Converter modular design and control method matched with battery grouping application

Abstract

The invention discloses a converter modular design and control method matched with battery grouping application. When power modules of a converter carry out grid-connected operations, independent constant power charge / discharge control of each power module can be realized through alternating current side active / reactive power decoupling by adopting grid voltage oriented vector control and voltage space vector pulse width modulation methods. When the converter operates, given N is the number of battery groups connected with the converter in parallel, and when the difference between the power instruction sent by the upper grid dispatcher and the rated power of the converter is greater than 1 / N of the rated power of the converter, the states of charges of the batter groups are taken as the power allocation basis and the operation strategy of timesharing rotation and dynamic dormancy is adopted. The method has the following effects that: the problem of circular current caused by direct parallel use of the batteries can be thoroughly solved; the system loss can be reduced and the efficiency and electric energy quality of the converter device can be improved; and the method has good generality, practicability and an application prospect.

Description

technical field [0001] The invention belongs to the technical field of converter design for large-capacity energy storage power stations, and is suitable for the modular design and control of converters matching the application of large-capacity batteries in groups. Background technique [0002] As the future development direction of my country's power grid, smart grid will carry out technical improvements on all aspects of power grid operation. Energy storage technology, especially large-scale battery energy storage technology, is an indispensable key content of the smart grid. Due to its own characteristics, it will be widely used in the four major links of power generation, power transmission, power distribution, and power consumption. In 2007, the State Grid Corporation of China put forward the framework of "Research on key technologies of energy conversion---research on key technologies of energy storage" and made careful deployment. Based on the research direction of ...

AI Technical Summary

Problems solved by technology

In the past battery applications, in order to meet the system requirements, batteries are often operated in parallel. Due to the differences in the differences and the complexity of the on-site environment, there will be uneven current and circulating current between the battery packs running in parallel, which will greatly damage the characteristics of the battery, resulting in a significant decline in the performance of the energy storage system.

Images