Abstract
Increasing the penetration level of distributed generation units as well as power electronic devices adds more complexity and variability to the dynamic behavior of the microgrids. For such systems, studying the transient modelling and stability is essential. One of the major disadvantages of most studies on microgrid modelling is their excessive attention to the steady state period and the lack of attention to microgrid performance during the transient period. In most of the research works, the behavior of different microgrid loads has not been studied. One of the mechanisms of power systems stability studies is the application of state space modelling. These studies include the development of state space models of various components of the power system and then linearizing them around an equilibrium point. In this paper, a comprehensive method for modelling of islanded microgrid with dynamic and static loads is presented. The basic step of the proposed method is transformation to a dq0-based model. In order to find a complete and accurate model of islanded inverter-based microgrid, the sub-modules of generation, network and load must be modelled in local dq reference and then transferred to a common reference. The simulation results show the effectiveness of the proposed modelling approach for transient stability studies.
Highlights
Today's modern world needs high quality electricity and reliability desperately
Active distribution networks or microgrids are referred to as low voltage networks, including distributed generation units such as wind turbines, solar power plants, micro turbines, energy storage devices such as batteries, flywheels, super capacitors, sensitive loads and interruptible loads that are connected to an upstream medium voltage grid by a transformer
Unlike other papers that dealing with the dynamic modelling of microgrid (Bani-Ahmed, Rashidi, & Nasiri, 2019; Bassey, Butler-Purry, & Chen, 2019; Bracco & Delfino, 2017; Juneja, Nagar, & Mohanty, 2019; Macana, Mojica-Nava, Pota, Guerrero, & Vasquez, 2019; Magdy, Mohamed, Shabib, Elbaset, & Mitani, 2018; Shuai, Peng, Guerrero, Li, & Shen, 2018), this paper explores the dynamic response of induction motors, completely
Summary
Today's modern world needs high quality electricity and reliability desperately. The importance of energy, greenhouse gas emissions, environmental pollution, non-renewability of fossil fuels, degradation of transmission and distribution network equipment and the need for large investments to develop and modernize their basic infrastructure on the one hand and on the other hand, the need for high-quality electricity and reliability has made the use of renewable energy units as a source of electricity in many developed countries. In (Serra, et al, 2014), a new non-linear control strategy is proposed to connect the renewable energy sources to the network. In (Smith & McCann), the authors propose a new control method to increase the stability of a two-level converter of renewable energies in order to improve the transient state of the connected mode to the islanding mode. In (Nguyen, Nguyen, Yoo, & Kim, 2018), a new control strategy based on the theory of virtual synchronous generator is proposed to improve the transient response of power converters in the presence of a large disturbance in the islanding mode. In (Alam, Moreira, Islam, & Mehedi), the development of appropriate simulation models and methods for investigating the dynamics of microgrids in transient stability has been performed This is to investigate the interaction of the microgrid in connected and islanding operation modes. The model consists of three sub-modules: generation sub-module, network sub-module and load sub-module
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