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Integrating Hybrid Power Source Into an Islanded MV Microgrid Using CHB Multilevel Inverter Under Unbalanced and Nonline

This paper presents a control strategy for an islanded medium voltage microgrid to coordinate hybrid power source (HPS) units and to control interfaced multilevel inverters under unbalanced and nonlinear load conditions. The proposed HPS systems are connected to the loads through a cascaded H-bridge (CHB) multilevel inverter. The CHB multilevel inverters increase the output voltage level and enhance power quality. The HPS employs fuel cell (FC) and photovoltaic sources as the main and supercapacitors as the complementary power sources. Fast transient response, high performance, high power density, and low FC fuel consumption are the main advantages of the proposed HPS system. The proposed control strategy consists of a power management unit for the HPS system and a voltage controller for the CHB multilevel inverter. Each distributed generation unit employs a multiproportional resonant controller to regulate the buses voltages even when the loads are unbalanced and/or nonlinear. Digital time-domain simulation studies are carried out in the PSCAD/EMTDC environment to verify the performance of the overall proposed control system.

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Integrating Hybrid Power Source Into an Islanded MV Microgrid Using CHB Multilevel Inverter Under Unbalanced and Nonline

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  1. ELECTRICAL PROJECTS USING MATLAB/SIMULINK ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail:asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245 Integrating Hybrid Power Source Into an Islanded MV Microgrid Using CHB Multilevel Inverter Under Unbalanced and Nonlinear Load Conditions ABSTRACT: This paper presents a control strategy for an islanded medium voltage microgrid to coordinate hybrid power source (HPS) units and to control interfaced multilevel inverters under unbalanced and nonlinear load conditions. The proposed HPS systems are connected to the loads through a cascaded H-bridge (CHB) multilevel inverter. The CHB multilevel inverters increase the output voltage level and enhance power quality. The HPS employs fuel cell (FC) and photovoltaic sources as the main and supercapacitors as the complementary power sources. Fast transient response, high performance, high power density, and low FC fuel consumption are the main advantages of the proposed HPS system. The proposed control strategy consists of a power management unit for the HPS system and a voltage controller for the CHB multilevel inverter. Each distributed generation unit employs a multiproportional resonant controller to regulate the buses voltages even when the loads are unbalanced and/or nonlinear. Digital time-domain simulation studies are carried out in the PSCAD/EMTDC environment to verify the performance of the overall proposed control system. KEYWORDS: 1.Cascaded H-bridge (CHB) multilevel inverter 2.Fuel cell (FC) 3. Hybrid power source (HPS) 4. Multiproportional resonant (multi-PR) 5. Photovoltaic (PV) For Simulation Results of the project Contact Us Gmail:asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245

  2. ELECTRICAL PROJECTS USING MATLAB/SIMULINK ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail:asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245 6. Supercapacitor (SC) SOFTWARE: MATLAB/SIMULINK BLOCK DIAGRAM: Fig. 1. Proposed structure of the hybrid FC/PV/SC power source. Fig. 2. Proposed control strategy of hybrid FC/PV/SC power source. EXPECTED SIMULATION RESULTS: Fig. 3. Bode plots of loop transfer function of controlled system. Fig. 4. Microgrid response to unbalanced and nonlinear load changes in feeder F1 . (a) and (b) Instantaneous real and reactive powers of feeders. Fig. 5. Microgrid response to the unbalanced and nonlinear load changes applied to feeder F1 ; positive-sequence, negative-sequence, and harmonic components of loads currents at (a) feeder F1 and (b) feeder F2 . Fig. 6. Dynamic response of DG units to unbalanced and nonlinear load changes applied to feeder F1 . (a) and (b) Real and reactive power components of DG units. Fig. 7. Microgrid response to the unbalanced and nonlinear load changes applied to feeder F1 ; positive-sequence, negative-sequence, and harmonic currents of (a) DG1 and (b) DG2 . Fig. 8. (a) Instantaneous current waveforms, (b) five-level-inverter output voltage, and (c) voltage waveforms of each phase of DG1 ’s CHB inverter due to the nonlinear load connection to feeder F1 . Fig. 9. (a) Instantaneous current waveforms, (b) five-level-inverter output voltage, and (c) voltage waveforms of each phase of DG1 ’s CHB inverter due to the single-phase load disconnection from feeder F1 . Fig. 10. (a) Voltage THD and (b) VUF at DG1 ’s terminal. For Simulation Results of the project Contact Us Gmail:asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245

  3. ELECTRICAL PROJECTS USING MATLAB/SIMULINK ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail:asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245 Fig. 11. Voltages of dc links for DG1 ’s units. For Simulation Results of the project Contact Us Gmail:asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245

  4. ELECTRICAL PROJECTS USING MATLAB/SIMULINK ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail:asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245 Fig. 16. Dynamic response of DG1 to load changes; currents of FC stacks and PV units for each HPS. (a) Phase a, (b) phase b, and (c) phase c. Fig. 17. Dynamic response of DG1 to load changes; average current of SC module of each HPS. (a) Phase a, (b) phase b, and (c) phase c. CONCLUSION: This paper presents an effective control strategy for an islanded microgrid including the HPS and CHB multilevel inverter under unbalanced and nonlinear load conditions. The proposed strategy includes power management of the hybrid FC/PV/SC power source and a voltage control strategy for the CHB multilevel inverter. The main features of the proposed HPS include high performance, high power density, and fast transient response. Furthermore, a multi-PR controller is presented to regulate the voltage of the CHB multilevel inverter in the presence of unbalanced and nonlinear loads. The performance of the proposed control strategy is investigated using PSCAD/EMTDC software. The results show that the proposed strategy: 1) regulates the voltage of the microgrid under unbalanced and nonlinear load conditions, For Simulation Results of the project Contact Us Gmail:asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245

  5. ELECTRICAL PROJECTS USING MATLAB/SIMULINK ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail:asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245 2) reduces THD and improves power quality by using CHB multilevel inverters, 3) enhances the dynamic response of the microgrid under fast transient conditions, 4) accurately balances the dc-link voltage of multilevel inverter modules, and 5) effectively manages the powers among the power sources in the HPS system. REFERENCES: [1] H.Zhou,T. Bhattacharya,D.Tran,T. S. T. Siew, and A. M. Khambadkone, “Composite energy storage system involving battery and ultracapacitor with dynamic energymanagement in microgrid applications,” IEEE Trans. Power Electron., vol. 26, no. 3, pp. 923–930, Mar. 2011. [2] W. S. Liu, J. F. Chen, T. J. Liang, and R. L. Lin, “Multicascoded sources for a high- efficiency fuel-cell hybrid power system in high-voltage application,”IEEE Trans. Power Electron., vol. 26, no. 3, pp. 931–942, Mar. 2011. [3] A. Ghazanfari, M. Hamzeh, and H. Mokhtari, “A control method for integrating hybrid power source into an islanded microgrid through CHB multilevel inverter,” in Proc. IEEE Power Electron., Drive Syst. Technol. Conf., Feb. 2013, pp. 495–500. [4] IEEE Recommended Practice for Electric Power Distribution for Industrial Plants. ANSI/IEEE Standard 141, 1993. [5] IEEE Recommended Practices and Requirements for Harmonic Control in Electrical Power System. IEEE Standard 519, 1992. For Simulation Results of the project Contact Us Gmail:asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245

  6. ELECTRICAL PROJECTS USING MATLAB/SIMULINK ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail:asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245 For Simulation Results of the project Contact Us Gmail:asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245

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