Fuzzy logic integrated electrical control to improve variable speed wind turbine efficiency and performance

An efficient wind driven turbine driven electric power generator fuzzy logic based control system to improve power efficiency of the generator comprising:

• an induction operated generator including an air gap with magnetic flux;
• a pulse width modulated control operating to vary a speed of said generator to maintain a substantially constant power frequency output from said generator;
• fuzzy logic based controls to modify the operation of said pulse width modulated control to maximize a power output of said generator under variations of a wind driving said power generator;
• the modification of said operation of said pulse width modulated control to maximize said power output including means to vary said airgap magnetic flux of said generator;
• wherein said control system further includes at least one solid state converter to control the speed of said generator to maintain said substantially constant power frequency;
• said fuzzy logic control system further includes a fuzzy logic adaptive controller to adjust the speed of said variable speed generator for maximization of power output;
• said fuzzy logic control system includes at least one fuzzy logic controller which controls a flux component of current of said generator to further maximize the power output of said generator;
• said at least one solid converter includes a pulse width modulator and said fuzzy logic control system provides an input to said pulse width modulator;
• and
• wherein said fuzzy logic controller utilizes a fuzzy logic role base which is substantially:
• ______________________________________ .DELTA.P.sub.o .backslash.L.DELTA. N P ______________________________________ PB NB PB PM NM PM PS NS PS ZE ZE ZE NS PS NS NM PM NM NB PB NB ______________________________________
• wherein:
• P.sub.o =power output of generator
• L.sub..DELTA. =last change
• S=small
• B=big
• N=negative
• P=positive
• Z=zero.

An efficient integrated intelligent adaptive controller for a variable speed electric power generator including an air gap with magnetic flux driven by a variable power source comprising:

• said generator being a squirrel cage induction motor;
• power detection means to detect an electrical output power of said electrical power generator;
• means including fuzzy logic control means to maintain a required speed of said electrical power generator for substantially constant power frequency output substantially independent of wind turbulence effects;
• means to determine an optimum operation of said electrical power generator which will provide improved efficiency;
• and
• said fuzzy logic control means to vary said airgap magnetic flux of said electrical power generator in increments to modify said speed of said generator to further improve said efficiency;
• said fuzzy logic control including a plurality of intelligent fuzzy logic controllers operating in response to signals derived from the power output of said electric power generator;
• said fuzzy logic controllers providing a plurality of control signals;
• one of said control signals varying a rotor speed of said generator to optimize a turbine aerodynamic efficiency for maximum power output;
• and
• another of said control signals reducing a magnetizing component of a stator current of said generator to optimize said generator air gap magnetic flux to minimize power losses of said generator.

An efficient integrated intelligent controller for a variable speed generator including an air gap with magnetic flux driven by a variable power source comprising;

• power detection means to detect a electrical output of said electrical power generator;
• means to maintain a required speed of said electrical power generator substantially independent of wind turbulence effects;
• means including fuzzy logic control means to determine the optimum operation of said electrical power generator which will provide improved efficiency;
• and
• said fuzzy logic control means responsive to said power detection means to vary said airgap magnetic flux of said electrical power generator in increments to modify said speed of said generator to further improve said efficiency;
• wherein said variable power source is wind and wind turbine is provided to rotate said generator in response to said wind;
• said fuzzy logic control includes means to vary said airgap magnetic flux of said generator and at least one fuzzy logic controller to generate a flux control signal to vary said airgap flux;
• said means to maintain the speed of said electrical power generator include solid state electronic converters;
• and
• said fuzzy logic control further includes a second fuzzy logic controller to provide a signal for adjusting said variable speed generator for maximum power.