All vanadium redox flow battery management method and system applied to scale energy storage

Abstract

The invention discloses an all vanadium redox flow battery management method and a system which are applied to scale energy storage. The system comprises an energy management system used for sending a charge instruction, issuing a charge power value PCharge, sending a discharge instruction and issuing a discharge power value PDischarge, a plurality of all vanadium redox flow battery subunits, a battery management system connected with the all vanadium redox flow battery subunits and used for detecting working states of the all vanadium redox flow battery subunits, a plurality of energy storage inverters connected with the all vanadium redox flow battery subunits respectively, and an in-situ monitoring system connected with the energy management system, the energy storage inverters and the battery management system respectively and comprising a judgment unit, a computing unit and a control unit. According to the method and the system, the service life of an all vanadium redox flow battery is prolonged, and charge states, the use frequency and the running time of the all vanadium redox flow battery subunits can be kept consistent conveniently.

Description

technical field [0001] The invention relates to a management method and system for an all-vanadium redox flow battery applied to large-scale energy storage. Background technique [0002] With the rapid development of renewable energy power generation, the scale of renewable energy power generation such as wind energy and solar energy is increasing year by year, but there are problems of instability and discontinuity, and it is necessary to equip power storage devices to achieve continuous and stable power output , so large-scale power energy storage devices have received great attention. Among many chemical energy storage technologies, all-vanadium redox flow batteries have gradually been widely used due to their advantages such as good charge and discharge performance, large capacity, long life, and high safety. Prospects, it is also increasingly used in wind power generation systems and solar photovoltaic systems to replace conventional batteries. To realize the normal ope...

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Problems solved by technology

[0002] With the rapid development of renewable energy power generation, the scale of renewable energy power generation such as wind energy and solar energy is increasing year by year, but there are problems of instability and discontinuity, and it is necessary to equip power storage devices to achieve continuous and stable power output , so large-scale power energy storage devices have received great attention. Among many chemical energy storage technologies, all-vanadium redox flow batteries have gradually been widely used due to their advantages such as good charge and discharge performance, large capacity, long life, and high safety. Prospects, it is also increasingly used in wind power generation systems and solar photovoltaic systems to replace conventional batteries. To realize the normal operation of the all-vanadium redox flow battery energy storage system, it needs to be effectively managed and controlled. The existing application scale The energy storage all-vanadium redox flow battery management method has the following problems: all battery packs or battery subunits participate in charging and discharging scheduling, and balance output at the same time, high operation and maintenance costs, and large system power consumption; The comparison of the real-time state of charge SOC value of the battery pack or battery subunit to select the optimal rechargeable battery pack or discharge battery pack, which does not balance the state of charge, use frequency and failure frequency of the all-vanadium redox flow battery, which affects the battery life. service life, and the power is usually evenly distributed during charge and discharge management, resulting in the imbalance of the state of charge of the all-vanadium redox flow battery

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