State of charge-based hybrid energy storage hierarchical coordination control method

A hybrid energy storage and state-of-charge technology, which is used in current collectors, electric vehicles, electrical components, etc., can solve the problems of overcharging and over-discharging of equipment, without considering the state of charge of energy storage equipment, and prevent overcharging or overcharging. Effect of discharge phenomenon, prolonging life and ensuring safety

Active Publication Date: 2016-12-07
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
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Problems solved by technology

ASAO T proposes to use a low-pass filter method to compensate specific frequency band components in wind power, but because the state of charge (SOC) of the energy storage device is not considered, it is easy to cause overcharging and overdischarging of the equipment

Method used

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  • State of charge-based hybrid energy storage hierarchical coordination control method
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  • State of charge-based hybrid energy storage hierarchical coordination control method

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Embodiment

[0038] A state-of-charge-based hierarchical coordinated control method for hybrid energy storage, which is used for the control of microgrids with hybrid energy storage units, such as figure 1 Shown is a structural block diagram of a microgrid welded with a hybrid energy storage unit. The hybrid energy storage unit includes a battery 1 and a supercapacitor 2. The battery 1 and supercapacitor 2 are respectively connected to the DC bus through a DC / DC converter, that is, the first one in the figure. The DC / DC converter 3 and the second DC / DC converter 4 are connected to the DC bus of the microgrid through the DC / AC converter 5, and the storage battery 1 is a lithium iron phosphate battery.

[0039] The hybrid energy storage hierarchical coordination control method based on the state of charge of the present invention includes the following steps:

[0040] (1) Obtain the microgrid AC bus voltage U, AC bus frequency f and hybrid energy storage unit comprehensive state of charge SO...

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Abstract

The invention relates to a state of charge-based hybrid energy storage hierarchical coordination control method, which is used for control of a micro-grid comprising a hybrid energy storage unit. The hybrid energy storage unit comprises a storage battery and a supercapacitor that are connected to a direct-current bus through DC/DC converters respectively; and the direct-current bus is connected to an alternating-current bus of the micro-grid through a DC/AC converter. The method comprises the following steps of obtaining a voltage of the alternating-current bus of the micro-grid, a frequency of the alternating-current bus and a comprehensive state of charge of the hybrid energy storage unit, performing upper-layer power optimization control, obtaining a output power instruction of the DC/AC converter, and controlling the DC/AC converter to work; and obtaining a voltage of the direct-current bus, performing lower-layer power allocation by taking the stable voltage of the direct-current bus as a target, obtaining charging-discharging power instructions of the storage battery and the supercapacitor, and controlling the corresponding DC/DC converter to work. Compared with the prior art, the method has the advantage that overcharging or overdischarging of a hybrid energy storage battery can be effectively prevented.

Description

technical field [0001] The invention relates to a hybrid energy storage control method, in particular to a state-of-charge-based hierarchical coordination control method for hybrid energy storage. Background technique [0002] In recent years, with the rapid development of renewable energy, people have put forward higher requirements for the reliability and stability of microgrids. In order to improve the power balance, stability, and power quality in the microgrid system, it is one of the effective means to suppress power pulsation to equip an energy storage device with a more stable output power. The energy storage system has the ability to quickly absorb and release power in a short time Therefore, it can effectively overcome the shortcomings of intermittent and fluctuating output power of renewable energy. In order to make up for the shortcomings of traditional single energy storage equipment, hybrid energy storage units using power-type supercapacitors and energy-type ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/28H02J3/32H02J7/34
CPCH02J3/28H02J3/32H02J7/34H02J7/345
Inventor 李辉黄瑶妹彭道刚夏飞马飞
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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