CN110148970B - Fault ride-through control method and system for wind power access flexible direct current power grid - Google Patents
Fault ride-through control method and system for wind power access flexible direct current power grid Download PDFInfo
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- CN110148970B CN110148970B CN201910261453.2A CN201910261453A CN110148970B CN 110148970 B CN110148970 B CN 110148970B CN 201910261453 A CN201910261453 A CN 201910261453A CN 110148970 B CN110148970 B CN 110148970B
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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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- H02J3/386—
-
- 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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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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
Abstract
The application provides a fault ride-through control method and a system for wind power access to a flexible direct current power grid, wherein the fault ride-through control method comprises the following steps: when the direct current power grid fails, starting a power control requirement; during the fault period, the power reversal of the direct current converter station is changed from the access power to the emission power, and the power of the wind turbine generator is locked in an emergency manner; after the fault is recovered, removing surplus wind power, and reversing the power of the direct current converter station from the generated power to the absorbed power; and recovering the output power of the residual wind turbine generator according to the set speed, and completing fault ride-through. According to the application, the control requirement of the ms level of the direct current power grid is considered, the locking rotating speed of the wind turbine generator in the ms level is not overloaded, and the control is simple and effective.
Description
Technical Field
The application relates to the field of new energy power generation, in particular to a fault ride-through control method and system for wind power access to a flexible direct current power grid.
Background
Along with the requirement of energy transformation of various countries in the world, the development of renewable energy sources is becoming the main stream of world energy source development, and the long-distance transportation of large-scale wind power under the condition of no synchronous power supply support is becoming one of the important modes of future new energy source delivery. However, the direct current power grid has different operation and response characteristics with the alternating current power grid, the direct current power grid has no synchronization, so that the time scale of control is different from ms-s level, the wind turbine generator adopts power electronic components, but the power collection and the power delivery of the wind turbine generator are in alternating current mode, and then the wind turbine generator is connected with the direct current power grid, so that the wind turbine generator is difficult to quickly respond to the working condition change of the direct current power grid, when the direct current power grid fails, if a line fails, the wind power capacity of the direct current power grid which needs to be connected with a converter station is possibly reduced, but thousands of wind turbine generator sets in the converter station cannot quickly feel the control requirement under the direct current power grid failure within ms level, the power control is difficult to be timely carried out, the converter station or the line is overloaded, and the whole delivery system is seriously crashed.
Disclosure of Invention
In order to solve the defects in the prior art, the application provides a fault ride-through control method and system for wind power access to a flexible direct current power grid.
The technical scheme provided by the application is a fault ride-through control method of a wind power flexible direct current output system, comprising the following steps: when the direct current power grid breaks down and the power input of the converter station needs to be limited, the power reversal of the converter station can be realized rapidly by setting the high coefficient of the single-pole direct current voltage measurement of the rectifying side to be more than 1.2-1.3, preferably 1.23-1.25 and most preferably 1.23, immediately starting the power emergency control to directly reduce the power to 0 after the wind turbine detects the power reversal, starting the wind turbine for protecting and cutting off surplus power when the fault is recovered, and recovering the output power of the residual wind turbine to a normal value according to a set rate so as to realize fault ride-through.
The application provides a fault ride-through control method for wind power access flexible direct current power grid, which comprises the following steps:
when the direct current power grid fails, starting a power control requirement;
during the fault period, the power reversal of the direct current converter station is changed from the access power to the emission power, and the power of the wind turbine generator is locked in an emergency manner;
after the fault is recovered, removing surplus wind power, and reversing the power of the direct current converter station from the generated power to the absorbed power;
and recovering the output power of the residual wind turbine generator according to the set speed, and completing fault ride-through.
Preferably, the power reversal of the direct current converter station is changed from access power to emission power, and the emergency locking of the power of the wind turbine generator comprises the following steps:
setting a high coefficient of the unipolar direct-current voltage measurement at the rectifying side to exceed a threshold value, so that the power inversion of the direct-current converter station is changed from the access power to the emission power;
and after the wind turbine generator monitors the power reversal of the direct current converter station, controlling the power output to be 0.
Preferably, after the fault recovery, removing the surplus wind power, and reversing the power of the dc converter station from the generated power to the absorbed power, including:
when the direct current power grid is recovered from faults, the effective capacity of the direct current converter station is checked again, and the protection and the removal of surplus wind power are started;
setting a higher coefficient of the rectifying-side unipolar direct-current voltage measurement < threshold value, and changing the power of the converter station from the emitted power to the absorbed power.
Preferably, the threshold value is any one of values between 1.2 and 1.3.
Preferably, the threshold is any one of values between 1.23 and 1.25.
Preferably, the recovering the output power of the remaining wind turbine generator set according to the set rate to complete fault ride-through includes:
and gradually recovering output power of the rest wind turbines according to the set speed, so as to achieve the balance between new energy power output and capacity of the converter station and realize fault ride-through.
Preferably, after the dc power grid fails, before the power control requirement is started, the method further includes:
judging whether the direct current power grid is required to limit the power of the converter station after the fault is removed, if the power of the converter station is required to be limited, starting the power control requirement, otherwise, continuing to monitor whether the direct current power grid is faulty.
Based on the same inventive concept, the application also provides a fault ride-through control system for wind power access to the flexible direct current power grid, which comprises:
the starting module is used for starting the power control requirement when the direct current power grid fails;
the primary inversion module is used for changing the power inversion of the direct current converter station from the access power to the emission power during the fault period, and the power of the wind turbine generator is locked in an emergency manner;
the secondary inversion module is used for cutting off surplus wind power after fault recovery and converting the power of the direct current converter station into absorption power from the emitted power;
and the recovery module is used for recovering the output power of the residual wind turbine generator set according to the set speed to complete fault ride-through.
Preferably, the primary inversion module includes:
the high coefficient increasing unit is used for setting the high coefficient of the rectifying side unipolar direct current voltage measurement to exceed a threshold value so as to change the power inversion of the direct current converter station from the access power to the emission power;
and controlling the wind turbine unit to control the output power to be 0 after the wind turbine unit monitors the power reversal of the direct current converter station.
Preferably, the re-inversion module includes:
the checking unit is used for re-checking the effective capacity of the direct current converter station after the direct current power grid fault is recovered, and starting protection to cut off surplus wind power;
and the high coefficient reducing unit is used for setting a high coefficient of the rectifying side unipolar direct current voltage measurement < threshold value so that the power of the converter station is changed from the emitted power to the absorbed power in a reverse way.
Compared with the prior art, the application has the beneficial effects that:
according to the technical scheme provided by the application, when a direct current power grid fails, the power control requirement is started; during the fault period, the power reversal of the direct current converter station is changed from the access power to the emission power, and the power of the wind turbine generator is locked in an emergency manner; after the fault is recovered, removing surplus wind power, and reversing the power of the direct current converter station from the generated power to the absorbed power; and recovering the output power of the remaining wind turbine generator according to the set rate to complete fault ride-through, and controlling the power inversion of the direct current converter station to realize the fault ride-through of the wind turbine generator under the control time scale of ms level of the direct current power grid so as to avoid overload of the direct current converter station.
According to the technical scheme provided by the application, after the direct current power grid fails, the direct current converter station absorbs power from the wind turbine generator to output power, the wind turbine generator senses that the direct current converter station power is reversed, and power locking control is started until the direct current power grid fails to recover, so that the fault ride-through of the wind power flexible direct current power grid is realized.
According to the technical scheme provided by the application, the control requirement of the ms level of the direct current power grid is considered, the locking rotating speed of the wind turbine generator in the ms level can not be overloaded, and the control is simple and effective.
Drawings
FIG. 1 is a schematic diagram of a conventional flexible DC output system;
FIG. 2 is a flow chart of a fault ride-through control method of the present application;
fig. 3 is a detailed flowchart of a fault-ride-through control method according to an embodiment of the present application.
Detailed Description
For a better understanding of the present application, reference is made to the following description, drawings and examples.
Example 1
The structure of the flexible direct current transmission system is shown in figure 1, and the rated current is U N ，U Pn1 、U Pn2 Positive DC voltages of the rectifying side and the inverting side respectively; u (U) Nn1 、U Nn2 The negative DC voltages of the rectifying side and the inverting side are respectively.
When the positive DC voltage U of the rectifying side in FIG. 1 Pn1 When the measurement is higher, a higher coefficient k is assumed, and the measurement value U is Pn1m And the true value U Pn1 The relation between the two is:
U Pn1m ＝kU Pn1
the positive voltage at the rectifying side is equal to the negative voltage at the inverting side in absolute value due to the clamping action of the connecting neutral point, and the interelectrode voltage is stabilized at 2 times U under the action of the constant direct current voltage controller at the rectifying side N The following steps are:
U Pn1 ＝－U Nn1 ＝2U N /(k+1)
the inter-electrode dc voltage value is:
U dc ＝U Pn1 －U Nn1 ＝4U N /(k+1)
from the above, if the measurement of the rectifying side one-pole DC voltage is higher, i.e. k > 1, the true value of the inter-pole DC voltage will be smaller, and will drop to 0.9 x 2U according to the usual setting requirement N When the system is in an unstable running state, the coefficient critical value is as follows:
k＝4U N /0.9*2U N -1＝1.222
that is, when k > 1.22, the inverter side also enters a constant DC voltage control mode.
Similarly, in the case that both the transmitting end and the receiving end are in constant direct voltage control, in order to continue to maintain the system operation, the magnitudes of d-axis reference values output by the current outer loop control of the rectifying side and the inverting side are required to be equal, and because the parameters of PI controllers of the constant direct voltage control at the two ends are the same, the difference DeltaU between the target value and the measured value of the direct voltage at the two ends can be obtained dc Equally, assuming that the alternating current reference directions at the two ends of the flexible straight are opposite, there are:
ΔU dc ＝(k+1)U Pn1 －2U N ＝0.9*2U N －2U Pn1
then it is possible to obtain:
U Pn1 ＝－U Nn1 ＝3.8U N /(k+3)
finally, the method comprises the following steps:
ΔU dc ＝2U N *(0.9-3.8/(k+3))
thus, corresponding DeltaU dc ΔU due to k > 1.22 dc > 0, indicating that the DC voltage measurement at the rectifying side is greater than 2U N The DC voltage measurement value at the inversion side is less than 0.9 x 2U N The error is accumulated continuously through a direct-current voltage PI controller, the polarity of the d-axis current reference value output by the current outer ring is inverted, and the rectification side is referenced by positive currentThe value is inverted to be negative, and the inversion side is inverted from the negative current reference value to be positive.
Therefore, by analyzing, the converter station power flow reversal can be realized by setting the higher coefficient of the rectifying-side unipolar dc voltage measurement to be more than any one value of 1.2 to 1.3, preferably any one value of 1.23 to 1.25, and most preferably 1.23.
As shown in fig. 2, the wind power access flexible direct current power grid fault ride through control method based on converter station power reversal, provided by the application, comprises the following steps:
I. the direct current power grid fails, and the power control requirement is started;
II. During the fault period, the power reversal of the direct current converter station is changed from the access power to the emission power, and the power of the wind turbine generator is locked in an emergency manner;
III, after the fault is recovered, removing surplus wind power, and reversing the power of the direct current converter station from the generated power to the absorbed power;
and IV, recovering the output power of the residual wind turbine generator according to the set speed, and completing fault ride-through.
As shown in fig. 3, the method specifically includes:
further, in the step I, the dc power grid fails, and the power control requirement is started.
When the direct current power grid fails, the wind turbine generator still outputs power according to the normal state, whether the direct current power grid is used for limiting the power of the converter station after the failure is removed needs to be judged, and if the direct current power grid is required to be limited, starting control is started.
Further, in the step II, during the fault period, the power reversal of the direct current converter station is changed from the access power to the emission power, and the power of the wind turbine generator is locked in an emergency.
Once the control needs to be started, the direct current converter station is required to immediately change the control of the power from absorption to emission, and the converter station is considered to be very difficult to control the power to 0, so that the converter station can be considered not to emit too much power; the wind turbine generator system senses that the power of the direct current converter station is reversed, immediately starts an emergency control power control strategy, and controls the power output to be 0.
Further, in the step III, after the fault recovery, surplus wind power is cut off, and the power of the dc converter station is inverted again to change from the generated power to the absorbed power, including:
and after the direct current power grid fault is recovered, the effective capacity of the direct current converter station is checked again, the protection is started to cut off surplus wind power, and then the power of the converter station is reversed again to change from the emitted power to the absorbed power.
Further, in the step IV, the recovery of the output power of the remaining wind turbine generator set according to the set rate is performed to complete the fault ride-through, including:
and recovering the power of the remaining grid-connected wind turbines according to a certain rate until the power is completely recovered, and achieving the balance between the new energy power output and the capacity of the converter station so as to realize fault ride-through.
Example 2
Based on the same inventive concept, the embodiment also provides a fault ride-through control system for wind power access to a flexible direct current power grid, comprising:
the starting module is used for starting the power control requirement when the direct current power grid fails;
the primary inversion module is used for changing the power inversion of the direct current converter station from the access power to the emission power during the fault period, and the power of the wind turbine generator is locked in an emergency manner;
the secondary inversion module is used for cutting off surplus wind power after fault recovery and converting the power of the direct current converter station into absorption power from the emitted power;
and the recovery module is used for recovering the output power of the residual wind turbine generator set according to the set speed to complete fault ride-through.
In an embodiment, the primary inversion module includes:
the high coefficient increasing unit is used for setting the high coefficient of the rectifying side unipolar direct current voltage measurement to exceed a threshold value so as to change the power inversion of the direct current converter station from the access power to the emission power;
and controlling the wind turbine unit to control the output power to be 0 after the wind turbine unit monitors the power reversal of the direct current converter station.
In an embodiment, the re-inversion module includes:
the checking unit is used for re-checking the effective capacity of the direct current converter station after the direct current power grid fault is recovered, and starting protection to cut off surplus wind power;
and the high coefficient reducing unit is used for setting a high coefficient of the rectifying side unipolar direct current voltage measurement < threshold value so that the power of the converter station is changed from the emitted power to the absorbed power in a reverse way.
In an embodiment, the recovery module includes:
and the recovery unit is used for gradually recovering the output power of the rest wind turbines according to the set rate so as to achieve the balance between the new energy power output and the capacity of the converter station and realize fault ride-through.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing is illustrative of the present application and is not to be construed as limiting thereof, but rather as providing for the use of additional embodiments and advantages of all such modifications, equivalents, improvements and similar to the present application are intended to be included within the scope of the present application as defined by the appended claims.
Claims (12)
1. The fault ride-through control method for wind power access to the flexible direct current power grid is characterized by comprising the following steps of:
when the direct current power grid fails, starting a power control requirement;
during the fault period, the power reversal of the direct current converter station is changed from the access power to the emission power, and the power of the wind turbine generator is locked in an emergency manner;
after the fault is recovered, removing surplus wind power, and reversing the power of the direct current converter station from the generated power to the absorbed power;
restoring the output power of the residual wind turbine generator according to the set speed, and completing fault ride-through;
the power inversion of the direct current converter station is changed from access power to emission power, and the emergency locking of the power of the wind turbine generator comprises the following steps:
setting a high coefficient of the unipolar direct-current voltage measurement at the rectifying side to exceed a threshold value, so that the power inversion of the direct-current converter station is changed from the access power to the emission power;
after the wind turbine generator system monitors the power reversal of the direct current converter station, controlling the power output to be 0;
the high coefficient of the measurement of the unipolar direct current voltage at the rectifying side is the ratio of the measured value to the actual value of the direct current voltage at the positive electrode at the rectifying side.
2. The method of claim 1, wherein, after the fault recovery, removing excess wind power and re-inverting the dc converter station power from the emitted power to the absorbed power comprises:
when the direct current power grid is recovered from faults, the effective capacity of the direct current converter station is checked again, and the protection and the removal of surplus wind power are started;
setting a higher coefficient of the rectifying-side unipolar direct-current voltage measurement < threshold value, and changing the power of the converter station from the emitted power to the absorbed power.
3. A method according to claim 1 or 2, wherein the threshold value is any one of values between 1.2 and 1.3.
4. A method according to claim 3, wherein the threshold is any one of values between 1.23 and 1.25.
5. The method of claim 1, wherein recovering the remaining wind turbine generator output power at the set rate to complete the fault ride-through comprises:
and gradually recovering output power of the rest wind turbines according to the set speed, so as to achieve the balance between new energy power output and capacity of the converter station and realize fault ride-through.
6. The method of claim 1, wherein after the dc grid fails, before the power control requirement is initiated, further comprising:
judging whether the direct current power grid is required to limit the power of the converter station after the fault is removed, if the power of the converter station is required to be limited, starting the power control requirement, otherwise, continuing to monitor whether the direct current power grid is faulty.
7. The utility model provides a wind-powered electricity generation inserts flexible direct current electric wire netting's fault ride-through control system which characterized in that includes:
the starting module is used for starting the power control requirement when the direct current power grid fails;
the primary inversion module is used for changing the power inversion of the direct current converter station from the access power to the emission power during the fault period, and the power of the wind turbine generator is locked in an emergency manner;
the secondary inversion module is used for cutting off surplus wind power after fault recovery and converting the power of the direct current converter station into absorption power from the emitted power;
the recovery module is used for recovering the output power of the residual wind turbine generator set according to the set speed to complete fault ride-through;
the primary inversion module includes:
the high coefficient increasing unit is used for setting the high coefficient of the rectifying side unipolar direct current voltage measurement to exceed a threshold value so as to change the power inversion of the direct current converter station from the access power to the emission power;
the wind turbine generator unit is controlled, and the output power is controlled to be 0 after the wind turbine generator monitors the power reversal of the direct current converter station;
the high coefficient of the measurement of the unipolar direct current voltage at the rectifying side is the ratio of the measured value to the actual value of the direct current voltage at the positive electrode at the rectifying side.
8. The system of claim 7, wherein the re-inversion module comprises:
the checking unit is used for re-checking the effective capacity of the direct current converter station after the direct current power grid fault is recovered, and starting protection to cut off surplus wind power;
and the high coefficient reducing unit is used for setting a high coefficient of the rectifying side unipolar direct current voltage measurement < threshold value so that the power of the converter station is changed from the emitted power to the absorbed power in a reverse way.
9. A system according to claim 7 or 8, wherein the threshold value is any one of values between 1.2 and 1.3.
10. The system of claim 9, wherein the threshold is any one of a number between 1.23 and 1.25.
11. The system of claim 7, wherein the recovery module comprises:
and the recovery unit is used for gradually recovering the output power of the rest wind turbines according to the set rate so as to achieve the balance between the new energy power output and the capacity of the converter station and realize fault ride-through.
12. The system of claim 7, wherein the start-up module is specifically configured to:
when the direct current power grid fails, before the power control requirement is started, the method further comprises the following steps:
judging whether the direct current power grid is required to limit the power of the converter station after the fault is removed, if the power of the converter station is required to be limited, starting the power control requirement, otherwise, continuing to monitor whether the direct current power grid is faulty.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066557A (en) * | 2012-12-10 | 2013-04-24 | 国网智能电网研究院 | Modular multi-level flexible direct current system direct current fault overvoltage restraining method |
| CN108306341A (en) * | 2017-12-21 | 2018-07-20 | 中国电力科学研究院有限公司 | A kind of flexible direct current power grid wind transmitting system fault ride-through method and system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066557A (en) * | 2012-12-10 | 2013-04-24 | 国网智能电网研究院 | Modular multi-level flexible direct current system direct current fault overvoltage restraining method |
| CN108306341A (en) * | 2017-12-21 | 2018-07-20 | 中国电力科学研究院有限公司 | A kind of flexible direct current power grid wind transmitting system fault ride-through method and system |
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