CN107069683B - A kind of method and apparatus for eliminating influence of the compensator to route distance protection - Google Patents

A kind of method and apparatus for eliminating influence of the compensator to route distance protection Download PDF

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Publication number
CN107069683B
CN107069683B CN201710386324.7A CN201710386324A CN107069683B CN 107069683 B CN107069683 B CN 107069683B CN 201710386324 A CN201710386324 A CN 201710386324A CN 107069683 B CN107069683 B CN 107069683B
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China
Prior art keywords
compensator
route
access
series
voltage
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CN107069683A (en
Inventor
潘磊
田杰
董云龙
卢宇
黄如海
姜崇学
鲁江
张宝顺
邱德锋
谢华
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NR Electric Co Ltd
NR Engineering Co Ltd
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NR Electric Co Ltd
NR Engineering Co Ltd
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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
    • H02H7/261—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 involving signal transmission between at least two stations
    • H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders
    • 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
    • H02H7/261—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 involving signal transmission between at least two stations
    • H02H7/263—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 involving signal transmission between at least two stations involving transmissions of measured values

Abstract

A kind of method of influence the embodiment of the invention discloses elimination compensator to route distance protection; the described method includes: obtaining the electric current of the series connection inverter in compensator or the route of compensator access; when the electric current is greater than the predetermined current threshold; and first the duration be greater than the first preset time threshold, exit the series connection inverter and the series transformer；Or when the electric current is unsatisfactory for above-mentioned requirements, obtain the voltage of the bus of the compensator access or the route of compensator access, when the voltage is less than or equal to the predetermined voltage threshold, and second the duration be greater than the second preset time threshold, exit the series connection inverter and the series transformer.The embodiment of the present invention also discloses a kind of device of influence of the elimination compensator to route distance protection simultaneously.

Description

A kind of method and apparatus for eliminating influence of the compensator to route distance protection
Technical field
The present invention relates to the elimination power electronic equipment in field of power system adjust the distance protection circuit influence technology, especially It is related to a kind of method and apparatus of influence of the elimination compensator to route distance protection.
Background technique
With the fast development of the interconnection technique of electric system, the electric system of long distance power transmission has obtained widely answering With.During remote Operation of Electric Systems, it is easy to be influenced by factors such as environment, workload demands, system shake occurs The problem of swinging, the performances such as system stability contorting performance, alternating current-direct current mixing electric network coordination, power flowcontrol ability caused to decline.It is existing Using static synchronous series compensator (Static Synchronous Series Compensator, SSSC), uniformly in technology Flow controller (Interline between flow controller (Unified Power Flow Controller, UPFC) and line Power Flow Controller, IPFC), the equipment such as convertible static compensator solve above-mentioned technical problem.
Currently, the access for static synchronous series compensator or UPFC influences aspect to harmonics in the prior art Document has: " THE UPFC and its influence to relay protection ", " THE UPFC and its shadow for protection of adjusting the distance Ring ", the adaptive distance protection of the route containing THE UPFC " study ", patent document has: application number CN201510732288.6 and a kind of entitled distance protecting method for the transmission line of electricity containing THE UPFC, Application number CN201610309848.1 and the entitled rapid distance protection method for power transmission line containing UPFC and device, application Number CN201510371762.7 and a kind of entitled electricity with THE UPFC transmission line of electricity based on pattern-recognition Flow transient direction protection method, application number CN201510371647.X and entitled a kind of with THE UPFC The method for protecting transient state energy of transmission line of electricity.
But above-mentioned existing literature mainly according to the working principle of SSSC, UPFC, IPFC or convertible static compensator and Characteristic optimizes the defencive function of the line protective device of route distance protection, but does not consider to work as electric system Response characteristic is protected in the control of the equipment such as SSSC, UPFC, IPFC or convertible static compensator when failure, reduces route protection Equipment does not have engineering practicability to the distance protection performance of transmission line of electricity in electric system.
Summary of the invention
In order to solve the above technical problems, an embodiment of the present invention is intended to provide a kind of elimination compensators to route distance protection The method and apparatus of influence solve the problems, such as that the prior art has an impact the defencive function of line protective device, it is ensured that line Road protects equipment to carry out the performance of distance protection to route, has ensured the safe and stable operation of electric system, ensure that engineering reality The property used.
In order to achieve the above objectives, the technical solution of the embodiment of the present invention is achieved in that
A method of eliminating influence of the compensator to route distance protection, which comprises
Obtain the electric current of the series connection inverter in the route or compensator of compensator access；Wherein, the compensator is used for The electric current of the route of the compensator access is controlled, the compensator includes static synchronous series compensator, Unified Power Flow control Flow controller and convertible static compensator between device, line；
Obtain the voltage of the bus of the compensator access or the route of compensator access；
Compare the relationship between the electric current and predetermined current threshold；
If the electric current is greater than the predetermined current threshold, and the first duration was greater than the first preset time threshold, moved back Series transformer in the series connection inverter and the compensator out；Wherein, first duration is that the electric current is big In the duration of the predetermined current threshold；
Compare the relationship between the voltage and predetermined voltage threshold；
If the voltage is less than or equal to the predetermined voltage threshold, and the second duration was greater than the second preset time Threshold value exits the series connection inverter and the series transformer；Wherein, second duration be the voltage be less than or Person is equal to the duration of the predetermined voltage threshold.
It is optionally, described to exit the series connection inverter and the series transformer, comprising:
It is latched the series connection inverter, and triggers and is connected with the quick by-pass switch of the series transformer parallel connection；
If the series transformer is in parallel with mechanical bypass switch, it is closed the mechanical bypass switch.
It is optionally, described to exit after the series connection inverter and the series transformer, further includes:
When preset time arrives, the electric current and voltage of the route of the compensator access are obtained；
If the electric current of the route of compensator access is within the scope of predetermined current, and the route of compensator access Voltage enables the series connection inverter and the series transformer in predetermined voltage range.
Optionally, when in the input end side of the series transformer, the quick by-pass switch and the series transformer Parallel connection, and in the output end of the series transformer, the mechanical bypass switch is in parallel with the series transformer, described to move back Out after the series connection inverter and the series transformer, further includes:
When the mechanical bypass switch disconnects, transmission is executed instruction to line protective device；Wherein, the route protection Equipment is the route for protecting the compensator access, and described execute instruction is used to indicate the line protective device update The distance protection impedance definite value of the route of the compensator access；
The timing since executing instruction transmission after being spaced preset time period, obtains the electricity of the route of the compensator access Stream and voltage；
If the electric current of the route of compensator access is within the scope of predetermined current, and the route of compensator access Voltage enables the series connection inverter and the series transformer in predetermined voltage range；
When mechanical bypass switch closure, notification signal is sent to the line protective device；Wherein, the notice The distance protection impedance definite value that signal is used to indicate the route that the line protective device restores the compensator access is update Value before the distance protection impedance definite value of the route of the compensator access.
Optionally, first preset time threshold is less than at the first time；Wherein, the first time is that the route is protected Time needed for the I sections of progress analytical calculations of distance protection for the route that shield equipment accesses the compensator and the distance protection The sum of I sections protection act delay time；
Alternatively, first preset time threshold is less than the difference of the first time and the turn-on time of quick by-pass switch Value.
A method of influence of the compensator to route distance protection is eliminated, it is defeated when the series transformer in compensator Enter end side, quick by-pass switch is in parallel with series transformer, and in the output end of the series transformer, mechanical bypass switch It is in parallel with the series transformer, which comprises
Receive executing instruction for compensator transmission；
It is executed instruction described in response, obtain the distance protection impedance definite value of the route of compensator access and is set as the One impedance；
It is added first impedance to obtain the second impedance with the leakage reactance of the series transformer；
Second impedance is set by the distance protection impedance definite value for the route that the compensator accesses；
Receive the notification signal that the compensator is sent；
The notification signal is responded, and sets described for the distance protection impedance definite value for the route that the compensator accesses First impedance.
A method of eliminating influence of the compensator to route distance protection, which comprises
When the route of compensator access works normally, the series connection in the route or compensator of the compensator access is detected The electric current of inverter, and detect the voltage of the route of compensator access bus or compensator access；
Compare the relationship between the electric current and predetermined current threshold；
If the electric current is greater than the predetermined current threshold, and the first duration was greater than the first preset time threshold, closed The series connection inverter is locked, and triggers and is connected with the quick by-pass switch of the series transformer parallel connection；Wherein, it described first holds The continuous time is the duration that the electric current is greater than the predetermined current threshold；
If the series transformer is in parallel with mechanical bypass switch, it is closed the mechanical bypass switch；
If the electric current be less than or equal to the predetermined current threshold, if the electric current be greater than the predetermined current Threshold value and first duration are less than or equal to first preset time threshold, the voltage and predeterminated voltage Relationship between threshold value；
If the voltage is less than or equal to the predetermined voltage threshold, and the second duration was greater than the second preset time Threshold value is latched the series connection inverter, and triggers and be connected with the quick by-pass switch of the series transformer parallel connection；Wherein, institute Stating for the second duration is the duration that the voltage is less than or equal to the predetermined voltage threshold；
If the series transformer is in parallel with mechanical bypass switch, it is closed the mechanical bypass switch；
If the voltage is greater than the predetermined voltage threshold, when executing the route normal work accessed when compensator, The electric current of the series connection inverter in compensator or the route of compensator access is detected, and detects the mother of the compensator access The voltage of line or the route of compensator access.
A kind of compensator, the compensator include: first acquisition unit, the first comparing unit and exit unit；Wherein:
The first acquisition unit, for obtaining the electricity of the series connection inverter in the route or compensator that compensator accesses Stream；Wherein, the compensator is used to control the electric current of the route of the compensator access, and the compensator includes Static Synchronous string Join flow controller and convertible static compensator between compensator, THE UPFC, line；
The first acquisition unit is also used to obtain the bus of the compensator access or the route of compensator access Voltage；
First comparing unit, for the relationship between the electric current and predetermined current threshold；
It is described to exit unit, if being greater than the predetermined current threshold for the electric current, and the first duration was greater than the One preset time threshold exits the series transformer in the series connection inverter and the compensator；Wherein, described first continues Time is the duration that the electric current is greater than the predetermined current threshold；
First comparing unit, the relationship being also used between voltage and predetermined voltage threshold described in comparison；
It is described to exit unit, if being also used to the voltage less than or equal to the predetermined voltage threshold, and second continues Time is greater than the second preset time threshold, exits the series connection inverter and the series transformer；Wherein, described second continues Time is the duration that the voltage is less than or equal to the predetermined voltage threshold.
Optionally, the unit that exits includes: first processing module and Second processing module；Wherein:
The first processing module for being latched the series connection inverter, and triggers in parallel with the series transformer Quick by-pass switch conducting；
The Second processing module is closed the machinery if in parallel with mechanical bypass switch for the series transformer By-pass switch.
Optionally, described to exit after unit further include: second acquisition unit and first processing units；Wherein:
The second acquisition unit, the electric current of the route for when preset time arrives, obtaining the compensator access And voltage；
The first processing units, if for the compensator access route electric current within the scope of predetermined current, and The voltage of the route of the compensator access enables the series connection inverter and the series-transformer in predetermined voltage range Device.
Optionally, when in the input end side of the series transformer, the quick by-pass switch and the series transformer Parallel connection, and in the output end of the series transformer, the mechanical bypass switch is in parallel with the series transformer, described to move back Out after unit further include: transmission unit, third acquiring unit and the second processing unit；Wherein:
The transmission unit, for when the mechanical bypass switch disconnects, transmission to be executed instruction to line protective device； Wherein, the line protective device is the route for protecting the compensator access, and described execute instruction is used to indicate institute State the distance protection impedance definite value that line protective device updates the route of the compensator access；
The third acquiring unit, for the timing since executing instruction transmission, after being spaced preset time period, described in acquisition The electric current and voltage of the route of compensator access；
Described the second processing unit, if for the compensator access route electric current within the scope of predetermined current, and The voltage of the route of the compensator access enables the series connection inverter and the series-transformer in predetermined voltage range Device；
The transmission unit is also used to send notification signal to the route when the mechanical bypass switch is closed and protect Protect equipment；Wherein, the notification signal be used to indicate the line protective device restore compensator access route away from Value before being the distance protection impedance definite value for updating the route of the compensator access from protection impedance definite value.
Optionally, first preset time threshold is less than at the first time；Wherein, the first time is that the route is protected Time needed for the I sections of progress analytical calculations of distance protection for the route that shield equipment accesses the compensator and the distance protection The sum of I sections protection act delay time；
Alternatively, first preset time threshold is less than the difference of the first time and the turn-on time of quick by-pass switch Value.
A kind of line protective device, when the input end side of the series transformer in compensator, quick by-pass switch and string Join transformers connected in parallel, and in the output end of the series transformer, mechanical bypass switch is in parallel with the series transformer, institute Stating device includes: receiving unit, third processing unit, computing unit and setting unit；Wherein:
The receiving unit, for receiving executing instruction for compensator transmission；
The third processing unit, for respond it is described execute instruction, obtain the distance of the route of the compensator access Protection impedance definite value is simultaneously set as the first impedance；
The computing unit, for being added first impedance to obtain the second resistance with the leakage reactance of the series transformer It is anti-；
The setting unit, the distance protection impedance definite value of the route for accessing the compensator are set as described Two impedances；
The receiving unit is also used to receive the notification signal that the compensator is sent；
The setting unit is also used to respond the notification signal, and the distance for the route that the compensator is accessed is protected Shield impedance definite value is set as first impedance.
A kind of compensator, the compensator include: detection unit, the second comparing unit, fourth processing unit and execute list Member；Wherein:
The detection unit when route for accessing when compensator works normally, detects the line of the compensator access The electric current of series connection inverter in road or compensator, and detect the electricity of the route of compensator access bus or compensator access Pressure；
Second comparing unit, for the relationship between the electric current and predetermined current threshold；
The fourth processing unit, if being greater than the predetermined current threshold for the electric current, and the first duration is big In the first preset time threshold, it is latched the series connection inverter, and triggers the quick bypass in parallel with the series transformer and opens Close conducting；Wherein, first duration is the duration that the electric current is greater than the predetermined current threshold；
The fourth processing unit is closed the machine if it is in parallel with mechanical bypass switch to be also used to the series transformer Tool by-pass switch；
Second comparing unit, if being also used to the electric current less than or equal to the predetermined current threshold, Huo Zheruo The electric current is greater than the predetermined current threshold and first duration is less than or equal to the first preset time threshold Value, the relationship between the voltage and predetermined voltage threshold；
The fourth processing unit, if being also used to the voltage is less than or equal to the predetermined voltage threshold, and second Duration is greater than the second preset time threshold, is latched the series connection inverter, and trigger in parallel with the series transformer Quick by-pass switch conducting；Wherein, second duration is that the voltage is less than or equal to the predetermined voltage threshold Duration；
The fourth processing unit is closed the machine if it is in parallel with mechanical bypass switch to be also used to the series transformer Tool by-pass switch；
The execution unit executes described when compensator accesses if being greater than the predetermined voltage threshold for the voltage Route when working normally, detect the electric current of the series connection inverter in compensator or the route of compensator access, and detect The voltage of the route of the bus or compensator access of the compensator access.
The method and apparatus that influence of the compensator to route distance protection is eliminated provided by the embodiment of the present invention, obtain Compensator access route or compensator in series connection inverter electric current, and obtain compensator access bus or compensator connect The voltage of the route entered is greater than predetermined current threshold in electric current, and the first duration was greater than the first preset time threshold, exited Series connection inverter and series transformer are less than or equal to predetermined voltage threshold in voltage, and the second duration was greater than second Preset time threshold exits series connection inverter and series transformer；In this way, working as electric system in line protective device work The electric current of the route of series connection inverter or the compensator access of the compensator of use meets preset condition, or when electric system is adopted The electric current of the route of series connection inverter or the compensator access of compensator is unsatisfactory for preset condition, but the series connection of compensator is changed The voltage of stream device or the route of compensator access meets preset condition, exits series connection inverter and series transformer, changes series connection Stream device and series transformer do not work, and eliminate the operation characteristic of series connection inverter and series transformer to line protective device It influences, convenient for the working condition of series connection inverter and series transformer in control compensator, solves the prior art to route The problem of defencive function of protection equipment has an impact, it is ensured that line protective device carries out the performance of distance protection to route, protects The safe and stable operation for having hindered electric system, ensure that engineering practicability.
Detailed description of the invention
Fig. 1 is a kind of process of the method for influence of the elimination compensator provided in an embodiment of the present invention to route distance protection Schematic diagram；
Fig. 2 is the stream of the method for influence of another elimination compensator provided in an embodiment of the present invention to route distance protection Journey schematic diagram；
Fig. 3 is the stream of the method for another influence of the elimination compensator to route distance protection provided in an embodiment of the present invention Journey schematic diagram；
Fig. 4 is the stream of the method for another influence of the elimination compensator to route distance protection provided in an embodiment of the present invention Journey schematic diagram；
Fig. 5 is a kind of structural schematic diagram of static synchronous series compensator provided in an embodiment of the present invention；
Fig. 6 is the structural schematic diagram of another static synchronous series compensator provided in an embodiment of the present invention；
Fig. 7 is a kind of structural schematic diagram of compensator provided in an embodiment of the present invention；
Fig. 8 is the structural schematic diagram of another compensator provided in an embodiment of the present invention；
Fig. 9 is the structural schematic diagram of another compensator provided in an embodiment of the present invention；
Figure 10 is a kind of structural schematic diagram of line protective device provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description.
The embodiment of the present invention provides a kind of method of influence of the elimination compensator to route distance protection, referring to Fig.1 shown in, Method includes the following steps:
Step 101, the electric current for obtaining the route for mending compensator access or repaying the series connection inverter in device.
Wherein, compensator is used to control the electric current of the route of compensator access, and compensator includes Static Synchronous Series compensation Flow controller and convertible static compensator between device, THE UPFC, line.
Specifically, the electric current that step 101 obtains the series connection inverter in the route or compensator of compensator access can be by The device of influence of the compensator to route distance protection is eliminated to realize.Eliminate the dress of influence of the compensator to route distance protection It sets and can be compensator, compensator for example can be power flowcontrol between static synchronous series compensator, THE UPFC, line The equipment such as device and convertible static compensator.
The present embodiment is the route failure in compensator access, line protective device (such as protective relaying device) need pair The route of compensator access carries out proposition when relay protection operation；And obtaining series connection inverter or compensation in compensator Before the electric current of the route of device access, when the route of compensator access works normally, compensator can be to the series connection in compensator The voltage of the route of the electric current of inverter or the route of compensator access, the bus of compensator access or compensator access carries out real When monitor, can find in time in this way compensator access route whether break down.
The voltage of the route of step 102, the bus for obtaining compensator access or compensator access.
If specifically, step 102 electric current be less than or equal to predetermined current threshold, if electric current be greater than predetermined current threshold Value and the first duration are less than or equal to the first preset time threshold, the bus of acquisition compensator access or compensator access Route voltage can the device of influence by elimination compensator to route distance protection realize.
Step 103 compares relationship between electric current and predetermined current threshold.
Specifically, step 103 compare the relationship between electric current and predetermined current threshold can be by elimination compensator to route The device of the influence of distance protection is realized.Wherein, predetermined current threshold can be the mistake galvanic electricity being able to bear to electric system Stream carries out actual measurement and analyzes an obtained empirical value, or carries out the empirical value that theory analysis obtains, or practical Measurement analysis and theory analysis combine obtained empirical value.It should be noted that predetermined current threshold can be repaired as the case may be Positive change.
If step 104, electric current are greater than predetermined current threshold, and the first duration was greater than the first preset time threshold, moved back Series transformer in series connection inverter and compensator out.
Wherein, the first duration was the duration that electric current is greater than predetermined current threshold.
If specifically, step 104 electric current is greater than predetermined current threshold, and the first duration was greater than the first preset time threshold Value, exiting series transformer in series connection inverter and compensator can influence by elimination compensator to route distance protection Device is realized.First preset time threshold can be the empirical value analyzed by actual measurement, or be managed By the empirical value that analysis obtains, or combine actual measurement and the theoretical empirical value analyzed.
Relationship between step 105, comparison voltage and predetermined voltage threshold.
Specifically, the relationship between step 105 comparison voltage and predetermined voltage threshold can be by elimination compensator to route The device of the influence of distance protection is realized.Predetermined voltage threshold can be the empirical value for carrying out theory analysis acquisition, can be with That the measurement of a large amount of actual conditions and theory analysis obtain, predetermined voltage threshold can be modified change concrete condition can be with It is determined according to actual use situation.
If step 106, voltage are less than or equal to predetermined voltage threshold, and the second duration was greater than the second preset time Threshold value exits series connection inverter and series transformer.
Wherein, the second duration was the duration that voltage is less than or equal to predetermined voltage threshold.
If specifically, step 106 voltage is less than or equal to predetermined voltage threshold, and voltage is less than or equal to default electricity The duration of threshold value is pressed to be greater than the second preset time threshold, exiting series connection inverter and series transformer can be compensated by eliminating The device of influence of the device to route distance protection is realized.Second preset time threshold can be by a large amount of actual conditions into The empirical value that row measurement post analysis obtains is also possible to carry out the empirical value of theory analysis acquisition, can also be a large amount of practical feelings What condition measurement and theory analysis obtained, change concrete condition can be modified to predetermined voltage threshold can be according to actual use Situation determines.If the voltage of the route of the bus or compensator access of compensator access is greater than predetermined voltage threshold, repeat Step 101-106 can exit the series connection inverter in compensator in this way when the route of compensator access breaks down again And series transformer, eliminate influence of the compensator to line protective device.
The method that influence of the compensator to route distance protection is eliminated provided by the embodiment of the present invention obtains compensator and connects The electric current of series connection inverter in the route or compensator entered, and obtain the bus of compensator access or the route of compensator access Voltage, electric current be greater than predetermined current threshold, and the first duration be greater than the first preset time threshold, exit the series connection change of current Device and series transformer are less than or equal to predetermined voltage threshold in voltage, and the second duration was greater than the second preset time Threshold value exits series connection inverter and series transformer；In this way, in line protective device work, when the benefit that electric system uses The electric current for repaying the series connection inverter of device or the route of compensator access meets preset condition, or the compensation when electric system use The electric current of the route of series connection inverter or the compensator access of device is unsatisfactory for preset condition, but the series connection inverter or benefit of compensator The voltage for repaying the route of device access meets preset condition, exits series connection inverter and series transformer, makes connect inverter and string Connection transformer does not work, and eliminates influence of the operation characteristic of series connection inverter and series transformer to line protective device, just The working condition of series connection inverter and series transformer in control compensator, solves the prior art to line protective device Protective value the problem of having an impact, it is ensured that line protective device carries out the performance of distance protection to route, has ensured electric power The safe and stable operation of system, ensure that engineering practicability.
The embodiment of the present invention provides a kind of method of influence of the elimination compensator to route distance protection, referring to shown in Fig. 2, Method includes the following steps:
Step 201, compensator obtain the electric current of the series connection inverter in the route or compensator of compensator access.
Wherein, compensator is used to control the electric current of the route of compensator access, and compensator includes Static Synchronous Series compensation Flow controller and convertible static compensator between device, THE UPFC, line.
Specifically, being static synchronous series compensator with compensator, the electric current of acquisition can be the electricity of alternating current, acquisition Pressure can be and be illustrated for alternating voltage, when the electric system of Static Synchronous Series control works normally or failure When, the route of the alternating current or compensator access of the series connection inverter in available static synchronous series compensator Alternating current.
Step 202, compensator obtain the voltage of the bus of compensator access or the route of compensator access.
Step 203, compensator compare series connection inverter or compensator access route electric current and predetermined current threshold it Between relationship.
Specifically, the corresponding predetermined current threshold of alternating current of series connection inverter and exchanging for the route that accesses of compensator The corresponding predetermined current threshold of electric current may be the same or different, and concrete condition is determines according to actual conditions.Compensator is real-time Compare the size relation between the electric current and predetermined current threshold of the series connection inverter of acquisition or the route of compensator access.
If the electric current of the route of step 204, series connection inverter or compensator access is greater than predetermined current threshold, and first holds The continuous time is greater than the first preset time threshold, compensator locking series connection inverter, and triggers in parallel with series transformer quick By-pass switch conducting.
Wherein, the first duration was that the electric current of the route of series connection inverter or compensator access is greater than predetermined current threshold Duration；First preset time threshold is less than first time, is the distance protection I of the route of compensator access at the first time When the sum of the time of the adaptive setting of section and distance protection I sections of delay time or the first preset time threshold are less than first Between difference with the response time of quick by-pass switch.
Specifically, it is in parallel with the series transformer in compensator to judge whether there is mechanical bypass switch, if by without machinery Way switch is in parallel with the series transformer in compensator, then triggers the quick bypass in parallel with the series transformer in compensator and open Close conducting, realize series transformer do not work, in static synchronous series compensator as shown in Figure 5 series transformer 42 and quickly The connection type of by-pass switch 44；Series connection inverter in locking compensator can make series connection inverter not work.In this way, going here and there Join inverter or compensator access route electric current be greater than predetermined current threshold, and the first duration be greater than first it is default when Between threshold value when, compensator locking series connection inverter, and trigger be connected with the quick by-pass switch of series transformer parallel connection, Neng Goushi The function of existing overcurrent protection.
Wherein, if having, mechanical bypass switch is in parallel with series transformer, step 204 compensator locking series connection inverter, and After triggering is connected with the quick by-pass switch of series transformer parallel connection, step 205 is executed；If without mechanical bypass switch with connect Transformers connected in parallel does not then execute step 205 after step 204.
If step 205, series transformer are in parallel with mechanical bypass switch, compensator is closed mechanical bypass switch.
Specifically, if the input end side of the series transformer in compensator, quick by-pass switch and the series transformer It is in parallel with the series transformer to have mechanical bypass switch at this time in the output end of series transformer for parallel connection, now it is necessary to touch After sending out the quick by-pass switch conducting, it is closed mechanical bypass switch, can just series transformer be made not work；String in compensator Join the output end of transformer, quick by-pass switch is in parallel with the series transformer, static synchronous series compensator as shown in Figure 6 The connection type of middle series transformer 42 and quick by-pass switch 44 and mechanical bypass switch 49, at this time in the defeated of series transformer End side out, can there is that mechanical bypass switch is in parallel with the series transformer, and quick by-pass switch can make series transformer not work Make, the effect that closure mechanical bypass switch is realized is to be further ensured that series transformer does not work.In this way, if series connection inverter or The electric current of the route of compensator access is greater than predetermined current threshold, and the electric current of the route of connect inverter or compensator access is big It is greater than the first preset time threshold, compensator locking series connection inverter in the duration of predetermined current threshold, and triggers and string Join the quick by-pass switch conducting of transformers connected in parallel, compensator is closed mechanical bypass switch, also can be realized the function of overcurrent protection Energy.
Step 206, compensator compare the voltage and predeterminated voltage of the bus of compensator access or the route of compensator access Relationship between threshold value.
Specifically, the alternating voltage and predetermined voltage threshold to the bus accessed in static synchronous series compensator compare Compared with analysis, or the alternating voltage of line attachment in static synchronous series compensator is compared with predetermined voltage threshold point Analysis.Wherein, the alternating voltage of the bus accessed in static synchronous series compensator corresponds to predetermined voltage threshold and Static Synchronous string The corresponding predetermined voltage threshold of alternating voltage of line attachment may be the same or different in connection compensator, and concrete condition can To be determined according to actual use situation.
If the voltage of the route of the bus or compensator access of step 207, compensator access is less than or equal to default electricity Pressure threshold value, and the second duration was greater than the second preset time threshold, compensator locking series connection inverter, and triggered and change of connecting The quick by-pass switch of depressor parallel connection is connected.
Wherein, the second duration was that the voltage of the route of the bus that compensator accesses or compensator access is less than or waits In the duration of predetermined voltage threshold.
Specifically, if in parallel with the series transformer without mechanical bypass switch, without carrying out step 208, if organic Tool by-pass switch is in parallel with the series transformer, executes step 208；
If step 208, series transformer are in parallel with mechanical bypass switch, compensator is closed mechanical bypass switch.
Based on the above embodiment, referring to shown in Fig. 3, in other embodiments of the invention, if without machinery in compensator By-pass switch is in parallel with the series transformer, then step 209-210 can also be performed after step 204 or step 207；Or If mechanical bypass switch is in parallel with the series transformer in compensator, step can also be performed after step 205 or step 208 Rapid 209-210；
Step 209, when preset time arrive when, compensator obtain compensator access route electric current and voltage.
Specifically, preset time can be a period, it is also possible to the also following time point, it can be according to reality Line protective device is executed in the situation of border carry out the corresponding protection act of route protection function with it the time required to or theoretical divide It analyses obtained empirical value to be set, such as can be 5 minutes etc.；In the series connection exited in static synchronous series compensator After inverter and series transformer, when preset time arrives, the line of the compensator access in static synchronous series compensator is obtained The alternating current and alternating voltage on road, wherein preset time can be what user set according to specific troubleshooting scenario, not do Any restriction.
If the electric current of the route of step 210, compensator access is within the scope of predetermined current, and the route of compensator access For voltage in predetermined voltage range, compensator enables series connection inverter and series transformer.
Specifically, can by simultaneously judge compensator access route alternating current whether in predetermined current range Whether the alternating voltage of the route of interior and compensator access is in predetermined voltage range, or first judges the route of compensator access Alternating current whether within the scope of predetermined current, if compensator access route alternating current within the scope of predetermined current, Then judge compensator access route alternating voltage whether in predetermined voltage range, or first judge compensator access line Whether the alternating voltage on road is in predetermined voltage range, if the alternating voltage of the route of compensator access is in predetermined voltage range It is interior, then the alternating current of the route of compensator access is judged whether within the scope of predetermined current, if obtaining judging result compensator The alternating current of the route of access is within the scope of predetermined current, and the alternating voltage of the route of compensator access is in predeterminated voltage model In enclosing, when compensator access route alternating current within the scope of predetermined current, and the alternating current of the route of compensator access When being pressed in predetermined voltage range, the series connection inverter and series transformer that have dropped out are reactivated, make connect inverter and Series transformer is again introduced into working condition, realizes to active and reactive power flow the control in electric system.
It should be noted that the alternating voltage of the route of the bus or compensator access of compensator access is less than or equal to Predetermined voltage threshold, and the alternating voltage of the bus of compensator access or the route of compensator access is less than or equal to default electricity Press threshold value duration be less than or equal to the second preset time threshold, if compensator access bus or compensator connect The alternating voltage of the route entered is greater than predetermined voltage threshold, and compensator can repeat step 201-210, work as compensator in this way When the route of access breaks down again, series connection inverter and the series transformer in compensator can be exited, and when default When time arrives, series connection inverter and the series transformer in compensator are reactivated, to the trend of the route of compensator access It is controlled.
It should also be noted that, the explanation in the present embodiment with same steps in other embodiments or concept, Ke Yican According to the description in other embodiments, details are not described herein again.
The method that influence of the compensator to route distance protection is eliminated provided by the embodiment of the present invention obtains compensator and connects The electric current of series connection inverter in the route or compensator entered, the route that the bus or compensator for obtaining compensator access access Voltage is greater than predetermined current threshold in electric current, and the first duration was greater than the first preset time threshold, exited series connection inverter And series transformer, it is less than or equal to predetermined voltage threshold in voltage, and the second duration was greater than the second preset time threshold Value exits series connection inverter and series transformer；In this way, in line protective device work, when the compensation that electric system uses The electric current of the route of series connection inverter or the compensator access of device meets preset condition, or the compensator when electric system use Series connection inverter or the electric current of route of compensator access be unsatisfactory for preset condition, but the series connection inverter of compensator or compensation The voltage of the route of device access meets preset condition, exits series connection inverter and series transformer, makes connect inverter and series connection Transformer does not work, and eliminates influence of the operation characteristic of series connection inverter and series transformer to line protective device, is convenient for The working condition for controlling the series connection inverter and series transformer in compensator, solves the prior art to line protective device The problem of protective value has an impact, it is ensured that line protective device carries out the performance of distance protection to route, has ensured power train The safe and stable operation of system further after troubleshooting, makes the series connection inverter and string in the control device of access again Join transformer work, the idle and effective power flow of electric system is controlled, ensure that engineering practicability.
The embodiment of the present invention provides a kind of method of influence of the elimination compensator to route distance protection, referring to shown in Fig. 4, Method includes the following steps:
Step 301, compensator obtain the electric current of the series connection inverter in the route or compensator of compensator access.
Wherein, compensator is used to control the electric current of the route of compensator access, and compensator includes Static Synchronous Series compensation Flow controller and convertible static compensator between device, THE UPFC, line.
Step 302, compensator obtain the voltage of the bus of compensator access or the route of compensator access.
Step 303, compensator compare series connection inverter or compensator access route electric current and predetermined current threshold it Between relationship.
If the electric current of the route of step 304, series connection inverter or compensator access is greater than predetermined current threshold, and first holds The continuous time is greater than the first preset time threshold, compensator locking series connection inverter, and triggers in parallel with series transformer quick By-pass switch conducting.
Wherein, the first duration was that the electric current of the route of series connection inverter or compensator access is greater than predetermined current threshold Duration；First preset time threshold is less than first time, is the distance protection I of the route of compensator access at the first time The time of the adaptive setting of section and distance protection I sections of the sum of delay time；Alternatively, when the first preset time threshold is less than first Between difference with the response time of quick by-pass switch.
Specifically, locking series connection inverter can send voltage by giving the quick by-pass switch of series transformer parallel connection Control signal is connected to trigger the quick by-pass switch.
It should be noted that not executing step 305~310 Hes if in parallel with mechanical bypass switch without series transformer Step 313~315.
Step 305, when mechanical bypass switch disconnect when, compensator transmission execute instruction to line protective device.
Wherein, line protective device is the route for protecting compensator to access, and executes instruction and is used to indicate route guarantor Protect the distance protection impedance definite value that equipment updates the route of compensator access.
Specifically, the device for eliminating influence of the compensator to route distance protection can also be line protective device, route Protection equipment can be the line protective devices such as protective relaying device.It can establish and communicate between compensator and line protective device Process, after exiting series transformer and series connection inverter, transmission is executed instruction to line protective device, and announcement trunk protection is set The distance protection line resistance definite value of the standby route for updating compensator access, and execute corresponding protection operation.Wherein, execution refers to Order can be after triggering is connected with the quick by-pass switch of series transformer parallel connection, and mechanical bypass switch is sent to route before being closed Protect equipment.
Step 306, line protective device receive executing instruction for compensator transmission.
Step 307, line protective device response execute instruction, and the distance protection impedance for obtaining the route of compensator access is fixed It is worth and is set as the first impedance.
Specifically, the distance protection impedance definite value of the route of compensator access is the intrinsic resistance of route of compensator access It is anti-.
First impedance is added to obtain the second impedance with the leakage reactance of series transformer by step 308, line protective device.
Specifically, the leakage reactance of series transformer can be from the operation instructions of series transformer or series transformer It is obtained in nameplate.
The distance protection impedance definite value for the route that compensator accesses is set the second resistance by step 309, line protective device It is anti-.
Specifically, the distance protection impedance definite value for the route that compensator accesses is set the second impedance by line protective device Influence of the compensator to line protective device can further be eliminated.Wherein, when the line that line protective device accesses compensator After the distance protection impedance definite value on road is set as the second impedance, response instruction can be sent to compensator, such compensator receives It can determine that line protective device has executed operation corresponding with its route protection function after to response instruction, such as update benefit Repay the distance protection impedance definite value of the route of device access.
If step 310, series transformer are in parallel with mechanical bypass switch, compensator is closed mechanical bypass switch.
Specifically, can be received in compensator when there is mechanical bypass switch in parallel with the series transformer in compensator After the response instruction that line protective device is sent, the mechanical bypass switch is closed while being latched quick by-pass switch.
Step 311, the timing since executing instruction transmission, after being spaced preset time period, compensator obtains compensator access Route electric current and voltage.
Specifically, preset time period can be by executing its route protection function to line protective device in practical application The empirical value that time needed for corresponding protection act is analyzed, or be also possible to by being held to line protective device Time needed for row line protection act carries out the empirical value that theory analysis obtains or actual conditions analysis and theory analysis It can be 1 minute in conjunction with obtained empirical value, such as preset time period；After transmission executes instruction 1 minute, start to obtain compensation The alternating current and alternating voltage of the route of device access.
If the electric current of the route of step 312, compensator access is within the scope of predetermined current, and the route of compensator access For voltage in predetermined voltage range, compensator enables series connection inverter and series transformer.
Specifically, in embodiments of the present invention, the requirement of quick by-pass switch is selected to be: when the response of quick by-pass switch Between be less than compensator access route I section of distance protection of adaptive setting time and distance protection I sections delay time it With.Enabling series connection inverter can be realized by unlocking series connection inverter, and enabling series transformer can be by disconnecting and going here and there The mechanical bypass switch for joining transformers connected in parallel realizes, in practical engineering applications, after mechanical bypass switch closure, conducting Quick by-pass switch can automatic blocking.
Step 313, when mechanical bypass switch closure, compensator sends notification signal to line protective device.
Wherein, the distance protection impedance that notification signal is used to indicate the route of line protective device restoration and compensation device access is determined Value before distance protection impedance definite value of the value to update the route of compensator access.
Specifically, being sent to immediately after notification signal can be the mechanical bypass switch closure in parallel with series transformer The signal of line protective device.
Step 314, line protective device receive the notification signal that compensator is sent.
Step 315, line protective device respond notification signal, and the distance protection impedance of the route of compensator access is determined Value is set as the first impedance.
Specifically, when the distance protection impedance definite value for the route that compensator accesses is set the first resistance by line protective device After anti-, a response instruction can be sent to compensator.
The route that step 316, compensator compare the bus of compensator access or compensator line attachment compensator accesses Relationship between voltage and predetermined voltage threshold.
If the voltage of the route of the bus or compensator line attachment compensator access of step 317, compensator access is less than Or it is equal to predetermined voltage threshold, and the second duration was greater than the second preset time threshold, compensator is latched series connection inverter, And it triggers and is connected with the quick quick by-pass switch of bypass quick closing valve of series transformer parallel connection.
Wherein, the second duration was the bus of compensator access or the route of compensator line attachment compensator access Voltage is less than or equal to the duration of predetermined voltage threshold.
Step 305~step 315 is executed specifically, can choose after executing step 317.
It should be noted that if the voltage of the route of the bus or compensator access of compensator access is greater than predeterminated voltage threshold Value, according to the concrete condition of the route of compensator access, selection repeats step 301-317, in this way when compensator access When route breaks down again, series connection inverter and the series transformer in compensator can be exited, and when preset time arrives When coming, series connection inverter and the series transformer in compensator are reactivated, the trend of the route of compensator access is controlled System.
Also, other implementations are referred to the explanation of same steps in other embodiments or concept in the present embodiment Description in example, details are not described herein again.
The method that influence of the compensator to route distance protection is eliminated provided by the embodiment of the present invention, obtains in compensator Series connection inverter or compensator access route electric current, obtain the bus of compensator access or the route of compensator access Voltage is greater than predetermined current threshold in electric current, and electric current is greater than the duration of predetermined current threshold greater than the first preset time Threshold value exits series connection inverter and series transformer, is less than or equal to predetermined voltage threshold in voltage, and voltage be less than or Duration equal to predetermined voltage threshold is greater than the second preset time threshold, exits series connection inverter and series transformer；This Sample, in line protective device work, when the route of series connection inverter or the compensator access for the compensator that electric system uses Electric current meet preset condition, or the compensator used when electric system series connection inverter or compensator access route Electric current is unsatisfactory for preset condition, but the voltage of the route of series connection inverter or the compensator access of compensator meets preset condition, Exit series connection inverter and series transformer, make to connect inverter and series transformer does not work, eliminate series connection inverter and Influence of the operation characteristic of series transformer to line protective device, convenient for the series connection inverter in control compensator and change of connecting The working condition of depressor solves the problems, such as that the prior art has an impact the protective value of line protective device, it is ensured that route It protects equipment to carry out the performance of distance protection to route, has ensured the safe and stable operation of electric system, further, worked as failure After exclusion, make the series connection inverter and series transformer work in the control device of access again, to the idle of electric system and Effective power flow is controlled, and ensure that engineering practicability.
Based on previous embodiment, the embodiment of the present invention provides a kind of side of influence of the elimination compensator to route distance protection Method, method includes the following steps:
Step a, when the route of compensator access works normally, compensator detects the route or compensator of compensator access In series connection inverter electric current, and detect compensator access bus or compensator access route voltage.
Step b, compensator compares the relationship between electric current and predetermined current threshold.
If step c, electric current is greater than predetermined current threshold, and the first duration was greater than the first preset time threshold, compensation Device locking series connection inverter, and trigger and be connected with the quick by-pass switch of series transformer parallel connection.
Wherein, the first duration was the duration that electric current is greater than predetermined current threshold.
If step d, series transformer is in parallel with mechanical bypass switch, it is closed mechanical bypass switch.
If step e, electric current be less than or equal to predetermined current threshold, if electric current be greater than predetermined current threshold and first Duration is less than or equal to the first preset time threshold, the relationship between compensator comparison voltage and predetermined voltage threshold.
If step f, voltage is less than or equal to predetermined voltage threshold, and the second duration was greater than the second preset time threshold Value, compensator locking series connection inverter, and trigger and be connected with the quick by-pass switch of series transformer parallel connection.
Wherein, the second duration was the duration that voltage is less than or equal to predetermined voltage threshold.
If step g, series transformer is in parallel with mechanical bypass switch, compensator is closed mechanical bypass switch.
If step h, voltage is greater than predetermined voltage threshold, compensator is executed when the route that compensator accesses works normally, The electric current of the series connection inverter in compensator or the route of compensator access is detected, and detects bus or the compensation of compensator access The voltage of the route of device access.
It should be noted that the explanation in the present embodiment with same steps in other embodiments or concept, is referred to Description in other embodiments, details are not described herein again.
The method that influence of the compensator to route distance protection is eliminated provided by the embodiment of the present invention obtains compensator and connects The electric current of series connection inverter in the route or compensator entered, the route that the bus or compensator for obtaining compensator access access Voltage is greater than predetermined current threshold in electric current, and the first duration was greater than the first preset time threshold, exited series connection inverter And series transformer, and it is less than or equal to predetermined voltage threshold in voltage, and the second duration was greater than the second preset time Threshold value exits series connection inverter and series transformer；In this way, in line protective device work, when the benefit that electric system uses The electric current for repaying the series connection inverter of device or the route of compensator access meets preset condition, or the compensation when electric system use The electric current of the route of series connection inverter or the compensator access of device is unsatisfactory for preset condition, but the series connection inverter or benefit of compensator The voltage for repaying the route of device access meets preset condition, exits series connection inverter and series transformer, makes connect inverter and string Connection transformer does not work, and eliminates influence of the operation characteristic of series connection inverter and series transformer to line protective device, just The working condition of series connection inverter and series transformer in control compensator, solves the prior art to line protective device Protective value the problem of having an impact, it is ensured that line protective device carries out the performance of distance protection to route, has ensured electric power The safe and stable operation of system, further, after troubleshooting, make again access control device in series connection inverter and Series transformer work, controls the idle and effective power flow of electric system, ensure that engineering practicability.
Wherein, the circuit connecting mode of static synchronous series compensator used in the above embodiment of the present invention is referred to Shown in Fig. 5, comprising: series connection inverter 41, series transformer 42, connect inverter output end current transformer 43, Quick side Way switch 44, compensator access bus 45, bus-bar potential transformer 46, series transformer output end voltage transformer 47 With the current transformer 48 of series transformer output end.Wherein, the current transformer 43 of series connection inverter output end is for obtaining The electric current of series connection inverter is taken, bus-bar potential transformer 46 is used to obtain the voltage of the bus 45 of compensator access, series-transformer The voltage transformer 47 of device output end is used to obtain the voltage of the route of compensator access, the electricity of series transformer output end Current transformer 48 is used to obtain the electric current of the route of compensator access.Quick by-pass switch 44 is in parallel with series transformer 42, even It connects in series transformer output end.It should be noted that can also include mechanical bypass switch, machine in circuit shown in Fig. 5 Tool by-pass switch is in parallel with series transformer, is also connected in series transformer output end.
Further, the circuit connecting mode of static synchronous series compensator used in the above embodiment of the present invention may be used also With referring to shown in Fig. 6, quick by-pass switch 44 can also be connected in the input terminal of series transformer in parallel, at this point it is possible to organic Tool by-pass switch 49 is in parallel with series transformer, is connected in series transformer output end.
The embodiment of the invention provides a kind of compensators 5, can be applied to one kind that the corresponding embodiment in Fig. 1~4 provides and disappear Except in the method for influence of the compensator to route distance protection, referring to shown in Fig. 7, the compensator include: first acquisition unit 51, First comparing unit 52 and exit unit 53, in which:
First acquisition unit 51, for obtaining the electric current of the series connection inverter in the route or compensator that compensator accesses.
Wherein, compensator is the electric current for controlling the route of compensator access, and compensator includes that Static Synchronous Series are mended Repay flow controller and convertible static compensator between device, THE UPFC, line.
First acquisition unit 51 is also used to obtain the voltage of the bus of compensator access or the route of compensator access.
First comparing unit 52, for comparing the relationship between electric current and predetermined current threshold.
Unit 53 is exited, if being greater than predetermined current threshold for electric current, and the first duration was greater than the first preset time Threshold value exits series connection inverter and series transformer.
Specifically, the first duration was the duration that electric current is greater than predetermined current threshold；First preset time threshold Less than at the first time, wherein be at the first time compensator access route I section of distance protection of adaptive setting time and away from The sum of delay time of I sections from protection；Alternatively, the first preset time threshold is less than the response with quick by-pass switch at the first time The difference of time.
First comparing unit 52, the relationship being also used between comparison voltage and predetermined voltage threshold.
Unit 53 is exited, if being also used to voltage less than or equal to predetermined voltage threshold, and the second duration was greater than the Two preset time thresholds exit series connection inverter and series transformer.
Wherein, the second duration was the duration that voltage is less than or equal to predetermined voltage threshold.
Compensator provided by the embodiment of the present invention obtains the series connection change of current in the route or compensator of compensator access The electric current of device, obtains the voltage of the bus of compensator access or the route of compensator access, is greater than predetermined current threshold in electric current, And first the duration be greater than the first preset time threshold, exit series connection inverter and series transformer, otherwise obtain compensator The voltage of the route of bus or the compensator access of access, and it is less than or equal to predetermined voltage threshold in voltage, and second holds The continuous time is greater than the second preset time threshold, exits series connection inverter and series transformer；In this way, working in line protective device When, when the electric current of route that the series connection inverter or compensator of the compensator that electric system uses access meets preset condition, or Person is unsatisfactory for preset condition when the electric current of the series connection inverter of the compensator of electric system use or the route of compensator access, but The voltage of the route of series connection inverter or the compensator access of compensator meets preset condition, exits series connection inverter and series connection becomes Depressor makes series connection inverter and series transformer not work, and eliminates the operation characteristic pair of series connection inverter and series transformer The influence of line protective device solves convenient for the working condition of series connection inverter and series transformer in control compensator The problem of prior art has an impact the protective value of line protective device, it is ensured that line protective device carries out distance to route The performance of protection has ensured the safe and stable operation of electric system, further, after troubleshooting, makes the control of access again Series connection inverter and series transformer work in device processed, control the idle and effective power flow of electric system, guarantee Engineering practicability.
Specifically, referring to shown in Fig. 8, exiting unit 53 includes: first processing module 531 and Second processing module 532, In:
First processing module 531 for being latched series connection inverter, and triggers the quick bypass in parallel with series transformer and opens Close conducting.
Second processing module 532 is closed mechanical bypass switch if in parallel with mechanical bypass switch for series transformer.
Specifically, being exited after unit 53 referring to shown in Fig. 8 further include: second acquisition unit 54 and first processing units 55, in which:
Second acquisition unit 54, for obtaining the electric current and voltage of the route of compensator access when preset time arrives.
First processing units 55, if the electric current of the route for compensator access within the scope of predetermined current, and compensator The voltage of the route of access enables series connection inverter and series transformer in predetermined voltage range.
Specifically, referring to shown in Fig. 9, when in the input end side of series transformer, quick by-pass switch and series transformer Parallel connection, and in the output end of series transformer, mechanical bypass switch is in parallel with series transformer, exits unit 53 and also wraps later It includes: transmission unit 56, third acquiring unit 57 and the second processing unit 58, in which:
Transmission unit 56, for when mechanical bypass switch disconnects, transmission to be executed instruction to line protective device.
Wherein, line protective device is the route for protecting compensator to access, and executes instruction and is used to indicate route guarantor Protect the distance protection impedance definite value that equipment updates the route of compensator access.
Third acquiring unit 57 after being spaced preset time period, obtains compensator for the timing since executing instruction transmission The electric current and voltage of the route of access.
The second processing unit 58, if the electric current of the route for compensator access within the scope of predetermined current, and compensator The voltage of the route of access enables series connection inverter and series transformer in predetermined voltage range.
Transmission unit 56 is also used to send notification signal to line protective device when mechanical bypass switch is closed.
Wherein, the distance protection impedance that notification signal is used to indicate the route of line protective device restoration and compensation device access is determined Value before distance protection impedance definite value of the value to update the route of compensator access.
It should be noted that the interactive process in the present embodiment between each unit and module, is referred to Fig. 1~4 pair Interactive process in a kind of method of influence of the elimination compensator that the embodiment answered provides to route distance protection, herein no longer It repeats.
Compensator provided by the embodiment of the present invention obtains the series connection inverter in the route or compensator of compensator access Electric current, obtain compensator access bus or compensator access route voltage, electric current be greater than predetermined current threshold, and First duration was greater than the first preset time threshold, exited series connection inverter and series transformer, otherwise obtains compensator and connects The voltage of the route of bus or the compensator access entered, and it is less than or equal to predetermined voltage threshold in voltage, and second continues Time is greater than the second preset time threshold, exits series connection inverter and series transformer；In this way, working in line protective device When, when the electric current of route that the series connection inverter or compensator of the compensator that electric system uses access meets preset condition, or Person is unsatisfactory for preset condition when the electric current of the series connection inverter of the compensator of electric system use or the route of compensator access, but The voltage of the route of series connection inverter or the compensator access of compensator meets preset condition, exits series connection inverter and series connection becomes Depressor makes series connection inverter and series transformer not work, and eliminates the operation characteristic pair of series connection inverter and series transformer The influence of line protective device solves convenient for the working condition of series connection inverter and series transformer in control compensator The problem of prior art has an impact the protective value of line protective device, it is ensured that line protective device carries out distance to route The performance of protection has ensured the safe and stable operation of electric system, further, after troubleshooting, makes the control of access again Series connection inverter and series transformer work in device processed, control the idle and effective power flow of electric system, guarantee Engineering practicability.
The embodiment of the invention provides a kind of line protective devices 6, when the input terminal of the series transformer in compensator Side, quick by-pass switch is in parallel with series transformer, and in the output end of series transformer, and mechanical bypass switch becomes with connecting Depressor is in parallel, and referring to Fig.1 shown in 0, which includes: that receiving unit 61, third processing unit 62, computing unit 63 and setting are single Member 64, in which:
Receiving unit 61, for receiving executing instruction for compensator transmission.
Third processing unit 62 is executed instruction for responding, and the distance protection impedance for obtaining the route of compensator access is fixed It is worth and is set as the first impedance.
Computing unit 63 obtains the second impedance for the first impedance to be added with the leakage reactance of series transformer.
The distance protection impedance definite value of setting unit 64, the route for accessing compensator is set as the second impedance.
Receiving unit 61 is also used to receive the notification signal of compensator transmission.
Setting is 64 yuan single, is also used to respond notification signal, and the distance protection impedance definite value for the route that compensator is accessed It is set as the first impedance.
It should be noted that the interactive process in the present embodiment between each unit and module, can be mentioned with previous embodiment Interactive process in a kind of method of influence of the elimination compensator supplied to route distance protection, details are not described herein again.
Line protective device provided by the embodiment of the present invention, receive compensator transmission execute instruction after, response is held Row instruction, executes operation corresponding with executing instruction；In this way, in line protective device work, when the benefit that electric system uses The electric current for repaying the series connection inverter of device or the route of compensator access meets preset condition, or the compensation when electric system use The electric current of the route of series connection inverter or the compensator access of device is unsatisfactory for preset condition, but the series connection inverter or benefit of compensator The voltage for repaying the route of device access meets preset condition, and when exiting series connection inverter and series transformer, line protective device is connect Executing instruction for compensator transmission is received, and responds and executes instruction, further obviates the fortune of series connection inverter and series transformer Influence of the row characteristic to line protective device, convenient for the work shape of series connection inverter and series transformer in control compensator State solves the problems, such as that the prior art has an impact the protective value of line protective device, it is ensured that line protective device is to line Road carries out the performance of distance protection, has ensured the safe and stable operation of electric system, ensure that engineering practicability.
Based on previous embodiment, the embodiment of the invention provides a kind of compensator, which includes: detection unit, Two comparing units, fourth processing unit and execution unit, in which:
Detection unit, when the route for accessing when compensator works normally, the route of detection compensator access or compensation The electric current of series connection inverter in device, and detect the voltage of the bus of compensator access or the route of compensator access.
Second comparing unit, for comparing the relationship between electric current and predetermined current threshold.
Fourth processing unit, if for electric current be greater than predetermined current threshold, and the first duration be greater than first it is default when Between threshold value, locking series connection inverter, and trigger be connected with the quick by-pass switch of series transformer parallel connection.
Wherein, the first duration was the duration that electric current is greater than predetermined current threshold.
Fourth processing unit is closed mechanical bypass switch if it is in parallel with mechanical bypass switch to be also used to series transformer.
Second comparing unit, if being also used to electric current less than or equal to predetermined current threshold, if electric current be greater than it is default Current threshold, and the first duration was less than or equal to the first preset time threshold, comparison voltage and predetermined voltage threshold it Between relationship.
Fourth processing unit, if being also used to voltage less than or equal to predetermined voltage threshold, and the second duration was greater than Second preset time threshold, locking series connection inverter, and trigger and be connected with the quick by-pass switch of series transformer parallel connection.
Wherein, the second duration was the duration that voltage is less than or equal to predetermined voltage threshold.
Fourth processing unit is closed mechanical bypass switch if it is in parallel with mechanical bypass switch to be also used to series transformer.
Execution unit executes if being greater than predetermined voltage threshold for voltage when the route that compensator accesses works normally, The electric current of the series connection inverter in compensator or the route of compensator access is detected, and detects bus or the compensation of compensator access The voltage of the route of device access.
It should be noted that the interactive process in the present embodiment between each unit and module, is referred to aforementioned implementation Interactive process in a kind of method of influence of the elimination compensator that example provides to route distance protection, details are not described herein again.
Compensator provided by the embodiment of the present invention obtains the series connection inverter in the route or compensator of compensator access Electric current, obtain compensator access bus or compensator access route voltage, electric current be greater than predetermined current threshold, and First duration was greater than the first preset time threshold, exited series connection inverter and series transformer, and be less than in voltage or Equal to predetermined voltage threshold, and the second duration was greater than the second preset time threshold, exited series connection inverter and series-transformer Device；In this way, being accessed in line protective device work when the series connection inverter or compensator of the compensator that electric system uses The electric current of route meets preset condition, or the compensator used when electric system series connection inverter or compensator access line The electric current on road is unsatisfactory for preset condition, but the voltage of the route of series connection inverter or the compensator access of compensator meets default item Part exits series connection inverter and series transformer, so that series connection inverter and series transformer is not worked, eliminates series connection inverter Influence with the operation characteristic of series transformer to line protective device, convenient in control compensator series connection inverter and series connection The working condition of transformer solves the problems, such as that the prior art has an impact the protective value of line protective device, it is ensured that line Road protects equipment to carry out the performance of distance protection to route, has ensured the safe and stable operation of electric system, ensure that engineering reality The property used.
In practical applications, first acquisition unit 51, the first comparing unit 52, exit unit 53, second acquisition unit 54, First processing units 55, transmission unit 56, third acquiring unit 57, the second processing unit 58, receiving unit 61, third processing are single Member 62, computing unit 63, setting unit 64, first processing module 531 and Second processing module 532 can be by being located at wireless data Central processing unit (Central Processing Unit, CPU), microprocessor (Micro Processor in sending device Unit, MPU), digital signal processor (Digital Signal Processor, DSP) or field programmable gate array (Field Programmable Gate Array, FPGA) etc. is realized.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program Product.Therefore, the shape of hardware embodiment, software implementation or embodiment combining software and hardware aspects can be used in the present invention Formula.Moreover, the present invention, which can be used, can use storage in the computer that one or more wherein includes computer usable program code The form for the computer program product implemented on medium (including but not limited to magnetic disk storage and optical memory etc.).
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates, Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one The step of function of being specified in a box or multiple boxes.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.

Claims (14)

1. a kind of method of influence of elimination compensator to route distance protection, which is characterized in that the described method includes:
Obtain the electric current of the series connection inverter in the route or compensator of compensator access；Wherein, the compensator is for controlling The electric current of the route of the compensator access, the compensator includes static synchronous series compensator, THE UPFC, line Between flow controller and convertible static compensator；
Obtain the voltage of the bus of the compensator access or the route of compensator access；
Compare the relationship between the electric current of acquisition and predetermined current threshold；
If the electric current obtained is greater than the predetermined current threshold, and the first duration was greater than the first preset time threshold, exited Series transformer in the series connection inverter and the compensator；Wherein, first duration is that the electric current is greater than The duration of the predetermined current threshold；
Compare the relationship between the voltage and predetermined voltage threshold；
If the voltage is less than or equal to the predetermined voltage threshold, and the second duration was greater than the second preset time threshold Value, exits the series connection inverter and the series transformer；Wherein, second duration be the voltage be less than or Equal to the duration of the predetermined voltage threshold.
2. the method according to claim 1, wherein described exit the series connection inverter and the series-transformer Device, comprising:
It is latched the series connection inverter, and triggers and is connected with the quick by-pass switch of the series transformer parallel connection；
If the series transformer is in parallel with mechanical bypass switch, it is closed the mechanical bypass switch.
3. method according to claim 1 or 2, which is characterized in that described to exit the series connection inverter and the series connection After transformer, further includes:
When preset time arrives, the electric current and voltage of the route of the compensator access are obtained；
If the electric current of the route of the compensator access is within the scope of predetermined current, and the voltage of the route of compensator access In predetermined voltage range, the series connection inverter and the series transformer are enabled.
4. method according to claim 1 or 2, which is characterized in that when in the input end side of the series transformer, quickly By-pass switch is in parallel with the series transformer, and in the output end of the series transformer, mechanical bypass switch with it is described Series transformer is in parallel, described to exit after the series connection inverter and the series transformer, further includes:
When the mechanical bypass switch disconnects, transmission is executed instruction to line protective device；Wherein, the line protective device It is the route for protecting the compensator access, described execute instruction is used to indicate described in the line protective device update The distance protection impedance definite value of the route of compensator access；
The timing since executing instruction transmission, after being spaced preset time period, obtain the route of compensator access electric current and Voltage；
If the electric current of the route of the compensator access is within the scope of predetermined current, and the voltage of the route of compensator access In predetermined voltage range, the series connection inverter and the series transformer are enabled；
When mechanical bypass switch closure, notification signal is sent to the line protective device；Wherein, the notification signal Being used to indicate the line protective device to restore the distance protection impedance definite value of the route of the compensator access is described in update Value before the distance protection impedance definite value of the route of compensator access.
5. the method according to claim 1, wherein
First preset time threshold is less than at the first time；Wherein, the first time is line protective device to the benefit Time and distance protection I sections of the protection act needed for repaying I sections of distance protection progress analytical calculations of the route of device access The sum of delay time；
Alternatively, first preset time threshold is less than the difference of the first time and the turn-on time of quick by-pass switch.
6. a kind of method of influence of elimination compensator to route distance protection, which is characterized in that when the series connection in compensator The input end side of transformer, quick by-pass switch is in parallel with series transformer, and in the output end of the series transformer, machine Tool by-pass switch is in parallel with the series transformer, which comprises
Receive executing instruction for compensator transmission；
It is executed instruction described in response, obtain the distance protection impedance definite value of the route of the compensator access and is set as the first resistance It is anti-；
It is added first impedance to obtain the second impedance with the leakage reactance of the series transformer；
Second impedance is set by the distance protection impedance definite value for the route that the compensator accesses；
Receive the notification signal that the compensator is sent；
The notification signal is responded, and sets described first for the distance protection impedance definite value for the route that the compensator accesses Impedance.
7. a kind of method of influence of elimination compensator to route distance protection, which is characterized in that the described method includes:
When the route of compensator access works normally, the series connection change of current in the route or compensator of the compensator access is detected The electric current of device, and detect the voltage of the route of compensator access bus or compensator access；
Compare the relationship between the electric current and predetermined current threshold；
If the electric current is greater than the predetermined current threshold, and the first duration was greater than the first preset time threshold, was latched institute Series connection inverter is stated, and triggers and is connected with the quick by-pass switch of series transformer parallel connection；Wherein, first duration is The electric current is greater than the duration of the predetermined current threshold；
If the series transformer is in parallel with mechanical bypass switch, it is closed the mechanical bypass switch；
Compare the relationship between the voltage and predetermined voltage threshold；
If the voltage is less than or equal to the predetermined voltage threshold, and the second duration was greater than the second preset time threshold Value is latched the series connection inverter, and triggers and be connected with the quick by-pass switch of the series transformer parallel connection；Wherein, described Second duration was the duration that the voltage is less than or equal to the predetermined voltage threshold；
If the series transformer is in parallel with mechanical bypass switch, it is closed the mechanical bypass switch；
If the voltage is greater than the predetermined voltage threshold, described when the route of compensator access works normally, detection is executed The electric current of the route of series connection inverter or compensator access in compensator, and detect compensator access bus or The voltage of the route of the compensator access.
8. a kind of compensator, which is characterized in that the compensator includes: first acquisition unit, the first comparing unit and exits list Member；Wherein:
The first acquisition unit, for obtaining the electric current of the series connection inverter in the route or compensator that compensator accesses；Its In, the compensator is used to control the electric current of the route of the compensator access, and the compensator includes that Static Synchronous Series are mended Repay flow controller and convertible static compensator between device, THE UPFC, line；
The first acquisition unit is also used to obtain the electricity of the bus of the compensator access or the route of compensator access Pressure；
First comparing unit, for comparing the relationship between the electric current of acquisition and predetermined current threshold；
Described to exit unit, if the electric current for acquisition is greater than the predetermined current threshold, and the first duration was greater than first Preset time threshold exits the series transformer in the series connection inverter and the compensator；Wherein, described first continue when Between be the electric current be greater than the predetermined current threshold duration；
First comparing unit, the relationship being also used between voltage and predetermined voltage threshold described in comparison；
It is described to exit unit, if being also used to the voltage is less than or equal to the predetermined voltage threshold, and the second duration Greater than the second preset time threshold, the series connection inverter and the series transformer are exited；Wherein, second duration It is the duration that the voltage is less than or equal to the predetermined voltage threshold.
9. compensator according to claim 8, which is characterized in that the unit that exits includes: first processing module and Two processing modules；Wherein:
The first processing module for being latched the series connection inverter, and triggers in parallel with the series transformer quick By-pass switch conducting；
The Second processing module is closed the mechanical by-pass if in parallel with mechanical bypass switch for the series transformer Switch.
10. compensator according to claim 8 or claim 9, which is characterized in that described to exit after unit further include: second obtains Take unit and first processing units；Wherein:
The second acquisition unit, the electric current and electricity of the route for when preset time arrives, obtaining the compensator access Pressure；
The first processing units, it is and described if the electric current of the route for compensator access is within the scope of predetermined current The voltage of the route of compensator access enables the series connection inverter and the series transformer in predetermined voltage range.
11. according to compensator described in claim 8 or 9, which is characterized in that when the input terminal in the series transformer Side, quick by-pass switch is in parallel with the series transformer, and in the output end of the series transformer, mechanical bypass switch It is in parallel with the series transformer, it is described to exit after unit further include: transmission unit, third acquiring unit and second processing list Member；Wherein:
The transmission unit, for when the mechanical bypass switch disconnects, transmission to be executed instruction to line protective device；Its In, the line protective device is the route for protecting compensator access, it is described execute instruction be used to indicate it is described Line protective device updates the distance protection impedance definite value of the route of the compensator access；
The third acquiring unit obtains the compensation after being spaced preset time period for the timing since executing instruction transmission The electric current and voltage of the route of device access；
Described the second processing unit, it is and described if the electric current of the route for compensator access is within the scope of predetermined current The voltage of the route of compensator access enables the series connection inverter and the series transformer in predetermined voltage range；
The transmission unit is also used to send notification signal to the route protection when the mechanical bypass switch is closed and set It is standby；Wherein, the distance that the notification signal is used to indicate the route that the line protective device restores the compensator access is protected Protect the value before impedance definite value is the distance protection impedance definite value for updating the route of the compensator access.
12. compensator according to claim 8, which is characterized in that
First preset time threshold is less than at the first time；Wherein, the first time is line protective device to the benefit Time and distance protection I sections of the protection act needed for repaying I sections of distance protection progress analytical calculations of the route of device access The sum of delay time；
Alternatively, first preset time threshold is less than the difference of the first time and the turn-on time of quick by-pass switch.
13. a kind of line protective device, which is characterized in that when the input end side of the series transformer in compensator, Quick side Way switch is in parallel with series transformer, and in the output end of the series transformer, mechanical bypass switch and the change of connecting Depressor is in parallel, and the line protective device includes: receiving unit, third processing unit, computing unit and setting unit；Wherein:
The receiving unit, for receiving executing instruction for compensator transmission；
The third processing unit, for respond it is described execute instruction, obtain the distance protection impedance of the route of compensator access Definite value is simultaneously set as the first impedance；
The computing unit, for being added first impedance to obtain the second impedance with the leakage reactance of series transformer；
The setting unit, the distance protection impedance definite value of the route for accessing the compensator are set as second resistance It is anti-；
The receiving unit is also used to receive the notification signal that the compensator is sent；
The setting unit is also used to respond the notification signal, and the distance protection resistance for the route that the compensator is accessed Anti- definite value is set as first impedance.
14. a kind of compensator, which is characterized in that the compensator includes: detection unit, the second comparing unit, fourth process list Member and execution unit；Wherein:
The detection unit, when route for accessing when compensator works normally, detect the compensator access route or The electric current of series connection inverter in compensator, and detect the voltage of the route of compensator access bus or compensator access；
Second comparing unit, for the relationship between the electric current and predetermined current threshold；
The fourth processing unit, if being greater than the predetermined current threshold for the electric current, and the first duration was greater than the One preset time threshold is latched the series connection inverter, and triggers and be connected with the quick by-pass switch of series transformer parallel connection；Its In, first duration is the duration that the electric current is greater than the predetermined current threshold；
The fourth processing unit, if being also used to, the series transformer is in parallel with mechanical bypass switch, and closure is described mechanical other Way switch；
Second comparing unit, the relationship being also used between voltage and predetermined voltage threshold described in comparison；
The fourth processing unit, if being also used to the voltage less than or equal to the predetermined voltage threshold, and second continues Time is greater than the second preset time threshold, is latched the series connection inverter, and triggers in parallel with the series transformer quick By-pass switch conducting；Wherein, second duration is that the voltage is less than or equal to holding for the predetermined voltage threshold The continuous time；
The execution unit executes the line when compensator access if being greater than the predetermined voltage threshold for the voltage When road works normally, the electric current of the series connection inverter in compensator or the route of compensator access is detected, and described in detection The voltage of the route of the bus or compensator access of compensator access.
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CN107026432B (en) 2017-05-26 2019-07-19 南京南瑞继保电气有限公司 A kind of method and apparatus inhibiting influence of the compensator to route distance protection
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
CN108923394B (en) * 2018-06-26 2020-03-20 南京南瑞继保工程技术有限公司 Under-range distance protection method suitable for power transmission line containing unified power flow controller
CN109256777B (en) * 2018-09-20 2021-05-14 东南大学 IPFC topology suitable for parallel double-circuit line power flow control and steady-state modeling method thereof

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