Synchronous Frame Half-Period Repetitive Controller for Three-Phase UPS

FERNANDO BOTTERÓN AND HUMBERTO PINHEIRO

Recife - Brasil

Congreso; COBEP 2005; 2005

Abstract – This paper demonstrates that by modifying the basic period of the conventional repetitive controller in synchronous reference frame a number of benefits can be achieved. Among these benefits are: (i) a simple solution for the saturation of the output transformer due to the pole-zero cancellation issue; (ii) an additional degree of freedom for the selection of the harmonics to be rejected in abc stationary frame; (iii) a reduction of the memory space requirement for the implementation; (iv) an increase of the stability margin. As a result it is possible to obtain output voltages with reduced total harmonic distortion (THD) for both linear and non-linear loads. In order to confirm the claimed advantages of the proposed repetitive controller in synchronous reference frame and to demonstrate the steady-state performance, experimental results from a 10kVA space vector modulated three-phase inverter, fully controlled by a DSP TMS320F241, are presented.