Electromagnetic Oscillation Stabilizer for Large-Scale Power Electronics-Dominated Power Systems in LTP Framework–Part II: Generalized Periodic Stabilization Control and Design

The design of electromagnetic oscillation stabilizers (EOSs) involves two critical steps: 1) selecting the installation location, and 2) designing the structures and parameters. The first step has been thoroughly addressed in the Part I paper within the linear time-periodic (LTP) framework, hence this Part II paper focuses on the second step. Specifically, this paper first introduces a generalized periodic stabilization control (PSC) scheme, which is fundamentally a periodic output feedback control strategy. Unlike existing PSC theories, the proposed scheme imposes less restrictive solution conditions and exhibits reduced computational complexity, thereby enhancing its applicability to large-scale LTP systems. Building on this foundation, the paper develops a new PSC-based EOS, which is fundamentally distinct from virtual impedance (VI)-based EOSs designed within the linear time-invariant (LTI) framework. The proposed PSC-based EOS is then applied to a real-world, large-scale power electronics-dominated power system (PEPS). Both theoretical analysis and electromagnetic transient simulations conducted in RT-LAB validate that, compared to a well-established VI-based EOS, the proposed PSC-based EOS achieves larger stability margins and superior control performance across multiple operating conditions in time-periodic PEPSs comprising numerous diverse devices.