الفهرس 
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Abstract
Renewable energy resources play a vital role in current power systems, driven by their techno-economic, sustainability, and eco-friendly advantages. Nowadays, the energy generation mix has been upgraded in many countries, such as Germany, Australia, the United Kingdom, and Egypt to include more renewable distributed generation (DG) units instead of the conventional fossil fuel-based resources to solve various challenges such as the future energy needs, the remarkable oil price fluctuations, and the increasing fossil-fuel pollution risks. However, the unplanned and excessive DG penetration may turn the DG advantages into disadvantages with possible operational hazards such as the increased overvoltage risks, overloading of electrical equipment, reverse power flows with their negative impacts on the network’s protection schemes and power quality (PQ) problems associated with the excessive DG integration. The electrical systems are highly vulnerable to these risks when the DG penetration exceeds the maximum allowable level that ensures safe and reliable operation, so-called the system’s hosting capacity (HC) limit.
In this thesis, the HC research, developments, assessment techniques and enhancement technologies are investigated.
The thesis starts with a comprehensive state-of-the-art literature review of the HC concept and its developments, the main HC performance limits, the HC assessment procedure and the HC enhancement techniques. In addition, practical experiences of electrical system operators, energy markets and outcomes gained from real case studies are presented and discussed.
Afterwards, the HC enhancement using the network reinforcement techniques was investigated in a real radial distribution system in Egypt. A novel feeder reinforcement index is proposed to assist the distribution system operators and planners to determine the feeders that first need to be reinforced.
Finally, the probabilistic hosting capacity (PHC) enhancement using harmonic mitigation techniques was assessed in a non-sinusoidal power distribution system. A C-type harmonic filter is proposed to maximize the harmonic-constrained PHC. An optimization problem is formulated using Monte Carlo simulation taking into account various uncertain parameters such as the intermittent output power of the DGs, background voltage harmonics, load alteration, and the filter parameters’ variations. Different operational constraints have been considered such as bus voltage, line thermal capacity, displacement and true power factors, and individual and total harmonic distortion limits.