Taming Inverse Response

Abstract

Until recent years, inverse response has always been the largest problem in a boiler plant. Only the largest boilers could justify sophisticated boiler controls. Its high fuel costs and limited fuel availability make it necessary to improve boiler efficiency. Drum level controls have become more important because boiler loads are being varied to meet needs, rather than operating at full capacity and wasting fuel and steam. An inverse response has always been an evergreen challenge for the instrumentation engineers. The efficiency of an industrial plant like in boilers plants directly depends upon the way inverse response is handled. The inverse response is controlled by manipulating its parameters so that the errors and the offset are minimal. This paper presents a novel method to compensate the inverse response of the process comprising of two opposite first order systems with a delay element. The compensator for inverse response designed with both accurately and inaccurately estimated parameters. This is simulated in MATLAB SIMULINK and checked for its efficacy.