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DC Current and Voltage Droop Control Method of Hybrid HVDC Systems for an Offshore Wind Farm Connection to Enhance AC Voltage Stability
IEEE Transactions on Energy Conversion ( IF 4.9 ) Pub Date : 2020-06-29 , DOI: 10.1109/tec.2020.3005777
Gyu-Sub Lee , Do-Hoon Kwon , Seung-Il Moon

A new DC current-voltage droop control method for a hybrid high-voltage direct-current (HVDC) system featuring a voltage-sourced converter (VSC) rectifier and a line-commutated converter (LCC) inverter is presented. The proposed method utilizes DC voltage droop control to reduce the AC voltage fluctuation at the inverter side, to exploit the hybrid HVDC system for connecting offshore wind farms to weak grids without necessitating continuous reactive power compensation facilities. Additionally, an optimal droop coefficient calculation method is proposed to keep the AC voltage constant for wind power fluctuations. To evaluate the stability of the proposed method, a small-signal state-space (SS) model of the target system is derived and the root locus analysis is given. Simulation case studies are performed using an electromagnetic transient model in PSCAD and an SS model in MATLAB. The results demonstrate that a hybrid HVDC system with the proposed method successfully integrates offshore wind energy and weak grids without additional facilities because the AC voltage can be maintained at a near constant during wind fluctuations.

中文翻译:

海上风力发电场混合高压直流输电系统的直流电流和电压降控制方法,以提高交流电压的稳定性

提出了一种用于混合高压直流(HVDC)系统的新型直流电流-电压下垂控制方法,该系统具有电压源转换器(VSC)整流器和线路换向转换器(LCC)逆变器。所提出的方法利用直流电压下降控制来减小逆变器侧的交流电压波动,从而利用混合HVDC系统将海上风电场连接到薄弱的电网,而无需连续的无功补偿设备。另外,提出了一种最优的下垂系数计算方法,以使交流电压在风力发电波动中保持恒定。为了评估该方法的稳定性,推导了目标系统的小信号状态空间(SS)模型并给出了根轨迹分析。使用PSCAD中的电磁瞬态模型和MATLAB中的SS模型进行仿真案例研究。结果表明,采用该方法的混合高压直流输电系统可以成功地将海上风能和弱电网集成在一起,而无需额外的设施,因为在风势波动期间交流电压可以保持接近恒定。
更新日期:2020-06-29
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