A Dynamic Model and Control Strategy for the Combined Multipulse Multilevel Converter Based HVDC System

The multipulse multilevel converter topology is a newly introduced converter topology with the potential for high voltage direct current (HVDC) transmission applications. This paper focuses on harmonic reduction, control and design of multipulse multilevel converters for the realization of HVDC systems. Dynamic performance of the proposed converter based HVDC system with nominal power of 100 MW and voltage of 33 kV, 50 Hz is evaluated in the MATLAB/Simulink environment. The simulation results show that with the proposed converter topology and control strategy used, the HVDC station can respond satisfactorily to the system dynamics and control commands under steady state and dynamic load conditions while maintaining voltage balance of the DC capacitors.