Control of T-Type Neutral Point Clamped Inverter for Solar Grid Connected System with Artificial Neural Network Controller

N Uday Kumar, M Chakravarthy, B Mangu

Abstract


In grid-connected photovoltaic applications, three-phase multi-level inverters (MLI) such as Neutral point clamped (NPC), Flying capacitor (FC), and full bridge inverters (FBI) are more popular in medium voltage drive applications. However, the main drawback is leakage current (LC) flowing through inverter leading to common mode voltage (CMV), current waveform distortion, and reduction in the system's overall performance. In this article transformer less grid connected NPC inverter (TLGC-NPCI) and transformer less T-type grid connected NPC inverter (T3LGC-NPCI) is presented. T3LGC-NPCI offers numerous advantages over TLGC-NPCI, including less LC and CMV, minimum requirement of gate drive signals leads to reduce switching and conduction losses. The multi-objectives of the suggested work are (i) maintaining constant DC-Link (DCL) voltage during different solar irradiation and constant temperature using artificial neural network controller (ANNC) (ii) Space vector pulse width modulation (SVPWM) technique is implemented to reduce LC flowing through inverter and to maintain constant CMV, and (iii) the reduction in total harmonic distortion (THD) of load current. The performance analysis of the proposed system was done in Matlab/ Simulink platform. A comparative analysis with the available methods like the Proportional integral Controller (PIC) was carried out to exhibit the viability of the developed control technique.


Keywords


Common mode voltage, Leakage Currents, Transformer less Inverter, Photovoltaic system, three-level NPC, Power Quality, THD.

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References


. Amit Kumar Gupta, Himanshu Agrawal and Vivek Agarwal, "A Novel Three-Phase Transformerless H-8 Topology With Reduced Leakage Current for Grid-Tied Solar PV Applications," in IEEE Transactions on Industry Applications, vol. 55, no. 2, pp. 1765-1774, March-April 2019

. Wenjie Chen, Xu Yang, Weiping Zhang and Xiaomei Song, "Leakage Current Calculation for PV Inverter System Based on a Parasitic Capacitor Model," in IEEE Transactions on Power Electronics, vol. 31, no. 12, pp. 8205-8217, Dec. 2016

. R. S. Farswan and B. G. Fernandes, "Analysis of different PWM schemes for 3-level boost converter to reduce current stress in DC link capacitors of single phase NPC inverter," 2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC), New Orleans, LA, USA, pp. 1-6, 2015

. L. Ma, T. Kerekes, R. Teodorescu, X. Jin, D. Floricau and M. Liserre, "The high efficiency transformer-less PV inverter topologies derived from NPC topology," 2009 13th European Conference on Power Electronics and Applications, Barcelona, Spain, 2009, pp. 1-10.

. X. Guo, N. Wang, B. Wang, Z. Lu and F. Blaabjerg, "Evaluation of Three-Phase Transformerless DC-Bypass PV Inverters for Leakage Current Reduction," in IEEE Transactions on Power Electronics, vol. 35, no. 6, pp. 5918-5927, June 2020

. V. Sonti, S. Jain and B. S. K. R. Pothu, "Leakage Current Minimization Using NPC DC Decoupling Method for Three-Phase Cascaded Multilevel PV Inverter," in IEEE Transactions on Circuits and Systems II: Express Briefs, vol. 67, no. 12, pp. 3247-3251, Dec. 2020

. V. Sonti and S. Jain, "DC Decoupling-Based Three-Phase Three-Level Transformerless PV Inverter Topology for Minimization of Leakage Current," in IEEE Transactions on Industrial Electronics, vol. 66, no. 10, pp. 8273-8278, Oct. 2019

. Vinoth Jayakumar, Bharatiraja Chokkalingam, and Josiah Lange Munda, "Performance Analysis of Multi-Carrier PWM and Space Vector Modulation Techniques for Five-Phase Three-Level Neutral Point Clamped Inverter," in IEEE Access, vol. 10, pp. 34883-34906, 2022

. Tianbao Yu , Wenchao Wan , and Shanxu Duan, "A Modulation Method to Eliminate Leakage Current and Balance Neutral-Point Voltage for Three-Level Inverters in Photovoltaic Systems," in IEEE Transactions on Industrial Electronics, vol. 70, no. 2, pp. 1635-1645, Feb. 2023

. Anirban Pal and Kaushik Basu, "A PWM ZVS High-Frequency-Link Three-Phase Inverter With T-Type NPC Unfolder," in IEEE Transactions on Industrial Electronics, vol. 67, no. 9, pp. 7146-7156, Sept. 2020

. A. Ghodke and K. Chatterjee, "Three-phase three-level one-cycle controlled bidirectional AC-to-DC NPC converter," 2012 IEEE 13th Workshop on Control and Modeling for Power Electronics (COMPEL), Kyoto, Japan, 2012, pp. 1-7

. Zhi-Xiang Zou , Marco Liserre, Zheng Wang and Ming Cheng, "Stability Assessment of Voltage Control Strategies for Smart Transformer-Fed Distribution Grid," in IEEE Access, vol. 8, pp. 185146-185157, 2020

. Z. Zou, J. Tang, G. Buticchi and M. Liserre, "Stabilization of Distribution Grids With High Penetration of Renewables: The Path From Decentralized Control to a Centralized One," in IEEE Industrial Electronics Magazine.

. S. Madishetti, B. Singh and G. Bhuvaneswari, "Three-Level NPC-Inverter-Based SVM-VCIMD With Feedforward Active PFC Rectifier for Enhanced AC Mains Power Quality," in IEEE Transactions on Industry Applications, vol. 52, no. 2, pp. 1865-1873, March-April 2016

. S. Walz, G. Buticchi and M. Liserre, "Comparison of Finite Control Set and Hysteresis Based Model Predictive Control for NPC and T-Type Converter in case of low carrier ratio," 2019 IEEE 28th International Symposium on Industrial Electronics (ISIE), Vancouver, BC, Canada, 2019, pp. 250-254

. Mohammad Sharifzadeh, Mohammad Babaie , Gabriel Chouinard , Kamal Al-Haddad , Ramon Portillo , Leopoldo Garcia Franquelo and K. Gopakumar, "Hybrid SHM-PWM for Common-Mode Voltage Reduction in Three-Phase Three-Level NPC Inverter," in IEEE Journal of Emerging and Selected Topics in Power Electronics, vol. 9, no. 4, pp. 4826-4838, Aug. 2021

. X. Guo, Y. Yang, R. He, B. Wang and F. Blaabjerg, "Transformerless Z-Source Four-Leg PV Inverter With Leakage Current Reduction," in IEEE Transactions on Power Electronics, vol. 34, no. 5, pp. 4343-4352, May 2019

. C. K. Das, A. Kirubakaran and V. T. Somasekhar, "A Five-Level Quasi Z-Source Based NPC Inverter for PV Applications," 2019 IEEE International Conference on Environment and Electrical Engineering and 2019 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe), Genova, Italy, 2019, pp. 1-5

. Manoranjan Sahoo and Sivakumar Keerthipati, "A Three-Level LC-Switching-Based Voltage Boost NPC Inverter," in IEEE Transactions on Industrial Electronics, vol. 64, no. 4, pp. 2876-2883, April 2017

. S. K. Giri, S. Banerjee and C. Chakraborty, "An Improved Modulation Strategy for Fast Capacitor Voltage Balancing of Three-Level NPC Inverters," in IEEE Transactions on Industrial Electronics, vol. 66, no. 10, pp. 7498-7509, Oct. 2019




DOI (PDF): https://doi.org/10.20508/ijrer.v14i4.14465.g8945

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