State Observer for Grid-Voltage Sensorless Control of a Converter Equipped with an LCL Filter: Direct Discrete-Time Design
Research output: Contribution to journal › Article › Scientific › peer-review
Synchronization with the power system is an essential part of control of grid-connected converters. This paper proposes a grid-voltage sensorless synchronization and control scheme for a converter equipped with an LCL filter, measuring only the converter currents and the dc voltage. A discrete-time pole-placement design method is used to formulate an adaptive full-order observer for the estimation of the frequency, angle, and magnitude of the grid voltage. The proposed discrete-time design method enables straightforward implementation and suits low sampling rates better than its continuous-time counterpart. The analytically derived design is experimentally validated, and the results demonstrate rapid convergence of the estimated quantities. Moreover, the experimental tests show that grid-voltage sensorless operation is possible under balanced and unbalanced grid disturbances and distorted grid conditions.
|Number of pages||13|
|Journal||IEEE Transactions on Industry Applications|
|Publication status||Published - 1 Jul 2016|
|MoE publication type||A1 Journal article-refereed|
- Active front-end rectifier, adaptive observer, distributed generation, line-voltage sensorless, small-signal linearization, state feedback, synchronization