DETECTION OF SLUGGISH CONTROL LOOPS IN IRRIGATION CHANNELS

Abstract In this paper we apply the algorithm for detection of sluggish control loops developed in (Hagglund, 1999) to irrigation channels. The controller is a PI controller augmented with a low pass filter together with a decoupling term to reduce the interaction between reaches. In simulations, the algorithm is able to distinguish between well tuned controllers and controllers that give sluggish responses. When applied to real data, filtering and deadzones are included in the algorithm to make it more robust. The modified algorithm is then applied to real data from three consecutive reaches of an irrigation channel, and it detects the control loops which need retuning.

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