Research on Control of A New Quasi-Z Source Photovoltaic Grid-Connected Inverter Based on Power Feedforward and Optimized PCI of Bacterial Foraging

Tao Hou; Yuhu Chen; Yannan Chen; Caiwen Bao

doi:10.6180/jase.202108_24(4).0015

Research on Control of A New Quasi-Z Source Photovoltaic Grid-Connected Inverter Based on Power Feedforward and Optimized PCI of Bacterial Foraging

Tao Hou¹ , Yuhu Chen This email address is being protected from spambots. You need JavaScript enabled to view it.¹ , Yannan Chen¹ , and Caiwen Bao¹

¹School of Automation and Electrical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China

Received: January 7, 2021
Accepted: March 28, 2021
Publication Date: August 1, 2021

Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.6180/jase.202108_24(4).0015

ABSTRACT

Aiming at the low power level of the two-level Z-source inverter, the current and voltage harmonic distortion rate is high, the output power quality is low, The diode Neutral Point Clamp (NPC) three-level Z source inverter has insufficient boost capacity, and the capacitor voltage stress is low, the Z source network of the three-level inverter is improved and applied to photovoltaic grid-connected. In order to speed up the dynamic response speed of the quasi-Z-source photovoltaic grid-connected system, and for the quasi-Z-source photovoltaic gridconnected system with the existing current inner loop control output harmonic distortion rate is high, and the steady-state error is large. the power feedforward bacterial foraging proportional complex integral (BFOA-PCI) control method is put foreward. The system about this method reduces the steady-state error through the PCI controller, and adds the bacterial foraging optimization proportional coefficient K_P and integral coefficient K_i , makes K_P and K_i any the optimal conditions can be achieved, and introduces the output power feedforward of the photovoltaic array in the voltage outer loop, and its output is used as the reference value of the current inner loop. The method speeds up the system’s response changes to the external environment, reduces the harmonic distortion rate, improves steady-state accuracy and the output power quality.

Keywords: Boost, Capacitor Voltage Stress,Power Feedforward, Bacterial Foraging Optimization Algorithm, PCI

REFERENCES

[1] X. Zhang and R.X. Cao. Solar photovoltaic grid power generation and its control inverter. China Machine Press, Beijing, China, 2011.
[2] P.Q. Li, X.J. Zeng, and J.Y. Huang. Equivalent Modeling of Grid-connected Photovoltaic Power Generation Systems for Comprehensive Load. Automation of Electric Power Systems, 40(8):43–50, 2016.
[3] Z GAO and X JIN. Research on a back-to-back cascaded H-bridge four-quadrant five-level converter. High Voltage Engineering, 42(1):79–84, 2016.
[4] Z.P. Luo, Y.H. Liu, and B.F. Yang. New Topology of Multi-level Converter with High- power Forced Commutation Current Injection. High Voltage Engineering, 41(7):2445–2450, 2015.
[5] N Kalaiarasi, Subhranshu Sekhar Dash, S Paramasivam, and C Bharatiraja. Investigation on ANFIS aided MPPT technique for PV fed ZSI topologies in standalone applications. Journal of Applied Science and Engineering (Taiwan), 24(2):261–269, 2021.
[6] Yam P. Siwakoti, Fang Zheng Peng, Frede Blaabjerg, Poh Chiang Loh, and Graham E. Town. Impedancesource networks for electric power conversion Part I: A topological review. IEEE Transactions on Power Electronics, 30(2):699–716, 2015.
[7] F.Z. Peng. Z-source inverter. IEEE Transactions on Industry Applications, 39(2):504–510, 2003.
[8] Biao Zhao, Qingguang Yu, Zhiwei Leng, and Xiyou Chen. Switched Z-source isolated bidirectional dc-dc converter and its phase-shifting shoot-through bivariate coordinated control strategy. IEEE Transactions on Industrial Electronics, 59(12):4657–4670, 2012.
[9] K. Deng, J. Mei, and J.Y. Zheng. Improved SwitchedInductor Quasi-Z Source Inverter. Power System Technology, 37(11):3254–3261, 2013.
[10] Y. Li, F. Fang, and X.Y. Xiao. Grid-connected Photovoltaic Control Strategy Based on Input-output Linearization for Quasi-Z-source Inverter. High Voltage Engineering, 45(7):2167–2176, 2019.
[11] Haitham Abu-Rub, Atif Iqbal, Sk Moin Ahmed, Fang Z. Peng, Yuan Li, and Ge Baoming. Quasi-Zsource inverter-based photovoltaic generation system with maximum power tracking control using ANFIS. IEEE Transactions on Sustainable Energy, 4(1):11–20, 2013.
[12] Yu Tang, Shaojun Xie, Chaohua Zhang, and Zegang Xu. Improved Z-source inverter with reduced Z-source capacitor voltage stress and soft-start capability. IEEE Transactions on Power Electronics, 24(2):409–415, 2009.
[13] R.X. Wang, Y.X. Wu, and H.H. Yang. Research on key technologies of double-stage T-type three-level photovoltaic inverter. Power System Protection and Control, 43(4):58–62, 2015.
[14] F Gao, PC Loh, and F Blaabjerg. Dual Z-source inverter with three-level reduced common-mode switching. IEEE Transactions On Industry Applications, 43(6):1597–1608, 2007.
[15] PC Loh, F Gao, and F Blaabjerg. Topological and modulation design of three-level Z-source inverters. IEEE Transactions on Power Electronics, 23(5):2268–2277, 2008.
[16] Qi Ming Cheng, Lei Shen, Yin Man Cheng, Lin Wei, and Yu Jiao Wang. Analysis and characteristics of new quasi-Z source three-level inverter. Dianji yu Kongzhi Xuebao/Electric Machines and Control, 24(9):134– 144, 2020.
[17] Madasamy Periyanayagam, V. Suresh Kumar, Bharatiraja Chokkalingam, Sanjeevikumar Padmanaban, Lucian Mihet-Popa, and Yusuff Adedayo. A modified high voltage gain quasi-impedance source coupled inductor multilevel inverter for photovoltaic application. Energies, 13(4), 2020.
[18] MS Kamalesh, Nattuthurai Senthilnathan, and Chokkalingam Bharatiraja. Design of a Novel Boomerang Trajectory for Sliding Mode Controller. International Journal of Control, Automation and Systems, 18(11):2917–2928, 2020.
[19] Q.M. Cheng, S.Y. Chu, and Y.M. Cheng. Quasi-PR Control System of Grid-connected Z-source Three-level Inverter. High Voltage Engineering, 42(10):3075–3082, 2016.
[20] X.Q. Guo. Generalized Proportional Complex Integral Control Scheme for PV Grid-connected Inverters. Proceedings of the CSEE, 35(13):3393–3399, 2015.
[21] H. Yang, G.J. Song, and Teng F.Y. Adaptive Proportional Complex Integral Control Strategy for Singlephase Grid-connected Inverter. High Voltage Engineering, 46(11):3790–3799, 2020.
[22] Qi Ming Cheng, Lei Shen, Yin Man Cheng, Lin Wei, and Yu Jiao Wang. Analysis and characteristics of new quasi-Z source three-level inverter. Dianji yu Kongzhi Xuebao/Electric Machines and Control, 24(9):134– 144, 2020.
[23] W. Liu, Y. Yang, T. Kerekes, and F. Blaabjerg. Generalized Space Vector Modulation for Ripple Current Reduction in Quasi-Z-Source Inverters. IEEE Transactions on Power Electronics, 36(2):1730–1741, 2021.
[24] Q.M. Cheng, M.Z. Zhao, and L. Shen. Modeling Analysis of Improved Quasi-Z Source Three-Level Inverter. High Voltage Engineering, 12(15):1–10, 2020.
[25] Z.H. Wang, Z.C. Li, and H.N. Wang. MPPT study of solar PV power system based on RBF neural network algorithm. Power System Protection and Control, 48(6):85– 91, 2020.
[26] Y. Shen, A. Luo, and Y.D. Chen. A Power FeedforwardBased Control Approach for Grid-Connection of Photovoltaic Generation and Its Stability Analysis. Power System Technology, 38(9):2449–2454, 2014.
[27] Q.P. Dai, L. Ma, and Y. Xi. Improved Bacterial Foraging Algorithm for Continuous Optimization Problem. Journal of University of Shanghai for Science and Technology, 35(2):103–106, 2013.