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| Stability Control for Improving the Characteristic of Wind Farm Injection Current During Low Voltage Ride-Through Using Energy Storage System |
| Liu Ju1, Yao Wei1, Hou Yunhe2, Wen Jinyu1, Chen Xia1 |
1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China;
2. Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong 999077 China |
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Abstract According to the grid codes, wind farms must inject reactive power current into power grid during the low voltage ride-through (LVRT) process. This would lead to instability of the wind power system and the LVRT failure of wind farm. A state space model of wind power system including the phase locked loop at the low voltage state was established in this paper, to analyze the instability phenomenon. Then the reasons of the instability phenomenon were well revealed. Finally, a stability control strategy was proposed to improve the stability of the wind power system by utilizing the energy storage system. Simulation results show that the state model of the wind power system at low voltage state can represent the small disturbance stability characteristic of the system. The energy storage system could effectively improve the injection current feature of wind power system and accordingly improve the system stability.
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Received: 18 December 2015
Published: 28 July 2016
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2016, Vol. 31 
