Abstract
This paper proposes a distributed coordination control for multiple bidirectional power converters (BPCs) in a hybrid AC/DC microgrid with consideration of state-of-charge (SOC) of storages. The researched hybrid AC/DC microgrid is composed of both AC and DC subgrids connected by multiple parallel BPCs. In the literature, the storages of a hybrid microgrid are considered to allocate in only the AC subgrid or DC subgrid, which reduces the reliability of the whole system, especially during the islanded mode. Besides, the SOC management has not been considered in BPCs’ operating strategy. This paper considers a hybrid microgrid topology which has energy storages in both AC side and DC side. This ensures the reliability while increasing the complexity of the control strategy at the same time. Further, a distributed coordination control method for multiple BPCs based on SOC was proposed to enhance the reliability of hybrid microgrid. Finally, the performance of the proposed control methods was verified by real-time hardware-in-loop (HIL) tests.
Highlights
Microgrid has become a widely accepted concept due to its high reliability and high flexibility.The operating environment of microgrid is more complex than normal distribution network because there are fluctuating loads and intermittent distributed generators
When the hybrid microgrid operates in the islanded mode, the bidirectional power converters (BPCs) must work as voltage sources to maintain the bus voltage for the subgrid that does not have storage system
A SOC based distributed coordination control method is proposed for parallel BPCs in the hybrid AC/DC microgrid which has energy storages on both AC side and DC side
Summary
Microgrid has become a widely accepted concept due to its high reliability and high flexibility. Microgrids that operate in grid-connected mode consider more about optimal management problems and optimal dispatching strategies because the voltage support and power balance can be realized by the utility grid. When the hybrid microgrid operates in the islanded mode, the BPCs must work as voltage sources to maintain the bus voltage for the subgrid that does not have storage system. Gu et al [17] designed a distributed control strategy which makes the overcharged storage exit voltage source mode and keeps one PV converter to regulate the bus voltage at the same time by changing. If the communication technology allows, the centralized secondary control is a good solution for SOC management problems [19] For those systems that have multiple storage systems in a subgrid, droop control is an effective way to share the active power [20].
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