Performance Evaluation of Seven Level Reduced Switch ANPC Inverter in Shunt Active Power Filter With RBFNN-Based Harmonic Current Generation

Abstract

One of the serious issues that a Power System faces is the Power Quality (PQ) disturbance which occur mainly because of the non-linear loads. Among these PQ disturbances, harmonics play a vital role which should to be mitigated along with reactive power compensation. In this paper, a modified sevenlevel boost Active-Neutral-Point-Clamped (7LB-ANPC) inverter is utilized as a Shunt Active Power Filter (SAPF). Another vital aspect of this work is to retain the link voltage across the capacitor, which is accomplished through a PI controller tuned with an Adaptive Neuro-Fuzzy Inference System (ANFIS). An adaptive instantaneous p-q theory is instigated in the direction of extracting reference current and the harmonic extraction is carried out by using Radial Basis Function Neural Network (RBFNN). Gating sequence of inverter is generated for the outputs, which are attained from ANFIS and RBFNN and thus the opposite harmonics are injected to the Point of Common Coupling (PCC) by which current harmonics are eliminated with reactive power compensation. The 7Lb-ANPC inverter has a minimized number of switching devices with low switching losses and high boosting ability. By RBFNN based reference current generation, the source current THD of 0.89% is achieved. The proposed methodology is simulated through MATLAB and in hardware by utilizing FPGA Spartan 6E.

Performance Evaluation of an Active Neutral-Point-Clamped Multilevel Converter for Active Filtering in G2V-V2G and V2H Applications

“…(10) (11) where the superscript * means a reference signal. Bearing in mind that the middle branch of the LCL filter (see zone C of Figure 1) is a low impedance path for the high-frequency harmonics, it is assumed that they are totally filtered out and thus, the low-frequency (LF) currents flowing through the inductances 𝐿 𝑓 and 𝐿 𝑔 are equal.…”

“…Therefore, it necessarily requires the implementation of voltage balancing compensating strategies [7], [8]. In spite of this requirement, three-level [9], five-level [10] and even seven-level [11] NPC/ANPC converters have been successfully applied in shunt active power filters (SAPF) for power quality improvement. In applications where these converters are further series-connected with an EV battery charger, the power transfer between the battery, the grid and the load can be controlled, thus giving rise to three possible operation modes, i.e., grid-to-vehicle (G2V), vehicle-to-grid (V2G) and vehicle-to-home (V2H) [12], [13].…”

A new seven‐level ANPC inverter structure with semiconductor device reduction

“…Few more ANPC-type MLIs have been proposed in Iqbal et al, 18,19 Sathik et al, 20 and Sivasubramanian et al 21,22 In Iqbal et al, 18 the seven-level output voltage is generated using eight switches; however, four switches need to be of bidirectional nature to support the inductive load. The higher number of bidirectional switches either increases the number of switches (with two switches in common emitter configuration) or the number of diodes (with four diodes and a switch).…”

“…An improvement to the topology of Iqbal et al 19 has been presented in Sathik et al 20 in which eight switches and two diodes are used for seven-level output voltage. Another seven-level APNC structure has been discussed in Sivasubramanian et al, 21,22 in which either a switch with four diodes has been used. The use of diodes in the topology limits its application in the highly inductive load, as during zero voltage level and voltage level equal to the input voltage, one diode is present in the conducting path which prevents the flow of reverse current.…”

“…The use of diodes in the topology limits its application in the highly inductive load, as during zero voltage level and voltage level equal to the input voltage, one diode is present in the conducting path which prevents the flow of reverse current. Therefore, in the topologies of Iqbal et al, 18,19 Sathik et al, 20 and Sivasubramanian et al, 21,22 a higher number of diodes results in higher losses and cost.…”