永磁直驱风电机组的容量通常达到了兆瓦级,采用并联型结构是主要的扩容方式。传统的风电变流器机侧整流器具有独立的直流母线,虽具有控制简单的优点,但也存在成本高、体积增加等问题。针对这个问题,提出了一种新型的永磁直驱风电机组机侧多整流器共直流母线并联运行控制策略。该控制策略的控制目的是抑制共直流母线的整流器模块之间由于不同步造成的环流,因此首先对具有公共直流母线的多整流器运行的直流环路和零序电流动态进行了建模和分析,设计了独立的电流控制器,并通过同步载波移相配合生成了多簇脉冲调制信号给不同的整流器模块,但相互的控制器使用了同一个转子位置观测器,从而实现了每个模块的电流同步和均衡,并匹配了最优的总发电机转矩。最后,为了验证控制策略的有效性,基于1.5MW的永磁直驱风电机组试验平台进行了试验研究。试验结果表明,在新型控制策略下,变流器机侧多整流器模块能正常运行,并具有较优的性能。

The capacity of the direct driven permanent magnet wind turbine was usually reached megawatt, and the parallel structure was the main solution for expansion. The generator side of the traditional wind power converter was always has an independent DC bus. Although it had the advantages of a simple controller, but the cost would higher and the volume would increase. Aiming at it, a new control schema of parallel rectifiers for a direct drive permanent magnet wind power generator had been proposed. The purpose of the controller was to suppress circulation current caused by asynchronization between the paralleled rectifiers. Therefore, the loop circulation current between the multiple rectifiers had been analyzed, and the dynamic of zero sequence current had been modeled at first. Then, the independent current controllers havd been designed, and it generated the pulse modulation signal to the rectifiers through the synchronous carrier phase shift generator. Each controller used the same rotor position observer, so as to realize the current of each module synchronization and equalization, and the total generator torque optimal matching. In order to verify the performances of the proposed controller, the platform based on 1.5MW wind power system was built, and some experiments had been done. The results showed that the rectifier modules of the converter operators well with the new controller, and the performances of the controller were good.

TM 461

江苏省扬州市2015重点研发计划项目(YZ2015084)