Adaptive control for MMC-SAPF with balanced and unbalanced PCC voltage
- Resource Type
- Conference
- Authors
- Li, Chengjing; Dai, Ke; Lin, Derong; Xu, Chen; Dai, Ziwei
- Source
- IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society Industrial Electronics Society , IECON 2017 - 43rd Annual Conference of the IEEE. :67-72 Oct, 2017
- Subject
- Communication, Networking and Broadcast Technologies
Computing and Processing
Power, Energy and Industry Applications
Robotics and Control Systems
Signal Processing and Analysis
Transportation
Harmonic analysis
Radio frequency
Voltage control
Power harmonic filters
Equivalent circuits
Control systems
Modular multilevel converter
active power filter
unbalanced PCC voltage
nonlinear load
multiple synchronous reference frame
- Language
Three-phase three-wire shunt active power filter (SAPF) with traditional positive-sequence control can only compensate part of the nonlinear load current harmonics if the PCC voltage changes from balanced to unbalanced condition. Changes of both nonlinear load current harmonic components and equivalent circuit for modular multilevel converter based SAPF (MMC-SAPF) are analyzed in the paper. To solve the problems caused by PCC voltage switches between balanced and unbalanced conditions while MMC-SAPF operating, an adaptive control strategy for MMC-SAPF including the voltage unbalance detection and smoothly switching control on enabling/disabling the negative-sequence strategy is proposed. Simulation and experimental tests validate the effectiveness of the proposed control scheme on a downscaled 64V/2kVA apparatus.