CN113765093A - Control method and control device for high voltage ride through of variable pitch system of wind turbine generator - Google Patents
Control method and control device for high voltage ride through of variable pitch system of wind turbine generator Download PDFInfo
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- CN113765093A CN113765093A CN202010500877.2A CN202010500877A CN113765093A CN 113765093 A CN113765093 A CN 113765093A CN 202010500877 A CN202010500877 A CN 202010500877A CN 113765093 A CN113765093 A CN 113765093A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000012544 monitoring process Methods 0.000 claims description 8
- 230000000873 masking effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/06—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors
-
- 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
- H02J3/381—Dispersed generators
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention provides a control method and a control device for high voltage ride through of a variable pitch system of a wind turbine generator, wherein the control method comprises the following steps: judging whether a voltage signal of a main power supply on the input side of a variable pitch system of the wind turbine generator set is a high voltage ride through signal or a low voltage ride through signal according to dynamic data of voltage on the network side of a frequency converter; if the voltage signal is a low voltage ride through signal, entering a low voltage ride through mode and executing low voltage ride through control; and if the voltage signal is a high voltage ride through signal, entering a high voltage ride through mode and executing high voltage ride through control. The variable-pitch high-voltage ride-through control method and device for the wind generating set can effectively protect internal devices of the variable pitch, avoid the internal devices of the variable pitch from being burnt due to high voltage, and avoid shutdown caused by fault reporting of a variable-pitch system during high-voltage ride-through, so that high-voltage ride-through failure is caused.
Description
Technical Field
The invention relates to the technical field of control of wind power generation systems, in particular to a control method and a control device for high voltage ride through of a variable pitch system of a wind turbine generator.
Background
With the continuous expansion of the motor capacity and the wind power plant scale of the wind generating set, the safe and stable operation of a power grid under the condition of large-scale wind power centralized access becomes the focus of attention of people. The problem of voltage fault ride-through (low voltage ride-through/high voltage ride-through) of the wind turbine is highly regarded, and the low voltage ride-through capability of the wind turbine generator aiming at grid voltage drop is realized in domestic wind turbines.
The high voltage crossing is a requirement for a specific operation function of the grid-connected wind turbine generator which can still keep grid-connected operation when the grid generates short-time overvoltage. Any disturbance on the high-voltage line can cause the voltage fluctuation of the fan connected to the line, and if the unit has no high-voltage ride-through function, any disturbance on the high-voltage line can cause a large-area fan offline accident, so that the fan connected to the high-voltage line has to have the high-voltage ride-through function.
The pitch control system is used as an important component of the wind generating set and plays important roles of adjusting pitch angle, pneumatic braking and the like. In the conventional transformation of high-voltage ride-through of the variable pitch, a monitoring module is used for monitoring the voltage of a capacitor, during the high-voltage ride-through period, the connection between a power grid and a variable pitch system is cut off, and a backup power supply is adopted for supplying power, so that the normal operation of a unit during the high-voltage ride-through period is guaranteed. However, the existing technology cuts off the connection between the power grid and the variable pitch system, so that the operation efficiency of the wind generating set is low, and the operation and maintenance cost of the system is improved.
Disclosure of Invention
Aiming at the problems, the invention provides a control method and a control device for high voltage ride through of a variable pitch system of a wind turbine generator.
The invention provides a control method for high voltage ride through of a variable pitch system of a wind turbine generator, which comprises the following steps:
judging whether a voltage signal of a main power supply on the input side of a variable pitch system of the wind turbine generator set is a high voltage ride through signal or a low voltage ride through signal according to dynamic data of voltage on the network side of a frequency converter;
if the voltage signal is a low voltage ride through signal, entering a low voltage ride through mode and executing low voltage ride through control;
and if the voltage signal is a high voltage ride through signal, entering a high voltage ride through mode and executing high voltage ride through control.
Further, in the present invention,
performing the high voltage ride through control includes disconnecting a power supply in the pitch system such that the pitch system is powered by a backup power supply.
Further, in the present invention,
performing the high voltage ride through control further comprises masking a fault signal.
Further, still include:
and according to the dynamic data of the voltage at the network side of the frequency converter, performing grading alarm and grading fault treatment.
Further, when the high voltage ride through control is executed, the pitch system is in a high voltage state, and the control method further includes:
it is determined whether the duration T1 of the high voltage state is greater than or equal to a set time T,
if the high-voltage state duration time T1 is less than the set time T, controlling the variable pitch system to be in a high-voltage ride through mode until the high-voltage ride through mode is ended, and then controlling the variable pitch system to enter a normal working mode;
if the high-voltage state duration time T1 is greater than or equal to the set time T, or the wind turbine generator reports a non-shielding fault during the high-voltage ride-through of the variable pitch system, ending the high-voltage ride-through mode of the variable pitch system, controlling the variable pitch system to recover normal power supply, and controlling the wind turbine generator to enter a shutdown mode.
The invention also provides a control device for realizing the control method, the control device comprises a monitoring module and a control module,
the monitoring module is configured to:
judging whether a voltage signal of a main power supply on the input side of a variable pitch system of the wind turbine generator set is a high voltage ride through signal or a low voltage ride through signal according to dynamic data of voltage on the network side of a frequency converter;
if the voltage signal is a low voltage ride through signal, the command informs the control module to enter a low voltage ride through mode to execute low voltage ride through control;
and if the voltage signal is a high voltage ride through signal, the command informs the control module to enter a high voltage ride through mode to execute high voltage ride through control.
Further, in the present invention,
the control module is used for executing the high voltage ride through control, and comprises a power supply which is disconnected in the variable pitch system, so that the variable pitch system is powered by a backup power supply.
Further, in the present invention,
the control module is configured to execute the high voltage ride through control and further includes a shield for shielding a fault signal.
Further, in the present invention,
and the control module is used for carrying out graded alarm and graded fault treatment according to the dynamic data of the voltage at the network side of the frequency converter.
Further, when the high voltage ride through control is executed, the variable pitch system is in a high voltage state,
the control module is used for judging whether the duration time T1 of the high-voltage state is more than or equal to a set time T,
if the high-voltage state duration time T1 is less than the set time T, the control module is used for controlling the variable pitch system to be in a high-voltage ride through mode until the high-voltage ride through mode is finished, and controlling the variable pitch system to enter a normal working mode;
if the high-voltage state duration time T1 is greater than or equal to the set time T, or the wind turbine generator reports a non-shielding fault during the high-voltage ride-through of the pitch control system, the control module is configured to end the high-voltage ride-through mode of the pitch control system, control the pitch control system to recover normal power supply, and control the wind turbine generator to enter a shutdown mode.
The control method and the control device for high voltage ride through of the variable pitch system of the wind turbine generator set can effectively protect internal devices of the variable pitch, avoid the internal devices of the variable pitch from being burnt due to high voltage, and avoid shutdown caused by fault reporting of the variable pitch system during high voltage ride through, so that high voltage ride through failure is caused.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 shows a control method for high voltage ride through of a wind turbine pitch system according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a control device for high voltage ride through of a pitch system of a wind turbine generator according to an embodiment of the invention;
fig. 3 shows a partial circuit topology diagram of a control device for high voltage ride through of a wind turbine pitch system according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 shows a control method for high voltage ride through of a pitch system of a wind turbine generator according to the present invention. As can be seen from fig. 1, the control method includes the steps of:
1. the method comprises the steps of obtaining dynamic data of the voltage of a variable pitch system of the wind turbine generator on the side of a frequency converter network.
2. Judging whether a voltage signal of a main power supply at an input side is a high voltage ride through signal or a low voltage ride through signal according to dynamic data of the voltage at the network side of the frequency converter, and entering a low voltage ride through mode to execute low voltage ride through control if the voltage signal is the low voltage ride through signal; if the signal is a high voltage ride through signal, entering a high voltage ride through mode and executing high voltage ride through control. Typically, in particular, it may be set that the high voltage ride through control is performed when the dynamic data of the converter network side voltage exceeds a predetermined threshold value.
3. Once the high-voltage crossing control is started, the system is in a high-voltage exceptional state, the variable-pitch high-voltage crossing control device needs to be triggered, and a power supply in the variable-pitch system is disconnected, so that the variable-pitch system is in a state of being powered by a backup power supply. Meanwhile, fault signals such as charging faults and backup power faults are shielded.
4. And meanwhile, according to the dynamic data of the voltage at the network side of the frequency converter, carrying out graded alarm and graded fault treatment. According to the national regulations, the wind turbine has different grades for high voltage tolerance, and the wind turbine has different high voltage tolerance time T for different grades. The specific method for processing the hierarchical fault can be referred to the national standard "NB/T31111-2017 wind turbine generator high voltage ride through test procedure" published in 8, 8 and 2 days of 2017.
5. When the high voltage ride through control is executed, the variable pitch system is in a high voltage state, in this step, it is firstly determined whether the duration time T1 of the high voltage state is greater than or equal to a set time T (i.e. a set high voltage withstanding time T),
and if the duration time T1 of the high-voltage state is less than the set time T, controlling the variable pitch system to be in a high-voltage ride through mode until the high-voltage ride through mode is ended, recovering normal power supply, and controlling the variable pitch system to enter a normal working mode.
If the duration time T1 of the high voltage state is greater than or equal to the set time T, or the wind turbine generator reports a non-shielding fault during the high voltage ride through of the variable pitch system, ending the high voltage ride through mode of the variable pitch system, controlling the variable pitch system to recover normal power supply, and entering a shutdown mode.
In summary, when the control method is specifically implemented, whether the wind generating set is controlled to execute the high voltage ride through and finish the high voltage ride through is determined according to the dynamic voltage at the converter network side and the rated voltage output by the wind generating set; during the period of executing high voltage ride through, controlling the wind generating set to enter a high voltage ride through mode, outputting a high voltage ride through signal and disconnecting a power supply in a variable pitch system; and after the high voltage ride through is finished, controlling the wind generating set to exit the high voltage ride through mode, closing a power supply in the variable pitch system and recovering normal power supply.
The invention also provides a control device for realizing the control method for high voltage ride through of the variable pitch system of the wind turbine generator, and the structure of the control device is shown in FIG. 2. As can be seen from fig. 2, the high voltage ride through control device for the pitch system of the wind turbine generator of the present invention includes:
and the monitoring module S1 is configured to execute the step 1-2, or is configured to monitor voltage dynamics at the network side of the frequency converter in real time, determine whether the voltage dynamics is in a high voltage ride through exception state according to the voltage dynamics at the network side of the frequency converter, and instruct the control module to perform corresponding control, and output a high voltage ride through signal to the control device if the detected voltage is greater than a preset threshold.
A Programmable Logic Controller (PLC) module S2 (i.e., a control module) for performing the above steps 3-5, such as receiving the high voltage ride through signal from the monitoring module S1, and processing the high voltage ride through signal to command the relay module S3. The PLC module S2 is also used to receive and store user programs and data, collect status or data sent by the field input device in a scanning manner, and store in a specified register.
And the relay module S3 is used for receiving the master control command of the PLC module S2 and outputting the master control command to the execution module S4.
And an execution module S4, configured to receive the instruction of the PLC module S2, and cut off power supply in the pitch system during the high voltage ride through.
Fig. 3 shows a part of the circuit topology of the control device. In fig. 3, both the backup power supply and the pitch drive are connected to the motor M, which is connected to the pitch drive via DC-and DC-buses. The variable pitch drive is connected with a three-phase power supply through phase lines L1, L2, L3 and a zero line N, wherein contactors are arranged on the phase lines L1, L2 and L3; the phase line L3 and the neutral line N are connected with a contactor A (namely an execution module S4) through a relay (namely a relay module S3), the contactor A is provided with coils A1 and A2, and the relay is provided with normally closed contacts 21 and 22.
The method and the device for controlling the pitch-variable high-voltage ride-through of the wind generating set can effectively protect internal devices of the pitch-variable, avoid the internal devices of the pitch-variable from being burnt due to high voltage, and avoid shutdown caused by fault reporting of a pitch-variable system during high-voltage ride-through, so that high-voltage ride-through failure is caused.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A control method for high voltage ride through of a variable pitch system of a wind turbine generator is characterized by comprising the following steps:
judging whether a voltage signal of a main power supply on the input side of a variable pitch system of the wind turbine generator set is a high voltage ride through signal or a low voltage ride through signal according to dynamic data of voltage on the network side of a frequency converter;
if the voltage signal is a low voltage ride through signal, entering a low voltage ride through mode and executing low voltage ride through control;
and if the voltage signal is a high voltage ride through signal, entering a high voltage ride through mode and executing high voltage ride through control.
2. The method for controlling the high voltage ride through of the pitch system of the wind turbine generator according to claim 1,
performing the high voltage ride through control includes disconnecting a power supply in the pitch system such that the pitch system is powered by a backup power supply.
3. The method for controlling the high voltage ride through of the pitch system of the wind turbine generator according to claim 2,
performing the high voltage ride through control further comprises masking a fault signal.
4. The method for controlling the high voltage ride through of the pitch system of the wind turbine generator set according to claim 3, further comprising:
and according to the dynamic data of the voltage at the network side of the frequency converter, performing grading alarm and grading fault treatment.
5. The method for controlling the high voltage ride through of the pitch system of the wind turbine generator set according to any one of claims 1 to 4, wherein the pitch system is in a high voltage state when the high voltage ride through control is executed, and the method further comprises:
it is determined whether the duration T1 of the high voltage state is greater than or equal to a set time T,
if the high-voltage state duration time T1 is less than the set time T, controlling the variable pitch system to be in a high-voltage ride through mode until the high-voltage ride through mode is ended, and then controlling the variable pitch system to enter a normal working mode;
if the high-voltage state duration time T1 is greater than or equal to the set time T, or the wind turbine generator reports a non-shielding fault during the high-voltage ride-through of the variable pitch system, ending the high-voltage ride-through mode of the variable pitch system, controlling the variable pitch system to recover normal power supply, and controlling the wind turbine generator to enter a shutdown mode.
6. The control device for realizing the control method for the high voltage ride through of the pitch system of the wind turbine generator set according to any one of claims 1 to 5 is characterized by comprising a monitoring module and a control module,
the monitoring module is configured to:
judging whether a voltage signal of a main power supply on the input side of a variable pitch system of the wind turbine generator set is a high voltage ride through signal or a low voltage ride through signal according to dynamic data of voltage on the network side of a frequency converter;
if the voltage signal is a low voltage ride through signal, the command informs the control module to enter a low voltage ride through mode to execute low voltage ride through control;
and if the voltage signal is a high voltage ride through signal, the command informs the control module to enter a high voltage ride through mode to execute high voltage ride through control.
7. The control device for realizing the control method for the high voltage ride through of the pitch system of the wind turbine generator set according to claim 6,
the control module is used for executing the high voltage ride through control, and comprises a power supply which is disconnected in the variable pitch system, so that the variable pitch system is powered by a backup power supply.
8. The control device for realizing the control method for the high voltage ride through of the pitch system of the wind turbine generator set according to claim 7,
the control module is configured to execute the high voltage ride through control and further includes a shield for shielding a fault signal.
9. The control device for realizing the control method for the high voltage ride through of the pitch system of the wind turbine generator set according to claim 8,
and the control module is used for carrying out graded alarm and graded fault treatment according to the dynamic data of the voltage at the network side of the frequency converter.
10. The control device for realizing the control method for the high voltage ride through of the pitch system of the wind turbine generator set according to any one of claims 7 to 9, wherein when the high voltage ride through control is executed, the pitch system is in a high voltage state,
the control module is used for judging whether the duration time T1 of the high-voltage state is more than or equal to a set time T,
if the high-voltage state duration time T1 is less than the set time T, the control module is used for controlling the variable pitch system to be in a high-voltage ride through mode until the high-voltage ride through mode is finished, and controlling the variable pitch system to enter a normal working mode;
if the high-voltage state duration time T1 is greater than or equal to the set time T, or the wind turbine generator reports a non-shielding fault during the high-voltage ride-through of the pitch control system, the control module is configured to end the high-voltage ride-through mode of the pitch control system, control the pitch control system to recover normal power supply, and control the wind turbine generator to enter a shutdown mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010500877.2A CN113765093A (en) | 2020-06-04 | 2020-06-04 | Control method and control device for high voltage ride through of variable pitch system of wind turbine generator |
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| CN202010500877.2A CN113765093A (en) | 2020-06-04 | 2020-06-04 | Control method and control device for high voltage ride through of variable pitch system of wind turbine generator |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105610184A (en) * | 2015-12-02 | 2016-05-25 | 成都阜特科技股份有限公司 | Wind power generating set high voltage ride-through control method |
| CN109787283A (en) * | 2019-02-01 | 2019-05-21 | 国电联合动力技术有限公司 | The control method and device of high voltage crossing |
| CN110138012A (en) * | 2019-06-18 | 2019-08-16 | 天津瑞源电气有限公司 | A kind of high-voltage ride through of wind power generating set control method, device and equipment |
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2020
- 2020-06-04 CN CN202010500877.2A patent/CN113765093A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105610184A (en) * | 2015-12-02 | 2016-05-25 | 成都阜特科技股份有限公司 | Wind power generating set high voltage ride-through control method |
| CN109787283A (en) * | 2019-02-01 | 2019-05-21 | 国电联合动力技术有限公司 | The control method and device of high voltage crossing |
| CN110138012A (en) * | 2019-06-18 | 2019-08-16 | 天津瑞源电气有限公司 | A kind of high-voltage ride through of wind power generating set control method, device and equipment |
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