Papers by Muhamad Abdu reza
International Energy Journal, 2010
This paper proposes a stochastic approach to investigate the impact of increasing distributed gen... more This paper proposes a stochastic approach to investigate the impact of increasing distributed generation (DG) penetration levels on power system transient stability. The DG units are considered to be synchronous machines that are connected to the distribution networks. The DG units are customer-owned and can be connected or disconnected from the system by their owners at random, so that the DG units generate power in a stochastic way. The random behavior of the load is taken into account as well and the probability distribution of the aggregated generated power and the load demand of the distribution system are calculated using Monte Carlo Simulation (MCS). The DG penetration level is raised by increasing the number of DG units within the test system in steps, while the load is kept constant. The remaining power production is distributed among the centralized generators, inversely proportional to their fuel efficiency. The most inefficient units are shut down when the power output f...
Jurnal Teknik Elektro Universitas Kristen Petra, 2006
This paper shows an example of a stochastic approach to study the impact of distributed generatio... more This paper shows an example of a stochastic approach to study the impact of distributed generation (DG) on the network constraints (congestions) in power systems. We assume the DG units to be customer-owned, so that they can be connected to or disconnected from the power system by their owners at random. Therefore, the DG units generate power in a stochastic way. The load in the system shows a random behavior too, and the probability distribution of the aggregated generated power and load demand of the distribution system are calculated using Monte Carlo Simulation (MCS).The network constraints (congestions) are evaluated based on the probability distributions of the power flows that result from the simulations. The method that is applied in this paper, shows that looking at the network constraints with a stochastic approach gives a more complete picture of the network than applying a deterministic method, especially when non-dispatchable DG units play a dominant role.
Journal of Physics: Conference Series, 2019
The issuance of ESDM (ministry of energy and mineral resources) regulation number 49 of 2018 conc... more The issuance of ESDM (ministry of energy and mineral resources) regulation number 49 of 2018 concerning the use of a rooftop solar power generation system by consumers of PT PLN (Persero). It is encouraging to conduct research on one method of generating electricity using solar panels. The voltage generated in the generation process using solar panels is a direct voltage (DC) and requires an inverter as a voltage converter to be an alternating voltage (AC) which is the daily consumption of Indonesian people. This research aims to develop the use of renewable energy using an inverter. This inverter uses batteries as a source of voltage, Arduino as a source of SPWM waves, and MOSFETs are arranged in a full-bridge configuration to convert 12V DC electricity into 12VAC which will then be filtered using a low-pass filter to pass a 50 Hz frequency and then increase the voltage using a transformer to 220Vmax / 155 Vrms .The result of designing this research is that the inverter is able to produce a sinusoidal wave output 220 Vmax with a frequency of 50 Hz. With the output signal approaching the sinusoidal signal purely from the filter output, the power loss from the use of the transformer causes the power output from the inverter to be not optimal.
3rd IEE International Conference on Reliability of Transmission and Distribution Networks (RTDN 2005), 2005
This paper proposes a new method to investigate the impact of distributed generation (DG) on the ... more This paper proposes a new method to investigate the impact of distributed generation (DG) on the network constraints (congestions) in a horizontally-operated power system; the DG units are customer-owned and connected to the distribution networks. As customer-owned generators can be either connected to or disconnected from the power system by their owners at random, the DG units generate power in a stochastic way. The random behavior of the load is taken into account as well and the probability distribution of the aggregated generated power and the load demand of the distribution system are calculated using Monte Carlo simulation (MCS). The network constraints (congestions) are evaluated based on the probability distribution of the load flow that results from the simulations. The proposed method shows that looking at the network constraints with a stochastic approach gives a more complete picture of the network than applying a deterministic method, especially when non-dispatchable DG units play a dominant role.
Four constitutive equations have been used to describe the behaviour of viscoelastic fluids viz.,... more Four constitutive equations have been used to describe the behaviour of viscoelastic fluids viz., (i) upper convectedMaxwell, (ii) Oldroyd 4-constant, (iii) Bogue-White and (iv) Bird-Carreau . These were modified to improve their ability to predict the observed behaviour of viscoelastic fluids in viscometric and oscillatory shear flows. The fluids used during the experimental work are four different concentrations ofpolyacrylamide (SeparanAP 30) solutions, i.e. 0.6, 0.8, 1.0, and 1.2%, in glycerine I water mixtures. The experimental data are obtained under simple shear and small-amplitude oscillatory shear flow conditions. The viscosity data, obtained fromsteady shear experiments, and the dynamic viscosity and storage modulus obtained from oscillatory shear experiments have been used to determine the model parameters . The performance of the original and modified models have been studied by comparing their predictions of the viscosities, in steady, and the dynamic viscosities, in os...
2005 International Conference on Future Power Systems, 2005
Abstract-This paper investigates the impact of synchronous Distributed Generation (DG) in MV netw... more Abstract-This paper investigates the impact of synchronous Distributed Generation (DG) in MV network on coordination between overcurrent protection in MV feeder and voltage dip sensed by customer at LV side. DG is expected to support keeping the remaining voltage of a ...
IET Conference Publications, 2009
With the background of experience from field investigations in cable networks, multiple pre-strik... more With the background of experience from field investigations in cable networks, multiple pre-strikes and re-ignitions are known to occur during switching operations, causing high frequency, steep fronted transient voltages and currents. Offshore collection grids consist of vast amount of cables, with different length and connection points, which have low surge impedance compared with overhead lines. Consequently multiple pre-strikes and re-ignitions of switching apparatus with cables can cause transient overvoltages with higher time-derivatives than with overhead lines. The validation test circuits specified in the IEC standards developed for impulses due to fulmination on overhead lines do not consider the conditions of large cable grid and repetitive overvoltages due to switching. With the increase of cable grids and particularly wind parks, it has become important to characterize a collection grid cable system and the related transients during manoeuvres with different switching apparatus. The main contribution of this work is the experimental verification of the transient overvoltage phenomena in cable systems. An attempt is made to characterize this phenomenon in terms of number of re-ignitions, the magnitude and the rate of voltage step.
IEEE Power Engineering Society General Meeting, 2004.
DOI to the publisher's website. • The final author version and the galley proof are versions of t... more DOI to the publisher's website. • The final author version and the galley proof are versions of the publication after peer review. • The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal. If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User Agreement:
2005 IEEE Russia Power Tech, 2005
AbstractA methodology for the modelling and analysis of horizontally-operated power systems, ie ... more AbstractA methodology for the modelling and analysis of horizontally-operated power systems, ie systems with a high penetration of stochastic renewable generation, is presented. The objective is to obtain insight in the steady-state of the transmission system ...
Proceedings of the 2011 International Conference on Electrical Engineering and Informatics, 2011
... ABB Sweden 1{muhamad.reza, leif.andreasson, gunnar.persson, anders.x.bostrom}@se.abb. com ...... more ... ABB Sweden 1{muhamad.reza, leif.andreasson, gunnar.persson, anders.x.bostrom}@se.abb. com ... [4] G. Asplund, K. Eriksson, K. Svensson, DC transmission based on Voltage Source Converters, In Proceedings Cigré, Colloquium in South Africa 1997. ...
2008 First International Conference on Infrastructure Systems and Services: Building Networks for a Brighter Future (INFRA), 2008
This paper presents a method to compare and evaluate alternatives for bulk energy transport to me... more This paper presents a method to compare and evaluate alternatives for bulk energy transport to meet evolving needs for electric energy consumption. In particular, it offers insight into the cost and environmental tradeoffs between mine mouth generation with electric transmission technologies and transporting primary energy resources with generation near the customer. A straightforward bulk energy transport model is constructed to
IEEE PES T&D 2010, 2010
Wind power plants use power transformers to step plant output from the medium voltage of the coll... more Wind power plants use power transformers to step plant output from the medium voltage of the collector system to the HV or EHV transmission system voltage. This paper discusses the application of these transformers with regard to the selection of winding configuration, MVA rating, impedance, loss evaluation, on-load tapchanger requirements, and redundancy.
IEEE PES T&D 2010, 2010
This paper presents a summary of the most important protection and coordination considerations fo... more This paper presents a summary of the most important protection and coordination considerations for wind power plants. Short-circuit characteristics of both aggregate wind plant and individual wind turbine genera- tors, as well as general interconnection protection requirements are discussed. Many factors such as security, reliability, and safety are considered for proper conservative protection of the wind power plant and individual
La châine d'extraction-conversion en electricite des energies primaires issues des mines et d... more La châine d'extraction-conversion en electricite des energies primaires issues des mines et des gisements est longue et complexe. Le transport constitue un de ses maillons essentiels. Pour optimiser cette chaine, est-il preferable de construire les centrales electriques a proximite des centres de consommation et de les approvisionner en combustibles par voie mecanique (rail, bateau ou pipeline), ou de les placer au plus pres des gisements d'energie primaire puis d'acheminer massivement cette electricite par câble?.
International Energy Agency's projections indicate that coal and natural gas will be the world's ... more International Energy Agency's projections indicate that coal and natural gas will be the world's fastest growing electric energy sources accounting for around 38% and 30% of the increase in world electric energy generation over the next 30 years. Since primary energy resources deposits are usually distant from load/population centers, a transfer of bulk quantities of primary resources or electric energy is required to meet the growing demand and becomes an important concern from an energy, economic, and environmental standpoint. We define a bulk energy transport (BET) as a transfer of a large quantity of primary energy resources or electric energy (>500 MW) over a long distance (>100 km). The way primary energy resources are moved to power plants and then to load centers is determined by a complex decision making process and depends upon the amount of energy to be moved, haul distance, capital and operating costs of the transport system, a presence of existing infrastructure, etc. Additional factors affecting a selection are linked to externality cost which is related to the environmental and social consequences of energy transport. In this paper we consider air pollution emissions, safety hazard, noise, visual (aesthetic), and EMF impact as major "building blocks" of the externality cost. The outline of the paper is as follows: after the introduction the second section gives a brief overview of the bulk energy transport model; a number of bulk energy transport scenarios are compared in section three; section four discusses the results of sensitivity analysis, and section five concludes the paper.
Proceedings of the World Renewable Energy Congress – Sweden, 8–13 May, 2011, Linköping, Sweden, 2011
Undisturbed ground temperature is one of the most crucial thermogeological parameters needed for ... more Undisturbed ground temperature is one of the most crucial thermogeological parameters needed for shallow geothermal resources assessment. Energy considered to be geothermal is energy stored in the ground at depths where solar radiation has no effect. At depth where undisturbed ground temperature occurs there is no influence of seasonal variations in air temperature from surface. Exact temperature value, and depth where it occurs, is functionally dependent on surface climate parameters and thermogeologic properties of ground. After abovementioned depth, increase of ground temperature is solely dependent on geothermal gradient. Accurately determined values of undisturbed ground temperature, and depth of occurrence, are beneficial for proper sizing of borehole heat exchangers and ground source heat pump system as a whole. On practical example of building being heated and cooled with shallow geothermal resource, via heat pump system, influence of undisturbed ground temperature and geothermal gradient on size of borehole heat exchanger is going to be presented. Sizing of borehole heat exchanger was calculated with commercial software Ground Loop Designer (GLD), which uses modified line source and cylinder source solutions of heat conduction in solids.
Jurnal Teknik Elektro, 2007
In the classical (vertical) power systems the synchronous operation of every interconnected synch... more In the classical (vertical) power systems the synchronous operation of every interconnected synchronous machine (with its inherently rotating masses-inertia) is the main requirement for stable operation. As many of the distributed generation technologies are connected to the distribution network via power electronic interfaces, and do not contain inertia, the power system may show different transient stability phenomena. In this paper, the transient stability of power systems with (inertia less) converter connected distributed generation is explored via the Equal Area Criterion method and compared with that of a traditional (vertical) power system. With the existence of a strong external system, it is f ound that a system with a higher level of penetration of DG exhibits better stability, as measured by improved critical clearing times of the remaining synchronous generator(s).
International Journal of Electrical Power & Energy Systems, 2015
In HVDC-connected wind farms with full converter generator (FCG) the short-circuit currents are m... more In HVDC-connected wind farms with full converter generator (FCG) the short-circuit currents are mainly governed by the control systems of HVDC and wind generators' converters. This peculiarity requires accurate studies for the design and evaluation of reliable fault detection methods. In line with this need three-phase faults analyses have been performed on a test-case system, using PSCAD/EMTDC, and protection strategies have been proposed and analyzed.
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Papers by Muhamad Abdu reza