Characteristics analysis of micro‑source half‑bridge converter series Y‑connection based microgrid systems

Xinggui Wang; Yingjie Ding; Jinjian Li; Yongji Guo

Characteristics analysis of micro‑source half‑bridge converter series Y‑connection based microgrid systems

Vol. 23, No. 10, pp. 1483-1495, Oct. 2023

10.1007/s43236-023-00638-8

Microgrid

Half-bridge converters in series

Output characteristics

Modulation strategy

In-phase voltage imbalance

Abstract

Due to the problems of serious circulation current, large switching loss, high harmonic content, unstable voltage, and high engineering cost in existing microgrid structures, a micro-source half-bridge converter series Y-connection-based microgrid (HCSY-MG) is proposed in this paper. On the basis of the equivalent circuit in the system islanding state, the output characteristics of the system and the corresponding influencing factors under both square wave modulation and phase-shifted pulse width modulation (PS-PWM) are analyzed. Under single-cycle square wave modulation, since the DC-side capacitors of some micro-source half-bridge converters are affected by reactive power, which can result in system output voltage fluctuations or even an in-phase imbalanced state, a multi-period cycle modulation strategy is applied to solve this problem. Under the PS-PWM strategy, if the modulation degree and capacitance of the micro-source half-bridge converters are reasonably set, the output voltage of the system can be guaranteed to be in an in-phase equilibrium state. A simulation model and an experimental platform are built to verify the feasibility of the system and the effectiveness of the proposed strategy.

Statistics

Show / Hide Statistics

Cumulative Counts from September 30th, 2019
Multiple requests among the same browser session are counted as one view. If you mouse over a chart, the values of data points will be shown.

Cite this article

[IEEE Style]

X. Wang, Y. Ding, J. Li, Y. Guo, "Characteristics analysis of micro‑source half‑bridge converter series Y‑connection based microgrid systems," Journal of Power Electronics, vol. 23, no. 10, pp. 1483-1495, 2023. DOI: 10.1007/s43236-023-00638-8.

[ACM Style]

Xinggui Wang, Yingjie Ding, Jinjian Li, and Yongji Guo. 2023. Characteristics analysis of micro‑source half‑bridge converter series Y‑connection based microgrid systems. Journal of Power Electronics, 23, 10, (2023), 1483-1495. DOI: 10.1007/s43236-023-00638-8.