提升并联型风电变流器运行效率的自适应功率优化控制

发布时间：2018-12-10 19:24

【摘要】：由于功率器件容量的限制与系统可靠性要求的严苛,风电变流器一般采用变换器并联来提升容量和可靠性,控制上采用功率均分运行模式。风能的随机、波动特性使得变流器的负载功率波动很大,其平均负载功率低于额定功率的50%。变流器的运行效率与负载率相关,功率均分运行模式使并联变流器低载工况下的运行效率低下。该文提出一种提升并联变换器系统运行效率的自适应功率优化控制方法。基于单个变换器的效率曲线,采用穷举优化算法优化不同负载功率时各并联变换器的最优功率分配值。通过离线优化、在线查找方式提高波动功率下并联系统运行方式的优化速度。引入功率滞环控制,优化变换器的投切。该文比较3种运行模式下并联系统的运行效率,结果表明,提出的自适应功率优化控制可有效改善波动载荷下并联系统的运行效率。
[Abstract]:Due to the limitation of power device capacity and the strict requirement of system reliability, wind power converters are generally used in parallel to enhance capacity and reliability. Because of the random and fluctuating characteristics of wind energy, the load power of the converter fluctuates greatly, and the average load power is less than 50 percent of the rated power. The operation efficiency of the converter is related to the load rate, and the operation efficiency of the parallel converter is low under the low load condition. In this paper, an adaptive power optimal control method is proposed to improve the efficiency of parallel converter system. Based on the efficiency curve of a single converter, an exhaustive optimization algorithm is used to optimize the optimal power distribution of parallel converters with different loads. By off-line optimization, on-line lookup improves the optimal speed of parallel system operation under fluctuating power. The power hysteresis control is introduced to optimize the switching of the converter. This paper compares the operating efficiency of three parallel systems under different operating modes. The results show that the proposed adaptive power optimal control can effectively improve the operating efficiency of parallel systems under fluctuating loads.
【作者单位】：上海交通大学电子信息与电气工程学院;
【基金】：国家重点研发计划(2016YFB0900901)~~
【分类号】：TM46

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