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摘要
In a micro-grid group consisting of Microgrid (MGs) owned by different separate entities, there are differences in the operating goals, frequency modulation resources or capabilities of each MG. There is a requirement for the orderly sharing of frequency modulation tasks and cost fee, and for the orderly achievement of frequency modulation economic efficiency. The reserve capacity allocation rules for an islanded micro-grid group are analyzed and a strategy of hierarchical coordination control for frequency adjustment of the micro-grid group is proposed in this paper. In the first layer, the Micro-Grid Central Controller (MGCC) conducts economical frequency modulation based on Tie-line Load Frequency Bias Control (TBC), undertaking the frequency modulation tasks caused by the power change of the MG itself, to restore the system frequency, and eliminate the tie-line exchange power errors. In the case of an inadequacy of the frequency adjustment of the MG, a frequency adjustment auxiliary service is delivered to the upper Micro-Grid Group Central Controller (MGGCC). In the second layer, the MGGCC conducts an economical frequency modulation based on constant-frequency control FFC in the micro-grid group to restore the system frequency. This strategy can achieve the orderliness and economic efficiency of the frequency adjustment of the micro-grid group owned by separate entities. In the process of frequency layered adjustment, each MG undertakes the frequency modulation costs caused by the power change of the MG itself, including self-adjustment and mutual adjustment costs. Numerical results show the effectiveness of the control strategy. This strategy can provide a reference for the design, networking, operation and control of a micro-grid group.
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