CN108258723A - A kind of soft direct sending of isolated island goes out system failure traversing control method and system - Google Patents
A kind of soft direct sending of isolated island goes out system failure traversing control method and system Download PDFInfo
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- CN108258723A CN108258723A CN201810033774.2A CN201810033774A CN108258723A CN 108258723 A CN108258723 A CN 108258723A CN 201810033774 A CN201810033774 A CN 201810033774A CN 108258723 A CN108258723 A CN 108258723A
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Classifications
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
-
- 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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
-
- 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
-
- 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
- H02J2003/365—Reducing harmonics or oscillations in HVDC
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
-
- 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]
Abstract
The present invention relates to a kind of soft direct sendings of isolated island to go out system failure traversing control method and system, including：When flexible direct current grid collapses, flexible direct current converter station starts exchange side dynamic braking, puts into braking resistor；After fault clearance, flexible direct current converter station sends out control signal, and the power station receives the control signal enabling new energy active power controller system；Braking resistor is gradually exited if active power controller system regulation active power value reaches default active power control target value and completes fault traversing.Technical solution provided by the invention passes through when DC grid breaks down, the power that input braking resistor consumption new energy is sent out in time, start the power control of new energy station simultaneously, and after power control reaches requirement, braking resistor is exited step by step, smooth control is not only realized, but also realizes fault traversing.
Description
Technical field
The present invention relates to the technical fields of new energy fault traversing control that isolated island access flexible direct current power grid is sent out, and propose
A kind of isolated island soft direct sending goes out system failure traversing control method and system.
Background technology
Extensive new energy long-distance sand transport becomes the major way that new energy sends consumption outside, but with synchronous support electricity
The ratio in source gradually declines or even stops exploitation, and how to convey new energy in the case where weak synchronization support is even without synchronous support becomes
Research hotspot, therefore flexible DC transmission technology is studied, and propose that power grid application flexible DC transmission technology solves extensive wind
Electricity is sent outside will be as following trend.The grid-connected new energy unit of isolated island collects the support there is no synchro source by exchange,
Soft straight power grid is accessed after DC converting, once DC grid breaks down, thousands of new energy units are difficult to accurately
The timely generation for perceiving failure and quickly controlled accordingly, it would be possible to the power injected in DC grid can be caused
It is out-of-limit, DC grid is caused to collapse.
Therefore it needs when DC grid breaks down, the power coordination between research isolated island access power station and DC grid
Control, but power station collected by direct current cost too it is high can only use exchange collect under the premise of, AC system is difficult in time
In ms grades of internal feedbacks and realize power emergent control.
Invention content
When breaking down to solve DC grid, the power coordination control between isolated island access power station and DC grid is asked
Topic, the present invention provides a kind of soft direct sendings of isolated island to go out system failure traversing control method, including：
When flexible direct current converter station breaks down, flexible direct current converter station input braking resistor；
After fault clearance, flexible direct current converter station sends out control signal, and the power station receives the control signal enabling
Active power controller；
When the active power value of flexible direct current converter station reaches default active power control target value, according to presetting
Rule exit braking resistor complete fault traversing.
Preferably, when flexible direct current converter station breaks down, flexible direct current converter station input braking resistor includes：
When flexible direct current converter station breaks down, the power limited according to flexible direct current converter station needs drafts braking electricity
The total capacity of resistance, and braking resistor is grouped according to the total capacity of the braking resistor and the heat dissipation characteristics of resistance material；
When monopole failure occurs for flexible direct current converter station, flexible direct current converter station sends control signal to braking resistor,
Put into the braking resistor being connect with failure pole；
When bipolar failure occurs for flexible direct current converter station, flexible direct current converter station is all put into braking resistor transmission
Signal is controlled, puts into whole braking resistors.
Preferably, the total capacity of the braking resistor includes：It is obtained by multigroup resistor coupled in parallel；
The resistance is calculated as follows：
In formula, UmaxFor alternating voltage peak, when electric station grid connection point voltage is 220kV, then Umax=1.1*220kV；
PNFor the specified transmission capacity of bipolar flexible DC converter station；PDCHold for bipolar flexible DC converter station actual fed during failure
Amount, P during monopole failureDCFor PNHalf, P during bipolar failureDCIt is 0.
Preferably, the resistance that the heat dissipation characteristics of the resistance material determine is shown below：
In formula, w represents power；UmaxFor alternating voltage peak；T is fault time.
Preferably, after fault clearance, flexible direct current converter station sends out control signal, starts active power controller, including：
After monopole fault clearance or after bipolar fault clearance, flexible direct current converter station sends out control signal, the power station
Receive the control signal enabling active power controller.
Preferably, after monopole fault clearance, flexible direct current converter station sends out control signal, and power station receives the control letter
Number start active power controller, including：
After monopole fault clearance, if failure pole current conversion station resumes operation, flexible direct current converter station sends to power station and controls
Signal processed, the power station keep active output；
Otherwise, when failure pole current conversion station is out of service, flexible direct current converter station sends control signal to power station, and according to event
Hinder whether preceding power station active power less than the first threshold of flexible direct current converter station transmission capacity determines whether braking resistor puts into.
Preferably, after bipolar fault clearance, flexible direct current converter station sends out control signal, and power station receives the control letter
Number start active power controller, including：
After bipolar fault clearance, if failure pole current conversion station resumes operation, flexible direct current converter station is sent to power station
Signal is controlled, the power station keeps active output；
If monopole current conversion station resumes operation, when another pole current conversion station is out of service, flexible direct current converter station is sent to power station
Signal is controlled, and whether is less than the first threshold of flexible direct current converter station transmission capacity according to the preceding power station active power of failure, really
Determine whether braking resistor puts into；
Otherwise, when bipolar current conversion station is out of service, flexible direct current converter station sends control signal, and wattful power to power station
When rate is reduced to second threshold, the power station controls active output according to control signal, cuts off all Wind turbines.
Preferably, it is described whether to be less than the first of flexible direct current converter station transmission capacity according to the preceding power station active power of failure
Threshold value, determines whether braking resistor puts into, including：
When the preceding power station active power of failure is less than the first threshold of flexible direct current converter station transmission capacity, power station is not put into
Braking resistor；
When the preceding power station active power of failure is higher than the half of flexible direct current converter station transmission capacity, power station is by cutting off wind
The active power in power station is dropped to the first threshold of flexible direct current converter station transmission capacity by the mode of motor group.
It is preferably, described when the active power value of flexible direct current converter station reaches default active power control target value,
Braking resistor, which is exited, according to preset rule completes fault traversing, including：
If power station active power reaches default active power control target value, the braking resistor of input is exited by group,
Complete fault traversing.
Preferably, the first threshold is the half of flexible direct current converter station transmission capacity.
Preferably, the second threshold is 0.
A kind of soft direct sending of isolated island goes out the system failure and passes through control system, and system includes：
Module occurs for failure：For when flexible direct current converter station breaks down, flexible direct current converter station input braking to be electric
Resistance；
Fault clearance module：After fault clearance, flexible direct current converter station sends out control signal, described in the power station receives
Control signal enabling active power controller；
Fault traversing module：Active power value for working as flexible direct current converter station reaches default active power control target
When, it exits braking resistor according to preset rule and completes fault traversing.
Preferably, the failure generation module includes：
Grouped element, for when flexible direct current converter station breaks down, being limited according to flexible direct current converter station needs
Power drafts the total capacity of braking resistor, and according to the total capacity of the braking resistor and the heat dissipation characteristics of resistance material to braking
Resistance is grouped；
Braking resistor unit, for when monopole failure occurs for flexible direct current converter station, flexible direct current converter station to be to braking
Resistance sends control signal, puts into the braking resistor being connect with failure pole；It is soft when bipolar failure occurs for flexible direct current converter station
Property DC converter station to the control signal that all puts into of braking resistor transmission, put into whole braking resistors.
Preferably, the total capacity of the braking resistor is obtained by multigroup resistor coupled in parallel；
The resistance is calculated as follows：
In formula, UmaxFor alternating voltage peak, when new energy power station grid entry point voltage is 220kV, then Umax=1.1*
220kV；PNFor the specified transmission capacity of bipolar flexible DC converter station；PDCIt is actually defeated for bipolar flexible DC converter station during failure
Send capacity, P during monopole failureDCFor PNHalf, P during bipolar failureDCIt is 0；
The resistance that the heat dissipation characteristics of resistance material determine is shown below：
In formula, w represents power；UmaxFor alternating voltage peak；T is fault time.
Preferably, the failure generation module includes：Monopole trouble unit and bipolar trouble unit；
The monopole trouble unit, for when monopole failure occurs for flexible direct current power grid, flexible direct current converter station to be to system
Dynamic resistance sends control signal, and puts into the braking resistor being connect with failure pole；
The bipolar trouble unit, for when bipolar failure occurs for flexible direct current power grid, flexible direct current converter station to be to system
The control signal that dynamic resistance transmission is all put into, puts into whole braking resistors.
Preferably, fault clearance module includes monopole fault clearance unit and bipolar fault clearance unit；
The monopole fault clearance unit sends out control signal for working as flexible direct current converter station after monopole fault clearance,
The power station receives the control signal enabling active power controller；
The bipolar fault clearance unit, after working as bipolar fault clearance, flexible direct current converter station sends out control signal,
The power station receives the control signal enabling active power controller.
Compared with the immediate prior art, the beneficial effects of the invention are as follows：
The present invention provides a kind of soft direct sendings of isolated island to go out system failure traversing control method and system, when soft straight power grid occurs
Failure, puts into braking resistor immediately, and the power that consumption power station is sent out realizes power emergent control in time；
Technical solution provided by the invention after power control reaches requirement, is exited by the way of exiting a group by a group
Braking resistor not only realizes smooth control, reduces the impact to new energy unit and current conversion station, and avoid braking resistor
The prolonged underpower for causing to inject in DC grid that puts into operation, causes DC grid to collapse.
Description of the drawings
The soft direct sending of isolated island that Fig. 1 is the present invention goes out system failure traversing control method flow chart；
The soft direct sending of new energy isolated island that Fig. 2 is the present invention goes out system failure traversing control method flow chart.
Specific embodiment
For a better understanding of the present invention, present disclosure is done further with example with reference to the accompanying drawings of the specification
Explanation.
The present invention provides a kind of soft direct sendings of isolated island to go out system failure traversing control method, as shown in Figure 1, specific as follows：
When flexible direct current converter station breaks down, flexible direct current converter station input braking resistor；
After fault clearance, flexible direct current converter station sends out control signal, and the power station receives the control signal enabling
Active power controller；
When the active power value of flexible direct current converter station reaches default active power control target, according to preset
Rule exits braking resistor and completes fault traversing.
The soft direct sending of isolated island of the present invention goes out system failure traversing control method concrete application as shown in Fig. 2, method includes：
When flexible direct current grid collapses, flexible direct current converter station starts exchange side dynamic braking, input braking electricity
Resistance；It is as shown in table 1 that specific implementation strategy is moved back in active power controller and braking resistor throwing.
Implementation strategy table is moved back in 1 active power controller of table and braking resistor throwing
Dynamic braking is realized based on braking resistor, by the new energy power station that soft straight network system is accessed in new energy isolated island
Braking resistor is installed in side, to consume the active power of new energy power station injection flexible direct current converter station.The function of braking resistor is
New energy power is converted into thermal energy, to realize the purpose of consumption new energy power.Braking resistor is generally by brake unit and electricity
Resistance composition.Brake unit is made of high power transistor GTR and its driving circuit, and function is to flow through resistance for discharge current to carry
For access.When brake unit receives the instruction of energy consumption, control power switch conducting makes new energy power flow through resistance, electricity
Resistance converts electrical energy into thermal energy and discharges heat, constantly consumes new energy power；When brake unit receives the finger for stopping consuming energy
When enabling, control power switch shutdown, at this time without current flowing resistance, resistance natural heat dissipation reduces own temperature；When braking is single
When member receives the instruction of energy consumption again, above procedure is repeated.
When putting into braking resistor：It breaks down in view of DC grid, the grid-connected new energy injection of limitation isolated island is needed to change
Flow the power at station, it is therefore desirable to adjust the capacity of the braking resistor of input in advance, and be grouped.
Braking resistor capacity determines to calculate according to the following formula
Wherein, UmaxFor alternating voltage peak, when new energy power station grid entry point voltage is 220kV, then Umax=1.1*
220kV；PNFor the specified transmission capacity of bipolar flexible DC converter station；PDCIt is actually defeated for bipolar flexible DC converter station during failure
Send capacity, P during monopole failureDCFor PNHalf, P during bipolar failureDCIt is 0.
When electric current flows through resistance, there are heat dissipation problems, may burn out resistance, therefore should be resistant to thermal energy according to resistance maximum
The lower limiting value of resistance is calculated, resistance heating condition is shown below
Above formula is represented that t is taken as fault time with approximate average current.It then can obtain following formula
And then the lower limiting value that resistance is obtained according to resistance material heat dissipation characteristics is shown below
Due to being limited by resistive dissipation condition, resistance value is unsuitable too small, but due to new energy power it is more when, by
Formula (1) is it is found that need smaller resistance, in this case, can only select the mode of grouping, by resistor coupled in parallel obtain needed for
Small resistance value.
For example, when new energy power station grid entry point voltage is 220kV, Umax=1.1*220kV=242kV, it is assumed that bipolar flexible
The rated capacity P of DC converter stationNFor 1500MW, then during bipolar failure, by formula (1) it is found that P during bipolar failureDCIt is 0, at this time
Required R values minimum is about 39.05 ohm, it is assumed that resistive dissipation condition limiting resistance value lower limit is 60 ohm, then needs resistance
Resistor coupled in parallel of the value not less than 60 ohm, with 39.05 ohm of resistance needed for equivalent acquisition.Every group of resistance capacity can basis
The maximum active power shock calculation that flexible direct current converter station allows obtains, such as the maximum allowable active power impact of current conversion station monopole
For 150MW, then the caused active power fluctuation maximum value that exits of every group of resistance is 150MW, by formula (1) it is found that every group of resistance
Value should be 390.5 ohm, needs 10 groups of resistor coupled in parallel in total, resistance value required during most serious failure can be obtained after in parallel
39.05 ohm.
Flexible direct current converter station sends control signal to braking resistor control system, works as flexible direct current according to fault condition
When monopole failure occurs for power grid, flexible direct current converter station sends the control signal of input half to braking resistor, that is, puts into 5 groups,
When bipolar failure occurs for flexible direct current power grid, flexible direct current converter station sends the control signal all put into braking resistor,
Put into 10 groups.The active power that braking resistor input consumption new energy is sent out, reduction are injected into having for flexible direct current converter station
Work(power.
After fault clearance, flexible direct current converter station sends out control signal, and power station, which receives control signal enabling new energy, to be had
Work(power control system；
After the fault clearance of flexible direct current power grid, the amount of flexible direct current converter station power limited situation is it has been determined that open
The active power controller system of dynamic new energy power station, the Precise control for realizing power by real power control system reach current conversion station work(
The requirement of rate injection.
Detailed process is：
(1) it is flexible when failure pole current conversion station resumes operation after fault clearance when flexible direct current power grid generation monopole failure
DC converter station sends control signal to new energy power station active power controller system, keeps active output；When flexible direct current electricity
Monopole failure occurs for net, and after fault clearance, when failure pole current conversion station is out of service, flexible direct current converter station has to new energy power station
Work(power control system sends control signal, and active power is not above the half of flexible direct current converter station transmission capacity, new energy
Source power station controls active output according to control signal, and new energy power station active power is defeated less than flexible direct current converter station before failure
When sending the half of capacity, new energy power station active power controller system is failure to actuate, and new energy power station active power is high before failure
When the half of flexible direct current converter station transmission capacity, new energy power station active power controller system is by cutting off Wind turbines
The active power of new energy power station is dropped to the half of flexible direct current converter station transmission capacity by mode.
(2) it is soft when failure pole current conversion station resumes operation after fault clearance when the bipolar failure of flexible direct current power grid generation
Property DC converter station to new energy power station active power controller system send control signal, keep active output；Work as flexible direct current
Bipolar failure occurs for power grid, flexible when another pole current conversion station is out of service when monopole current conversion station resumes operation after fault clearance
DC converter station sends control signal to new energy power station active power controller system, and active power is changed not above flexible direct current
The half of stream station transmission capacity, new energy power station control active output according to control signal, and new energy power station is active before failure
When power is less than the half of flexible direct current converter station transmission capacity, new energy power station active power controller system is failure to actuate, when event
When new energy power station active power is higher than the half of flexible direct current converter station transmission capacity before barrier, new energy power station active power control
System processed drops to flexible direct current converter station transmission capacity by way of cutting off Wind turbines, by the active power of new energy power station
Half；When bipolar failure occurs for flexible direct current power grid, after fault clearance, when bipolar current conversion station is out of service, flexible direct current
Current conversion station sends control signal to new energy power station active power controller system, and active power is reduced to 0, and new energy power station is according to control
Signal processed controls active output, cuts off all Wind turbines.
System is gradually exited if active power controller system regulation active power value reaches the active power controller target
Dynamic resistance completes fault traversing.
After power control completely in place after, gradually exit braking resistor step by step, i.e., a group by a group exit braking resistor, to the greatest extent
Amount realizes the smooth control of power, reduces the impact to new energy unit and current conversion station, completes fault traversing.
Go out the system failure the invention also includes a kind of soft direct sending of isolated island and pass through control system, system includes：
Module occurs for failure：For when flexible direct current grid collapses, flexible direct current converter station input braking resistor；
Fault clearance module：After working as fault clearance, flexible direct current converter station sends out control signal, and power station receives control
Signal enabling active power controller；
Fault traversing module：For when active power value reaches preset active power controller target, according to setting in advance
Fixed rule exits braking resistor and completes fault traversing.
Failure occurs module and includes：
Grouping module, for when flexible direct current converter station breaks down, being limited according to flexible direct current converter station needs
Power drafts the total capacity of braking resistor, and according to the total capacity of the braking resistor and the heat dissipation characteristics of resistance material to braking
Resistance is grouped；
Braking resistor unit, for when monopole failure occurs for flexible direct current converter station, flexible direct current converter station to be to braking
Resistance sends control signal, puts into the braking resistor being connect with failure pole；It is soft when bipolar failure occurs for flexible direct current converter station
Property DC converter station to the control signal that all puts into of braking resistor transmission, put into whole braking resistors.
The total capacity of the braking resistor is obtained by multigroup resistor coupled in parallel；
The resistance is calculated as follows：
In formula, UmaxFor alternating voltage peak, when new energy power station grid entry point voltage is 220kV, then Umax=1.1*
220kV；PNFor the specified transmission capacity of bipolar flexible DC converter station；PDCIt is actually defeated for bipolar flexible DC converter station during failure
Send capacity, P during monopole failureDCFor PNHalf, P during bipolar failureDCIt is 0；
The resistance that the heat dissipation characteristics of resistance material determine is shown below：
In formula, w represents power；UmaxFor alternating voltage peak；T is fault time.
The failure occurs module and includes：Monopole trouble unit and bipolar trouble unit；
The monopole trouble unit, for when monopole failure occurs for flexible direct current power grid, flexible direct current converter station to be to system
Dynamic resistance sends control signal, and puts into the braking resistor being connect with failure pole；
The bipolar trouble unit, for when bipolar failure occurs for flexible direct current power grid, flexible direct current converter station to be to system
The control signal that dynamic resistance transmission is all put into, puts into whole braking resistors.
Fault clearance module includes monopole fault clearance unit and bipolar fault clearance unit；
The monopole fault clearance unit sends out control signal for working as flexible direct current converter station after monopole fault clearance,
Power station receives control signal enabling active power controller；
The bipolar fault clearance unit, after working as bipolar fault clearance, flexible direct current converter station sends out control signal,
Power station receives control signal enabling active power controller.
The monopole fault clearance unit includes：Restore subelement and exit subelement；
The recovery subelement, after working as monopole fault clearance, when failure pole current conversion station resumes operation, flexible direct current changes
Stream station sends control signal to power station, and power station keeps active output according to control signal；
Described to exit subelement, after working as monopole fault clearance, when failure pole current conversion station is out of service, flexible direct current changes
Whether stream station sends control signal to power station, and defeated less than flexible direct current converter station according to new energy power station active power before failure
The first threshold of capacity is sent to determine whether braking resistor puts into.
The bipolar fault clearance unit includes：Current conversion station restores subelement, monopole current conversion station restores subelement and bipolar
Current conversion station exits subelement；
The current conversion station restores subelement, soft when failure pole current conversion station resumes operation after working as bipolar fault clearance
Property DC converter station send control signal to power station, power station keeps active output；
The monopole current conversion station restores subelement, and after working as bipolar fault clearance, monopole current conversion station resumes operation, another
When pole current conversion station is out of service, flexible direct current converter station sends control signal to power station, and according to the preceding power station active power of failure
The first threshold for whether being less than flexible direct current converter station transmission capacity determines whether braking resistor puts into；
The bipolar current conversion station exits subelement, and after working as bipolar fault clearance, bipolar current conversion station is out of service
When, flexible direct current converter station sends control signal to power station, and when active power is reduced to second threshold, and power station is according to control signal
Active output is controlled, cuts off all Wind turbines.
The monopole current conversion station restores subelement and further includes determination subelement；
The determination subelement includes：When the preceding power station active power of failure is less than the of flexible direct current converter station transmission capacity
During one threshold value, the braking resistor in power station does not put into operation；
When the preceding power station active power of failure is higher than the first threshold of flexible direct current converter station transmission capacity, new energy power station
By way of cutting off Wind turbines, the active power in power station is dropped to the first threshold of flexible direct current converter station transmission capacity.
The fault traversing module includes exiting unit；
Described to exit unit, the active power for working as flexible direct current converter station reaches default active power control target value
When, by the braking resistor of input exiting by group, complete fault traversing.
It should be understood by those skilled in the art that, embodiments herein can be provided as method, system or computer program
Product.Therefore, the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware can be used in the application
Apply the form of example.Moreover, the computer for wherein including computer usable program code in one or more can be used in the application
The computer program production that usable storage medium is implemented on (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The application is with reference to the flow according to the method for the embodiment of the present application, equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that it can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
The processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that the instruction performed by computer or the processor of other programmable data processing devices is generated for real
The device of function specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction generation being stored in the computer-readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps are performed on calculation machine or other programmable devices to generate computer implemented processing, so as in computer or
The instruction offer performed on other programmable devices is used to implement in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
It these are only the embodiment of the present invention, be not intended to restrict the invention, it is all in the spirit and principles in the present invention
Within, any modification, equivalent substitution, improvement and etc. done, be all contained in apply pending scope of the presently claimed invention it
It is interior.
Claims (16)
1. a kind of soft direct sending of isolated island goes out system failure traversing control method, which is characterized in that including：
When flexible direct current converter station breaks down, flexible direct current converter station input braking resistor；
After fault clearance, flexible direct current converter station sends out control signal, and it is active that the power station receives the control signal enabling
Power control；
When the active power value of flexible direct current converter station reaches default active power control target value, according to preset rule
It then exits braking resistor and completes fault traversing.
2. the method as described in claim 1, which is characterized in that when flexible direct current converter station breaks down, flexible direct current changes
Stream station input braking resistor includes：
When flexible direct current converter station breaks down, braking resistor is drafted according to the power that flexible direct current converter station needs limit
Total capacity, and braking resistor is grouped according to the total capacity of the braking resistor and the heat dissipation characteristics of resistance material；
When monopole failure occurs for flexible direct current converter station, flexible direct current converter station sends control signal, input to braking resistor
The braking resistor being connect with failure pole；
When bipolar failure occurs for flexible direct current converter station, flexible direct current converter station sends the control all put into braking resistor
Signal puts into whole braking resistors.
3. method as claimed in claim 2, which is characterized in that the total capacity of the braking resistor includes：By multigroup resistance simultaneously
Connection obtains；
The resistance is calculated as follows：
In formula, UmaxFor alternating voltage peak, when electric station grid connection point voltage is 220kV, then Umax=1.1*220kV；PNIt is double
The specified transmission capacity of pole flexible direct current converter station；PDCFor bipolar flexible DC converter station actual fed capacity, monopole during failure
P during failureDCFor PNHalf, P during bipolar failureDCIt is 0.
4. method as claimed in claim 2, which is characterized in that the resistance that the heat dissipation characteristics of the resistance material determine such as following formula
It is shown：
In formula, w represents power；UmaxFor alternating voltage peak；T is fault time.
5. the method as described in claim 1, which is characterized in that after fault clearance, flexible direct current converter station sends out control letter
Number, the power station receives the control signal enabling active power controller, including：
After monopole fault clearance or after bipolar fault clearance, flexible direct current converter station sends out control signal, and power station receives control
Signal enabling active power controller.
6. method as claimed in claim 5, which is characterized in that after monopole fault clearance, flexible direct current converter station sends out control
Signal processed, power station receive control signal enabling active power controller, including：
After monopole fault clearance, if failure pole current conversion station resumes operation, flexible direct current converter station sends control letter to power station
Number, keep active output；
Otherwise, when failure pole current conversion station is out of service, flexible direct current converter station to power station send control signal, and according to failure before
The first threshold whether power station active power is less than flexible direct current converter station transmission capacity determines whether braking resistor puts into.
7. method as claimed in claim 5, which is characterized in that after bipolar fault clearance, flexible direct current converter station sends out control
Signal processed, power station receive control signal enabling active power controller, including：
After bipolar fault clearance, if failure pole current conversion station resumes operation, flexible direct current converter station sends to power station and controls
Signal, the power station keep active output；
If monopole current conversion station resumes operation, when another pole current conversion station is out of service, flexible direct current converter station sends to power station and controls
Signal, and according to the preceding power station active power of failure whether be less than flexible direct current converter station transmission capacity first threshold, determine system
Whether dynamic resistance puts into；
Otherwise, when bipolar current conversion station is out of service, flexible direct current converter station sends control signal to power station, and active power drops
During for second threshold, the power station controls active output according to control signal, cuts off all Wind turbines.
8. method as claimed in claims 6 or 7, which is characterized in that described whether to be less than according to the preceding power station active power of failure
The first threshold of flexible direct current converter station transmission capacity, determines whether braking resistor puts into, including：
When the preceding power station active power of failure is less than the first threshold of flexible direct current converter station transmission capacity, power station does not put into braking
Resistance；
When the preceding power station active power of failure is higher than the half of flexible direct current converter station transmission capacity, power station is by cutting off wind turbine
The active power in power station is dropped to the first threshold of flexible direct current converter station transmission capacity by the mode of group.
9. the method as described in claim 1, which is characterized in that described when the active power value of flexible direct current converter station reaches pre-
During equipped with work(power control target value, exit braking resistor according to preset rule and complete fault traversing, including：
If power station active power reaches default active power control target value, the braking resistor of input is exited by grouping, it is complete
Into fault traversing.
10. the method as described in claim 6 to 8 is any, which is characterized in that the first threshold is defeated for flexible direct current converter station
Send the half of capacity.
11. the method for claim 7, which is characterized in that the second threshold is 0.
12. a kind of soft direct sending of isolated island goes out the system failure and passes through control system, which is characterized in that system includes：
Module occurs for failure：For when flexible direct current converter station breaks down, flexible direct current converter station to put into braking resistor；
Fault clearance module：After fault clearance, flexible direct current converter station sends out control signal, and the power station receives the control
Signal enabling active power controller；
Fault traversing module：Active power value for working as flexible direct current converter station reaches default active power control target value
When, it exits braking resistor according to preset rule and completes fault traversing.
13. system as claimed in claim 12, which is characterized in that the failure occurs module and includes：
Grouped element, for the power when flexible direct current converter station breaks down, limited according to flexible direct current converter station needs
The total capacity of braking resistor is drafted, and according to the total capacity of the braking resistor and the heat dissipation characteristics of resistance material to braking resistor
It is grouped；
Braking resistor unit, for when monopole failure occurs for flexible direct current converter station, flexible direct current converter station to be to braking resistor
Control signal is sent, puts into the braking resistor being connect with failure pole；It is flexible straight when bipolar failure occurs for flexible direct current converter station
The control signal that stream current conversion station is all put into braking resistor transmission puts into whole braking resistors.
14. system as claimed in claim 13, which is characterized in that the total capacity of the braking resistor is obtained by multigroup resistor coupled in parallel
It arrives；
The resistance is calculated as follows：
In formula, UmaxFor alternating voltage peak, when new energy power station grid entry point voltage is 220kV, then Umax=1.1*
220kV；PNFor the specified transmission capacity of bipolar flexible DC converter station；PDCIt is actually defeated for bipolar flexible DC converter station during failure
Send capacity, P during monopole failureDCFor PNHalf, P during bipolar failureDCIt is 0；
The resistance that the heat dissipation characteristics of resistance material determine is shown below：
In formula, w represents power；UmaxFor alternating voltage peak；T is fault time.
15. system as claimed in claim 12, which is characterized in that the failure occurs module and includes：Monopole trouble unit and
Bipolar trouble unit；
The monopole trouble unit, for when monopole failure occurs for flexible direct current power grid, flexible direct current converter station to be electric to braking
Resistance sends control signal, and puts into the braking resistor being connect with failure pole；
The bipolar trouble unit, for when bipolar failure occurs for flexible direct current power grid, flexible direct current converter station to be electric to braking
Resistance sends the control signal all put into, puts into whole braking resistors.
16. system as claimed in claim 12, which is characterized in that fault clearance module includes monopole fault clearance unit and double
Pole fault clearance unit；
The monopole fault clearance unit sends out control signal for working as flexible direct current converter station after monopole fault clearance, described
Power station receives the control signal enabling active power controller；
The bipolar fault clearance unit, after working as bipolar fault clearance, flexible direct current converter station sends out control signal, described
Power station receives the control signal enabling active power controller.
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