Coordinated voltage control in offshore HVDC connected cluster of wind power plants
Coordinated voltage control in offshore HVDC connected cluster of wind power plants
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DOI：
10.1109/tste.2016.2569430
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发表时间：
2016-05
期刊：
影响因子：
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通讯作者：
J. Sakamuri;Z. Rather;Johan Rimez;M. Altin;O. Goksu;N. Cutululis
中科院分区：
文献类型：
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作者：
J. Sakamuri;Z. Rather;Johan Rimez;M. Altin;O. Goksu;N. Cutululis
提出了一种基于电压源换流器的高压直流系统的海上风力发电机组群的协调电压控制方案。所提出的电压控制方案的主要控制点是引入的Pilot总线，其在海上交流电网中具有最高的短路容量。所开发的CVCS采用优化算法，以海上电网有功损耗最小为目标，为Pilot总线生成电压参考。在稳态操作期间，通过基于风力发电厂集群中的每个风力涡轮机（WT）的可用无功功率裕度和基于网络灵敏度的参与因子将无功功率参考分派给WT来控制引导总线电压，所述参与因子从WT总线w.r. t的dV/dQ灵敏度导出。飞行员巴士该方法通过调度与更靠近变电站的参考相比更低的无功功率参考，使得不期望的影响的风险最小化，特别是远离AC集电变电站的WT的端子处的过电压。此外，本文提出了一种控制策略，提高电压穿越能力的风力发电机在海上电网中的故障，从而导致在海上交流电网的动态电压分布改善。
This paper presents a coordinated voltage control scheme (CVCS) for a cluster of offshore wind power plants connected to a voltage-source converter-based high-voltage direct current system. The primary control point of the proposed voltage control scheme is the introduced Pilot bus, which is having the highest short-circuit capacity in the offshore AC grid. The developed CVCS comprehends an optimization algorithm, aiming for minimum active power losses in the offshore grid, to generate voltage reference to the Pilot bus. During the steady-state operation, the Pilot bus voltage is controlled by dispatching reactive power references to each wind turbine (WT) in the wind power plant cluster based on their available reactive power margin and network sensitivity-based participation factors, which are derived from the dV/dQ sensitivity of a WT bus w.r.t. the Pilot bus. This method leads to the minimization of the risk of undesired effects, particularly overvoltage at the terminals of the WT located far away from the AC collector substation, by dispatching lower reactive power references compared with the ones nearer to the substation. In addition, this paper proposes a control strategy for improved voltage ride through capability of WTs for faults in the offshore grid, thus leading to improved dynamic voltage profile in the offshore AC grid.