China
Clean energy, or green energy, refers to energy that does not emit pollutants and can be directly used for production and life. It includes nuclear energy and "renewable energy". Renewable energy refers to energy whose raw materials can be regenerated, such as hydropower, wind power, solar energy, biomass (biogas), geothermal energy (including ground source and water source) and tidal energy. Renewable energy does not have the possibility of energy depletion. Therefore, the development and utilization of renewable energy is increasingly valued by the country.
Solar clean energy converts the sun's light energy into other forms of heat energy, electrical energy, and chemical energy. No other harmful gases or solid waste are produced during the energy conversion process. It is an environmentally friendly, safe and pollution-free new energy.
Solar energy utilization methods are divided into direct utilization and solar thermal power generation, also known as solar photovoltaic power generation. Solar photovoltaic power generation is a new type of power generation method that uses the photovoltaic effect of solar cell semiconductor materials to directly convert solar radiation energy into electrical energy. There are two power generation systems: independent operation and grid-connected operation. The photovoltaic power generation system mainly consists of three parts: solar cell components, controllers and inverters. Among them, the solar cell module is the core part of the entire power generation system, which is also the most valuable part of the solar power generation system. Its function is to convert solar energy into electrical energy. The function of the solar controller is to control the working state of the entire system and to protect the battery from overcharge and overdischarge. The main function of the photovoltaic inverter is to convert the low-voltage direct current directly output by solar energy into usable alternating current.
Wind power generation refers to the conversion of wind kinetic energy into electrical energy, which is to first convert the kinetic energy of wind into mechanical kinetic energy, and then convert the mechanical energy into electrical kinetic energy.
Wind power generation consists of wind turbines, converters, grid-connected contactors, main circuit breakers, relays, box-type transformers, etc. The wind power converter uses three-phase voltage-type AC-DC-AC bidirectional converter technology, rotor-side inverter, DC bus unit, and grid-side rectifier. The wind power converter implements the stator magnetic field oriented vector control strategy in the rotor-side converter of the generator, and the grid-side converter implements the grid voltage oriented vector control strategy. Then it is connected to the grid through a box-type transformer.
