Improvement of Rotor Angle Stability and Dynamic Performance of AC/DC Interconnected Transmission System

摘要

this paper illustrates a study on improvement ofrotor angle and dynamic performance of AC/DC interconnectedsystem. High voltage direct current transmission is an economicway for long distance power delivery and/or interconnection ofasynchronous system with different frequencies. With thedevelopment of modern power system, HVDC system plays muchmore important role in power grids due to their huge capacityand capability of long distance transmission. An AC/DC paralleltransmission system and a three-in feed HVDC system aremodeled using PSCAD/EMTDC. Simulations corresponding todifferent situations are performed. From the simulation results,HVDC Light is proven to be able to improve the rotorangle stability and dynamic performance of AC/DCinterconnected transmission system, and support the ACvoltage during the system fault to enlarge the margin of thevoltage stability which is the basic difference from conventionalHVDC. HVDC Light can also prevent commutation failure inmulti-in feed HVDC system and help the recovery of HVDCsystem too.