Abstract: Due to the depletion of traditional energy sources, the increasing emphasis on environmental protection in various countries, and the various drawbacks of existing power systems, distributed generation will become the most important form of power generation in the future. Power electronics technology is one of the three key technologies of distributed generation and has extremely wide applications in distributed generation. This paper briefly introduces the applications of power electronics technology in energy transfer, improving power quality, and system energy storage. Keywords: Distributed generation; Power electronic equipment; Power quality; Energy storage Introduction The drawbacks of centralized power generation, long-distance transmission, and large-scale interconnected power grids make power systems appear both "clumsy" and "fragile." Currently, the combination of large power grids and distributed power grids is widely recognized by many energy and power experts worldwide as the main way to save investment, reduce energy consumption, and improve the stability and flexibility of power systems, representing the development direction of the power industry in the 21st century. Furthermore, countries around the world are now advocating "green environmental protection," while the power generation of China's power system has caused significant environmental damage. Adopting distributed generation and making full use of abundant "clean energy" in various regions is of great significance to China's sustainable development strategy. In recent years, foreign countries, especially the United States and Japan, have made breakthrough progress in the research of new distributed generation technologies, and these technologies are expected to account for an increasingly larger proportion of electricity production. China's research on distributed generation started later, and mature technologies have not yet been formed. However, distributed generation is the future trend of the electricity market. Therefore, it is necessary to accelerate research and exploration of distributed generation, and an important aspect of this is the application of power electronics technology to distributed generation. 1. Application of Power Electronics Technology in Power Transmission In addition to using traditional energy sources such as hydropower, coal, oil, and nuclear energy, distributed generation also widely adopts new alternative energy sources. Currently, several commonly used and low-cost systems are recognized as wind power systems, photovoltaic cells, micro turbines, and fuel cells. In these new distributed generation systems, power electronic devices play an extremely important role in energy conversion. 1.1 Micro Turbine Power Generation System Because the turbine operates at a very high speed, reaching 80 kr/min, and the AC generator has a very high frequency, it cannot be directly connected to the AC grid; a DC link is required. Figure 1 concisely illustrates the application of power electronic equipment in the energy conversion of a micro turbine generator system. The electrical energy generated by the AC generator is rectified and sent to a DC capacitor, then through an active DC/AC inverter before being fed into the power grid. 1.2 Wind Power Generation System Wind turbines can operate at either constant or variable speeds, so they can be connected to both synchronous and asynchronous motors. Due to their simplicity and economy, connection to asynchronous motors is widely used. Figure 2 depicts an asynchronous generator system, first rectified, then connected to the AC grid through an active inverter. 1.3 Photovoltaic System The general method for energy conversion in photovoltaic systems is to convert the DC energy stored in the photovoltaic cells into AC voltage synchronized with the grid using an active DC/AC inverter. Figure 3 clearly and concisely illustrates this process. Here, the three-phase inverter uses IGBT-type power transistors. 1.4 Fuel Cell System The DC voltage generated by the fuel cell is converted into AC voltage by an active DC/AC inverter. The conversion process is similar to that of the photovoltaic system, and Figure 4 illustrates this conversion process. DC transmission has many advantages over AC transmission. Therefore, in the above-mentioned power generation types, power transmission is mainly carried out using DC transmission. However, large power grids and people's daily lives and production require stable-frequency AC power. Rectifier and inverter circuits composed of power electronic devices, along with other power electronic interface equipment, play a crucial role in the energy conversion and transmission of distributed generation systems. 2. Applications of Power Electronics in Improving Power Quality 3. Other Applications In addition to the two aspects mentioned above, power electronics technology is also widely used in distributed power systems for energy storage, load balancing, and system fault protection. Based on considerations of system stability and economy, distributed systems need to store a certain amount of electrical energy to cope with emergencies. Modern energy storage technology has been developed to a certain extent, with promising technologies including battery energy storage (BESS), supercapacitor energy storage, and flywheel energy storage. Battery energy storage and supercapacitor energy storage employ the method of first converting AC power into DC power and storing it in batteries or containers; when energy storage is needed, the DC power is then converted back into AC power compatible with the system. Power electronic equipment plays a crucial role in this reversible conversion. Flywheel energy storage technology converts electrical energy into mechanical energy for storage. The basic structure of a flywheel energy storage system includes five parts, such as a flywheel rotor and a power converter. The practical application of flywheel energy storage has become a reality due to advancements in high-strength fibers, low-loss bearings, and power electronics technology. Because power system load changes are highly uncertain, timely control systems are required to regulate them; otherwise, a chain reaction may occur, leading to system failures and, in severe cases, system collapse. Power electronic equipment, with its rapid response and reliable control, can significantly reduce the probability of accidents and improve system stability when applied to power balancing and fault protection. 4. Conclusion Due to the various drawbacks of current power generation models, the depletion of non-renewable energy sources, and the increasing emphasis on environmental protection worldwide, distributed generation will become the most important power generation model in the future. The analysis in this paper shows that power electronics technology has extremely wide applications in distributed generation, and many research organizations now recognize power electronics technology as one of the three key technologies in distributed generation. Therefore, the development and application of power electronics technology will greatly promote the rapid popularization of distributed generation mode.