International Journal of Scientific Research and Engineering Development

Traditionally, frequency regulation in power system is achieved by balancing generation and demand through load following, i.e., spinning and non-spinning reserves. the future power grid, on the other hand, is foreseen to have high penetration of renewable energy (re) power generation, which can be highly variable. in such cases, energy storage and responsive loads show great promise for balancing generation and demand, as they will help to avoid the use of the traditional generation following schemes, which can be costly and/or environmentally unfriendly. The main goals of load frequency control (lfc) are, to maintain the real frequency and the desired power output (megawatt) in the interconnected power system and to control the change in tie line power between control areas. so, a lfc scheme basically incorporates an appropriate control system for an interconnected power system, which is heaving the capability to bring the frequencies of each area and the tie line powers back to original set point values or very nearer to set point values effectively after the load change. this is achieved by the use of conventional controllers. but the conventional controllers are heaving some demerits like; they are very slow in operation, they do not care about the inherent nonlinearities of different power system component, it is very hard to decide the gain of the integrator setting according to changes in the operating point. advance control system has a lot of advantage over conventional integral controller. they are much faster than integral controllers and also they give better stability response than integral controllers. In this work, a method based on the port-hamiltonian ph system and cascade system that is proposed to design some pid control laws for the multi-area lfc system successfully works out the aforementioned problem. compared with the existed pid methods for the multi-area lfc system, the proposed method has two advantages, which are the decoupling of total tie-line power flow and the robust disturbance rejection. finally the test system is simulated with and without reheated turbine in the environment of matlab simulink to validate the advantages and robustness of proposed method.