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Open AccessArticle

Dead-Beat Control Cooperating with State Observer for Single-Phase Electric Springs

1
School of Electrical Engineering, Southeast University, 2 SiPaiLou, Nanjing 210096, China
2
Department of Industrial Engineering, University of Padova, 35131 Padova, Italy
*
Author to whom correspondence should be addressed.
Appl. Sci. 2018, 8(12), 2335; https://doi.org/10.3390/app8122335
Received: 18 September 2018 / Revised: 8 November 2018 / Accepted: 19 November 2018 / Published: 22 November 2018
Aiming at improving the performance of the existing for single-phase electric springs (ESs), such as the fastness of the voltage stabilization and the mitigation of the voltage harmonics across the critical loads (CLs), the dead-beat control cooperating with state observer is proposed in this paper. First, the δ control is reviewed, outlining its features of regulation of the CL voltage while keeping the ES operation stable. After describing the operation of an ES in the continuous-time domain by the state-space technique, its discrete-time model is formulated using the zero-order-hold (ZOH) algorithm. Then, the control system for an ES is designed around the dead-beat control cooperating with a state observer and implementing the two typical compensation functions achievable with the δ control, namely the pure reactive power compensation and the power factor correction. Results obtained by simulation demonstrate that the control system is able to both properly drive an ES and to implement the two functions. The results also show that the proposed control system has the advantage of eliminating harmonic components in CL voltage when grid voltage distorts. View Full-Text
Keywords: electric spring; dead-beat control; renewable energy source; distributed generation; microgrids; grid connected electric spring; dead-beat control; renewable energy source; distributed generation; microgrids; grid connected
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MDPI and ACS Style

Wang, Q.; Zuo, W.; Cheng, M.; Deng, F.; Buja, G. Dead-Beat Control Cooperating with State Observer for Single-Phase Electric Springs. Appl. Sci. 2018, 8, 2335.

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