Title :
Single phase UPS inverter with variable output voltage and digital state feedback control
Author :
Gueldner, Henry ; Wolf, Henrik ; Blacha, Norbert
Author_Institution :
Power Electron., Tech. Univ. Dresden, Germany
Abstract :
Uninterruptible power supplies (UPS) are needed to provide a source of electrical energy with high quality, stability and disposability in case the public mains cannot fulfil these demands. The technical requirements of low power UPS systems are, above all, a high power density, small size and weight, low noise level and a stable and harmonic free output voltage. This paper presents a concept of a transformerless single-phase inverter for a battery-supplied static online UPS, which is especially designed to generate two output voltages with different frequencies. The presented inverter topology has the same efficiency and device stresses, irrespective of the chosen output voltage at the same output power. A design procedure of a predictive digital state feedback control scheme to ensure a sufficient quality of output voltage under typical linear and nonlinear load conditions is shown. Additional necessary functions like overload and short circuit protection are implemented in the control strategy. Finally some simulation results of the proposed concept using SIMPLORER(R) are given
Keywords :
DC-AC power convertors; control system analysis computing; control system synthesis; digital control; load (electric); power engineering computing; predictive control; state feedback; uninterruptible power supplies; voltage control; battery-supplied static online UPS; control design procedure; device stresses; load conditions; noise level; output voltage quality; power density; predictive digital state feedback control; single-phase UPS inverter; transformerless single-phase inverter; uninterruptible power supplies; variable output voltage; Frequency; Inverters; Noise level; Power generation; Power system harmonics; Stability; Stress; Topology; Uninterruptible power systems; Voltage;
Conference_Titel :
Industrial Electronics, 2001. Proceedings. ISIE 2001. IEEE International Symposium on
Conference_Location :
Pusan
Print_ISBN :
0-7803-7090-2
DOI :
10.1109/ISIE.2001.931627