CN116231856A - Intelligent monitoring method and system for backup power supply of variable pitch system of wind generating set - Google Patents
Intelligent monitoring method and system for backup power supply of variable pitch system of wind generating set Download PDFInfo
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- CN116231856A CN116231856A CN202310047752.2A CN202310047752A CN116231856A CN 116231856 A CN116231856 A CN 116231856A CN 202310047752 A CN202310047752 A CN 202310047752A CN 116231856 A CN116231856 A CN 116231856A
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
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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
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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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
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Human Computer Interaction (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
The invention discloses an intelligent monitoring method and system for a backup power supply of a variable pitch system of a wind generating set. The backup power supply in the variable pitch system consists of the super capacitor module, and the health state of the backup power supply is monitored by a method for calculating the capacitance value of the super capacitor module in real time. The pitch system has two topological modes, one is that a backup power supply runs on line in real time to provide energy for pitch, and the other is that the backup power supply is standby in normal running and runs in a power-down mode. The invention designs the backup power supply capacity value calculation method aiming at the two modes respectively, does not need manual operation, automatically detects the health state of the backup power supply, gives an alarm when the backup power supply is sub-healthy, prompts that the backup power supply module needs to be replaced, and ensures the running safety of the fan.
Description
Technical Field
The invention belongs to the technical field of wind power, and relates to an intelligent monitoring method for a backup power supply of a wind generating set pitch system.
Background
Wind power equipment is a technology intensive strategic emerging industry, and the stability and safety of wind power generation presents challenges to each of its components.
The wind power variable pitch system is used as a control system and a braking system of the fan and bears the dual tasks of control and protection. When the power grid voltage is normal, the fan pitch system is powered by the power grid, and when the power grid is powered down, the backup power supply supplies energy to the pitch system to control the feathering of the blades to a safe position, so that the safety of the fan is ensured. The backup power supply is used as the only power supply measure of the power grid power-down rear pitch system, is a key device for ensuring the safety of the fan under the power-down condition, and if the backup power supply is damaged, the fan cannot be used for emergency feathering, so that serious safety accidents are caused.
In order to ensure the safety of the fan, the health of the backup power supply must be monitored. It has been common practice in the past to access the hub by manually climbing the fan and then manually testing the backup power supply of the pitch system. The testing method is very troublesome, the power generation amount of the fan is lost when the fan is stopped during detection, the time between the two detection is three months to half a year, and the health degree of the backup power supply cannot be detected in real time.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a backup power capacity value testing method for a variable pitch system of a wind turbine generator with automatic detection and short period.
The invention adopts the following technical scheme.
On the one hand, the patent provides an intelligent monitoring method for a backup power supply of a variable pitch system of a wind generating set, which comprises the following steps:
step 1: determining a backup power supply working mode in a current pitch system;
step 2: calculating a backup power capacity value according to the backup power working mode;
step 3: for the capacity value of the backup power supply, if the capacity value is lower than n times of the system design capacity value, an over-low capacity value alarm is sent, and if the capacity value is greater than m times of the system design capacity value, an over-high capacity value alarm is sent, and m is greater than n.
Further, the backup power supply working mode comprises a backup power supply real-time on-line mode and a backup power supply is a backup mode when the system operates.
In step 2, when the working mode adopts the real-time on-line mode of the backup power supply, the fan is in grid-connected operation for changing the pitch, the charging machine of the pitch changing system and the backup power supply simultaneously provide energy for the system, and at the moment, a part of the output current of the charging machine charges the backup power supply and a part of the output current of the charging machine supplies power for the pitch changing driver.
Further, the variable pitch system has current wind speed data, and when the fan is stopped normally due to low wind speed, the system automatically enters a capacity calculation mode; the variable pitch controller monitors a main control command in real time, and immediately exits the capacity calculation mode to enter the operation mode when the main control position control command changes, or else waits for the capacity detection to be completed and exits the capacity calculation mode.
Further, when the variable pitch system receives a normal shutdown instruction of the fan, the charger is turned off, relevant variable pitch faults are shielded at the moment, the energy of the backup power supply is utilized for feathering, and the voltage of the backup power supply can drop.
Further, after the variable pitch reaches the motor band-type brake at the safe position, the variable pitch system records the voltage of the backup power supply at the moment as the initial voltage, starts the charger to charge the backup power supply until the charging is completed, takes the voltage as the cut-off voltage, cancels fault shielding, and records the charging current and the charging time in the charging process.
In step 2, when the standby power supply is in the standby mode during the operation of the system in the working mode, the charging machine of the pitch control system does not operate during the normal operation, the charging machine is started after the voltage of the standby power supply drops to the design threshold value, the voltage when the charging machine is started is used as the starting voltage, the voltage after the charging of the standby power supply of the pitch control system is completed is used as the cut-off voltage, and the charging current and the charging time in the charging process are recorded.
Further, the capacity value of the super capacitor module in the step 2 is calculated as follows:
the theoretical calculation formula of the capacitance value is as follows: c=q/U;
wherein C: capacitance, unit F (farad), Q: charge amount, unit (coulomb), U: a voltage;
the charge amount calculation formula is: q=i×t;
wherein i: current, t: time;
the final capacitance value calculating method comprises the following steps:
wherein i: backup power supply charging current, t: the charging time of the backup power supply;
U 1 : backup power supply charging cut-off voltage, U 2 : the backup power source charges the initial voltage.
Further, the value of n is 0.6, and the value of m is 1.3.
On the other hand, the patent provides an intelligent monitoring system for the backup power supply of the variable pitch system of the wind generating set, which is used for realizing the intelligent monitoring method for the backup power supply of the variable pitch system of the wind generating set.
Compared with the prior art, the method has the advantages that the capacity value of the backup power supply is calculated through the process of charging and discharging the backup power supply, the voltage value of the backup power supply is monitored, the capacity value of the backup capacitor is monitored, the calculation is automatically completed through the control system, the period is short, the precision is high, and the backup power supply is not required to be manually detected by extra shutdown investment manpower. Maintenance personnel only need to pay attention to the backup power capacity value alarm information of the variable pitch system. Such a method is more convenient and accurate than conventional methods, both from a field maintenance point of view and from a technical point of view.
Drawings
FIG. 1 is a schematic flow chart of a method for intelligently monitoring a backup power supply of a variable pitch system of a wind turbine generator system.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described herein are merely some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art without inventive faculty, are within the scope of the invention, based on the spirit of the invention.
As shown in fig. 1, the invention provides an intelligent monitoring method for a backup power supply of a variable pitch system of a wind generating set, which comprises the following steps:
step 1: determining a backup power supply working mode in a current pitch system; the backup power supply working mode comprises a backup power supply real-time on-line mode and a backup power supply is a backup mode when the system operates.
Step 2: calculating a backup power capacity value according to the backup power working mode;
when the working mode adopts a standby power supply real-time on-line mode, the fan is connected with a grid to run for changing the pitch, a charging machine of the pitch changing system and the standby power supply simultaneously provide energy for the system, at the moment, a part of output current of the charging machine charges the standby power supply, a part of output current of the charging machine supplies power for the pitch changing driver, and the capacity value of the standby power supply cannot be accurately calculated during the grid connection;
the variable pitch system has current wind speed data, and when the fan is stopped normally due to low wind speed, the system automatically enters a capacity value calculation mode; the variable pitch controller monitors a main control command in real time, and immediately exits the capacity calculation mode to enter the operation mode when the main control position control command changes, or else waits for the capacity detection to be completed and exits the capacity calculation mode.
The method comprises the steps that when a variable pitch system receives a normal shutdown instruction of a fan, a charger is turned off, relevant variable pitch faults are shielded at the moment, the energy of a backup power supply is utilized to feathere, the voltage of the backup power supply drops, after the variable pitch reaches a motor band-type brake at a safe position, the variable pitch system records the voltage of the backup power supply at the moment as an initial voltage, and then the charger is turned on to charge the backup power supply until charging is completed;
preferably, the charger is started after the standby power supply voltage drops by more than 20V;
recording the voltage at the moment as cut-off voltage, canceling fault shielding, and recording charging current and charging time in the charging process;
the capacity value of the super capacitor module is calculated as follows:
the theoretical calculation formula of the capacitance value is as follows: c=q/U;
wherein C: capacitance, unit F (farad), Q: charge amount, unit (coulomb), U: a voltage;
the charge amount calculation formula is: q=i×t;
wherein i: current, t: time;
the final capacitance value calculating method comprises the following steps:
wherein i: backup power supply charging current, t: the charging time of the backup power supply;
U 1 : backup power supply charging cut-off voltage, U 2 : the backup power source charges the initial voltage.
When the working mode adopts a standby power supply to be a standby mode during system operation, a variable pitch system charger does not operate during normal operation, and the charger is started after the voltage of the standby power supply automatically drops to a design threshold value;
preferably, the value of the design threshold is 430V;
the voltage is used as an initial voltage when a charger is started, the voltage is used as a cut-off voltage after the backup power supply of the variable pitch system is charged, and charging current and charging time in the charging process are recorded;
the capacity value of the super capacitor module is calculated as follows:
the theoretical calculation formula of the capacitance value is as follows: c=q/U;
wherein C: capacitance, unit F (farad), Q: charge amount, unit (coulomb), U: a voltage;
the charge amount calculation formula is: q=i×t.
Wherein i: current, t: time;
the final capacitance value calculating method comprises the following steps:
wherein i: backup power supply charging current, t: the charging time of the backup power supply;
U 1 : backup power supply charging cut-off voltage, U 2 : the backup power source charges the initial voltage.
Step 3: the capacity value of the backup power supply is calculated through the steps, if the capacity value is lower than 0.6 times of the capacity value of the system design, an over-low capacity value alarm is sent, and if the capacity value is higher than 1.3 times of the capacity value of the system design, an over-high capacity value alarm is sent. And fan maintenance personnel timely replace the fault backup power supply according to the backup power supply alarm information of the variable pitch system, so that the safety of the fan is ensured.
Example 1:
a variable pitch system of a 5 XMW wind turbine generator is characterized in that a backup power supply is in a second working mode, the design capacity value of the backup power supply is 2 Farad (F), the rated voltage of the backup power supply is 450 volts (V), and a charger is automatically started to be fully charged after the backup power supply automatically drops to 430 volts;
in normal operation of the system, the pitch controller detects that the backup power supply voltage drops to 430V, charging is started at the moment, the charging current is set to be constant current of 2 amperes (A), and the backup power supply voltage when the charging current is 1.9A rising edge is recorded as the initial voltage U 2 The initial voltage is 431.5V, and the charge amount calculation formula is q=i×t. Wherein i: current, t: time. The pitch controller calculates the amount of charge according to the above formula: since the controller runs on a period of 10 milliseconds (ms), the charge accumulation algorithm is to sum the current feedback value per cycle times the time.
When the backup power supply voltage is charged quickly, the charging current gradually becomes 0, and the backup power supply voltage when the charging current is 1.9A falling edge is recorded as the cut-off voltage U 1 The cutoff voltage was 448.7V and the charge amount integration value was 33.54 coulomb (C). According to the formula
Available->
The calculated capacity value of the backup power supply is 1.95 coulombs, and in a normal range, the capacity value is normal, and the backup power supply is healthy.
Compared with the prior art, the method has the advantages that the capacity value of the backup power supply is calculated through the process of charging and discharging the backup power supply, the voltage value of the backup power supply is monitored, the capacity value of the backup capacitor is monitored, the calculation is automatically completed through the control system, the period is short, the precision is high, and the backup power supply is not required to be manually detected by extra shutdown investment manpower. Maintenance personnel only need to pay attention to the backup power capacity value alarm information of the variable pitch system. Such a method is more convenient and accurate than conventional methods, both from a field maintenance point of view and from a technical point of view.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (10)
1. An intelligent monitoring method for a backup power supply of a variable pitch system of a wind generating set is characterized by comprising the following steps:
step 1: determining a backup power supply working mode in a current pitch system;
step 2: calculating a backup power capacity value according to the backup power working mode;
step 3: for the capacity value of the backup power supply, if the capacity value is lower than n times of the system design capacity value, an over-low capacity value alarm is sent, and if the capacity value is greater than m times of the system design capacity value, an over-high capacity value alarm is sent, and m is greater than n.
2. The intelligent monitoring method for the backup power supply of the variable pitch system of the wind generating set, according to claim 1, is characterized by comprising the following steps:
the backup power supply working mode comprises a backup power supply real-time on-line mode and a backup power supply is in a standby mode when the system operates.
3. The intelligent monitoring method for the backup power supply of the variable pitch system of the wind generating set, according to claim 1, is characterized by comprising the following steps:
in the step 2, when the working mode adopts a standby power supply real-time on-line mode, the fan is connected with a grid to operate to change the pitch, the charging machine of the pitch changing system and the standby power supply simultaneously provide energy for the system, and at the moment, a part of the output current of the charging machine charges the standby power supply and a part of the output current of the charging machine supplies power for the pitch changing driver.
4. The intelligent monitoring method for the backup power supply of the variable pitch system of the wind generating set according to claim 3, wherein the method comprises the following steps of:
the variable pitch system has current wind speed data, and when the fan is stopped normally due to low wind speed, the system automatically enters a capacity value calculation mode; the variable pitch controller monitors a main control command in real time, and immediately exits the capacity calculation mode to enter the operation mode when the main control position control command changes, or else waits for the capacity detection to be completed and exits the capacity calculation mode.
5. The intelligent monitoring method for the backup power supply of the variable pitch system of the wind generating set, according to claim 4, is characterized by comprising the following steps:
and when the variable pitch system receives a normal shutdown instruction of the fan, the charger is turned off, relevant variable pitch faults are shielded at the moment, the energy of the backup power supply is utilized for feathering, and the voltage of the backup power supply can drop.
6. The intelligent monitoring method for the backup power supply of the variable pitch system of the wind generating set, according to claim 5, is characterized by comprising the following steps:
after the variable pitch reaches the motor band-type brake at the safe position, the variable pitch system records the voltage of the backup power supply at the moment as the initial voltage, starts the charger to charge the backup power supply until the charging is completed, takes the voltage as the cut-off voltage, cancels fault shielding, and records the charging current and the charging time in the charging process.
7. The intelligent monitoring method for the backup power supply of the variable pitch system of the wind generating set according to claim 1 is characterized by comprising the following steps:
in step 2, when the standby power supply is in a standby mode in the working mode, the charging machine of the pitch control system does not operate in the normal operation, the charging machine is started after the voltage of the standby power supply drops to a design threshold value, the voltage when the charging machine is started is used as an initial voltage, the voltage after the charging of the standby power supply of the pitch control system is completed is used as a cut-off voltage, and the charging current and the charging time in the charging process are recorded.
8. The intelligent monitoring method for the backup power supply of the pitch system of the wind generating set according to claim 6 or 7, wherein the intelligent monitoring method is characterized by comprising the following steps of;
the capacity value of the super capacitor module in the step 2 is calculated as follows:
the theoretical calculation formula of the capacitance value is as follows: c=q/U;
wherein C: capacitance, unit F (farad), Q: charge amount, unit (coulomb), U: a voltage;
the charge amount calculation formula is: q=i×t;
wherein i: current, t: time;
the final capacitance value calculating method comprises the following steps:
wherein i: backup power supply charging current, t: the charging time of the backup power supply;
U 1 : backup power supply charging cut-off voltage, U 2 : the backup power source charges the initial voltage.
9. The intelligent monitoring method for the backup power supply of the variable pitch system of the wind generating set according to claim 1 is characterized by comprising the following steps:
the value of n is 0.6, and the value of m is 1.3.
10. A wind generating set becomes oar system backup power supply intelligent monitoring system, its characterized in that:
the system is used for realizing the intelligent monitoring method of the backup power supply of the variable pitch system of the wind generating set according to any one of claims 1 to 9.
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| CN202310047752.2A CN116231856A (en) | 2023-01-31 | 2023-01-31 | Intelligent monitoring method and system for backup power supply of variable pitch system of wind generating set |
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| CN202310047752.2A CN116231856A (en) | 2023-01-31 | 2023-01-31 | Intelligent monitoring method and system for backup power supply of variable pitch system of wind generating set |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113991771A (en) * | 2021-10-08 | 2022-01-28 | 许昌学院 | Variable pitch system super capacitor charger early warning method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113991771A (en) * | 2021-10-08 | 2022-01-28 | 许昌学院 | Variable pitch system super capacitor charger early warning method |
| CN113991771B (en) * | 2021-10-08 | 2024-03-08 | 许昌学院 | Pre-warning method for super-capacitor charger of pitch system |
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