The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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An Improved Harmonic Compensation Method for a Single-Phase Grid Connected Inverter

단상 계통연계 인버터를 위한 개선된 고조파 보상법

  • Received : 2018.11.08
  • Accepted : 2018.12.26
  • Published : 2019.06.20
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Abstract

Grid-connected inverters should satisfy a certain level of total harmonic distortion (THD) to meet harmonics standards, such as IEEE 519 and P1547. The output quality of an inverter is typically degraded due to grid voltage harmonics, dead time effects, and the device's turn-on/turn-off delay, which all contribute to increasing the THD value of the output. The use of a harmonic controller is essential to meet the required THD value for inverter output under a distorted grid condition. In this study, an improved feedforward harmonic compensation method is proposed to effectively eliminate low-order harmonics in the inverter current to the grid. In the proposed method, harmonic components are directly compensated through feedforward terms generated by the proportional resonant controller with the grid current in a stationary frame. The proposed method is simple to implement but powerful in eliminating harmonics from the output. The effectiveness of the proposed method is verified through simulation using PSIM software and experiments with a 5 kW single-phase grid-connected inverter.

Keywords

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Fig. 2. Rotating reference frame(RRF) current controller for single phase GCIs.

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Fig. 4. Simplified block diagram of a current controller.

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Fig. 6. Block diagram of the conventional harmonic compensation method in RRF.

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Fig. 7. FFT analysis of 3rd harmonic in SRF and RRF.

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Fig. 8. Block diagram of the selective harmonic compensation method in RRF.

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Fig. 9. Block diagram of the proposed harmonic compensation method.

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Fig. 10. Simplified block diagram of the proposed harmonic compensation method.

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Fig. 12. Bode plot of the open loop gain T(s) with and without harmonic compensator.

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Fig. 13. Bode plot of the closed loop gain with and without harmonic compensator.

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Fig. 20. Comparison of the conventional and the proposed harmonic compensator. (a) 3rd harmonic reduction, (b) harmonic reduction rate, (c) Total Harmonic Distortion.

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Fig. 1. Stationary reference frame(SRF) current controller for single phase GCIs.

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Fig. 3. Control block diagram of a current controller in RRF.

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Fig. 5. Simulation result of a current controller without a harmonic controller at 5kW.

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Fig. 11. Bode plot of the harmonic compensator at different h values.

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Fig. 14. Simulation results of a conventional harmonic compensation method at 5kW.

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Fig. 15. Simulation results of the proposed harmonic compensation method at 5kW.

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Fig. 16. Experimental setup of the SPGCI.

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Fig. 17. Experimental results without a harmonic controller at 5kW.

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Fig. 18. Experimental results with a conventional harmonic controller at 5kW.

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Fig. 19. Experimental results with the proposed harmonic controller at 5kW.

TABLE I SYSTEM PARAMETER FOR SINGLE PHASE GRID CONNECTED INVETER

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