Variable-structure-system control applied to AGC of an interconnected power system

A control scheme based on a variable-structure-system concept is applied to the problem of automatic generation control of interconnected power systems. The proposed algorithm is simple and easy to implement. The effect of generation-rate-constraint nonlinearity on the dynamic performance of the system for reheat- and nonreheat-type steam turbines is also studied. A comparison of the conventional and the proposed variable-structure control strategies shows that, with the application of the proposed algorithm, the system performance is improved significantly.