G. Michalik

Monash University (Australia), Melbourne, Victoria, Australia

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Publications (14)14.17 Total impact

  • W. Mielczarski, G. Michalik, M. Widjaja
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    ABSTRACT: In electricity markets organized as pools, electrical power producers provide offers (called sometimes bids) of power generation in defined price bands for every trading interval. Usually, the price offered reflects the variable cost of generation. Bidding behavior of market participants is determined by several factors. They include vesting and bilateral contracts, predicted demand, generation reserve, experience from the past and gaming attitudes. This paper analyses a typical bidding behavior of power generators in the Victorian and Australian national markets. Australia has a significant experience in designing of electricity market structures and construction of market simulators
    Power Industry Computer Applications, 1999. PICA '99. Proceedings of the 21st 1999 IEEE International Conference; 08/1999
  • W. Mielczarski, G. Michalik
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    ABSTRACT: Voltage regulation has been employed for years to keep supply voltage within the limits determined by standards. In competitive electricity markets, voltage control can be used to adjust demand to varying prices and increase revenue of a supply company. The paper discusses effect of voltage regulation on electrical equipment and its energy consumption. The field tests carried out in three households, show high voltage levels resulting in large energy consumption. The paper addresses economic and legal aspects of voltage regulation in competitive electricity markets.
    Power Engineering Society 1999 Winter Meeting, IEEE; 01/1999
  • W. Mielczarski, G. Michalik
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    ABSTRACT: This paper presents the introduction of an open electricity market in Victoria, Australia, and the analysis of spot prices from July 1994 till January 1998. A new structure of a competitive market where independent energy suppliers and users create electricity prices in a bidding system is discussed. Electricity trading takes three major forms: vesting contracts, hedge contracts and the spot market. Although less than 10% of electrical energy is purchased in the spot market, spot prices strongly affect contract prices and the behaviour of pool participants. The statistical analysis of spot prices shows a continuing trend towards very low spot prices. However, network limitations and the coincidence of scheduling line maintenance with hot weather leads to extremely high prices. The anatomy of the Black Week in November 1997 is discussed in detail.
    Power Engineering Society 1999 Winter Meeting, IEEE; 01/1999
  • W. Mielczarski, G. Michalik
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    ABSTRACT: The paper describes the regulation of supply quality in the Victorian competitive markets in Australia. Generator, transmission network companies, the market operator, distribution companies and electricity users have to obey the regulations set up by the Office of the Regulator-General (ORG). The requirements relating to quality of supply are defined in the System and the Distribution Code. ORG has several instruments including large penalties to execute the regulations defined by the Codes. This creates a new legal situation. There are several avenues for customers' complaints on quality of supply. The competitive electricity markets are generally more customer-oriented. This balance of powers leads to a better understanding of customer needs and results in higher supply quality
    Harmonics and Quality of Power Proceedings, 1998. Proceedings. 8th International Conference On; 11/1998
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    ABSTRACT: The paper discusses the application of compact fluorescent lamps (CFL) in the domestic sectors. Side effects of CFLs, such as harmonic distortion, lower than expected energy conservation, dependence of efficiency on warm-up time, external temperature and “burning” position are analyzed. Although the findings indicate that the CFLs may bring some benefits both to customers and power supply utilities, when promoting the CFLs, customers should be informed about all these side effects
    Harmonics And Quality of Power, 1998. Proceedings. 8th International Conference on; 11/1998
  • G. Michalik, M.E. Khan, W. Mielczarski
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    ABSTRACT: The paper presents the statistical analysis of demand and spot prices in an open electricity market in Victoria, Australia, for 3 years of the market operation
    Advances in Power System Control, Operation and Management, 1997. APSCOM-97. Fourth International Conference on (Conf. Publ. No. 450); 12/1997
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    ABSTRACT: We present a new concept of modelling energy-using behaviour of residential customers by the use of linguistic variables and a fuzzy logic approach. Trapezoidal- and delta-shaped fuzzy filters were applied to transfer uncertainties of customer declarations expressed in linguistic variables into parameters of structural models. This approach involves individual treatment of each customer. In surveys of energy consumption, precise description of appliance uses is practically impossible. Thus, fuzzy models are appropriate. The method is especially useful for small- and mid-size samples of customers who are connected to the same supply feeder or living in a chosen area.
    Energy 01/1997; · 4.16 Impact Factor
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    ABSTRACT: We present the development of structural models for energy consumption in the residential sector. Customers were segmented into four main categories with six sub-groups within each category. A survey of over 100 customers provided data on the 17 appliances considered, which are grouped into three main categories. The models provide energy-use patterns for each category of customers for selected customer samples or for a chosen area. Energy patterns are simulated in 15-min time intervals. These show total demand and provide information on the structure of energy consumption in simulations for demand-management programs, long-term forecasting and customer identification.
    Energy 01/1997; · 4.16 Impact Factor
  • W. Mielczarski, M. Lech, G. Michalik
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    ABSTRACT: We present a new approach which identifies the number of customers within particular categories living in a chosen area of energy supply. This identification is made from total energy consumption measured at distribution feeders by applying characteristic patterns of energy use and nonlinear programming techniques. Customers were segmented into four main categories with six sub-groups in each category. A total pattern of energy use was obtained by summing for each sub-group the energy consumption which is based on the characteristic patterns of energy use for that sub-group and the number of customers in that sub-group. Simulations were carried out to verify different optimization procedures. Results show that a variable matrix optimization procedure can identify customers most accurately by minimizing the assumed objective function to a negligible value after 100 iterations.
    Energy 01/1997; 22(11):1103-1109. · 4.16 Impact Factor
  • W. Lawrance, W. Mielczarski, G. Michalik
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    ABSTRACT: A novel injection method for reducing the harmonic distortion associated with bridge rectifiers has been developed by the authors. The performance of the new system under varying rectifier operating conditions is examined and a detailed case study of the new scheme applied to a low-voltage distribution network is included in the paper. Results of this case study show that the new scheme is a cost effective method of reducing total harmonic distortion levels throughout distribution systems.
    Electric Power Systems Research 02/1996; 36(2):123-130. · 1.69 Impact Factor
  • G. Michalik, W. Mielczarski
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    ABSTRACT: This paper presents some results from a project aimed at the development of characteristic patterns of energy use based on structural models of energy consumption. The structure of the models developed allows an analysis of demand side management (DSM) impact and future demand. This paper is focused on the application of fuzzy filters in transferring linguistic variables expressed in terms of common words into mathematical operators. These linguistic variables appear when customers describe their behaviour and life styles. The fuzzy filters used not only transfer linguistic variables into computerised forms but they also map uncertainty from linguistic data into filter parameters
    Intelligent Systems Applications to Power Systems, 1996. Proceedings, ISAP '96., International Conference on; 01/1996
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    ABSTRACT: The paper presents two new schemes of harmonic current reduction in distribution circuits. The first scheme aims at the reduction of harmonics generated by six pulse bridge rectifiers which are common nonlinear loads in industry. The new approach is based on injection of the third harmonic current into the transformer secondary. The current injected is generated in two passive filters connected between the outputs of the bridge and the common point of transformer secondary. The scheme is very effective, reducing harmonic distortion in the supply current from 27% to 4-5%. The second scheme presented aims at the reduction of harmonic distortion caused by fluorescent lamp systems. It assumes the installation of a series filter in the neutral conductor. A specially designed filter provides a low impedance path for the first harmonic current and high impedance for higher harmonics. Simulation and laboratory tests show significant reduction of harmonics in the neutral and phase conductors
    Energy Management and Power Delivery, 1995. Proceedings of EMPD '95., 1995 International Conference on; 12/1995
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    ABSTRACT: The paper deals with the problem of cost calculation of reactive power flow. Reduction of distribution losses needs installation of compensating devices to reduce the flow of reactive power and harmonic currents. It leads to the installation of expensive compensating devices the cost of which has to reflect the negative impact of harmonics on distribution networks. The paper considers an application of an adjusted power factor as the most promising solution to the determination of costs of reactive power supply
    Energy Management and Power Delivery, 1995. Proceedings of EMPD '95., 1995 International Conference on; 12/1995
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    ABSTRACT: A scheme is described for reducing the harmonics associated with 3 phase 6-pulse bridge rectifiers using harmonic current injection. The performance of the new scheme is examined with fixed filters and varying load current for both controlled and uncontrolled bridge rectifiers
    Power Electronics and Drive Systems, 1995., Proceedings of 1995 International Conference on; 03/1995