage definite value, and holds
The continuous time is more than third detection time definite value；
4) harmonic component in voltage source converter unit Neutron module capacitance voltage is greater than second harmonic voltage definite value,
And the duration is more than the 4th detection time definite value.
Preferably, the generation short trouble of confirmation bridge arm reactor described in the judgement processing unit refers to bridge arm reactor
Short trouble feature in fundametal compoment, second harmonic component, third-harmonic component, four-time harmonic component, quintuple harmonics point
In amount any one or it is a variety of be greater than protection definite value.
Beneficial effects of the present invention: the present invention can effectively solve the problem that the knowledge of voltage source converter bridge arm reactance short trouble
Other problem, is effectively protected the safety of the equipment such as voltage source converter and bridge arm reactance.
Detailed description of the invention
Fig. 1 is that bridge arm reactor is configured in the voltage source converter cell schematics close to exchange side；
Fig. 2 is that bridge arm reactor is configured in the voltage source converter cell schematics close to DC side；
Fig. 3 is Hybrid HVDC system converter fault guard method schematic diagram of the invention；Fig. 4 is of the invention mixes
Close DC transmission system converter fault protective device；
Fig. 5 is converting plant by thyristor transverter, and Inverter Station is mixed special by the both ends that two kinds of mixed DC inverters form
HVDC transmission system；
Fig. 6 is converting plant by thyristor transverter, and Inverter Station is more by the Mixed cascading that two kinds of mixed DC inverters form
Hold extra-high voltage DC transmission system；
Fig. 7 is the mixing that converting plant 1 and converting plant 2 are made of thyristor transverter, inverter side voltage source converter
Three end DC transmission systems；
Fig. 8 is converting plant by thyristor transverter, and Inverter Station 1 is by thyristor transverter, and Inverter Station 2 is by the voltage-source type change of current
The three end DC transmission system of mixing that device composes in parallel；
Fig. 9 is that converting plant is composed in parallel by thyristor transverter, Inverter Station 1 and Inverter Station 2 by voltage source converter
Three end DC transmission system of mixing.
Specific embodiment
Technical solution of the present invention is described in further detail with specific embodiment with reference to the accompanying drawing, so that ability
The technical staff in domain can better understand the present invention and can be practiced, but illustrated embodiment is not as to limit of the invention
It is fixed.Wherein, identical component uses identical appended drawing reference.
It is illustrated in figure 3 a specific implementation of Hybrid HVDC system converter fault guard method of the invention
Example, the method are changed to contain the DC transmission system for having at least one set of voltage source converter unit, the voltage-source type
The bridge arm reactor for flowing each bridge arm of device unit is located at the change of current of direct-flow positive pole common point or cathode common point and each bridge arm
Between valve, the fault protecting method includes acquisition link and judges processing links；
The acquisition link, for acquiring the DC current for flowing through voltage source converter unit, bridge arm current, voltage source
The DC voltage at type inverter unit both ends, submodule capacitor voltage；
The judgement processing links, for calculating bridge arm reactor according to each analog quantity of acquisition link acquisition to extract
Short trouble feature simultaneously judges whether bridge arm reactor occurs short trouble, if short trouble occurs for confirmation bridge arm reactor,
The alternating current inlet wire breaker that alarm or blocking voltage source type inverter and trip voltage source type inverter are connected is issued, or
The exchange that person issues alarm and blocking voltage source type inverter and trip voltage source type inverter are connected after certain time-delay into
Line breaker.
Wherein, the short trouble feature of the bridge arm reactor includes the DC current for flowing through voltage source converter unit
In harmonic component, flow through harmonic component in the bridge arm current circulation of voltage source converter unit, voltage source converter
The harmonic component in harmonic component, voltage source converter unit submodule capacitor voltage in the DC voltage of unit both ends.
Wherein, the harmonic component includes fundametal compoment, second harmonic component, third-harmonic component, four-time harmonic component,
Quintuple harmonics component.
Wherein, when following conditions, at least one meets, short trouble occurs for confirmation bridge arm reactor:
1) it flows through the harmonic component in the DC current of voltage source converter unit and is greater than first harmonic current ration, and
Duration is more than the first detection time definite value；
2) harmonic component flowed through in the bridge arm current circulation of voltage source converter unit is fixed greater than second harmonic electric current
Value, and the duration is more than the second detection time definite value；
3) harmonic component in the DC voltage of voltage source converter unit both ends is greater than first harmonic voltage definite value, and holds
The continuous time is more than third detection time definite value；
4) harmonic component in voltage source converter unit Neutron module capacitance voltage is greater than second harmonic voltage definite value,
And the duration is more than the 4th detection time definite value.
Wherein, the confirmation bridge arm reactor generation short trouble refers to the base in the short trouble feature of bridge arm reactor
Wave component, second harmonic component, third-harmonic component, four-time harmonic component, in quintuple harmonics component any one or it is more
Kind is greater than protection definite value.
Fig. 4 show a kind of specific embodiment of Hybrid HVDC system converter unit protection device, the protective device
To contain the DC transmission system for having at least one set of voltage source converter unit, the voltage source converter unit it is every
The bridge arm reactor of a bridge arm is between direct-flow positive pole common point or cathode common point and the converter valve of each bridge arm, the guarantor
Protection unit includes acquisition unit and judges processing unit；
The acquisition unit, for acquiring the DC current for flowing through voltage source converter unit, bridge arm current, voltage source
The DC voltage at type inverter unit both ends, submodule capacitor voltage；
The judgement processing unit, for calculating bridge arm reactor according to each analog quantity of acquisition link acquisition to extract
Short trouble feature simultaneously judges whether bridge arm reactor occurs short trouble, if short trouble occurs for confirmation bridge arm reactor,
The alternating current inlet wire breaker that alarm or blocking voltage source type inverter and trip voltage source type inverter are connected is issued, or
The exchange that person issues alarm and blocking voltage source type inverter and trip voltage source type inverter are connected after certain time-delay into
Line breaker.
In preferred embodiment, the short trouble feature of the bridge arm reactor in the judgement processing unit includes stream
Harmonic component in the DC current of overvoltage source type inverter unit, the bridge arm current ring for flowing through voltage source converter unit
Harmonic component in stream, the harmonic component in the DC voltage of voltage source converter unit both ends, voltage source converter unit
Harmonic component in submodule capacitor voltage.
In preferred embodiment, when following conditions, at least one meets, short circuit event occurs for confirmation bridge arm reactor
Barrier:
1) it flows through the harmonic component in the DC current of voltage source converter unit and is greater than first harmonic current ration, and
Duration is more than the first detection time definite value；
2) harmonic component flowed through in the bridge arm current circulation of voltage source converter unit is fixed greater than second harmonic electric current
Value, and the duration is more than the second detection time definite value；
3) harmonic component in the DC voltage of voltage source converter unit both ends is greater than first harmonic voltage definite value, and holds
The continuous time is more than third detection time definite value；
4) harmonic component in voltage source converter unit Neutron module capacitance voltage is greater than second harmonic voltage definite value,
And the duration is more than the 4th detection time definite value；
In preferred embodiment, confirmation bridge arm reactor described in the judgement processing unit occurs short trouble and refers to bridge
Fundametal compoment in the short trouble feature of arm reactor, second harmonic component, third-harmonic component, four-time harmonic component, five
In order harmonic components any one or it is a variety of be greater than protection definite value.
It is illustrated below with reference to specific Hybrid HVDC system.As shown in figure 5, Hybrid HVDC system includes:
Converter station and inversion converter station are rectified, the two is connected by two DC power transmission lines, in which: rectification converter station is used for sending end
The three-phase alternating current of AC network is converted to and sends inversion converter station, sending end alternating current to by DC power transmission line after direct current
Passive filter can be connected on the bus that net enters the station, it is also possible to do not have, need to be determined according to system engineering condition, when sending end by
When thyristor transverter forms, installing passive filter is generally required, also needs to install reactive-load compensation capacitor sometimes.In Fig. 5
Rectification converter station is composed in series by two groups of thyristor transverter units, series connection node connection earthing pole, and positive and negative two after series connection
End is connected by smoothing reactor with DC power transmission line；DC filtering is installed between DC line and the earth simultaneously
Device.
Thyristor transverter unit is using 12 pulsation bridge circuits；Wherein, each bridge arm is by several thyristor strings
Connection is constituted, and thyristor transverter is controlled using dc power control strategy is determined.Thyristor transverter passes through a mode of connection point
Not Wei the three-winding transformer of Y0/Y/ Δ connect with sending end AC network.Transformer can be to three intersections of sending end AC system
Galvanic electricity carries out voltage class transformation, and to adapt to required DC voltage level, the transformer secondary mode of connection is not all 12
The two six pulse conversion bridges up and down for bridge-type thyristor transverter of pulsing provide the three-phase alternating current that phase angle difference is 30 °, to reduce
Flow into the harmonic current of power grid.
Inversion converter station is changed for being conveyed to receiving end AC network after direct current is converted to three-phase alternating current by four
Stream station is constituted, including station 2, stand 3, stand 4 and station 5, stand and 2 and is stood 3, stands 4,5 series connections of standing.2 are stood by two groups of thyristor transverters
Composition, thyristor transverter are respectively that the three-winding transformer of Y0/Y/ Δ and receiving end AC network connect by a mode of connection
It connects, thyristor transverter uses constant DC voltage control.It stands 3, stands 4,5 three stations of standing are connected in parallel, and every station is by two groups of voltage sources
Type inverter is composed in series, and series connection node connects earthing pole, the bridge arm reactor position of each bridge arm of voltage source converter
Between direct-flow positive pole common point or cathode common point and the converter valve of each bridge arm, voltage source converter passes through a wiring
Mode is that the two-winding transformer of Y0/ Δ is connect with receiving end AC network, wherein the voltage source converter at station 3, which uses, determines direct current
Voltage and determine Reactive Power Control policy control, stand 4 voltage source converter using determining AC power and determine reactive power control
Policy control processed, stand 5 voltage source converter using determine AC power and to determine Reactive Power Control policy control.
By taking station 3 as an example, 3 voltage source converter of standing acquires the bridge arm current for flowing through him in real time, and extracts its circulation
In fundametal compoment, second harmonic component, third-harmonic component, four-time harmonic component, quintuple harmonics component.When fundamental wave therein
Component is more than that fundamental current protects definite value, and the duration is more than the first detection time definite value, then confirms that bridge arm reactor occurs
Short trouble；Or when second harmonic component therein is more than that second harmonic current protects definite value, and the duration is more than first
Detection time definite value then confirms that short trouble occurs for bridge arm reactor；Or when third-harmonic component therein is more than humorous three times
Wave current protection definite value, and the duration is more than the first detection time definite value, then confirms that short trouble occurs for bridge arm reactor；Or
Person is more than four-time harmonic current protection definite value when four-time harmonic component therein, and the duration is more than that the first detection time is fixed
Value then confirms that short trouble occurs for bridge arm reactor；Or when quintuple harmonics component therein is more than quintuple harmonics current protection
Definite value, and the duration is more than the first detection time definite value, then confirms that short trouble occurs for bridge arm reactor；
Or when fundametal compoment therein is more than that fundamental current protects definite value, and the duration is more than that the first detection time is fixed
Value, and second harmonic component therein protects definite value also above second harmonic current, the duration is more than that the first detection time is fixed
Value then confirms that short trouble occurs for bridge arm reactor；Or when fundametal compoment therein is more than that fundamental current protects definite value, and holds
The continuous time is more than the first detection time definite value, and third-harmonic component therein protects definite value also above triple harmonic current, holds
The continuous time is more than the first detection time definite value, then confirms that short trouble occurs for bridge arm reactor；Or work as fundametal compoment therein
Definite value is protected more than fundamental current, and the duration is more than the first detection time definite value, and four-time harmonic component therein also surpasses
Four-time harmonic current protection definite value is crossed, the duration is more than the first detection time definite value, then confirms that short circuit occurs for bridge arm reactor
Failure；Or working as fundametal compoment therein is more than that fundamental current protects definite value, and the duration is more than the first detection time definite value,
And quintuple harmonics component therein, also above quintuple harmonics current protection definite value, the duration is more than the first detection time definite value,
Then confirm that short trouble occurs for bridge arm reactor；
Or when second harmonic component therein is more than that second harmonic current protects definite value, the duration is more than the first detection
Time definite value, and third-harmonic component therein protects definite value also above triple harmonic current, the duration is more than the first detection
Time definite value then confirms that short trouble occurs for bridge arm reactor；Or when second harmonic component therein is more than second harmonic electricity
Stream protection definite value, the duration is more than the first detection time definite value, and four-time harmonic component therein is also above four-time harmonic electricity
Stream protection definite value, the duration is more than the first detection time definite value, then confirms that short trouble occurs for bridge arm reactor；Or work as it
In second harmonic component be more than second harmonic current protect definite value, the duration is more than the first detection time definite value, and wherein
Quintuple harmonics component also above quintuple harmonics current protection definite value, the duration is more than the first detection time definite value, then confirms
Short trouble occurs for bridge arm reactor；
Or when fundametal compoment therein is more than that fundamental current protects definite value, the duration is more than that the first detection time is fixed
Value, and second harmonic component therein protects definite value also above second harmonic current, the duration is more than that the first detection time is fixed
Value, and third-harmonic component therein protects definite value also above triple harmonic current, the duration is more than that the first detection time is fixed
Value then confirms that short trouble occurs for bridge arm reactor；Or working as fundametal compoment therein is more than that fundamental current protects definite value, is continued
Time is more than the first detection time definite value, and second harmonic component therein protects definite value also above second harmonic current, is continued
Time is more than the first detection time definite value, and four-time harmonic component therein continues also above four-time harmonic current protection definite value
Time is more than the first detection time definite value, then confirms that short trouble occurs for bridge arm reactor；Or when fundametal compoment therein is super
Fundamental current protection definite value is crossed, the duration is more than the first detection time definite value, and second harmonic component therein is also above two
Subharmonic current protects definite value, and the duration is more than the first detection time definite value, and quintuple harmonics component therein is also above five
Subharmonic current protects definite value, and the duration is more than the first detection time definite value, then confirms that short trouble occurs for bridge arm reactor；
Or when second harmonic component therein is more than that second harmonic current protects definite value, the duration is more than the first detection
Time definite value, and third-harmonic component therein protects definite value also above triple harmonic current, the duration is more than the first detection
Time definite value, and four-time harmonic component therein, also above four-time harmonic current protection definite value, the duration is more than the first detection
Time definite value then confirms that short trouble occurs for bridge arm reactor；Or when second harmonic component therein is more than second harmonic electricity
Stream protection definite value, the duration is more than the first detection time definite value, and four-time harmonic component therein is also above four-time harmonic electricity
Stream protection definite value, the duration is more than the first detection time definite value, and quintuple harmonics component therein is also above quintuple harmonics electricity
Stream protection definite value, the duration is more than the first detection time definite value, then confirms that short trouble occurs for bridge arm reactor；Or work as it
In third-harmonic component be more than triple harmonic current protect definite value, the duration is more than the first detection time definite value, and wherein
Four-time harmonic component also above four-time harmonic current protection definite value, the duration is more than the first detection time definite value, and wherein
Quintuple harmonics component also above quintuple harmonics current protection definite value, the duration is more than the first detection time definite value, then confirms
Short trouble occurs for bridge arm reactor；
Or when fundametal compoment therein is more than that fundamental current protects definite value, the duration is more than that the first detection time is fixed
Value, and second harmonic component therein protects definite value also above second harmonic current, the duration is more than that the first detection time is fixed
Value, and third-harmonic component therein protects definite value also above triple harmonic current, the duration is more than that the first detection time is fixed
Value, and four-time harmonic component therein, also above four-time harmonic current protection definite value, the duration is more than that the first detection time is fixed
Value then confirms that short trouble occurs for bridge arm reactor；Or working as fundametal compoment therein is more than that fundamental current protects definite value, is continued
Time is more than the first detection time definite value, and second harmonic component therein protects definite value also above second harmonic current, is continued
Time is more than the first detection time definite value, and third-harmonic component therein protects definite value also above triple harmonic current, is continued
Time is more than the first detection time definite value, and quintuple harmonics component therein continues also above quintuple harmonics current protection definite value
Time is more than the first detection time definite value, then confirms that short trouble occurs for bridge arm reactor；Or when fundametal compoment therein is super
Fundamental current protection definite value is crossed, the duration is more than the first detection time definite value, and second harmonic component therein is also above two
Subharmonic current protects definite value, and the duration is more than the first detection time definite value, and four-time harmonic component therein is also above four
Subharmonic current protects definite value, and the duration is more than the first detection time definite value, and quintuple harmonics component therein is also above five
Subharmonic current protects definite value, and the duration is more than the first detection time definite value, then confirms that short trouble occurs for bridge arm reactor；
Or when fundametal compoment therein is more than that fundamental current protects definite value, the duration is more than the first detection time definite value, and wherein
Four-time harmonic component also above four-time harmonic current protection definite value, the duration is more than the first detection time definite value, and wherein
Third-harmonic component also above triple harmonic current protect definite value, the duration is more than the first detection time definite value, and wherein
Quintuple harmonics component also above quintuple harmonics current protection definite value, the duration is more than the first detection time definite value, then confirms
Short trouble occurs for bridge arm reactor；
If confirming, short trouble occurs for bridge arm reactor, issues alarm or blocking voltage source type inverter and trip voltage
The alternating current inlet wire breaker or issue alarm that source type inverter is connected, and the blocking voltage source type inverter after certain time-delay
And the alternating current inlet wire breaker that trip voltage source type inverter is connected.
Scheme provided by the invention is suitable for Hybrid HVDC system as shown in Figure 5 and Figure 6, but is not limited to both
Transmission system, such as Fig. 7, Fig. 8, three end DC transmission systems of mixing shown in Fig. 9 are also applied for the present invention, and the present invention is suitable for institute
It is some that there are the DC transmission systems of voltage source converter.
Beneficial effects of the present invention: the present invention can effectively solve the problem that the knowledge of voltage source converter bridge arm reactance short trouble
Other problem, is effectively protected the safety of the equipment such as voltage source converter and bridge arm reactance.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure made by bright specification and accompanying drawing content perhaps equivalent process transformation or be directly or indirectly used in other correlation
Technical field, be included within the scope of the present invention.
Claims (10)
1. a kind of Hybrid HVDC system converter fault guard method, which is characterized in that the method to contain have to
The DC transmission system of few one group of voltage source converter unit, the bridge arm of each bridge arm of the voltage source converter unit
Reactor is between direct-flow positive pole common point or cathode common point and the converter valve of each bridge arm, the fault protecting method packet
Link and processing links are judged containing acquisition；
The acquisition link, for acquiring the DC current for flowing through voltage source converter unit, bridge arm current, voltage-source type is changed
Flow the DC voltage at device unit both ends, submodule capacitor voltage；
The judgement processing links extract the short circuit for calculating bridge arm reactor for each analog quantity according to acquisition link acquisition
Fault signature simultaneously judges whether bridge arm reactor occurs short trouble, if short trouble occurs for confirmation bridge arm reactor, issues
The alternating current inlet wire breaker that alarm or blocking voltage source type inverter and trip voltage source type inverter are connected, Huo Zhefa
It alerts out and the type inverter alternating current inlet wire that simultaneously trip voltage source type inverter is connected in blocking voltage source is disconnected after certain time-delay
Road device.
2. a kind of Hybrid HVDC system converter fault guard method as described in claim 1, which is characterized in that described
The short trouble feature of bridge arm reactor includes harmonic component in the DC current for flow through voltage source converter unit, flows through
In harmonic component, voltage source converter unit both ends DC voltage in the bridge arm current circulation of voltage source converter unit
Harmonic component, the harmonic component in voltage source converter unit submodule capacitor voltage.
3. a kind of Hybrid HVDC system converter fault guard method as described in claim 1, which is characterized in that described
Harmonic component includes fundametal compoment, second harmonic component, third-harmonic component, four-time harmonic component, quintuple harmonics component.
4. a kind of Hybrid HVDC system converter fault guard method as claimed in claim 2, which is characterized in that instantly
State condition at least one when meeting, short trouble occurs for confirmation bridge arm reactor:
1) it flows through the harmonic component in the DC current of voltage source converter unit and is greater than first harmonic current ration, and continue
Time is more than the first detection time definite value；
2) it flows through the harmonic component in the bridge arm current circulation of voltage source converter unit and is greater than second harmonic current ration, and
Duration is more than the second detection time definite value；
3) harmonic component in the DC voltage of voltage source converter unit both ends be greater than first harmonic voltage definite value, and continue when
Between be more than third detection time definite value；
4) harmonic component in voltage source converter unit Neutron module capacitance voltage is greater than second harmonic voltage definite value, and holds
The continuous time is more than the 4th detection time definite value.
5. a kind of Hybrid HVDC system converter fault guard method as claimed in claim 4, which is characterized in that described
Confirmation bridge arm reactor occurs short trouble and refers to the fundametal compoment in the short trouble feature of bridge arm reactor, second harmonic point
Amount, third-harmonic component, four-time harmonic component, in quintuple harmonics component any one or a variety of be greater than protection definite value.
6. a kind of Hybrid HVDC system converter fault protective device, which is characterized in that the protective device to contain
There is the DC transmission system of at least one set of voltage source converter unit, each bridge arm of the voltage source converter unit
Bridge arm reactor is between direct-flow positive pole common point or cathode common point and the converter valve of each bridge arm, the protective device packet
It includes acquisition unit and judges processing unit；
The acquisition unit, for acquiring the DC current for flowing through voltage source converter unit, bridge arm current, voltage-source type is changed
Flow the DC voltage at device unit both ends, submodule capacitor voltage；
The judgement processing unit extracts the short circuit for calculating bridge arm reactor for each analog quantity according to acquisition link acquisition
Fault signature simultaneously judges whether bridge arm reactor occurs short trouble, if short trouble occurs for confirmation bridge arm reactor, issues
The alternating current inlet wire breaker that alarm or blocking voltage source type inverter and trip voltage source type inverter are connected, Huo Zhefa
It alerts out and the type inverter alternating current inlet wire that simultaneously trip voltage source type inverter is connected in blocking voltage source is disconnected after certain time-delay
Road device.
7. a kind of Hybrid HVDC system converter fault protective device as claimed in claim 6, which is characterized in that described
The short trouble feature for judging the bridge arm reactor in processing unit includes the direct current for flowing through voltage source converter unit
Harmonic component in electric current, flow through harmonic component in the bridge arm current circulation of voltage source converter unit, voltage-source type changes
Flow the harmonic component in the DC voltage of device unit both ends, the harmonic wave in voltage source converter unit submodule capacitor voltage point
Amount.
8. a kind of Hybrid HVDC system converter fault protective device as claimed in claim 7, which is characterized in that described
Harmonic component includes fundametal compoment, second harmonic component, third-harmonic component, four-time harmonic component, quintuple harmonics component.
9. a kind of Hybrid HVDC system converter fault protective device as claimed in claim 7, which is characterized in that described
When judging that at least one meets when following conditions in processing unit, short trouble occurs for confirmation bridge arm reactor:
1) it flows through the harmonic component in the DC current of voltage source converter unit and is greater than first harmonic current ration, and continue
Time is more than the first detection time definite value；
2) it flows through the harmonic component in the bridge arm current circulation of voltage source converter unit and is greater than second harmonic current ration, and
Duration is more than the second detection time definite value；
3) harmonic component in the DC voltage of voltage source converter unit both ends be greater than first harmonic voltage definite value, and continue when
Between be more than third detection time definite value；
4) harmonic component in voltage source converter unit Neutron module capacitance voltage is greater than second harmonic voltage definite value, and holds
The continuous time is more than the 4th detection time definite value.
10. a kind of Hybrid HVDC system converter fault protective device as claimed in claim 9, which is characterized in that institute
It states and judges that confirmation bridge arm reactor described in processing unit occurs short trouble and refers in the short trouble feature of bridge arm reactor
Fundametal compoment, second harmonic component, third-harmonic component, four-time harmonic component, in quintuple harmonics component any one or
Person is a variety of to be greater than protection definite value.
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| CN114156933A (en) * | 2021-12-03 | 2022-03-08 | 西安端怡科技有限公司 | Method for coping after MMMC bridge arm fault |
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| CN112952890A (en) * | 2021-03-15 | 2021-06-11 | 南方电网科学研究院有限责任公司 | Short-circuit protection method and device for bridge arm reactor of flexible direct-current power transmission system |
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