There has been at least one notorious system-wide outage in the region operated under the auspices of the Western Electric Coordinating Council WECC that was attributed to inadequate power oscillation damping. The present invention implements power oscillation damping in the controls of the wind turbine system-side also referred to as the line-side converter, using either voltage control only when the turbine is not producing real power or voltage control supplemented by active power control when the turbine is producing real power , using a supplemental stabilizing signal to control the regulated voltage as described below.
The line side converter can also regulate voltage, which can be used to damp the power oscillations. This control strategy of the invention should be sufficiently general to accommodate the various controls that are used to implement power oscillation damping e. These features further differentiate the present invention from the scheme described in the Ledesma and Gallardo paper. As noted above, the paper considers damping using only real power modulation, not using voltage regulation. The scheme of the present invention is superior, since real power modulation is available when wind turbines are producing real power, while voltage regulation is available whenever a wind turbine is on-line, irrespective of whether it is producing real power for the grid e.
Generating stations supply electricity to a transmission line also via intermediate transformers and associated equipment not shown in the figure. The transmission lines and are interconnected through a transmission tie line Wind turbines supply power to the transmission line and a wind turbine supplies power to the transmission line It is believed that a device with power oscillation damping capabilities can be enhanced if the device includes a source of real energy, allowing modulation of the power angle i.
Consequently, oscillation damping devices have been proposed with battery, super-capacitor and superconducting magnetic energy storage devices. Various control strategies have been developed to take advantage of this enhanced capability. According to one embodiment of the invention, each of the wind turbines and comprises a full converter wind turbine that appears, from the perspective of the power grid , to be either a control device that is not supplying real energy such as during a curtailment when the wind turbine is not producing real power but is available for regulating the voltage or a control device that supplies real energy such as when the wind turbine is producing power for the grid.
The full converter can regulate voltage independently of real power; voltage regulation requires no real energy other than to compensate for real losses. Consequently, in addition to supplying real power to the power grid , a suitably controlled wind turbine or can provide an ancillary function of power oscillation damping, with or without energy storage, as appropriate.
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Thus if the wind turbine can store energy, it can use the stored energy to damp power oscillations even when the turbine is not producing energy. Further, the wind turbine can use voltage control alone to damp oscillations when it is not producing energy for the grid. Thus a conductor extending from the generator receives magnetizing current from a generator side converter and supplies real power P at a variable frequency dependent on the rotational speed of the induction generator rotor to the generator side converter The generator side converter rectifies the variable frequency signal to DC.
The DC power is supplied to a line-side converter that outputs real power P at 60 Hz and regulates system voltage. If one of the wind turbines and of FIG. The power oscillations are damped by controlling one or more of the real output power P AC or the voltage output. It is noted that changing the voltage of the wind turbine changes the output power. A synchronous generator such as a permanent magnet synchronous generator can be substituted for the induction generator with the same inventive results.
The generator side converter can be simplified in this embodiment as it is not required to provide magnetizing current to the generator.
A stator of the DFIG connects directly to the grid The rotor converter also may also generate reactive power Q as illustrated, without providing real power. The rotor converter is typically about one-third the size of a generator-side or line-side converter used in other wind turbine systems. A control scheme for controlling the line side converter or rotor converter, as described above, is described with reference to FIG.
A reference parameter frequency, real power, integral of accelerating power, or any other quantity as known by those skilled in the art , a monitored controlled parameter and a supplemental control signal are input to a combiner A lead or lag term may be associated with the supplemental control signal as indicated. The resulting combined signal, referred to as a control signal, is used to control the converter.
For example, the control signal may control a voltage regulator to produce a desired voltage signal to damp the undesired oscillations. As is known to those skilled in the art, various power system parameters can be used to generate the control signal.
Power System Oscillations | Graham Rogers | Springer
While various embodiments of the present invention have been shown and described herein, it will be obvious that such embodiments are provided by way of example only. Numerous variations, changes and substitutions may be made without departing from the invention herein. Accordingly, it is intended that the invention be limited only by the spirit and scope of the appended claims. Effective date : A wind turbine 8 for controlling power oscillations on a grid of a power system The wind turbine 8 comprises rotor blades 12 for turning by the wind, an electric generator 20 rotatably coupled to the rotor blades 12 , a power converter 24 responsive to electricity generated by the electric generator 20 , the power converter 24 for converting the generated electricity to a frequency and voltage suitable for supply to the power grid 28 , and the power converter for regulating voltage on the grid supplemented by modulating real power for damping the power oscillations.
The invention claimed is: 1. A wind turbine for controlling power oscillations associated with groups of generators or generating plants interspersed on a grid of a power system, the power oscillations created following power system disturbances, the wind turbine comprising: rotor blades for turning by the wind;. The wind turbine of claim 1 further comprising a fixed speed wind turbine or a variable speed wind turbine.
The wind turbine of claim 1 wherein the electric generator comprises a doubly fed induction generator. The wind turbine of claim 3 wherein the doubly-fed induction generator comprises stator windings and rotor windings, the stator windings responsive to a current supplied to or from the grid and from which real power flows by action of the rotor windings turned by action of the rotor blades. The wind turbine of claim 1 wherein the power converter is responsive to a control signal indicative of the power oscillations on the grid.
The wind turbine of claim 5 wherein the control signal is generated responsive to one of frequency, electric power, accelerating power, and an integral of accelerating power. The wind turbine of claim 1 wherein the power converter comprises a line side power converter, the wind turbine further comprising a generator side power converter. The wind turbine of claim 1 wherein the electric generator comprises an induction generator or a synchronous generator.
The wind turbine of claim 1 , wherein the power oscillations comprise inter-area power oscillations. The wind turbine of claim 1 , wherein the power oscillations comprise a frequency in a range from 0. A method for controlling power oscillations associated with groups of generators or generating plants interspersed on a grid of a power system, the power oscillations created following power system disturbances, the method comprising: generating electricity by rotation of an electric generator rotatably coupled to rotor blades of a wind turbine, wherein wind energy causes rotation of the rotor blades;.
The method of claim 11 , wherein the power oscillations comprise inter-area power oscillations. Damping of power oscillations by using a wind turbine with full or partial reshaping. USB2 en. EPB1 en. CNB en. CAC en.
Power system oscillations
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Beck, G. Bongiorno, M. Brownlees, S. Dolan, D. El-Moursi, M. Fernandez, R. Fujita, H. Jauch, C. Jesus, F. Khaparde, S. Miri, A. Mohammadpour, H. Pal, B. Petersson, A. Qiao, W. Rawn, B. Snyder, A. Suul, J. Tang, G. Zhongda, L. WOA3 en. CAA1 en. Chen et al.
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Joos et al. The amount of energy is consistent with the oscillation amplitude, and then the component producing energy has negative contribution to the damping and is considered as the oscillation source.
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The consistency of energy dissipation with damping torque of a generator is proved. View on IEEE. Save to Library. Create Alert. Similar Papers. Figures, Tables, and Topics from this paper. Figures and Tables. Citations Publications citing this paper. Dissipating energy flow method for locating the source of sustained oscillations Slava Maslennikov , Bin Wang , Eugene Litvinov. Chevalier , Petr Vorobev , Konstantin Turitsyn.