An accurate measurement procedure of power losses variations in electrical drives

This paper presents a general procedure for the accurate measurement of power losses variations in electrical drives. More specifically, the paper addresses the issue related to the efficiency comparison of electrical drive controlled with different control algorithms. This procedure is applied to a permanent magnet synchronous motor drive, assessing its power losses by means of two different measurement systems, each one characterized by different accuracy and cost. The comparison between these two systems is carried out for different working conditions in terms of load, speed and magnetization in order to demonstrate that the power losses variations can be accurately measured even with not expensive instrumentation

A general and accurate measurement procedure for the detection of power losses variations in permanent magnet synchronous motor drives

The research of innovative solutions to improve the efficiency of electric drives is of considerable interest to challenges related to energy savings and sustainable development. In order to successfully validate the adoption of new and innovative software or hardware solutions in the field of electric drives, accurate measurement procedures for either efficiency or power losses are needed. Moreover, high accuracy and expensive measurement equipment are required to satisfy international standard prescriptions. In this scenario, this paper describes an accurate measurement procedure, which is independent of the accuracy of the adopted instrumentation, for the power losses variations involved in electrical drives, namely DDP, useful to detect the efficiency enhancement (or power losses reduction) due to the real-time modification of the related control algorithm. The goal is to define a valuable measurement procedure capable of comparing the impact of different control algorithms on electric drive performance. This procedure is carried out by experimentally verifying the action of different control algorithms by the use of a Field Oriented Control (FOC) with different values of the direct-axis current component (i.e., Id = 0 A and Id = =-1 A) applied for fixed working conditions in terms of speed and load torque. Two different measurement systems of power losses, each one characterized by different accuracy and cost, are taken into account for the validation of the proposed method. An investigation is, then, carried out, based on the comparison between the measurements acquired by both instrumentations, for different working conditions in terms of load and speed, highlighting that the uncertainty generated by systematic errors does not affect the DDP measurements. The results reported in this work demonstrate how the DDP parameter can be used as a valuable index for the characterization of the power drive system, which can also be evaluated even with low-accuracy instrumentation

Congestion Management in Italian HV grid using novel Dynamic Thermal Rating methods: First results of the H2020 European project Osmose

The Italian demo of the H2020 Osmose project, which stands for Optimal System-Mix Of flexibility Solutions for European electricity, is led by Terna and aims at developing a novel Energy Management System (EMS), which allows managing distributed Renewable Energy Sources (RES) and severe grid congestions. This is obtained by properly coordinating innovative flexibility resources which include Dynamic Thermal Rating (DTR) and Demand Side Response (DSR). The DTR methods proposed under this framework have been developed by Ensiel, a consortium of Italian universities active in power systems research. These solutions include a sensor-based method, based on a self-organizing sensor network composed by cooperative smart nodes deployed along the line route, and a weather-based technique, based on a thermo-mechanical model of the monitored line. The main features of these advanced solutions are described in this paper, and the first experimental results obtained on real case studies are presented and discussed in order to prove their effectiveness

Inertia Requirements Assessment for the Italian Transmission Network in the Future Network Scenario

Renewable Energy Sources (RES) are replacing conventional Synchronous Generators (SGs) in the Italian generation scenario, thus leading to a decrease of the electric system inertia and to possible problems of inertia shortage. This paper provides a method for the estimation of the inertia that will be required to be installed in the Italian Grid in the 2030 year with the aim of limiting the Rate of Change of Frequency (RoCoF) within the desired interval. Four technologies are considered for the provision of additional inertia: Photovoltaic (PV) systems, Wind Turbine (WT) plants, Battery Energy Storage Systems (BESSs) and Synchronous Compensators (SCs). The proposed method provides also the optimal mix among the aforementioned technologies according to a techno-economic indicator. The 2030 scenario has been characterized thanks to the data provided by Terna S.p.A, the Italian Transmission System Operator (TSO)