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The combination of extensive cable networks and wind turbine converters has been identified as a potential cause of resonances. A modelling approach for a doubly fed induction generator and a full power converter fed generator for harmonic penetration studies is developed and discussed. An example offshore wind farm is then studied in the simulation package IPSA using the detailed wind turbine generator...
Integration of plug in hybrid electric vehicles and electric vehicles (PHEVs and EVs) includes a wide area of topics like grid effects, different charging concepts, charger designs, harmonics from the charger etc. This short paper gives an introduction to ongoing work within this field in Sweden, and shows on research work within the topic at Chalmers University of Technology.
This paper presents a smart metering network for monitoring energy consumption and power quality of building integrated electric vehicle charging network. The smart metering network consists of smart metering devices, a ZigBee communication network, and a central system for power calculation and power quality analysis. The smart metering device captures current and/or voltage waveform and performs...
This paper presents an alternative formulation of the Harmonic Domain using real only variables. It relies on the idea of a tensor matrix. Brief reviews of Harmonic Domain modeling for multiphase networks as well as the basics behind proposed tensor formulation are presented. Two test cases are used for comparison.
This paper aims to give an overview on main PQ development in Europe. It focuses basically on recent legislative, regulatory, standardization, voltage quality monitoring and education initiatives summarizing the latest outcomes.
This paper illustrates the problems associated with using Norton equivalent models to represent single-phase nonlinear loads. The study is conducted with a specially-developed harmonics testing station that uses feedback to drive the load voltage to a desired target waveform. We apply various voltage waveshapes with 5% THDv to several types of single-phase nonlinear loads which allow us to compute...
Harmonics is a growing concern to both electric utilities and their customers. Nonlinear loads in large-scale industries are important causes for the harmonic currents and voltage distortion. In modern steel manufacturing facilities, Arc furnaces and rolling mill loads are the two major nonlinear loads. They generate significant harmonic currents that flow through the plant and utility power system...
Harmonic and interharmonic studies have become a relevant topic as the number of nonlinear elements and electronic devices connected to power systems networks is constantly increasing. This paper presents a methodology for the modeling of single-phase transmission lines interfaced with nonlinear loads. It is intended for transient analysis and special emphasis is put on the harmonic and interharmonic...
A new approach to harmonic state estimation is proposed by firstly classifying the network nodes into four types. Classification of a particular node into one of the four types is based on the availability or otherwise of node voltage and nodal harmonic injection current measurement at the node. Algebraic expressions to determine all the remaining unknown node harmonic voltages and nodal harmonic...
This paper proposes a novel topology for Electrical Vehicles and Plug-in Hybrid Electrical Vehicles with controllable power factor with 3-phase input and unity power factor with single phase input. The proposed on-board topology provides bidirectional power flow to/from the grid, low weight, low volume, and isolation. A control scheme is devised and a complete simulation of power control is performed...
This paper studies the DFT-based algorithm for the phasor measurement application and investigates its performance for off-nominal frequency conditions, harmonics, inter-harmonics, and out-of-band interfering signals. It is mathematically shown that the DFT technique can provide accurate estimation of the phasors in off-nominal frequency conditions when a three-phase balanced system is concerned....
This paper presents the power quality analysis of a Synchronous Static Series Compensator (SSSC) connected to a high-voltage transmission network. The analysis employs a simplified harmonic equivalent model of the network that is described in the paper. To facilitate the calculations, a software toolset was developed to measure the voltage harmonics content introduced by the SSSC at the Point of Common...
Modern household customers use many power electronic based devices for their daily usage. Those devices emit harmonic current pollutions and eventually increase harmonic voltage distortion level in the network. In the future network, the background harmonic pollution in the MV and upstream networks could increase with the integration of more distributed generations. Thus, the harmonic related problem...
This paper describes a new approach to estimate harmonics/interharmonics of power system voltages and currents based on a hybrid artificial neural network (ANN) and extended Kalman filter (EKF) structure. A very low sampling rate is used to implement the proposed ANN-EKF structure with the modest hardware demands. The ANN structure is used for spectral estimation, consumes a very low processing power,...
Summary form only given. Passive filters have been a very effective solution for power system harmonic mitigation. These filters have several topologies that give different frequency response characteristics. The current industry practice is to combine filters of different topologies to achieve a certain harmonic filtering goal. However, there is a lack of information on how to select different filter...
Frequency is an important factor for power system harmonics measurement. Accurate spectral analysis relies much on the correct identification of frequencies of the measured signals. In this paper, several commonly used methods for power system stationary and time-varying harmonics measurement are reviewed and compared according to the aspect of frequency identification. Recommendations for adopting...
Based on the steady state's parameters of the HVDC system, this paper presents an algorithm to calculate the three-pulse harmonic voltage source in the DC side. In the algorithm, various asymmetries in firing angle, commutation reactance and transformer winding as well as the imbalance of ac voltage are considered. According to the state of valves, the waveform of the three-pulse voltage can be divided...
The Distributed Power Flow Controller (DPFC) is a new device within the FACTS family. It is emerged from the UPFC and has relatively low cost and a high reliability. The DPFC consists of two types of converters that are in shunt and series connected to grids. The common dc link between the shunt and the series converters is eliminated. The active power exchange between the shunt and series converters...
This paper presents an overview of assessment techniques recommended by IEEE Std 519-1992 and the EuroNorm 50160-2009. It also examines reporting requirements for harmonic distortion and voltage fluctuations by the Norwegian NVE 1557 and the Colombian CREG 047 regulations. The paper also presents typical values for harmonic distortion and voltage fluctuations from the three electric utility distribution...
The number of installed distributed generation (DG) in residential areas rapidly increases, specifically in the form of photovoltaics (PV), causing some undesired side effects such as voltage rise. Overvoltage can damage critical loads, but is also disadvantageous for the owner because inverters switch off in case of overvoltage, resulting in output loss. Since grid connected inverters essentially...
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