An inter-area mode oriented pole-shifting method with coordination of control efforts for robust tuning of power oscillation damping controllers

An inter-area mode oriented pole-shifting method (named: IAMO-PS) with coordination of control efforts is proposed in this paper to tune power oscillation damping controllers under multiple operating conditions. Firstly, to provide incentives for developing IAMO-PS, a pole-shifting method (named: SCCS-PS), which tunes the controllers by moving all closed loop poles to a sequentially compressed conic section in the complex plane, is proposed to investigate impact of other modes on the control of inter-area modes. Thus, compared to SCCS-PS, a specific pole placement suitable for damping control of inter-area modes is implemented in IAMO-PS. Moreover, since a novel index is proposed to effectively measure control effort of the controller, IAMO-PS is capable of reasonably allocating the control burden among different controllers, which will be attractive for applications in practice. Optimization of both methods is solved by the efficient method of sequential quadratic programming, and a two-stage optimization procedure is proposed for IAMO-PS so that a feasible solution can be easily obtained in practical applications. Both methods are applied for control coordination in the New England and New York interconnected systems. Simulation results verify the effectiveness of IAMO-PS in robustly mitigating inter-area oscillations and coordinating control efforts, and some beneficial conclusions are also confirmed by comparing control results of the two methods.