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Aalborg Universitet Analysis and design of grid-current-feedback active damping for LCL resonance in grid-connected voltage source converters
| Content Provider | Semantic Scholar |
|---|---|
| Author | Chiang, Poh |
| Copyright Year | 2014 |
| Abstract | This paper investigates the active damping of LCLfilter resonance within single-loop grid current control of gridconnected voltage source converters. First, the basic analysis in the continuous s-domain reveals that the grid-current-feedback active damping forms a virtual impedance across the grid-side inductor, and the use of a high-pass filter with a negative sign shapes the virtual impedance by an RL damper paralleled by a negative inductance. It is further found that such a negative virtual inductance plays a critical role in mitigating the phase lag caused by the time delay in a digital control system. The instability induced by the negative virtual resistance, which is commonly experienced in the feedback-type active damping, can thus be avoided. A systematic design method of the highpass filter is also proposed by the help of root locus analysis in the discrete z-domain. Lastly, experimental tests are presented to validate the theoretical analysis. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://vbn.aau.dk/files/212136850/Preprint_Single_Loop.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
