CN109193581A - Consider the transmission line distance protecting method of static synchronous series compensator access - Google Patents
Consider the transmission line distance protecting method of static synchronous series compensator access Download PDFInfo
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- CN109193581A CN109193581A CN201811087971.9A CN201811087971A CN109193581A CN 109193581 A CN109193581 A CN 109193581A CN 201811087971 A CN201811087971 A CN 201811087971A CN 109193581 A CN109193581 A CN 109193581A
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- protection
- impedance
- transmission line
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- distance
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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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
Abstract
The invention discloses a kind of transmission line distance protecting methods of consideration static synchronous series compensator access, including the following steps carried out in order: 1) calculating the measurement impedance Z of transmission line of electricity after access static synchronous series compensatorm；2) need to transmission line of electricity to be protected be divided into three sections, every section is provided with impedance relay, respectively Z1、Z2、Z3；Calculate three sections of distance protection setting value, respectively Zset1、Zset2、Zset3；3) judgement measurement impedance ZmWith three sections of setting valve Zset1、Zset2、Zset3It is compared and makes corresponding protection act.Compared with prior art; the transmission line distance protecting method of consideration static synchronous series compensator access considers the three-stage distance protection of static synchronous series compensator access; pass through the mutual cooperation of setting valve and operation time limit; it realizes route protection main protection and back-up protection function, guarantees the selectivity of protection act.
Description
Technical field
The present invention relates to reactive compensation and technical field of relay protection, in particular to a kind of consideration Static Synchronous Series compensation
The transmission line distance protecting method of device access.
Background technique
Static synchronous series compensator (Static Sychronous Series Compensator, hereinafter referred to as SSSC)
It is a kind of voltage source converter technology based on turn-off device, can be equivalent to the synchronous voltage source of series connection in the line, pass through
Injection one is orthogonal with line current, voltage source that amplitude is controllable changes the equipment of the equivalent impedance of transmission line of electricity.
SSSC is the synchronous voltage source controller constituted using full-controlled device, it is mainly by inverter, controller and system
Access device composition, for transmission system, since line current grade is relatively high, static synchronous series compensator is usually to pass through
Series transformer is linked into system.Schematic illustration is as shown in Figure 1.
In recent years, China's economic development is rapid, and electricity needs constantly rises, and flexible AC transmitting system (FACTS) is more next
It is more taken seriously, static synchronous series compensator (SSSC) is used as a new generation's FACTS equipment, can not change original power grid knot
Under the premise of structure, the transmittability of route is effectively improved, there are more wide application prospects and development space.
Static synchronous series compensator injects a voltage source orthogonal with line current, amplitude is controllable, thus can change
The voltage landing of route has an impact traditional distance protection.Traditional distance protection is by line voltage distribution and electric current
Calculating, obtain fault point to protection the distance between infield (or impedance), and movement is determined according to the distance of distance
Time.Because the access of SSSC causes the voltage of route to change, distance protection function will be affected, and lead to fault distinguishing
Failure, will seriously affect the safe operation of route.
Summary of the invention
The object of the present invention is to provide a kind of transmission line distance protecting sides of consideration static synchronous series compensator access
Method.
For this purpose, technical solution of the present invention is as follows:
A kind of transmission line distance protecting method considering static synchronous series compensator access, including what is carried out in order
The following steps:
1) the measurement impedance Z of transmission line of electricity after accessing static synchronous series compensator is calculatedm；
2) need to transmission line of electricity to be protected be divided into three sections, every section is provided with impedance relay, respectively Z1、Z2、Z3；
The Ith section of line impedance is calculated, set distance protects I section of setting valve Zset1It is the 80%~85% of the line impedance of first segment,
I.e. the distance protection can protect the 80%~85% of I section of route；Calculate the IIth section of route distance protection setting value Zset2, should be away from
It can protect I section of overall length and II section of overall length, the main protection of the I, the II section of protection structure route protection from protection；Calculate III
Section route distance protection setting value Zset3, which is adjusted by route maximum load current, the back-up protection as route protection；
3) impedance Z will be measuredmWith three sections of setting valve Zset1、Zset2、Zset3It is compared；Work as Zm> Zset1,2,3When, transmission of electricity
Route operates normally, impedance relay Z1、Z2、Z3Do not start, protection is failure to actuate；Work as Zm< Zset1When, impedance relay Z1、
Z2、Z3Start, Z1Through time-delay relay t1After export, Z2、Z3It returns, protection act；Work as Zset1< Zm< Zset2When, impedance after
Electric appliance Z2、Z3Starting, Z1Do not start, Z2Through time-delay relay t2After export, Z3It returns, protection act；Work as Zset2< Zm< Zset3
When, impedance relay Z3Starting, Z1、Z2Do not start, Z3Through time-delay relay t3After export, protection act.
Further, the measurement impedance ZmCalculation method are as follows:
Zm=(Um-|ΔU|)/Im
Wherein UmFor the input voltage of traditional distance protection, Δ U is that the control valve of static synchronous series compensator exports electricity
Pressure, ImFor input current.
Compared with prior art, the transmission line distance protecting method of consideration static synchronous series compensator access can root
According to static synchronous series compensator operating status, by static synchronous series compensator access adjust the distance protection influence consider away from
During protection impedance measuring, to eliminate influence of the static synchronous series compensator to traditional distance protection, realize
The correct movement of route distance protection.The three-stage distance protection for considering static synchronous series compensator access, passes through setting valve
With the mutual cooperation of operation time limit, realizes route protection main protection and back-up protection function, guarantee the selectivity of protection act.
Detailed description of the invention
Fig. 1 is the schematic illustration of static synchronous series compensator.
The position Fig. 2 three-stage protection range of the present invention and operation time limit cooperate schematic diagram.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is described further, but following embodiments are absolutely not to this hair
It is bright to have any restrictions.
A kind of transmission line distance protecting method considering static synchronous series compensator access, including what is carried out in order
The following steps:
1) the measurement impedance Z of transmission line of electricity after accessing static synchronous series compensator is calculatedm；
2) as shown in Fig. 2, need to transmission line of electricity to be protected be divided into three sections, every section is provided with impedance relay, respectively
For Z1、Z2、Z3；The Ith section of line impedance is calculated, set distance protects I section of setting valve Zset1For the line impedance of first segment
80%~85%, i.e. the distance protection can protect the 80%~85% of I section of route；Calculate the IIth section of route distance protection setting
Value Zset2, which can protect I section of overall length and II section of overall length, the master of the I, the II section of protection structure route protection
Protection；Calculate III section of route distance protection setting value Zset3, which is adjusted by route maximum load current, as route protection
Back-up protection；
3) judgement measurement impedance ZmWith three sections of setting valve Zset1、Zset2、Zset3It is compared；Work as Zm> Zset1,2,3When, it is defeated
Electric line operates normally, impedance relay Z1、Z2、Z3Do not start, protection is failure to actuate；Work as Zm< Zset1When, impedance relay Z1、
Z2、Z3Start, Z1Through time-delay relay t1After export, Z2、Z3It returns, protection act；Work as Zset1< Zm< Zset2When, impedance after
Electric appliance Z2、Z3Starting, Z1Do not start, Z2Through time-delay relay t2After export, Z3It returns, protection act；Work as Zset2< Zm< Zset3
When, impedance relay Z3Starting, Z1、Z2Do not start, Z3Through time-delay relay t3After export, protection act.
Preferably, the measurement impedance ZmCalculation method are as follows:
Zm=(Um-|ΔU|)/Im
Wherein UmFor the input voltage of traditional distance protection, Δ U is that the control valve of static synchronous series compensator exports electricity
Pressure, ImFor input current.
Claims (2)
1. a kind of transmission line distance protecting method for considering static synchronous series compensator access, which is characterized in that including pressing
The following steps that sequence carries out:
1) the measurement impedance Z of transmission line of electricity after accessing static synchronous series compensator is calculatedm；
2) need to transmission line of electricity to be protected be divided into three sections, every section is provided with impedance relay, respectively Z1、Z2、Z3；It calculates
Ith section of line impedance, set distance protect I section of setting valve Zset1It is the 80%~85% of the line impedance of first segment, i.e., should
Distance protection can protect the 80%~85% of I section of route；Calculate the IIth section of route distance protection setting value Zset2, distance guarantor
Shield can protect I section of overall length and II section of overall length, the main protection of the I, the II section of protection structure route protection；Calculate III section of line
Road distance protection setting value Zset3, which is adjusted by route maximum load current, the back-up protection as route protection；
3) impedance Z will be measuredmWith three sections of setting valve Zset1、Zset2、Zset3It is compared；Work as Zm> Zset1,2,3When, transmission line of electricity
It operates normally, impedance relay Z1、Z2、Z3Do not start, protection is failure to actuate；Work as Zm< Zset1When, impedance relay Z1、Z2、Z3?
Starting, Z1Through time-delay relay t1After export, Z2、Z3It returns, protection act；Work as Zset1< Zm< Zset2When, impedance relay Z2、
Z3Starting, Z1Do not start, Z2Through time-delay relay t2After export, Z3It returns, protection act；Work as Zset2< Zm< Zset3When, impedance after
Electric appliance Z3Starting, Z1、Z2Do not start, Z3Through time-delay relay t3After export, protection act.
2. transmission line distance protecting method according to claim 1, which is characterized in that the measurement impedance ZmCalculating
Method are as follows:
Zm=(Um-|ΔU|)/Im
Wherein UmFor the input voltage of traditional distance protection, Δ U is the control valve output voltage of static synchronous series compensator, Im
For input current.
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| CN201811087971.9A CN109193581A (en) | 2018-09-18 | 2018-09-18 | Consider the transmission line distance protecting method of static synchronous series compensator access |
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| CN201811087971.9A CN109193581A (en) | 2018-09-18 | 2018-09-18 | Consider the transmission line distance protecting method of static synchronous series compensator access |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300341A (en) * | 2021-06-11 | 2021-08-24 | 国网山东省电力公司莱芜供电公司 | Distance protection method based on static synchronous compensator |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104134968A (en) * | 2014-08-05 | 2014-11-05 | 南京南瑞继保电气有限公司 | Protection method and system for unified power flow controller |
| CN106786428A (en) * | 2017-02-28 | 2017-05-31 | 全球能源互联网研究院 | A kind of transmission line distance protecting method and device containing SSSC |
| CN108199358A (en) * | 2018-01-24 | 2018-06-22 | 中国电力科学研究院有限公司 | The distance protecting method and system of a kind of transmission line of electricity containing THE UPFC |
| WO2018145746A1 (en) * | 2017-02-09 | 2018-08-16 | Rabb Schweiz Ag | High-voltage power electronic building block design |
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2018
- 2018-09-18 CN CN201811087971.9A patent/CN109193581A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104134968A (en) * | 2014-08-05 | 2014-11-05 | 南京南瑞继保电气有限公司 | Protection method and system for unified power flow controller |
| WO2018145746A1 (en) * | 2017-02-09 | 2018-08-16 | Rabb Schweiz Ag | High-voltage power electronic building block design |
| CN106786428A (en) * | 2017-02-28 | 2017-05-31 | 全球能源互联网研究院 | A kind of transmission line distance protecting method and device containing SSSC |
| CN108199358A (en) * | 2018-01-24 | 2018-06-22 | 中国电力科学研究院有限公司 | The distance protecting method and system of a kind of transmission line of electricity containing THE UPFC |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300341A (en) * | 2021-06-11 | 2021-08-24 | 国网山东省电力公司莱芜供电公司 | Distance protection method based on static synchronous compensator |
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Application publication date: 20190111 |