Coordination control method for common direct current bus mixing energy storage systems

Abstract

The invention provides a coordination control method for common direct current bus mixing energy storage systems. The method includes the steps of building topological structures of the mixing energy storage systems, coordinately controlling different types of the energy storage systems by means of a direct current (DC) / DC converter control mode normalization model, and coordinately controlling the energy storage systems in the same type and with different capacity. According to the coordination control method for the common direct current bus mixing energy storage systems, by means of coordinate control for a lithium battery energy storage system and a super capacitor energy storage system, reasonable utilization of the different types of energy storage systems is realized, and therefore, the response speed of the systems is improved, service life of the energy-type energy storage systems is prolonged, and technical performance and economical performance of the whole system are improved.

Description

technical field [0001] The invention belongs to the technical field of micro-grid operation and control, and in particular relates to a coordinated control method for a hybrid energy storage system with a common DC bus. Background technique [0002] In a distributed renewable energy generation system with an energy storage system, batteries are usually used as energy storage components. However, as energy storage components, batteries have disadvantages such as low power density and the number of charge and discharge cycles affecting their service life. As a power energy storage element, supercapacitors are receiving more and more attention due to their advantages such as high power density, long cycle life, high charge and discharge efficiency, and no maintenance. However, due to their low energy density, it is still difficult to Realize large-capacity electric energy storage. The mixed use of batteries and supercapacitors is applied to renewable energy power generation sy...

AI Technical Summary

Problems solved by technology

In order to obtain a stable DC bus voltage, some literature proposes a hybrid energy storage structure in which a supercapacitor is connected in parallel with a battery pack through a DC / DC converter. Although the DC bus voltage is relatively stable during power fluctuations, this structure cannot be achieved. The flexible management of the input and output energy of the battery pack cannot give full play to the role of various types of energy storage devices

[0007] For the coordinated control between energy storage devices of the same type and different capacities, the current communication system is mainly used to carry out current sharing control among various energy storage modules, but communication is used between multiple DC / DC control modules that use voltage control. Current sharing control has the disadvantages that the communication range is limited by geographical location, and the reliability and redundancy of the system are low; at present, research on the coordinated control between DC / DC converters in the multi-voltage control mode without communication lines less

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