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Published in: Evolutionary Intelligence 1-2/2009

01-11-2009 | Special Issue

Multiagent coevolutionary genetic fuzzy system to develop bidding strategies in electricity markets: computational economics to assess mechanism design

Authors: Igor Walter, Fernando Gomide

Published in: Evolutionary Intelligence | Issue 1-2/2009

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Abstract

This paper suggests a genetic fuzzy system approach to develop bidding strategies for agents in online auction environments. Assessing efficient bidding strategies is a key to evaluate auction models and verify if the underlying mechanism design achieves its intended goals. Due to its relevance in current energy markets worldwide, we use day-ahead electricity auctions as an experimental and application instance of the approach developed in this paper. Successful fuzzy bidding strategies have been developed by genetic fuzzy systems using coevolutionary algorithms. In this paper we address a coevolutionary fuzzy system algorithm and present recent results concerning bidding strategies behavior. Coevolutionary approaches developed by coevolutionary agents interact through their fuzzy bidding strategies in a multiagent environment and allow realistic and transparent representations of agents behavior in auction-based markets. They also improve market representation and evaluation mechanisms. In particular, we study how the coevolutionary fuzzy bidding strategies perform against each other during hourly electric energy auctions. Experimental results show that coevolutionary agents may enhance their profits at the cost of increasing system hourly price paid by demand.

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Appendix
Available only for authorised users
Footnotes
1
The application of game theory in electricity markets is a broad area and its review is out of the scope of this paper.
 
2
A more detailed description of this work can be found in [34].
 
3
This and all previous papers are a result of the PhD thesis of the first author. They have no links with the Regulatory Agency.
 
4
An “active” rule is a rule that is processed during fuzzy inference while an “inactive” rule remains in the rule base genotype but it is not processed during fuzzy inference.
 
5
ONS: Operador Nacional do Sistema.
 
6
The choice of the evolutionary parameters is not subject to any optimization process.
 
7
The training process can take about 2 h of processing time for two species, corresponding to 500 generations, and above 6 h for four species and 1,000 generations. Experiments were done using a Pentium 4,2 GHz 256 Mb RAM PC running GNU/Linux Fedora.
 
8
In [5] two thermal plants coevolved. They are the same used as evolutionary agents in [3]: Argentina I and Argentina II, respectively.
 
9
This behavior of the coevolutionary agents may change if one assumes zero cost for no output, that is, C(0) = 0.
 
10
Notice that for the conservative strategy, Argentina II is the marginal generator during 84 h (25%) over the 2 weeks test period.
 
11
Using the conservative strategy, Argentina I becomes the marginal generator only for 53 h (16%) over the test period.
 
12
Knowledge bases are shown in Appendix C.
 
13
Using the conservative strategy, TermoRio is the marginal generator for 75 h (22%) over the 336 h period only.
 
14
For the conservative strategy Ibirité is the marginal generator for 55 h (16%) of the 336 h test period.
 
15
The result is similar for N < p ≤ N + M − 1.
 
16
The letters A and I indicate respectively an Active or Inactive rule. The 1’s (0’s) represent a linguistic term that is used (is not used) in a given rule, as detailed in Appendix A.
 
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Metadata
Title
Multiagent coevolutionary genetic fuzzy system to develop bidding strategies in electricity markets: computational economics to assess mechanism design
Authors
Igor Walter
Fernando Gomide
Publication date
01-11-2009
Publisher
Springer-Verlag
Published in
Evolutionary Intelligence / Issue 1-2/2009
Print ISSN: 1864-5909
Electronic ISSN: 1864-5917
DOI
https://doi.org/10.1007/s12065-009-0023-2

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