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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
- 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).
- Subjects :
- Computer science
020209 energy
020208 electrical & electronic engineering
Energy Engineering and Power Technology
Data_CODINGANDINFORMATIONTHEORY
02 engineering and technology
AC power
Grid
Rectifier
Control theory
Robustness (computer science)
0202 electrical engineering, electronic engineering, information engineering
Harmonic
Electrical and Electronic Engineering
Pulse-width modulation
Voltage
Power control
Subjects
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