CN108599200A - Urgent limit Poewr control method of the isolated island new energy through very bipolar soft straight power grid access - Google Patents
Urgent limit Poewr control method of the isolated island new energy through very bipolar soft straight power grid access Download PDFInfo
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- 238000013024 troubleshooting Methods 0.000 claims abstract description 7
- 238000004458 analytical method Methods 0.000 claims abstract description 5
- 238000004364 calculation method Methods 0.000 claims description 6
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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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- H02J3/386—
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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
- H02J2003/365—Reducing harmonics or oscillations in HVDC
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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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 provides a kind of urgent limit Poewr control method of isolated island new energy through very bipolar soft straight power grid access, including：Detect DC network operation conditions, judge transmission system whether failure；Failure judgement type, influence of the analysis failure to direct current transportation network and wind field side transverter；It is out-of-limit to perfect pole converter power after the active surplus of DC grid generation or the locking of wind field side transverter monopole, directly changes sending end current conversion station positive and negative anodes transverter trigger signal, reduces modulation wave amplitude, promptly limit power；System restores normal operation after troubleshooting.When the present invention can realize that wind field accesses true bipolar flexible direct current transmission system, urgent limitation wind field output is active, the active surplus of straight-flow system causes overvoltage of direct current so as to cause straight-flow system situation out of service when failure being avoided to occur, and improves flexible direct current power transmission system stability.
Description
Technical field
The invention belongs to electric energy quality monitoring technical fields, are related to a kind of Poewr control method in electric system,
More specifically it is to be related to urgent limit Poewr control method of the isolated island new energy through very bipolar soft straight power grid access to be.
Background technology
In recent years, regenerative resource especially Wind Power Development is swift and violent, and a large amount of regenerative resources access power grid.However for away from
The wind power plant of power grid farther out can cause the technical problems such as grid entry point voltage fluctuation, urgent limit power difficulty through alternating current circuit is grid-connected.
And flexible DC power transmission is wind power plant, especially provides strong support away from the smooth access system of the wind power plant of power grid farther out.
For wind-powered electricity generation is through multiterminal flexible direct current system access power grid lineal system soft to multiterminal, the control strategy of DC voltage
It is most important, this is because soft lineal active surplus/deficiency of uniting can cause DC voltage increase/decrease, and then influence soft straight
The normal operation of system.Since the soft direct-connected passive network connect of multiterminal generally uses permanent alternating voltage amplitude/Phase angle control mode,
Stable power supply is provided for load, therefore the soft straight DC voltage control of multiterminal is generally responsible for by bulk power grid, some control strategies
Also wind power plant can be utilized to participate in DC voltage control.It, can be by multiterminal flexible direct current system according to the difference of DC voltage control strategy
The control strategy of system transverter is divided into:Stand firm DC voltage control, master ＆ slave control, droop control and centerized fusion of monodromy stream is several
Class.
With both-end it is soft it is straight compared with, the conjunction with emergency limit alternative control strategy of power of the soft lineal system of multiterminal containing wind-powered electricity generation compared with
It is more,
But basic thought is soft straight identical as both-end, i.e., defeated by improving grid side current conversion station output power and reduction wind field side
It is excessively high to avoid DC voltage to enter power.
When wind power plant is accessed using flexible DC power transmission mode, if receiving end AC network breaks down, receiving end current conversion station
Power output capacity decline, and wind field side power transmission is substantially unaffected, and so that sending end and receiving end active power is occurred uneven
It weighs, will cause AC line voltage is excessively high to make DC line tripping under serious conditions.Therefore control measure must be taken to make flexibility
DC transmission system can pass through the failure of receiving end AC network, this just needs to solve flexible direct current system promptly to limit power and ask
Topic.
Invention content
To solve the above problems, the invention discloses one kind in true bipolar flexible direct current transportation network, for system event
In the case of barrier, real-time isolated island new energy power grid promptly limits Poewr control method.
In order to achieve the above object, the present invention provides the following technical solutions：
Urgent limit Poewr control method of the isolated island new energy through very bipolar soft straight power grid access, includes the following steps：
1) detect DC network operation conditions, judge transmission system whether failure, when a failure occurs it execute step 2)；
2) failure judgement type, influence of the analysis failure to direct current transportation network and wind field side transverter；
3) pole converter power occurs to perfect after active surplus or the locking of wind field side transverter monopole for DC grid out-of-limit, directly
Modification sending end current conversion station positive and negative anodes transverter trigger signal is connect, modulation wave amplitude is reduced, promptly limits power；System after troubleshooting
Restore normal operation.
Further, the step 1) specifically includes following process：
Moment detects soft straight the connected AC system voltage and current situation of power grid, detects DC grid line voltage distribution electric current feelings
Condition detects current conversion station triggering situation.
Further, the step 2) specifically includes following sub-step：
21) fault type is analyzed, if wind field side current conversion station single machine, which occurs, is latched failure, is transferred to step 22), other failures turn
Enter step 23)；
22) after judging that monopole locking failure occurs, if it is out-of-limit to perfect pole converter power, it is transferred to step 3), if not out-of-limit,
Step 23) is transferred to further to judge；
23) after failure, if the active surplus of DC network, is transferred to step 3).
Further, judge that perfecting the whether out-of-limit specific method of pole converter power is in the step 22)：
Detection wind field confluence active power in real time, according to gained active power value before failure, with the current conversion station monopole change of current
Device capacity compares, active out-of-limit for power more than if single machine transverter transmission capacity if confluence, step 3) is transferred to, if confluence
Point is active, and less than single machine transverter transmission capacity, then power is not out-of-limit, is transferred to step 23) and further judges.
Further, judge that the specific method of the whether active surplus of DC network is in the step 23)：
Detection positive and negative anodes DC network respectively holds converter power to transmit situation in real time, and each end transverter is transmitted active ask
With, under accidental conditions, it is zero respectively to hold the sum of active, the influence after failure according to fault type and fault point to transverter,
Under the conditions of balanced station transverter is not out-of-limit, maximum transfer capacity is reached for its power transmission value, with it with balanced station transverter
He perfects transverter and sums jointly, if result of calculation, which is canonical straight-flow system, active surplus occurs, if result of calculation is negative, directly
Streaming system does not occur active surplus.
Further, in the step 3), the urgent power method that limits includes following sub-step：
31) it cuts off bottom trigger pulse under accidental conditions and generates required modulating wave source；
32) using 0.5 times of accidental conditions modulated wave amplitude as wave amplitude is in emergency circumstances modulated, bottom is introduced
Trigger pulse generates system；
33) post-fault system operating status is detected, system restores normal operation after troubleshooting.
Further, the accidental conditions modulated wave amplitude obtains in the following manner：
Wind-powered electricity generation confluence alternating voltage virtual value is produced, subtracts each other with given alternating voltage reference value, is obtained by PI controllers
Go out and modulates wave amplitude needed for three phase sine wave producer.
Compared with prior art, the invention has the advantages that and advantageous effect：
When can realize that wind field accesses true bipolar flexible direct current transmission system, urgent limitation wind field output is active, avoids event
The active surplus of straight-flow system causes overvoltage of direct current so as to cause straight-flow system situation out of service when barrier occurs, and improves flexible
DC transmission system stability.
Description of the drawings
Fig. 1 is urgent limit power method current conversion station control schematic diagram
Fig. 2 is urgent limit power method flow chart.
Specific implementation mode
Technical solution provided by the invention is described in detail below with reference to specific embodiment, it should be understood that following specific
Embodiment is only illustrative of the invention and is not intended to limit the scope of the invention.
Urgent limit Poewr control method of the isolated island new energy provided by the invention through very bipolar soft straight power grid access, including such as
Lower step：
1) detect DC network working voltage operation conditions, judge transmission system whether failure.Specific method is：
Moment detects soft straight the connected AC system voltage and current situation of power grid, detects DC grid line voltage distribution electric current feelings
Condition detects current conversion station triggering situation, step 2) is transferred to after noting abnormalities.
2) failure judgement type, influence of the analysis failure to direct current transportation network and wind field side transverter；Concrete analysis step
It is rapid include it is following step by step：
21) fault type is analyzed, if wind field side current conversion station single machine, which occurs, is latched failure, is transferred to step 22), other failures turn
Enter step 23)；
22) after judging that monopole locking failure occurs, if it is out-of-limit to perfect pole converter power, it is transferred to step 3), if not out-of-limit,
Step 23) is transferred to further to judge；
In this step, judgement perfects the whether out-of-limit specific method of pole converter power and is：
Detection wind field confluence active power in real time, according to gained active power value before failure, with the current conversion station monopole change of current
Device capacity compares, active out-of-limit for power more than if single machine transverter transmission capacity if confluence, step 3) is transferred to, if confluence
Point is active, and less than single machine transverter transmission capacity, then power is not out-of-limit, is transferred to step 23) and further judges.
23) after failure, if the active surplus of DC network, is transferred to step 3)；
In this step, judge that the specific method of the whether active surplus of DC network is：
Detection positive and negative anodes DC network respectively holds converter power to transmit situation in real time, is flowed into from AC system with active power
Straight-flow system is that just, it is negative that active power flows into AC system from straight-flow system, conveys the active transmission situation in each end in real time, until control
System processed.
Each end transverter is transmitted into active summation, under accidental conditions, it is zero respectively to hold the sum of active, after failure according to therefore
Hinder the influence of type and fault point to transverter under the conditions of balanced station transverter is not out-of-limit to reach most with balanced station transverter
Big transmission capacity is its power transmission value, perfects transverter with other and sums jointly, is gone out if result of calculation is canonical straight-flow system
Existing work(surplus, if result of calculation is negative, straight-flow system does not occur active surplus.
3) pole converter power occurs to perfect after active surplus or the locking of wind field side transverter monopole for DC grid out-of-limit, directly
Modification sending end current conversion station positive and negative anodes transverter trigger signal is connect, modulation wave amplitude is reduced, promptly limits power；System after troubleshooting
Restore normal operation.Urgent limit power method current conversion station control schematic diagram is as shown in Figure 1, its specific rate-determining steps is as shown in Figure 2.
In the step 3) of the method for the present invention, the urgent power method that limits includes following sub-step：
31) it cuts off bottom trigger pulse under accidental conditions and generates required modulating wave source；
32) using 0.5 times of accidental conditions modulated wave amplitude as wave amplitude is in emergency circumstances modulated, bottom is introduced
Trigger pulse generates system；
33) post-fault system operating status is detected, system restores normal operation after troubleshooting.
It is above-mentioned it is urgent limit power specific method be：
Using the turn-on and turn-off of sinusoidal pulse width modulation method control current conversion station IGBT, sinusoidal pulse width modulation control method
Required modulating wave is provided by three phase sine wave producer.
Under accidental conditions, the voltage effective value of wind field access point is constant in order to control, is controlled using feedback to alternating voltage
System.Wind-powered electricity generation confluence alternating voltage virtual value is produced, subtracts each other with given alternating voltage reference value, three-phase is obtained by PI controllers
Wave amplitude is modulated needed for sine-wave generator.The frequency of three phase sine wave producer is set as power frequency, and sets three-phase symmetrical, it can
Obtain converter bridge side three-phase voltage fundametal compoment desired value, i.e. modulating wave needed for sinusoidal pulse width modulation method.
Under fault condition, primary sinusoid modulation ratio signal is cut off, 0.5 times of nominal situation modulated wave amplitude is directly given
Newly to modulate wave amplitude, sine-wave generator is introduced, can be obtained under fault condition, modulating wave needed for sinusoidal pulse width modulation method.
After failure removal, restore nominal situation modulated wave amplitude source, system restores normal operation.
The technical means disclosed in the embodiments of the present invention is not limited only to the technological means disclosed in the above embodiment, further includes
By the above technical characteristic arbitrarily the formed technical solution of combination.It should be pointed out that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (7)
1. the urgent limit Poewr control method that isolated island new energy is accessed through very bipolar soft straight power grid, which is characterized in that including as follows
Step：
1) detect DC network operation conditions, judge transmission system whether failure, when a failure occurs it execute step 2)；
2) failure judgement type, influence of the analysis failure to direct current transportation network and wind field side transverter；
3) pole converter power occurs to perfect after active surplus or the locking of wind field side transverter monopole for DC grid out-of-limit, directly repaiies
Change sending end current conversion station positive and negative anodes transverter trigger signal, reduces modulation wave amplitude, promptly limit power；System is restored after troubleshooting
Normal operation.
2. the urgent limit Poewr control method that isolated island new energy according to claim 1 is accessed through very bipolar soft straight power grid,
It is characterized in that, the step 1) specifically includes following process：
Moment detects soft straight the connected AC system voltage and current situation of power grid, detects DC grid line voltage distribution current conditions, inspection
Survey current conversion station triggering situation.
3. the urgent limit Poewr control method that isolated island new energy according to claim 1 is accessed through very bipolar soft straight power grid,
It is characterized in that, the step 2) specifically includes following sub-step：
21) fault type is analyzed, if wind field side current conversion station single machine, which occurs, is latched failure, is transferred to step 22), other failures are transferred to step
It is rapid 23)；
22) after judging that monopole locking failure occurs, if it is out-of-limit to perfect pole converter power, it is transferred to step 3), if not out-of-limit, is transferred to
Step 23) further judges；
23) after failure, if the active surplus of DC network, is transferred to step 3).
4. the urgent limit Poewr control method that isolated island new energy according to claim 3 is accessed through very bipolar soft straight power grid,
It is characterized in that, judging that perfecting the whether out-of-limit specific method of pole converter power is in the step 22)：
Detection wind field confluence active power in real time is held according to gained active power value before failure with current conversion station monopole transverter
Amount compares, active out-of-limit for power more than if single machine transverter transmission capacity if confluence, step 3) is transferred to, if confluence has
Work(is less than single machine transverter transmission capacity, and then power is not out-of-limit, is transferred to step 23) and further judges.
5. the urgent limit Poewr control method that isolated island new energy according to claim 3 is accessed through very bipolar soft straight power grid,
It is characterized in that, judging that the specific method of the whether active surplus of DC network is in the step 23)：
Detection positive and negative anodes DC network respectively holds converter power to transmit situation in real time, each end transverter is transmitted active summation, just
Under normal operating condition, it is zero respectively to hold the sum of active, and the influence after failure according to fault type and fault point to transverter is balancing
Under the conditions of transverter of standing is not out-of-limit, maximum transfer capacity is reached for its power transmission value with balanced station transverter, is perfected with other
Transverter is summed jointly, if result of calculation, which is canonical straight-flow system, active surplus, if result of calculation is negative, straight-flow system occurs
Do not occur active surplus.
6. the urgent limit Poewr control method that isolated island new energy according to claim 1 is accessed through very bipolar soft straight power grid,
It is characterized in that, in the step 3), the urgent power method that limits includes following sub-step：
31) it cuts off bottom trigger pulse under accidental conditions and generates required modulating wave source；
32) using 0.5 times of accidental conditions modulated wave amplitude as wave amplitude is in emergency circumstances modulated, bottom triggering is introduced
Pulse generates system；
33) post-fault system operating status is detected, system restores normal operation after troubleshooting.
7. the urgent limit Poewr control method that isolated island new energy according to claim 6 is accessed through very bipolar soft straight power grid,
It is characterized in that, the accidental conditions modulated wave amplitude obtains in the following manner：
Wind-powered electricity generation confluence alternating voltage virtual value is produced, subtracts each other with given alternating voltage reference value, three is obtained by PI controllers
Wave amplitude is modulated needed for phase sine-wave generator.
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Cited By (11)
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| CN110323738A (en) * | 2019-06-20 | 2019-10-11 | 国网新疆电力有限公司经济技术研究院 | It is a kind of for determine DC transmission system carrying new energy ability method and system |
| CN110504704A (en) * | 2019-05-24 | 2019-11-26 | 中国电建集团华东勘测设计研究院有限公司 | A kind of bipolar MMC change of current station control system and its control method grid-connected for offshore wind farm |
| CN110783954A (en) * | 2019-10-31 | 2020-02-11 | 中国石油大学(华东) | Method and system for controlling transmission power of island system |
| CN111355255A (en) * | 2020-02-20 | 2020-06-30 | 山东大学 | Virtual modulation-based DC overvoltage suppression method and system after lockout fault |
| CN111509765A (en) * | 2020-01-08 | 2020-08-07 | 中国石油大学(华东) | Fault ride-through control strategy for true-bipolar flexible straight island system under single-pole blocking fault scene |
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| CN110783954B (en) * | 2019-10-31 | 2023-11-07 | 中国石油大学(华东) | Method and system for controlling transmission power of island system |
| CN111509765A (en) * | 2020-01-08 | 2020-08-07 | 中国石油大学(华东) | Fault ride-through control strategy for true-bipolar flexible straight island system under single-pole blocking fault scene |
| CN111355255A (en) * | 2020-02-20 | 2020-06-30 | 山东大学 | Virtual modulation-based DC overvoltage suppression method and system after lockout fault |
| CN111953012B (en) * | 2020-06-29 | 2022-08-19 | 中国电力科学研究院有限公司 | Method and system for restraining AC/DC temporary overvoltage |
| CN111953012A (en) * | 2020-06-29 | 2020-11-17 | 中国电力科学研究院有限公司 | Method and system for restraining AC/DC temporary overvoltage |
| CN113904318A (en) * | 2020-07-06 | 2022-01-07 | 南京南瑞继保电气有限公司 | Calculation and generator tripping distribution method for power surplus margin of direct-current power grid in emergency |
| CN113904318B (en) * | 2020-07-06 | 2024-04-05 | 南京南瑞继保电气有限公司 | Calculation and cut-off distribution method for emergency power surplus of direct-current power grid |
| CN111864783B (en) * | 2020-07-28 | 2022-07-05 | 浙江华云清洁能源有限公司 | Direct-current short-circuit fault ride-through control method and related device |
| CN111864783A (en) * | 2020-07-28 | 2020-10-30 | 浙江华云清洁能源有限公司 | Direct-current short-circuit fault ride-through control method and related device |
| WO2022041365A1 (en) * | 2020-08-26 | 2022-03-03 | 东南大学溧阳研究院 | Power limiting method applicable to voltage source converter |
| CN113098063B (en) * | 2021-04-13 | 2022-07-05 | 东南大学 | New energy island sending alternating current fault ride-through control method and device |
| CN113098063A (en) * | 2021-04-13 | 2021-07-09 | 东南大学 | New energy island sending alternating current fault ride-through control method and device |
| CN117117974A (en) * | 2023-10-24 | 2023-11-24 | 国网浙江省电力有限公司电力科学研究院 | Fault processing method and device for photovoltaic full-direct-current collecting and sending-out system |
| CN117117974B (en) * | 2023-10-24 | 2024-03-29 | 国网浙江省电力有限公司电力科学研究院 | Fault processing method and device for photovoltaic full-direct-current collecting and sending-out system |
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