Solar inverter is the core of photovoltaic system, which is responsible for converting DC into AC. Electrolytic capacitors are mainly used for energy storage, filtering and voltage stabilization in this link to ensure the high efficiency and stability of electric energy conversion. In DC-Link of inverter, DC-Link buffers and filters, and electrolytic capacitor reduces energy loss by absorbing voltage fluctuation and suppressing high-frequency noise. For example, lorida's snap in series capacitors, with a withstand voltage of 570V and a capacity of 220-560μF, are specially designed for photovoltaic inverters, which can reduce the number of capacitors and reduce the cost. According to the high temperature working condition of inverter, electrolytic capacitor should have long life and high temperature resistance. Lorida's liquid horn capacitor, designed with temperature resistance of 105℃, has a service life of over 8,000 hours and is suitable for extreme environments such as desert.
The photovoltaic controller is used to adjust the charging and discharging process between the solar panel and the battery, and the electrolytic capacitor undertakes the functions of filtering and transient energy management here. For example, the 100μF/400V electrolytic capacitor of lorida is designed with ultra-small volume (18×25mm) and can withstand high temperature of 105℃, which is suitable for photovoltaic controllers with limited space to ensure the stable operation of the circuit. Suppress ripple current. The design of low equivalent series resistance (ESR) can reduce the energy loss during charging and discharging and improve the efficiency of the controller. For example, the ESR of aluminum electrolytic capacitor of lorida liquid patch is as low as 15mΩ, which significantly reduces the system noise.
Electrolytic capacitor is used for transient energy storage and voltage balance in energy storage system, especially when dealing with sudden change of illumination or load fluctuation. Lorida liquid horn capacitor has a large capacity (such as 3,000-6,800 μ f) and a withstand voltage as high as 630V, which can quickly respond to the change of energy demand and prolong the system life. Electrolytic capacitors are often used in combination with supercapacitors in scenes requiring high power output. For example, the supercapacitor is responsible for absorbing weak current (such as rainy days), while the electrolytic capacitor provides steady-state energy storage, which together improve the overall efficiency.
In photovoltaic cell manufacturing equipment, electrolytic capacitor is used for stable power supply of power module: anti-interference design: if the capacitor sensor needs to operate in high temperature and high electromagnetic interference (EMC) environment, the supporting electrolytic capacitor needs to have EMC resistance and high temperature resistance to ensure the detection accuracy of the equipment. Some production equipment requires high-frequency response, and the high ripple current tolerance of electrolytic capacitors (such as the ripple current of Screw series is 2.52A at 100Hz) can meet the requirements of rapid charge and discharge.
In the DC screen of photovoltaic power station with DC power supply system, electrolytic capacitor is used for energy storage and filtering, replacing traditional battery pack and reducing maintenance cost. Lorida improves the redundant safety of the system through the parallel design of multiple capacitors. LED driving power supply, miniaturized electrolytic capacitor (such as 16×32mm) is used for driving circuits of photovoltaic street lamps and other equipment, which supports wide temperature range (-25℃ to +105℃) and prolongs the service life of outdoor equipment.
Core advantages of Lorida electrolytic capacitor
Withstand voltage and service life: The special electrolytic capacitor for photovoltaic usually withstands voltage of 400V-630V, and its service life can reach 5000-10000 hours (for example, Vishay 193 series has a service life of 6000 hours at 105℃).
Temperature adaptability: support wide temperature range from -40℃ to +105℃, and adapt to extreme environments such as desert and alpine.
Cost-effectiveness: By optimizing the layout (such as distributed capacitor array) and material technology, the total cost of the system is reduced, while the energy efficiency is improved.
The application of electrolytic capacitor in photovoltaic field covers inverter, controller, energy storage system and production equipment, etc. Its high voltage resistance, long life and stability are the key to support the efficient operation of photovoltaic system. With the development of technology, electrolytic capacitors with miniaturization, high frequency, low resistance and extreme environment resistance will become the future trend, further promoting the energy efficiency improvement and cost optimization of photovoltaic industry.
