Comparing strategies to damp electromechanical oscillations through STATCOM with multi-band controller.

Area of Science:

• Electrical Engineering
• Power Systems

Background:

• Low-frequency electromechanical oscillations pose a significant challenge to the stability of multi-machine power systems.
• Static Synchronous Compensators (STATCOM) are effective devices for enhancing power system stability.

Purpose of the Study:

• To compare two distinct control strategies for damping low-frequency electromechanical oscillations using a STATCOM equipped with a multi-band controller.
• To evaluate the effectiveness of modulating voltage versus phase angle for oscillation damping.

Main Methods:

• STATCOM modeled as a controllable voltage source behind an impedance.
• A multi-band controller designed to act as a power oscillation damper.
• Two strategies implemented: voltage modulation and real power-control loop modulation.
• Coordinated design of controllers and power system stabilizers via optimization under various operating conditions.

Main Results:

• The study provides a comparative analysis of the two proposed STATCOM control strategies.
• The optimization approach ensures robust performance across different operational scenarios.
• Effectiveness of each strategy in damping electromechanical oscillations is evaluated.

Conclusions:

• Both strategies demonstrate potential for damping electromechanical oscillations.
• The choice of strategy may depend on specific system requirements and operational contexts.
• The coordinated design approach enhances the overall stability performance.