Abstract
Dynamic Performance Evaluation of Decentralized Load Frequency Controllers for Interconnected Thermal Power System with Parallel AC-DC Tie-lines: A Comparative Study
Highlights
The Load Frequency Control (LFC) problem is of vital importance for power engineers because of the large size and complexity of interconnected systems
The system is simulated with various controllers for 0.01 p.u.MW step load change in area 1 and the corresponding frequency deviation and tie-line power deviation are plotted with respect to time
The responses of frequency deviation in area 1 (∆F1), frequency deviation in area 2 (∆F2), AC tie line power deviation in area 1 (∆Pac1) and DC tie line power deviation (∆Pdc1) of the system are shown along with the responses obtained with the optimal decentralized proportional plus integral controller designed based on Integral of the Squared Error (ISE) criterion in Fig. 9 to 11
Summary
The Load Frequency Control (LFC) problem is of vital importance for power engineers because of the large size and complexity of interconnected systems. Unpredictable changes in the load demand occur continuously in interconnected power systems. These changes in load always cause a mismatch between power generation and consumption, which adversely affects the quality of generated power in several ways. The frequency deviation and the deviation in scheduled tie line power are the most important. The objective of LFC in interconnected power systems is twofold: minimizing the transient errors in the frequency and the scheduled tie line power and ensuring zero steady state errors of these two quantities. The main desirable features of decentralized LFC are the following:
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