In the past few years, the installed capacity of large-scale ground power stations has been soaring, from hundreds of megawatts to gigawatts, and the scale of power stations has continuously broken records; However, the larger the scale, the faster the risk accumulates. Industry data shows that about 90% of photovoltaic power plant accidents originate from the DC side, with hidden dangers such as component hot spots, fuse failure in combiner boxes, aging of cable insulation, and virtual connections at terminals... These hidden dangers are like "chronic diseases", seemingly insignificant defects that are extremely difficult to detect in daily operation and maintenance, but may generate arcs at any time, leading to fire accidents.

The verification of a "real battle" in the event of a sudden fire in a power station: Not long ago, a real fire at an 800MW photovoltaic project site brought the pain point of this industry into the spotlight. Thick smoke suddenly rose from Unit 3 of Project 127, and a certain brand's combiner box corresponding to the fourth branch caught fire due to an external short circuit. At the first moment of the fire, the Sunshine Power 1+X modular inverter system installed in the 127th array instantly recognized an abnormal signal on the DC side. The built-in excitation fuse actively cut off the faulty branch within 2 milliseconds, and the "spark" of the arc was accurately extinguished, without spreading to any inverter or adjacent branch.

What did Sunshine Power do right behind 2 milliseconds? Faced with the stubborn problem of unpredictability and non procrastination on the DC side, passive waiting is obviously a dead end. Traditional fuses rely on high current heating of the melt due to faults, which belongs to passive response and reacts slowly under conditions such as weak light and complex waveforms. The active protection scheme of the excitation fuse of Sunshine Power completely subverts this logic. It no longer waits for fault current foolishly, but works in deep coordination with the intelligent control center of the inverter, which can quickly cut off faults within 2 milliseconds under more than 15 extreme working conditions. Its biggest feature is "fast, accurate, and stable": it actively identifies and disconnects faults in the early stages, and the system only isolates the faulty branch to ensure the normal operation of the remaining parts of the inverter.



过去几年，大型地面电站装机规模一路狂奔，从百兆瓦到吉瓦级，电站的体量不断刷新纪录；然而，规模越大，风险聚集的速度也就越快。行业数据显示，约90%的光伏电站事故源于直流侧，组件热斑、汇流箱熔断器分断失效、线缆绝缘老化、端子虚接……这些隐患如同“慢性病”，看似不起眼的缺陷，在日常运维中极难察觉，却随时可能产生电弧，从而酿成火灾事故。

电站突发火情 一场“实战”的校验：就在不久前，某800MW光伏项目现场的一场真实火情，将这一行业痛点推到了聚光灯下。浓烟从项目127号方阵第3单元突然窜起，第4支路对应的某品牌汇流箱因外部短路起火。火情发生的第一时间，127号方阵搭载的阳光电源1+X模块化逆变器系统瞬间识别到直流侧异常信号，内置的激励熔丝在2毫秒内主动切断故障支路，电弧的“火种”被精准掐灭，没有蔓延到任何一台逆变器或邻近支路。

2毫秒背后 阳光电源做对了什么？面对直流侧这种“不可预测、不可拖延”的顽疾，被动等待显然是死路一条。传统熔丝依赖故障大电流加热熔体，属于被动响应，在弱光、复杂波形等工况下反应迟缓。而阳光电源的激励熔丝主动保护方案，彻底颠覆了这一逻辑，它不再傻傻等待故障电流，而是与逆变器的智能控制中枢深度协同，可以在15种以上极限工况下2毫秒内快速切断故障。其最大特点就是“快、准、稳”：在故障早期即主动识别并分断，系统只隔离故障支路，确保逆变器其余部分正常运行。



Security is changing from a 'bonus point' to a 'must-have item'. On April 1st of this year, GB/T 35694-2025 "Safety Regulations for Photovoltaic Power Stations" was officially implemented, which constrains the safety regulations of power stations from three dimensions: construction, operation, and maintenance. The active protection scheme of Sunshine Power Supply's excitation fuse has been implemented as standard in its 1+X 2.0 modular inverters, matrix inverters and other products.



安全 正从“加分项”变成“必备项”。今年4月1日，GB/T 35694-2025《光伏发电站安全规程》正式实施，从建设、运行、检修三个维度对电站安全规程进行了约束。阳光电源激励熔丝主动保护方案已在其1+X 2.0模块化逆变器、矩阵逆变器等产品中实现标配。

(Using AI translation)

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