Implementation and control of a small-scale HVDC lab prototype considering grid code requirements

The number of high voltage direct current transmission (HVDC) installations is growing rapidly nowadays, and network operators are working to define grid codes that regulate behaviors of HVDC system to operate under different conditions. This paper presents implementation of a small-scale HVDC lab prototype, which aims at studying the characteristics of the VSC-HVDC system and meeting the requirements of grid code. Some key requirements in grid code are analyzed. Control strategies and design considerations to meet these requirements are presented in this paper. Finally, the validity of the design and the control strategies is verified by simulation and experimental results.