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An Improved DC Voltage Droop Control for Interconnection of Wind Farms by VSC-MTDC

Haibo Zhang 1, Zhichang Yuan 1, Yuming Zhao 2, Guowei Liu 2, and Senjing Yao 2
1. Department of Electrical Engineering, Tsinghua University, Beijing, China
2. Shenzhen Power Supply Company, Guangdong Shenzhen, China
Abstract—According to the VSC-MTDC for interconnection of wind farms, an improved DC voltage droop control strategy was proposed. Under this control strategy, the system can automatically modify the power reference value on DC voltage –active power characteristic curve of the VSC station which was connected with the active AC network, realizing the translation of the droop curve. The strategy can ensure the rapid distribution of wind power variation, at the same time it can control the DC voltage within an allowable range. In addition, if the wind power remained stable over a period of time, the strategy can adjust the DC voltage back to the rated value. Finally, taking a typical five-terminal DC transmission system for example, simulation was processed with EMTDC/PSCAD to verify the correctness of the control strategy. The results show that the proposed strategy is suitable for interconnection by VSC-MTDC of wind farms whose flow changes frequently.

Index Terms—wind farms, voltage source converter (VSC), multi-terminal DC (MTDC), DC voltage droop control

Cite: Haibo Zhang, Zhichang Yuan, Yuming Zhao, Guowei Liu, and Senjing Yao, "An Improved DC Voltage Droop Control for Interconnection of Wind Farms by VSC-MTDC," Jounal of Automation and Control Engineering, Vol. 4, No. 2, pp. 127-131, April, 2016. doi: 10.12720/joace.4.2.127-131
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