Control of islanded microgrids considering power converter dynamics

Abstract

In this paper, the control problem of Islanded Microgrids is approached. A controller scheme that considers the necessity to assure the generation of grid-forming nodes as well as the proper operation of grid-following nodes is proposed. The main feature of the contribution is the explicit inclusion of the dynamic of the power converters existing in this kind of networks making possible the evaluation of the system performance under sudden and fast changes in the operating conditions typically found in these applications. The scheme uses only the measurement of local variables and guarantees that both voltages and currents of the network achieve the values required to satisfy a prescribed power balance imposed by the loads. The design of the proposed controller is carried out by exploiting a Port-Controlled Hamiltonian representation of the system and applying the Passivity-based Controller design methodology. The stability properties of the closed-loop system are formally proved and its usefulness is illustrated via numerical simulations.

Keywords:

• Microgrids
• Hamiltonian systems
• passivity-based control

Disclosure statement

No potential conflict of interest was reported by the authors.

Notes

1 The choice of only including voltage-fed converters is for the sake of clarity of presentation since the main objective is to show that the generation of the grid-forming and grid-following nodes is achieved.

Additional information

Funding

Part of this work was supported by DGAPA-UNAM under PAPIIT grants IN118019-IA103519.