Energy storage station capacity optimizing calculation method considering dynamic adjustment of electrically charged state

Abstract

The invention discloses an energy storage station capacity optimizing calculation method considering dynamic adjustment of an electrically charged state. The optimizing calculation method includes the steps that a wind power plant energy storage system battery electrically charged state model is set up, and battery overcharging and overdischarging protective control is performed on the model; a wind power plant energy storage system capacity optimizing objective function is built with the optimal comprehensive benefit of stored energy as an objective, and energy storage station charging and discharging power constraint conditions and wind power plant output power fluctuation horizontal constraint conditions are built; the energy storage system capacity optimizing objective function is solved through calculation by selecting a PSO algorithm to determine the optimal wind power plant energy storage system capacity value. The energy storage station capacity optimizing calculation method has the advantages that energy storage station arrangement and overall economy in the operation process are considered comprehensively for the capacity optimizing calculation model, effective combination on site is facilitated, and theoretical premises and guarantees are provided for energy storage capacity optimization.

Description

technical field [0001] The invention relates to the field of power fluctuation stabilization, in particular to an energy storage power station capacity optimization calculation method considering the dynamic adjustment of the state of charge. Background technique [0002] As a renewable energy source, wind energy is being widely used all over the world. Due to the randomness, intermittent and uncontrollable characteristics of the wind, its output will have an impact on the stability of the grid voltage and power quality. In the face of the continuous growth of renewable energy such as wind energy, how to solve the impact of its output power fluctuations on the power grid has become an important issue facing the current power grid. Installing an energy storage system with a certain capacity and power in the wind farm can effectively smooth the fluctuation of wind power and improve the stability of the power system. However, the cost of energy storage system configuration an...

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Problems solved by technology

However, the cost of energy storage system configuration and the effect of stabilizing wind power fluctuations are mutually restrictive. Therefore, how to optimize the energy storage capacity to achieve the effectiveness and economy of stabilizing wind power fluctuations is an urgent problem to be solved at present.

[0003] In the optimal calculation of energy storage capacity, there are currently the following deficiencies: 1) The current research on energy storage systems that takes the state of charge of the energy storage system as a parameter is more reflected in the research on the level of energy storage control, while the research based on the state of charge and The optimal capacity planning of the economical energy storage system is seldom studied; 2) In the process of energy storage capacity optimization calculation, it is only considered to ensure the stable value of wind power for a long time to configure the capacity, or the wind turbine and storage The standard deviation of the output power fluctuation of the energy storage device is used as the index for optimization, or the minimization of the operating cost and investment cost is considered as the optimization goal, but the impact of insufficient charging and discharging power of the energy storage system or the state of overcharging and overdischarging on the smoothing of grid-connected power fluctuations is not taken as the target. Indexes in Energy Storage Capacity Optimization Calculation

[0005] In the traditional energy storage capacity optimization process, the state of charge of the energy storage system is not considered. The disadvantages are: First, due to the frequent overcharge and overdischarge of the energy storage system, or the abnormal working charge for a long time State, resulting in a greatly reduced service life, greatly increased the cost of the energy storage system, which is not conducive to economic considerations; second, the overcharge and overdischarge of the energy storage system makes it difficult to control the charging and discharging power, which will cause the power injected into the grid to appear. Severe fluctuations affect the stability of the power grid

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