Oscillation Analysis and Wide-Area Damping Control of DFIGs for Renewable Energy Power Systems Using Line Modal Potential Energy

In this paper, a line modal potential energy (LMPE) method is proposed for the interarea oscillation analysis and damping control of doubly fed induction generators (DFIGs). This paper presents a novel attempt to design the damping control loop using the LMPE approach from the network viewpoint. First, an LMPE function containing a DFIG output line is constructed. The distribution characteristics of the LMPE in a network are analyzed in different modes, and the dominant mode of the system is identified. In addition, this approach provides the basis for damping regulation. Second, the wide-area control signals and control locations are selected. Third, a damping controller for DFIGs based on LMPE and extended state observer-H
_∞
control is designed, and this design is shown to have a certain anti-interference ability. The proposed method can be used for submode analysis and oscillation suppression. Finally, the correctness of the LMPE method is verified through the analysis and simulation of a four-generator, two-area system and an actual power system in China.