WO2014051175A1 - Dispositif et procédé pour l'alimentation continue à basse tension de générateur d'énergie éolienne - Google Patents

Dispositif et procédé pour l'alimentation continue à basse tension de générateur d'énergie éolienne Download PDF

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Publication number
WO2014051175A1
WO2014051175A1 PCT/KR2012/007825 KR2012007825W WO2014051175A1 WO 2014051175 A1 WO2014051175 A1 WO 2014051175A1 KR 2012007825 W KR2012007825 W KR 2012007825W WO 2014051175 A1 WO2014051175 A1 WO 2014051175A1
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Prior art keywords
power
energy storage
storage device
wind
generator
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PCT/KR2012/007825
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English (en)
Korean (ko)
Inventor
강정욱
채재훈
정태훈
Original Assignee
주식회사 메가베스
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Priority to PCT/KR2012/007825 priority Critical patent/WO2014051175A1/fr
Publication of WO2014051175A1 publication Critical patent/WO2014051175A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/028—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling wind motor output power
    • F03D7/0284—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling wind motor output power in relation to the state of the electric grid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
    • F03D9/20—Wind motors characterised by the driven apparatus
    • F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
    • F03D9/255—Wind motors characterised by the driven apparatus the apparatus being an electrical generator connected to electrical distribution networks; Arrangements therefor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/007—Control circuits for doubly fed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2101/00—Special adaptation of control arrangements for generators
    • H02P2101/15—Special adaptation of control arrangements for generators for wind-driven turbines
    • 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

Definitions

  • the present invention relates to a low voltage accommodating operation apparatus and method of a wind power generator, and more particularly, a system low voltage accommodating operation of a wind power generator using a bidirectional power converter and an energy storage device can be easily performed, and to improve wind power generation quality.
  • the present invention relates to a low voltage accommodating driving apparatus and method of a wind power generator.
  • the low voltage acceptance operation maintains the connected state without disconnecting the wind power generation from the grid within a predetermined time even when a momentary low voltage condition occurs in the grid, and at a point when the system recovers from the instantaneous low voltage status. It is to send power to the system to perform an operation that contributes to the system recovery.
  • the low voltage acceptance operation function includes a system voltage of a system at which an instantaneous low voltage of the system is in a steady state. It is the ability to operate for 0.625 seconds up to the% level and maintain the grid connection status when the steady state grid voltage recovers more than 90% for up to 3 seconds.
  • LVRT low voltage operation
  • Conventional known low voltage operation (LVRT) methods use Operation at reduced speed / load, variable dc buses and use of derated converters to operate at high currents. with more variable dc bus and higher currents, Additional capacitors on the dc bus, Active crowbar, Energy discharge, and the torque value applied to the generator Changing methods have been applied, and these methods basically use wind turbines to reduce the amount of power generated or consume the generated energy through loads such as resistors.
  • the conventional low voltage accommodation operation method has a very complicated structure due to the method of responding without stopping the wind generator fundamentally, there is a problem that requires a mechanical or electrical modification for the existing wind turbine. .
  • a method of sending only a part of the generated energy to the system without stopping the wind power generator and storing the rest in the energy storage device (ESS) may be applied. Because of the need to fit the wind power generation capacity, there is a cost and technical limitations, such as eventually to increase the capacity of the energy storage (ESS).
  • the current controller gain value according to the wind turbine inductance conversion before and after the grid connection plays an important role for stable grid input.
  • Wind generators using the Double Fed Induction Generation control the stator voltage by controlling the rotor current, and the controlled stator voltage is linked to the grid.
  • DFIG Double Fed Induction Generation
  • the internal parameter values of the generator will fluctuate. This may affect the current controller gain value of the MSC (Machine Side Converter) based on the generator parameters before the grid is energized, resulting in unstable current control.
  • the current control of the MSC side is unstable as the current control of the rotor becomes unstable due to Low Voltage Ride Through (LVRT) generated by the grid. This can cause equipment burnout.
  • LVRT Low Voltage Ride Through
  • the cause of the low voltage acceptance operation is caused by a ground fault in the system and a sudden voltage drop of the system.
  • the wind generator using the double-fed induction generation has an output terminal of the wind generator connected to a grid connected to TR.
  • the method of reducing the generator output by controlling the torque of the generator may be the most effective method of reducing the generator output through the pitch control, but the physical response of the pitch to a short low voltage of several hundreds [ms], such as low voltage acceptance operation
  • the disadvantage is that it is too slow.
  • the method using the active crowbar should be capable of sufficient energy control to control the surplus energy generated by the crowbar, but there is a problem that the power control semiconductor is burned out due to the energy control limit.
  • the present invention has been studied in view of the above-mentioned problems in the prior art, the generation of the wind power generator when a low voltage below a certain level in the system stops the power generation at the same time using the power converter and energy storage device (ESS) toward the system
  • LVRT low voltage acceptance operation
  • Another object of the present invention is to charge and discharge wind energy by using a power converter (PCS) and an energy storage device (ESS) even in a low voltage acceptance operation (LVRT) situation in which there is no low voltage generation below a certain level in the system.
  • PCS power converter
  • ESS energy storage device
  • LVRT low voltage acceptance operation
  • Wind turbine driving apparatus for achieving the above object is a system for low voltage acceptance operation, the blade is mounted on a rotatable shaft to produce rotational energy from the wind; A generator for generating electric power from the rotational energy of the blades; A power converter for converting the electric power produced by the generator into electric power of a form suitable for supplying a system connected to the wind turbine; A power converter including a DC / DC or an AC / DC bidirectional converter depending on the installation position to randomly charge and discharge the power of the energy storage device; An energy storage device connected to the power converter to supply power to the system when the voltage of the system falls below a predetermined level; Characterized in that configured to include.
  • Wind turbine driving method for achieving the above object is for the low voltage acceptance operation of the system, when the voltage of the system falls below a certain level, the first generation of the wind turbine at the first point Discontinuing operation and simultaneously applying power supply from the energy storage system to the grid; Preparing power supply from the energy storage device to the system from the first time point to a second time point at which the voltage of the system starts to rise; Starting to supply power from the energy storage device to the system until a third time point, when the voltage of the system is normally restored; Monitoring whether the voltage of the system has returned to a normal state and restarting the wind generator if it is determined that the voltage of the system has returned to the normal state; Supplying power from the energy storage system to the grid until a fourth time point when the output of the wind power generator reaches a normal level; Characterized in that it comprises a.
  • Wind turbine driving apparatus for achieving the above object is a system for low voltage acceptance operation, the blade is mounted on a rotating shaft to produce rotational energy from the wind, and to generate power from the rotational energy of the blade
  • a wind turbine generator comprising a generator and a power converter for converting the power produced by the generator into a power suitable for supplying the grid
  • the main switch is installed between the power converter and the grid of the wind turbine
  • the first energy storage device is connected between the converter and the main switch by the first switch
  • the second energy storage device is connected by the second switch between the main switch and the grid.
  • Wind generator operation method for achieving the above object is for the low voltage acceptance operation of the system, when the voltage of the system falls below a predetermined size, the opening of the main switch installed between the system and the wind turbine and Simultaneously stopping the power generation operation of the wind turbine;
  • the second switch is turned on so that power of the second energy storage device is supplied to the grid during the low voltage receiving operation period;
  • the grid voltage reaches a steady state, maintaining the first switch on to restart the wind power generator and supplying reactive power from the first energy storage device to the wind power generator;
  • the first energy storage device and the second energy storage device may implement an operation for stabilizing power quality.
  • the present invention provides the following effects.
  • a low voltage below a certain level occurs in a system in which a wind generator (small) is connected
  • power generation of the wind generator is stopped, and power is supplied using an energy storage device (ESS) including a power converter (PCS).
  • ESS energy storage device
  • PCS power converter
  • the energy storage device (ESS) including the power conversion device (PCS) according to the present invention has the advantage that can be applied to the existing wind turbine as well as a new wind generator.
  • the present invention can greatly reduce the capacity of the energy storage device (ESS) because it utilizes the discharge capacity of the energy storage device (ESS).
  • FIG. 1 is a diagram illustrating a low voltage acceptance operation (LVRT) function required for a wind power generator (small) when a momentary low voltage is generated in a system.
  • LVRT low voltage acceptance operation
  • FIG. 2 is a block diagram illustrating an example of installing an energy storage device (ESS) including a power conversion device (PCS) according to an embodiment of the present invention as a separate device between a wind generator and a grid;
  • ESS energy storage device
  • PCS power conversion device
  • FIG. 3 is a block diagram of installing an energy storage device (ESS) including a power conversion device (PCS) according to an embodiment of the present invention inside a power converter included in a wind turbine;
  • ESS energy storage device
  • PCS power conversion device
  • FIG. 4 is a detailed view of a wind turbine including an energy storage device (ESS) including a power conversion device (PCS) according to an embodiment of the present invention
  • FIG. 5 is a graph for explaining a method of discharging power to a grid in an energy storage device including a power conversion device (PCS) according to an embodiment of the present invention
  • PCS power converter
  • FIG. 7 is a schematic view showing a wind power generator using a double excitation method
  • FIG. 8 is a schematic view showing an example of a low voltage accommodating driving device of a wind turbine according to another embodiment of the present invention.
  • FIG. 9 is a view illustrating an operation of a first switch B1 and a second switch B2 according to an opening of a main switch and a first time with respect to a time axis of the low voltage accommodating and operating device of a wind power generator according to another embodiment of the present invention. And charge and discharge characteristics of the second energy storage devices ESS-1 and ESS-2.
  • FIG. 10 is a flowchart illustrating a low voltage acceptance driving method according to another embodiment of the present invention.
  • Low voltage acceptance operation (LVRT) method of the wind power generator according to the present invention is based on the existing concept that the wind power generator or wind power plant maintains the power generation state for a certain period of time while maintaining a system linkage when a low voltage below a certain level occurs in the system. Rather than focusing on the system, if the system generates a low voltage below a certain level, the grid connection is maintained but the wind turbine is stopped and the system is powered by using an energy storage device (ESS) instead of the wind power generation. The main focus is on meeting the needs.
  • ESS energy storage device
  • the present invention is to provide a system low-voltage receiving operation apparatus that can be applied to the existing wind turbine (small), as well as a new wind generator (small), generated in the wind generator (small) connected to the grid
  • An energy storage device including a two-way power conversion system (PCS) that can charge and discharge electricity is installed between the system and the wind power plant.
  • PCS power conversion system
  • Another point is to meet the requirements of Low Voltage Ride Through (LVRT), which is required for the system, and to maximize the power quality from wind power generation.
  • LVRT Low Voltage Ride Through
  • the system low voltage acceptance operation apparatus of the wind turbine includes a blade 12 mounted on a rotatable shaft and producing rotational energy from the wind;
  • the generator 14 generates electric power from the rotational energy of the blade 12 and converts the electric power produced by the generator 14 into a power suitable for supplying the system 30 connected to the wind turbine 10.
  • a power converter 16 (PCS: Power Conversion System) including a DC / DC or AC / DC bidirectional converter depending on the installation position to randomly charge and discharge electric power to the energy storage device, It is configured to include an energy storage device 20 (ESS: Energy Storage System) connected to the power converter 22.
  • the generator 14 generates electric power from the rotational energy of the blade 12, and the generated electric power is in the form of AC, but is not suitable to be directly supplied to the system, so that the power converter 16 generates the generator 14.
  • the power produced by is converted into a power of a form suitable for supplying the system 30 associated with the wind turbine (10).
  • the power converter 16 is an AC / DC converter 24 for converting the AC power produced by the generator 14 to DC, as shown in the accompanying FIG. DC / AC inverter 26 to convert to appropriate AC power.
  • the power converter 16 is not included in the fixed speed type (Fixed Speed Type) according to the characteristics of the wind generator, and corresponds to about 30% of the capacity of the wind generator in the double-fed induction generation (DFIG) Only the power converter capacity is connected to the rotor, and the direct drive method (WRSG: Wound Rotor Synchronous Generator & PMSG: Permanent Magnetic Synchronous Generator) includes power converter capacity capable of handling 100% of the wind turbine capacity.
  • Fixed Speed Type the fixed speed type
  • DFIG double-fed induction generation
  • the power conversion system 22 (PCS: Power Conversion System) includes a DC / DC or AC / DC bi-directional converter depending on the installation location to randomly charge and discharge power to the energy storage device (20).
  • This bi-directional power conversion system is an energy storage device to perform a low voltage acceptance operation (LVRT) function when the power generation of the wind turbine (small) is stopped due to the low voltage state below the predetermined level.
  • a command for supplying power to the system 30 from 20 is received, and control is performed to properly supply power from the energy storage device 20 to the system.
  • the power conversion system 22 (PCS: Power Conversion System) is authorized to supply power stored in the energy storage device 20 to the system at a first point when the voltage of the system drops below a predetermined size.
  • the power supply is prepared until the second time point at which the system voltage starts to rise, and the power from the energy storage device 20 until the third time point at which the system voltage starts to rise and is restored to a normal state.
  • the energy storage device 20 (ESS: Energy Storage System) including the power conversion system 22 (PCS: Power Conversion System) is provided as a separate individual device as shown in Figure 2, excluding the power converter, It may be installed between the wind generator 10 and the system 30.
  • ESS Energy Storage System
  • PCS Power Conversion System
  • the energy storage device 20 having the power conversion device 22 when the energy storage device 20 having the power conversion device 22 is combined in the existing power converter, since the retrofitting work and the cost thereof are very expensive, the power conversion device 22 without the retrofitting work is required. It is preferable to directly connect the energy storage device 20 between the power converter 16 and the system 30.
  • the energy storage system 20 (ESS: Energy Storage System) including the power conversion system 22 (PCS: Power Conversion System) is a power converter 16 included in the wind generator 10, as shown in FIG. Can be installed inside of.
  • ESS Energy Storage System
  • PCS Power Conversion System
  • the energy storage device 20 having the power converter 22 when the energy storage device 20 having the power converter 22 is installed in a new wind turbine, the energy storage device 20 having the power converter 22 is directly combined with the power converter 16. It is installed together with the power converter, the power conversion device 22 output terminal is the AC / DC converter 24 of the power converter 16 in the state that the energy storage device 20 is connected to the input terminal of the power converter 22 Connected between the DC / AC inverters 26.
  • the power converter 16 without a separate power converter is included. Only the energy storage device 20 may be connected between the AC / DC converter 24 and the DC / AC inverter 26 of the power source, and only the energy storage device may implement a system low voltage acceptance operation of the wind power generator according to the present invention. .
  • the energy storage device 20 should always store more than a certain level of energy in order to respond to the low-voltage acceptance operation (LVRT) requirements of the system at any time, and additionally the quality of wind power generation through the charge and discharge control of wind energy It is desirable to calculate the overall dose, taking into account the improvement target levels.
  • LVRT low-voltage acceptance operation
  • the energy storage device 20 itself includes a battery management system (BMS: Battery Management System) which is a kind of control means for safety management, temperature management, state of charge (SOC) management, communication functions, etc. Connected.
  • BMS Battery Management System
  • SOC state of charge
  • the energy storage device 20 is adopted to have a high discharge capacity to supply power to the system side through the discharge within a quick time, lithium ion battery (Li-ion), lithium iron phosphate battery (LiFePO 4 ), Lithium Manganese Oxide Battery (LiMn 2 O 4 ), Lithium Cobalt Oxide Battery (Lithum Cobalt Oxide), Lithium Polymer Battery (Li-ion Polymer), Lithium Air Battery, Ni-MH Battery, Nickel One or more of cadmium batteries (Ni-Cd), NaS batteries and supercapacitors can be used.
  • lithium ion battery Li-ion
  • LiFePO 4 lithium iron phosphate battery
  • LiMn 2 O 4 Lithium Manganese Oxide Battery
  • LiMn 2 O 4 Lithium Cobalt Oxide Battery
  • Lithium Polymer Battery Lithium Air Battery
  • Ni-MH Battery Nickel One or more of cadmium batteries (Ni-Cd), NaS batteries and supercapacitors
  • a low voltage acceptance operation method based on the above-described system low voltage acceptance operation apparatus of the present invention that is, a low voltage acceptance operation method performed by applying a command to supply power from the energy storage device to the system to the power conversion apparatus will be described below. Same as
  • FIG. 6 is a flowchart illustrating a method according to a preferred embodiment of the present invention for applying a command to supply power to a system from an energy storage device, and FIG. 5 to supply power to the system from an energy storage device.
  • LVRT reference diagram for explaining how to apply a command to the power converter and reference diagram showing the amount of energy discharge.
  • the power converter PCS
  • PCS power converter
  • a step (S101) of continuously monitoring whether the voltage of the system falls below a predetermined size to determine whether a low voltage situation occurs in the system is performed.
  • a time point at which the voltage of the system falls below a predetermined magnitude will be referred to as a first time point.
  • the wind power generation is stopped according to the wind generator stop algorithm (S102), and at the same time, the discharge of the energy storage device 20 is applied (S103).
  • the power converter 22 is discharged and starts to prepare for supply of power from the energy storage device 20 to the grid 30.
  • the time when the voltage of the system 30 falls below a predetermined magnitude, that is, the first time point corresponds to t0. It can be seen that, at this t0, the voltage of the system has dropped to Va. Accordingly, the power converter 22 can supply power from the energy storage device 20 to the system 30 while monitoring the voltage state of the system 30. Get ready.
  • a preparation process for supplying power from the energy storage device 20 to the system 30 As shown in FIG. 5, power supply preparation from the energy storage device to the system must be completed until t1, which is a point in time when the voltage of the system rises (hereinafter, referred to as a second time point).
  • the grid voltage sampling is periodically repeated for a predetermined time.
  • a slope for recovering the grid voltage is obtained and is proportional to the slope.
  • the discharge amount is increased, and the time to reach the third time point t2 can be predicted to be used for preparing the wind power generator (small).
  • the discharge of the energy storage device 20 is continued to monitor whether the voltage of the system 30 returns to the normal state (S106), and when it is determined that the voltage of the system 30 returns to the normal state, the wind power generator 10 ) Is restarted (S107).
  • the wind power generator 10 is restarted, and the energy storage device until the output according to the wind power generation reaches a normal level, that is, to the point (normally referred to as the fourth time point) at which power is normally supplied to the system ( Power supply to the system 30 is continued in 20) (S108).
  • the third time point t2 to the fourth time point t3 are the time taken for the wind power generator 10 to restart to produce power normally, wherein the third time point t2 to the fourth time point ( Since the energy storage device 20 discharges a lot of power in the section between t3), narrowing the range between the sections is effective to reduce the capacity of the energy storage device and also consumes invalidity when the wind turbine is restarted. Power can be supplied from the energy storage device.
  • ESS energy storage device 20 including the power converter 22 (PCS).
  • PCS power converter 22
  • the energy storage device 20 having a good instantaneous discharge capacity, it is possible to supply power to the system side through a large amount of discharge in a short time, the capacity of the energy storage device 20 Can be further reduced.
  • the low voltage accommodating operation apparatus of a wind power generator has an emphasis on solving the low voltage accommodating operation using an energy storage system (ESS) having an interlock structure.
  • ESS energy storage system
  • FIG. 8 which shows a low voltage accommodating and operating device of a wind turbine according to another embodiment of the present invention, an interlock switch (switch) having an interlock structure between the power converter 16 and the grid 30 of the wind turbine 10.
  • the dual energy storage device is connected by.
  • the main switch A1 is installed between the power converter 16 and the grid 30 of the wind power generator 10, and the first energy storage device ESS-1 between the power converter 16 and the main switch A1.
  • the second energy storage device (ESS-2) is connected by the second switch (B2) between the main switch (A1) and the system (30).
  • the main switch A1, the first switch B1, and the second switch B2 are arranged in an interlock structure with each other.
  • FIGS. 9 and 10 attached to a low voltage acceptance operation method of a wind power generator according to another embodiment of the present invention.
  • FIG. 9 illustrates the operation of the first switch B1 and the second switch B2 according to the opening of the main switch, and the charge / discharge characteristics of the first and second energy storage devices ESS-1 and ESS-2 with respect to the time axis.
  • 10 is a flowchart illustrating a low voltage accommodation driving method according to another embodiment of the present invention.
  • a step (S201) of continuously monitoring whether the voltage of the system falls below a predetermined size is performed.
  • the second energy storage device ESS-2 connected to the grid terminal by the second switch B2 has discharge characteristics, so that the main switch A1 is discharged.
  • the second energy storage device (ESS-2) becomes a virtual wind power generator to supply power to the grid during the low voltage receiving operation period in order to appear that there is no deviation of the wind turbine on the grid due to the opening.
  • the first energy storage device ESS-1 in the ON state of the first switch B1 is turned on.
  • the main switch (A1) is turned on to properly connect the wind generator 10 and the grid (30) (ON).
  • the first switch B1 is kept on and the second switch B2 is sequentially opened to continuously charge and discharge the first and second energy storage devices ESS-1 and ESS-2. Will be made.
  • the first energy storage device ESS-1 enters a discharge standby state (S206). The discharge is continued from the energy storage device ESS-2 to the system 30 (S207).
  • the first energy storage device ESS-1 is turned on in the state where the first switch B1 is turned on. Discharge is supplied to the generator 10 by the reactive power required for restart (S209), and at the same time the discharge of the second energy supply device (ESS-2) is continued (S210) and the voltage of the system 30 is stabilized
  • the main switch A1 is turned on (ON) in order to normally connect the wind power generator 10 and the system 30 (S212).
  • the voltage of the system 30 is maintained in a stable state, and after a predetermined time elapses, the main switch A1 is turned on (ON) and the second switch B2 is opened (off), thereby providing the wind generator 10.
  • the first energy storage device ESS-1 which continuously charges, serves as a buffer. After a predetermined time, only the wind turbine 10 is connected to the system 30 to supply power.
  • the wind turbine 10 and the grid 30 are instantaneously linked, so that the power of the grid 30 is transferred to the wind turbine 10.
  • the reverse algae flowing to the bar is generated, and the reverse algae is buffered in the first energy storage device ESS-1.
  • the main switch A1 is kept on in the state in which the wind power generator 10 and the system 30 are connected to each other.
  • the first switch B1 By turning on the first switch B1 to supply a certain level of reactive power from the first energy storage device ESS-1 to the wind turbine, it is possible to improve the power generation efficiency of the wind turbine 10.
  • the low voltage acceptance operation (LVRT) function required for the wind generator (small) in the system can be sufficiently satisfied, and After the low voltage acceptance operation (LVRT) is completed, the energy storage devices can be used for improving the power quality.

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Abstract

La présente invention se rapporte à un dispositif et à un procédé pour l'alimentation continue à basse tension des systèmes d'un générateur d'énergie éolienne. L'alimentation continue à basse tension d'un générateur d'énergie éolienne peut être facilement réalisée à l'aide d'un système de conversion d'énergie bidirectionnelle et d'un système d'emmagasinage d'énergie, et l'amélioration de la qualité de la production d'énergie éolienne peut être favorisée. C'est-à-dire, la présente invention consiste à produire un dispositif d'alimentation continue à basse tension économique et efficace résolvant l'alimentation continue à basse tension de systèmes par l'utilisation de la capacité de décharge du système d'emmagasinage d'énergie par rapport à un nouveau générateur (usine) d'énergie éolienne et au générateur (usine) d'énergie éolienne existant. Un système d'emmagasinage d'énergie comprenant un système de conversion d'énergie bidirectionnelle destiné à charger ou à décharger l'électricité générée depuis un générateur d'énergie éolienne relié au système est produit et actionné de manière à répondre à la fonction alimentation continue à basse tension (LVRT) nécessaire pour le générateur (usine) d'énergie éolienne lorsqu'une tension basse située sous un niveau prédéfini est générée dans le système et à maximiser la qualité d'électricité produite à partir de la production d'énergie éolienne.
PCT/KR2012/007825 2012-09-27 2012-09-27 Dispositif et procédé pour l'alimentation continue à basse tension de générateur d'énergie éolienne WO2014051175A1 (fr)

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CN103944185A (zh) * 2014-04-22 2014-07-23 上海电机学院 双馈异步电机低电压穿越控制系统及方法
KR101735308B1 (ko) * 2015-03-06 2017-05-15 군산대학교 산학협력단 플라이휠 에너지 저장장치를 이용한 풍력 터빈의 전력 충방전 제어 시스템 및 방법
WO2018200511A1 (fr) * 2017-04-24 2018-11-01 General Electric Company Système de stockage d'énergie pour générateur d'induction à double alimentation
CN113669199A (zh) * 2021-09-06 2021-11-19 中国华能集团清洁能源技术研究院有限公司 海上漂浮式单风轮风力发电机组的控制方法、系统及装置
CN114094624A (zh) * 2021-11-17 2022-02-25 天津大学 一种波浪发电系统低电压穿越协调控制方法
WO2023005582A1 (fr) * 2021-07-30 2023-02-02 西安热工研究院有限公司 Système de commande coordonnée de passage en basse tension et de passage en haute tension pour le stockage d'énergie hybride électrique-thermique

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CN103944185A (zh) * 2014-04-22 2014-07-23 上海电机学院 双馈异步电机低电压穿越控制系统及方法
KR101735308B1 (ko) * 2015-03-06 2017-05-15 군산대학교 산학협력단 플라이휠 에너지 저장장치를 이용한 풍력 터빈의 전력 충방전 제어 시스템 및 방법
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CN113669199A (zh) * 2021-09-06 2021-11-19 中国华能集团清洁能源技术研究院有限公司 海上漂浮式单风轮风力发电机组的控制方法、系统及装置
CN114094624A (zh) * 2021-11-17 2022-02-25 天津大学 一种波浪发电系统低电压穿越协调控制方法
CN114094624B (zh) * 2021-11-17 2023-01-17 天津大学 一种波浪发电系统低电压穿越协调控制方法

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