Title :
Dynamic performance of a modular multilevel back-to-back HVDC system
Author :
Saeedifard, Maryam ; Iravani, Reza
Abstract :
The modular multilevel converter (MMC) is a newly introduced switch-mode converter topology with the potential for high-voltage direct current (HVDC) transmission applications. This paper focuses on the dynamic performance of an MMC-based, back-to-back HVDC system. A phase-disposition (PD) sinusoidal pulsewidth modulation (SPWM) strategy, including a voltage balancing method, for the operation of an MMC is presented in this paper. Based on the proposed PD-SPWM switching strategy, a mathematical model for the MMC-HVDC system, under both balanced and unbalanced grid operation modes, is developed. Dynamic performance of the MMC-based back-to-back HVDC converter system, based on time-domain simulation studies in the PSCAD/EMTDC environment, is then evaluated. The reported time-domain simulation results show that based on the adopted PD-SPWM switching strategy, the MMC-HVDC station can respond satisfactorily to the system dynamics and control commands under balanced and unbalanced conditions while maintaining voltage balance of the dc capacitors.
Keywords :
HVDC power convertors; PWM power convertors; switching convertors; time-domain analysis; DC capacitors; MMC-based back-to-back HVDC converter system; PD-SPWM switching strategy; PSCAD-EMTDC environment; high-voltage direct current transmission applications; mathematical model; modular multilevel back-to-back HVDC system; modular multilevel converter; phase-disposition sinusoidal pulsewidth modulation strategy; switch-mode converter topology; time-domain simulation; unbalanced grid operation modes; voltage balancing method; Electric potential; HVDC transmission; Mathematical model; Pulse width modulation; Simulation; Switches; Time domain analysis;
Conference_Titel :
Power and Energy Society General Meeting, 2011 IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4577-1000-1
Electronic_ISBN :
1944-9925
DOI :
10.1109/PES.2011.6038879