主权项 |
1. An electrical generator comprising:
a turbine; a core; a rotor, driveable by the turbine; a rotor speed sensor that measures a turbine rotation speed and that outputs a first signal that identifies a measured turbine rotation speed; a stator having stator windings, and an electrical circuit, connected to the stator windings and presenting a load impedance to the stator windings, wherein a real component of the load impedance presented to the stator windings includes one or more resistive elements and wherein a reactance of the impedance presented to the stator windings includes one or more capacitive elements; and a controller that includes a memory that includes a lookup table storing characteristics associated with at least a magnetization of the core and a flux density of the core, wherein the controller receives the first signal from the rotor speed sensor and receives a second signal from the stator, accesses the lookup table based on the first signal and the second signal, and determines a first output and a second output from the lookup table, wherein the controller controls the selection of the impedance of the electrical circuit based upon the first output and the second output so that the generator produces a generator output whose voltage and frequency varies with wind speed across a predetermined range of wind speeds, whilst a power output remains at or adjacent a peak power output of the generator across that predetermined wind speed range, wherein the controller selects, based on the first output, at least one of the one or more capacitive elements such that a power/speed line of the electrical generator is aligned at or near a maximum of a power/speed curve for a prevailing wind speed within the predetermined wind speed range, and wherein the controller switches, based on the second output, the one or more resistive elements to modify a magnetic-non-linearity-induced slope of the power/speed curve for the prevailing wind speed. |