Voltage stabilizing device and method for stabilizing voltage jump of DC bus based on super capacitors

Abstract

The invention discloses a voltage stabilizing device and method for stabilizing voltage jump of a DC bus based on super capacitors. The voltage stabilizing device comprises a detection circuit, a control circuit, a conversion circuit, and a hybrid energy storage module. The detection circuit is connected to a DC bus through a voltage sensor and a current sensor. The control circuit comprises a central processing unit, and the central processing unit controls the on-off of a voltage compensation bus loop and a capacitor charging loop according to a detected voltage value on the DC bus. The conversion circuit adopts a bidirectional DC / DC Buck-Boost circuit and is used for charging the hybrid energy storage module or enabling the hybrid energy storage module to compensate a DC power grid. Thehybrid energy storage module comprises a super capacitor bank array and a storage battery pack array. The super capacitor bank array is composed of a plurality of unit super capacitors in a series-parallel connection mode, and the storage battery pack array is composed of a plurality of unit storage batteries in a series-parallel connection mode. The electric energy quality of a data center in anintelligent park can be improved, and the stability of the incoming line voltage of the data center can be ensured.

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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