Optimization-based reactive power control in HVDC-connected wind power plants
Optimization-based reactive power control in HVDC-connected wind power plants
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DOI：
10.1016/j.renene.2017.02.081
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发表时间：
2017-08
期刊：
影响因子：
8.7
通讯作者：
K. Schönleber;C. Collados;R. T. Pinto;Sergi Ratés-Palau;O. Gomis‐Bellmunt
中科院分区：
文献类型：
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作者：
K. Schönleber;C. Collados;R. T. Pinto;Sergi Ratés-Palau;O. Gomis‐Bellmunt
高压直流（HVdc）系统的一个应用是连接远程定位的海上风力发电厂（WPP）。在这些系统中，海上WPP电网和同步主电网以解耦模式运行，并且陆上HVdc转换器满足主电网的电网规范要求。因此，海上电网可以在正常条件下通过海上HVdc转换器和连接的风力涡轮机独立地操作。通常，众所周知，优化的无功功率分配可以降低元件负载和功率损耗。本文的目的是提出和评估一个无功功率分配优化内高压直流连接的风电场。对于这些系统，离岸转换器通过施加频率和电压来操作相邻电网。参考电压幅值被用作优化算法的附加控制变量。损失函数包括收集网格和转换器损失。与传统的无功功率调度策略相比，所提出的策略的使用导致有效地减少损耗，同时改善电压分布。一个500兆瓦规模的WPP的案例研究表明，当使用所提出的策略时，每年额外的能源产量为6819兆瓦时，或经济效益为886千欧元/年。
One application of high–voltage dc (HVdc) systems is the connection of remotely located offshore wind power plants (WPPs). In these systems, the offshore WPP grid and the synchronous main grid operate in decoupled mode, and the onshore HVdc converter fulfills the grid code requirements of the main grid. Thus, the offshore grid can be operated independently during normal conditions by the offshore HVdc converter and the connected wind turbines. In general, it is well known that optimized reactive power allocation might lower the component loading and power losses. This paper aims to propose and assess a reactive power allocation optimization within HVdc–connected WPPs. For these systems, the offshore converter operates the adjoining grid by imposing frequency and voltage. The reference voltage magnitude is used as additional control variable for the optimization algorithm. The loss function incorporates both the collection grid and the converter losses. The use of the proposed strategy results in an effective reduction of losses compared to conventional reactive power dispatch strategies alongside with improvements of the voltage profile. A case study for a 500 MW–sized WPP demonstrates an additional annual energy production of 6819 MWh or an economical benefit of 886 k€yr−1when using the proposed strategy.