WO2011161692A2 - Gestion de puissance réactive pour applications d'éolienne - Google Patents

Gestion de puissance réactive pour applications d'éolienne Download PDF

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Publication number
WO2011161692A2
WO2011161692A2 PCT/IN2011/000405 IN2011000405W WO2011161692A2 WO 2011161692 A2 WO2011161692 A2 WO 2011161692A2 IN 2011000405 W IN2011000405 W IN 2011000405W WO 2011161692 A2 WO2011161692 A2 WO 2011161692A2
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WO
WIPO (PCT)
Prior art keywords
power
grid
inverter
wind turbine
turbine
Prior art date
Application number
PCT/IN2011/000405
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English (en)
Other versions
WO2011161692A3 (fr
Inventor
V. R. Raghunathan
Original Assignee
Raghunathan V R
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Raghunathan V R filed Critical Raghunathan V R
Publication of WO2011161692A2 publication Critical patent/WO2011161692A2/fr
Publication of WO2011161692A3 publication Critical patent/WO2011161692A3/fr

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Classifications

    • 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
    • F03D9/257—Wind motors characterised by the driven apparatus the apparatus being an electrical generator connected to electrical distribution networks; Arrangements therefor the wind motor being part of a wind farm
    • 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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1892—Arrangements for adjusting, eliminating or compensating reactive power in networks the arrangements being an integral part of the load, e.g. a motor, or of its control circuit
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • 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
    • 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
    • H02J3/40—Synchronising a generator for connection to a network or to another generator
    • 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
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

Definitions

  • This invention relates to electrical power generation and in particular to reactive power management in an asynchronous generator wind turbine without the usage of capacitor banks for the power factor and excitation maintenance.
  • a Wind Turbine (WT) consists of the necessary systems needed to capture the wind's energy, point the turbine into the wind, convert mechanical rotation into electrical power, and other systems to start, stop, and control the turbine.
  • the main energy conversion part in wind turbine is the generator. Few types of generators are named below:
  • ⁇ DC Generators used for low power applications.
  • the type of turbine and the type of generator are primarily important for the wind turbine which provides the efficient energy conversion part of the system.
  • synchronous generator type is generally used but with the advancement and inventions in power electronics and efficient control system, the asynchronous alternator are getting familiar which has advantages over synchronous and DC generators.
  • the major Advantages in asynchronous alternators in wind turbine are:
  • the IG wind turbine with Self Excitation which is a stand alone type (remote place operative) and not necessary to connect to the power grid (G).
  • capacitor banks is connected across the supply line to improve the power factor. Different capacitor banks are switched for different load levels.
  • the excitation is made using the capacitor banks which deliver required leading current to overcome the magnetizing current to induce Self excitation.
  • the SEIG have a serious voltage regulation problem when load and/or speed changes. The remedy to this problem is associated with the need of a continuous supply of the necessary leading reactive power.
  • a compensating leading current to be provided This is done by connecting a Capacitor across the supply lines. Different value capacitor banks are to be connected for different load levels to keep the power generation in control and without loosing the excitation.
  • US 2758272 show a different and more primitive method of implementing power factor correction.
  • the induction generator is operated in parallel with the primary winding of a saturable transformer across the secondary winding of which Is connected a fixed reactive load.
  • the saturation of the magnetic core may be controlled for which in turn controls modifies tho mutual inductance, and hence in turn the value of the secondary reactance seen reflected at the primary terminals.
  • patent document WO 2004/040748 describes a circuit arrangements for use in a variable speed wind turbine system comprising a double-fed induction generator (IG) and a back-to- back converter.
  • the circuit arrangement in a grid-connected variable speed wind turbine system comprising a double-fed induction generator connected on the stator side to the grid (G) and on the rotor side to a back-to-back converter connected for transferring energy between the rotor of the double-fed induction generator and the grid (G), is provided with means for disconnecting at least one normally grid-connected terminal of the back-to-back converter from the grid (G) and means for connecting an impedance for allowing controlled power transfer from the intermediate DC circuit to said impedance.
  • the control is performed by one or more power-switching elements of the normally grid- connected converter, which has been disconnected from the grid (G). This makes it possible to keep the generator connected to the grid (G) during grid (G) faults and take active part in the reestablishment of the grid (G) voltage.
  • the other document US 5225712 discloses a variable speed wind turbine with reduced power fluctuation and a static VAR mode of operation with reactive power control.
  • the wind turbine power converter herein that smoothes the output power from a variable speed wind turbine, to reduce or eliminate substantial power fluctuations on the output line is disclosed.
  • the power converter has an AC- to-DC converter connected to a variable speed generator that converts wind energy to electric energy, a DC-to-AC inverter connected to a utility grid (G), and DC voltage link connected to an electrical energy storage device such as a battery (B) or a fuel cell, or a photovoltaic or solar cell. Also, an apparatus and method is disclosed herein for controlling the instantaneous current flowing through the active switches at the line side inverter to supply reactive power to the utility grid (G).
  • the inverter can control reactive power output as a power factor angle, or directly as a number of VARs independent of the real power.
  • Reactive power can be controlled in an operating mode when the wind turbine is generating power or in a static VAR mode when the wind turbine is not operating to produce real power.
  • a voltage waveform is used as a reference to form a current control waveform for each output phase.
  • the current control waveform for each phase is applied to a current regulator which regulates the drive circuit that controls the currents for each phase of the inverter.
  • Means for controlling the charge/discharge ratio and the regulating the voltage on the DC voltage link is also disclosed.
  • patent document US 6924565 discloses a continuous reactive power support for wind turbine generators with real and reactive power control for wind turbine generator systems.
  • the technique described herein provides the potential to utilize the total capacity of a wind turbine generator system (e.g., a wind farm) to provide dynamic VAR (reactive power support).
  • the VAR support provided by individual wind turbine generators in a system can be dynamically varied to suit application parameters.
  • WO 2009/083446 discloses an apparatus and method for controlling reactive power from clusters of wind turbines connected to a utility grid (G).
  • the reactive power is generated or absorbed by at least two groups of wind turbines configured with doubly fed induction generators.
  • Each of these groups of wind turbines are herein termed a cluster.
  • One cluster comprises wind turbines that both generate reactive power (+Q) by operating in an overexcited mode and, if desired, also absorb reactive power in an under excited mode while the second group is adapted to only absorb reactive power (-Q).
  • IG self excitation induction generator
  • a system for providing the pre determined reactive power to the asynchronous generator through a feed back controlled inverter by eliminating the usage of physical capacitor banks comprises
  • a Digital control system for comparing the DC voltage, controlling the inverter, recharging the battery (B), providing unity power factor, efficient power transfer to the grid (G) and for monitoring the availability of grid (G) power, wind speed and loads to be powered.
  • a method for providing the pre determined reactive power to the asynchronous generator through a feed back controlled inverter by eliminating the usage of physical capacitor banks during stand alone mode of turbine operation comprises the steps of
  • the present invention concerns with a system for generating the required reactive power from a separate built in power source to maintain self excitation and to sustain the operation without usage of any physical capacitor banks switching with the generator lines within the predefined operation conditions (changes in wind speed, load).
  • the system generates the required reactive power from a separate built in power source to maintain the power factor to the optimum level for higher efficiency without any separate capacitor banks switching in the generator power line.
  • a control system which monitors whose input signals are generator's rotor speed, load, excitation voltage and provide necessary relative power to the SEIG is taken from a DC source through controlled IGBT drivers.
  • the pulse width modulation (PWM) of the IGBT is controlled by varying the modulation index by the control system, and the feed back for the reactive power required based on the charge accumulated on the DC side of the IGBT inverter.
  • the proposed design system monitors the wind speed, local load requirement, grid (G) availability and accordingly manages the power distribution for optimum usage of the power produced by the wind turbine,
  • This system is used to work as a standalone wind turbine without grid power to provide electrical power for devices like pump (P), heaters, etc or with the grid (G) power connected where the generated power is exported fully/partially after usage of the local loads like pump (P), heater, etc. or with grid (G) power connected, when there is no sufficient wind energy is available to supply power from grid (G) to the local loads like pump (P), heater, etc.
  • Fig.2 illustrates the functional block diagram of the system during the operation condition at scenario serial numbered 4.
  • Fig. 3 illustrates the flow of steps involved in the system during the operation condition at scenario serial numbered 4.
  • Fig. 4 illustrates the functional block diagram of the system during the operation condition at scenario serial numbered 8.
  • Fig. 5 illustrates the flow of steps involved in the system during the operation condition at scenario serial numbered 8.
  • Fig. 6 illustrates the functional block diagram of the system during the operation condition at scenario serial numbered 6.
  • Fig. 7 illustrates the functional block diagram of the system during the operation condition at scenario serial numbered 7.
  • Fig. 8 illustrates the flow of steps involved in the system during the operation condition at scenario serial numbered 6 and 7.
  • a Wind turbine control system may have its operation in two modes of configuration. They are as a stand alone type which generates electrical energy and supply to load from wind energy at remote places where no grid power is available, the system controlling an asynchronous machine as a Self excitation Induction generator (SEIG) by maintaining necessary slip with closed loop feedback from DC side of the inverter control.
  • SEIG Self excitation Induction generator
  • the system is capable of being connected to grid (G) power if available and supplies the generated power to local loads or to the Grid (G) line or to supply to local loads and also the excess to grid (G) line.
  • the system controlling a power grid (G) connected asynchronous generator (IG - induction generator (IG)) and maintaining the power factor near unity by adequate control of the inverter in synchronous with the grid (G) supply voltage.
  • IG synchronous generator
  • the normally used capacitor banks are eliminated here (no physical capacitors banks being switched)
  • the required reactive power is supplied to the asynchronous generator / leading current to the loads through an feedback controlled inverter from an energy source in proportion to the requirement based on the power factor, turbine rpm, load variation, etc.
  • the above operation hold good for stand-alone wind turbine without grid connection or with grid (G) connection used in farms to pump (P) water from well, to power heater and to various applications etc.
  • G grid
  • the system line diagram and the functional block diagram of the system during the scenario of si. No. 4 are illustrated in fig.2.
  • the systems comprises of Digital control system (DCS) having micro controller units, Inverter section with transistor drivers, DC charge and pump (P) control having battery (B) to store and provide the required DC power.
  • DCS Digital control system
  • P DC charge and pump
  • DCS Digital control system
  • the Digital control system (DCS) which is the core control system has
  • CC Configuration selector and driver control interface
  • GF.PFB.RF Feed back signal
  • Pulse Width Modulated -Voltage Source Inverter (PWM-VSI) control This section is primarily used when the turbine is operated in stand alone mode. The function of this section is that the DC voltage from the inverter DC side section is compared with the internal reference and the inverter frequency is controlled in such a way that a negative slip is maintained for sustained SEIG operation without the requirement of any physical capacitor bank switching. Line svnc UPF Control
  • This section is primarily used when the turbine is connected to the grid (G).
  • the prime function of this section is to control the inverter in parallel with the power grid (G) line, to pump (P) required excess current and withdraw the available excess current from grid (G)/load in synchronization with the power grid (G) voltage level.
  • the required instantaneous additional power is taken from the battery (B) source by the inverter and the excess power available is subsequently used to charge back and the battery (B) acts as a load to consume the additional power available.
  • the current waveform is made in sync with the voltage and thus obtaining the near unity power factor. This achievement of unity power factor ensures the efficient power transfer to grid (G) and usage by the loads.
  • the objective of this section is to monitor the availability of grid (G) power, wind speed and loads to be powered. According to the prevailing inputs the mode of operation is selected and to control the turbine operation to the maximum efficiency possible.
  • G grid
  • the digital, analog and reference feedback voltage are scaled to the proper level for the controller interface.
  • the Insulated Gate Bipolar Transistor (IGBT) is used as the switching components in the inverter.
  • the inverter is driven by the configuration/ Driver control section.
  • the signals are opto-isolated and fed to the IGBT through the driver IC's.
  • the inverter is capable of handling the power requirement s of the IG and the Load current.
  • the Battery (B) is the DC source which is used for
  • the charger is used to charge the batteries from the supply available at the DC side of the inverter during the standalone mode and from the excess power available during the current control in sync with the power line voltage when Grid (G) power is available.
  • Fig. 3 illustrates the flow of steps involved in the system during the operation condition at scenario serial numbered 4 of fig.1.
  • the turbine is stand alone mode (no grid connected or grid (G) connected but no grid power available) when sufficient wind speed is available, the CN-A contact is engaged, the IG is started in the motoring mode to run wind turbine by switching the inverter controls and the necessary power for startup is taken from the DC source say Battery (B).
  • the inverter control signals are controlled such that the stator frequency cos is maintained lower sufficiently so that the IG is self excited and runs in the power generation mode.
  • the PWM Control (1) takes care of this functioning to ensure sustained power generation.
  • a method for providing the pre determined reactive power to the asynchronous generator through a feed back controlled inverter by eliminating the usage of physical capacitor banks during stand alone mode of turbine operation comprises the following steps of operating the turbine in stand alone mode with no grid connected or no grid power if connected, checking for the sufficient wind speed availability for the wind turbine, upon achieving sufficient wind speed, engaging the CN-A contact, starting the IG in the monitoring mode, running the wind turbine by switching the inverter controls, obtaining the power for start up from the battery (B), sensing the speed of the wind turbine from the rotor RPM by the Digital control system (DCS), checking for the sufficient speed availability in the wind turbine, upon achieving sufficient speed, controlling the inverter control signals for stator frequency cos sufficiently lower, self exciting the IG and running it in power generation mode, maintaining the sustained power generation by the PWM-VSI Control (1) and engaging the CN-P contact and using the generated power to the local load.
  • DCS Digital control system
  • Fig. 4 and 5 illustrates the functional block diagram of the system during the operation condition at scenario serial numbered 8 of fig.1 and the flow of steps involved in the system during the operation condition at scenario serial numbered 8 of fig.1.
  • the turbine is in the grid (G) connected type (also grid (G) power is available) and when sufficient wind speed is available, the CN-A contact is engaged, the IG is started in the motoring mode to run T by switching the inverter controls and the necessary power for startup is taken from the DC source say battery (B).
  • the grid (G) power is connected by engaging the CN-G contact.
  • the IG rotor speed cor tends to increase which makes a negative slip and the power is generated, the generated power is supplied to the local load say pump (P) by engaging CN-P or Grid (G) through CN-G or by both.
  • the Power factor is maintained near unity.
  • the Inverter is connected in parallel and controlled by the Line sync UPF control by pumping required current in sync to the Grid (G) voltage and draws and charges to battery (B) the excess current in sync with the grid (G) voltage.
  • a method for providing the pre determined reactive power to the asynchronous generator through a feed back controlled inverter by eliminating the usage of physical capacitor banks during stand alone mode of turbine operation comprises the steps of operating the turbine in the grid (G) connected mode with available grid (G) power, checking for the sufficient wind speed availability for the wind turbine, upon achieving sufficient speed, engaging the CN-A contact, starting the IG in the motoring mode, running the wind turbine by switching the inverter controls, obtaining the necessary power for start up from the DC source of battery (B), sensing the speed of the wind turbine from the rotor RPM by the DCS, checking for the sufficient speed availability in the wind turbine, upon achieving sufficient speed, engaging the CN-G contact and connecting to the grid (G) power, increasing the IG rotor speed cor, initiating a negative slip and generating the power, engaging the CN-P or CN-G or both for utilizing the generated power by the local loads, connecting the inverter in parallel for maintaining the power factor to unity and for generating efficient power, pumping the required power in
  • Figs. 6, 7 and 8 illustrate the functional block diagram of the system during the operating condition at scenario serial numbered 6 and 7 and the flow of steps involved in the system during the operating condition at scenario serial numbered 6 and 7.
  • the system can be used in consumer mode, i.e. the required power to the local load say pump (P) is drawn from the Grid (G).
  • the Power factor is maintained near unity.
  • the Inverter is connected in parallel and controlled by the Line sync UPF control by pumping required current in sync to the Grid (G) voltage and draws and charges to battery (B) the excess current in sync with the grid (G) voltage.
  • a method for providing the pre determined reactive power to the asynchronous generator through a feed back controlled inverter by eliminating the usage of physical capacitor banks during stand alone mode of turbine operation comprises the steps of operating the wind turbine in grid (G) connected mode with available grid (G) power, using the system in the consumer mode of operation during the non availability of wind power and drawing the required power for the local load from the grid (G), connecting the inverter in parallel for maintaining power factor to unity and for having effective power consumption, pumping the required current in sync to grid (G) voltage by the line sync UPF control, drawing and charging the battery (B) with the excess current in sync to the Grid (G) voltage.
  • the system supplies required reactive power to IG for self excitation without physical capacitor bank switching and works as a stand alone unit.
  • the system provides the required reactive power by maintaining necessary slip by driving the stator with necessary frequency for the variance of turbine rpm (rotor speed), load changes.
  • the system generates power with optimum efficiency by monitoring the power factor and maintains the PF near unity by providing necessary reactive power to the SEIG.
  • the necessary reactive power for the above said conditions is converted from a separate DC power source say battery (B) and the necessary reactive power produced using a PWM controlled inverter configuration using IGBT's as switching elements, whereas the input is taken from a DC source.
  • the DC power source is a rechargeable power source, where the excess backward voltage is used to recharge the DC source.
  • the amount of reactive power to be provided to the SEIG is controlled with the reference based on the amount of the backward return voltage charge level.
  • the DC power source is also necessarily charged back using a portion of the power generated.
  • the generated power is used to drive pump (P) motors, heaters and other electrical appliances. With this turbine also connected to power grid (G), and whenever power grid (G) is present, and on necessity will directly link with power grid (G) and work as IG and uses the reactive power from grid (G) for primary functioning.
  • the power generation will be done when sufficient wind energy is available and the control systems recognize this mode and controls the IG based on the load, power factor and slip.
  • the control system switches the inverter control in synchronization with the power grid (G) frequency, phase sequence.
  • the leading reactive power is injected by the inverters driven by the control system based on the inputs which are taped from the power grid (G) delivery lines and Induction generator (IG).
  • This turbine generates power as a stand alone type with SEIG as mentioned above in remote places where there is no power grid (G) is available.
  • This turbine also generates power as a stand alone and also can be connected to the power grid (G) where there is power grid (G) available to export generated power to grid (G) or export excess power to grid (G) after delivering to the local loads.
  • This turbine generates power with grid (G) connected and works as stand alone mode for delivering power to the local loads whenever there is a power failure in the power grid (G) and also may be connected to the power grid (G).
  • This turbine takes power from the power grid (G) and delivers to the local loads whenever there is not sufficient wind energy is available to harvest.
  • This system is used to work as a standalone wind turbine without grid power to provide electrical power for devices like pump (P), heaters, etc or with grid (G) power connected where the generated power is exported fully/partially after usage of the local loads like pump (P), heater, etc. or with grid (G) power connected, when there is no sufficient wind energy is available to supply power from grid (G) to the local loads like pump (P), heater, etc.

Abstract

La présente invention concerne une puissance réactive prédéterminée pour un générateur asynchrone d'une éolienne, par l'intermédiaire d'un onduleur asservi par élimination de l'utilisation de groupements de condensateurs et pouvant être installé dans des emplacements distants dans lesquels un réseau électrique (G) n'est pas disponible. Un nouveau système de commande doté d'un réglage d'onduleur triphasé utilisant des transistors de puissance ou des transistors bipolaires à grille isolée comme éléments de commutation fournit une puissance réactive pour que l'excitation maintienne une production permanente. Un glissement négatif est commandé en fonction de la tension continue de référence produite par les diodes libres des transistors bipolaires à grille isolée. Dans le système connecté à un réseau électrique (G), un meilleur rendement est obtenu par pompage de la puissance réactive provenant de l'onduleur triphasé en synchronisation avec la fréquence de ligne (G) du réseau électrique. Le système peut également être utilisé dans des éoliennes non connectées à un réseau électrique (G) pour fournir du courant électrique à des charges locales et dans des systèmes connectés à un réseau électrique (G), le courant produit par l'éolienne est exporté entièrement/partiellement après avoir été utilisé pour des charges locales.
PCT/IN2011/000405 2010-06-21 2011-06-16 Gestion de puissance réactive pour applications d'éolienne WO2011161692A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN1716/CHE/2010 2010-06-21
IN1716CH2010 2010-06-21

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WO2011161692A3 WO2011161692A3 (fr) 2012-06-21

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CN103840487A (zh) * 2014-04-01 2014-06-04 阳光电源股份有限公司 黑启动方法、能量管理系统和共交流母线离网型光储微网
CN104282132A (zh) * 2014-10-20 2015-01-14 国家电网公司 农灌机井无功就地补偿远程抄表装置及其系统
CN104578169A (zh) * 2015-02-06 2015-04-29 阳光电源股份有限公司 一种共交流母线离网型微网系统及其能量控制方法
US10742149B1 (en) 2019-04-22 2020-08-11 General Electric Company System and method for reactive power control of a wind turbine by varying switching frequency of rotor side converter
US10931115B1 (en) 2019-09-30 2021-02-23 General Electric Company Electrical power systems having a cluster transformer with multiple primary windings

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US5225712A (en) 1991-02-01 1993-07-06 U.S. Windpower, Inc. Variable speed wind turbine with reduced power fluctuation and a static VAR mode of operation
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