Global Electromagnetic Analysis of Condenser Involving HVDC Systems Based on a Field-Circuit-Grid Coupled Model

The synchronous condenser (SC) is a dynamic reactive power compensation device. It provides reactive power support under steady-state conditions. At the same time, it can provide transient reactive power support during power system faults. When the power grid experiences faults, the nonlinear characteristics of the power system significantly increase. This leads to electromagnetic oscillations in the synchronous condenser. This article focuses on the global electromagnetic dynamic changes of the synchronous condenser under power grid fault conditions. The nature of the global electromagnetic transient analysis lies in covering the entire structure of the synchronous condenser, which includes both the stator core area of the synchronous condenser and the complex end leakage magnetic area. The proposed field-circuit-power grid coupling (FCPC) model integrates the synchronous condenser, excitation control system, and HVdc system into a unified framework. It addresses the limitation of traditional single field-circuit coupled models, which essentially fail to couple these external controls with the internal electromagnetic behavior of the synchronous condenser. It significantly improves computational efficiency. Finally, by comparing with the experimental results, the accuracy of the model is verified.