A hybrid controllable shunt reactor of transformer type

This paper presents a hybrid controllable shunt reactor of transformer type (HCSRT) to solve the harmonic problem of the thyristor-controlled reactor (TCR). The proposed device has advantages of both the controllable shunt reactor of transformer type (CSRT) and static VAr generator (SVG). The HCSRT uses a voltage source inverter (VSI) to replace the bidirectional thyristor valve of the CSRT to control the output current of the regulating winding. By introducing duplicate winding ratings, the reactance of HCSRT can be continuously and smoothly regulated in the total of the N-th power of 2 steps with N control windings. A hybrid static VAr compensator of transformer type (HSVCT), capable of compensating both the inductive and capacitive reactive powers, is also presented in this paper. Theoretical analysis and simulations demonstrate advantages of HCSRT and HSVCT, including fast transient response, wide regulating region, minor harmonic pollution and high cost-performance ratio.