A photovoltaic inverter is a device that converts direct current into alternating current. Because it is the reverse process of rectification, it is called inversion. Solar cells generate direct current under sunlight, but systems powered by direct current have significant limitations. The main function of an inverter is to convert the variable direct current voltage from the power source into an interference-free alternating sine wave output, which can be used by devices or fed back to the grid.

Requirements for Photovoltaic Inverters in Solar Power Generation

For engineers familiar with power management, what additional points should be noted when designing inverters for solar power generation systems? First of all, based on the current usage of existing photovoltaic system inverters, they generally only last for 5 to 10 years, while the lifespan of photovoltaic panels can reach 25 years. Inverters have become the least reliable component in photovoltaic systems, so designers must consider the lifespan of inverters. The solar inverter industry has high expectations for product lifespan, typically guaranteeing a lifespan of 20 to 25 years, and therefore pays special attention to the reliability of each component.

Key Factors in Improving the Lifespan of Photovoltaic Inverters

The lifespan of photovoltaic inverters is determined by the reliability of their components. Although semiconductor components usually achieve this level of reliability, it may be a challenge for passive components, especially electrolytic industrial capacitors. Improving the reliability of electrolytic capacitors is key to improving the reliability of photovoltaic inverters.

The Role of Electrolytic Industrial Capacitors in Photovoltaic Inverters

Photovoltaic inverters can be seen as special frequency converters powered by direct current sources, with an output frequency of 50Hz or synchronized with the grid's 50Hz. There is no rectification circuit-generated current pulse, so the function of industrial capacitors on the DC bus is to act as bus DC capacitor, absorbing the high-frequency harmonic current and three times the frequency current and high-frequency harmonic current generated by the inverter.

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