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A direct power control strategy for three level neutral-point-clamped rectifier under unbalanced grid voltage

A direct power control strategy for three level neutral-point-clamped rectifier under unbalanced grid voltage

Authors :
Abdelouahab Bouafia
Billel Kahia
Zhenbin Zhang
Ralph Kennel
Mohamed Abdelrahem
Abdelmadjid Chaoui
Source :
Electric Power Systems Research. 161:103-113
Publication Year :
2018
Publisher :
Elsevier BV, 2018.

Abstract

Direct power control (DPC) strategy has attracted wide attention due to its advantages of simple structure, quick response, strong robustness, and elimination of current regulation loops/PWM blocks. Unfortunately, under unbalanced grid voltage, the conventional DPC (CDPC) scheme with the conventional definitions of active and reactive power cannot work well. In order to solve this problem, a new definition of the active power instead of the conventional one is proposed, discussed and used in this paper. As a result, good performance of the system is achieved and neither complicated calculation of a power compensation term nor positive/negative sequence extraction of grid voltages/currents are required. Then, a switching table based DPC strategy is designed based on the new definition of active power and conventional definition of reactive power. The corresponding switching table is suitable to achieve constant active power, constant reactive power and sinusoidal grid currents with very low total harmonic distortions (THDs). Simulation results are presented to confirm the theoretical study and the effectiveness of the proposed DPC with the new definition of active power (DPC-NP). The performance of the proposed DPC-NP is compared with that of the CDPC and that of the DPC with a new definition of reactive power (DPC-NQ).

Details

ISSN :
03787796
Volume :
161
Database :
OpenAIRE
Journal :
Electric Power Systems Research
Accession number :
edsair.doi...........26f36de7b8237c6af435a64223b05b9c
Full Text :
https://doi.org/10.1016/j.epsr.2018.04.010