Model‐based control of a VSC‐based power generator with synthetic inertia provision in an isolated micro‐grid

Abstract

Distributed energy resources such as solar PV, wind and energy storage systems are increasingly being utilized within isolated and grid-connected microgrids. Their integration has prompted the move towards more advanced coordinated control for flexible, efficient and secure operation of microgrid-based power systems. This paper presents a new power control method based on a canonical inverse-model and implied synthetic inertia (SI), which is implemented on a VSC-based power generator (VSC-PG) for frequency response support. The control method augments a traditional power controller whilst the SI technique is blended with a new switching mechanism which enhances the performance of the VSC-PG when it is utilized with SI provision capability. The switching mechanism acts only when necessary, without contradicting the main frequency regulating sources. For assessment, the above method and SI technique have been designed and modelled for a 630kVA VSC-PG with DC-link batterybank. The VSC-PG was connected within an isolated/remote microgrid formed by an 11kV feeder, 1MVA diesel generator and variable load. The performances of the proposed power controller and SI provider have been tested and analysed using detailed Matlab/Simulink simulations and found to compare favourably with methods published in the literature.

Control and operation of a ship AC/DC microgrid under transient propulsion and manoeuvring load conditions

“…Both the DC-DC converter and the VSC have their own power controllers designed with typical response times in the range from 1.5ms to 3ms. For the VSC, power control is possible using different techniques, [34]- [38], but the method in [34] was adopted for this paper due to its modular design using a simple per-unit structure. Details of the power controller for the DC-DC SC converter are presented in section 6.…”