Abstract
Microgrids (MGs) may represent a solution in the near future to many problems in the energy and electric world scenarios; such as pollution, high reliability, efficiency and so on. In particular, MGs’ capability to work in an islanded configuration represents one of their most interesting features in terms of the improvement of the reliability of the system, the integration of renewable energy sources and the exploitation of the quick response and flexibility of power electronic devices in a stand-alone system. In order to study and validate innovative solutions and control strategies for islanded operation, there is a need to develop models for MG structures that can be reliable and sufficiently simple to be used for the purpose of the design and validation of innovative control systems. This paper proposes a simplified, first harmonic model for a generic structure of MG characterized by its use of only electronic power converter interfaced generation. The main advantages of the proposed method lie in the model’s simplicity and its reduced solving time, thanks to the limited number of necessary parameters to describe the system. Moreover, the developed formulation allows the avoidance of specific (and often licensed) software to simulate the system. The performances of the proposed model have been validated by means of a comparative analysis of the results obtained against a more accurate representation of the system performed in the power system CAD—electromagnetic transient and DC (PSCAD—EMTDC) environment, which allows for the representation of each component with a very high level of detail. Such comparison has been performed using the University of Genoa Savona Campus Smart Polygeneration Microgrid testbed facility, due to the availability of all the necessary numerical values.
Highlights
The development of renewable energy sources (RESs) and of distributed energy resources (DERs), aimed at the reaching of a reduction in greenhouse gas emissions, has led to a massive growth of microgrid (MG) studies and actual realizations [1,2,3]
ST current profile for the load increasing scenario; the solid lines refer to power system CAD (PSCAD) model while dashed ones refer to the proposed approach
Current for S3; the solid lines refer to PSCAD model while dashed ones refer to the ST current for S3; the solid lines refer to PSCAD model while dashed ones refer to the proposed approach
Summary
The development of renewable energy sources (RESs) and of distributed energy resources (DERs), aimed at the reaching of a reduction in greenhouse gas emissions, has led to a massive growth of microgrid (MG) studies and actual realizations [1,2,3]. The issue of frequency and voltage control and load sharing is more difficult and cannot rely on the scheme adopted for traditional regulation For this reason, a simplified way of representing the dynamic behavior of a MG characterized by only power electronic interfaced generation would represent a useful tool to study and test innovative control strategies for islanded MGs. The present paper aims at developing a simplified model that accounts for all the details typical of a fundamental frequency analysis and is able to handle and to evaluate all the voltage and frequency transients necessary to test a primary regulation scheme. The SPM project represents an important research area for the validation of is being tested in an islanded configuration and analyzed in terms of stability and load sharing This new algorithms, logics and management strategies to provide and improve innovative solutions to portion is represented in Figure and consists of: the problem of the integration of DERs and energy storages; fundamental requirements, for example, to. Both PV2 and the storage have a transformer, whose rated values are 80 kVA, 6%, 200/400 V and 70 kVA, 4%, 400/400 V respectively
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call