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1. Main research contents of electrical engineering


Traditional electrical engineering is defined as the sum of related disciplines used to create electrical and electronic systems, but today’s electrical engineering covers almost all engineering behaviors related to electronics and photons. It is one of the core disciplines in the field of modern science and technology. It can be said that : “Electrical engineering can be used wherever electricity is used.” Here are some research contents of electrical engineering:


1.1 Power Electronics and Electric Drives


Power electronics and power drives integrate power, electronics and control, and are the core of the electrical engineering field. It is mainly engaged in the research and development of the theory, analysis and control of power electronics and power transmission systems, such as research on new power electronic devices, conversion and control of electric energy, power electronic power supply, power transmission and its automation and other theoretical and applied technologies. It involves new structure, new circuit and new control strategy of AC and DC drive system; new method of on-line identification and fault diagnosis of AC motor model; on-line monitoring and fault diagnosis of power electronic equipment and its system; control theory in power electronics and power drive and application; reactive power compensation technology; modern power technology and so on. Its application covers almost all industries, including general industry, transportation, power system, household appliances, etc. In addition, the energy-saving effect of power electronic technology is very significant, which is of great significance for saving electric energy.


1.2 Electric motor and its control


In the modern industrialized society, various natural energy sources generally cannot directly drive production machinery, so motors are needed. They are commonly used equipment in industry, agriculture, transportation, national defense engineering, medical equipment and daily life, and electrical appliances refer to An electrical device that switches on, off, and converts parameters to control the circuit.


1.3 Power System Automation


Power system refers to the unified whole of electric energy production, transmission, distribution and use composed of power generation, transmission, substation, distribution, electric equipment and corresponding auxiliary systems. It can also be described as composed of power supply, power network and users. overall. Because a power system contains a large number of plants, stations and lines, it is a complex control system, so the power system automation technology has become one of the research focuses of modern social electrical engineering. For example, the computer control system in the power plant, the microcomputer relay protection technology, the power grid dispatching automation technology, etc., the power system automation is a hot spot in the development of electrical engineering, which not only makes the power system run more efficiently, obtains better economic benefits, but also What is important is the increased safety and reliability of production.


1.4 New technologies in electrical engineering


Since the development of electrical engineering, many new electrical technologies have emerged, such as: high-power pulse technology for surveying, superconducting electrical technology, high-precision medical devices for prevention, diagnosis, treatment, rehabilitation, etc., and renewable energy for the benefit of mankind Power generation technology, plasma technology that can be used for environmental protection, electrical automation technology closely integrated with electronic information technology, artificial intelligence, network technology, etc. With the development of technology, electrical engineering has shown a prosperous trend.


In general, electrical engineering is a technology related to the production and application of electric energy. The electric power industry is one of the important basic industries in the national economy, and it is also a discipline in the engineering education system. In recent years, it has penetrated into the fields of life science, physics, chemistry, etc., and it is a driving factor for the formation of cutting-edge technologies and new technology branches. Wide influence and huge effect.


2. New energy technology for electrical engineering


The exhaustion of fossil energy, climate change, environmental pollution and other issues are the common challenges faced by all mankind in the 21st century, while China is in a period of high economic growth with accelerated industrialization and urbanization, and energy and environmental problems have become increasingly prominent. The development of green economy, clean production and environmental protection technology, some important strategic emerging industries related to the future environment and human life are emerging. For electrical engineering, electric energy bears the brunt. In today’s society, human beings are inseparable from electricity. In the past, power generation mainly relied on thermal power generation, making thermal power plants a major killer of the environment. And it is very unwise. In order to promote the energy revolution and ecological protection, new energy technologies are gradually developed. Here are some new energy technologies:


2.1 Photovoltaic power generation technology of solar energy technology


With the depletion of traditional energy sources, solar energy has become a strategic emerging industry all over the world. The photovoltaic power generation process is simple, with no mechanical rotating parts, no fuel consumption, no emission of any substances including greenhouse gases, no noise, no pollution, and no pollution. Ecological protection plays a very important role.


Photovoltaic power generation is a technology that uses the photovoltaic effect of solar cells to directly convert the radiant energy of the sun into electrical energy. Photovoltaic power generation systems are divided into off-grid and grid-connected types. As the name suggests, grid-connected types can be integrated into the national grid for power supply. In the future, photovoltaic power generation will become an important power generation method, which will further reduce energy consumption and environmental pollution.


2.2 Wind power generation of wind energy technology


In addition to solar energy technology, wind power technology is also a highly clean energy technology. Wind energy resources are not only renewable resources, but also basically do not consume fossil energy in the process of wind energy conversion, so they do not pose a threat to the environment. Energy saving and emission reduction, reducing air pollution. The wind power generation system is mainly composed of a wind wheel, a transmission system, a braking system, a generator, a control system and other parts, and the impeller is driven by the wind to effectively convert the wind energy into electrical energy.


In recent years, with the continuous development of wind power generation technology, the cost has been reduced, and the efficiency has become higher. effect.


In addition, there are many new energy technologies such as smart micro-grid technology, bio-intelligent utilization technology, ocean energy hydropower technology, nuclear energy, etc. Through the continuous maturity of electrical engineering development, the continuous deepening of the high-tech field, green and environmentally friendly energy can be applied. It promotes the energy revolution and enables us to see the hope of a green ecological environment.


3.Reflections on ecological protection by new electrical engineering technologies


At present, human beings are facing the most serious environmental crisis in history. Air pollution, ozone layer destruction, acid and harm, etc., are seriously threatening economic development and even human survival. The national planning proposal emphasizes that it is necessary to adhere to green development, focus on improving the ecological environment, and promote the harmonious coexistence of man and nature. It is a huge task for the field of electrical engineering. It is necessary to promote energy revolution, energy technology innovation, and efficient and clean utilization of fossil energy such as coal. , accelerate the development of the utilization of renewable energy, promote scientific and technological innovation, comprehensively save and efficiently use resources, and implement a circular development plan.


Although new energy technology is very popular in modern society, it is not widely used due to its different shortcomings such as high cost, low efficiency and safety factors. To promote low-carbon cycle, green environmental protection, mainly from the following three aspects.


First of all, sustainable development can only be achieved by reducing energy waste, promoting the utilization and development of renewable energy, using new energy technologies, enriching the development of clean energy such as solar energy and wind energy, and reducing the use of fossil energy such as coal. This is the development of the new century. The theme is also something that everyone must consider.


Secondly, it is necessary to reduce the emission of pollutants, which is a very urgent requirement for contemporary thermal power plants. Since the sulfides and nitrides emitted by them are the main sources of air pollution, the treatment of this aspect should be strengthened. You can’t ignore the consequences just because you think about economic benefits. With the continuous development of electrical engineering, plasma technology has become the most effective and promising new technology for exhaust gas treatment. It can not only solve the harmful substances in exhaust gas, but also sterilize and disinfect. Therefore, with the continuous development of science and technology, it needs to be effectively used to ensure people. Harmony with nature.


In addition, energy must be used efficiently. About 1/3 of electricity is lost in the process from the power source to the user, and the current level of power loss in my country is three times the world average, so it needs a big improvement in terms of transmission. , In addition to technical problems, since today’s power plants are located in unmanned or remote areas, if the utilization of solar wind energy is increased, it is envisaged to set up photovoltaic power stations, wind turbines and other sites not far from users that do not affect life. Large factories are divided into small power stations, which may be more convenient for users, and the scope of inspection and maintenance is also greatly reduced. In large enterprises, the power consumption of equipment is also very important. This requires the continuous development and innovation of science and technology, and the continuous improvement of technology. The power of equipment should be reduced while the efficiency should be improved.


4. Conclusion


Electrical engineering connects all aspects of life, and the improvement of human living standards is inseparable from its development. With the continuous advancement of electrical engineering, the emerging technical problems and environmental pollution problems still require continuous research and progress. Research under the theme of green development It is meaningful for human beings, and it is worth thinking about.