基于阻抗匹配的小型风电系统功率输出优化方法

为解决现有小型风力发电系统风能利用率偏低的问题,提出一种新型的基于阻抗匹配的系统功率输出优化方法。通过建立和分析小型风力发电系统数学模型,指出在发电机与整流器间串联阻抗后风电系统稳定运行点会发生变化,若阻抗参数设置合理则可提高系统的功率输出;基于该原理,采用粒子群优化算法,结合风速以及蓄电池电压的概率分布情况,以发电机一段时间内输出能量最大为优化目标,确定阻抗参数。仿真结果表明,选择合适的电抗器参数可以有效提高风力发电机能量输出,优化后平均输出功率增加了约21％。

An output power optimization method based on impedance matching for a small wind generation system

In order to solve the problem that the wind energy utilization was very low in most of small wind power generation systems, a novel method based on impedance matching for optimizing output power was proposed. The mathematic model of small wind power generation system was built and analyzed, and it was pointed out that the stable operation point of the wind power generation system would be changed by adding series impedance between the generator and rectifier. The output power would be increased if the parameter of impedance is set reasonably. Base on this principle, the parameter of impedance was confirmed by using the particle swarm optimization algorithm. And the output in a period of time considering the probability distribution of wind speed and battery voltage was used as an optimization object functions. The simulation results showed that the output power of wind generator was effectively improved if the parameter of impedance was correctly selected, and the average output power was increased by 21％.