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Performance investigation of a three-phase three-wire series-parallel compensated line-interactive UPS system based on SVPWNI and controlled by two digital signal processors

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5 Author(s)
Ke Dai ; Dept. of Appl. Electron. Eng., Huazhong Univ. of Sci. & Technol., Wuhan, China ; Peiguo Liu ; Guixin Wang ; Yong Kang
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A three-phase three-wire series-parallel compensated line-interactive UPS system based on space vector PWM and controlled by two individual digital signal processors is proposed in this paper. A series voltage-source converter works as sinusoidal current source in phase with the corresponding utility voltage to make power factor unity, while a parallel voltage-source converter is controlled as constant-voltage constant-frequency sinusoidal voltage source tracking the phase of utility voltage also. Therefore, this kind of UPS system has the capability of universal line-power filtering, which can suppress the voltage harmonic at the utility and the current harmonic deriving from non-linear load. In addition, the proposed system can compensate reactive power simultaneously. A 10 kVA prototype was established and tested in detail in the case of three different typical loads. The theory analyses are verified by abundant experimental results.

Published in:

Telecommunications Energy Conference, 2003. INTELEC '03. The 25th International

Date of Conference:

23-23 Oct. 2003