变速恒频双馈风力发电运行综合控制策略

根据交流励磁变速恒频风力发电的运行特点,将矢量控制的电网电压定向技术应用在双馈电机的并网发电上,提出了一种基于电网电压定向的变速恒频双馈风力发电运行综合控制策略,实现了与定子磁链定向矢量控制相同的功能,且省去了定子磁链观测器,简化了算法。建立了变速恒频风力发电柔性并网、稳态运行和电网波动情况下不脱网运行的控制模型,实现了宽范围变速条件下无冲击电流并网、输出功率的解耦控制和最大功率点跟踪。在变速恒频并网发电系统中,发电机与电网之间是一种柔性连接关系,仿真和实验结果证明了控制策略的正确性与有效性。

A synthetic control strategy for DFIG wind power generation

According to the characteristic of AC-excited variable speed constant frequency(VSCF) wind power generation,vector control technique is applied in doubly fed induction generator(DFIG).A synthetic control strategy is presented based on grid voltage orientation,which gets the same performances as stator flux-linkage orientation,and the stator flux observer can be omitted to simplify the control strategy.The modes of flexible grid-connection,running in ready state and fault ride through were established,cutting-in grid without overshoot current was realized in a wide speed range,decoupling control of active power and reactive power was obtained and maximum power point was tracked.In the VSCF wind power generation system,the motor and the grid were connected flexibly.Simulation and experimental results confirm the accuracy and validity of this control strategy.