Introduction
Solar inverter, also known as power regulator, is a crucial equipment in the process of grid-connected solar photovoltaic power generation.Solar inverter is the core equipment in the solar photovoltaic system, its main function is to convert the direct current (DC) generated by solar panels into alternating current (AC), so that it can be incorporated into the grid or directly supplied to the AC load.
Working Principle
The solar inverter converts direct current into alternating current through its internal circuits, including the MPPT (maximum power point tracking) system, DC-DC converters, inverter circuits, filters, etc. The inverter is also responsible for real-time monitoring and regulation to ensure that the photovoltaic system is operating at maximum efficiency and to protect the system from abnormal voltages or currents.
Types And Characteristics
1.Centralized inverter:
Application scenario: Mainly used in centralized large-scale ground photovoltaic power stations with uniform illumination, such as mountains, deserts, water and other scenes.
Features: large power, small quantity, easy to manage; Fewer components, good stability, easy to maintain; There are power factor adjustment function and low voltage crossing function, good grid regulation. But MPPT voltage range is narrow, the component configuration is not flexible; The power consumption and the ventilation and heat dissipation of the equipment room are large.
2.Series inverter:
Application scenario: Applicable to centralized power stations, distributed power stations, and small and medium-sized rooftop power stations.
Features: The power is relatively small, but the MPPT voltage range is wide, the component configuration is flexible; It is not affected by the module difference and shadow occlusion, and the power generation is increased to the maximum extent. Low power consumption and low fault impact. However, the electrical gap of the power device is small, which is not suitable for high altitude areas; More components, integrated together, slightly poor stability; Outdoor installation easily leads to aging of the shell and heat sink; The number of inverters is large, the total failure rate will increase, and the system monitoring is difficult. Without isolation transformer design, electrical safety is slightly poor.
3.Distributed inverter:
Application scenario: It is also suitable for centralized large-scale ground photovoltaic power plants, such as mountains, deserts, water and other scenes.
Features: Combining the advantages of centralized inverter and series inverter, it has the characteristics of "centralized inverter" and "decentralized MPPT tracking". This reduces construction costs and increases power generation. However, as a new form, the distributed inverter is relatively few in the application of engineering projects, and its safety, stability and high power generation characteristics still need to go through the inspection of engineering projects.
4.Micro inverter:
Application scenario: Mainly suitable for distributed household use and small distributed industrial and commercial rooftop power station.
Features: The maximum power peak of each photovoltaic module is tracked separately, and then integrated into the AC power grid through inverter. The micro inverter has the smallest volume and the smallest power, and the general power is below 1 kilowatt.
Advantages
1.Automatic operation and shutdown: The photovoltaic inverter can automatically start or stop operation according to the state of the grid or lighting conditions to ensure the stability and safety of the system.
2.Integration and modularization: The integration and modularization of inverters can simplify the design and installation process of photovoltaic systems and improve the reliability and stability of the system.
3.Green environmental protection and sustainable development: As an important part of the photovoltaic system, the inverter's environmental performance and sustainable development have also become the focus of attention. Companies need to pay attention to environmental regulations and sustainability requirements, and adopt environmentally friendly materials and energy-saving technologies to reduce the environmental impact of their products.
Development
Solar inverters are developing in the direction of energy storage and intelligence. With the increase of photovoltaic installations and the growth of demand for energy storage systems, photovoltaic inverter companies are going deep into the field of energy storage and developing energy storage batteries and system products. At the same time, the intelligent inverter can realize data acquisition, energy management and power station monitoring, and improve the operation efficiency of the power station.
Conclusion
In summary, solar inverter is the key equipment in the process of solar photovoltaic grid-connected power generation, with a variety of important functions and application values. With the continuous progress of technology and the continuous development of the market, photovoltaic inverters will continue to develop in the direction of more efficient, more intelligent and more environmentally friendly.