并网双馈发电机电网电压定向励磁控制的研究

在分析并网双馈发电机传统矢量控制策略的基础上，提出了一种基于电网电压定向的励磁控制策略。该控制策略仅需要定子侧电流、电网电压和转子位置角信号，避免了矢量控制系统中对定、转子量测量精度、实时性和一致性的严格要求，使控制系统得到了简化。利用该文提出的控制策略对双馈发电机有功、无功和转速稳态调节特性及机端三相对地突然短路的过渡过程进行了仿真研究，结果表明该控制策略能实现双馈发电机有功、无功和转速的解耦控制及短路故障切除后其有功、无功和转速都能回到原来的设定值稳定运行。

STUDIES ON EXCITATION CONTROL OF POWER SYSTEM VOLTAGE ORIENTED FOR DOUBLY FED GENERATORS CONNECTED TO AN INFINITE BUS

Based on the analyses of the classical vector control of doubly fed generators connected to an infinite bus, a excitation control strategy of the power system voltage oriented is presented in this paper. Using with the control strategy, the stator currents, power system voltage and rotor position signals are only required. It is unnecessary to get the precision and real-time and coherence of measurement between the stator and rotor electric values, so that the practical control system of doubly fed generators can be simplified. The steady state regulation characteristics among the stator active power and reactive power as well as the rotor speed, and the transient characteristics of a suddenly three phase shorted circuit of stator terminals to the grand for doubly fed generators are simulated by using this control strategy. It is shown that active power, reactive power and speed are controlled separately and the doubly fed generator appears good in stability and dynamic performances with this control strategy.