[China Aluminum Network] The main function of the inverter is to convert the variable DC voltage input of the power supply into a non-interfering AC sine wave output, which can be used by both the equipment and the grid.
I. Requirements for Solar Power Generation for PV Inverters For engineers familiar with power management, what are the points of designing inverters for solar power generation systems need additional attention? First of all, with regard to the use of inverters in existing photovoltaic systems, they generally can only be used for 5 to 10 years. However, the service life of photovoltaic panels is as long as 25 years. Inverters become less reliable in photovoltaic systems. Components. IR's Alberto Guerra suggested that designers must consider the lifetime of photovoltaic system inverters. Solar inverter technology industry has high expectations for product life, generally can guarantee the use of 20 to 25 years, so special emphasis on the reliability of each component.
Second, the key to improve the life of photovoltaic inverters The lifespan of photovoltaic inverters is the reliability of their components. Although semiconductor devices usually achieve this level of reliability, they may present a challenge to passive components. , especially electrolytic capacitors. The reliability of electrolytic capacitors has become one of the keys to improving the reliability of photovoltaic inverters.
Third, the role of electrolytic capacitors in the photovoltaic inverter PV inverter can be seen as a special-purpose inverter with DC power supply, the output frequency of 50Hz or 50Hz synchronization with the grid. There is no current pulse in the rectifying circuit generated by the rectifier, so that the function of the capacitor on the DC bus is a DC bus capacitor or becomes a "DC-Link" capacitor, and its function is to absorb the high-order harmonics of the switching frequency generated by the inverter. Triple frequency current and higher harmonic current of current and output frequency.
IV. Requirements for Photovoltaic Inverters on Electrolytic Capacitors 1. High-voltage, high-power photovoltaic inverters directly incorporate the converted AC power into high-voltage power grids. However, from the viewpoint of safety regulations, the output voltage of photovoltaic cells is generally low. Up to 900V, two 450V electrolytic capacitors can be connected in series, but two 500V electrolytic capacitors can be connected in series for safety. Therefore, high-voltage capacitors are required to reduce the number of capacitors in series and improve reliability.
2. High ripple-tolerance Generally, the current flowing through the capacitor of the PV inverter is 0.44 times the effective value of the inverter output current. For example, the output voltage of the PV inverter is 250V line voltage, the output current corresponding to 1kW power output is about 2.54A, and the current flowing through the DC bus capacitor is 1.12A. The DC bus capacitor of 100kW PV inverter needs to pass 112A rms current, and the rated current of the selected capacitor should not be lower than this value. If the rated current of an electrolytic capacitor does not meet the requirements, multiple electrolytic capacitors should be selected in parallel to obtain the required current. Therefore, a single high-ripple electrolytic capacitor is required to reduce the number of electrolytic capacitors in parallel and improve overall reliability.
3. Long lifespan In the solar power system, the service life of the photovoltaic panels is as long as 25 years, and the inverters are generally used only for 5 to 10 years as the photovoltaic system. Therefore, the lifetime requirement of the photovoltaic power generation system for photovoltaic inverter systems is 25 The level of the year. For a passive component electrolytic capacitor, its negative electrode is an electrolyte that will slowly dry out as the use time increases. This will inevitably require the electrolytic capacitor industry to produce longer life electrolytic capacitors to meet the requirements of photovoltaic inverters.
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