Protection scheme against turn-to-turn fault for novel magnetic valve controllable reactor

Abstract

This paper focuses on the inter-turn protection scheme of a new type of reactive power compensation device-magnetic valve reactor. Aiming at the problem that the existing inter-turn protection scheme has insufficient sensitivity and causes the protection to refuse to act, this paper first introduces the topology of the new type of magnetic valve reactor in detail and analyzes the working state of the positive half cycle of its power supply and establishes mathematical model and physical model of valve reactor. Based on this model, the excitation winding of the magnetic valve reactor is analyzed, and the differential mode current component of the excitation winding is introduced to characterize the fault characteristics. According to the change of electric quantity before and after the fault, a new inter-turn protection scheme of magnetic valve reactor based on the fundamental frequency component of the differential mode current of the excitation winding group is constructed. After a large number of simulation experiments, the feasibility and effectiveness of the scheme are verified.