不对称故障下直驱永磁风电机组运行控制方式综述

Review on Operation Control Mode for Direct Drive Permanent Magnet Wind Turbine Under Asymmetrical Fault

首先根据电网不对称故障特征,总结分析了直驱永磁同步风力发电机组在电网不对称故障下运行面临的问题及产生的原因。在此基础上,就抑制背靠背双PWM变流器直流母线电压波动、升高、保持并网电流平衡3方面总结归纳了针对解决不对称故障时风电机组运行问题的主要措施,为进一步保证直驱风机在不对称故障时的安全运行能力,在现有措施的基础上提出了一些设想。

In this paper, the problem and the cause of direct drive permanent magnet synchronous wind generating unit under asymmetrical fault of power grid is summarized and analyzed firstly in accordance with asymmetrical fault feature of power grid. On the basis of that, the main measures in solving the operation problem of the wing generating unit under asymmetrical fault is summarized from such three aspects as restraining fluctuation and rise of DC busbar voltage of back-to-back double PWM converter and maintaining balance of the networking current, and some ideas on assuring safe operation of the direct drive wind unit are proposed on the existing basis.