Voltage sensorless predictive direct power control of three-phase PWM converters

YuKun Tao; Qinghua Wu; Lei Wang; Wenhu Tang

Voltage sensorless predictive direct power control of three-phase PWM converters

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Author(s): YuKun Tao ¹ ; Qinghua Wu ^{1, 2} ; Lei Wang ¹ ; Wenhu Tang ¹
- Affiliations: 1: School of Electric Power Engineering, South China University of Technology, Guangzhou, 510641, People's Republic of China ;
  2: Department of Electrical Engineering and Electronics, The University of Liverpool, Liverpool, L69 3GJ, UK
Source: Volume 9, Issue 5, 20 April 2016, p. 1009 – 1018
DOI: 10.1049/iet-pel.2014.0713 , Print ISSN 1755-4535, Online ISSN 1755-4543

Received 08/09/2014, Accepted 05/08/2015, Revised 31/07/2015, Published 20/04/2016

This study develops a voltage sensorless predictive direct power control (PDPC) strategy for three-phase pulsewidth modulation (PWM) converters using accurate virtual flux (VF) estimation. This proposed PDPC can realise simultaneous control of the instantaneous active and reactive power, and achieve a constant switching frequency operation by adopting an on-line corrective space vector modulation modulator. AC voltage sensors are removed by using the following two techniques. One is that an accurate VF observer is employed to compensate the magnitude and phase errors introduced by the first-order low pass filter. The other is that grid voltages are estimated using the VF based estimation of instantaneous active and reactive power as intermediate variables. In addition, the time delay existing in a real system is taken into account in the proposed control model. Comparative results demonstrate the excellent performance of the proposed approach compared with the conventional look-up-table DPC and the conventional PDPC.

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Voltage sensorless predictive direct power control of three-phase PWM converters

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