Enhanced stand-alone operating characteristics of an engine generator interconnected through the inverter using virtual synchronous generator control

Abstract

In power systems, the engine generator plays an important role such as providing power at the time of power failure and at the stand-alone operating system. In using the engine generator for stand-alone system, there are upper and lower limits in the engine speed variation. As a result, if the engine speed exceeds the value, the engine generator comes to unstable and cannot go on the operation. So when we place a load on engine generator, we have to take the engine speed variation limit into consideration, as a result, the amount of the load come to be limited. In this research, we attempt to reduce the deviation of engine speed during the transient by using the energy storage system (ESS) which is used in the system of inverter control. In this paper, control scheme of ESS is shown and the simulation and experimental result are also shown with comparison between simulation and experiment as a result.

Sharing VSG Operation with Synchronous Generator

“…By controlling the output of the converter, the action of a traditional SG is emulated. In this definition, when there are changes in the operating conditions or when disruptions occur in the power grid, the DG can be handled by the converter to exhibit responses close to that of a real synchronous machine [4][5][6].…”

Transient Analysis of Microgrids With Parallel Synchronous Generators and Virtual Synchronous Generators

“…Unfortunately, the mechanism of the instability for parallel SG and VSG units has not been clearly revealed. In [13] and [14], the inertia difference between inverters and SGs was analyzed, where the frequency oscillation and poor transient power sharing were discussed. Moreover, the VSG control system was introduced to achieve better inertia response characteristic.…”