Multi-time-scale microgrid hierarchical stability control method

Abstract

The invention relates to a multi-time scale micro-grid layered stability control method. Combined control of three time scale levels, namely the minute level, the second level and the millisecond level, is constructed; second-level dispatching and millisecond-level dispatching are performed on the basis of minute-level dispatching; the objective of the minute-level dispatching is the minimum operation cost of a micro-grid, the objective of the second-level dispatching is the stable operation of the micro-grid, and the objective of the millisecond-level dispatching is the instantaneous power balance of the micro-grid in an isolated grid state. The method achieves comprehensive regulation of distributed power, energy storing devices, public grid exchange power and load switching in micro-grid systems and reasonable distribution control to the distributed power, the energy storing devices and the public grid exchange power, thereby improving the instantaneity of power balance, remarkably improving the accuracy of stability control of micro-grids and achieving low-cost operation of micro-grid systems.

Description

technical field [0001] The invention relates to a method for stabilizing a microgrid system and belongs to the technical field of microgrid stabilizing control. Background technique [0002] Microgrid is an autonomous system capable of self-control, protection and management. It can be operated in parallel with the large grid or isolated. The stable operation of the microgrid is the prerequisite for the safe, reliable operation and benefit of the microgrid. The microgrid must be grid-connected and connected, the isolated grid is stable, the isolation is fast enough, seamless switching, and the plug-and-play of the microgrid can be truly realized in order to give full play to its benefits. [0003] However, due to the small inertia of the microgrid system, large fluctuations in distributed power sources and loads, and the characteristics of intermittent and poor controllability of distributed power generation power sources, and there are problems such as flexible and changea...

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Problems solved by technology

[0003] However, due to the small inertia of the microgrid system, large fluctuations in distributed power sources and loads, and the characteristics of intermittent and poor controllability of distributed power generation power sources, and there are problems such as flexible and changeable network structures and large changes in user loads, therefore, Ensuring the safe, stable and economical operation of the micro-grid is the key and difficulty in popularizing and applying the micro-grid

The existing microgrid stability control methods usually only focus on the stable or economical operation of the microgrid system, but are still lacking in how to comprehensively realize the stable and economical operation of the microgrid system.

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