PSCAD应用实例(Part1).pptVIP

Manitoba HVDC Research Centre Manitoba HVDC Research Centre Obsolete two content layout Manitoba HVDC Research Centre Click to edit Master title style Manitoba HVDC Research Centre Click to edit Master title style Manitoba HVDC Research Centre Click to edit Master title style Manitoba HVDC Research Centre Simulation Fundamentals Fundamentals of Electro-Magnetic Transients in Electric Networks and EMT Programs Dharshana Muthumuni, Ph.D, P.Eng Manitoba HVDC Research Centre Winnipeg, Manitoba Canada Typical Applications Switching Studies Insulation Coordination Studies Breaker TRV Studies Network frequency scans Due to switching actions Re-distribution of stored energy in L- C elements Insulation failure of equipment Switching instant has an impact on the magnitude Damping due to loads and losses Use of MOV to suppress stress Switching (SOV) and Temporary Over-Voltages (TOV) AC System Studies Switching Studies AC System Studies Transients due to switching actions Line energizing Capacitor bank switching Breaker re-strike Transformer energizing Fault clearance PSCAD simulations studies are used to select or design surge arresters (MOV) ratings Inrush/outrush limiting reactors damping resistors Switching Studies AC System Studies PSCAD Model Requirements Typically, the system is modeled at least up to 2 buses away from the bus under study Network equivalences based on load flow and fault data Model validation Detailed transmission line representation Transformer saturation and other details MOV characteristics Station equipment stray capacitance Switching Studies AC System Studies Typical ‘worst’ cases Open end voltage at lone lines (Ferranti effect - TOV) Energizing ‘large’ transformers from the HV side (TOV) Re- energizing a line (with trapped charge) Capacitor bank re-strike Switching Studies Transformer Related Issues PSCAD Transformer models are detailed and represent: Non linear B-H properties of the core material Core type of the trans