Modeling and Control of Integrated STATCOM-SMES System to Improve Power System Oscillations Damping

MOLINA, MARCELO GUSTAVO; MERCADO, PEDRO ENRIQUE

JOURNAL OF ELECTRICAL ENGINEERING & TECHNOLOGY

KOREAN INST ELECTR ENG

Lugar: Seúl; Año: 2008 vol. 3 p. 528 - 537

1975-0102

Primary frequency control (PFC) has the ability to regulate short period random variations of frequency during normal operation conditions and response to emergency rapidly. However, in the last decade, many large blackouts happened worldwide that led to serious economic losses. It allows concluding that the ability of current PFC to meet an emergency is poor, and security of power system should be improved. An alternative to enhance the PFC and thus security is to store exceeding energy during off-peak load periods in efficient energy storage systems for substituting the primary control reserve. In this sense, superconducting magnetic energy storage (SMES) in combination with a static synchronous compensator (STATCOM) is capable of supplying power systems with both active and reactive powers simultaneously and very fast, and thus is able to enhance the security dramatically. In this paper, a new concept of PFC based on incorporating a STATCOM-SMES is presented. A full detailed model is proposed and a new control scheme is designed, comprising an enhanced frequency control scheme, a full decoupled current control strategy in d-q coordinates with a novel controller to prevent dc bus capacitors voltage drift/imbalance. The performance of the proposed control schemes is validated through digital simulation carried out by using MATLAB/Simulink.