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An integrated tool for optimal energy scheduling and power quality improvement of a microgrid under multiple demand response schemes
ابزاری یکپارچه برای برنامه ریزی بهینه انرژی و بهبود کیفیت انرژی ریز شببکه تحت برنامه های پاسخگویی به تقاضای چندگانه-2020 This paper presents an integrated tool to mitigate power quality issues in a microgrid through coordinating the
operating schedule of its generating resources and loads. Such a microgrid includes renewable and conventional
distributed energy resources, electric vehicles, energy storage, linear and nonlinear loads, while it serves as an
example small-to-medium scale residential and commercial buildings. The proposed tool operates on a sequential,
two-stage basis: at the first stage the energy management system (EMS) ensures that the microgrid’s
generation resources and loads are dispatched at the minimum total system cost. In addition, it assesses the
potential provision of flexibility services towards the system operator, relying on financially incentivized power
signal requests. At the second stage, the power quality (PQ) framework evaluates whether the proposed optimal
solution complies or not with several PQ standards applicable to the distribution level. The unique characteristic
of the proposed tool is the self-triggered interaction between the EMS and the PQ framework, which identifies
potential PQ violations, and restores the PQ indices to acceptable levels through an iterative process. Case
studies have been performed with realistic model parameters to verify the performance of the proposed integrated
tool. The obtained results demonstrate the effectiveness of the algorithm in managing voltage deviations,
voltage unbalance, as well as harmonic distortions with a small additional cost for the total system. Keywords: Buildings-to-grid integration | Energy management system | Harmonic distortion | Optimization | Power quality | Smart grid |
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