双馈式变速恒频风力发电机的无电压传感器控制策略

CONTROL STRATEGY FOR DOUBLY FED VSCF WIND POWER GENERATOR WITHOUT VOLTAGE SENSORS

利用电网虚拟磁链的概念,设计了具有初始磁链估计、不需电压传感器的电网电压及虚拟磁链观测器。根据电网虚拟磁链、电网电压和发电机定子磁链的内在联系,建立了电网虚拟磁链统一定向模式下的机侧变换器及网侧变换器的无电压传感器矢量控制策略。最后通过实验研究证明了该方法和策略的正确性和有效性。

Stator flux linkage orientation and grid voltage orientation are usually used in the control of doubly-fed wind power generator, in which the voltage needs to be measured. The use of voltage sensors not only improves the cost and complexity, but also degrades the reliability of the units. Utilizing the concept of grid virtual flux linkage, a grid voltage ＆ grid virtual flux linkage observer without voltage sensors was designed is this paper, which had the ability of original flux estimation. Based on the observer, the vector control strategies of rotor-side converter （RSC） and grid-side converter （GSC） were put forward with the unified grid virtual flux linkage orientation. At last, experimental research was carried on, which verified the correctness and validity of the proposed method and strategy.