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Hybrid energy storage control method for stabilizing intermittent power supply power fluctuation

A hybrid energy storage and power supply technology, applied in the direction of reducing/preventing power oscillation, AC network load balancing, etc., can solve the problem of high charge and discharge times, achieve stable power fluctuations, improve life shortening problems, and reduce charge and discharge times Effect

Inactive Publication Date: 2015-01-21
SOUTHEAST UNIV
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Problems solved by technology

The traditional method is to use a single battery energy storage element to stabilize the system power, but due to the impact of frequent charging and discharging on the life of the battery pack and the single energy storage element often cannot meet the needs of system power stabilization, the present invention combines the battery and super Capacitors complement each other to form a hybrid energy storage system to enhance the power regulation capability of the energy storage system. Using the characteristics of high power density and high charge and discharge times of super capacitors, the power fluctuations are prioritized, and the subsequent adjustment of the battery pack is used to maintain the voltage of the super capacitor at the limit. within

Method used

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  • Hybrid energy storage control method for stabilizing intermittent power supply power fluctuation
  • Hybrid energy storage control method for stabilizing intermittent power supply power fluctuation
  • Hybrid energy storage control method for stabilizing intermittent power supply power fluctuation

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] Such as figure 1Shown is a stabilization system based on hybrid energy storage, a hybrid energy storage control method that stabilizes intermittent power fluctuations. The hybrid energy storage is composed of a battery pack and a super capacitor, and the battery pack is divided into two independently controlled battery groups. , each battery group includes more than one battery, and the two groups of battery groups are called the first battery group and the second battery group; Connected to the DC bus of the hybrid energy storage to realize the bidirectional control of the supercapacitor, the first battery pack and the second battery pack; the DC bus of the hybrid energy storage is connected to the public grid through a DC / AC converter, intermittent DG (Distributed Generation, distributed generator) is connected to the public grid through a DC / AC converter; th...

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Abstract

The invention discloses a hybrid energy storage control method for stabilizing intermittent power supply power fluctuation. According to the method, a super capacitor with large power density and high dynamic response speed is adopted as system buffer stored energy for preferentially stabilizing the power fluctuation, and the voltage of the super capacitor is prevented from being out of limit by adjusting the power of a storage battery set. The storage battery set is divided into a charge set and a discharge set which are independent and are controlled respectively, and the circulating charge and discharge frequency of the storage battery set is reduced to the maximum extent. Based on the mutual adjustment rule of the charge set and the discharge set of the storage battery set of a charge state, the storage battery set is prevented from being deeply charged or discharged, and the service life of the storage battery set is prolonged.

Description

technical field [0001] The invention relates to a hybrid energy storage control method for stabilizing intermittent power fluctuations, which belongs to the micro-grid energy storage technology. Background technique [0002] Due to the large fluctuations and strong randomness of the output power of intermittent power sources such as wind power and photovoltaics, energy storage devices are needed in the microgrid to stabilize the power fluctuations caused by intermittent power sources. The traditional method is to use a single battery energy storage element to stabilize the system power, but due to the impact of frequent charging and discharging on the life of the battery pack and the single energy storage element often cannot meet the needs of system power stabilization, the present invention combines the battery and super Capacitors complement each other to form a hybrid energy storage system to enhance the power regulation capability of the energy storage system. Using the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/32
CPCH02J3/32H02J3/24
Inventor 郑建勇梅军张宸宇周福举胡洛瑄邓凯
Owner SOUTHEAST UNIV
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