DESIGN OF CONTROL STRATEGIES FOR THE LOAD FREQUENCY CONTROL (LFC) IN MULTI AREA POWER SYSTEM FOR PARALLEL OPERATION OF POWER PLANTS

This paper features the Differential Evolution (DE) by controller parameters tuning algorithm and also an application of a multi source power system to a Load Frequency Control (LFC) by having several sources of power generation techniques. At first, a single area multi-source power system using integral controllers for every unit is taken and DE procedure is implemented to attain the controller parameters. Several mutation procedures of DE are estimated and the control parameters of DE for best obtained procedure are tuned by implementing numerous runs of algorithm for every change in parameter. Multi-area multi-source power system is also discussed and a HDVC link is also taken in accordance with the current AC tie line for the internal connection between the areas. The two variables of Integrals which are to be enhanced using tuned DE algorithm are proportional integral and proportional integral derivative. The advantage of the proposed strategy has been exposed by estimating the results with the freshly published enhanced output feedback controller for the similar power systems. Further, the assessment is conducted by performing several procedures like overshoot, tie line power derivation followed by a step load perturbation (SLP), settling time and standard error criteria of frequency. It is also observed that, the maximum output of the feedback controller is less than the dynamic performance of the proposed controller. Additionally, the proposed power system is not affected by altering the loading conditions, size of SLP and system parameters.