A voltage stabilizing device and method based on a supercapacitor to stabilize a sudden change in DC bus voltage

Abstract

The invention discloses a voltage stabilizing device and method based on a supercapacitor to stabilize the sudden change of the DC bus voltage, including a detection circuit, a control circuit, a conversion circuit and a hybrid energy storage module. The detection circuit is connected to the DC bus through a voltage sensor and a current sensor. On the bus; the control circuit includes a central processing unit, and the central processing unit controls the on-off of the voltage compensation bus circuit and the capacitor charging circuit according to the detected voltage value on the DC bus; the conversion circuit adopts a bidirectional DC / DC Buck-Boost circuit , used to charge the hybrid energy storage module or make the hybrid energy storage module compensate the DC grid; the hybrid energy storage module includes a supercapacitor array and a battery array; the supercapacitor array consists of several unit supercapacitors connected in series and parallel The battery pack array is composed of several unit batteries connected in series and parallel. The invention can improve the power quality of the data center in the intelligent park, and ensure the stable voltage of the incoming line of the data center.

Description

technical field [0001] The invention belongs to the technical field of direct current power grids, and in particular relates to a voltage stabilizing device and a method for stabilizing a sudden change in the voltage of a direct current bus based on a supercapacitor. Background technique [0002] With the development of distributed power supply, DC microgrid is widely used as an efficient utilization system. A DC microgrid is generally composed of power modules such as multiple power supplies and constant power loads. When a distributed power supply or load is switched into a DC grid, it will cause a sudden change in the bus voltage, and because the distributed energy in the microgrid is easily affected by environmental factors , leading to the fluctuation and randomness of the output power, which further leads to sudden changes in voltage. There are two specific forms of voltage mutation: one is voltage drop, and the other is voltage overshoot. [0003] The data center is...

AI Technical Summary

Problems solved by technology

[0003] The data center is one of the typical loads in the smart park. When the bus voltage changes suddenly, it will pose a great threat to the safety of the data center equipment.

It may cause system oscillation, over-voltage or under-voltage protection malfunction, which may reduce the operating efficiency and life of the equipment in the data center, or cause a large number of switching power supplies used in the data center to stop running, and even burn the equipment in severe cases

[0004] In the existing technology, busbar voltage fluctuations can only be stabilized in the AC system. With the development of the DC distribution network, a bus voltage stabilization device for the DC distribution network is needed when the voltage of the DC distribution network suddenly changes. , to ensure the stable operation of the load

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