Ricerc@Sapienza

An optimized system management of a power system must take care of the actual operational and energetic duty of the power system distribution, promoting a high efficiency of power cables and avoiding their excessive gap on load and gap on lifetime. A procedure based on the Arrhenius model of the Thermal Aging of Insulating Materials allows implementing a tool to calculate the life loss and the residual useful life for insulated power cables. The paper deals with simplified models to evaluate the power cable temperature behavior considering the load current variable in the time.

Abstract:

The standards related to energy management emphasize the role of the measurement activity but no exhaustive guidelines have been published for outlining requirements and architecture of a comprehensive energy efficiency monitoring system that goes beyond a simple measuring system. A Monitoring System for Energy Efficiency should transform several kinds of energetic and context data into actionable pieces of information for controlling energy performance, improving operations and maintenance as well as verifying the effectiveness and the continuity of corrective actions.

Total transfer capability analysis of power system is currently a critical issue in both planning & operating of systems. These issues mainly occur due to increase in area and interchanges among utilities. To reduce the flows in heavily loaded lines, Flexible Alternating Current Transmission System (FACTS) devices is used, this results in increased transfer capability, improve stability of the network, low system losses, and fulfill contractual required by controlling the power flows in the network.

Energy Efficiency is one of the cornerstones of European and International energy policy. Technical standardization can contribute to promote energy efficient technologies and solutions and ultimately to reach the targets of energy efficiency improvement and CO2 reduction. This paper provides an overview of the main existing technical standards in the domain of energy efficiency measurement and monitoring.

Many applications Internet-of-things (loT) based exploit Distributed Measurement System (DMS) to acquire data from sensors equipping objects or measurement instruments constituting the DMS nodes. The heterogeneity of the smart objects used to develop IoT applications has become a challenge in the design of the DMS, and very strong is the need to move towards new paradigm for programming and managing such systems. In fact, a current major limitation in the DMS development is the requirement of a deep knowledge about the different programming language and communication protocols.

Net metering is used to incentivize the distributed generation owners. It is introduced in Pakistan with the aim to promote the building integrated local generation. Presently, it is hard to find any study on the economic incentive indicators of the net metering policy for residential customers in Pakistan. This paper presents the economic evaluation of net metering benefits to the individual residential consumers in the presence of Building Integrated PV (BIPV) system under current net metering regulations in Pakistan.

This paper presents an output power smoothing method by a coordinate control of machine side converter and grid side converter for permanent magnet synchronous generator (PMSG) based wind energy conversion system (WECS). The WECS adopts medium voltage source converter with AC-DC-AC configuration. The output power fluctuations are compensated using direct torque control based maximum power point controller and voltage oriented control. The DC link voltage is controlled using grid side controller and the maximum power is extracted using the machine side controller of the wind turbine.

Power stability based on energy storage systems to share the load between distributed generations (DG) in island mode is the main issue in the microgrids (MGs). Stability is an important component in energy management and planning of MG. At the first part of this article, definitions and stability issues classification are presented. In this article, power control based on active power method is analyzed. MG system control due to stability improvement in islanding mode (autonomous mode) after fault occurrence at the upstream network are been studying.

In the modern power system, characterization of customer's demand plays a vital role for Demand Side Management. Demand flexibility information, extracted from the aggregate demand behaviour of customers, presents more comprehensive picture for the aggregator or system operator. There is an existence of diverse flexible time slots during a day in different time periods. Due to the diverse energy consumption behaviour of the residential customers, extraction of flexibility and its associated potential time durations is a challenging task.