Design of Effective Passive Damping Resistor of Grid-Connected Inverter with LCL Filter for Industrial Applications

This paper proposes design rule to determine an effective passive damping resistor of grid-connected inverter with LCL filter for industry applications, where it considers the stability of current control and minimum power loss by defining three standard criteria based on stability analysis. Despite of losses due to resistor, passive damping is the simplest way to reduce filter resonance, which is widely used in the industrial field. However, there is no clear criterion for determining damping resistor. This paper suggests three standard criteria to determine an effective damping resistor that can guarantee system stability for industrial applications. The analytic equivalent model takes into account system delays that are composed of processing and PWM delays. The applicable range of damping resistors that should be able to attenuate the filter resonance are mathematically derived from equivalent modeling and parameters of the system. To verify the validity of the effective damping resistor that is determined, 7 kW grid-connected inverter is simulated and implemented. Experimental results are matched to simulation results and analysis; in particular, the stability of current control is completely guaranteed with a low total harmonic distortion of 3.6% and minimum power loss of 28.79 W (0.41%) with effective damping resistor.

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