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Lv Pin,Zhai Yuelin,Su Xunwen,Xu Donghui,Liu Lulu,Liu Ziyang 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.6
With the increasing share of renewable energy such as wind energy in power system, flexible DC transmission technology has become an important way to effectively absorb wind energy. But the problem of synchronous sub-synchronous oscillation becomes more and more serious. To reduce the influence of sub-synchronous oscillation on interconnected systems, a Controller for energy conversion system is proposed. It is used to control the synchronous operation of the doubly-fed fan and the rectifier station to connect the doubly-fed wind farm. First, based on the impedance method, a doubly-fed wind farm and multi-module impedance model considering AC/DC dynamic coupling are established. The control energy conversion of wind power generation system, rectifier station and inverter station is designed. Second, according to Nyquist curve and impedance stability criterion, the change of system stability in the process of adjusting controller parameters is observed. Third, the system structure is simulated by MATLAB software. The effectiveness of the controller in the converter station at both ends of MMC is verified. The results show that the new controller can effectively suppress the current offset caused by SSO, and thus improve the power system stability.
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Appraisal of VSC based MTDC System Topologies for Offshore Wind Farms
A. Ali Raza,B. Xu Diangou,C. Su Xunwen,D. Li Weixing 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
Topologies of VSC based MTDC system has been reconnoitered. A Novel two wind farms and one platform (2WF-1PF) topology has been proposed. MTDC link topologies have been analyzed and likened based on techno-economic criteria’s: number of HVDC circuit breakers, length and capacity of HVDC circuits, number of offshore and onshore platforms, flexibility, redundancy and utilization of HVDC links. Technical analysis proved that 2WF-1PF is promising topology and shows economic feasibility for future HVDC grids.
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