The application of mine frequency converter is relatively late compared with other inverters, but the rapid development trend in the past five years has led the industry. The most fundamental reason is that the backward electrical equipment can not meet the needs of industrial production. The old and old equipment is inefficient and energy-consuming. The technical problems that arise in the development of the explosion-proof industry need to be solved. At the same time, energy conservation, consumption reduction, and low-carbon emissions are the objective needs of social development. The state also attaches great importance to the technology upgrading and reconstruction of explosion-proof industries. Since the “Eleventh Five-Year Plan†to date, the explosion-proof industry has witnessed rapid technological development and the application of mine explosion-proof inverters has become increasingly widespread.
Today, mine explosion-proof frequency conversion has emerged more and more local brands, and has a strong local advantage in the standard convergence, industry demand grasp.
Expert remarks
Han Jujue: In 1982, Black University graduated to work at the Electric Automation Institute of the Shanghai Branch of the Coal Science Institute. After 94 years, he served as director of electrical automation. After retiring in 2002, he founded Shanghai Shendi Automation Technology Co., Ltd. With the support of the Jincheng Coal Mining Bureau, she led the team's technical staff to develop high-power mine series inverters and high- and low-voltage soft starters, and built the first two motors to feed back four-quadrant converters in China. Inverter loading test device. At the end of 2006, she was 60 years old and she retired for the second time. In July 2007, Shanghai Di-Ao Automation Technology Co., Ltd. was founded under the encouragement of some old coal mine leaders. She led the team's technical team to develop high-power inverters for mines with 1140V and above 630KW, and successfully applied the 630KW/1140V four-quadrant inverters for the first time in the SDIC Xinji Liuzhuang Coal Mine Roadway and along troughs and other transport belts. .
Diju Han Jue: Explosion-proof inverter "Past and present life"
Note: Since the establishment of Shanghai Diao Automation Technology Co., Ltd., it has been committed to the research on the reliability of the speed regulation and control devices and their systems for coal mining, mining, transportation, and electrical equipment. The KDJR series explosion-proof and intrinsically safe AC frequency conversion soft start controller developed by the company was listed as an innovation fund project by the Ministry of Science and Technology. All equipment has obtained explosion-proof certificate, mining product MA permit and production permit.
Mine frequency converter indissoluble bond
The birth of the frequency converter provides a frequency-adjustable power supply for the motor, which makes its speed control performance: high-precision torque, multi-machine linkage power balance and double closed-loop control performance in the motor operation has been the best Play. Practice has proved that: Inverters bring good news to the energy-saving and environmental protection of motors.
At the end of 1998, after we successfully developed the mine soft starter, we plan to develop mine inverters. In October of 1999, when the project was submitted to the hospital, it was at a time when the Asian economic crisis was occurring. At the same time, the coal mine was in the process of institutional adjustment. Therefore, the allocation of scientific research fees was very small. At that time, the chief in charge of scientific research said that he could only give 20,000 yuan. This is not enough to buy IGBT modules, and he has no alternative but to give up.
In March 2002, I retired. After receiving the company of our old dean, after reforming it, the first project involved mine converters. At that time, there was also Xu Kaicheng, who was the first person to eat "crabs." He led the technicians of Tangshan Kaicheng in R&D. They successfully obtained coal safety certification in 2001. Our company completed the MA certification in September 2002. In the development of our company's inverter, Comrade Chen Hanying, the chief mechanical and electrical engineer of the Jincheng Coal Mining Bureau and the owner of the lease station, gave me great support and provided full support from various aspects such as funds, technology, and test sites; more valuable I was very much encouraged by Chen Zhanchang, his team, and colleagues in the mines. They gave me great encouragement. They understood and tolerated our failures one time and again gave us encouragement and opportunities again and again. The Jincheng Bureau became the center of the large number of mine converters used at that time, which led to the visit of various units around to learn. This is the perfect situation for today's development of explosion-proof inverters.
The birth of explosion-proof inverters led to the promotion of a number of industries and products. The first is our explosion-proof electrical inspection station. At that time, the frequency converter had just come out. The inspection standards and inspection standards for the explosion-proof stations were incomplete, and some of the inspection items had no standard basis. At the time, Comrade Zhang Jian, the deputy chief of the explosion-proof station, collected technical data and standards related to the frequency converter at home and abroad, and initially compiled a test specification, which was carried out one by one in the implementation of the inspection, one success, one affirmation, and continuous practice The inspection specification was perfected, and on the basis of this, the inspection equipment was upgraded and related inspection instruments were added. This created conditions and provided convenience for the production of MA certification for explosion-proof inverter manufacturers.
After 2003, the frequency converter was widely used. With the rapid development of modern power electronic technology and computer control technology, the technical revolution of electric drive has been promoted, and AC speed control has replaced the DC speed regulation, which has become a general trend.
According to the statistics of the National Bureau of Statistics, in 2002, China consumed 162 billion kWh of electricity, of which 60%-70% was electrical energy, and about 1 trillion kWh was consumed by various types of motors. By the end of 2002, the total capacity of various types of electric motors in China was 500 million kilowatts, about 100 million units, and 85% were asynchronous motors, of which only less than 20 million kilowatts were controlled by inverters. With variable loads, electric motors with potential for energy saving have at least 150 million kilowatts in China. In the past few years, China's inverter market has maintained a growth rate of 12% to 15%. This rate has far exceeded the level of GDP growth in recent years and is expected to remain within the industry for at least the next five years. More than 10% growth rate. Considering the price drop factor of about 6%-8%, the increase in the installed capacity (power) of the upconverter in the Chinese market should actually be around 20%. In accordance with such a pace of development and the needs of the Chinese market, at least 10 years after the market can be saturated and gradually mature. Therefore, China's inverter manufacturing companies have a good space for development. Especially in the coal industry, among the high-power transmission machinery, fans and pumps occupy a major position, such as coal mine drainage pumps and exhaust fans, tap water pumps, etc., and drive motors with more than 400-10000 KW and voltages ranging from 6KV to 10KV. High-power high-voltage AC motors. High-voltage and high-power frequency converters are mainly used for speed control of such high-voltage motors.
According to statistics, the total output of high-voltage motors nationwide reached 3,8196.5 MW from 1987 to 1991, and the output is still increasing at an annual rate of 10%. In 1996 and 1997, the output of high-voltage motors nationwide reached 10 million KW. In terms of energy saving, frequency conversion speed regulation is the best and most economical and reasonable speed control technology, so high voltage frequency converters have great demand in the coal mining industry.
Adjustment phase of the coal market
At present, although the coal mine market is in the phase of structural adjustment, this is a trend toward more intensive, more environmentally friendly, and more reasonable prices for coal production. Coal products are developing towards the comprehensive utilization of coalbed methane, coal oil, clean coal and coal. These developments are Do not open high-tech, and ultimately, the frequency conversion technology, the main basis is:
1, the national policy requires high-power mining high-voltage inverter
A. Article 39, paragraph 2 of "The People's Republic of China on Energy Conservation Law" stipulates: The state encourages energy-saving technologies, develops motor speed-regulating and energy-saving technologies, and gradually realizes the economical operation of electric motors, fans, and pump equipment and systems, and improves the utilization of electric energy;
B. The coal industry is an important basic industry for the country’s economic lifeline and energy security. The State's “Eleventh Five-Year Plan†has supported 13 million tons of mining areas, 500 pairs of 10 million tons of mines, and only 6 million tons of mining areas by the end of 2011. The "12th Five-Year Plan" for the development of the coal industry promulgated in 2012 clearly stated: "Strengthen scientific and technological innovation, enhance scientific and technological support capabilities, and promote advanced and applicable technologies to improve the modernization of coal mine equipment, system automation, and management informatization levels.": "Promotion of coal mines Major equipment localization, focusing on new mine auxiliary transportation equipment, mine information network automation system, and development and demonstration applications of key components; and requiring that during the "Twelfth Five-Year Plan" period, structural adjustments be carried out to achieve integrated mine automation and improve mine safety. Production capacity
C. In order to implement the “Energy Lawâ€, the Coal Association proposed: “Every motor above 200KW requires high-voltage power to reduce the number of pressure reductionsâ€.
The above regulations provide laws and regulations and policy basis for the promotion and application of high- and low-voltage inverters for high-power mines.
2. Development and application of new technologies to boost high-power high-voltage inverters for mining
In order to implement the “Energy Lawâ€, after the eleventh five-year plan for coal mining in China, the underground power supply layout was upgraded from the ground and wellheads of 10KV and 6KV, 1140V work face, 660V of big lanes, 380V of coal preparation plant to: ground The fully digitalized integrated micro-electronic protection power supply system for 10KV at wellhead, 6KV for main roads, 3.3KV for working face, and 660V for coal preparation plant provides safe power supply for the use of high-voltage and high-voltage inverters of over 3300V in coal mines.
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