Method for variable-speed wind turbine generator to participate in frequency modulation of power system
A variable-speed wind turbine and power system technology, applied in the direction of reducing/preventing power oscillation, etc., can solve problems such as not being able to fully utilize the frequency modulation capability of wind turbines
Active Publication Date: 2019-08-30
STATE GRID GASU ELECTRIC POWER RES INST +2
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Problems solved by technology
The scheme of using wind turbines to participate in the frequency regulation of the power system is a hot topic in theoretical research, but the existing technology cannot fully utilize the frequency regulation capability of the wind turbine itself
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[0017] Although the variable speed wind turbines widely used at present adopt AC frequency conversion control, the decoupling control makes the active power of the unit unable to respond to the system frequency change. Such wind turbines usually operate under the maximum power point tracking (MPPT) control mode, so that the kinetic energy of the rotor is buried and no active power backup is provided, and inertial support cannot be provided when there is an external disturbance. In order to prevent sudden changes in the system frequency, it is generally necessary to allow the generator to have enough time to adjust the generated power to rebuild the power balance through the inertia response. Because the variable speed wind turbine has flexible and controllable active power regulation capability. Therefore, the fast active power adjustment function of the unit can be used to store or release the kinetic energy of the rotor and virtualize the inertia response.
[0018] When the...
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The invention provides a method for a variable-speed wind turbine generator to participate in frequency modulation of a power system. The method comprises the following steps: (1) initializing a powermargin, a pitch angle, an active instruction, a rotating speed and the like; (2) judging whether the rotating speed is greater than a rated rotating speed; (3) if the rotating speed is greater than or equal to the rated rotating speed, determining the electromagnetic torque, and if the rotating speed is less than the rated rotating speed, performing overspeed control by using the FIG. 1 deloadingcurve until the rotating speed is greater than or equal to the rated rotating speed; (4) determining the electromagnetic torque, and determining the pitch angle corresponding to the optimal electromagnetic torque by applying the relation curve of the pitch angle and the torque; and (5) judging whether the system frequency is normal, if yes, returning to the step (2) and if not, releasing the rotor kinetic energy to respond to the system frequency change.
Description
technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a method for variable-speed wind turbines to participate in power system frequency regulation. Background technique [0002] As an important renewable energy source, wind energy plays an important role in future energy development. As the penetration rate of wind power continues to increase, the problem of frequency stability in power systems will also increase. Although the variable speed wind turbines widely used at present adopt AC frequency conversion control, the decoupling control makes the active power of the unit unable to respond to the system frequency change. This kind of wind turbine usually operates under the maximum power point tracking (MPPT) control mode, so that the kinetic energy of the rotor is buried and no active power backup is provided, and inertial support cannot be provided when there is an external disturbance. In order to prev...
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IPC IPC(8): H02J3/24
CPCH02J3/24Y02E10/72
Inventor 丁坤周识远何世恩汪宁渤李津张珍珍陈钊马明高鹏飞康坚周强张睿骁王定美吕清泉张金平黄蓉王明松张健美张柏林邵冲李晓虎韩自奋张艳丽
Owner STATE GRID GASU ELECTRIC POWER RES INST