The motor system energy-saving project is one of the top ten key energy-saving projects in the country. It is reported that from 2006 to 2007, all aspects of the energy-saving project for the motor system will be fully launched, based on the demonstration of energy-saving modifications in the key electricity industry, and extended to all modification industries, with annual modifications
5 million kilowatts, constituting an annual electricity saving capacity of 5 billion kilowatt hours; At the same time, we must urgently implement the legal, issuance, and promotion of supporting policies, standards, and norms required for the implementation of the electric power system energy-saving project; The plan is to retrofit a total of 25 million kilowatts by 2010, achieving a power saving of 25 billion kilowatt hours.
Skills are a 'weakness'
The electronic system is a widely applied industry. In 2003, the total assembly capacity of various electric vehicles was about 420 million kilowatts, with an annual power consumption of over 1 trillion kilowatt hours, accounting for about 60% of the country's electricity consumption. The operational efficiency was 10-20 percentage points lower than the progress level of foreign countries, which is considerable
The annual electricity output is approximately 150 billion kilowatt hours. In the first year of 2003, the national yield of electronic technology was about 45 million kilowatts, and the per capita efficiency was 2-3 percentage points lower than that of Tengda country. The efficiency of the electric propulsion system is 10-30 percentage points lower than that of Tengda country, which is comparable to the water efficiency of the 1970s and 1980s in the international 20th century
Ping. There are certain differences in terms of furnace age, reliability, material consumption, noise, and sensation.
Some scholars believe that the lack of skills in motor punching has become a "shortcoming" in regulating energy-saving development.
Firstly, there is a significant gap between the energy-saving skills and equipment level of the national electric motor system, and the energy-saving targets are very far apart. The use of variable frequency speed regulation electric motor systems is still rare, accounting for less than 10% of the total; The national small and medium-sized electric vehicle concept is basically a common and conventional type, and has not yet been able to form a variable frequency speed control concept
There is a certain gap between the head series, inverter motor integration, intelligent motor integration, and mechatronics skills compared to international standards.
Among them, domestic small and medium-sized frequency converters mostly use U/f ratio control methods, with very little reference to progressive vector control and direct torque control methods. Their control functions, protection skills, reliability, and other aspects are difficult to compete with international products, and they will only adopt low-cost, low unit price markets
Strategy to dominate the low-end market.
Secondly, the replacement of conventional thyristors with new switchable power electronic devices has become a trend, and now the use of IGBT/IGCT and other new power electronic devices in frequency converters by international motors has become a major energy-saving strategy for electric systems. But the national skills and manufacturing level of power electronic devices are in line with international standards
The level gap is very, very large, and it is not possible to manufacture new power electronic devices such as IGBT/IGBT except for conventional thyristors. Therefore, the vast majority of domestic variable frequency IGBT/IGBT power electronic devices and supporting devices such as capacitors rely on the entrance.
Although the domestic conventional thyristor frequency converter is mature, its application scope is limited. Foreign variable frequency speed regulation skills and products dominate the energy-saving market of China's electric power system. Especially the high-performance and high-power variable frequency speed regulation system of national key projects has been completely replaced by foreign companies
Fragmentation of goods. The domestic high-power and high-performance variable frequency speed regulation system using new power electronic devices is still blank.
Especially in terms of energy-saving systems for electric vehicles, there is still a lack of design methods and evaluation techniques for energy-saving systems, and there is no complete skill scale, testing standards, and testing techniques for variable frequency speed regulation.
Power electronics and variable frequency speed regulation skills are high-tech skills, and the development investment in this area by the country is very, very large. The overall level of skills in this area in the country is 5-10 years lower than the international level. Although the national government is very concerned about energy conservation in the electric vehicle system, there is still room for improvement in this regard
The discussion on development investment is limited, and most of the limited investment is low-level repetitive development. There is currently no platform for developing skills and products related to power electronics and variable frequency speed regulation, so it does not constitute an industrial scale.
Advocate for efficient application of skills
Industry insiders believe that in order to promote the development of energy-saving systems for electric vehicles, it is necessary to start with improving skills, encouraging the production of efficient electric vehicles, and forcing the elimination of inefficient electric vehicles. According to the current classification of motor efficiency and the international IEC motor scale, the efficiency of high-efficiency motors is generally
75%~89%. Currently, in actual operation nationwide, the per capita efficiency of electric vehicles with power levels ranging from 0.55 to 100 kilowatts is 92%; Develop and apply variable frequency speed control electric motors, and form industrialization; Variable frequency modulation of conventional electric motors with the same power, volume, and material
Speed electric thought, efficiency adjustment of 1% to 3%; Following the international development trend, we are developing and researching intelligent electric motors, which integrate electric motor frequency converters and control systems into a single electric motor system, achieving energy savings of 20% to 30%.
Secondly, the frequency converter is a key energy-saving component of the electric motor system, and the efficiency of the electric motor system can save 10% to 15% by using frequency conversion speed regulation. Electric motor speed regulation has great potential for energy saving, but relying solely on variable frequency speed is not enough. Therefore, for special applications and specific ranges, it is recommended to use it
It can better highlight the financial aspect. For example, although the AC-AC frequency conversion of domestically produced conventional thyristors is mature, it should be further expanded in terms of scale and application scope. Considering the development and application of new power electronic devices such as IGBT/IGCT, the focus should be on application skills research and development, while actively organizing the development of new devices
Research and development. Moreover, the focus of the discussion is on developing and referencing new power electronic devices to develop high-performance and low pollution high-power variable frequency speed regulation systems, establishing the development of a number of domestically produced equipment skills in industries such as pig iron, coking coal, and locomotive towing.
In addition, discussions should be held on energy-saving skills and application skills for the electric vehicle system, and skill scales, testing scales, and testing standards for energy-saving of the electric vehicle system should be established.