Fig. 1. Configuration of parallel connected inverters withLCL-filters
Fig. 2. Circuit diagram of a single grid-connected inverter
Fig. 3. Thevenin equivalent model of a single grid-connected inverter
Fig. 4. Thevenin equivalent model of parallel-connectedinverters with LCL-filters
Fig. 5. Variation of admittance of conventional parallel connected inverters
Fig. 6. Block diagram of the conventional notch filter active damping method
Fig. 7. Block diagram of conventional virtual resistor active damping
Fig. 8. Block diagram of proposed sensorless damping method
Fig. 9. Admittance of parallel connected inverters withnotch filter method
Fig. 10. Admittance of parallel connected inverters withproposed sensorless active damping method
Fig. 11. Estimated capacitor current and actual capacitor current
Fig. 12. Simulation waveforms of 8-parallel-connectedinverter with conventional notch filter method
Fig. 13. Simulation waveforms of 8-parallel-connectedinverter with conventional virtual resistor method
Fig. 14. Simulation waveforms of 8-parallel-connectedinverter with proposed active damping method
Fig. 15. Experimental results of the 3-parallel connectedinverter with proposed active damping method
Table 1. System parameters of inverter system
참고문헌
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