According to general statistics, in 2006, 2007 and 2008, the market for high-voltage, high-volume reactive power compensation products in China reached 107 million yuan, 235 million yuan, and 488 million yuan respectively; in 2009, it reached 2 billion yuan; in 2010, it reached 3 billion yuan; 2011 Annually 4 billion yuan, including static reactive power compensator (SVG, also known as STATCOM) more than 1 billion yuan; 2012 4 billion yuan. This market is still growing. Professor Jiang Qirong of the Institute of Flexible Transmission and Distribution Systems of Tsinghua University said. It is speculated that in the next few years, China's reactive power compensation market capacity may reach 7 billion to 14 billion yuan, and the application of power grids will gradually occupy a large proportion. With the improvement of power factor requirements of users and the improvement of enterprises’ understanding of the importance of power quality, the demand for reactive power compensation has been continuously promoted. Since the market broke out in 2004, the market of reactive power compensation equipment in China has been in a rapid rise. Demand boosts the market In the field of power quality management, reactive power compensation has always been a hot topic. The problem of industrial load power quality in China is serious and the dynamic compensation requirements are urgent. And because the industrial user market is relatively open, many reactive compensation manufacturers first choose this market as soon as they enter this field. It can be said that this market is the driving force behind the development of reactive power compensation in China. It is reported that typical industrial user markets include steel companies, coal companies, electrified railways, and petrochemicals. Due to a large number of large-scale impact and non-linear loads, steel companies face power quality problems such as low power factor, voltage fluctuation and flicker, three-phase imbalance, and harmonic interference. The energy consumption of the iron and steel industry accounts for about 15% of the national energy consumption, of which electricity consumption accounts for about 24%. Therefore, steel consumption accounts for 3.6% of the total energy consumption in the country. Most of these are impact loads. According to incomplete statistics, the industry has large More than 1,700 medium-sized electric arc furnaces cause a lot of voltage fluctuations and flicker, which has a great impact on the power grid. Similar to the iron and steel companies and petrochemical companies, coal companies also have problems with high impact load and large capacity. The mine hoist applied by the coal enterprise is a typical impact load, and the stand-alone power is from several hundred kilowatts to 6000 kW, which accounts for a large proportion of the total power supply load in the mine. The operating conditions of the machine are very variable, and the reactive power changes are also severe, and there is no need for dynamic compensation. The acceleration of electrified railway construction has also brought about a lot of power quality problems. At present, China’s electrified passenger railways are developing at a high speed, the speed of pure passenger lines will reach 350km/h, and the freight lines will develop towards heavy-duty and will open 20,000 tons of heavy-duty trains. As a result, the load of China's electrified railway power supply system is getting larger and larger, and the capacity for haulage of heavy-duty freight lines is getting larger and larger. The capacity of high-speed train power supply arms can reach over 120 MVA, and the regenerative braking feedback power can reach over 40 MW. This makes the voltage imbalance caused by the negative sequence current and the voltage fluctuation will become the primary power quality problems facing the electrified railway in the future. At the same time, due to the recent coexistence of AC electric locomotives and DC electric locomotives, harmonics and power factor problems will still exist. Dynamic reactive power compensation can effectively solve the voltage imbalance, reactive power, and harmonic problems that exist in the market. The market has relatively large demands on related products. In addition to industrial customers, reactive power compensation has also been applied in the fields of electric power and power grids, especially in the field of new energy power generation such as wind power and photovoltaic. In the wind power market, the coexistence of TCR SVCs, MCR SVCs, and SVGs has been established. From about 2012, the PV market gradually became 'fire'. This is mainly because wind power projects have been done in the past few years. In 2013, there are fewer new projects. A domestic leading company for reactive power compensation sales told reporters that, compared with wind power, PV market needs less reactive power compensation products, the owner of the time requirements are relatively high, the project is relatively simple. Power grid heavy-load centers and high-voltage, ultra-high voltage power transmission also need reactive power compensation. Jiang Qirong added that, for example, there are a large number of air conditioners and motors in the heavy-duty center of the power grid. In order to solve the problem of transient voltage stability, there is an urgent need for dynamic reactive power compensation when disturbances occur in the power grid. New demand appears With the changes in market demand and technological advancements, the technological development of China's reactive power compensation industry is also constantly changing, from the camera, fixed compensation capacitors to SVC, SVG. At present, the maturity of SVG devices to improve, began in the mine and other harsh environment Applications, SVG-based comprehensive (quotations market) compensation device has also developed rapidly, and now many manufacturers put their strength into the development of the SVG market. It is reported that in 2013 China Southern Power Grid will also install at least three sets of 200MVASVG. Now, reactive power compensation technology is facing new challenges. According to Jiang Qirong, users have proposed six new requirements for reactive power compensation technology. The first is that the device responds quickly, effectively suppressing voltage fluctuations and flicker. Among them, the requirements of reactive power compensation devices for wind farms are less than 30ms, and some special occasions require faster speeds. The second is strong adaptability, that is, no harmonic amplification occurs under various situations and various loads. The third is the small footprint, because many applications have been fixed venues, land acquisition difficulties. The fourth is that there is a strong reactive power compensation capability when the voltage is low and high. The fifth is to be able to cope with multiple power quality problems such as harmonics and unbalance, and imbalanced processing will result in an increase in product cost. Sixth, running energy-saving, SVC products are criticized because they do not save energy. The demand guides R&D. After this sort of combing, the development trend of high-voltage, large-capacity reactive power compensation technology has leapt on paper. In addition, since the construction of large-scale power grids is in full swing, it is also required to increase the voltage level and capacity of reactive power compensation products. The original reactive power compensation device is mainly 10kV products, and now it has developed to 35kV direct-connected products, which will further increase to 66kV in the future. Because the construction of 500kV substations gradually increases, the applicable reactive power compensation device can only be 66kV. Say, the user of the power grid certainly hopes that the higher the voltage grade of the reactive power compensation device is, the better, if can reach 110kV even better. The status quo of high voltage and large capacity reactive power compensation technology TCR SVC The technology is relatively mature, but because TCR generates harmonics, it must be applied together with capacitors and filters, and cannot be operated alone, so the loss is large. The market is relatively mature and it is the largest in industrial applications, but it is gradually being replaced by SVG. MCR type SVC That is, magnetic valve control reactor. MCR is a reactor in which the inductance can be continuously adjusted by changing the magnetic flux density of the iron core. In recent years, through industry research, this technology has made breakthroughs, making it the highest reliability among all reactors that can achieve continuous regulation, with the smallest harmonics, the smallest losses, and the least noise. SVG In recent years, the pace of development has been very fast. Key technologies include main circuit technology and control technology. The former is facing high pressure, large capacity, reducing harmonics, and reducing losses. The chain structure is the mainstream; the latter is not over-flowing toward rapidity and system impact. 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