Simulation and Analysis on ±800KV Jinpin-Suzhou UHVDC Mono-Polar Block Fault on June 17

Abstract

Mono-polar block or bipolar block is common fault for high voltage direct current (HVDC) transmission system, which will result in serious problems and have severe effect on security and stability of power system. The Jinpin-Suzhou ultra-high voltage direct current(UHVDC) transmission project has effectively alleviated the power shortage of Jiangsu province that with receiving-end power grid, in order to simulate the operation status of Jiangsu power grid after mono-polar block of Jinpin-Suzhou UHVDC system in June 17,2016,the online dynamic security assessment system(DSA) is adopted, the frequency characteristics, bus voltage, transient response of the unit, and the power flow of transmission lines are analyzed from three moments: pre-fault time, fault time and steady state after fault, and the simulation results are compared with the actual recorded values by PMU, the actual failure process is successfully reappeared, the results can provide technical support for improving the safe operation level of Jinpin-Suzhou UHVDC system.