Design of high voltage grid-connected switch energy storage circuit control system

Abstract

The paper proposes and designs the control system of the high voltage grid-connected switch energy storage circuit based on ARM, in order to ensure the normal operation of the power system. In view of the problem that the high voltage grid-connected switch controlled by Lab-VIEW software currently takes a long time for spring energy storage and the system response speed is slow, which is not conducive to timely cutting off the fault source. The hollow current transformer and voltage transformer are used to collect the current signal and voltage signal on the main line of the power system respectively. Then the processed signal is input into the internal analog to digital conversion unit of the system microcontroller for analog to digital conversion, and the processed signal is calculated and judged logically by using the system microcontroller and the principle of three-point method measurement. If there is a defect in the energy storage circuit of the grid-connected switch, the corresponding defect treatment method shall be adopted according to the judgment result, and the electrical isolation switch circuit breaker control instruction signal shall be issued at the same time, and then the system drive circuit shall execute the protection action. At the same time, on this basis, the software structure of the system and the specific process of calculating and processing tasks are given. The results of system performance test show that the designed system can not only ensure the high voltage grid-connected switch to meet the mechanical properties and low voltage action characteristics, but also reduce the energy storage time of the spring, shorten the system reaction time, which is conducive to cutting off the fault source in time and avoiding the expansion of the accident range.