Long-time charging and discharging battery energy storage device and control method
A battery energy storage, charging and discharging technology, applied in the field of electrochemical energy storage, can solve the problems of high cost, hidden dangers of battery pack operation, difficulty in bearing short-circuit current, etc., and achieve the effect of low cost
Active Publication Date: 2021-03-30
POWERCHINA HUADONG ENG COPORATION LTD
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Problems solved by technology
However, for the daily grid operation conditions, a ratio of 1MW / 8MWh and above is required to meet the requirements. However, since the mature and reliable capacity of a single bidirectional inverter is 500kW, it needs to be matched with a 4MWh battery pack. However, a single battery When the group size exceeds 3MWh, the DC bus short-circuit current of the battery group will be as high as 150kA or more. Neither the DC circuit breaker nor the fuse can withstand the short-circuit current, and there will be serious hidden dangers in the operation of the battery group.
However, if a 250kW bidirectional inverter is used to match a 2MWh battery pack, the number of battery packs-bidirectional inverters will be doubled and the cost will be high
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[0013] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein like or similar reference numerals designate like or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0014] Refer to attached picture. A long-time charging and discharging battery energy storage device provided by the present invention includes 1# storage battery pack 1, 2# storage battery pack 2, bidirectional current conversion device 3, and connecting conductors 41, 42, 43, 444. The 1# battery pack 1 includes several batteries 11, and the batteries 11 of the 1# battery pack 1 are respectively connected to the DC bus 13 of the 1# battery pack 1, and a circuit breaker 12 is set on the connecting circuit. Similarly, the 2# battery pack...
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The invention provides a long-time charging and discharging battery energy storage device and a control method. The long-time charging and discharging battery energy storage device comprises a 1 # storage battery pack, a 2 # storage battery pack, a bidirectional converter device and a connecting conductor. The storage batteries of the 1 # storage battery pack are respectively connected to the direct-current bus of the 1 # storage battery pack, and a circuit breaker is arranged on a connecting circuit; the 2 # storage battery pack comprises a plurality of storage batteries, the storage batteries of the 2 # storage battery pack are respectively connected to a direct current bus of the 2 # storage battery pack, and a circuit breaker is arranged on a connecting circuit; the bidirectional converter device comprises a 1 # positive electrode full-control power switch, a 2 # positive electrode full-control power switch, a 1 # negative electrode full-control power switch, a 2 # negative electrode full-control power switch and a bidirectional inverter. And the bidirectional inverter is connected to a power distribution network in an alternating-current measurement manner. According to the invention, the power / capacity ratio of the energy storage battery can reach more than 1MW / 8MWh under the condition of not increasing the direct-current side short-circuit current and the number of the bidirectional inverters, and long-time charging and discharging are met.
Description
technical field [0001] The invention relates to the field of electrochemical energy storage, in particular to a long-time charging and discharging battery energy storage device and a control method. Background technique [0002] Through the rapid storage and release of electric energy, energy storage power stations can not only participate in system peak regulation and frequency regulation, stabilize new energy fluctuations, reduce the rate of curtailment of wind and solar, but also play a significant role in improving the emergency control capability of the power grid. At present, the power and energy configuration ratio of energy storage is usually between 2MW / 1MWh and 1MW / 4MWh. However, for the daily grid operation conditions, a ratio of 1MW / 8MWh and above is required to meet the requirements. However, since the mature and reliable capacity of a single bidirectional inverter is 500kW, it needs to be matched with a 4MWh battery pack. However, a single battery When the gro...
Claims
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IPC IPC(8): H02J3/32H02M7/797
CPCH02J3/32H02M7/797
Inventor 任洪涛陈建锋郑珊珊
Owner POWERCHINA HUADONG ENG COPORATION LTD