Digital Rotor Velocity and Acceleration Measurement for Generator Control

This paper describes the design and development of digital signal processing algorithms for synchronous generator rotor velocity and acceleration measurement. The system employs a microprocessor and is designed with control applications in mind. The rotor acceleration is derived by taking the first derivative of the velocity signal. The velocity measurement is by a time division algorithm. Since the differentiation by most numerical methods tend to generate noise, a simplified least squares procedure is utilised together with a moving average and a decimation. The algorithms are relatively simple and can be implemented in realtime using microprocessors.