Abstract
The control challenges of LCL-type grid-connected inverter arise from the resonance problem. At the resonance frequency, the LCL filter resonance causes a sharp phase step down of −180° with a high resonance peak. This resonance peak would easily lead to system instability and should be damped. In this chapter, the resonance hazard resulted by the LCL filter is reviewed first, and then, the existing passive- and active-damping solutions are described systematically to reveal the relationship among them. Among the six basic passive-damping solutions, adding a resistor in parallel with capacitor shows the best damping performance, but it results in a high power loss. In order to avoid the power loss in the damping resistor, the active-damping solutions equivalent to a resistor in parallel with capacitor are derived, and the capacitor-current-feedback active damping is superior for its simple implementation and effectiveness. This chapter provides the basis for the study of the control techniques of LCL-type grid-connected inverter in the following chapters.
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Ruan, X., Wang, X., Pan, D., Yang, D., Li, W., Bao, C. (2018). Resonance Damping Methods of LCL Filter. In: Control Techniques for LCL-Type Grid-Connected Inverters . CPSS Power Electronics Series. Springer, Singapore. https://doi.org/10.1007/978-981-10-4277-5_4
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DOI: https://doi.org/10.1007/978-981-10-4277-5_4
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