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http://dx.doi.org/10.6113/JPE.2018.18.5.1347

Frequency Synchronization of Three-Phase Grid-Connected Inverters Controlled as Current Supplies  

Fu, Zhenbin (Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China)
Feng, Zhihua (Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China)
Chen, Xi (Department of Substation Maintenance, State Grid Hefei Power Supply Company)
Zheng, Xinxin (Institute of Automotive Engineering Technology, Hefei University of Technology)
Yin, Jing (Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China)
Publication Information
Journal of Power Electronics / v.18, no.5, 2018 , pp. 1347-1356 More about this Journal
Abstract
In a three-phase system, three-phase AC signals can be translated into two-phase DC signals through a coordinate transformation. Thus, the PI regulator can realize a zero steady-state error for the DC signals. In the control of a three-phase grid-connected inverter, the phase angle of grid is normally detected by a phase-locked loop (PLL) and takes part in a coordinate transformation. A novel control strategy for a three-phase grid-connected inverter with a frequency-locked loop (FLL) based on coordinate transformation is proposed in this paper. The inverter is controlled as a current supply. The grid angle, which takes part in the coordinate transformation, is replaced by a periodic linear changing angle from $-{\pi}$ to ${\pi}$. The changing angle has the same frequency but a different phase than the grid angle. The frequency of the changing angle tracks the grid frequency by the negative feedback of the reactive power, which forms a FLL. The control strategy applies to non-ideal grids and it is a lot simpler than the control strategies with a PLL that are applied to non-ideal grids. The structure of the FLL is established. The principle and advantages of the proposed control strategy are discussed. The theoretical analysis is confirmed by experimental results.
Keywords
Current control; Frequency locked loops; Pulse width modulation inverters; Space vector pulse width;
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Times Cited By KSCI : 3  (Citation Analysis)
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