Research On Load Dispatch Problems And The Algorithms In Spot Market

The load dispatch in spot market is one of the kernel problems of electric power market, which relates to the benefits of each participant in the market, and also the key issue to assure safety, reliability of power system, and order operation of the electric power market. Although a lot of achievements have been obtained, there are yet many problems to be solved urgentlyThe bidding model of the spot market is analyzed, the new bidding rule is proposed for a PX-ISO type electric power market, i.e. market clearing price is determined according to system marginal price, and load is dispatched according to the rule of pay-as-bid price. Build purchase electricity model and economic load dispatch model to solve a non-smooth cost function caused by the steam admission valve openings with a ramp rate constraint. In order to solve these problems, a new mutation operator and quasi-simplex technique are proposed. Combine quasi-simpelx technique with genetic algorithm and evolutionary algorithm respectively, develop hybrid genetic algorithm and hybrid evolutionary algorithm, and apply these methods to solve the load dispatch problems.With increase of consciousness for environment protection, public more and more pay attention to the environment pollution problem caused by generation electricity. A load dispatch model with three objective functions considered emission, purchasing cost and coal wastage is built in this paper. This model is multi-objective optimization problem, absolute optimal solutions are not existed in general, to get satisfying solutions, we give the fuzzy weights model and crisp equivalent model to solve multi-objective programming and apply this method to solve the environmental/load dispatch problem proposed in this paper.Because there are uncertainties in cost the function and emission function, we propose a new fuzzy economic load dispatch model and a fuzzy environmental/load dispatch model by using fuzzy mathematics theory. Fuzzy load dispatch is fuzzy nonlinear programming problem. To solve this problem, we does not use maximal satisfying factor method like usual, but develop a new solution method that compare to different points function values by using fuzzy number ranking method to seek for optimal solutions. This method can reserve more useful information and provide much help to the decision maker than the previous method. Fuzzy environmental/load dispatch is fuzzy multi-objective programming problem, in order to get satisfying solutions, a...