Parameter estimation of regulators in Tian-Guang HVDC transmission system based on PSCAD/EMTDC

The ±500 kV bipolar, direct current Tian-Guang HVDC transmission system with a rating of 1800 MW was been put into operation by the middle of 2001. Constant current regulator, constant voltage regulator and constant extinction-angle regulator are three basic regulators which determine the regulative performance of the HVDC transmission system. They are all PI regulators in Tian-Guang HVDC transmission system. The parameters of three PI regulators, i.e. gain Kp and time constant Tn have a notable effect on the their characteristics, so the parameter estimations of these regulators are very necessary. This paper points out that PSCAD/EMTDC is an excellent software for parameter estimation of the regulators in an HVDC transmission system. Based on this software, the parameters of three basic regulators in Tian-Guang HVDC transmission system are estimated. The results of the estimation which are presented in this paper are able to meet the requirements of project technique criterion.