Comparison of dynamic characteristics of virtual synchronous machine control algorithms
Muthukumarana Hewa Thondilege, Theja Thilekha
Renewable energy sources and energy storage systems will hold increasingly significant positions in modern power systems. These systems utilize power-electronic converters as the medium for connection to the grid. The decoupling of the generation and the grid frequency support is a main drawback of conventional converter control topologies. The concept of a virtual synchronous machine (VSM) has gained attention to address this issue in numerous topologies. This thesis provides a detailed insight into several recently proposed VSM algorithms. A VSM categorization is introduced, which can be generally applied to any VSM topology. EMT simulations in PSCAD/EMTDC are carried out to show the performance of the selected key VSM algorithms for large-signal disturbances. The selected VSM algorithms are tested explicitly for grid-forming functionality. Their performances are compared against the conventional synchronous machine. The results show the impact of controller parameters on VSM’s performance and possible ways of improvements.