Economic redispatch considering transmission congestion for optimal energy price in a deregulated power system

In a deregulated power system, energy prices throughout the network will be characterised and depending on the existence of transmission constraints. As power flow violates transmission constraints, redispatching generating units is required and this will cause the price at every node to vary. This manuscript introduces a scheme for economic redispatch model based on DC optimal power flow taking into account the transmission issue in order to obtain an optimal energy price, especially when transmission congestion takes place. A proposed scheme is discussed in this paper, to concisely evaluate the foremost indication in calculating the energy price, which is characterised by locational marginal price. The techniques used to incorporate transmission congestion into the model are examined as well.