Application of power technology in power system

Application of power technology in power system

1 development history of power electronics technology

In a word, the development of modern power electronics technology is mainly from low-frequency technology to high-frequency technology to deal with problems, from traditional power electronics technology to modern power electronics technology. At present, power electronics technology has become the basis of environmental protection, energy saving, full automation, intelligence and mechatronics, and it is developing towards high-frequency application technology, green product performance and modular hardware structure.

2 The important role of power electronics technology in power system

The power system consists of three parts: transmission and distribution equipment, power generation equipment and power consumption equipment. The power system has been expanding gradually in history, and it didn't develop until it was connected to the internet. It is a large-scale system with wide geographical distribution, numerous equipment, interactive operation parameters and rapid transient, which is of great significance for safe, economical, efficient and high-quality operation. With the development of power electronic technology, power electronic equipment has begun to enter the power system, and provides technical means for solving power control. According to incomplete estimates, more than 60% of the final electricity consumption of users in developed countries has to be processed by one or more electronic conversion devices. Power electronics technology is one of the key technologies in the process of social modernization of power system. It can be said with certainty that the power system would not have today's achievements without power electronics technology.

3 the application of power technology in power system

3. 1 Intelligent control of power system

In the past 40 years, the control application and research of power system can be roughly divided into three stages: the control stage based on single input and single output of transfer function; Linear optimal control, nonlinear control and coordinated control stage of multi-computer machine system; The control stage of intelligence. Intelligent control is the development of current control theory. The new stage is basically used to solve and deal with the control problems of complex systems that are difficult to solve and explain by traditional methods. Especially for complex systems with strong nonlinearity, model uncertainty and strong adaptability. Therefore, some application prospects and routes of intelligent control in power system engineering are very broad. In application, some artificial neural networks should be used for coordination and control.

3.2 Flexible AC transmission system

In some particularly important parts of the transmission system, the main parameters of the transmission system (such as phase difference, voltage, reactance, inductive reactance, etc.). ) are regulated and controlled by power devices, making the transmission more reliable, more accurate, more controllable and more efficient. This is a comprehensive new technology that applies high-tech technologies such as microcomputer processing technology, power electronics technology and control technology to high-voltage transmission system to improve the controllability, operability, reliability and power quality of the system and obtain a lot of energy-saving benefits.

Development and application of smart grid based on power electronics technology in power system

4. 1 potential customers

For the power industry, smart grid is the general trend in the future, and renewable energy is an important driving force to promote the transformation from traditional power grid to smart grid. The clean, unstable and flexible distributed power generation mode is impacting the traditional centralized, large-capacity and planned power generation mode. The previous structure was that the power plants were as concentrated and as large as possible. The electricity generated by this centralized large-capacity power plant is transmitted to thousands of households through power grid transmission and distribution, which is unidirectional. Now, with the rise of renewable energy such as wind power and photovoltaic, the stability and adjustability of the power grid have been improved. However, renewable energy has a bright future because of its advantages of being clean and close to users. How to solve its inherent instability disadvantages requires renewable energy to become more intelligent, such as realizing forecasting function through informationization, IT technology and big data analysis. Therefore, renewable energy is one of the important driving forces to promote the migration of traditional power grid to smart grid. Once the transition to smart grid is realized, the electricity price can be adjusted according to the future weather, and many people's lifestyles will be affected. Smart grid affects the whole industrial chain, and the power generation end, transmission and distribution links and the final sales and consumption of electricity will all undergo profound changes.

4.2 Means of realization

To make energy more intelligent, IT is necessary to use IT technology. Deep integration of electric power and IT as information system. In the past, IT technology played an auxiliary role in the power grid, but in the smart grid stage, it is the driving force to truly realize the smart grid, and the two are deeply integrated and inseparable. The technical framework of IT information system is the foundation of the whole smart grid, which is a great opportunity for us. A better smart grid is a grid that closely connects users, power and equipment, and it is a fully connected grid that is ubiquitous and has no tiles. And this beautiful picture will be combined with new concepts such as mobile, big data, cloud computing and Internet of Things in the future. Great innovation requires the participation of many enterprises.

5 concluding remarks

With the rapid development of information computer science and technology, the information age is coming, and the automation of power system will face a new revolution. Among them, it needs the support of power electronics technology and smart grid technology, and multimedia and intelligent control technology will provide strong power for the leap-forward development of power system automation.

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