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Energy storage system internal power distribution method considering charging and discharging duration

A technology for duration and energy storage systems, applied in flexible AC transmission systems, reducing/preventing power oscillations, circuit devices, etc., can solve the problem of reducing the power output capacity of energy storage systems, large output power fluctuations, frequent charging and discharging switching, etc. problems, to achieve the effect of reducing the number of cycles, slowing down the loss of life, and prolonging the time of a single charge and discharge

Inactive Publication Date: 2020-11-17
ZHEJIANG ZHENENG TECHN RES INST
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Problems solved by technology

When the energy storage system is used in frequency modulation, auxiliary new energy power generation and other scenarios, the large output power fluctuations lead to frequent charging and discharging switching, which seriously affects the battery life
Most of the current energy storage system power distribution methods only consider the balance of the state of charge of the energy storage unit. The overall power output capability of the system

Method used

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  • Energy storage system internal power distribution method considering charging and discharging duration
  • Energy storage system internal power distribution method considering charging and discharging duration
  • Energy storage system internal power distribution method considering charging and discharging duration

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the examples. The description of the following examples is provided only to aid the understanding of the present invention. It should be pointed out that for those skilled in the art, some modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0040] As an example, a multi-unit large-scale energy storage system is established with a rated power of 15MW and a rated capacity of 30MWh to meet the power demand for auxiliary new energy generation control; the number of units n of the energy storage system is set to 10 , the initial SOC value is set as a set of random numbers; the upper and lower limits of the SOC of the energy storage unit are set to 90% and 10% respectively, and the parameter of the charge-discharge switchi...

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Abstract

The invention relates to an energy storage system internal power distribution method considering charging and discharging duration. The method comprises the following steps of S1, establishing a battery energy storage system power distribution basic optimization model; and S2, adding a dynamic constraint considering the charging and discharging duration in a scene with severe instruction fluctuation. The method has the beneficial effects that the charging and discharging state switching constraint based on the duration is added into the battery energy storage system power distribution basic optimization model, so that the cycle index of the battery is effectively reduced, and the service life of the energy storage system is prolonged; by adjusting the constraint conditions in the energy storage application scene with violent power fluctuation, the situation that the optimization model is solvable is ensured; energy storage power instructions are reasonably distributed in the multiple energy storage units, so that the operation state of the energy storage system is optimized, and the charging and discharging capacity of the energy storage system is maximized; the dynamic switching constraint based on the duration is designed, so that the single charging and discharging time of the energy storage battery is effectively prolonged, the service life loss of the energy storage systemis reduced, and the reliability of the power distribution control method is ensured.

Description

technical field [0001] The invention belongs to the field of power distribution, in particular to an internal power distribution method of an energy storage system considering the charging and discharging duration. Background technique [0002] An energy storage system usually consists of multiple energy storage units, and each energy storage unit is connected to a DC bus through a power converter (PowerConverter System, PCS), and the power of each unit is controllable. When the energy storage system is used in frequency modulation, auxiliary new energy power generation and other scenarios, the large output power fluctuations lead to frequent switching between charging and discharging, which seriously affects the battery life. Most of the current energy storage system power distribution methods only consider the balance of the state of charge of the energy storage unit. The overall power output capability of the system. Considering the fluctuation of power command in speci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/32H02J3/24
CPCH02J3/24H02J3/32H02J2203/20Y02E40/10
Inventor 马福元龚裕仲赵宇吴田成城江全元耿光超李熹宁吕力行许峰陈少华
Owner ZHEJIANG ZHENENG TECHN RES INST
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