Transient Stability Enhancement Using a Wide-Area Controlled SVC: An HIL Validation Approach

Transient Stability Enhancement Using a Wide-Area Controlled SVC: An HIL Validation Approach

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This paper presents a control scheme of a wide-area controlled static VAr compensator (WAC-SVC) and its 3 gallon flat back bucket real-time implementation in a hardware-in-the-loop (HIL) simulation scheme with three control objectives: (1) to increase the critical clearing time, (2) to damp the power oscillations, and (3) to minimize the maximum line current.The proposed control scheme considers a correction strategy to compensate the delays up to 200 ms.In addition to this, a generator tripping scheme based on synchrophasor measurements to determine the proximity to tasoliesi the loss of synchronism is proposed.A delay compensation algorithm based on polynomial approximations is also developed.

The proposed WAC-SVC is experimentally validated using a Real-Time Digital Simulator platform (RTDS), industrial communication protocols, a commercial device for PMU-based control implementations, and digital relays with PMU capability.The real-time simulation results confirm its effectiveness and feasibility in real industrial applications.Furthermore, practical guidelines to implement this kind of control schemes are provided.