A Control Method for Hybrid Energy Storage System to Suppress Power Fluctuation of Intermittent Power Supply

Abstract

The invention provides a control method of a hybrid energy storage system for stabilizing intermittent power fluctuation. According to the method, a power acquisition module is utilized to acquire the output power P of an intermittent power supply in real time. The method includes the specific steps that (1) the stabilized target power Pg (k) of the intermittent power supply is acquired; (2) the power magnitude and the SOC of the hybrid energy storage system are analyzed; (3) the output power P is stabilized according to the output power magnitude and the SOC of the energy storage system. Compared with the prior art, according to the control method of the hybrid energy storage system for stabilizing intermittent power fluctuation, power fluctuation can be simply and efficiently stabilized, and power generation stability and reliability of the intermittent power supply are improved.

Description

technical field [0001] The invention relates to a control method of a hybrid energy storage system, in particular to a control method of a hybrid energy storage system for smoothing intermittent power supply power fluctuations. Background technique [0002] The pressure from energy and the environment has led to more and more applications of renewable energy power generation. Renewable energy power generation has intermittent and random characteristics. Studies have shown that intermittent power sources such as grid-connected renewable energy have impacts and impacts on grid security, stability, and power quality. Therefore, through the self-regulation of the intermittent power supply, the parameters such as grid-connected power fluctuations can meet the grid-connected standards. However, the output power of the intermittent power supply presents obvious fluctuations, which brings certain challenges to the reliable and stable operation of the power system, and causes a seri...

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Problems solved by technology

[0004] Secondly, the method of using low-pass filter to decompose the power signal of intermittent power supply to obtain the target power and energy storage charging and discharging power has been widely adopted. Fluctuation method" Chinese patent application discloses a method for effectively smoothing the output power fluctuations of the wind and solar power generation system by optimizing the filtering time constant of the low-pass filter in real time, but the determination of the time constant of the low-pass filter in this method And optimization is mainly based on subjective experience, rather than starting from the detailed characteristics of the data itself and the specific performance characteristics of different types of energy storage systems, which has certain limitations

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