Abstract
The paper proposes an original metod to control the wind power system at variable wind speed. In the case of those high power wind systems that presents large inertia moments due to the variable wind speed, the rotation speed of both wind turbine and permanent magnet synchronous generator can not be modified in a timely manner so as to ensure the turbine operating in maximum power points. Therefore, the paper presents two control structures. First structure is based on the load calculation of permanent magnet synchronous generator and the second is based on the load modifying by using controllers. The rotation speed of turbine estimation has been used as reference in the both structures.
Highlights
The wind speed ranges as in (1), and the best results are achieved, into the technical- economical working domain, for the interval 12 ÷ 15 m/s.V 4 25 m / s (1)The wind power systems are controled by considering the average wind speed [8,9,10,11,12,13,14,15,16,17]
In the case of wind power systems operation due to time variation of wind speed, a lot of important issues occure, they are the following: 1. load generator determination is perform in order to accomplish the maximum of captured energy for a long time period; 2. most efficient control methods determination from the both technical and economical points of view; 3. some real mathematical models determination for wind turbine and electrical generator; 4. boundaries establishing between to fit the initial conditions, in the case of electrical network plugging, is achieved by simulation; 5. establishing the quality of base duty cycles for different control structures shall be determined by simulation
Requiring the generator load resistance that is calculated by using the mathematical models of both wind turbine, permanent magnet sincronus generator and by measuring the wind speed, as well;
Summary
The wind speed ranges as in (1), and the best results are achieved, into the technical- economical working domain, for the interval 12 ÷ 15 m/s. In the most works [1,21] the control methods at full power are proposed, which may result in a shutdown of the turbine because the artificially increased power is not obtained from the wind, but from the kinetic energies variation of rotating masses Considering this reason, it is more fair to operate at maximum energy obtained in a large time interval, by the order of days. The RPM reference value can be achieved by various methods: requiring the generator load resistance that is calculated by using the mathematical models of both wind turbine, permanent magnet sincronus generator and by measuring the wind speed, as well; using controllers that modify the generator load in order to obtain the reference speed. RPM modification of the generator is slowly due to the very high inertia momentums of wind turbine and it can not follow a fast variation of the wind speed, as required to operate in the maximum power points [1], [3], [15]
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