Hybrid energy storage control system for stabilizing wind power fluctuation and control method

Abstract

The invention discloses a hybrid energy storage control system for stabilizing wind power fluctuation and a control method. The system comprises a power smooth acquisition unit and a hybrid energy storage coordination control unit. Wind power set power can be acquired by the power smooth acquisition unit in real time, the wind power set power is contrasted with a desired output power value of a wind power set, after amplitude limit processing, the wind power set power is sent to the hybrid energy storage coordination control unit, Karman adaptive low pass filtering is carried out by the hybrid energy storage coordination control unit according to a power deviation value to acquire a power output value of a wind power set, a first fuzzy controller is for adjusting time constant of a Karman low pass filter, correction on a power output value of the hybrid energy storage system is carried out by a second fuzzy controller after output power of the Karman low pass filter and energy storage cell state-of-charge SOC are acquired by the second fuzzy controller, after the amplitude limit stage, optimum power output is acquired by an energy storage cell and a super capacitor, so over-discharging and over-charging of the cell are avoided, and thereby safety operation of the energy storage system and the optimum wind power fluctuation stabilizing effect are realized.

Description

technical field [0001] The invention relates to a hybrid energy storage control system and control method for smoothing wind power fluctuations. Background technique [0002] With the large-scale integration of wind power into the grid, the impact of its power fluctuations on the grid is becoming more and more prominent. The energy storage system has the characteristics of quickly absorbing and releasing energy in a short time, which can effectively make up for the intermittent and fluctuating shortcomings of wind power output power. one of the effective means. [0003] Due to the high cost of energy storage systems, how to choose to maximize the economic value of energy storage systems while improving the service life of energy storage systems has become an urgent issue for wind power operators. The hybrid energy storage system can compensate the fluctuation component of a specific frequency band in the output power of the wind farm, so as to stabilize the fluctuation of ...

AI Technical Summary

Problems solved by technology

[0004] Existing wind power stabilization methods generally use a low-pass filter with a fixed time constant. When the characteristics of wind turbine power and energy storage system conditions change, the low-pass filter cannot actively adjust the filter time constant, thus failing to achieve optimal The smoothing effect of the wind power can not be considered comprehensively. The smoothing effect and the SOC of the battery state of charge and the safe working voltage of the super capacitor are important parameters of the battery energy storage system. These have a direct impact on the efficiency and life of the energy storage battery.

[0005] The patent "A Power Allocation Method for Micro-grid Hybrid Energy Storage System Based on Fuzzy Control Rules" proposes a power allocation method for micro-grid hybrid energy storage system based on fuzzy control rules for micro-grids, but does not consider the change rate of battery state of charge and storage capacity. Limiting processing in energy system power adjustment; the patent "A Fuzzy Control Method for Battery Energy Storage System to Suppress Wind Power Fluctuation" uses fuzzy control and combines the SOC of the energy storage system with low-pass filtering to control, but does not consider Due to constraints such as the state of charge of the battery and the safe working voltage of the supercapacitor, the charging and discharging power of the energy storage system needs to be dynamically adjusted optimally

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