Performance Evaluation of Seven Level Reduced Switch ANPC Inverter in Shunt Active Power Filter with RBFNN Based Harmonic Current Generation Top Electrical Projects


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 seven-level 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.


  1. Power Quality
  2. Shunt Active Power Filter
  3. Multi-Level Inverters
  4. Active-Neutral-Point-Clamped Inverter
  5. Radial Basis Function Neural Network
  6. Adaptive Neuro-Fuzzy Inference System



Figure 1 Proposed Seven-Level ANPC Circuit Diagram


Figure 2: Source Voltage waveform

Figure 3: Load Current waveform

Figure 4: Current injected at the PCC

Figure 5: Source Current

Figure 6: DC-link voltage

Figure 7: THD waveform with the RBFNN approach

Figure 8: THD waveform with PQ theory


In this paper, harmonic mitigation and reactive power compensation are accomplished through a modified seven-level boost ANPC inverter, which exhibits high boosting ability with a minimized number of switches and low switching losses. The reference current generation is highlighted through the adaptive instantaneous p-q theory with RBFNN. Link voltage in the capacitor is retained by using ANFIS and which is compared by the PI controller and Fuzzy. PWM generator with a hysteresis current controller has generated the required gating sequence for the modified 7LB-ANPC inverter. A detailed comparison of modified 7LB-ANPC with the recent strategies has been carried out. The simulation results has highlighted that the proposed methodology is well suited for harmonic mitigation.


[1] P. S. Harmonics, “Power System Harmonics: An Overview,” in IEEE Transactions on Power Apparatus and Systems, vol. PAS-102, no. 8, pp. 2455-2460, Aug. 1983, doi: 10.1109/TPAS.1983.317745.

[2] M. Rastogi, R. Naik and N. Mohan, “A comparative evaluation of harmonic reduction techniques in three-phase utility interface of power electronic loads,” in IEEE Transactions on Industry Applications, vol. 30, no. 5, pp. 1149-1155, Sept.-Oct. 1994, doi: 10.1109/28.315225.

[3] R. Arnold, “Solutions to the power quality problem,” in Power Engineering Journal, vol. 15, no. 2, pp. 65-73, April 2001, doi: 10.1049/pe:20010202.

[4] D. Graovac, V. Katic and A. Rufer, “Power Quality Problems Compensation With Universal Power Quality Conditioning System,” in IEEE Transactions on Power Delivery, vol. 22, no. 2, pp. 968-976, April 2007, doi: 10.1109/TPWRD.2006.883027.

[5] B. Singh, K. Al-Haddad and A. Chandra, “A review of active filters for power quality improvement,” in IEEE Transactions on Industrial Electronics, vol. 46, no. 5, pp. 960-971, Oct. 1999, doi: 10.1109/41.793345.

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