Subcycle Dynamic Overvoltage Mitigation via Transformer Secondary Shorting

The patent divides the overvoltage mitigation function into a dedicated standalone device (SDLD) separate from the main SVC/STATCOM system. The SDLD contains only the essential components (switching device, transformer, detector) needed for DOV suppression, while the main reactive power compensation system handles its normal function. This segmentation allows the mitigation function to be performed without requiring the full capability and cost of a complete SVC or STATCOM system.

The patent employs a simple, cost-effective switching device designed for brief operation during DOV events rather than continuous service. The switching device operates only during transient overvoltage conditions (typically less than one cycle), eliminating the need for the expensive, robust construction required in conventional SVC/STATCOM systems designed for prolonged operation. This approach uses a simpler, less expensive component optimized for short-duration duty.

The patent extracts the dynamic overvoltage mitigation function from the comprehensive SVC/STATCOM system and implements it as a separate, dedicated device. The SDLD contains only the switching device, transformer, and detector necessary for DOV suppression, removing the need for complex control systems, multiple switching devices, and other components required for full reactive power compensation. This extraction creates a simpler device optimized specifically for DOV mitigation.

The patent makes the main SVC or STATCOM system universal by enabling it to perform both its traditional reactive power compensation function and the additional DOV mitigation function through integration with the SDLD. The control system can coordinate between the main system and the SDLD, allowing a single integrated solution to handle multiple functions, though the SDLD itself remains a simpler dedicated component.