When the photovoltaic system is expanded or upgraded, what corresponding adjustments or upgrades are required for the photovoltaic grid-connected cabinet?
Publish Time: 2024-12-11
With the continuous development of photovoltaic technology and the expansion of application scenarios, photovoltaic systems often face the need for expansion or upgrading. In this process, the photovoltaic grid-connected cabinet, as a key hub connecting the photovoltaic array and the power grid, also needs to be adjusted and upgraded accordingly to ensure the efficient, stable and safe operation of the entire system.First, in terms of capacity, if the photovoltaic system is expanded, the newly added photovoltaic array will generate more electricity. This requires the rated current and rated voltage parameters of the photovoltaic grid-connected cabinet to be re-evaluated and upgraded. For example, the grid-connected cabinet that was originally adapted to a smaller power photovoltaic system may need to replace key electrical components such as circuit breakers and contactors with larger rated currents after expansion to meet the safe transmission and distribution of the newly added electricity. At the same time, the cross-sectional area of the busbar may also need to be increased to reduce line losses and adapt to greater current carrying requirements.Secondly, for the control function, as the photovoltaic system becomes more complex and intelligent, the control circuit and algorithm of the grid-connected cabinet also need to be upgraded. After expansion or upgrading, more photovoltaic inverters may be involved, and the grid-connected cabinet needs to have stronger coordination and management capabilities. For example, optimize the power control algorithm to achieve accurate allocation of the output power of multiple inverters to ensure that the power quality meets the grid access requirements. In terms of protection functions, it also needs to be further improved, such as adjusting the set value range of overcurrent and overvoltage protection to adapt to the larger current and voltage fluctuations that may occur after expansion, while ensuring that functions such as island protection can still operate reliably under the new system architecture.Furthermore, the improvement of communication and monitoring functions is indispensable. The photovoltaic system after expansion or upgrading is larger in scale and requires more comprehensive and real-time monitoring and management. Photovoltaic grid-connected cabinet should support more advanced communication protocols, such as upgrading from traditional Modbus to high-speed and reliable IEC 61850 protocol, so as to achieve seamless connection with the new monitoring system. Through the communication function, more operating parameters of the grid-connected cabinet can be remotely read and controlled, such as real-time monitoring of the current, voltage, power factor, etc. of each connection point, and the switch equipment can be remotely operated, which is convenient for operation and maintenance personnel to perform remote diagnosis and fault handling.In addition, improvements may also be needed in terms of heat dissipation design. Since the power of electrical components increases after capacity expansion, more heat is generated. The heat dissipation structure of the grid-connected cabinet, such as the power of the cooling fan and the area of the heat sink, may need to be optimized to ensure that the internal components operate within the normal operating temperature range, extend the service life of the equipment and maintain its performance stability.In short, when the photovoltaic system is expanded or upgraded, the adjustment and upgrade of the photovoltaic grid-connected cabinet is a systematic project involving electrical capacity, control functions, communication monitoring and heat dissipation. Only comprehensive and scientific planning and implementation can enable the photovoltaic grid-connected cabinet to play its due key role in the new system environment and ensure the continued good operation of the photovoltaic system.
