International Journal of Electrical and Electronics Research ISSN 2348-6988 (online) Vol. 8, Issue 3, pp: (37-41), Month: July - September 2020, Available at: www.researchpublish.com
Analysis of Congestion Cost in Modern Power Era of Restructured Power System Scenario 1
Neelam Tomar, 2Anuradha Pathak
1
Research Scholar, Electrical Engineering Dept, NITM, Gwalior India 2
Professors, Electrical Engineering Dept, NITM, Gwalior India 1
neelam.tomar@gmail.com, 2auradha.pathak@gmail.com
Abstract: In competitive electricity market, the power system is unbundled into Gencos, Transcos and Discos. In this environment, the market schedule will driven based on purely economic basis without security concern. The remedial actions for insecure schedule will leads to the market for economic inefficiency. The inability of the transmission system to dispatch market required schedule is known as congestion and the corresponding excessive generation cost with congestion relief action termed as congestion cost. This can be defined in a variety of ways. Each definition reflects the design objectives and cost-recovery policies of the particular market. In this paper, three major generic approaches are reviewed which already using by many electricity markets. The approaches are analyzed on IEEE-30 bus system and Indian utility 62 bus system. Keywords: Congestion cost, Restructured power system, Gencos, Transcos, Discos.
I. INTRODUCTION Congestion is a consequence of network constraints and can result in an overall increase in the cost of power delivery. Presently, there are two pricing methods [1] that are being used in a competitive energy market to account for congestion: the uniform pricing method and the non-uniform pricing method. In the first method, all generators are paid the same price regardless of their individual bids based on the bid of the marginal generating unit that would be dispatched in the absence of congestion[1]. Such a bid is referred to as the market clearing price (MCP). Energy prices would not account for congestion and additional costs due to congestion will be passed on to all loads in proportion to their use (the U.K. pool is an example of this type). The restructuring process in the electric power industry in the US over the last few years has led to several structural and regulatory issues regarding transmission grid operation and planning not fully anticipated at the design stage of the grid. The transmission system has not evolved at the rate needed to sustain increasing demand matched with negligible generation addition evidenced in the deregulated environment. This has caused somewhat unexpected congestion bottlenecks in the system. Moreover, the functional unbundling of generation and transmission operations is aggravated due to the lack of coordination between the generation resources and the transmission system operator[2]. As the transmission provider takes on a greater role of for-profit company in managing the transmission system, while facilitating the developing energy market, it is increasingly important to project and assess the magnitude of the transmission revenue collected from congestion rent (Presently, the ISOs allocate the congestion rent to the transmission right owners and the excess/shortfall is paid to/collected from the transmission owners. In this paper we have to discuss about the congestion cost of IEEE-30 bus and Indian utility 62 bus system. With that we will able to make perfect prediction of congestion in deregulated Indian power market and also manage congestion in transmission system.
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