Implementation of a Stable Solar-Powered Microgrid Testbed for Remote Applications

Hossein Saberi, Hamidreza Nazaripouya and Shahab Mehraeen
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Hossein Saberi: Department of Electrical and Computer Engineering, Louisiana State University, Baton Rouge, LA 70803, USA
Hamidreza Nazaripouya: School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, OK 74078, USA
Shahab Mehraeen: Department of Electrical and Computer Engineering, Louisiana State University, Baton Rouge, LA 70803, USA

Sustainability, 2021, vol. 13, issue 5, 1-17

Abstract: An intrinsically stable microgrid, operated by inverter-interfaced distributed energy resources (I-DERs) is introduced in this paper. The microgrid is built upon a systematic design method, which is adapted from the operation of the synchronous machine (SM). The proposed method analogizes the dynamics of the dc-link in I-DERs to the rotor dynamics in synchronous generators (SGs) and utilizes the capacitor as energy storage. Thus, the proposed mechanism relaxes battery usage for frequency control, and by using the capacitive stored energy, provides a high fault ride-through capability, which is suitable for both on-grid and off-grid applications. Based on stability analysis of the SG and the dynamic state matrix eigenvalues for multimachine power system, the dc-link capacitor of I-DERs is characterized in the context of microgrid. The dc-link capacitor stores kinetic energy similar to the rotor of the SG and provides inertia in transients without the need of battery storage. The inverter angle responds to the change of the dc link voltage (energy). The dc-link voltage is then controlled similar to the field control pertaining to the SG. Finally, a governor-like mechanism is applied to maintain dc-link voltage stability. Simulation and experimental results are provided to show the effectiveness of the proposed design mechanisms.

Keywords: distributed generation; virtual synchronous machine; voltage source inverters; microgrid stability; solar power (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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