Market oriented model of multiple microgrid distribution system considering quality of electric energy supplyAŠČERIĆ, AMER (Avtor) Čepin, Marko Tomaž (Mentor) Active distribution systemsMarket-oriented coordinationMicrogrid ancillary servicesEnergy storage systemsOperational reliabilityCongestion managementVoltage regulationReactive power dispatchGenetic algorithm optimizationLocal flexibility marketsThe ongoing transformation of electric power systems, driven by the rapid expansion of renewable energy sources and the decentralization of generation, has fundamentally altered the operational paradigm of distribution networks. Traditionally designed for passive operation and unidirectional power flows, modern distribution systems increasingly host distributed generation units, energy storage systems, and interconnected microgrids. This transition introduces bidirectional power exchange, operational variability, and stronger coupling between technical constraints and market dynamics. Consequently, ensuring system reliability and maintaining acceptable quality of supply under high renewable penetration has become a critical challenge. This dissertation investigates the feasibility and effectiveness of a market-oriented coordination framework for multi-microgrid distribution systems. The central objective is to develop and validate an integrated operational model that enhances distribution system reliability and quality of supply while simultaneously generating economic benefits for key stakeholders, including distribution system operators and microgrid owners. Particular emphasis is placed on the role of energy storage systems as enablers of flexibility-based congestion management and providers of distribution-level ancillary services encompassing both active and reactive power dispatch. Modern battery inverters are capable of independently controlling active and reactive power output, enabling simultaneous management of thermal and voltage constraints through a single coordinated optimization framework. The proposed framework integrates reliability assessment, market-oriented coordination mechanisms, and optimization-based microgrid operation within a unified analytical structure. Reliability indicators related to line loading and voltage constraints are explicitly embedded into the optimization model rather than treated as post-processing metrics. A penalty-based mechanism internalizes the economic consequences of congestion, voltage violations, and unserved energy, thereby translating technical system needs into market-oriented signals. Coordinated energy storage dispatch is employed as the primary control lever for mitigating thermal overloads and supporting voltage stability while preserving microgrid autonomy. The methodological approach combines power system modelling with simulation-based analysis over an annual time horizon. Due to the non-linear and non-convex nature of the optimization problem, a genetic algorithm is implemented to determine coordinated storage operation schedules under dynamic price signals and network constraints. Comparative evaluation between reference and coordinated scenarios enables quantitative assessment of both technical and economic impacts. The results demonstrate that distribution line congestion represents a particularly significant mechanism influencing overall quality of supply affecting overall quality of supply, while voltage violations exhibit strong correlation with congestion events, indicating substantial coupling between thermal constraints and voltage quality. Coordinated microgrid operation significantly reduces the frequency and severity of overload events, leading to measurable improvements in system reliability and voltage performance. The improvement in voltage constraint compliance is directly attributable to the combined effect of active power reshaping, which reduces resistive voltage drops along distribution feeders, and reactive power dispatch by storage inverters, which provides direct voltage regulation support at critical buses. These technical improvements directly translate into reduced penalty-related costs for the distribution system operator and enhanced economic performance for microgrid owners through flexibility compensation mechanisms. Furthermore, reduced thermal stress on network components indicates the potential for postponing infrastructure reinforcement investments, positioning coordinated microgrid flexibility as a viable non-wire alternative to conventional grid expansion. The integrated findings confirm that reliability enhancement and economic efficiency are mutually reinforcing outcomes within a properly designed market-oriented coordination framework. By aligning stakeholder incentives with distribution system constraints, the proposed approach provides a technically robust, economically rational, and scalable solution for managing active distribution systems with high penetration of interconnected microgrids.20262026-10-06 14:55:07Doktorsko delo/naloga189414sl