| 1. |
- Arafat, Yasir, 1985, et al.
(author)
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Field test on multiple Smart Meter switching to study the effect on power quality at customers level
- 2015
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In: 2015 IEEE Eindhoven PowerTech, PowerTech 2015. - : IEEE conference proceedings. - 9781479976935
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Conference paper (peer-reviewed)abstract
- Smart Meters (SMs) are undergoing an increasing deployment all over the world and have been introduced to several regions. The SMs generally have remotely accessible breakers which offer remote switching functionalities to the Distribution System Operators (DSOs). The DSOs have the possibility of using this unique functionality of SMs for various future applications, e.g., switching some loads during peak loads crisis or outage management during natural disasters. Under these conditions, the DSO can disconnect selected customers by using SM switching while continuing power supply to risk customers and emergency service providers. During multiple SM switching, the power quality (PQ) of the connected loads might be affected. This paper presents results on the impact of multiple SM switching at customer level. Data are used from a field test on multiple SM switching from a DSO in Sweden. The number of customers in this test was higher compared to the previous two tests of the work. Moreover, all customers in the selected test area were not switched in this test. Almost half of the customers in the test area were disconnected remotely using SMs while the other half of the customers remained connected with power supply to investigate the impact of SMs switching in a different way. This work observed some transient events during the SMs switching. Voltage quality was stable during the test except some flickering effects beyond the limit.
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| 2. |
- Armendariz, Mikel, et al.
(author)
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Facilitating Distribution Grid Network Simulation Through Automated Common Information Model Data Conversion
- 2015
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In: IEEE PowerTech Conference 2015, Eindhoven (Netherlands), 29 June - 2 July 2015. - : IEEE. - 9781479976935
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Conference paper (peer-reviewed)abstract
- In R&D projects as well as in development work,simulations of grid configurations and control methods are acommon tool for assessing different technical options. At thesame time, these simulations are often limited by difficulties indata exchange, simply due to the fact that systems are notcompatible and data format in operational systems is not alignedwith data in simulation and analysis tools. To this extent a toolhas been developed that allows large scale import of real-worldgrid data using CIM XML to state of the art simulation toolsbased on MATLAB. The tool is used in a large FP7 projectinvolving leading European DSOs.
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| 3. |
- Babazadeh, Davood, et al.
(author)
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Distributed Ancillary Service Support for Independent AC-Areas through HVDC Grid
- 2015
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In: 2015 IEEE EINDHOVEN POWERTECH. - : IEEE conference proceedings. - 9781479976935
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Conference paper (peer-reviewed)abstract
- This work aims to study different ancillary servicessuch as frequency support, rotor angle stability and voltagestability that can be provided to independent AC areas throughMulti-Terminal HVDC grid. An agent-based control scheme hasbeen suggested to support the frequency of the imbalanced ACarea using other intact areas during a disturbance. The frequencysupport is carried out through some agents/controller, wherethe objective of the agents is to reach a common value fora given state, i.e. frequency, using the local and neighbouringinformation. In this scheme, the concept of Adaptive Graph (AG)has been introduced to the consensus problem to deal with thelimitation of original scheme in considering the rated capacityof HVDC converters. In this case, the frequency consensus canbe reached to a new stable value by removing one or severalconverters from the communication graph when reaching ratedactive power capacity. In order to test the proposed scheme,a model of 7-terminal dc-grid and corresponding AC areas isdeveloped in real time simulator OPAL-RT. The results showthat the adaptive graph scheme improves the reliability of thesystem during distributed frequency support.
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| 4. |
- Farrokhseresht, Nakisa, et al.
(author)
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Economic impact of wind integration on Primary Frequency Response
- 2015
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In: 2015 IEEE Eindhoven PowerTech, PowerTech 2015. - : IEEE conference proceedings. - 9781479976935
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Conference paper (peer-reviewed)abstract
- In order to have a reliable and secure power system, frequency stability should be guaranteed. Primary Frequency Response (PFR) is used to arrest the frequency deviation upon a contingency. The significant penetration of wind generation in power grids has negative effect on the PFR, as the contribution of wind machines to the total system inertia is low and classical wind turbines do not have PFR capabilities. This study uses two metrics of frequency control, ROCOF and frequency Nadir to analyze the cost increase for maintaining adequacy in the presence of wind power. The Nordic 32-A test grid, representing the Swedish grid is used as case study on which the method is applied.
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| 5. |
- Fischer, David, et al.
(author)
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Impact of HP, CHP, PV and EVs on households' electric load profiles
- 2015
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In: 2015 IEEE Eindhoven PowerTech, PowerTech 2015. - : IEEE conference proceedings. - 9781479976935
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Conference paper (peer-reviewed)abstract
- Todays change of technical equipment in private households leads to altered domestic electric load profiles. This work investigates the change of residential electric load profiles when introducing PV, Air-Source-Heat-Pumps, CHP units and electric vehicles (EV). A modular modelling approach is presented, which allows for application on a larger scale, e.g. for simulations of distribution grid or gas and district heating network in residential areas. Results of a one year simulation for a representative German household show that load peaks can vary heavily between 4.05 kW (PV being present) and 24.67 kW (EV being present), i.e. depending on the technology present in a household. The net yearly elctricity demand varies from -1 094 kWh (PV being present) to 14 936 kWh (ASHP being present). This information should be considered when discussing gird planing, energy supply and DSM concepts for residential areas.
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| 6. |
- Holzer, Andreas, 1988, et al.
(author)
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Effects of Nuclear Power Phase-out in Germany on the Austrian Power System
- 2015
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In: IEEE PES PowerTech 2015, Eindhoven, The Netherlands, 29 June - 2 July 2015. - 9781479976935 ; , s. Art. no. 7232505-
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Conference paper (peer-reviewed)abstract
- The German government has recently decided to phase out all of Germany’s nuclear power plants by the end of 2022. This will likely have a sizable impact on the power system of the neighbor countries. The present paper investigates the effects of a nuclear power phase-out in Germany on the steady state operation of the Austrian power system. For the study, a multi-period dc optimal power flow model of the integrated German and Austrian power systems (GAPS) has been developed. The real power system data of Austria is used while the data for the German power system is taken from available literature. The model is used in the case study considering a number of future scenarios in the power generation supply system in both countries. The results from the case study show that the nuclear power phase-out in Germany would lead to an increase in electricity exports from Germany to Austria and an increased usage of coal power between 26 % and 39 % in 2022, whereas the total costs for power generation depend stronger on wind power conditions in the future.
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| 7. |
- Leon, G., et al.
(author)
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Aspects of power system modeling, initialization and simulation using the Modelica language
- 2015
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In: 2015 IEEE Eindhoven PowerTech, PowerTech 2015. - : IEEE conference proceedings. - 9781479976935
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Conference paper (peer-reviewed)abstract
- A medium sized power system, with a large number of devices, is fully modeled and simulated in Modelica. For this, new models for electrical components and mathematical blocks were developed in Modelica and the full system topology and parameters were taken from a reference system made in Eurostag. Initialization and time-domain simulations are performed in a Modelica simulation environment and the results obtained for the steady-state and the response to time-events are compared and validated with simulations performed in Eurostag.
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| 8. |
- Li, Wei, et al.
(author)
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A PMU-based state estimator for networks containing FACTS devices
- 2015
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In: 2015 IEEE Eindhoven PowerTech, PowerTech 2015. - : IEEE conference proceedings. - 9781479976935
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Conference paper (peer-reviewed)abstract
- This paper presents a PMU-based state estimation algorithm that considers the presence of flexible AC transmission system (FACTS). The models of FACTS devices, including thyristor- and converter-based devices, are developed and then combined with an AC network model. Considering the characteristics of PMU measurements, the network model for state estimation is separated from the measurements. By applying the nonlinear weighted least squares (WLS) algorithm, a PMU-based state estimator can estimate the states of an AC system and its embedded FACTS devices simultaneously. To validate the algorithm, simulation studies for a 9-bus system are performed.
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| 9. |
- Manoloiu, Alisa, et al.
(author)
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Comparison of PI and PR current controllers applied on two-level VSC-HVDC transmission system
- 2015
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In: IEEE PowerTech 2015. - 9781479976935 ; , s. Article no. 7232648-
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Conference paper (peer-reviewed)abstract
- This paper analyzes differences between αβ and dq reference frames regarding the control of two-level VSC-HVDC current loop and dc-link voltage outer loop. In the first part, voltage feedforward effect is considered with PI and PR controllers. In the second part, the feedforward effect is removed and the PR gains are tuned to keep the dynamic performance. Also, the power feedforward is removed and the outer loop PI controller is tuned in order to maintain the system dynamic performance. The paper is completed with simulation results, which highlight the advantages of using PR controller.
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| 10. |
- Moiseeva, Ekaterina, et al.
(author)
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Strategic bidding by a risk-averse firm with a portfolio of renewable resources
- 2015
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In: 2015 IEEE Eindhoven PowerTech, PowerTech 2015. - : IEEE conference proceedings. - 9781479976935
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Conference paper (peer-reviewed)abstract
- The possibility of market power abuse in the systems with a high amount of flexible power sources (hydro units and energy storage) is believed to be very low. However, in practice strategic owners of these resources may limit the ramping rate whenever the price spikes occur. This is particularly relevant for the power systems with a high penetration of wind power, due to the high levels of uncertainty. In this paper we propose a bilevel game-theoretic model to investigate the effect of this type of strategic bidding. The lower-level is a security-constrained economic dispatch carried out by the system operator. The upper-level is a profit-maximization problem solved by a risk-averse company owning a varied portfolio of energy sources: energy storage, hydro power units, wind generators, as well as traditional generators. We represent the uncertainty affecting the decision making by introducing a set of wind power scenarios and variable competitors' price bids. The resulting mathematical problem with equilibrium constraints (MPEC) is recast as a single-stage mixed-integer linear program (MILP) and solved with CPLEX. In the case study we demonstrate the effect of withholding the ramp-rate on the social welfare.
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