SYSTEMATIC APPROACH FOR IDENTIFICATION OF VOLTAGE COLLAPSE AREAS AND THE REACTIVE POWER RESERVE REQUIREMENTS IN LARGE INTERCONNECTED TRANSMISSION GRID

摘要

The paper describes a methodology for identifying areas in power systems that are prone to voltage instability under particular operating conditions and contingencies. These areas, which are prone to instability due to exhausted reactive power reserves under stressed operating conditions, are referred to as critical Voltage Control Areas (VCAs). Once VCAs are identified, a method of determining reactive power reserve requirements to ensure secure system operation under all conditions is applied. The approach is as follows: Define a system operating space based on a wide range of system loads, generations dispatch, and defined transactions (source-to-sink transfers); Define a large set of contingencies that spans the range of credible contingencies; Using PV curve method, push the system through every condition, under all contingencies until the voltage instability point is found for each condition At the point of instability for each case (nose of the PV curve) perform modal analysis to determine the critical mode of instability as defined by a set of bus.