Abstract
In the last several years, the coordination control of hybrid AC/DC microgrids (HMGs) has been gaining increasingly more attention. However, most of these discussions are focused on single-bus HMGs whose AC or DC bus is not sectionalized by AC or DC breakers. Compared with these single-bus HMGs, the bus-sectionalized HMG has more flexible topologies, more diverse operation modes, and consequently higher service reliability. However, meanwhile, these benefits also bring challenges to the stable operation of bus-sectionalized HMGs, particularly for mode switching. Relying on the national HMG demonstrative project in Shaoxing, China, this paper makes efforts to present the hierarchical control paradigm of a typical bus-sectionalized HMG toward standardization. The test results demonstrate that the proposed system provides seamless switching and uninterrupted power supply without controller reconfiguration among different operation modes. The operational data are also brought forth and analyzed to provide significant and useful experiences for designing and developing similar HMGs in the future.
Highlights
Hybrid AC/DC microgrids (HMGs) are expected to be the key component of the future distribution networks [1], which play an important role in the integration of AC or DC distributed renewable resources, the flexible access of DC loads, as well as the highly reliable power supply
If the DC breaker is opened from the AC-bus sectionalized mode, or the AC breaker is opened from the DC-bus sectionalized mode, the BSHMG is switched to the islanded mode
The proposed standardization-oriented hierarchical control strategy is practically applied to the demonstration project of a bus-sectionalized hybrid AC/DC microgrid in Shaoxing, Zhejiang Province, China
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Wang et al suggested a nonlinear disturbance observer (NDO)-based DC bus voltage control, which is developed to suppress the transient fluctuations of the DC bus voltage and improve the power quality in the HMG system [11] Both of the schemes in [10,11] do not include the mode transition algorithms, and the operation mode of the interlinking converters are fixed. A coordinated hierarchical control fashion is proposed to achieve the stable multimode operation and seamless mode transition in this BSHMG.
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