Design of a robust modulation controller over a wide range of load characteristics for ac/dc systems

Journal Article · Thu Feb 01 04:00:00 EST 1990 · IEEE Transactions on Power Systems (Institute of Electrical and Electronics Engineers); (USA)

DOI:https://doi.org/10.1109/59.49108· OSTI ID:6927615

Choudry, M A; Reza, M A ^[1]; Ellithy, K A ^[2]

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1. West Virginia Univ., Morgantown, WV (USA). Dept. of Electrical Engineering
2. Sultan Qaboos University, Dept. of Electrical and Electronics Engr., Muscat, Sultanate of Oman (OM)

This paper presents a method to design a robust modulation controller to improve the dynamic performance of ac/dc systems. Static load is modeled as a nonlinear function of load bus voltage and dynamic load is modeled by an equivalent induction motor. Reactive power and dc power are considered for the modulation control. Static var compensator (SVC) is used for the reactive power modulation. The rotor speed and angle deviations of the synchronous generator are used as a stabilizing signal to the SVC. The controller gains are selected based on the eigenvalue sensitivity of electromechanical mode of the closed loop system with respect to load characteristic. Eigenvalue analysis and simulation results show that the proposed reactive power modulation control improves the system response over a wide range of voltage dependent load characteristic as compared with the control using only the rotor speed deviation.

• OSTI ID: 6927615
• Journal Information: IEEE Transactions on Power Systems (Institute of Electrical and Electronics Engineers); (USA), Journal Name: IEEE Transactions on Power Systems (Institute of Electrical and Electronics Engineers); (USA) Vol. 5:1; ISSN 0885-8950; ISSN ITPSE
• Country of Publication: United States
• Language: English

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AC SYSTEMS
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DYNAMIC LOADS
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