Moving Lean Instant Slope Constant Estimator for Fast Online Measurement of Derivative and Absolute Value of Oversampled Signals

In this paper an improved moving, non-recursive Least Squares Estimator is presented that is very lean in its implementation, requires very low computational effort and has very low latency after the last sample of a measurement interval. It is very well suited for fast online measurement of the first derivative and the absolute value of measurement signals in power electronics and drives applications such as current slopes, which can then be used for online parameter identification of electrical machines, adaptive control, fast HIL and PHIL control, condition monitoring or fault detection.