H-bridge Cascaded Voltage Source Inverter Virtual Synchronous Generator Control with Selective Harmonic Elimination

Solution of synchronous generator and network energy accumulator synchronization problem based on eleven-level cascade H-bridge inverter controlled by method of virtual synchronous generator is considered. In order to generate voltage at the output of the power network accumulator, a solution to the problem of selective harmonic elimination in a wide range of amplitude of the first harmonic is obtained. Combined with a large number of linear voltage levels, the use of selective harmonic elimination method can both eliminate the need to use a passive filter at the output of the accumulator, and reduce the loss of the power inverter without reducing the voltage quality. The method of virtual synchronous generator made it possible to achieve unstressed synchronization and distribution of active and reactive components of loads between the synchronous generator and the network energy storage. All conclusions are confirmed by the results of mathematical modeling. Selective harmonic elimination method was verified on a developed physical prototype of a single-phase cascade inverter.