Loop slope adjustment methods for the control of Automatic Voltage Regulator

This paper explores well known PID tuning algorithms based on loop slope adjustment and its application to the control of Automatic Voltage Regulator for both set point tracking and disturbance rejections. Four different PID tuning algorithm viz. Zeigler Nichols Method, Modified Ziegler-Nichols, Bode´s Integral based method and Flat phase method were considered. Each of these methods gives a new approach to relate T_i and T_d apart from achieving desired specifications. Performance comparison was carried out considering some well known performance criteria.