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Energy and environment continue to be major issues of human mankind. This holds true on the regional, the national, and the global level. And it is one of the problems, where engineers and scientists in conjunction with political will and people's awareness, can find new approaches and solutions to save the natural resources and to make their use more efficient.
Supervisory control and data acquisition (SCADA) data has been widely applied to identify abnormal conditions in wind turbine generators (WTG). One approach was to apply Artificial Intelligence (AI) to SCADA data, comparing the predicted power output of a WTG and its actual output and using the prediction error as an indicator to detect faults. However, complicated training processes limit its application...
Perturb and Observe (P&O) method is a commonly employed technique in module integrated maximum power point tracking (MPPT) system. But the method suffers from the problems of oscillations around the maximum power point (MPP) during the steady state. Various methods have been reported in the literature to overcome the problem of oscillations around the MPP in the steady state. These methods perform...
The uncertain and time-variant nature of renewable energy results in the need to deal with peaks in the production of energy. One approach is to achieve a load shift and thereby help balancing the grid by using thermally Activated Building Systems (TABS). Control systems currently in place do not exploit the full potential of TABS. This paper reviews how Model Predictive Control can possibly reduce...
This paper focuses on voltage fluctuation and the mismatch between generation and load demand caused by photovoltaic access to distribution network, using energy storage to solve negative effects brought by photovoltaic. According to the characteristics of point of common coupling (PCC) photovoltaic and energy storage accessed to, extended QV bus-type is put forward in order to describe the feature...
This paper analyzes the impact of integration of solar PV and wind power generation on small signal stability of the power system. Standard benchmark IEEE 09 bus system is used for study. The impact has been analyzed by replacing the conventional synchronous generator with solar photo-voltaic generation (SPVG) and doubly fed induction generator (DFIG) wind turbines separately. The effect of varying...
The economic benefits of load shifting are investigated in this paper. For building owners, the economic benefits are assessed from the perspective of lower connection charges, lower monthly power charge, lower capital cost, and reduced system losses. The non-financial benefit of improved power quality and reliability is also considered. For the grid operator, it is assessed from the perspective of...
AC modules or micro-inverters (MIC) have increasing importance in photovoltaic (PV) systems. This paper examines two issues with the flyback micro-inverter having a current-unfolding module or pseudo-dc link (FMICpseudo-dc). In one part, a theoretical analysis is proposed to explain the distortion of the grid-injected current around the grid voltage zero-crossings. It is argued that some distortion...
With the introduction of the smart grid, Advanced Metering Infrastructure (AMI) has become a main component in the present power system. The effective implementation of AMI depends widely on its communication infrastructure and protocols providing trustworthy two-way communications. In this paper we study two routing protocols philosophies for low power and lossy networks (LLNs) and their application...
The looming energy crisis is becoming the greatest challenge to the world today. As a consequence of this there is an increasing attention for alternative renewable energy resources. In future, renewable energy sources will be integrated with energy storage and it will require a proper converter for integrating with the grid. In order to achieve this, various power electronics topologies have to be...
Electricity production from biogas power plants is an important part of a renewable energy system. The main advantage compared to other renewable energy sources is capability to provide base load to the electricity grid. This is possible since biogas production is quite predictable and can be influenced to some degree by feeding the biogas fermenters accordingly. Nevertheless, there are still some...
Many countries have recently installed Combined Cycle Gas Turbine (CCGT) power plants like in United Arab Emirates (U.A.E), which has an arid subtropical climate with very hot summers and warm winters. Plants installed in such location experience great loss since the gas turbine power output decreases with rising ambient temperature. Additionally, CCGTs are installed with supplementary firing which...
This paper investigates impact of increasing photovoltaic (PV) penetration on distribution feeders. The main focus of this work is on ‘how PV systems penetration can influence operation of the protective devices in the distribution feeder?’. PV systems' impact, in a distribution feeder, for 3Φ fault has been analyzed. It considers fault location and protective devices (PDs) settings (e.g. time of...
According to the theory that wind power prediction error approximatively follows a normal probability distribution, this article introduces a concept of error tolerance rate of wind power prediction, and comes to the relationship between the capacity of energy storage system (ESS) and error tolerance rate. Furtherly, the relationship between the size of the storage capacity and the economic costs,...
The wind turbines and storage batteries are considered one of the main components of distribution systems. The paper describes in details the design and control of one of the bi-directional DC-DC converter topologies. It is bi-directional Dual Active Bridge. A control strategy, using PI controllers, for the storage batteries is developed based on constant wind turbine speed. With normal wind power...
An increasing shift from incandescent lamps to compact fluorescent lamps (CFLs), followed by light emitting diode (LED) lamps is taking place all over the world due to higher energy conservation and cleaner energy aspects of such solutions. Energy efficient lamps use electronic components and provide higher luminous efficacy. However, the power quality of such products that actually determines their...
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