35 results about "Bacteria foraging" patented technology

An improved transformer oil-paper insulation medium response equivalent circuit parameter identification method comprises the steps that a return voltage method is adopted to measure return voltage peak, peak time and return voltage initial slope of a transformer oil-paper insulation system in a field; an extension Debye model is adopted to simulate an equivalent circuit of the transformer oil-paper insulation system; characteristic quantities of the return voltage peak, peak time and return voltage initial slope are established to solve improved mathematical models of a medium response equivalent circuit parameters, wherein the equivalent models of n relaxed branch circuits have 2n+2 model parameters to be solved, and accordingly a corresponding number of nonlinear equation systems are needed to be established through multiple return voltage testing cycles for solution; the solution of the nonlinear equation systems is converted into solution of the optimization problem of an objective function minimum value, a PSO mixed bacteria foraging optimization algorithm is adopted to identify the equivalent circuit parameters and calculate a return voltage curve, the return voltage curve is compared with a return voltage measurement curve to find that the main time constants of the two curves are identical, and the oil-paper insulation state of a transformer can be accurately judged.

The invention discloses a reactive power optimization method of an electrical power system. The bacterial foraging algorithm and the particle swarm optimization algorithm are combined to be applied to the reactive power optimization of the electrical power system. The reactive power optimization method of the electrical power system comprises the following steps: adopting a Newton-Raphson load flow calculation procedure to provide values of each state variable and a network loss value for optimal calculation; setting a reactive power optimization model; initializing a bacterial colony; invoking load flow iterative program appraisal to record an adaptation degree and an optimal value of bacteria; carrying out chemotaxis operation; remaining a good population and breeding the population; carrying out migration operation, and the bacteria die or are born again in a certain probability; and updating the bacterial colony, and outputting a reactive power optimization result after the rated number of iterations is reached. The reactive power optimization method of the electrical power system introduces the colony in an optimal solution, avoids blind and random problems, can exceed a locally optimal solution, combines an existing bacteria foraging optimization algorithm with the particle swarm optimization algorithm, lowers transmission losses by controlling an engine, reactive power output of reactive compensation equipment and tapping points of an adjustable transformer, has the advantages of being rapid in convergence, efficient and stable, and is suitable for resolving the problem of reactive power optimization in the electrical power system.