The Algorithm And Application Of Optimal Operations For Cascaded Hydropower Plants

The optimal schedule and economic operation is typical multi-constrains, non-linear optimization problem, which is involved in economic and environmental issues. And the cascaded hydropower plants short-term optimal operation is one of the most complicated problems in comprehensive explorations for hydropower energy. According to the characteristics of complex hydropower energy system, it is necessary to introduce new method. So the research has been the academic front in this field, and it is of high theoretical meaning and practical project value.In the practical projects, there are many different and mature optimization calculation methods. After the joint optimal schedule problem for drain area was presented, the genetic algorithm, as a new stochastic searching algorithm, has shown exceptional problem-solving ability. However, the conventional genetic algorithm is of slow convergence speed and the possibilities of finding optimal solution is small, which have limited its application in the practical project. Aiming to solve these problems, this article researched, designed and presented an improved genetic algorithm--complicated pseudo parallel genetic algorithm (CPPGA). And the creative work in improving performance of algorithm has been made, which are mainly as follows:1. Absorbing the advantages of general coding pattern for chromosome, the special hex coding pattern was presented. It can improve the performances of this algorithm, and it can preserve the genetic pattern. This will ensure the population to evolve along with the direction of convergence, and it will increase the possibility to find the global optimal solutions.2. The two evolution index, Gengap(k) and, were presented. With these two evolution indexes and computing time, the macro evolution computing situation can be monitored, and it is accessible to impose fine control for the evolution process, in order to control the trend of evolution computing and accelerate the convergence.3. For cascaded hydropower plants short-term optimal operation, the complicated computing system, the parallel computing idea was adopted. Special dual-population was designed to evolve, and this can increase the computing speed.On the base of theoretical research and analysis, this article presented a simulation calculation example with test function to test the feasibility and performance of this model, and the simulation calculation for three gorges was conducted, and its optimization calculation result was given. After comparing analysis, it is clear that the complicated pseudo parallel genetic algorithm is a good method to make the short-term optimal operation scheme for cascaded hydropower plants, and this method should be generally feasible.