Application of Acrel Multifunction Protection Relay in Photovoltaic Grid-Connected Cabinets

The distributed grid-connected photovoltaic system is a power generation method that directly converts solar energy into electrical energy using photovoltaic modules, providing high-quality electrical energy to the distribution network with strong stability and reliability. Such systems are usually built on the user side, focusing on self-consumption, with excess electricity fed back to the grid. The photovoltaic grid-connected cabinet, as a key distribution device connecting the photovoltaic power station and the grid, is responsible for the protection and metering of the total photovoltaic power generation, ensuring the safety and economic efficiency of the power generation system.

The design of the photovoltaic grid-connected cabinet includes core components such as disconnectors and circuit breakers, and is equipped with multifunction protection relays. These relays can provide multiple protection functions, including overcurrent protection, overvoltage protection, and islanding protection. By monitoring the operating status of the photovoltaic power generation system in real-time, the multifunction protection relays ensure that appropriate measures are taken quickly in the event of a fault, protecting the safety of equipment and personnel.

Monitoring and Protection Solutions of the Photovoltaic Grid-connected Cabinet

During the operation of the photovoltaic grid-connected cabinet, voltage and frequency fluctuations on the grid side often impact the system. To effectively respond to these challenges, the application of multifunction protection relays is particularly important. They can not only collect grid-connected voltage, frequency, and current signals in real-time but can also quickly disconnect the grid-connection point in the event of an islanding phenomenon to ensure the safe operation of the system.

Specifically, the multifunction protection relays can be configured for various protection functions to adapt to different operating conditions. By combining with power quality monitoring equipment, they can monitor parameters such as voltage harmonics, voltage fluctuations, and frequency deviations in real-time, ensuring the stable operation of the photovoltaic system under various conditions. This integrated solution not only enhances system reliability but also significantly reduces failure rates, improving the safety of maintenance personnel.

Advantages of Acrel Multifunction Protection Relays

Acrel multifunction protection relays possess multiple superior functions, suitable for photovoltaic grid-connected cabinets with voltage levels of 35kV and below. These relays not only have advanced protection principles and algorithms but also adopt a design with strong anti-interference performance, ensuring stable operation in complex grid environments. Their flexible configuration options allow them to meet the needs of different user terminal substations.

In addition, the multifunction protection relays support multiple communication methods, including Modbus-RTU and IEC 60870-5-103 protocols, facilitating seamless integration with other devices and systems. This multi-functionality makes them an ideal protection device in the fields of photovoltaic power generation, gas power generation, and other new energy sources. In the event of an islanding phenomenon, the multifunction protection relays can respond quickly, ensuring the safe disconnection of the photovoltaic power station from the grid and protecting the lives of maintenance personnel.

By applying Acrel multifunction protection relays in the photovoltaic grid-connected cabinet, users can not only improve the economic benefits of photovoltaic power generation but also ensure the long-term stability and reliability of the system. This solution is undoubtedly an indispensable part of the future development of photovoltaic power generation systems, heralding a more environmentally friendly and efficient way of energy utilization.