Economic and stability optimization method of microgrid considering the randomness of renewable energy

Abstract

The present invention provides a microgrid economy and stability optimization method considering renewable energy source randomness. The method comprises the following steps: the step 1: performing output prediction of renewable energy source power; the step 2, establishing a microgrid economy optimization model; the step 3, establishing a microgrid stability evaluation index system; the step 4, determining a microgrid active power control strategy; and the step 5, performing coordination optimization of the microgrid economy and stability. Based on a droop control method, the microgrid economy and stability optimization method considering the renewable energy source randomness improves the isolated study of microgrid economy and stability in the prior art, effectively combines the microgrid economy and stability study, is suitable for changing of different operation modes, and performs optimization solution of droop coefficients through a differential evolution algorithm to realize good dynamic stability of the microgrid while good economy of the microgrid, and the established model method is reasonable and efficient.

Description

technical field [0001] The invention relates to the field of coordinated optimization of micro-grid economy and stability, in particular to a micro-grid economy and stability optimization method considering the randomness of renewable energy. Background technique [0002] With the gradual increase in the penetration rate of distributed power sources, the randomness and uncertainty of renewable energy generation such as wind power and photovoltaic power generation not only bring challenges to the economic dispatch of microgrids, but also increase the stability of microgrids. risks of. Whether the microgrid can operate stably requires not only solving the problem of how to maintain the stability of the island operation, but also ensuring stable operation in various dynamic processes such as grid-connected to isolated grid, and drastic changes in the operation mode of the microgrid. Therefore, under the premise of uncertain renewable energy output, how to consider the drastic ...

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Problems solved by technology

[0004] Aiming at the problem that micro-grid economic optimization and stability research cannot be carried out in isolation, the present invention provides a micro-grid economic and stability optimization method that considers the randomness of renewable energy, and realizes it through droop control without increasing the cost of additional devices Stable and Optimal Operation of Microgrid Economy

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