LAUSR

With the rapid growth of modern power systems and the wide application of high-capacity HVDC systems, the stability, security, and reliability of AC-DC synchronous system may become compromised by various complex faults in the system including the possibility of multi-HVDC blocking faults. Interconnecting two or more large AC power subsystems or transmitting large amounts of energy from power plants directly to load centers through HVDC links is deemed as an effective pathway for expanding the grid and enabling new solutions paradigms. However, a wider adaptation of this new technology also brings many technical challenges, including lack of standardized equipment, the design of versatile control to ensure stability, mismatch of generation and load, interactions between various equipment and their controllers, harmonics, resonances, sub- and super-synchronous oscillations in weak AC systems, etc. Research and development efforts are currently underway in many countries to address these challenges at the system and equipment levels. The areas of focus include the planning, design, construction, modeling, analysis, operation, control, protection, and stability of asynchronous interconnection of modern and future power systems. New high-efficiency topologies and effective measurements are also among the key nontrivial issues when developing practical asynchronous interconnected power systems.