CN106300330B - A kind of THE UPFC fault case traversing method - Google Patents
A kind of THE UPFC fault case traversing method Download PDFInfo
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- CN106300330B CN106300330B CN201510247528.3A CN201510247528A CN106300330B CN 106300330 B CN106300330 B CN 106300330B CN 201510247528 A CN201510247528 A CN 201510247528A CN 106300330 B CN106300330 B CN 106300330B
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Abstract
The present invention provides a kind of THE UPFC fault case traversing methods, comprising: THE UPFC is accessed transmission line of electricity by step 1；Step 2 judges whether transmission line of electricity breaks down；If step 3, transmission line of electricity break down, its working condition of THE UPFC adjust automatically, to guarantee that THE UPFC is safely operated.Compared with prior art, a kind of THE UPFC fault case traversing method provided by the invention, it can reduce influence when AC electric power systems breaks down to THE UPFC, quick dynamic regulation effect of the THE UPFC in AC electric power systems after fault clearance is played to the greatest extent, while realizing the cooperation being safely operated between THE UPFC and AC electric power systems.
Description
Technical field
The present invention relates to a kind of fault case traversing methods, and in particular to a kind of THE UPFC fault case traversing method
Background technique
THE UPFC (unified power flow controller, UPFC) is a kind of using series-parallel mixed
The novel tidal current controller of structure is closed, voltage source converter technology is used.Series side is equivalent to series connection in the line and is filled with
One controlled voltage source, voltage magnitude and phase can be adjusted arbitrarily.Side in parallel is mainly used for balancing series side and circuit switched
It is active, while playing the function of dynamic passive compensation.With the variation of the phase of series connection injecting voltage, UPFC can be realized electricity
The multiple functions such as adjusting, impedance-compensated, phase shift are pressed, and can be realized the independent decoupling control to route effective power flow and reactive power flow
System.Apply UPFC in power grid, first, it can rationally control Line Flow, realize economical operation；Second, help to realize nothing
Function optimization, improves system voltage stability；Third imposes suitable control, and UPFC can improve system damping, and it is steady to improve generator rotor angle
It is qualitative.Demand is supported in existing dynamic electric voltage, and is had in the power grid of power flowcontrol demand, UPFC can not only provide identical stable state
Performance, or even better dynamic property can be provided, while device total capacity, gross investment, total land occupation can be reduced.
The system failure often results in the over-voltage or overcurrent of important equipment or element inside UPFC, while device being caused to stop transport,
Detrimental effect is brought to system, it is therefore desirable to which reasonable fault case passes through strategy.Fault case passes through strategy and needs based on deeply
Fault Mechanism Analysis and optimize.When system jam, device should be by adjusting control strategy, by the system failure pair
The impulsive control of device in safe range, is of great significance for guarantee UPFC equipment safety, system stable operation.In event
On the basis of hindering Analysis on Mechanism, propose that safe and reliable economic fault case passes through strategy, while realizing UPFC equipment safety
Safeguards system safety is one of the technical difficult points of UPFC unit engineering application.
Summary of the invention
In order to meet the needs of the prior art, the present invention provides a kind of THE UPFC fault case traversing methods.
The technical solution of the present invention is as follows:
A kind of THE UPFC fault case traversing method, which comprises
Step 1: THE UPFC is accessed into transmission line of electricity；
Step 2: judging whether the transmission line of electricity breaks down；
Step 3: if transmission line of electricity breaks down, described its working condition of THE UPFC adjust automatically, to guarantee
THE UPFC safe operation.
Preferably, in the step 1, THE UPFC includes: the first transformer, the second transformer, first change of current
Device, the second inverter, mechanical by-pass switch, thyristor bypass switch and breaker；
Transmission line of electricity is accessed by breaker parallel connection in one end of first transformer, and the other end and the first inverter connect
It connects；One end series connection access transmission line of electricity of second transformer, the other end are connect with the second inverter；First inverter
It is connected with the second inverter；
The mechanical by-pass switch is connected in parallel on the both ends of the second transformer；The thyristor bypass switch is connected to second
Between transformer device and the second inverter；
Preferably, when operating normally after the THE UPFC access transmission line of electricity, breaker is closed state, brilliant
Brake tube by-pass switch is blocking, and mechanical by-pass switch is off-state；
Preferably, in the step 2, judge whether transmission line of electricity breaks down, comprising:
The current signal and voltage signal of the transmission line of electricity are detected, if the current signal is greater than the specified of transmission line of electricity
When electric current and the voltage signal are less than the voltage threshold of transmission line of electricity, then conclude that transmission line of electricity breaks down；
Preferably, in the step 3, THE UPFC adjust automatically working condition, comprising:
Step 31: after detecting that the current signal of transmission line of electricity is greater than its rated current, the second of THE UPFC
Inverter works in no-voltage output mode, so that the second transformer coupled voltage to transmission line of electricity does not influence transmission line of electricity；
Step 32: after detecting that the voltage signal of transmission line of electricity is less than its voltage threshold, the first of THE UPFC
Inverter works in maximum reactive compensation mode, to transmission line of electricity output reactive power；
Step 33: the thyristor bypass switch conducting of THE UPFC is triggered, thus by the second converter blocking；
Step 34: whether the current signal for detecting transmission line of electricity again is greater than its rated current:
If current signal is less than rated current, THE UPFC starts transient fault control strategy, guarantees unified tide
Stream controller safe operation；
If current signal is greater than rated current, THE UPFC starts permanent fault control strategy, guarantees unified tide
Stream controller safe operation；
Preferably, THE UPFC starts transient fault control strategy in the step 34, comprising:
Step 3411: after detecting that the current signal of transmission line of electricity is less than rated current, the second of THE UPFC
Inverter is reworked in no-voltage output mode；
Step 3412: locking thyristor bypass switch；
Step 3413: the second inverter is switched to power flowcontrol mode by no-voltage output mode, according to transmission line of electricity
Trend instruction adjusts active output valve and idle output valve；
Preferably, THE UPFC starts permanent fault control strategy in the step 34, comprising:
Step 3421: after detecting that the current signal of transmission line of electricity is greater than rated current, judging the temperature value of transmission line of electricity
Whether be more than thyristor bypass switch in thyristor temperature threshold, if be more than if be closed mechanical by-pass switch；
Step 3422: locking thyristor bypass switch；
Step 3423: the first inverter is switched to zero reactive compensation mode, and the reactive power exported to transmission line of electricity is zero；
Step 3424: after the reactive current of the first inverter output meets zero output Rule of judgment, locking first is changed
Flow device；
Step 3425: cut-off breaker；
Step 3426: bypass THE UPFC, to disconnect the connection of THE UPFC and transmission line of electricity.
Compared with the immediate prior art, the excellent effect of the present invention is that:
A kind of THE UPFC fault case traversing method provided by the invention, can reduce AC electric power systems
To the influence of THE UPFC when failure, THE UPFC is played to the greatest extent in AC electric power systems in failure
Quick dynamic regulation effect after removing, while realizing the association being safely operated between THE UPFC and AC electric power systems
Allotment is closed.
Detailed description of the invention
The following further describes the present invention with reference to the drawings.
A kind of Fig. 1: THE UPFC fault case traversing method flow chart in the embodiment of the present invention；
Fig. 2: the connection schematic diagram of THE UPFC in the embodiment of the present invention；
Fig. 3: the current flow paths schematic diagram A of THE UPFC in the embodiment of the present invention；
Fig. 4: the current flow paths schematic diagram B of THE UPFC in the embodiment of the present invention；
Fig. 5: the current flow paths schematic diagram C of THE UPFC in the embodiment of the present invention；
Fig. 6: the current flow paths schematic diagram D of THE UPFC in the embodiment of the present invention；
Fig. 7: accumulate station-Zhabei 220kV electric system THE UPFC engineering electrical master in the embodiment of the present invention and connect
Line chart.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
A kind of THE UPFC fault case traversing method provided by the invention, in THE UPFC (unified
Power flow controller, UPFC) in operational process, transmission line of electricity or neighbouring transmission of electricity where detecting UPFC
When line failure, by the coordination of the inverter of UPFC, thyristor bypass switch, mechanical by-pass switch, reduce
Impact of the AC electric power systems failure to UPFC utmostly plays fast quick-action of the UPFC after AC electric power systems Failure elimination
State adjustment effect realizes the cooperation of UPFC safety and AC electric power systems safety, supports safe and stable operation of power system.
The embodiment of THE UPFC fault case traversing method of the present invention shown in FIG. 1, the specific steps are that:
1, THE UPFC is transformed, and is accessed transmission line of electricity.
As shown in Fig. 2, improved THE UPFC in the present embodiment, comprising: the first transformer, the second transformation
Device, the first inverter, the second inverter, mechanical by-pass switch, thyristor bypass switch and breaker.
Transmission line of electricity is accessed by breaker parallel connection in one end of first transformer, and the other end is connect with the first inverter；
One end series connection access transmission line of electricity of second transformer, the other end are connect with the second inverter；
First inverter and the second inverter are connected；
Mechanical by-pass switch is connected in parallel on the both ends of the second transformer；Thyristor bypass switch is connected to the second transformer device
And second between inverter.
When being operated normally after THE UPFC access transmission line of electricity, the state of each device are as follows:
Breaker is closed state, and thyristor bypass switch is blocking, and mechanical by-pass switch is off-state.
2, the current signal and voltage signal of transmission line of electricity are detected.
3, judge whether transmission line of electricity breaks down.
When current signal is greater than the rated current of transmission line of electricity, and voltage signal is less than the voltage threshold of transmission line of electricity, system
One flow controller adjust automatically its working condition, to guarantee that THE UPFC is safely operated.Wherein, Fig. 3 shows defeated
Current flow paths in THE UPFC when electric line does not break down, specifically:
(1) after detecting that the current signal of transmission line of electricity is greater than its rated current, second change of current of THE UPFC
Device works in no-voltage output mode, and the second inverter is zero output state at this time, transformer coupled to power transmission line by second
The voltage on road can be ignored, and will not have an impact to transmission line of electricity.
(2) after detecting that the voltage signal of transmission line of electricity is less than its voltage threshold, first change of current of THE UPFC
Device works in maximum reactive compensation mode, is that electric system provides reactive power to the greatest extent by the first inverter, maintains
Level of the transmission line of electricity before breaking down.
(3) the thyristor bypass switch conducting for triggering THE UPFC, so that by the second converter blocking, Fig. 4 shows
Current flow paths in THE UPFC at this time are gone out.
(4) whether the current signal for detecting transmission line of electricity again is greater than its rated current:
If A, current signal is less than rated current, THE UPFC starts transient fault control strategy, guarantees unified
Flow controller safe operation.Specifically:
1.: after detecting that the current signal of transmission line of electricity is less than rated current, the second inverter of THE UPFC
It reworks in no-voltage output mode, Fig. 5 shows current flow paths in THE UPFC at this time.
2.: locking thyristor bypass switch；
3.: the second inverter is switched to power flowcontrol mode by no-voltage output mode, and the trend according to transmission line of electricity refers to
It enables and adjusts active output valve and idle output valve, meet adjusting requirement of the electric system to trend, Fig. 6 is shown unifies tide at this time
Current flow paths in stream controller.
If B, current signal is greater than rated current, THE UPFC starts permanent fault control strategy, guarantees unified
Flow controller safe operation.Specifically:
1.: after detecting that the current signal of transmission line of electricity is greater than rated current, judge whether the temperature value of transmission line of electricity surpasses
The temperature threshold for crossing thyristor in thyristor bypass switch is closed mechanical by-pass switch if being more than；
2.: locking thyristor bypass switch；
3.: the first inverter is switched to zero reactive compensation mode, and the reactive power exported to transmission line of electricity is zero；
4.: after the reactive current of the first inverter output meets zero output Rule of judgment, it is latched the first inverter；This
Zero output Rule of judgment is that i.e. locking first is changed after reactive current is less than 0.1pu times of nominal reactive electric current in embodiment
Flow device.
5.: bypass THE UPFC, it is out of service to disconnect the connection of THE UPFC and transmission line of electricity.
Now to accumulate station-Zhabei 220kV electric system as embodiment, THE UPFC fault case traversing method is carried out
It illustrates.As shown in fig. 7, accumulate station-Zhabei 220kV electric system include Zhabei-accumulate 2205 route of algae creek, 2210 routes and
2268 route three-line paired runnings, UPFC, which is connected to, to be accumulate in 2268 route of side of station.Wherein:
1.: if breaking down between circuit breaker Q F0 and circuit breaker Q F12, which belongs to the ontology failure of UPFC, leads to
Circuit breaker Q F0 and circuit breaker Q F12 movement is crossed, UPFC and 2268 routes are disconnected, it is out of service, while not influencing neighbouring
The normal operation of 2205 routes and 2210 routes.
2.: if breaking down between the wire-outgoing breaker of 2268 route of circuit breaker Q F12 and Zhabei, pass through circuit breaker Q F12
It is acted with the wire-outgoing breaker of 2268 route of Zhabei, the side of series connection 2268 routes of access of UPFC and 2268 routes is disconnected,
Out of service, the side for receiving road in parallel with 2268 provides voltage support to accumulate station.
In the present embodiment, the protective device for accumulateing 2268 routes of station is configured at circuit breaker Q F12, can be to avoid due to UPFC
Influence of the additional impedance to 2268 route protections that generates of access.It is also wrapped as shown in fig. 7, accumulateing station-Zhabei 220kV electric system
It includes: voltage transformer TV, disconnecting switch QS, current transformer TA, connection transformer TM, start-up resistor R1, valve side ground resistance
R2, direct current measuring devices Id, DC voltage measuring device Vd, valve group SM and bridge arm reactor Lb.
To the step of accumulateing station-Zhabei 220kV electric system THE UPFC progress fault case traversing method are as follows:
1, as shown in fig. 7, UPFC access is accumulate in 2268 routes of station-Zhabei 220kV electric system.
2, the current signal and voltage signal of 2205 routes, 2210 routes and 2268 routes are detected.
3, judge whether 2205 routes, 2210 routes and 2268 routes break down.
(1) assume that the electric current flowed through in 2205 routes is greater than its rated current, voltage signal is less than its voltage threshold, then
The failure protecting device of 2205 routes starts, and guarantees the normal operation of 2210 routes and 2268 routes.The age at failure of 2205 routes
Between may cause in 2268 routes UPFC overstress occur, in order to guarantee not expand fault coverage, UPFC cannot be out of service, tool
Body operation strategy are as follows:
1.: the thyristor bypass switch conducting of THE UPFC is triggered, thus by the second converter blocking.
2.: whether the current signal for detecting 2205 routes again is greater than its rated current:
If current signal is less than rated current, i.e. Failure elimination, then it is latched thyristor bypass switch, restores the normal of UPFC
Operation.
If for some reason, tripping occurs for the failure protecting device of 2205 routes, fault clearing time is more than thyristor
The maximum tolerance time of thyristor valve or maximum tolerable temperature in by-pass switch, for example, being connected in thyristor bypass switch
After 120ms, detect that its rated current is still greater than in the current signal of 2205 routes, then close circuit breaker QF11, by UPFC
Road is out of service.
After the Failure elimination of 2205 routes, it may occur however that the case where power flow transfer, in order to guarantee the protection circuit of UPFC
It does not malfunction, should also control thyristor bypass switch after preset time is connected, judge whether to meet guarantee UPFC's
The condition that circuit does not malfunction is protected, so that guaranteeing the normal operation of non-fault line to greatest extent.
(2) assume that tripping, first the protection circuit operation of circuit breaker Q F0, UPFC occur for the circuit breaker Q F0 in 2268 routes
Concrete operations strategy are as follows:
1.: the thyristor bypass switch conducting of THE UPFC is triggered, thus by the second converter blocking.
2.: whether the current signal for detecting 2268 routes again is greater than its rated current:
If current signal is less than rated current, i.e. Failure elimination, then it is latched thyristor bypass switch, restores the normal of UPFC
Operation.
If circuit breaker Q F0 protects the delay of circuit longer, for example, being detected after 120ms is connected in thyristor bypass switch
Its rated current is still greater than in the current signal of 2205 routes, then close circuit breaker QF11, UPFC is bypassed out of service.
Finally it should be noted that: described embodiment is only some embodiments of the present application, rather than whole realities
Apply example.Based on the embodiment in the application, those of ordinary skill in the art are obtained without making creative work
Every other embodiment, shall fall in the protection scope of this application.
Claims (2)
1. a kind of THE UPFC fault case traversing method, which comprises
Step 1: THE UPFC is accessed into transmission line of electricity；
Step 2: judging whether the transmission line of electricity breaks down；
Step 3: if transmission line of electricity breaks down, described its working condition of THE UPFC adjust automatically, to guarantee unification
Flow controller safe operation；
In the step 1, THE UPFC includes: the first transformer, the second transformer, the first inverter, second change of current
Device, mechanical by-pass switch, thyristor bypass switch and breaker；
Transmission line of electricity is accessed by breaker parallel connection in one end of first transformer, and the other end is connect with the first inverter；Institute
State the first end and second end series connection access transmission line of electricity of the second transformer；The third end of second transformer and second change of current
Device is connected；First inverter and the second inverter are connected；
The mechanical by-pass switch is connected in parallel in the first end and second end of the second transformer；The thyristor bypass switch connects
It is connected between the third end of the second transformer and the second inverter；
In the step 2, judge whether transmission line of electricity breaks down, comprising:
The current signal and voltage signal of the transmission line of electricity are detected, if the current signal is greater than the specified electricity of transmission line of electricity
When stream and the voltage signal are less than the voltage threshold of transmission line of electricity, then conclude that transmission line of electricity breaks down；
In the step 3, THE UPFC adjust automatically working condition, comprising:
Step 31: after detecting that the current signal of transmission line of electricity is greater than its rated current, second change of current of THE UPFC
Device works in no-voltage output mode, so that the second transformer coupled voltage to transmission line of electricity does not influence transmission line of electricity；
Step 32: after detecting that the voltage signal of transmission line of electricity is less than its voltage threshold, first change of current of THE UPFC
Device works in maximum reactive compensation mode, to transmission line of electricity output reactive power；
Step 33: the thyristor bypass switch conducting of THE UPFC is triggered, thus by the second converter blocking；
Step 34: whether the current signal for detecting transmission line of electricity again is greater than its rated current:
If current signal is less than rated current, THE UPFC starts transient fault control strategy, guarantees Unified Power Flow control
Device safe operation processed；
If current signal is greater than rated current, THE UPFC starts permanent fault control strategy, guarantees Unified Power Flow control
Device safe operation processed；
THE UPFC starts transient fault control strategy in the step 34, comprising:
Step 3411: after detecting that the current signal of transmission line of electricity is less than rated current, second change of current of THE UPFC
Think highly of and newly works in no-voltage output mode；
Step 3412: locking thyristor bypass switch；
Step 3413: the second inverter is switched to power flowcontrol mode by no-voltage output mode, the trend according to transmission line of electricity
Instruction adjusts active output valve and idle output valve；
THE UPFC starts permanent fault control strategy in the step 34, comprising:
Step 3421: detect transmission line of electricity current signal be greater than rated current after, judge transmission line of electricity temperature value whether
More than the temperature threshold of thyristor in thyristor bypass switch, mechanical by-pass switch is closed if being more than；
Step 3422: locking thyristor bypass switch；
Step 3423: the first inverter is switched to zero reactive compensation mode, and the reactive power exported to transmission line of electricity is zero；
Step 3424: after the reactive current of the first inverter output meets zero output Rule of judgment, being latched the first inverter；
Step 3425: cut-off breaker；
Step 3426: bypass THE UPFC, to disconnect the connection of THE UPFC and transmission line of electricity.
2. the method as described in claim 1, which is characterized in that normally transported after the THE UPFC access transmission line of electricity
When row, breaker is closed state, and thyristor bypass switch is blocking, and mechanical by-pass switch is off-state.
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| CN107240909B (en) * | 2017-05-26 | 2019-06-14 | 南京南瑞继保电气有限公司 | A kind of method and apparatus reducing influence of the compensator to route distance protection |
| CN107240908B (en) * | 2017-05-26 | 2018-12-21 | 南京南瑞继保电气有限公司 | A kind of method and apparatus reducing influence of the compensator to route distance protection |
| CN107069683B (en) * | 2017-05-26 | 2019-06-14 | 南京南瑞继保电气有限公司 | A kind of method and apparatus for eliminating influence of the compensator to route distance protection |
| CN107196277B (en) * | 2017-06-02 | 2019-02-26 | 重庆大学 | The active heat protection method of transmission line of electricity based on the prediction of electric current tolerance time |
| CN111211544B (en) * | 2020-02-03 | 2021-07-27 | 国家电网有限公司 | Valve side main equipment configuration and transformer grounding system and use method thereof |
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| Title |
|---|
| Effect of fault current limiting of UPFC for power flow control in loop transmission;M.Takeshita等;《IEEE/PES Transmission and Distribution Conference and Exhibition》;20021231;第3卷;第2032-2036页 |
| 基于模块化多电平换流器的统一潮流控制器桥臂电容电压平衡控制策略;崔福博等;《电网技术》;20140731;第38卷(第7期);第1939-1945页 |
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