CN106849147A - A kind of control method for reducing direct current transportation commutation failure probability - Google Patents
A kind of control method for reducing direct current transportation commutation failure probability Download PDFInfo
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- CN106849147A CN106849147A CN201710085551.6A CN201710085551A CN106849147A CN 106849147 A CN106849147 A CN 106849147A CN 201710085551 A CN201710085551 A CN 201710085551A CN 106849147 A CN106849147 A CN 106849147A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The present invention proposes a kind of control method for reducing direct current transportation commutation failure probability, and THE UPFC is installed in the adjacent Exchange Station of DC transmission system Inverter Station, and described THE UPFC accesses same AC system with DC transmission system.Using said structure, after the reduction of DC transmission system Inverter Station alternating voltage is detected, the quick control mode switch by THE UPFC is injecting voltage control model, and control to improve the voltage that THE UPFC accesses bus, so as to improve the voltage of DC transmission system Inverter Station incoming transport bus, reduce the probability that DC transmission system occurs commutation failure.Compared to other reactive-load compensations and voltage-operated device, this structure has more preferable economy, and this control method has more significantly effect for reducing direct current transportation commutation failure probability.
Description
Technical field
The present invention relates to a kind of alternating current-direct current mixing technology of transmission of electricity, and in particular to one kind reduces direct current transportation commutation failure probability
Control method.
Background technology
Line commutation HVDC transmission system based on IGCT has transmission line capability big, circuit low cost, asynchronous
Networked capabilities are strong, have great advantage in the aspect such as long-distance and large-capacity power transmission and big area networking tool.DC transmission system is close greatly
Degree incoming transport power network so that influenced each other between AC and DC system increasingly complicated, bring huge to the safe and stable operation of power network
Challenge.The commutation failure failure of high power DC system is relatively common, is triggered by receiving end fault in ac transmission system more.Commutation failure
Period dc power declines to a great extent, and the synchronous generator of direct current sending end power network accelerates, and such as commutation failure duration is short, direct current work(
The fast quick-recovery of rate energy, the stable operation influence on system is little, but continuous influence of the commutation failure to the stability of a system is tighter
Weight, the repeated stock of continuous commutation failure may cause sending end unit to exchange contact section off-the-line with important with respect to generator rotor angle unstability.
The reason for causing commutation failure failure has a lot, but when IGCT and its triggering equal normal work of system, occurs
The main cause of commutation failure is the grid voltage sags or fluctuation caused when receiving end grid collapses.Current direct current transportation
Engineer applied and published patent are mainly by the optimization to direct current transportation control strategy to suppress commutation failure, most of
It is increase shut-off angle or reduction DC current, as the auxiliary preventive means of commutation failure, but cannot can fundamentally avoids changing
The mutually generation of failure.
Large capacity STATCOM and Large Copacity phase modulation are installed in someone's research in recent years near DC transmission system Inverter Station
Machine compensates the reactive power of Inverter Station, the voltage of Inverter Station is improved in the system failure, so that reducing Inverter Station occurs commutation
The probability of failure, but the method is suitable only for the lighter operating mode of receiving end electric network fault, when grid voltage sags are more serious, compensation electricity
Reactive capability required for pressure is fallen is very big, and existing reactive power compensator can not be tackled.
Therefore, it is necessary to study a kind of raising system voltage efficiency power stronger structure and control method, solution in failure
Certainly existing reactive power compensator can not tackle Voltage Drop during power network catastrophe failure, so as to more effectively reduce direct current transportation change
The probability for mutually failing.THE UPFC, is to be at present also known as UPFC (Unified Power Flow Controller)
The only best tidal current controller of versatility, it has the different control function such as shunt compensation, series compensation and phase shift, except
Can optimize outside electric network swim during stable state, can be improved it and access busbar voltage by its quick voltage compensation ability during transient state.
The content of the invention
The purpose of the present invention, is to provide a kind of control method for reducing direct current transportation commutation failure probability, can be
The alternating voltage of DC transmission system Inverter Station is fast and effectively improved during system failure, so as to reduce direct current transportation commutation failure
Probability.The structure that control method of the present invention is based on has preferably warp compared to the structure of present suppression direct current transportation commutation failure
Ji property, the controlling party rule has more preferable inhibition and control flexibility.
In order to achieve the above object, solution of the invention is：
A kind of control method for reducing direct current transportation commutation failure probability, it is characterised in that：
The structure of above-mentioned reduction direct current transportation commutation failure probability includes：DC transmission system, THE UPFC and
AC transmission system；The AC of the DC transmission system Inverter Station accesses above-mentioned exchange with the THE UPFC
Transmission system；The THE UPFC is arranged in the vicinity of the DC transmission system Inverter Station；
Above-mentioned THE UPFC includes side in parallel and series side two parts；The series side of the THE UPFC
Including series transformer and series connection transverter, side in parallel includes shunt transformer and parallel inverter；The Unified Power Flow control
The series transformer side winding of device is connected with the AC of the series connection transverter, and opposite side winding split-phase seals in the exchange
The three-phase AC line of system；The shunt transformer side winding of the THE UPFC and the friendship of the parallel inverter
Stream side connection, opposite side winding accesses the ac bus of the AC transmission system.
The control method of above-mentioned reduction direct current transportation commutation failure probability：
1), the series side of above-mentioned THE UPFC operates in line power control model, direct current described in real-time detection
The alternating voltage of transmission system Inverter Station, and above-mentioned alternating voltage minimum during one Power Control operational mode of setting
Ubus_Lim；
2), it is less than above-mentioned alternating voltage minimum in the alternating voltage for detecting the DC transmission system Inverter Station
After Ubus_Lim, by the series side control model of THE UPFC from line power control mode switch be injecting voltage control
Molding formula；Enter step 3 afterwards；
3), on the basis of the head end voltage direction of the control circuit of THE UPFC series side 4, above-mentioned unified tide is controlled
The series side of stream controller inject one with above-mentioned DC transmission system Inverter Station ac bus direction identical voltage, quickly carry
THE UPFC high accesses the voltage of bus, maintains the alternating voltage of DC transmission system Inverter Station in above-mentioned alternating voltage
Minimum Ubus_Lim, reduces the probability that DC transmission system occurs commutation failure；Enter step 4 afterwards；
4), when the alternating voltage for detecting DC transmission system Inverter Station maintains above-mentioned alternating voltage minimum Ubus_
Lim, and the voltage of the series side injection of above-mentioned THE UPFC act as reduce above-mentioned THE UPFC and access
During the voltage of bus, by the series side control model of THE UPFC from injecting voltage control mode switch be line power
Control model.
After the voltage of above-mentioned THE UPFC series side injection reaches the load voltage value of series transformer, still can not
The alternating voltage of the DC transmission system Inverter Station is maintained in the alternating voltage minimum Ubus_Lim of the setting, then it is described
THE UPFC keeps the voltage of series side injection to remain the load voltage value of series transformer.
Above-mentioned THE UPFC is arranged in the Inverter Station alternating-current field of the DC transmission system, the Unified Power Flow control
The series side control circuit of device control processed accesses same ac bus with the converter power transformer of the DC transmission system Inverter Station.
Above-mentioned THE UPFC is arranged in the Exchange Station near the Inverter Station of the DC transmission system, then described to subtract
The alternating voltage minimum Ubus_Lim set described in the control method of small direct current transportation commutation failure probability is Unified Power Flow
The minimum of the ac bus voltage that the three-phase AC line that controller series transformer split-phase is sealed in is connected.
The ac bus series transformer split-phase that above-mentioned THE UPFC shunt transformer is accessed is sealed in
The ac bus that three-phase AC line is connected, or the AC transmission system other ac bus.
The ac bus series transformer split-phase that above-mentioned THE UPFC shunt transformer is accessed is sealed in
The ac bus that three-phase AC line is connected, then set another voltage-operated minimum Ubus_ of ac bus
Low, the voltage-operated minimum Ubus_low of ac bus are more than Ubus_Lim；Accordingly, the reduction direct current transportation
The control method of commutation failure probability is the method that two-stage coordinates control；
The first order of the two-stage control method for coordinating is controlled to：
A) after the voltage for detecting the ac bus is less than above-mentioned alternating voltage minimum Ubus_low, the unification
The side in parallel of flow controller controls to increase the reactive power that the injection ac bus are provided rapidly, so as to maintain ac bus
Voltage, reduces the probability that DC transmission system occurs commutation failure.Enter step 2 afterwards
B) when the voltage for detecting the ac bus can not be maintained at above-mentioned alternating voltage minimum less than Ubus_low
Afterwards, the idle holding of the side injected system in parallel of the THE UPFC is output as its maximum capacity；Enter second afterwards
Level control；
The second level of the two-stage control method for coordinating is controlled to, the foregoing control for reducing direct current transportation commutation failure probability
Method and step 1)~4)：
1), the series side of above-mentioned THE UPFC operates in line power control model, direct current described in real-time detection
The alternating voltage of transmission system Inverter Station, and above-mentioned alternating voltage minimum during one Power Control operational mode of setting
Ubus_Lim；
2), it is less than above-mentioned alternating voltage minimum in the alternating voltage for detecting the DC transmission system Inverter Station
After Ubus_Lim, by the series side control model of THE UPFC from line power control mode switch be injecting voltage control
Molding formula；Enter step 3 afterwards；
3), on the basis of the head end voltage direction of the control circuit of THE UPFC series side 4, above-mentioned unified tide is controlled
The series side of stream controller inject one with above-mentioned DC transmission system Inverter Station ac bus direction identical voltage, quickly carry
THE UPFC high accesses the voltage of bus, maintains the alternating voltage of DC transmission system Inverter Station in above-mentioned alternating voltage
Minimum Ubus_Lim, reduces the probability that DC transmission system occurs commutation failure；Enter step 4 afterwards；
4), when the alternating voltage for detecting DC transmission system Inverter Station maintains above-mentioned alternating voltage minimum Ubus_
Lim, and the voltage of the series side injection of above-mentioned THE UPFC act as reduce above-mentioned THE UPFC and access
During the voltage of bus, by the series side control model of THE UPFC from injecting voltage control mode switch be line power
Control model.
The above method can be understood as：Line power control mould is operated in the series side of the THE UPFC
Formula, also increases preposition coordination control step before the implementation steps of the control method of the reduction direct current transportation commutation failure probability
Suddenly, the preposition rate-determining steps of coordinating are controlled corresponding to the first order of two-stage control method for coordinating.Foregoing reduction direct current transportation is changed
The mutually control method step 4 of failure probability) to 5) being Two-stage control.
When above-mentioned THE UPFC parallel connection side is broken down, its series side transverter can isolated operation, accordingly
Reduce direct current transportation commutation failure probability control method be：
1), the series side of above-mentioned THE UPFC operates in line power control model, direct current described in real-time detection
The alternating voltage of transmission system Inverter Station, and above-mentioned alternating voltage minimum during one Power Control operational mode of setting
Ubus_Lim；
2), it is less than above-mentioned alternating voltage minimum in the alternating voltage for detecting the DC transmission system Inverter Station
After Ubus_Lim, by the series side control model of THE UPFC from line power control mode switch be constant impedance control
Pattern；Enter step 3 afterwards；
3) series side one reactance of equivalent injection of above-mentioned THE UPFC, equivalent raising Unified Power Flow control, are controlled
Device processed injects the electrical distance of circuit, so as to improve the voltage that THE UPFC accesses bus, maintains DC transmission system
The alternating voltage of Inverter Station reduces the machine that DC transmission system occurs commutation failure in above-mentioned alternating voltage minimum Ubus_Lim
Rate；Enter step 4 afterwards；
4), when the alternating voltage for detecting DC transmission system Inverter Station is more than above-mentioned alternating voltage minimum Ubus_Lim
When, by the series side control model of THE UPFC from injecting voltage control mode switch be line power control model.
The circuit that above-mentioned THE UPFC series side is controlled is double-circuit line, is required to pass through on the double-circuit line
Configure a set of series side transverter and series connection side transformer.Above-mentioned double-circuit line Power Control operational mode alternating voltage most
Low value Ubus_Lim is identical, minimum less than above-mentioned alternating voltage in the alternating voltage for detecting the DC transmission system Inverter Station
After value Ubus_Lim, the series side control model of the double-circuit line is required to from line power control mode switch be injection electricity
Pressure control model.
After such scheme, the present invention can improve ac bus of the DC transmission system Inverter Station in the system failure
Voltage, reduces the probability of commutation failure, improves the stability of DC transmission system and whole AC system.Compared to other suppressions
The measure of commutation failure processed, inhibition of the invention and economy, flexibility are more preferable.
Brief description of the drawings
Fig. 1 is the structure chart of DC transmission system, AC transmission system and THE UPFC connection；
In figure, 1 is the converting plant of DC transmission system, and 2 is the Inverter Station of DC transmission system, and 3 is Unified Power Flow control
The side in parallel of device, 4 is the series side of THE UPFC；
Fig. 2 is that the ac bus that THE UPFC shunt transformer is accessed are other exchanges mother of AC transmission system
Line schematic diagram；
Fig. 3 is the schematic diagram that THE UPFC parallel connection side is broken down；
Fig. 4 is the main control flow chart of reduction direct current transportation commutation failure probability proposed by the present invention；
Fig. 5 is the first order control flow chart of the two poles of the earth control that the present invention reduces direct current transportation commutation failure probability；
Fig. 6 is control flow chart of the present invention when THE UPFC parallel connection side is out of service.
Specific embodiment
Specific embodiment of the invention is described in detail below in conjunction with the accompanying drawings.
The present invention proposes a kind of control method for reducing direct current transportation commutation failure probability, and methods described is applied in such as Fig. 1
In shown structure, including：DC transmission system, THE UPFC and AC transmission system；The DC transmission system
The AC of Inverter Station 2 and the THE UPFC access above-mentioned AC transmission system；The THE UPFC
It is arranged in the vicinity of the DC transmission system Inverter Station；
Foregoing THE UPFC includes side 3 in parallel and the two parts of series side 4；The series connection of the THE UPFC
Side 4 includes series transformer and series connection transverter, and side in parallel 3 includes shunt transformer and parallel inverter；The Unified Power Flow
The series transformer side winding of controller is connected with the AC of the series connection transverter, and opposite side winding split-phase seals in described
The three-phase AC line of AC system；The shunt transformer side winding of the THE UPFC and the parallel inverter
AC connection, opposite side winding accesses the ac bus of the AC transmission system.
The foregoing control method for reducing direct current transportation commutation failure probability is as follows, and flow chart is as shown in Figure 4：
1) series side of above-mentioned THE UPFC operates in line power control model, and direct current described in real-time detection is defeated
The alternating voltage of electric system Inverter Station, and above-mentioned alternating voltage minimum Ubus_ during one line power control model of setting
Lim；
2) it is less than above-mentioned alternating voltage minimum in the alternating voltage for detecting the DC transmission system Inverter Station 2
After Ubus_Lim, by the control model of series side 4 of THE UPFC from line power control mode switch be injecting voltage
Control model；Enter step 3 afterwards)；
3) on the basis of the head end voltage direction of the control circuit of THE UPFC series side 4, above-mentioned unified tide is controlled
The series side 4 of stream controller inject one with the ac bus direction identical voltage of above-mentioned DC transmission system Inverter Station 2, quickly
The voltage that THE UPFC accesses bus is improved, the alternating voltage of DC transmission system Inverter Station 2 is maintained in above-mentioned exchange
Voltage minimum Ubus_Lim, reduces the probability that DC transmission system occurs commutation failure；Enter step 4 afterwards；
4) when the alternating voltage for detecting DC transmission system Inverter Station 2 maintains above-mentioned alternating voltage minimum Ubus_
Lim, and the voltage of the injection of series side 4 of above-mentioned THE UPFC act as reduce above-mentioned THE UPFC and access
During the voltage of bus, by the control model of series side 4 of THE UPFC from injecting voltage control mode switch be circuit work(
Rate control model.
The acting as of the voltage of the injection of series side 4 of above-mentioned THE UPFC reduces above-mentioned THE UPFC and connects
Enter the voltage of bus, method is as follows：On the basis of the head end voltage direction of the control circuit of THE UPFC series side 4, such as
The injected system voltage of THE UPFC series side 4 and line termination voltage are (phase difference is between 90~180 degree) in opposite direction,
May determine that now THE UPFC series side 4 is operated in the state for making the reduction of ac bus voltage, it is believed that now
System has recovered normal, can be by the control model switchback line power control model of the series side 4 of THE UPFC.
After the voltage of foregoing THE UPFC series side injection reaches the load voltage value of series transformer, still can not
The alternating voltage of the DC transmission system Inverter Station 2 is maintained in the alternating voltage minimum Ubus_Lim of the setting, then institute
The voltage for stating the injection of THE UPFC series side 4 remains the load voltage value of series transformer.
Foregoing THE UPFC is arranged in the alternating-current field of the Inverter Station 2 of the DC transmission system, the unified tide
The control circuit of series side 4 of stream controller control accesses same friendship with the converter power transformer of the DC transmission system Inverter Station 2
Stream bus.
If foregoing THE UPFC is arranged in the Exchange Station near the Inverter Station 2 of the DC transmission system,
The alternating voltage minimum Ubus_Lim set described in the control method for reducing direct current transportation commutation failure probability is system
The minimum of the ac bus voltage that the three-phase AC line that one flow controller series transformer split-phase is sealed in is connected.
The ac bus series transformer split-phase that foregoing THE UPFC shunt transformer is accessed is sealed in
The ac bus that three-phase AC line is connected, or the AC transmission system other ac bus.As shown in Figure 2, one
The ac bus that flow controller shunt transformer is accessed are other ac bus of the AC transmission system.
The ac bus series transformer split-phase for as described in accessed such as foregoing THE UPFC shunt transformer is sealed in
The ac bus that are connected of three-phase AC line, then set another voltage-operated minimum Ubus_ of ac bus
Low, the voltage-operated minimum Ubus_low of ac bus are more than Ubus_Lim；Accordingly, the Unified Power Flow control
The series side of device operates in line power control model, and the control method of the reduction direct current transportation commutation failure probability is two-stage
The method for coordinating control；
The first order of the two-stage control method for coordinating controls as follows, flow chart such as accompanying drawing 5：
A) after the voltage for detecting the ac bus is less than above-mentioned alternating voltage minimum Ubus_low, the unification
The side in parallel of flow controller controls to increase the reactive power that the injection ac bus are provided rapidly, so as to maintain ac bus
Voltage, reduces the probability that DC transmission system occurs commutation failure.Enter step B afterwards；
B) it is less than Ubus_ when the voltage for detecting the ac bus can not still be maintained at above-mentioned alternating voltage minimum
After low, the idle holding of the side injected system in parallel of the THE UPFC is output as its maximum capacity；Enter the afterwards
Two-stage control；
The above method can be understood as：Line power control mould is operated in the series side of the THE UPFC
Formula, also increases preposition coordination control step before the implementation steps of the control method of the reduction direct current transportation commutation failure probability
Suddenly, the preposition rate-determining steps of coordinating are controlled corresponding to the first order of two-stage control method for coordinating.The two-stage coordinates controlling party
The second level of method is controlled to the control method step 1 that signature reduces direct current transportation commutation failure probability)~4), flow chart such as accompanying drawing
4。
Coordinated by the two-step evolution of accompanying drawing 4 and accompanying drawing 5, sent out in the high-power operation of straight-flow system or straight-flow system distal end
When raw failure, system voltage fall smaller, make direct current defeated by the control of first order THE UPFC parallel connection side transverter
Electric system Inverter Station ac bus voltage is not less than Ubus_low；As failure occurs to fall in near-end, system voltage larger, pass through
Inverter Station ac bus voltage cannot be maintained Ubus_low by the control of the first order, when system voltage drops to Ubus_Lim
When, second level control action, control makes DC transmission system Inverter Station ac bus voltage in Ubus_Lim；After failure vanishes,
System voltage rises, and now second level control can still work system Inverter Station ac bus voltage in Ubus_Lim, but this
When the injected system voltage of THE UPFC series side 4 direction with before conversely, being connected by by THE UPFC
Whether the injected system voltage of side 4 is compared with ac bus voltage or line termination voltage, it can be determined that extensive go out system voltage
It is multiple normal：As the injected system voltage of THE UPFC series side 4 is in opposite direction with line termination voltage, it can be determined that go out now
THE UPFC series side 4 is operated in the state for making the reduction of ac bus voltage, then can determine whether that system recovers normal, unified
Flow controller series side 4 can be power control mode from injecting voltage control mode switch, recover normal operation.
When foregoing THE UPFC parallel connection side is broken down, its series side transverter can isolated operation, structure chart
Such as accompanying drawing 3, the control method of reduction direct current transportation commutation failure probability is as follows accordingly, its flow chart such as accompanying drawing 6：
1) series side of above-mentioned THE UPFC operates in line power control model, and direct current described in real-time detection is defeated
The alternating voltage of electric system Inverter Station, and set an above-mentioned alternating voltage minimum when line power control model is run
Ubus_Lim；
2) it is less than above-mentioned alternating voltage minimum Ubus_ in the alternating voltage for detecting the DC transmission system Inverter Station
After Lim, by the series side control model of THE UPFC from line power control mode switch be constant impedance control model；
Enter step 3 afterwards；
3) series side one reactance of equivalent injection of above-mentioned THE UPFC, equivalent raising Unified Power Flow control are controlled
Device injects the electrical distance of circuit, so as to improve the voltage that THE UPFC accesses bus, maintains DC transmission system inverse
Become the alternating voltage at station in above-mentioned alternating voltage minimum Ubus_Lim, reduce the machine that DC transmission system occurs commutation failure
Rate；Enter step 4 afterwards；
4) when the alternating voltage for detecting DC transmission system Inverter Station is more than above-mentioned alternating voltage minimum Ubus_Lim
When, by the series side control model of THE UPFC from constant impedance control mode switch be line power control model.
The circuit that foregoing THE UPFC series side is controlled is double-circuit line, and configuration is required on the double-circuit line
At least a set of series side transverter and series connection side transformer.Above-mentioned double-circuit line Power Control operational mode alternating voltage most
Low value Ubus_Lim is identical, minimum less than above-mentioned alternating voltage in the alternating voltage for detecting the DC transmission system Inverter Station
After value Ubus_Lim, the series side control model of the double-circuit line is required to from line power control mode switch be injection electricity
Pressure control model.
Finally it should be noted that：Technical scheme is only illustrated with reference to above-described embodiment rather than its limitations.Institute
The those of ordinary skill in category field is to be understood that：Those skilled in the art can repair to specific embodiment of the invention
Change or equivalent, but these modifications or change are being applied within pending patent requirements protection domain.
Claims (9)
1. it is a kind of reduce direct current transportation commutation failure probability control method, it is characterised in that：
Methods described is applied in the structure including DC transmission system, THE UPFC and AC transmission system；It is described
The AC of DC transmission system Inverter Station and the THE UPFC access above-mentioned AC transmission system；The unification
Flow controller includes side in parallel and series side two parts, wherein, series side includes series transformer and series connection transverter, in parallel
Side includes shunt transformer and parallel inverter；Series transformer side winding connects with the AC of the transverter of connecting
Connect, opposite side winding split-phase seals in the three-phase AC line of the AC system；Shunt transformer side winding with it is described
The AC connection of parallel inverter, opposite side winding accesses the ac bus of the AC transmission system；
The control method includes：
1) series side of above-mentioned THE UPFC operates in line power control model, DC power transmission system described in real-time detection
The alternating voltage of Inverter Station of uniting, and above-mentioned alternating voltage minimum Ubus_Lim during one line power control model of setting；
2) it is less than above-mentioned alternating voltage minimum Ubus_Lim in the alternating voltage for detecting the DC transmission system Inverter Station
Afterwards, by the series side control model of THE UPFC from line power control mode switch be injecting voltage control model；
3) series side of above-mentioned THE UPFC is controlled to inject one with above-mentioned DC transmission system Inverter Station ac bus
Direction identical voltage, it is quick to improve the voltage that THE UPFC accesses bus, maintain DC transmission system Inverter Station
Alternating voltage reduces the probability that DC transmission system occurs commutation failure in above-mentioned alternating voltage minimum Ubus_Lim；
4) when the alternating voltage for detecting DC transmission system Inverter Station maintains above-mentioned alternating voltage minimum Ubus_Lim, and
The acting as of the voltage of the series side injection of above-mentioned THE UPFC reduces above-mentioned THE UPFC and accesses bus
During voltage, by the series side control model of THE UPFC from injecting voltage control mode switch for line power controls mould
Formula.
2. a kind of control method for reducing direct current transportation commutation failure probability as claimed in claim 1, it is characterised in that：If
After the voltage of the THE UPFC series side injection reaches the load voltage value of series transformer, can not still remain described
The alternating voltage of DC transmission system Inverter Station the setting alternating voltage minimum Ubus_Lim, then the Unified Power Flow
The voltage of controller series side injection remains the load voltage value of series transformer.
3. a kind of control method for reducing direct current transportation commutation failure probability as claimed in claim 1, it is characterised in that：It is described
THE UPFC is arranged in the Inverter Station alternating-current field of the DC transmission system, then the THE UPFC is controlled
Series side control circuit accesses same ac bus with the converter power transformer of the DC transmission system Inverter Station.
4. a kind of control method for reducing direct current transportation commutation failure probability as claimed in claim 1, it is characterised in that：If
The THE UPFC is arranged in the adjacent Exchange Station of Inverter Station of the DC transmission system, the then exchange of the setting
The friendship that voltage minimum Ubus_Lim is connected by three-phase AC line that THE UPFC series transformer split-phase is sealed in
Flow the minimum of busbar voltage.
5. a kind of control method for reducing direct current transportation commutation failure probability as claimed in claim 1, it is characterised in that：It is described
The ac bus that THE UPFC shunt transformer is accessed are the three-phase AC line that the series transformer split-phase is sealed in
The ac bus for being connected, or the AC transmission system other ac bus.
6. a kind of control method for reducing direct current transportation commutation failure probability as claimed in claim 5, it is characterised in that：If
The ac bus that the THE UPFC shunt transformer is accessed are the three-phase alternating current that the series transformer split-phase is sealed in
The ac bus that circuit is connected, then set another voltage-operated minimum Ubus_low of ac bus, the friendship
The minimum Ubus_low of stream busbar voltage operation is more than Ubus_Lim；
In such cases, the series side in the THE UPFC operates in line power control model, and the reduction is straight
Also increase preposition coordination rate-determining steps, the preposition coordination before the implementation steps of the control method of stream transmission of electricity commutation failure probability
Rate-determining steps include：
A) after the voltage for detecting the ac bus is less than above-mentioned alternating voltage minimum Ubus_low, the Unified Power Flow
The side in parallel of controller controls to increase the reactive power that the injection ac bus are provided rapidly, so as to maintain ac bus electricity
Pressure, reduces the probability that DC transmission system occurs commutation failure；
B) it is less than Ubus_low when the voltage for detecting the ac bus can not still be maintained at above-mentioned alternating voltage minimum
Afterwards, the idle holding of the side injected system in parallel of the THE UPFC is output as its maximum capacity.
7. a kind of control method for reducing direct current transportation commutation failure probability as claimed in claim 1, it is characterised in that：It is described
THE UPFC parallel connection side when breaking down, its series side transverter can isolated operation, direct current transportation is reduced accordingly
The control method of commutation failure probability is：
1) series side of above-mentioned THE UPFC operates in line power control model, DC power transmission system described in real-time detection
The alternating voltage of Inverter Station of uniting, and set an above-mentioned alternating voltage minimum Ubus_ when line power control model is run
Lim；
2) it is less than above-mentioned alternating voltage minimum Ubus_Lim in the alternating voltage for detecting the DC transmission system Inverter Station
Afterwards, by the series side control model of THE UPFC from line power control mode switch be constant impedance control model；
3) series side one reactance of equivalent injection of above-mentioned THE UPFC, equivalent raising THE UPFC note are controlled
Enter the electrical distance of circuit, so as to improve the voltage that THE UPFC accesses bus, maintain DC transmission system Inverter Station
Alternating voltage in above-mentioned alternating voltage minimum Ubus_Lim, reduce the probability that DC transmission system occurs commutation failure；4)
When the alternating voltage for detecting DC transmission system Inverter Station is more than above-mentioned alternating voltage minimum Ubus_Lim, by unified tide
The series side control model of stream controller from constant impedance control mode switch be line power control model.
8. a kind of control method for reducing direct current transportation commutation failure probability as claimed in claim 1, it is characterised in that：As institute
It is double-circuit line to state the circuit that THE UPFC series side controls, and at least a set of string of configuration is required on the double-circuit line
Connection side transverter and series connection side transformer.
9. a kind of control method for reducing direct current transportation commutation failure probability as claimed in claim 8, it is characterised in that：It is described
Double-circuit line is identical in the alternating voltage minimum Ubus_Lim of Power Control operational mode, is detecting the DC power transmission system
Less than after above-mentioned alternating voltage minimum Ubus_Lim, the series side of the double-circuit line controls mould to the alternating voltage of Inverter Station of uniting
It is injecting voltage control model that formula is required to from line power control mode switch.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107134801A (en) * | 2017-05-12 | 2017-09-05 | 国网河南省电力公司电力科学研究院 | The direct current transportation commutation failure probability acquiring method of meter and commutation failure PREDICTIVE CONTROL |
| CN108110783A (en) * | 2017-12-28 | 2018-06-01 | 国家电网公司 | Control method for coordinating and device between a kind of synchronous capacitor and LCC-HVDC |
| CN108616136A (en) * | 2018-04-10 | 2018-10-02 | 华南理工大学 | Type current type high-voltage DC transmission system commutation failure suppressing method based on series voltage injection |
| CN113472000A (en) * | 2021-08-02 | 2021-10-01 | 国网河南省电力公司电力科学研究院 | Commutation failure control method for multi-feed-in direct current transmission system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414185A (en) * | 2013-07-26 | 2013-11-27 | 南京南瑞继保电气有限公司 | Unified power flow controller and control method thereof |
| CN106026120A (en) * | 2016-06-17 | 2016-10-12 | 中国电力科学研究院 | Adaptive control mode switching-based UPFC alternating iteration power flow calculation method |
-
2017
- 2017-02-17 CN CN201710085551.6A patent/CN106849147B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414185A (en) * | 2013-07-26 | 2013-11-27 | 南京南瑞继保电气有限公司 | Unified power flow controller and control method thereof |
| CN106026120A (en) * | 2016-06-17 | 2016-10-12 | 中国电力科学研究院 | Adaptive control mode switching-based UPFC alternating iteration power flow calculation method |
Non-Patent Citations (3)
| Title |
|---|
| 周飞 等: "适合城市电网的级联型统一潮流控制器", 《电网技术》 * |
| 李鹏 等: "统一潮流控制器在苏南500kV电网中的应用", 《电力工程技术》 * |
| 陈曦: "UPFC提高电力系统电压稳定控制研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107134801A (en) * | 2017-05-12 | 2017-09-05 | 国网河南省电力公司电力科学研究院 | The direct current transportation commutation failure probability acquiring method of meter and commutation failure PREDICTIVE CONTROL |
| CN107134801B (en) * | 2017-05-12 | 2020-03-10 | 国网河南省电力公司电力科学研究院 | Direct-current transmission commutation failure probability solving method considering commutation failure prediction control |
| CN108110783A (en) * | 2017-12-28 | 2018-06-01 | 国家电网公司 | Control method for coordinating and device between a kind of synchronous capacitor and LCC-HVDC |
| CN108110783B (en) * | 2017-12-28 | 2021-05-14 | 国家电网公司 | Method and device for coordination control between synchronous phase modulator and LCC-HVDC |
| CN108616136A (en) * | 2018-04-10 | 2018-10-02 | 华南理工大学 | Type current type high-voltage DC transmission system commutation failure suppressing method based on series voltage injection |
| CN113472000A (en) * | 2021-08-02 | 2021-10-01 | 国网河南省电力公司电力科学研究院 | Commutation failure control method for multi-feed-in direct current transmission system |
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