In order to reduce the impact of the connected-grid current and connected with the grid safely,the operat ing characteristics and vector model of variable speed constant frequency doubly-fed wind power generator are ana lyzed and an idle load grid-connection control strategy is proposed based on grid voltage orientation. The model of doubly-fed induction generator before the connection with the grid is founded and one kind of new model software 1-ock appearance ring (SPLL) is used to track the electrified wire netting voltage phase rapidly accurately is adopted. The experiment platform is built to carry out the connected-grid process.The results show that the proposed control strate-gy is an ideal connected way which can effectively control the stator voltage as the same as electrical network and realize grid connection without overshoot current at different speed.%为避免发电机在并网时发生的电流冲击,并使其安全平稳地接入电网,在分析双馈变速恒频风力发电机组工作原理及其数学模型的基础上,将矢量变换控制技术应用到双馈发电机并网控制中,提出了一种基于电网电压定向的空载并网控制策略,采用了一种新型软件锁相环(SPLL)以实现对电网基波电压正序相位的快速跟踪.搭建了3 kW风力发电实验平台,通过实验证明了该控制策略能有效控制电机定子电压与电网电压在相位、幅值、频率上一致,实现无冲击软并网,是一种较为理想的并网方式.
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