Method and device for consistent discrete-time control of modularized microgrid power capacity

Abstract

The invention discloses a method and device for power capacity consistency discrete time controlling of a modular micro grid. Therefore, charging and discharging powers and capacities of storage batteries of a plurality of modules tend towards consistency to realize adjustment of balancing of active powers of the grid; the voltage and frequency fluctuation is reduced, the life cycle of the storagebattery is prolonged, and the power supply quality and reliability are improved; and the operating costs and maintenance of the micro grid are reduced and the economic optimization of the micro gridis realized. The method comprises: a proxy communication node carries out interaction of storage battery charging and discharging power information and capacity information through a sparse communication network; and with an energy conservation relationship among all component units in all modules in the modular micro grid and a power exchange energy conservation relationship between modules as constraint conditions, interaction powers of modules and a modular micro grid are set based on the obtained power information and capacity information within discrete time, so that charging and discharging powers and capacities of storage batteries of a plurality of modules in the modular micro grid tend towards consistency.

Description

technical field [0001] The invention relates to the technical field of micro-grids, in particular to a method and device for discrete-time control of power capacity consistency of modularized micro-grids. Background technique [0002] A microgrid is a small power generation and distribution system that organically integrates distributed power sources, loads, energy storage devices, converters, and monitoring and protection devices. Since the traditional microgrid has a common bus and hierarchical control structure, the structure and capacity expansion of the microgrid is very complicated and expensive. The modular microgrid consists of three-port converters, batteries, loads, wind and solar power generation units, and backup diesel generators. The modular microgrid is easy to expand, and through operation control and energy management, it can realize independent operation or interconnection of modules, reduce the adverse impact of intermittent distributed power on the distr...

AI Technical Summary

Problems solved by technology

However, when the existing modular microgrids are interconnected, the batteries in each module are in different charging and discharging states, and the energy fluctuations and impacts are large, which will not only shorten the battery life, but also reduce the power quality and power supply reliability. And lead to higher system maintenance and operating costs

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