CN103296671B - For flexible direct current power transmission system AC overvoltage protection and guard method - Google Patents
For flexible direct current power transmission system AC overvoltage protection and guard method Download PDFInfo
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- CN103296671B CN103296671B CN201310121167.9A CN201310121167A CN103296671B CN 103296671 B CN103296671 B CN 103296671B CN 201310121167 A CN201310121167 A CN 201310121167A CN 103296671 B CN103296671 B CN 103296671B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
- H02H7/1252—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to overvoltage in input or output, e.g. by load dump
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The present invention relates to a kind of for flexible direct current power transmission system AC overvoltage protection and guard method.Protection device is connected in parallel on converter transformer valve-side earth resistance two ends; for at alternating current circuit I(4) or DC line (8) break down and cause alternating current circuit (8) overvoltage or when valve base controller detects alternating current circuit I(4) fault that is short-circuited time; carry out action and draw away fault current; suppression alternating current circuit I(4) overvoltage level, protection converter valve valve body (9).The protection device that the present invention proposes is swift in motion, and through-flow energy is strong, absorbs energy big, can quickly protect valve body.Without the control protective unit that 26S Proteasome Structure and Function is complicated.Simple in construction, low cost, it is easy to accomplish；Reduce alternating current circuit and converter valve insulation costs；Ensure alternating current circuit and converter valve equipment safety；Improve current conversion station fault-resistant ability；Ensure flexible direct current power transmission system safe and stable operation.
Description
Technical field
The present invention relates to flexible direct current power transmission system field, be specifically related to a kind of for flexible direct current power transmission system AC overvoltage
Protection device and guard method.
Background technology
Flexible DC power transmission is a kind of novel high voltage dc transmission technology, and it passes through voltage converter, at hydroelectric power plant or fire
At the power supplys such as power plant, conventional AC electricity is become unidirectional current, by the transmission line such as aerial line or cable, electric power is delivered to a distant place and bears
He Chu.Compared with conventional high-tension direct current transportation, having controllability strong, trend reversion is easily, it is not necessary to the advantages such as reactive-load compensation.
Flexible direct current power transmission system is made up of three parts, including two current conversion stations being positioned at power supply and load, and connects two stations
Direct current cables or aerial line, wherein nucleus equipment is flexible direct current converter valve, and its safety needs to obtain reliable by protection system
Guarantee.
Current conversion station has a converter valve 5 that can switch between alternating current circuit I and DC line 8, including through alternating current circuit I
And the power semiconductor valve 9 between DC line 8, by such power semiconductor valve by parameters of electric power between AC and DC
Conversion.Additionally, there is a converter power transformer 3 between alternating current circuit I and alternating current circuit II, it is star-like in I valve side, alternating current circuit
Connection, its neutral point passes through resistance 6 ground connection.
Flexible direct current converter station fault is generally divided into AC fault, DC side fault and converter valve fault three kinds, AC and DC side
Error protection by Ore-controlling Role of standing (by groups such as voltage transformer, current transformer, the protection of alternating current-direct current side filter, tranformer protections
Part forms) realize.
In flexible direct current converter station, DC protection system mainly, overvoltage protection under-voltage by direct current judges DC system fault at present
Situation, when current conversion station internal communication circuit I is single-phase or DC line 8 occurs one pole ground short circuit fault, alternating current circuit I's
Healthy phases voltage may bring up to 1.5～2 times of normal operating voltage, and power semiconductor valve 9 may bear too high event
Hinder voltage and damage.
Conventional power semiconductors valve 9 protective measure primary parallel gapless MOV.This guard method is generally by gapless MOV also
It is associated in the two ends of power semiconductor valve 9, utilizes the voltage x current nonlinear characteristic of MOV, it would be possible to produce the energy of overvoltage
Consumed by MOV so that by protection equipment from the impact of overvoltage, but the method exist action parameter be difficult to adjust,
Energy stress is excessive, turn on the defects such as uncontrollable.And there is structure in other traditional circuit protection device such as bypass thyristor switch
Complexity, movement time is slow, bear the shortcomings such as overcurrent capability is low.For the problems referred to above, on converter power transformer earth resistance also
Connection increases the protection device of the present invention can effectively reduce alternating current circuit overvoltage, it is to avoid cause damage to inside change of current valve body.
Summary of the invention
For the deficiencies in the prior art, it is an object of the invention to provide a kind of AC being applicable to flexible direct current power transmission system the most electric
Pressure protection device and guard method, protection device uses overvoltage or pressure to puncture element raising overvoltage protection performance, solves well
Alternating current circuit overvoltage problem in the station that flexible direct current power transmission system of having determined fault causes.
When generally alternating current circuit I occurs singlephase earth fault or DC line generation one pole ground short circuit fault, alternating current circuit I is non-
Faulted phase voltage can raise.According to predefined voltage, adjust ground connection and puncture gap, when voltage is less than setting breakdown voltage,
Protection device is not turned on, transmission system can normal delivering power, and once overvoltage reaches setting value, and protection device is breakdown,
Producing electric spark, short circuit current is imported into the earth, suppression alternating current circuit I overvoltage, it is to avoid converter valve valve body 9 by this gap
Damage because of overvoltage with alternating current circuit I.
It is an object of the invention to use following technical proposals to realize:
A kind of for flexible direct current power transmission system AC overvoltage protection, described protection device is included in the flexible direct current change of current
Stand 1, be included between alternating current circuit I and DC line 8 the flexible direct current converter valve 5 of switching, described alternating current circuit I and AC line
Being provided with converter power transformer 3 between the II of road, described converter power transformer 3 is star-like connection in I valve side, alternating current circuit, and its neutral point is led to
Cross earth resistance 6 ground connection；Described converter power transformer 3 is triangular form or star-like connection in alternating current circuit II net side；
It thes improvement is that, described protection device 7, is parallel to earth resistance 6 two ends of converter power transformer 3, for handing over
Flow Line I or DC line 8 break down and cause alternating current circuit 8 overvoltage or when valve base controller detects that alternating current circuit I sends out
During raw short trouble, carry out action and draw away fault current, suppression alternating current circuit I overvoltage level, protect converter valve valve body 9.
Preferably, described protection device 7 uses the breakover element of spark gap；Described spark gap ground connection.
Preferably, described converter valve 5 is three-phase six bridge arm structure；Each brachium pontis is formed by converter valve valve body 9；The described change of current
Valve body 9 uses thyristor to realize, including can turn off semiconductor device (such as IGBT, IGET, IGCT or
And diode antiparallel with it GTO).
The one that the present invention provides based on another object is used for flexible direct current power transmission system AC over-voltage protection method, and it improves
Part is, the protection device 7 of described method is parallel to earth resistance 6 two ends of converter power transformer 3；Described method includes
Following step:
Whether A, detection alternating current circuit break down, and described fault includes alternating current circuit I single-phase, two-phase earth fault, AC line
Road 8 monopolar grounding fault and bipolar short trouble；
B, when there is alternating current circuit I singlephase earth fault or during DC line monopolar grounding fault, spark gap both end voltage raises
To breakdown voltage, spark gap is punctured；
Maybe when controlling device and AC line short circuit fault being detected, described control device sends trigger command to afterflow gap, by force
System triggers afterflow gap, is punctured by spark gap；
Fault current is caused greatly after puncturing by spark gap；
After C, spark gap puncture, send return status information to controlling device, and issue block signal to converter valve 5, real
Now protection converter valve valve body 9.
Preferably, detect that the relaying configuration method of alternating current circuit I electric voltage over press is that alternating current circuit I voltage exceedes preset value,
And the persistent period also reaches preset value, then protection device turns on immediately, simultaneously the triggering of valve base controller locking inverter immediately
Pulse.
Preferably, the self-breakdown voltage size preset is the most breakdown when the alternating current circuit non-overvoltage of I voltage, at alternating current circuit I electricity
Pressing through during pressure breakdown, its this self-breakdown voltage size (self-breakdown voltage size is 1.3-1.8 times of circuit rated voltage) is by reason
Opinion calculating, Computer Simulation or test determine.
Preferably, when puncturing, discharge current size (when puncturing, discharge current size is 1.5-20 circuit rated current) is by theory
Calculating, Computer Simulation or test determine.
Preferably, (absorbing energy size when puncturing is above-mentioned voltage with the product of electric current in time to absorb energy size when puncturing
Integration) determined by Theoretical Calculation, Computer Simulation or test.
Compared with the prior art, the present invention reaches to provide the benefit that:
1, the protection device that the present invention proposes is swift in motion, and through-flow energy is strong, absorbs energy big, can quickly protect valve body.
2, the control protective unit complicated without 26S Proteasome Structure and Function that the present invention proposes.
3, the protection device simple in construction that the present invention proposes, low cost, it is easy to accomplish.
4, alternating current circuit and converter valve insulation costs are reduced；
5, alternating current circuit and converter valve equipment safety are ensured；
6, current conversion station fault-resistant ability is improved；
7, flexible direct current power transmission system safe and stable operation is ensured.
Accompanying drawing explanation
Fig. 1 is for flexible direct current power transmission system AC overvoltage protection schematic diagram；
Wherein: 1-flexible direct current converter station；2-alternating current circuit II；3-converter power transformer；4-alternating current circuit I；5-converter valve；6-
Resistance；7-protection device；8-DC line；9-converter valve valve body.
Detailed description of the invention
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is further illustrated in detail.
The present invention provide for flexible direct current power transmission system alternating current circuit I and converter valve overvoltage protection as it is shown in figure 1,
Protection device is included between alternating current circuit I and DC line 8 converter valve 5 of switching, described alternating current circuit I and alternating current circuit II
Between be provided with converter power transformer 3, described converter power transformer 3 is star-like connection in I valve side, alternating current circuit, and its neutral point passes through ground connection
Resistance 6 ground connection；Described converter power transformer 3 is triangular form or star-like connection in alternating current circuit II net side.
Converter valve 5 is three-phase six bridge arm structure；Each brachium pontis is formed by converter valve valve body 9；Described converter valve valve body 9 uses
Thyristor realizes, including IGBT and diode antiparallel with it.Its version includes but not limited to module
Change many level, H bridge chain type, IGBT series connection.
On neutral resistance 6 two ends of described protection device 7 converter power transformer in parallel, in alternating current circuit I, AC line
Road fault causes overvoltage or when valve base controller detects alternating current circuit I failed shorted, carries out action and draws away fault current,
Suppression alternating current circuit I overvoltage level, protects converter valve valve body 9.
Protection device 7 uses spark gap breakover element；Spark gap ground connection.
The operation principle of the spark gap of the employing that the present invention provides is as follows:
When spark gap makes its voltage exceed from trigger voltage because of alternating current circuit I single-phase earthing or DC line monopolar grounding fault,
Seal clearance triggers automatically.
Or when converter valve control protective unit detects change of current alternating current circuit I (4) short trouble, sent by force by optical fiber or cable
Trigger command processed makes its gap force conducting, makes short circuit current flow fast through seal clearance.
The breakdown voltage size preset need to ensure that device will not be breakdown when the non-overvoltage of AC line voltage, and at alternating current circuit electricity
Can be breakdown when pressing through pressure, the collocation method of its size is for determine by Theoretical Calculation, Computer Simulation or test.Put when puncturing
The collocation method of electricity size of current is for determine by Theoretical Calculation, Computer Simulation or test.Joining of energy size is absorbed when puncturing
Method of putting is for determine by Theoretical Calculation, Computer Simulation or test.
(1) according to flexible direct current short trouble Theoretical Calculation, Computer Simulation, test determine spark gap breakdown voltage,
Short circuit current, absorption energy particular content are as follows:
The process of Theoretical Calculation is: converter power transformer net side ac bus 2 is equivalent to a voltage source UsWith internal impedance ZsString
Connection, according to converter power transformer 3 no-load voltage ratio k and consider the transformator anti-X of valve side leakageL, by voltage source UsWith internal impedance ZsConversion is extremely
Transformator valve side.
Equivalence to the electromotive force of source of transformator valve side is: Us2=kUs；
Internal resistance is: Zs2=k2Zs+XL；
With transformator voltage on valve side U time properly functionings20As initial condition, according to (or the exchange of DC line at fault ground
Circuit II is single-phase) voltage is the feature of 0, sets up the voltage mathematical table in earth fault process of reflection ac bus healthy phases
Reach formula, calculate the false voltage expression formula of the interior ac bus in station according to initial condition and expression formula；
Ac bus healthy phases voltage u after faultacnT () is converter transformer valve-side initial voltage Us20, line impedance Zs2With connect
Ground impedance ZnFunction: uacn(t)=F (Us20,Zs2,Zn,t)；T express time.
The breakdown voltage of spark gap is determined, it is ensured that this breakdown voltage is higher than alternating current circuit in station time properly functioning according to each phase voltage
Voltage peak (preferably 1.2 times), less than the maximum of ac bus voltage during fault.In conjunction with the mathematical model of spark gap,
The discharge current of spark gap, absorption energy under false voltage effect can be calculated.
The process of Computer Simulation is: set up in computer simulation software valve system, the transformator such as comprise, stand in DC line,
Converter valve and the phantom of earth fault, emulated by single-phase, two-phase earth fault the most in the same time, obtains station during fault interior
The amplitude of ac bus healthy phases voltage.The breakdown voltage of spark gap is determined, it is ensured that this breakdown voltage is higher than according to this voltage
Ac bus voltage (preferably 1.2 times) in station time properly functioning, less than the maximum of alternating voltage during fault.Soft in emulation
Part is set up the model of spark gap, the maximum current flow through according to spark gap during fault, determine the maximum that spark gap allows
Electric current.Determine that spark gap needs the energy absorbed according to high-breakdown-voltage and permission maximum current.
(2) spacing distance of spark gap is determined according to breakdown voltage；Breakdown voltage U is between gas pressure P and two electrodes
Distance d and the function of absolute temperature T: U=f(pd/T).
(3) spark gap parallel connection one end is installed on converter transformer valve-side neutral resistance 6, other end ground connection；
(4) as accompanying drawing 1 is when occurring alternating current circuit I single-phase, two-phase ground connection or DC line monopolar grounding fault, between spark
Gap both end voltage is increased to breakdown voltage, thus is punctured by spark gap；Or when alternating current circuit is short-circuited fault, voltage is surveyed
Amount device or protection device monitoring spark gap both end voltage, pilot spark gap, by triggered gap forced-triggered afterflow gap,
Spark gap is punctured.
(5) short-circuit current flows through from spark gap, it is suppressed that alternating current circuit overvoltage level in standing, it is to avoid the change of current
The overvoltage of valve body；
(6) after spark gap punctures, returning status information to control protective unit, control protective unit detects spark gap
While puncturing, issue block signal to converter valve.
The invention still further relates to a kind of converter valve guard method for alternating current circuit fault, the protection device 7 of described method is in parallel
In converter transformer valve-side neutral resistance 6 two ends；Described method comprises the steps:
Whether A, detection protection device break down, and described fault includes alternating current circuit I single-phase earthing 10, DC line one pole
Earth fault 10 and bipolar short trouble；
B, when alternating current circuit I single-phase earthing occurring or during DC line monopolar grounding fault, spark gap both end voltage is increased to hit
Wear voltage, disruptive spark gap；
In described step B, when occur alternating current circuit monopolar grounding fault time, i.e. the voltage of spark gap exceed its from trigger voltage,
Spark gap triggers automatically.
Maybe when there is AC line short circuit fault, described protection device sends trigger command, forced-triggered afterflow to spark gap
Gap, punctures spark gap；
After C, spark gap puncture, send return status information to controlling device, and issue block signal to converter valve 5, real
Now protection converter valve valve body 9.
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit, although reference
The present invention has been described in detail by above-described embodiment, those of ordinary skill in the field it is understood that still can to this
Invention detailed description of the invention modify or equivalent, and without departing from spirit and scope of the invention any amendment or etc.
With replacing, it all should be contained in the middle of scope of the presently claimed invention.
Claims (5)
1., for a flexible direct current power transmission system AC over-voltage protection method, the device of described method is straight for flexibility
Stream transmission system AC overvoltage protection, described protection device is included among flexible direct current converter station (1), is included in
The flexible direct current converter valve (5) of switching between alternating current circuit I (4) and DC line (8), described alternating current circuit I (4) and friendship
Being provided with converter power transformer (3) between Flow Line II (2), described converter power transformer (3) is star in alternating current circuit I (4) valve side
Type connects, and its neutral point passes through earth resistance (6) ground connection；Described converter power transformer (3) in alternating current circuit II (2) net side is
Triangular form or star-like connection；
Described protection device (7), is parallel to earth resistance (6) two ends of converter power transformer (3), at alternating current circuit I
Or DC line (8) breaks down and causes DC line (8) overvoltage or alternating current circuit I detected when valve base controller (4)
(4), during the fault that is short-circuited, carry out action and draw away fault current, suppress alternating current circuit I (4) overvoltage level, protect the change of current
Valve body (9)；
Described protection device (7) uses spark gap breakover element；Described spark gap ground connection；
Described converter valve (5) is three-phase six bridge arm structure；Each brachium pontis is formed by converter valve valve body (9)；Described converter valve
Valve body (9) uses thyristor to realize, including the semiconductor device that can turn off and diode antiparallel with it；
It is characterized in that, the protection device (7) of described method is parallel to earth resistance (6) two ends of converter power transformer (3)；
Described method comprises the steps:
A, detection alternating current circuit whether break down, described fault include alternating current circuit I (4) single-phase, two-phase earth fault,
DC line (8) monopolar grounding fault and bipolar short trouble；
B, when I (4) singlephase earth fault in alternating current circuit occurring or during DC line monopolar grounding fault, spark gap two ends electricity
Pressure is increased to breakdown voltage, is punctured by spark gap；
Maybe when controlling device and AC line short circuit fault being detected, described control device sends trigger command to afterflow gap, by force
System triggers afterflow gap, is punctured by spark gap；
Fault current is caused greatly after puncturing by spark gap；
After C, spark gap puncture, send return status information to controlling device, and issue block signal to converter valve (5),
Realize protection converter valve valve body (9).
AC over-voltage protection method the most according to claim 1, it is characterised in that alternating current circuit I (4) electricity detected
The relaying configuration method pressing through pressure is that alternating current circuit I (4) voltage exceedes preset value, and the persistent period also reaches to preset
Value, then protection device turns on immediately, simultaneously the triggering pulse of valve base controller locking inverter immediately.
AC over-voltage protection method the most according to claim 1, it is characterised in that default self-breakdown voltage size
When the non-overvoltage of alternating current circuit I (4) voltage the most breakdown, breakdown when alternating current circuit I (4) electric voltage over press, its this certainly hit
Wear voltage swing to be determined by Theoretical Calculation, Computer Simulation or test.
AC over-voltage protection method the most according to claim 1, it is characterised in that when puncturing, discharge current size is led to
Cross Theoretical Calculation, Computer Simulation or test to determine.
AC over-voltage protection method the most according to claim 1, it is characterised in that absorb energy size when puncturing and lead to
Cross Theoretical Calculation, Computer Simulation or test to determine.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310121167.9A CN103296671B (en) | 2013-04-09 | 2013-04-09 | For flexible direct current power transmission system AC overvoltage protection and guard method |
| PCT/CN2013/074826 WO2014166130A1 (en) | 2013-04-09 | 2013-04-26 | Overvoltage protection device and protection method for alternating current side of flexible direct current transmission system |
| PCT/CN2013/087804 WO2014166262A1 (en) | 2013-04-09 | 2013-11-26 | Overvoltage protection device and protection method for alternating-current side of flexible direct-current power transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310121167.9A CN103296671B (en) | 2013-04-09 | 2013-04-09 | For flexible direct current power transmission system AC overvoltage protection and guard method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103296671A CN103296671A (en) | 2013-09-11 |
| CN103296671B true CN103296671B (en) | 2016-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310121167.9A Active CN103296671B (en) | 2013-04-09 | 2013-04-09 | For flexible direct current power transmission system AC overvoltage protection and guard method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN103296671B (en) |
| WO (2) | WO2014166130A1 (en) |
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| CN103296671B (en) * | 2013-04-09 | 2016-08-10 | 国家电网公司 | For flexible direct current power transmission system AC overvoltage protection and guard method |
| CN104300518B (en) * | 2014-10-13 | 2017-02-15 | 天津大学 | Quick direct current system protection scheme based on voltage source type current converter |
| CN104467393A (en) * | 2015-01-04 | 2015-03-25 | 南京南瑞继保电气有限公司 | Device for preventing sub-module capacitor overvoltage |
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| CN104820157B (en) * | 2015-04-30 | 2018-08-07 | 国家电网公司 | A kind of flexible direct current power transmission system direct current monopolar grounding fault judgment method |
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| CN105449650B (en) * | 2016-01-25 | 2018-09-11 | 云南电网有限责任公司电力科学研究院 | A kind of protection system and method for flexible direct current intelligence transmission and distribution network |
| CN106571620B (en) * | 2016-10-12 | 2019-01-18 | 南方电网科学研究院有限责任公司 | Fault determination method for direct-current line grounding short circuit of double-end flexible direct-current power transmission system |
| CN109061420A (en) * | 2018-08-28 | 2018-12-21 | 南京南瑞继保电气有限公司 | A kind of spark gap test macro |
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| CN112968462B (en) * | 2021-02-20 | 2022-11-22 | 国网冀北电力有限公司检修分公司 | Converter station overvoltage control method, pole control system and overvoltage control system |
| CN113013860B (en) * | 2021-03-29 | 2024-02-06 | 西安西电电力系统有限公司 | Converter valve overvoltage suppression method and device |
| CN113346453A (en) * | 2021-07-20 | 2021-09-03 | 江苏致能杰能源科技有限公司 | Direct current conduction protection circuit with overvoltage protection |
| CN113794220B (en) * | 2021-09-02 | 2024-04-02 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Overvoltage protection method, overvoltage protection device, computer equipment and storage medium |
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| CN102130441A (en) * | 2011-03-16 | 2011-07-20 | 中国电力科学研究院 | Protection configuration method of flexible direct-current (DC) transmission system of modular multiple-level converter |
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| CN103296671A (en) | 2013-09-11 |
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