Hybrid energy storage system applied to micro-grid

Abstract

The invention discloses a hybrid energy storage system applied to a micro-grid. The hybrid energy storage system is characterized by being formed by a super-capacitor energy storage module, a storage battery energy storage module and an energy storage coordinating controller, and according to different operating states of the micro-grid, the hybrid energy storage system adjusts the control modes of the super-capacitor energy storage module, the storage battery energy storage module and the energy storage coordinating controller to meet operating needs of the micro-grid. In the grid-connected operation process of the micro-grid, the hybrid energy storage system has two control modes, according to the first control mode, the hybrid energy storage system receives power dispatch of a micro-grid energy management system, and according to the second control module, the hybrid energy storage system stabilizes output power of a public connecting point (PCC). In the isolated island operation process of the micro-grid, the hybrid energy storage system adopts the control mode of stabilizing voltage and frequency of the micro-grid. The hybrid energy storage system can meet the needs of the micro-grid in different operation states, and improve the power grade of the micro-grid.

Description

technical field [0001] The invention relates to a hybrid energy storage system applied to a microgrid, more specifically to the structural setting of the hybrid energy storage system and a control method for maintaining stable operation of the microgrid under various operating states of the microgrid. Background technique [0002] A typical microgrid consists of a variety of distributed power generation units, energy storage and loads, and a microgrid energy management system is responsible for the dispatching of power generation within the microgrid. Both wind energy and solar energy are intermittent, random, and uncontrollable. Therefore, the power output of distributed power generation units such as wind power generation and solar power generation in the microgrid is also volatile, which will affect the power quality and stability of the microgrid. Sex has a negative impact. Studies have shown that energy storage systems play a very important role in the stable control o...

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Problems solved by technology

However, this hybrid energy storage system only contains a bidirectional DC / AC converter and its PWM controller to control the total output of the hybrid energy storage. The control method is relatively simple and cannot meet the needs of various operating states of the microgrid; and a The output capacity of the bidirectional DC / AC converter is limited, and the power level of the hybrid energy storage system is low, which cannot meet the needs of a higher power level microgrid

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