铝电解电容器在在光伏逆变器中的应用最为广泛，光伏发电系统产生的电流为直流电，但民用电力以交流供电为主，且太阳能发电最终将走向并网运行，这就意味着太阳能发电必须通过逆变器将直流电转换为交流电来驱动家用电器等负载。因此，逆变器在太阳能发电系统中具有举足轻重的作用。
aluminum electrolytic capacitors are most widely used in photovoltaic inverters. the current generated by photovoltaic power generation system is dc, but civil power is mainly ac power supply, and solar power generation will eventually move to grid connected operation, which means that solar power generation must convert dc into ac through inverter to drive loads such as household appliances. therefore, inverter plays an important role in solar power generation system.
光伏逆变器对铝电解电容器的要求主要体现在高电压、高耐纹波能力和长寿命。
the requirements of photovoltaic inverter for aluminum electrolytic capacitor are mainly reflected in high voltage, high ripple resistance and long life.
1.高电压
high voltage
一般大功率的光伏逆变器，将转化后的交流电直接并入高压电网中，但从安规角度考虑，光伏电池组的输出电压一般不高于900v，可以选择两只450v电解电容器串联，但为了提高安全性，可以选择2只500v电解电容器串联。所以需要高电压等级的电容器来减少电容器的串接而提高可靠性。
generally, high-power photovoltaic inverter directly integrates the converted ac into the high-voltage power grid. however, from the perspective of safety regulations, the output voltage of photovoltaic battery pack is generally not higher than 900v. two 450v electrolytic capacitors can be selected in series. however, in order to improve safety, two 500v electrolytic capacitors can be selected in series. therefore, high voltage capacitors are needed to reduce the series connection of capacitors and improve reliability.
2.高耐纹波能力
high ripple resistance
一般光伏逆变器流过电容器的电流为逆变器输出电流有效值的0.44倍。如光伏逆变器的输出电压为线电压250v，每输出1kw功率对应的输出电流约2.54a，流过直流母线电容器的电流为1.12a。100kw光伏逆变器的直流母线电容器需要流过112a有效值电流，所选择的电容器的额定电流不应低于这个数值。如果一只电解电容器的额定电流不能满足要求，要选择多只电解电容器并联方式获得所需要的电流值。所以要求单只高耐纹波能力的电解电容器来减少电解电容器的并联数量，提高整体可靠性。
in general, the current flowing through the capacitor of photovoltaic inverter is 0.44 times of the effective value of inverter output current. if the output voltage of the photovoltaic inverter is 250v, the output current corresponding to each output 1kw power is about 2.54a, and the current flowing through the dc bus capacitor is 1.12a. the dc bus capacitor of 100kw photovoltaic inverter needs to flow 112a rms current, and the rated current of the selected capacitor shall not be lower than this value. if the rated current of one electrolytic capacitor cannot meet the requirements, select multiple electrolytic capacitors in parallel to obtain the required current value. therefore, a single electrolytic capacitor with high ripple resistance is required to reduce the number of parallel electrolytic capacitors and improve the overall reliability.
3.长寿命
long life
在太阳能发电系统中光伏电池板的使用寿命长达25年，而逆变器成为光伏系统一般只能使用5到10年，所以太阳能发电系统对光伏逆变系统的寿命要求为25年的水平。对于无源元件电解电容器，它的负极为电解液，会随着使用时间的增长慢慢干涸而失效。这势必需要电解电容器行业制造出更长寿命的电解电容器来符合光伏逆变器的要求。
in the solar power generation system, the service life of photovoltaic panels is up to 25 years, while the inverter can only be used for 5 to 10 years. therefore, the service life of photovoltaic inverter system in solar power generation system is required to be 25 years. for passive component electrolytic capacitor, its negative electrode is electrolyte, which will slowly dry up and fail with the increase of service time. this is bound to require the electrolytic capacitor industry to manufacture electrolytic capacitors with longer life to meet the requirements of photovoltaic inverter.
三和螺栓式铝电解电容器在光伏逆变器行业使用最为广泛，经过可靠性试验完全符合新能源领域要求的长寿命，高纹波，高电压的要求。如果您正好需要采购光伏逆变器的电容，欢迎和我们联系，我们会第一时间为您提供现货及人生就是搏的技术支持。
sanhe bolted aluminum electrolytic capacitor is the most widely used in the photovoltaic inverter industry. after reliability test, it fully meets the requirements of long life, high ripple and high voltage in the field of new energy. if you just need to purchase the capacitor of photovoltaic inverter, please contact us, and we will provide you with spot and technical support at the first time.