Design and implementation of a cascaded transformer coupled multilevel inverter-based shunt active filter under different grid voltage conditions

Abstract

Summary The paper describes the design aspect and control logic of a cascaded multilevel inverter‐based shunt active filter by employing single‐phase toroidal core transformers in cascaded manner which enable to operate with a single DC‐link capacitor. The presented topology uses a single DC‐link capacitor, thus minimizing the number of sensors and controller for voltage balancing. The induction of cascaded toroidal core transformer makes the system highly reliable as it minimizes the failure possibility of the DC‐link capacitor. For reference current generation, a perfect harmonic cancelation (PHC) control technique is implemented which is insensitive to distorted input condition and frequency deviation. To verify the effectiveness of the PHC controller, it is compared with a well‐known id‐iq control technique under ideal and non‐ideal supply main conditions. Furthermore, the developed topology is validated through MATLAB simulation and its prototype along with a well‐known DSP‐based FPGA controller.

Implementation of EMD‐based control algorithm for a cascaded multilevel inverter–based shunt active filter

“…Since the proposed set‐up employs a solo DC‐link capacitor, it can be efficiently regulated by using a PI controller. For a stable operation, the DC‐link capacitor must be designed on the basis of compensation requirement and losses occurring during balanced and unbalanced loading conditions . The hardware set‐up is implemented for low‐voltage and low‐power application, and the toroidal core construction enables reduced electromagnetic interference and lower acoustic noise.…”

Design and implementation of a novel asymmetrical multilevel inverter optimal hardware components

“…Also, finding their appropriate use in renewable energy systems, which include smart and micro‐grids. There is always a scope of improvement of efficiency and reduction in the harmonic distortion has always become a concern for the researchers …”

An improved SHM‐PWM scheme for three‐phase seven‐level CHB inverter to improve power quality by fulfilling CIGRE WG 36‐05 and EN 50160 and sharing equal power between the H‐bridge cells

“…Multilevel inverter topologies play an important role for medium‐voltage, medium‐, and high‐power level power system applications, such as static compensators (STATCOM), active shunt filter, and renewable energy integration to grid . It has some promising features such as lower harmonic distortion, lesser dv/dt voltage stresses on power semiconductor devices, requires lower voltage rating devices, high power handling capability, lower switching losses, higher conversion efficiency, producing smaller common mode voltage, and lesser electromagnetic interference (EMI) .…”