A turbine controller system and method for a fluid-driven power generation unit may include an electrical circuit that connects to a power source and a rotor of a generator of the fluid-driven power generation unit. A turbine control circuit, which may include multiple circuits, may receive data from sensors or from external sources and may generate a signal to control the generator based on a determination that at least one weather condition exists. Control may be effectuated by motoring the rotor of the generator to mitigate a potential impact of the determined at least one weather condition on the fluid-driven power generation unit.

A windmill having a vertical wind turbine is provided. The wind turbine has a housing, a frame, a base, an air system and a sail system. The air system has a compressor, a tank, lines, dampeners and regulators. The sail assembly has a positioner comprised of a shaft assembly and two side assemblies. Each side assembly has arms that are movable relative to each other to adjust the pitch of the first sail relative to the second sail. Adjustment can be made by rotating the two ends of the shaft assembly via rotation of a spiral hex shaft within a spiral hex sleeve. The arms move in relation to the turbine rotational speed to adjust the pitch of the sails. The turbine changes to a closed-fault state (no pitch in sails) if there is an air pressure loss in the air system.