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I. Ngamroo
Electrical Power Engineering Program, Sirindhorn International Institute of Technology, Thammasat University, Pathumthani, 12121 Thailand
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Mathematics

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DESIGN OF ROBUST H? POWER SYSTEM STABILIZER USING NORMALIZED COPRIME FACTORIZATION I. Ngamroo; S. Dechanupaprittha
ASEAN Journal on Science and Technology for Development Vol. 19 No. 2 (2002): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1140.713 KB) | DOI: 10.29037/ajstd.341

Abstract

This paper proposes a new design procedure of robust power system stabilizers (PSS) using H? control via normalized coprime factorization (NCF) approach. The design procedure of the proposed PSS is systematically described. Moreover, the selection method of the weighting function in H? control design is explained in a simple manner. The performance and robustness of the proposed PSS are investigated in comparison with the conventional PSS by examining the case of a single machine connected to an infinite bus (SMIB) system. The simulation results are illustrated to ensure the effectiveness of the proposed PSS. 
Design of A Hvdc-Based Controller for Load Change Compensation and Stabilization of Inter-Area Oscillations I. Ngamroo
ASEAN Journal on Science and Technology for Development Vol. 20 No. 3-4 (2003): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (290.223 KB) | DOI: 10.29037/ajstd.356

Abstract

As an interconnected power system via a High-Voltage Direct Current (HVDC) link is subjected to a rapid load change with the frequency of inter-area oscillation mode, system frequency and tie line power may be severely disturbed and oscillate.  To compensate for the rapid load change and stabilize both frequency and tie line power oscillations due to the inter-area mode, the dynamic power flow control via a HVDC link can be exploited.  To implement this concept, a new design method of HVDC-based controller is proposed.  To grasp a physical characteristic of the inter-area oscillation frequency, the technique of overlapping decompositions is employed to achieve the subsystem embedded with the inter-area mode.  Consequently, the second-order lead/lag controller of HVDC link can be designed in this subsystem.  To acquire the desired overshoot of frequency oscillations, the parameters of the controller are automatically optimized by the Tabu Search (TS) algorithm.  The effectiveness of the designed controller is investigated in a three-area longitudinal interconnected power system which represents the interconnection between the south of Thailand and Malaysia power systems.
Co-Authors S. Dechanupaprittha