In new energy photovoltaic systems, the power storage converter (PCS) is the core hub for efficient conversion of photovoltaic DC power into grid AC power. YMIN film capacitors, with their high voltage resistance, low loss, and long life, are key components for enhancing the performance of photovoltaic PCS inverters, helping photovoltaic power plants achieve efficient energy conversion and stable output. Their core functions and technical advantages are as follows:
1. “Voltage Stabilization Shield” for the DC-Link
During the AC-DC conversion process in photovoltaic PCS inverters, the DC bus (DC-Link) is subject to high pulse currents and voltage spikes. YMIN film capacitors provide these benefits by:
• High-Voltage Surge Absorption: Withstanding high voltages of 500V to 1500V (customizable), they absorb transient voltage spikes generated by IGBT/SiC switches, protecting power devices from breakdown risks.
• Low ESR Current Smoothing: Low ESR (1/10 that of traditional aluminum electrolytic capacitors) efficiently absorbs high-frequency ripple current on the DC-Link, reducing energy loss and improving power conversion efficiency.
• High-Capacity Energy Storage Buffer: A wide capacity range allows for rapid charging and discharging during grid voltage fluctuations, maintaining DC bus voltage stability and ensuring continuous PCS operation.
2. Dual Protection of High Voltage Withstand and Temperature Stability
PV power stations often face harsh environments such as high temperature and high humidity. YMIN film capacitors meet these challenges through innovative designs:
• Stable Operation over a Wide Temperature Range: Operating temperatures cover -40°C to 105°C, with a capacitance degradation rate of less than 5% in high-temperature environments, preventing system downtime due to temperature fluctuations.
• Ripple Current Capacity: Ripple current handling capability is over 10 times that of traditional electrolytic capacitors, effectively filtering harmonic noise at the PV output and ensuring grid-connected power quality meets national standards.
• Long Life and Maintenance-Free: With a lifespan of up to 100,000 hours, far exceeding the 30,000-50,000 hours of aluminum electrolytic capacitors, this reduces the operation and maintenance costs of photovoltaic power plants.
3. Synergy with SiC/IGBT Devices
As photovoltaic systems evolve toward higher voltages (1500V architectures becoming mainstream), YMIN thin-film capacitors are deeply compatible with next-generation power semiconductors:
• High-Frequency Switching Support: The low-inductance design matches the high-frequency characteristics of SiC MOSFETs (switching frequency > 20kHz), reducing the number of passive components and contributing to the miniaturization of PCS systems (a 40kW system requires only 8 capacitors, compared to 22 for silicon-based solutions).
• Improved dv/dt Withstand: Enhanced adaptability to voltage changes, preventing voltage oscillations caused by excessive switching speeds in SiC devices.
4. System-Level Value: Improved Energy Efficiency and Cost Optimization
• Improved Efficiency: The low ESR design reduces heat loss, boosting overall PCS efficiency and significantly increasing annual energy production.
• Space Saving: High power density design (40% smaller than traditional capacitors) supports compact PCS equipment layout and reduces installation costs.
Conclusion
YMIN film capacitors, with their core advantages of high voltage tolerance, low temperature rise, and zero maintenance, are deeply integrated into key aspects of photovoltaic PCS inverters, including DC-Link buffering, IGBT protection, and grid harmonic filtering. They serve as the “invisible guardian” of efficient and stable operation in photovoltaic power plants. Their technology not only drives photovoltaic energy storage systems toward “maintenance-free throughout their lifecycle,” but also helps the new energy industry accelerate the achievement of grid parity and a zero-carbon transition.
Post time: Aug-14-2025