Discharge balance control method and device for direct current microgrid system
A DC micro-grid and balance control technology, applied in the field of power grids, can solve problems such as the inability to balance energy storage battery packs and affect the life and reliability of energy storage units, so as to improve life, reduce charge and discharge times, and improve reliability and stability sexual effect
Pending Publication Date: 2018-08-28
北京群菱能源科技有限公司
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[0006] However, the current battery management system (Battery management system, referred to as: BMS) based on droop control can only balance the discharge of each energy storage battery in a single energy storage battery pack, and cannot balance between different energy storage battery packs. Over time, it will greatly affect the life and reliability of the energy storage unit
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[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0022] figure 1 A schematic flow chart of the DC microgrid system discharge balance control method provided by the embodiment of the present invention, as shown in figure 1 As shown, the method includes:
[0023] Step S11, obtaining the state of charge information of each energy storage battery pack in the energy storage unit;
[0024] Step S12...
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The invention provides a discharge balance control method and device for a direct current microgrid system. The method comprises the following steps of acquiring charge state information of each energy storage battery pack in an energy storage unit; computing a discharge balance coefficient of each energy storage battery pack according to the charge state information; and computing output voltageof each energy storage battery pack according to the discharge balance coefficient and the charge state information. According to the discharge balance control method and device for the direct currentmicrogrid system, the output voltage of each energy storage battery pack is computed according to the charge state information and the discharge balance coefficient of the energy storage battery pack, so that the energy storage battery pack with a high electric charge state information value can output larger current, the energy storage battery pack with the low charge state information value canoutput smaller current, the charge and discharge frequency of some batteries in the direct current microgrid system is reduced, and the service life of the energy storage battery pack is prolonged, and the direct current microgrid system reaches a discharge balance state, and thus the reliability and the stability of a direct current microgrid are improved.
Description
technical field [0001] The invention relates to the technical field of power grids, in particular to a discharge balance control method and device for a DC micro-grid system. Background technique [0002] With the gradual popularity of the microgrid concept, the cases and reliability of power system applications in remote areas and power islands continue to increase. Among them, the microgrid is currently divided into two categories: DC microgrid and AC microgrid, and two types of hybrid. Due to the lack of synchronization, reactive power and harmonic requirements, the efficiency of DC microgrid is significantly higher than that of AC microgrid, so it has attracted research attention at home and abroad. [0003] The current bidirectional DC converter (DC / DC converter) mainly uses three control strategies to connect to the DC micro-grid bus, including constant voltage and constant power, V / F control, and droop control. Since there are two modes of grid-connected and off-gri...
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IPC IPC(8): H02J1/14H02J7/34
CPCH02J1/14H02J7/34
Inventor 姚海强姚承勇张进滨
Owner 北京群菱能源科技有限公司