目前，功角稳定控制一般还是基于系统固定参考系。系统因大扰动而变化时，选定参考点的参考量一般会发生变化。分析发现，基于该坐标系的发电机动态模型存在一些缺陷：实际控制难以实现；参考电压矢量的变化使发电机功角和转子角不等；单机无穷大模型不适用于有当地或中间负荷的情况；多机系统模型因网络和负荷化简而产生失真，并且会使分散解耦控制难以实现。为适应实际分散控制的要求，研究建立了单机二系坐标的发电机动态模型，考虑功角与转子角的不等关系，并提出基于该模型的功角稳定裕度变化的判断方法。该模型适用于参考量变化的情况，物理概念明确，保留功角作为稳定判据的特性，能方便地适用于现实的功角稳定控制。

Power angle stability control is still based on the fixed reference frame at present. The reference status values of the reference point will change when the system varies because of large disturbances. Analysis shows the generator dynamic model based on this frame has some defects: the practical control is difficult to achieve; the power angle is unequal to the rotor angle because of the change of the reference voltage vector; the single-machine infinite-bus model is not suitable for local and middle loads; the multi-machine model is easy to distort because of the network and load simplification, and the distributed decoupling control is difficult to implement. To adapt to the demand of the actual distributed control, a single-machine dynamic model with two coordinates is built, considering the unequal relationship between the power angle and the rotor angle, and a judgment method of the power angle stability margin change based on this model is proposed. The model adapts to the reference change, and has the characteristics of a clear physical concept, reservation of the characteristic of the power angle as the stability criterion, and adaptation to the practical control in power angle stability.

湖南省教育厅资助科研项目(04C092)。