Abstract
Independent microgrids are widely used in islands and remote townships. However, power imbalance often leads to fluctuations in voltage and frequency, which inhibit the development of AC microgrids. To overcome such problems, this paper proposes an optimized full-bridge converter energy storage structure to realize power balance and optimization of the microgrid. The proposed structure has the characteristics of simple design, easy modularization, and flexible power regulation. First, the working structure and mathematical model are analyzed, and the power model is then established. From the viewpoint of capacitor charging and discharging and inverter, the active and reactive power control technology of the full-bridge structure is analyzed, and a multimode power coordinated control strategy is adopted to adjust and optimize the target power. Finally, the feasibility of the structure and control strategy is verified through a simulation and an experiment. In summary, this study is of great significance to the future promotion and application of AC microgrids.
Highlights
Independent microgrids are widely used in islands and remote townships
Power imbalance often leads to fluctuations in voltage and frequency, which inhibit the development of AC microgrids
This paper proposes an optimized full-bridge converter energy storage structure to realize power balance and optimization of the microgrid. e proposed structure has the characteristics of simple design, easy modularization, and flexible power regulation
Summary
E battery module provides active power and stabilizes the DC side voltage through a DC/ DC converter. E full-bridge converter structure provides flexible power compensation and improves the power quality of the AC side. The equivalent power model consists of a full-bridge converter voltage source US∠φ and AC microgrid power source UG∠0, where R is the equivalent resistance and Xj is the equivalent impedance. The power model of the full-bridge converter is established by vector analysis. According to the equivalent circuit and vector relationship shown, the full-bridge converter output can be obtained. From equations (4) and (5), it is possible to compensate the active power of the AC microgrid to stabilize its frequency and maintain the stability of the grid voltage by adjusting the reactive power of the system
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