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Hybrid energy storage power station capacity determination method for stabilizing wind power fluctuations

A technology of wind power fluctuation and hybrid energy storage, which is applied in the direction of electric energy storage systems, electrical components, energy reserves, etc., and can solve the problems of high charge and discharge times, small output power variation range, and slow speed

Inactive Publication Date: 2014-07-16
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0004] VRLA is an energy-type energy storage device with small output power variation range, slow speed, few charge and discharge times, and low cost. It can be used to compensate for the trend component of wind power with gentle fluctuations and large energy; UC has frequent charge and discharge switching response capabilities , high charge and discharge times, suitable for smooth fluctuations of random components that exhibit frequent and rapid changes, and at the same time, the cost of UC is much more expensive than VRLA

Method used

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  • Hybrid energy storage power station capacity determination method for stabilizing wind power fluctuations
  • Hybrid energy storage power station capacity determination method for stabilizing wind power fluctuations
  • Hybrid energy storage power station capacity determination method for stabilizing wind power fluctuations

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Embodiment Construction

[0084] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0085] Let the wind turbine output power P at time t be W (t) and period reference output power P ref The difference P(t) of (t) is:

[0086] P(t)=P W (t)-P ref (t) (1)

[0087] At the same time, in order to further develop the characteristics of mixed media, the filter is used to decompose P(t) into high-frequency components P h (t) and trend component P l (t), and satisfy:

[0088] P(t)=P ΔH (t)+P ΔL (t) (2)

[0089] If P ΔH (t)>0, the energy storage power station UC is in the charging state at time t; otherwise, it is in the discharging state; similarly, if P ΔL (t)>0, the energy storage power station VRLA is in the charging state at time t; otherwise, it is in the discharging state. The charging and discharging process model in this paper is divided into the following situations from the operation target:

[0090] (1) Fully reduce the charge ...

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Abstract

The invention discloses a hybrid energy storage power station capacity determination method for stabilizing wind power fluctuations. The method comprises the steps that a hybrid energy storage power station charge-discharge process model is built with the goal of reducing storage battery charge-discharge frequency or reducing capacitance; a hybrid energy storage power station capacity optimized objective function is built with the goal of minimizing the sum of the building cost and the running cost of a hybrid energy storage power station; on the condition that the requirement of the hybrid energy storage power station charge-discharge process model is met, the PSO algorithm is adopted for solution and calculation of the hybrid energy storage power station capacity optimized objective function, and the optimal capacitance value of the hybrid energy storage power station is determined. According to the hybrid energy storage power station capacity determination method for stabilizing the wind power fluctuations, the hybrid energy storage power station is built based on a typical power type energy storage VRLA and an energy type energy storage UC, the charge-discharge process model with the complementary advantages is built by means of the features of the typical power type energy storage VRLA and the energy type energy storage UC, and coordinating and organic running of media of a hybrid energy storage system can be achieved; a capacity planning model is built with the goal of minimizing the running cost and the building cost of the energy storage power station, and the capacity is optimized.

Description

technical field [0001] The invention relates to the field of power fluctuation suppression, in particular to a method for determining the capacity of a hybrid energy storage power station for smoothing wind power fluctuations. Background technique [0002] As the penetration rate of renewable energy increases, its volatility poses a huge challenge to the safe and reliable operation of the power grid. Due to its characteristics of charging and discharging energy, energy storage power stations become an important way to smooth the power of renewable energy and overcome its volatility. One of the key problems in configuring energy storage in wind farms is how to coordinate and determine the energy storage capacity in the face of the constraint relationship between smoothing effect and input cost, so that the limited capacity can meet the effectiveness and economy of energy storage system operation at the same time. It can be seen that the capacity optimization of the energy st...

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Application Information

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IPC IPC(8): G06Q10/04G06Q50/06H02J15/00
CPCY02E70/30
Inventor 袁弘李建祥刘海波张秉良
Owner STATE GRID CORP OF CHINA
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