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A Hysteresis Current Controller for PV-Wind Hybrid Source Fed STATCOM System Using Cascaded Multilevel Inverters

  • Palanisamy, R. (Dept. of Electrical and Electronic Engineering, SRM University) ;
  • Vijayakumar, K. (Dept. of Electrical and Electronic Engineering, SRM University)
  • Received : 2017.06.30
  • Accepted : 2017.09.26
  • Published : 2018.01.01

Abstract

This paper elucidates a hysteresis current controller for enhancing the performance of static synchronous compensator (STATCOM) using cascaded H-bridge multilevel inverter. Due to the rising power demand and growing conventional generation costs a new alternative in renewable energy source is gaining popularity and recognition. A five level single phase cascaded multilevel inverter with two separated dc sources, which is energized by photovoltaic - wind hybrid energy source. The voltages across the each dc source is balanced and standardized by the proposed hysteresis current controller. The performance of STATCOM is analyzed by connecting with grid connected system, under the steady state & dynamic state. To reduce the Total Harmonic Distortion (THD) and to improve the output voltage, closed loop hysteresis current control is achieved using PLL and PI controller. The performance of the proposed system is scrutinized through various simulation results using matlab/simulink and hardware results are also verified with simulation results.

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Fig. 1. Flowchart for incremental conductance - MPPTalgorithm

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Fig. 2. PV panel characteristics showing MPP usingIncremental Conductance method

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Fig. 3. Single phase five level cascaded H-bridge inverter

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Fig. 4. Block diagram of STATCOM with proposed control scheme

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Fig. 5. HCC system (a) schematic hysteresis vectordiagram (b) Error current calculation system

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Fig. 6. block diagram for closed loop operation of proposed system

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Fig. 7. HCC for cascaded multilevel inverter

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Fig. 8. PV array ? output current and voltage

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Fig. 9. Rectified dc voltage using 3-phase rectifier

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Fig.10. Wind energy - PMSG output voltage

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Fig. 11. Single phase H-bridge inverter voltage withHysteresis Band variation: (a) HB=0.1, (b) HB=0.4 (c)

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Fig. 12. Switching pulses for leg 1 & 2 of H-bridge inverter

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Fig. 13. Split inductor current waveform Id & Iq

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Fig. 14. Grid current / Voltage synchronization: (a) SPWM(b) Hysteresis current control

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Fig. 15. THD analysis: (a) output voltage (b) output current

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Fig. 16. H-bridge inverter output voltage at 0.95 (HysteresisBand) and THD analysis

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Fig. 17. Split inductor based output voltage and THDanalysis

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Fig. 18. Output current waveform of inverter with splitinductor

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Fig. 19. Experimental setup of proposed system

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Fig. 20. Comparison of output voltage for various invertertopologies

Table 1. THD comparison for various inverter topologies with HCC algorithm at 0.95 (hysteresis band)

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