A Unified Approach for Load Frequency Control of Isolated Power System using Delta Time Moment

This paper proposes a unified frame work for identification and control using time moments(TM) in which delta operator is used. Dynamic systems modelling with delta operator provides a unified framework in rapprochement between discrete-time systems and its continuous-time counterpart at fast sampling The theory of delta time moments(DTM) is utilized to develop algorithms for load frequency control (LFC) in the case of power system stabilization (PSS). In electric power generation the system frequency and voltage magnitudes are the most important factors which may be affected by active and reactive power changes. The active and reactive power must be controlled in order to stabilize the power system. Load frequency control (LFC) is used to control the real power for maintaining the desired system frequency. For tracking and control purpose a model reference adaptive control (MRAC) framework is considered. The reference model is developed from the classical time, frequency and complex domain specifications which guarantee both stability and performance in model matching framework. Four control schemes may be defined as i) Inverse control using DTM(ICDTM) ii) Pade Adapted Inverse control using DTM with error feedback (PICDTMEF) iii) Plant Delta Time Moment controller (PDTMC) iv) Pade adapted Delta Time Moment controller with Error feedback (PDTMCEF) have been developed in the proposed work using DTMs for LFC. The algorithms were tested with numerical examples which demonstrate its efficacy. KeywordsDelta time moment (DTM), Inverse control (IC), Load frequency control (LFC), Model reference adaptive control (MRAC), Power System stabilization (PSS).