Isolated island micro-grid layered distribution type control strategy based on consistency theory

Abstract

The invention provides an isolated island micro-grid layered distribution type control strategy based on a consistency theory. The isolated island micro-grid layered distribution type control strategycomprises the steps: firstly, a primary droop control strategy is proposed, a distribution type multi-loop controller based on droop control is designed and comprises an outer loop power controller and an inner loop voltage and current controller, distribution type power supply quick response is achieved, and the system voltage and frequency are stabilized; then based on a finite time consistencyalgorithm, a translational droop curve method and a voltage-reactive droop coefficient correcting method, distribution type secondary frequency control and secondary voltage-reactive control strategies are proposed, frequency and voltage deviations caused by primary droop control are corrected, and reactive power proportional distribution is achieved; and finally, an economic dispatching model isbuilt by considering the optimal total power generating cost of a micro-grid system as a target, solving is carried out by adopting a Lagrangian dual decomposition method, an isolated island micro-grid distribution type economic dispatching method is further proposed based on the finite time consistency algorithm, and thus the optimal output active power of all distribution type power supplies isindependently solved locally.

Description

technical field [0001] The invention relates to the technical field of micro-grid control, in particular to a layered distributed control method for an isolated island micro-grid. Background technique [0002] With the continuous improvement of users' attention to power supply reliability and power quality, and the extensive use of various forms of renewable energy such as solar energy and wind energy, distributed power generation (Distributed Generator, DG) is due to its full use of abundant clean and renewable energy in various places. Energy has been vigorously developed. As a small power generation and distribution system composed of DG, energy storage device, energy conversion device, controllable load and monitoring, protection device and other units, microgrid can realize self-control, protection and management, and is recognized as a solution to distributed power generation. The most efficient solution for accessing the distribution network. In particular, in the i...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, provide a hierarchical distributed coordination control strategy, and solve the problem of voltage and frequency control in an island microgrid with distributed power sources. This method not only improves the efficiency of the island microgrid system Safe, stable and economical operation level, and does not require a central controller, which can effectively solve the defects of poor reliability and low robustness of centralized control methods

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