Modeling and Simulation of Seven-Level Cascaded H-Bridge Inverter Based Shunt Active Power Filter for Single-Phase Distribution System

In this paper, photovoltaic (PV) system interfaced single-phase shunt active power filter (SAPF) is proposed to supply uninterrupted and clean power to small-scale industries and domestic customers. The second-order generalized integrator (SOGI) is employed to extract the reference current of PV-SAPF. The proposed topology does not need voltage measurement and sensors on both the AC and DC side, just two current sensors are accustomed to measure converter and load currents. To be able to acquire an accurate reference source current, the distorted load is only processed through the SOGI control algorithm which does not need voltage-related information. The PV interfaced SAPF mainly is used for sustainable compensation of current disturbances and voltage interruption of the single-phase distribution system. The proposed topology utilizes the PV energy with an energy storage unit to meet the active power requirement of the utility grid. Besides, it exports the power generated in the PV system to the load during unavailability of grid supply. The PV-SAPF system subject to different types of loads can assess the performance of the system under steady-state and dynamic conditions. To validate the effectiveness of the proposed controller for PV interfaced SAPF, the simulation and experimental results are presented.

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Real Time Harmonic Mitigation Using Fuzzy Based Highly Reliable Three Dual-Buck Full-Bridge APF for Dynamic Unbalanced Load

International Journal of Emerging Electric Power Systems ◽

10.1515/ijeeps-2017-0167 ◽

2018 ◽

Vol 19 (3) ◽

Author(s):

Ranjeeta Patel ◽

Anup Kumar Panda

Keyword(s):

Distribution System ◽

Single Phase ◽

Dynamic Performance ◽

Active Power Filter ◽

Active Power ◽

Voltage Source ◽

Switching Frequency ◽

Shunt Active Power Filter ◽

Power Filter ◽

Inverter Circuit

Abstract This study presents a highly reliable 3-phase 4-wire, three dual-buck full-bridge shunt active power filter (3 DB FB APF) for distribution system. The proposed topology uses three single phase dual buck full bridge inverter sharing the same dc-link capacitor with high utilization of dc-bus voltage. The dual buck inverter circuit composed of one power switch and one diode leg instead of two power switches conventional inverter leg effectually eliminate the undesirable “shoot-through” phenomenon occurs in conventional inverter circuit. The fuzzy and adaptive hysteresis current controller based id-iq control strategy has been adopted to generate optimized switching frequency. For validation, the proposed topology is implemented in the OPAL-RT LAB using OP5142-Spartan 3 FPGA. The dynamic performance of the proposed 3 DB FB APF is assessed for sinusoidal, unbalanced and non-sinusoidal voltage source condition with unbalanced non-linear load that is when both three-phase and single-phase loads are present in the system. Besides, the results with proportional-integral (PI) controller are compared with FLC in terms of harmonic compensation. Furthermore, a comparison has been made between split capacitor dual buck half bridge active power filter (2C DB HB APF) and proposed 3 DB FB APF based on switch power rating.

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