Showing papers by "Lauri Kutt published in 2016"

Survey of harmonic emission of electrical vehicle chargers in the European market

Abstract: This paper presents results of comprehensive tests of 18 different on-board electric vehicle battery chargers (EVBCs), representing the majority of currently available passenger-car-type EVs in the European market. The presented analysis compares the harmonic characteristics of EVBCs, concentrating on the impact of variations in supply voltage magnitude on emission of low frequency harmonics, as well as their total harmonic distortion and total harmonic current indices. The results provide information on the harmonic performance of EVBCs, classification of their harmonic characteristics and their potential impact on harmonic power flows in residential networks.

Simulation of real time electricity price based Energy Management System

Abstract: The aim of the case study was to determine profitability of Energy Management System (EMS) in the intraday market like Elbas (Nord Pool Spot). To optimize the operation of EMS, a Demand Response (DR) algorithm was used for the calculation of a battery bank charge-discharge schedule (BCDS) taking into account the volatility in the Real-Time price (RTP). The profits are gained from importing and storing more energy at low price periods while decreasing the imported power from the grid at high price periods and dispatching the stored energy for load demands. The forecast procedure analyzes the history of the energy price for a predefined back-time period and optimizes the BCDS to bring the highest profit to the end customer. The results are composed from typical parameters of a household's energy demand applied in EMS. The results obtained were compared with those from laboratory obtained by the Day-Ahead price based control algorithm. In the tests, an one-hour price is taken as real-time price.