Abstract
In the case of islanding from the distribution network, problems such as source-load power loss under multi-zone island isolation will challenge the autonomous operation of multi-microgrids with three-phase/single-phase hybrid structure. In order to make full use of the resources in the multi-microgrids to realize the reliable and efficient operation of the system as a whole, this paper proposes a multi-time scale regional autonomous control strategy for multi-microgrids with three-phase/single-phase hybrid structure. The dynamic update islanding combination is controlled by the hourly dynamic island combination and the simultaneous search switching to achieve the overall resource allocation optimization. The source-storage-load power and state redistribution are dynamically realized through minute-level centralized coordination and optimization, so that the constraints of the three-phase unbalance are met and the source-load shedding are minimized. The power fluctuations of the sources and loads within each sub-microgrid are suppressed by using the second-level off-grid real-time power control. Moreover, the tie-line power can be maintained as the original given value and the three-phase unbalance degree index can be achieved. The multi-microgrids model with three-phase/single-phase hybrid structure based on DIgSILENT platform is used to verify the correctness and effectiveness of the proposed strategy.
Highlights
Along with the new urbanization and low-carbon energy transformation, microgrids can meet the growing demand for users and promote local consumption of renewable energy [1], [2]
Motivated by the aforementioned research gap, this paper proposes a multi-time scale regional autonomous control strategy for a single/three-phase hybrid structure multimicrogrids
CASE STUDIES AND DISCUSSIONS In order to verify the effectiveness of the proposed control strategy, the multi-microgrids with three-phase/single-phase hybrid structure presented in Fig. 9 are modeled based on DIgSILENT/PowerFactory platform
Summary
Along with the new urbanization and low-carbon energy transformation, microgrids can meet the growing demand for users and promote local consumption of renewable energy [1], [2]. The main contributions of this paper are highlighted as follows: 1) Proposing a multi-time scale regional autonomous control strategy suitable for the reliable and efficient operation of the multi-microgrids with three-phase/single-phase hybrid structure. 3) In the context of multi-microgrids with three-phase/ single-phase hybrid structure, the constraints of the threephase unbalance are considered and the source-load shedding are minimized in the proposed minute-level centralized coordination and optimization scheme. To avoid long-term and large-scale power deviation of the tie line, the sub-microgrid must adopt the PV-curtailing or load shedding measures to transfer the deviated real-time net load power to the generalized energy storage operation domain. To ensure the stability and reliability of the operation of the multi-microgrids system, and to achieve the optimal configuration of the overall resources, the dynamic islanding of the regional autonomous three-phase/single-phase hybrid multi-microgrids is performed through interconnection scheme decision. Step 8: Return to step 6 to perform weight comparison until U is merged into all nodes, and output TE as the search result
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