Abstract
This paper proposes a coordinated control of wind turbine and energy storage system (ESS). Because wind power (WP) is highly dependent on variable wind speed and could induce a severe stability problem to power system especially when the WP has high penetration level. To solve this problem, many power generation corporations or grid operators recently use the ESS. It has very quick response and good performance for reducing the impact of WP fluctuation but has high cost for its installation. Therefore, it is very important to design the control algorithm considering both ESS capacity and grid reliability. Thus, we propose the control algorithm to mitigate the WP fluctuation by using the coordinated control between wind turbine and ESS considering ESS state of charge (SoC) and the WP fluctuation. From deloaded control according to WP fluctuation and ESS SoC management, we can expect the ESS lifespan expansion and improved grid reliability. The effectiveness of the proposed method is validated in MATLAB/Simulink considering power system including both wind turbine generator and conventional generators which react to system frequency deviation.
Highlights
Wind power (WP) is incorporated in power system, and its proportion among the total power production continues to grow
A small power system was investigated using the governors and automatic generation control (AGC) to evaluate the impact of wind power (WP) fluctuation on the power system frequency
We considered the specific cases when the WP fluctuation suddenly increased from 0.1 to 0.5 with different average wind speeds (i.e., 10, 13 m/s)
Summary
Wind power (WP) is incorporated in power system, and its proportion among the total power production continues to grow. The other method [18] consider the SoC management and introduced a method that divides the different control region for the ESS In this method, ESS takes all the responsibility for mitigating WP fluctuation, without any action from a WT, which can result in the capacity-related problems of the ESS and reduce its lifespan. Another method that uses a dual-layer control scheme was introduced for reducing the WP fluctuation and managing the SoC of the ESS [19] This method fully depends on the ESS behavior for mitigating wind power fluctuation. The reliability of the power system can be improved and the ESS can be used more effectively by changing the power production level to a slightly lower point for the de-loaded operation. In terms of mitigation of a WP fluctuation, we propose the lower rotor speed de-loaded operation and illustrated the reasons and the results obtained from the method
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