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Parallel Control of Converters with Energy Storage Equipment in a Microgrid

School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China
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Electronics 2019, 8(10), 1110; https://doi.org/10.3390/electronics8101110
Received: 29 July 2019 / Revised: 18 September 2019 / Accepted: 26 September 2019 / Published: 2 October 2019
(This article belongs to the Special Issue Advanced Power Conversion Technologies)
The converter in a microgrid uses the active power and reactive power (PQ) control strategy when connected to the grid. In the case of failure of large power grid, the converters are required to be connected in parallel under the condition of island to provide power to the load. In this paper, a new control method for the parallel operation of converters based on V/F control is proposed. The V/F control is used to ensure the output voltages have the same amplitude and frequency, then the converters will only produce circulating current caused by phase angle inconsistency. The phase angle self-synchronization strategy is proposed to make sure the phase angle of output voltage of all converters in the system are consistent. First, a large inductor is added to the end of the converter to ignore the line reactance, through this, the measured voltage at the terminal of the converter roughly equals to the voltage of the load, thus, every converter has the same reference of phase angle. Using the proposed phase angle self-synchronization strategy allows the output voltage of every converter to have the same phase angle, so that there is no circulating current between converters, and the power is evenly distributed among the converters. The simulation verification was carried out on the Power Simulation (PSIM) simulation platform, and the experimental verification was implemented on the hardware experimental platform. Both results demonstrate the effectiveness of the proposed strategy. This method is highly reliable and easy to implement, and the circulating current can be reduced effectively. View Full-Text
Keywords: microgrid; converter parallel operation; V/F control; large inductance; phase angle self-synchronization strategy microgrid; converter parallel operation; V/F control; large inductance; phase angle self-synchronization strategy
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Zhao, G.; Yang, H. Parallel Control of Converters with Energy Storage Equipment in a Microgrid. Electronics 2019, 8, 1110.

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