Analysis and control of UPQC and its DC-link power by use of p-q-r instantaneous power theory
Fan Ng1; Man-Chung Wong1; Ying-Duo Han1,2
Conference Name1st International Conference on Power Electronics Systems and Applications
Source Publication2004 1st International Conference on Power Electronics Systems and Applications Proceedings
Conference Date9-11 Nov. 2004
Conference PlaceHong Kong, China

This paper provides an analysis and control algorithm of a three-phase four-wire unified power quality conditioner (UPQC) based on p-q-r instantaneous power theory. An UPQC is an integration of series and parallel active filters in order to compensate the voltage flicker/imbalance, reactive power, current imbalance, and harmonics. The p-q-r theory transforms a three-phase four-wire voltage space vector into a single dc voltage, and the corresponding currents into a dc based active power p-axis component and two imaginary power components, q-axis and r-axis. When p-q-r theory is used in reference current control, the p-axis current is filtered, and a corresponding r-axis component is added to force the reference current onto the α- β plane. The current space vector follows the movement of voltage space vector's projection on α- β plane, however, if there are harmonics and negative sequence exists in the voltage, the calculated reference current is not sinusoidal. In this paper an extra q-axis component is proposed to add to the original current compensation strategy based on p-q-r theory to maintain a sinusoidal current waveform under distorted voltage. With p-q-r theory, a control block model of an integration feedback of dc power is proposed to maintain the average dc power to be zero. The pole location of the feedback model and an equivalent model by detecting the instantaneous dc voltage is discussed. The proposed control algorithm is verified by simulation with PSCAD/EMTDC.

KeywordActive Filters Inverter Dc Power P-q-r Power Theory Power Quality Upqc
URLView the original
Indexed BySCI
WOS Research AreaEngineering
WOS SubjectEngineering, Electrical & Electronic
WOS IDWOS:000227668500005
被引频次[WOS]:11   [WOS记录]     [WOS相关记录]
Document TypeConference paper
专题University of Macau
Affiliation1.Department of Electrical and Electronics Engineering, University of Macau, Macau, SAR, P. R. China
2.Department of Electrical Engineering, Tsinghua University, Beijing, P. R. China
First Author AffilicationUniversity of Macau
GB/T 7714
Fan Ng,Man-Chung Wong,Ying-Duo Han. Analysis and control of UPQC and its DC-link power by use of p-q-r instantaneous power theory[C],2004:43-53.
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