Introducing LQR-Fuzzy Technique with Dynamic Demand Response Control Loop to Load Frequency Control Model

Abstract

Abstract The present paper indicates a novel approach of LQR-Fuzzy controller to stabilize the frequency in all (normal and emergency) conditions under micro grid environment. Load Frequency Control (LFC) model plays a vital role in electric power system design and operation. From the literature, it is proven that the implementation of DR (Demand Response) is a key to the future micro grid. In practice, LFC-DR model is tuned by conventional controllers like PI, PD, PID controllers, with their fixed gains. However, they are incapable of obtaining good dynamic performance over a wide range of operating conditions and load changes. This paper presents an idea of introducing a DR control loop in the traditional LFC model (called LFC-DR) using Intelligent Controller for a power system. DR communication delay latency in the controller design is considered and is linearized using Pade approximation. The addition of DR control loop guarantees stability of the overall closed-loop system and effectively improves the system dynamic performance. Simulation results show that LQR- Fuzzy Logic Controller based LFC-DR single-area power system have better performance and superiority over a classical controller under any operating scenarios.