Abstract :
A comprehensive time domain model of a Custom Power Park, suitable for harmonic-oriented studies, is presented in this work. It comprises a Unified Power Quality Conditioner (UPQC), coupling transformers, a static transfer switch and a control system. The UPQC consists of two voltage source converters (VSC) connected throughout a DC capacitor. Whilst a shunt VSC maintains constant the bus voltage and the DC capacitor voltage, a series VSC feeds sensitive loads with distortion-free voltages. Furthermore, the transformer model incorporates its nonlinear characteristic and core losses. Limit cycle method based on the Poincaré map and a Newton method is applied to compute periodic steady-state solutions of the Custom Power Park. Important speed up factors up to 206 561 are reported to locate the limit cycle after a voltage disturbance. The application of the limit cycle method to custom power controllers paves the way to carry-out efficient power quality analysis at the distribution level.
Keywords :
Newton method; Poincare mapping; limit cycles; power capacitors; power control; power supply quality; power system harmonics; power transformers; switching convertors; time-domain analysis; transformer cores; DC capacitor voltage; Newton method; Poincare map; UPQC; bus voltage; control system; core loss; coupling transformer; custom power controller; custom power park; distortion-free voltage; limit cycle method; periodic steady-state solution; power quality analysis; shunt VSC; static transfer switch; time domain model; transformer model; unified power quality conditioner; voltage disturbance; voltage source converter; Capacitors; Limit-cycles; Load modeling; Steady-state; Switches; Voltage control; Voltage fluctuations;
