Research On VSC-HVDC Improving The Power System Stability Of Frequency And Voltage

During the period of load restoration under black start, it is very important to enhance the stability of frequency and voltage for the network restoration. In this paper, the physical model of VSC-HVDC during load restoration period is built. Based on the characteristic of VSC-HVDC, which is it can control active and reactive power independently and simultaneously, the strategy of coordination control of VSC-HVDC and generator's governor and excitation system is proposed. Simulation results in PSCAD/EMTDC show that the stability of system frequency and voltage are improved using the method. Aiming at induction motor, the strategy of system coordination control of VSC-HVDC and generator is adopted. Simulation results show that the stability of frequency and voltage can be improved through this strategy.