초록 ▼

A method and apparatus are disclosed for controlling the rotational speed of gas and steam turbines, and hot gas expanders, with each of these drivers driving a rotational load by way of a shaft. To accomplish this control technique, it is necessary to easily and accurately calculate the amount of p

A method and apparatus are disclosed for controlling the rotational speed of gas and steam turbines, and hot gas expanders, with each of these drivers driving a rotational load by way of a shaft. To accomplish this control technique, it is necessary to easily and accurately calculate the amount of power which must be shed by the driver(s) to maintain a constant speed, i.e., neither accelerating nor decelerating. Action must be taken to reduce the power applied to the shaft by this amount. The method incorporates an open-loop approach and uses a time derivative to moderate the open-loop action accordingly.

대표청구항 ▼

A method to stop an angular acceleration of a driver driving a rotational load by way of a shaft, the entire set of rotational parts having a moment of inertia, I, the method comprising the steps of: (a) measuring an angular speed, N, Of the shaft at various times; (b) recording a sample time betwee

A method to stop an angular acceleration of a driver driving a rotational load by way of a shaft, the entire set of rotational parts having a moment of inertia, I, the method comprising the steps of: (a) measuring an angular speed, N, Of the shaft at various times; (b) recording a sample time between each of these measurements, D2 at each of these sample times; (d) calculating a time derivative, dN2/dt, based on the calculated values of N2 at the various times and the times between each sample, D2/dt by the total inertia, I, of all rotating parts and dividing by two, thereby calculating a difference between a power applied to the shaft and a power extracted from the shaft, DD