An automatic load shedding scheme for titan petrochemical industrial plant

In view of increasing in load demand, dependence on the reliable electricity supply and deregulation have forced the need for load shedding to maintain the power system stability and provide good system performance. Under normal operation, the total system generation is the sum of total load and losses in the system. The frequency variation of the power system depends on the active power. On occurrence of any disturbance in the power system, there is imbalance between the generation and load. The difference between the generation and load active power causes a sudden change in the system frequency. A higher deviation in the frequency can affect the performance of the power system and cause overall system to collapse. This project proposes fixed and underfrequency load shedding scheme for TITAN Petrochemical during disturbance in power system. In order to control the frequency drop in severe disturbance, appropriate amount of system load is intentionally and automatically curtailed. In order to improve the response time, accurately predicting the system disturbance and follow with calculating the amount of load to be shed, are very essential. PSCAD I EMTDC software is used to analyze the performance of the designed model and load shedding steps. The result shows that designed load shedding scheme maintained power system performance as such distribution voltage and frequency are within permissible operating limit.