With the continuous access of new energy sources, the upgrading of power electronic equipment, and the development of diversified power quality requirements, power quality will face more challenges. At the same time, market demand for reactive power compensation equipment, harmonic control equipment, etc. Will be heavy volume. Therefore, the monitoring of power equipment and instrumentation has also become the focus of development.
The market will step into the increase in the application of power electronic products in high-speed growth periods and the need for industrial upgrading. The issue of power quality will become more and more important, not only in traditional metallurgical and chemical industries, but also in newer industrial fields such as wind power generation and solar power generation. The demand for related products has gradually increased. The rapidly developing new energy industry will also become a key area for the development of power quality control equipment.
It is understood that there are two main reasons for generating power quality problems. On the one hand, with the development of regional grid interconnection and the increase of load power density, the total amount of reactive power occupied by electrical devices and transmission and distribution equipment is increasing, and the power factor in transmission and distribution networks is becoming more and more unstable. The power factor is generally low, and the problem of design capacity and system operation stability of transmission lines is becoming increasingly prominent.
On the other hand, with the increase of access power, harmonic pollution in the power grid is becoming more and more serious, resulting in increased power line loss and damage, frequent electrical control failures, electrical equipment accidents and even fires, which pose a serious threat to safe production. It has a serious impact on the performance of various types of electrical equipment and processing and testing equipment, as well as adversely affecting the quality of processed products.
In order to cope with the above problems, from the current solutions for power quality problems, it can be mainly divided into three categories: power quality monitoring systems to help users understand the status of power supply or power supply; power quality control equipment, such as reactive power compensation devices, Harmonic control equipment and so on, from the voltage, harmonics, power factor and other aspects of the power quality problems to be amended and improved; software systems to help companies achieve power quality monitoring and governance automation.
These three types of programs also have certain effects on the governance of power quality problems. However, since power quality is a new direction, research in foreign countries is not long, and development time in China is about 10 years. Compared with other directions of the power system, the overall scale is still small, and the investment in power quality is only the power grid investment. 1%~3%.
Lu Tianwen, general manager of ICT Research, believes that as the market matures, market capacity may change dramatically after three years, and the overall market scale is expected to grow rapidly from steady growth.
Power quality control is improved from two aspects: “At present, the power users of industrial and commercial powers pay insufficient attention to power quality testing and evaluation, which leads to a decrease in the effectiveness of governance investment; the power management companies have mixed forces and low price competition, and some units do not really solve problems for users; The quality of personnel varies, and there is a salesperson who flickers the user; when designing equipment, designers lack design parameters that can be referenced, said Huang Wei, Secretary-General of the Asian Power Quality Industry Alliance.
In fact, for residential users, the impact of power quality, such as voltage fluctuations and voltage dips, may be less pronounced. However, for high-tech enterprises, voltage fluctuations may bring serious consequences such as production line stagnation and elevator outage. For some high-precision enterprises, the level of power quality is one of the important factors in whether they choose to settle down.
Because poor power quality can disrupt the normal functions of electrical and electronic equipment, leading to major problems in industrial manufacturing and building distribution systems, leading to increased maintenance and replacement costs of electrical equipment, production line interruptions and product batch loss, resulting in high The electricity bills, lower production capacity and even jeopardize production safety.
It is not difficult to see that power quality issues endanger all aspects of power production, and it is necessary to continuously improve power quality control to ensure the safety of electricity. From the current point of view, the promotion of China's power quality control is mainly initiated by the power supply department, and power supply systems throughout the country have become active promoters of power quality control. On the other hand, due to the lack of understanding of the power quality and the consideration of cost factors, the company has shown a low level of enthusiasm for power quality control. This has made the power quality market in China slightly less attractive.
Domestic companies should consider power quality issues from the very beginning of design. According to the view of the professor-level senior engineer of the Power Quality Engineering Center of the Ministry of Education of Anhui University, enterprises should be improved from single power quality control to power quality control, power saving control, improved power supply reliability, power grid reconstruction, fault diagnosis and prediction, and distributed power supply. Grid control and other integrated control development. By having equipment manufacturing technology capabilities, it also has the ability to develop software development capabilities and system integration technologies. In addition, there is a need to train experts in power system analysis.
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