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CO2 emission, fossil fuels decrease and progressive growing energy needs have created many new difficulties for energy supply in the world. Renewable energy resources (RES) based on Distributed Generation (DG) are innovated in response to pollution lower, efficiency enhancement, cost reduction and reliability improvement in deregulated market over the past two decades. Renewable generations are principally...
Recent progress in advanced energy storage systems (ESS) and their relative technological maturity imply a promising future for energy storage. As a consequence, the use of stored energy to support and optimize the generation, transmission, and distribution subsystems has been grown up worldwide. One of the ESS applications is using them for load leveling. Since network losses is a square function...
Connection of distributed generation units with appropriate allocation and size in network will have different effects such as increasing of reliability in network, decreasing of losses, improving of voltage profile, decreasing of transmission and distribution energy costs and improving of power quality parameters like voltage unbalance. So far, researches about allocation of distributed generation...
In this paper, a novel adaptive optimization method based on Firefly Algorithm (FA) is proposed to handle the optimal capacitor placement problem suitably. The proposed method is based on the social behavior of firefly insects and their shining phenomenon. A sufficient two phase modification technique is proposed to improve the total search ability of the algorithm effectively. The objective function...
A novel method based on s-transform matrix for analyzing power quality is proposed in this paper. It proposes a very fast and robust algorithm to identify and measure PQ disturbances. The capability of this algorithm to recognize and measure disturbances in both time and frequency domains will assist in precise disturbance localization and detection. Many case studies considered here, containing voltage...
Demand response (DR) as a state-of-the-art program is accommodated in the energy efficiency contexts of the smart grid. Lack of the customer knowledge about how to respond to the time-differentiated tariffs and offered controlling signals is the major obstacle in the way of broad DR implementing. As a solution, an optimization method, namely load control (LC), is proposed to automatically control...
In planning and operation of anelectric power distribution system, accurate estimation of the reliability performance of its different components is a fundamental and challenging part. Weibull probability distribution has been used frequently for the reliability performance analysis. Over the years several new distributions have been proposed that are either derived from, or in some way related to,...
Similar to conventional systems, having acceptable voltage and frequency is necessary in a MG. MGs have variable nature due to the existence of the generators like PVs. Because of this, the control issue in MGs is important. The stable performance in MGs is realized by grid in grid-connected mode. But it depends on proper controllers in primary, secondary and emergency levels, in islanded mode. Security...
In the recent years, using distributed generation resources (DG), which are usually based on renewable energies, have noticeably developed on account of benefits for DGs such as reducing environmental pollutions and their interminable sources. Presence of DG influences the performance of distribution network that can be positive or negative.
This paper proposes a novel method for quantifying the protection impacts of distributed generation. A multi objective function has also presented for DG allocation. This function minimizes the protection impacts while maximizing the voltage profile improvement and loss reduction. Genetic algorithm has been implemented for this optimization and the proposed method has been run for a real network,...
This paper proposes the use of the embedded Z-Source (EZ-source) inverters in photovoltaic (PV) grid interconnection. Being different from the traditional Z-source inverter, EZ-source inverters are constructed by inserting dc sources into the X-shaped impedance network so that the dc input current flows smoothly during the whole switching period unlike the traditional Z-source inverter. Fully parallel...
In previous researches, a signal-based model of power network and STATCOM accompanied by its controller is presented. Using such a model, considering shunt filters is so complicated. Implementing filters is the most popular method of harmonic elimination in networks which contain FACTS & power electronic devices. Also, there is a need to simulate the real model of power network and STATCOM switching...
On average a lot of wires used in electrical power distribution network become stolen every day and a very heavy cost spends on replacing new wires to stolen-wires‥ In this project, the stealing of power distribution network's wire will prevent and reduce with using systems-based with a very low cost method and high precision.
System protection performance and transient stability of the electrical network are significantly affected by each other. The larger the time delay in which protection detects and clears the fault, the more likely loss of synchronism will be, especially in the networks with internal generation. Over current protection schemes inherently operates with considerable delay. Moreover, system dynamic oscillations...
This paper studies the optimal planning of a renewable based energy supply plan for a residential building. It has been assumed tha the building involves a platform equipped with smart communication and metering infrastructures, recalling the smart home (SH) concept. The best economically optimal model is choosed in each case based on the net present cost (NPC) and the cost of energy (COE) criteria...
In this paper DC microgrid small signal stability is studied. Droop based decentralized control is assumed for micro grid control. Dynamic model of each component is derived individually and combined to form total state space equations of DC micro grid. Eigen values of system are also extracted. It is shown that under variation of PI controller the location of system poles changes.
In this paper, a scheduling method for optimal charging/discharging of central stationary battery storage units in medium-voltage distribution network is proposed. The storage units are used for both peak cutting and diminishing of the energy not supplied in distribution network. Moreover, the uncertainty impact of plug-in electric vehicles (PEVs) on the optimal scheduling is considered. The uncertainty...
Since energy consumption is increasing in Iran, especially in the construction sector and also the cost of the production, transmission and distribution of energy is increasing, presenting teqniques for the optimization of energy consumption is one of the most important present needs of the country. The main aim of this paper is to offer a documentary evidence for this high potential of energy saving...
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