| Transmission congestion often happens in electric market, because system run models become multiform. In electric market, transmission congestion is not only a technical problem which need solve. In some examples, transmission congestion can obviously change some suppliers'competitive status in electric market. Transmission congestion might reduce some suppliers'profit because electric power can not be transmitted. At the same time, some suppliers might monopolize the electric market and win excess profit. The study of congestion influence on bidding strategies in an electricity market is a investigative domain of complicated and difficult.To solve the problem mentioned above, the main work of this thesis is following:1. We construct the suppliers'and consumers'bidding functions using quadratic. This model can be observed the power of the suppliers which have the ability holding the market because of transmission capacity restriction and the potential of the suppliers using the power to get excess profit. Using game theory, we analysis the principle of suppliers using the market power when occur transmission congestion. Through three examples, some significant results are obtained.2. Earlier work has discussed the potential for strategic bidding in deregulated electricity markets. In the Chapter 4, We show that it is also possible for even mid-price suppliers to create congestion problems through gaming in a noncongestive system. Under three auction mechanisms, this can he profitable, at the consumer's expense. Through two examples, some significant results are obtained.In electric market researching congestion influence on bidding strategies in an electricity market helps to the market surveillant organization watching the suppliers using market power. Then the organization can differentiate and analyse the problems of market. This can be help to perfect the electric market rules. So this paper's research result have some help for making electric market rules.
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