We present the design and performance results of a MW‐sized photovoltaic (PV), battery energy storage system (BESS), and diesel genset hybrid system, which has been now in operation for over 2 years. Built in two phases, the power generation of the island features a cumulated diesel genset power of 5.3 MVA, a PV system size of 4.15 MWp, and battery of 5 MVA and 5.9 MWh. The hybrid system reaches a renewable penetration over 46%, setting a milestone in the energy transition from fossil fuel towards MW‐sized renewable‐based power generation. The usage of voltage‐controlled grid‐forming inverters allows to switch off thermal power generation for 9 to 11 hours daily depending on the amount of solar irradiation and load featuring diesel savings of more than 1.7 million liters of diesel per year. During nighttime, the battery system is still active and has served already to avoid over 10 grid blackouts and automatically control the genset‐based generation. Furthermore, the hybrid system allows for substantial reduction in operational expenditures, spare parts, and maintenance intervals. The system also features a relevant impact on frequency, grid stability, and harmonics, hence increasing the power quality of the island. Thanks to appropriate system design based on experience and proprietary software, it is possible to predict the performance accurately and provide projections on savings.

中文翻译：

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结合光伏发电，电池存储和发电机组的圣尤斯塔休斯岛兆瓦级发电案例研究

我们介绍了兆瓦级光伏（PV），电池储能系统（BESS）和柴油发电机组混合动力系统的设计和性能结果，这些系统已经运行了2年以上。该岛的发电分为两个阶段，其特征是柴油发电机组的累积功率为5.3 MVA，光伏系统大小为4.15 MWp，电池容量为5 MVA和5.9 MWh。混合动力系统的可再生能源普及率超过46％，为从化石燃料到兆瓦级可再生能源发电的能源转换奠定了里程碑。电压控制并网逆变器的使用可以每天关闭9到11个小时的火力发电，具体取决于太阳辐射量和负载量，每年可节省超过170万升柴油。在夜间 电池系统仍然处于活动状态，并且已经避免了超过10个电网停电，并自动控制了基于发电机组的发电。此外，混合动力系统可大幅减少运营支出，备件和维护间隔。该系统还具有对频率，电网稳定性和谐波的重要影响，从而提高了孤岛的电能质量。由于基于经验和专有软件进行了适当的系统设计，因此可以准确地预测性能并提供节省量的预测。该系统还具有对频率，电网稳定性和谐波的重要影响，从而提高了孤岛的电能质量。由于基于经验和专有软件进行了适当的系统设计，因此可以准确地预测性能并提供节省量的预测。该系统还具有对频率，电网稳定性和谐波的重要影响，从而提高了孤岛的电能质量。由于基于经验和专有软件进行了适当的系统设计，因此可以准确地预测性能并提供节省量的预测。