CN104134968B - Protection method and system for unified power flow controller - Google Patents
Protection method and system for unified power flow controller Download PDFInfo
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- CN104134968B CN104134968B CN201410382299.1A CN201410382299A CN104134968B CN 104134968 B CN104134968 B CN 104134968B CN 201410382299 A CN201410382299 A CN 201410382299A CN 104134968 B CN104134968 B CN 104134968B
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Abstract
The invention provides a protection method and system for a unified power flow controller. The partitioning and layering method is adopted and includes the steps that the unified power flow controller is firstly partitioned according to the number of current converters; partition protection is carried out on each current converter area according to an alternating current protection area, a converter valve protection area and a direct current pole protection area; meanwhile, layered protection is carried out on the converter valve areas according to a converter valve layer and a valve element layer. The protection system is characterized in that according to the characteristic that a series connection side transformer is connected into a line in series, a PT is additionally arranged on the line to enable a series connection transformer primary winding to be arranged between the PT and a CT of an original line, a series connection transformer line side winding is brought into a line protection range, and meanwhile the additionally-arranged line PT is adopted for line protection. The protection method and system are simple and reliable, all areas of a UPFC device are covered, UPFC protection is matched with original alternating current system protection, the protected ranges are intersected, it is guaranteed that protected dead zones do not exist, and the motion reliability of the integral system is improved.
Description
Technical field
The invention belongs to flexible transmission field in power system, and in particular to a kind of guard method of THE UPFC
And system.
Background technology
With the interconnection and the use of various new equipments of large-scale power system, making, generating, transmission of electricity are more economical, more efficient
While also increase the scale and complexity of power system；Along with substantial amounts of distributed generation system accesses electrical network, biography is made
The fixation of system is occurred reverse from the trend that power transmission network is transmitted to power distribution network；The continuous growth of customer charge needs power flowcontrol means
Improve existing power delivering capability；Power Exchange complicated between booming intelligent grid and electricity market needs frequency
Numerous optimal power flow control.
THE UPFC, also known as UPFC (Unified Power Flow Controller), is general so far
The best tidal current controller of property, simplest UPFC are connected by direct current common port by two identical voltage source converters
Connect, can be regarded as a STATCOM (STATCOM) and SSSC (SSSC) parallel connection structure
Into, only by change control law, be able to or while and rapidly realize the differences such as shunt compensation, series compensation and phase shift
Control function, improve power system performance.
As shown in figure 1, in figure, 1 is shunt transformer for the basic structure of UPFC, and 2 is back-to-back voltage source converter, 3
For series transformer, 4 is controlled alternating current circuit.UPFC includes side inverter in parallel, series side inverter, side transformer in parallel,
Series connection side transformer, side transformer service entrance switch in parallel, series connection side transformer by-pass switch etc.；Which can realize exchanging grid entry point
The multiple target such as voltage or Reactive Power Control, line termination voltage control, phase shifting control, impedance control, direct power flowcontrol is assisted
Regulation and control system；As its structure is compared, other flexible transmission devices are more complicated, need detailed and reliable Preservation tactics and set ensureing which
The safety of standby and power system, improves the efficiency of THE UPFC；For the UPFC using different topology inverter, its guarantor
Shield strategy is also different.
At present, the country has development on the access of UPFC on the research in terms of harmonics impact, but without pertinent literature
Report relevant UPFC Preservation tactics and defencive function configuration.Appoint virtuous " THE UPFC and its impact to relay protection "
(North China Electric Power University's Master's thesis, 2005,12), mainly have studied impact of the UPFC harmonic waves to relay protection, analyze symmetrical
Under the conditions of unbalanced fault, UPFC adjusts the distance the impact of protection, it is proposed that reducing UPFC affects the phase taken to relay protection
Answer adjustable strategies and measure；" impact of THE UPFC and its protection of adjusting the distance " (the North China Electric Power University master of Zhang Yong
Paper, 2005,1), stable state is analyzed with UPFC under fault condition to the impedor impact of circuit distance protection, by offline
Simulated program carried out UPFC adjust the distance protection affect simulation study, it is proposed that the corresponding adjustment plan that distance protection should be taken
Omit and method.
Wang Ruxi et al. " adaptive distance protection containing THE UPFC circuit is studied " (electrician electrically, 2011,
8,18～22), by analyze malfunction under UPFC to measure impedance impact, it is proposed that the adaptive guard of ground short circuit and
Two kinds of solutions of phase fault adaptive guard, overcome the tradition when the back end of line containing UPFC devices occurs line fault
The impact of the possible tripping of distance protection so that distance protection can correctly reflect each short trouble.
The analysis of above-mentioned document only accounts for impacts of the UPFC to circuit distance protection, does not account for other such as circuits
The impact of differential protection and directional element etc., the protection of protection and original AC system without reference to UPFC equipment of itself
With the cooperation of UPFC autoprotections；The side in parallel of UPFC is considered into by above-mentioned document when analysis UPFC adjusts the distance protection impact
It is connected in parallel on circuit, such that impacts of the UPFC to route protection becomes complicated, and during practical engineering application, it is contemplated that
The convenience and reasonability of its wiring, can be by the bus of side joint in parallel to alternating current circuit, as a branch of ac bus, its
Impact to harmonics can it is less, and control effect is the same；On the other hand, above-mentioned document keeps former protection after UPFC accesses
Sampled point it is constant, so can also cause the fixed value adjusting of protection to become complicated, be not suitable for engineer applied, need to protection sampling
Point is optimized.
The characteristics of in order to give full play to THE UPFC tide optimization, the safety of its equipment and power system is protected,
The fast development of THE UPFC application is promoted, needs one kind is more reliable, it is less that harmonics are affected, be more suitable for engineering
Using THE UPFC guard method and system.
The content of the invention
The purpose of the present invention, is the relaying configuration method and system for providing a kind of THE UPFC, simple and practical,
Reliability is high, can protect the safety of THE UPFC main equipment and power system, while Unified Power Flow control can be reduced
The impact that the access of device processed is protected to original AC system, is suitable for engineer applied.
In order to achieve the above object, solution of the invention is：
A kind of guard method of THE UPFC, the guard method according to inverter quantity to side inverter in parallel and
Series side inverter subregion is protected；Described converter unit protection area in side in parallel and series side converter unit protection area are according to exchanging
Protection zone, converter valve protection zone and direct current pole protection zone subregion are protected；Press change of current valve layer and valve in the converter valve protection zone
Elementary layer carries out layered protection；
The guard method of above-mentioned THE UPFC, for the unified tide using modular multilevel structure inverter
Stream controller, the converter valve area protection carry out layered protection by submodule floor, bridge arm valve layer and change of current valve layer.
A kind of protection system of THE UPFC, the protection system are made up of N number of converter unit protection subsystem, N etc.
In the inverter total number of THE UPFC, N is natural number, and N is more than 1；The converter unit protection subsystem is included simultaneously
Connection two class of side converter unit protection subsystem and series side converter unit protection subsystem；
The protection system of above-mentioned THE UPFC, its converter unit protection subsystem in side in parallel and series side inverter
Protected subsystem includes exchanging area protection location, converter valve area protection location and direct current polar region protection location；The converter valve
Area's protection location includes change of current valve layer protection subelement and converter valve elementary layer protection subelement；
The protection system of above-mentioned THE UPFC, increases configuration one on series transformer connects the circuit for accessing
Individual voltage transformer pt, makes the line side winding of series transformer between the PT and former line current transformer CT；
The protection system of above-mentioned THE UPFC, the voltage transformer pt on the described circuit for newly increasing is made
The PT used by former AC system route protection module samples；By the module of the AC line protection, the former circuit of protection
And the transformer wire trackside windings section being serially accessed to the circuit；Keep the protection domain of former AC system bus protection module constant,
Intersect with the protection domain of former AC system route protection module, it is ensured that alternating current circuit region unprotect dead band.
The protection system of above-mentioned THE UPFC, for the unified tide using modular multilevel structure inverter
Stream controller, converter valve area protection location include submodule floor protection subelement, bridge arm valve layer protection subelement and the change of current
Valve layer protects subelement；
The exchanging area protection location of above-mentioned converter unit protection subsystem in side in parallel is included but is not limited to：Alternating voltage exception
Protection module, AC system frequency abnormal protection module and shunt transformer protection subelement；
The converter valve area protection location of above-mentioned converter unit protection subsystem in side in parallel is included but is not limited to：Inverter is exchanged
Bus differential protecting module, inverter overcurrent protection module, converter reactor differential protection module and valve differential protection module；
The direct current polar region protection location of above-mentioned converter unit protection subsystem in side in parallel is included but is not limited to：Unidirectional current reduce off-flavor
Normal protection module and the under-voltage overcurrent protection module of direct current.
The exchanging area protection location of above-mentioned series side converter unit protection subsystem is included but is not limited to：Line voltage distribution exception
Protection module and series transformer protection subelement；
The converter valve area protection location of above-mentioned series side converter unit protection subsystem is included but is not limited to：Inverter is exchanged
Bus differential protecting module, inverter overcurrent protection module, converter reactor differential protection module, valve differential protection module；
The direct current polar region protection location of above-mentioned series side converter unit protection subsystem is included but is not limited to：Unidirectional current reduce off-flavor
Normal protection module and the under-voltage overcurrent protection module of direct current.
Above-mentioned protection system is tapped into the structure of AC system bus suitable for UPFC parallel connection sidepieces.
After using such scheme, the guard method of THE UPFC of the present invention and system can protect Unified Power Flow control
Device main equipment processed and the safety of power system, preferably play the advantage that THE UPFC optimizes system load flow；Its method
It is simple and reliable, cover all regions of THE UPFC equipment, and by THE UPFC autoprotection with it is original
AC system protection cooperates, and protection domain intersects, it is ensured that unprotect dead band, is adapted to engineer applied.THE UPFC
It is a kind of flexible AC transmission equipment of compound, many control targes, its complex structure, conjunction of the present invention from practical engineering application
Rationality angle considers that the actual meeting of side system in parallel is simultaneously connected on the bus of circuit, rather than be directly attempted by circuit, is so subtracted
Little UPFC accesses the impact to route protection；And by being carried out Sub-region and hierarchical control so that its relaying configuration is apparent,
Simply；In addition, the present invention reduces the access of THE UPFC by increasing by one voltage measurement point of configuration on the line
The impact caused by the protection of original AC system.The present disclosure applies equally to tide between SSSC (SSSC), line
The relaying configuration of stream controller (IPFC) and CSC (convertible static compensator).
Description of the drawings
Fig. 1 is the basic structure isoboles of THE UPFC；
Fig. 2 is the THE UPFC basic structure isoboles after the optimization side mode of connection in parallel；
Fig. 3 is the structure chart of THE UPFC protection zone configuration in the present invention；
Fig. 4 is the structure chart that THE UPFC is engaged with former AC system protection in the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is described in detail.
The basic structure isoboles of THE UPFC is as shown in figure 1,1 being shunt transformer, 2 being voltage source converter
Device, 3 be series transformer, 4 be alternating current circuit equivalent reactance.Structure as shown in Figure 1, when being unfavorable for engineer applied, side in parallel connects
Line, and impact of this connection to AC line protection is than larger；For ease of engineer applied, can be by THE UPFC
Side joint in parallel enters ac bus, reduces the impact to route protection, as shown in Fig. 2 the structure is equivalent with structure shown in Fig. 1, control
Effect processed is the same.
The present invention is based on structure shown in Fig. 2, there is provided a kind of guard method of THE UPFC and system, such as Fig. 3 institutes
Show, by THE UPFC elder generation subregion, layering and zoning is protected again, and the collocation method covers all areas of UPFC equipment
Domain, while cooperating with original harmonics, protection domain intersects, it is ensured that unprotect dead band.
A kind of guard method of THE UPFC, the guard method according to inverter quantity to side inverter in parallel and
Series side inverter subregion is protected；Described converter unit protection area in side in parallel is according to harmonics area 1, converter valve protection zone
2 and 3 subregion of direct current pole protection zone protected；Described series side converter unit protection area is protected according to harmonics area 4, converter valve
Shield area 5 and 6 subregion of direct current pole protection zone are protected；Converter valve area in the side in parallel protection 2, and series side converter valve area protection
5 carry out layered protection by change of current valve layer and valve cell layer；
The guard method of aforesaid THE UPFC, for the unified tide using modular multilevel structure inverter
Stream controller, converter valve area in the side in parallel protection 2, and series side converter valve area protection 5 press submodule floor, bridge arm valve layer and
Change of current valve layer carries out layered protection.
A kind of protection system of THE UPFC, the protection system are made up of N number of converter unit protection subsystem, N etc.
In the inverter total number of THE UPFC, N is natural number, and N is more than 1；The converter unit protection subsystem is included simultaneously
Connection two class of side converter unit protection subsystem and series side converter unit protection subsystem；
The protection system of aforesaid THE UPFC, its converter unit protection subsystem in side in parallel and series side inverter
Protected subsystem includes exchanging area protection location, converter valve area protection location and direct current polar region protection location；The converter valve
Area's protection location includes change of current valve layer protection subelement and converter valve elementary layer protection subelement；
As shown in figure 4, the protection system of aforesaid THE UPFC, connects on the circuit for accessing in series transformer
Increase by one voltage transformer 3 of configuration, make the line side winding of series transformer mutual in the voltage transformer 3 and former line current
Between sensor 1,；2 is the voltage transformer installed on bus, is used by former route protection module samples；
The protection system of aforesaid THE UPFC, the voltage transformer 3 on the described circuit for newly increasing is made
The voltage transformer used by former AC system route protection module samples；By the module of the AC line protection, protect
The former circuit of shield and the transformer wire trackside windings section being serially accessed to the circuit；Keep the protection model of former AC system bus protection module
Enclose constant, intersect with the protection domain of former AC system route protection module, it is ensured that alternating current circuit region unprotect dead band.
The protection system of aforesaid THE UPFC, for the unified tide using modular multilevel structure inverter
Stream controller, converter valve area protection location include submodule floor protection subelement, bridge arm valve layer protection subelement and the change of current
Valve layer protects subelement；
The exchanging area protection location of aforesaid converter unit protection subsystem in side in parallel is included but is not limited to：Alternating voltage exception
Protection module, AC system frequency abnormal protection module and shunt transformer protection subelement；
The converter valve area protection location of aforesaid converter unit protection subsystem in side in parallel is included but is not limited to：Inverter is exchanged
Bus differential protecting module, inverter overcurrent protection module, converter reactor differential protection module and valve differential protection module；
The direct current polar region protection location of aforesaid converter unit protection subsystem in side in parallel is included but is not limited to：Unidirectional current reduce off-flavor
Normal protection module and the under-voltage overcurrent protection module of direct current.
The exchanging area protection location of aforesaid series side converter unit protection subsystem is included but is not limited to：Line voltage distribution exception
Protection module and series transformer protection subelement；
The converter valve area protection location of aforesaid series side converter unit protection subsystem is included but is not limited to：Inverter is exchanged
Bus differential protecting module, inverter overcurrent protection module, converter reactor differential protection module, valve differential protection module；
The direct current polar region protection location of aforesaid series side converter unit protection subsystem is included but is not limited to：Unidirectional current reduce off-flavor
Normal protection module and the under-voltage overcurrent protection module of direct current.
The present invention introduces embodiment, but this by taking some the basic defencive functions suitable for THE UPFC as an example
The guard method of invention and system are not limited to above-mentioned defencive function, for comprising other defencive functions or not adopting above-mentioned portion
The THE UPFC of code insurance protective function, flow controller and convertible static benefit between SSSC, line
The guard method and system for repaying device is all suitable for.It is any to involve using being carried out subregion, carried out the system of layering and zoning again by inverter
One flow controller guard method and system are belonged within the scope of the invention.
Finally it should be noted that：Technical scheme is illustrated only rather than a limitation with reference to above-described embodiment.Institute
The those of ordinary skill in category field is to be understood that：Those skilled in the art can be repaiied to the specific embodiment of the present invention
Change or equivalent, but these modifications or change are being applied within pending patent requirements protection domain.
Claims (10)
1. a kind of protection system of THE UPFC, it is characterised in that the protection system is by N number of converter unit protection subsystem
System is constituted, and N is equal to the inverter total number of THE UPFC, and N is natural number, and N is more than 1；Converter unit protection
System includes two class of converter unit protection subsystem in side in parallel and series side converter unit protection subsystem；
The protection system is additionally included on the circuit that series transformer series connection is accessed increases by one voltage transformer pt of configuration, makes
The line side winding of series transformer is between the PT and former line current transformer CT；
The protection system is using the voltage transformer pt on the described circuit for newly increasing as former AC system route protection mould
The used PT of block sampling；By the former AC system route protection module, protection original circuit and the transformation being serially accessed to the circuit
Device line side windings section；Keep the protection domain of former AC system bus protection module constant, protect with former AC system circuit
The protection domain of shield module intersects, it is ensured that alternating current circuit region unprotect dead band.
2. a kind of protection system of THE UPFC as claimed in claim 1, it is characterised in that the side change of current in parallel
Device protected subsystem and series side converter unit protection subsystem include exchanging area protection location, converter valve area protection location and straight
Stream polar region protection location；Converter valve area protection location includes change of current valve layer protection subelement and converter valve elementary layer protection
Unit.
3. a kind of protection system of THE UPFC as claimed in claim 2, it is characterised in that for adopting modularity
The THE UPFC of many level block inverters, converter valve area protection location include submodule floor protection subelement,
Bridge arm valve layer protects subelement and change of current valve layer protection subelement.
4. the protection system of THE UPFC as claimed in claim 2, it is characterised in that the side inverter in parallel is protected
The exchanging area protection location of shield subsystem includes：Alternating voltage abnormal protection module, AC system frequency abnormal protection module and
Shunt transformer protects subelement.
5. the protection system of THE UPFC as claimed in claim 2, it is characterised in that the side in parallel or series side
The converter valve area protection location of converter unit protection subsystem includes：Inverter ac bus differential protection module, inverter excessively stream
Protection module, converter reactor differential protection module and valve differential protection module.
6. the protection system of THE UPFC as claimed in claim 2, it is characterised in that the side in parallel or series side
The direct current polar region protection location of converter unit protection subsystem includes：DC voltage abnormal protection module and the under-voltage overcurrent protection of direct current
Module.
7. the protection system of THE UPFC as claimed in claim 2, it is characterised in that the series side inverter is protected
The exchanging area protection location of shield subsystem includes：Line voltage distribution abnormal protection module and series transformer protection subelement.
8. a kind of protection system of THE UPFC as claimed in claim 1, it is characterised in that the protection system is fitted
The structure of AC system bus is tapped into for UPFC parallel connection sidepieces.
9. a kind of guard method of THE UPFC, it is characterised in that methods described based on protection system by N number of change of current
Device protected subsystem is constituted, and N is equal to the inverter total number of THE UPFC, and N is natural number, and N is more than 1；It is described to change
Stream device protected subsystem includes two class of converter unit protection subsystem in side in parallel and series side converter unit protection subsystem；
The protection system is additionally included on the circuit that series transformer series connection is accessed increases by one voltage transformer pt of configuration, makes
The line side winding of series transformer is between the PT and former line current transformer CT；
The protection system is using the voltage transformer pt on the described circuit for newly increasing as former AC system route protection mould
The used PT of block sampling；By the former AC system route protection module, protection original circuit and the transformation being serially accessed to the circuit
Device line side windings section；Keep the protection domain of former AC system bus protection module constant, protect with former AC system circuit
The protection domain of shield module intersects, it is ensured that alternating current circuit region unprotect dead band；
Methods described is protected to side inverter in parallel and series side inverter subregion according to inverter quantity；Described parallel connection
Side converter unit protection area and series side converter unit protection area are distinguished according to the protection of harmonics area, converter valve protection zone and direct current pole
Protected in area；The converter valve protection zone carries out layered protection by change of current valve layer and valve cell layer.
10. the guard method of THE UPFC as claimed in claim 9, it is characterised in that many for using modularity
The THE UPFC of level block inverter, the converter valve protection zone press submodule layer, bridge arm valve layer and change of current valve layer
Carry out layered protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410382299.1A CN104134968B (en) | 2014-08-05 | 2014-08-05 | Protection method and system for unified power flow controller |
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| CN201410382299.1A CN104134968B (en) | 2014-08-05 | 2014-08-05 | Protection method and system for unified power flow controller |
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| CN104134968B true CN104134968B (en) | 2017-04-12 |
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| CN105186840B (en) * | 2015-08-31 | 2017-07-14 | 国家电网公司 | UPFC harmonic suppressing methods based on reduction submodule capacitor voltage |
| CN105207208B (en) * | 2015-09-21 | 2018-07-06 | 山东科汇电力自动化股份有限公司 | Realize power flowcontrol and the circuit of small current grounding fault active compensation extinguishing arc simultaneously |
| CN105552916B (en) * | 2015-12-17 | 2018-04-10 | 江苏省电力公司电力经济技术研究院 | A kind of system-level control methods of UPFC with the out-of-limit control function of line power |
| CN106207996B (en) * | 2016-08-24 | 2018-06-19 | 国网江苏省电力公司电力科学研究院 | THE UPFC series transformer charge initiation tests relaying configuration method |
| CN106549383B (en) * | 2016-10-31 | 2019-07-02 | 全球能源互联网研究院有限公司 | A kind of control system and THE UPFC of THE UPFC |
| CN106786428B (en) * | 2017-02-28 | 2019-03-22 | 全球能源互联网研究院 | A kind of transmission line distance protecting method and device containing SSSC |
| CN106911132B (en) * | 2017-04-27 | 2019-07-02 | 武汉理工大学 | The control system and modeling method of Distributed Power Flow controller based on MMC |
| CN107104420B (en) * | 2017-05-22 | 2018-12-18 | 华北电力大学 | I segment protection method of route distance suitable for THE UPFC access |
| CN107086549B (en) * | 2017-05-22 | 2018-12-18 | 华北电力大学 | I segment protection method of distance of UPFC line attachment single-phase grounding fault |
| CN107994584A (en) * | 2017-11-28 | 2018-05-04 | 国网江苏省电力有限公司经济技术研究院 | A kind of major loop wiring construction of compensator |
| CN108365597B (en) * | 2018-01-29 | 2021-11-26 | 中国电力科学研究院有限公司 | Interturn fault diagnosis method and system for series transformer after thyristor bypass switch is quickly closed |
| CN108321775A (en) * | 2018-01-30 | 2018-07-24 | 国网上海市电力公司 | The mating protection method of UPFC devices and electric system |
| CN109193581A (en) * | 2018-09-18 | 2019-01-11 | 国网天津市电力公司 | Consider the transmission line distance protecting method of static synchronous series compensator access |
| CN109066586B (en) * | 2018-09-19 | 2020-03-20 | 南京南瑞继保电气有限公司 | Longitudinal zero-sequence differential protection method and device for magnetically balanced series transformer |
| CN109193959A (en) * | 2018-09-21 | 2019-01-11 | 全球能源互联网研究院有限公司 | It takes energy Current Transformer and takes the Static Synchronous Series compensation device of energy using it |
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