Research On Optimization Of Coupling Pair Power Flow Based On Interior Point Method

The northeast regional electricity market has already begun to make an experiment in China. It attempts to open the annually and monthly contracts first, the day-ahead, real-time, ancillary service, generation right and so on will be open for future time, along with the maturation of market step by step. Thus, the day-ahead transaction doesn't implement now. The optimization of daily dispatch scheduling not only deals with the universal problems, but also has its particularity. To this problem, this paper has made a thorough research.Firstly, the model of daily dispatch scheduling before day-ahead transaction being opened is built. In this stage, only has annually and monthly biddings, the day-head market has been not opened, so the objective function is the minimum of network loss. This model has considered the principle of"impartiality, fairness, publicity", under the electricity market environment. In constraint conditions, we add the daily scheming electricity, and the equivalency of load rate of each bidding power plant.The proposal of the coupling pair power flow makes the optimization problem simpler. The searching for the optimization results is in the coupling pairs, it can avoid"large-scale tragedy"that occurred from global optimization. This paper proposed a method that combines time coupling pair decoupling method with primal-dual interior point algorithm, forming a mixed optimization strategy to deal with the optimization of daily dispatch scheduling for present stage. The peculiar problems are dealt by the time coupling pair decoupling method, which can show the clear conception. And the universal problems are dealt by the primal-dual interior point algorithm, which can take advantage of primal-dual interior point algorithm in dealing with the constraint of inequality. As a result, advantage of mutual supplement of both methods can be achieved, and it can properly deal with the particularity and universality of this daily dispatch scheduling. This optimization method appropriately adapts to the character and requirement of this model.Finally, this method presented in the thesis has been tested by using calculating to typical example and the factual power system of LiaoNing grid. They show that, this method can not only dispose the particularity of daily dispatch scheduling in primary electricity market, but also obtain the benefit of the reduction of network loss. The result shows that this method has its practicability and availability.