Non-parametric model prediction three-time control method for direct-current microgrid cluster

Abstract

The invention relates to the technical field of direct-current microgrid clusters, and concretely provides a non-parametric model prediction three-time control method for a direct-current microgrid cluster. A dynamic matrix control (DMC) algorithm is used as three times of control to carry out optimal scheduling on power of a plurality of interconnected direct-current microgrids. On the basis of adistributed control architecture and on the premise that the bus voltage is stable, accurate theoretical modeling does not need to be carried out on the direct-current microgrid control system, firstly, step response is carried out on a system, then response data are processed, and finally a DMC controller is designed to carry out three-time control on the cluster power. The loss of power devicesin the cluster is reduced, the communication pressure of the geographically adjacent direct-current microgrid cluster is reduced, the complexity of theoretical modeling of the direct-current microgrid model controller is reduced, and the algorithm is easy to implement.

Description

technical field [0001] The invention relates to the technical field of DC micro-grid clusters, in particular to a non-parametric model predictive tertiary control method for DC micro-grid clusters. Background technique [0002] DC microgrid has attracted much attention because it does not need to consider issues such as eddy current loss and reactive power compensation, and has advantages such as good power quality, high reliability, and simpler system management and control than AC microgrid. In order to achieve economic development and energy interoperability, DC microgrids are clustered and distributed in the form of interconnection. The document "Hierarchical Control for Multiple DC-MicrogridsClusters" IEEE Transactions on Energy Conversion (vol.29, no.4, pp.922-933) proposes a distributed hierarchical control architecture that communicates with adjacent networks through basic communication facilities , to ensure the reliable operation of DC microgrid clusters; in the d...

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Problems solved by technology

However, due to the large number of switching devices in the DC microgrid cluster, the cluster is nonlinear, and the traditional linear control is used to act on the nonlinear system. The control effect of this control strategy is not good, and the dynamic performance of the controller is poor. Reduced reliability; the document "Predictive Function Controller Design inTertiary Level for DC Microgrid Clusters" Electronics Letters, earlyaccess, 2020, Available: https: / / digital-ibrary.theiet.org / content / journals / 10.1049 / el.2020.0108, the paper proposes A predictive function control algorithm for three-time control of DC microgrid clusters. Although the power distribution and controller dynamics are optimized, the controller design and theoretical modeling are more complicated

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