Analyze the future development of static var compensator devices

Typical examples of static var compensators are thyristor-switched capacitors (TSCs) and thyristor-controlled reactors (TCRs). In practical applications, the TCR is used in conjunction with a shunt capacitor. According to the different components of the switched capacitor, it can be divided into a static reactive power compensator used in conjunction with the TCR and a fixed capacitor, and a compensator used in combination with a TCR and a circuit breaker switching capacitor. And reactive power compensators used by TCR and TSC. The important characteristic of these combined SVCs is that it can continuously adjust the reactive power of the compensation device and perform dynamic compensation, so that the voltage at the compensation point will remain close to the same, but the SVC can only compensate the system voltage, and its reactive output and compensation The point voltage is proportional to the square of the voltage, when the voltage decreases, its compensation will weaken. The main role of SVC is voltage control. With proper control methods, SVC can also dampen system power oscillations and increase stability. At present, the SVC technology is relatively mature. In the foreign countries, SVC has been used since the 1960s. In the late 1970s, voltage control for transmission systems began. After several decades of development, not only static var compensators are used in transmission systems. The voltage control is also used for the compensation and control of the distribution system. It can also be used for reactive power compensation and voltage control of the power end user.

The requirements for future SVC devices in various fields are as follows:

1 The field of power grid construction At present, the SVC on the grid side is mainly used in 35 kV and above lines. Under different voltage levels, the capacity ratio of the reactive power compensation device and transformer installed on the grid shows the higher voltage level and the larger the ratio, the installation of 40% or so transformers. It is necessary to assemble SVC and the SVC adjustment capacity is estimated to be 15% of the transformer capacity. The market capacity of the SVC required on the grid side is about 3.8 billion yuan per year.

At present, the proportion of power grid applications is significantly smaller than that of corporate users. With the continuous increase in investment in power grid construction, the technical requirements for smart grids are continuously increasing, which also means that there is a huge increase in the demand for SVC devices in the power grid sector. In the above figure, the SVC market size is derived based on the overall investment in the second stage of the grid and is evenly allocated to the next few years. From the perspective of the national grid planning combined with the current actual situation, after 2013, it will be the concentration of large-scale market demand outbreaks. Time period.

2 The field of wind power construction According to the wind power grid-connected index proposed by the National Energy Administration, 90 million kilowatts of wind turbines will be connected to the grid by 2015. At present, the installed capacity of wind power in China is approximately 20 million kilowatts, which means that the annual average of the next five years will be To achieve 14 million kilowatts of wind turbines to achieve access to the Internet, the current capacity of reactive power compensation for wind power accounts for approximately 20%-30% of the installed capacity, and is calculated at an average of 25%. The annual SVC installations required for wind turbines are approximately 3.5 million. There is a thousand or so. Calculated at a unit price of RMB 150/kg, the annual market capacity of wind power station construction is approximately RMB 525 million.

3 Electrified Railways According to the National Medium- and Long-Term Railway Network Plan, by 2020, the country’s railway operating mileage will reach 120,000 kilometers, and the electrification rate will reach 60%, which means that by 2020, the operating mileage of national electrified railways will reach 72,000 kilometers. Usually, electrified railways require a substation every 50 kilometers. By now, the mileage of our electrified railway has exceeded 30,000 kilometers. To build 40,000 kilometers within the next ten years, 800 traction substations will be built at the same time. Substation SVC equipment cost 2.5 million calculations, the annual market capacity of 200 million yuan.

4 The metallurgy, coal mine, chemical industry and other fields accompany the deepening of China's energy conservation and emission reduction work. The country’s requirements for energy conservation of enterprises are also increasingly strict. Especially for high energy-consuming industries, specific emission reduction targets have been issued, which will prompt enterprises to actively seek for reductions. Row of measures to bring market space for SVC. Due to the large number of enterprises in the metallurgy and coal industries in China and the large market base, it is conservatively estimated that the annual market capacity will not be less than 1 billion yuan.

In the field of high-voltage static dynamic reactive power compensation, because of the high maturity of TCR technology, it is popularized early, and it occupies the vast majority in the current market. Although the application of MSVC is later than that of TCR-type SVC, it is developing rapidly and the customer recognizes it. Knowledge has risen to a higher level. As one of the important types of SVC devices, the MCR-type SVC has strong applicability to wind farms and UHV transmission lines, and in the future, the above two fields will enter a period of rapid growth. In the next few years, the MCR SVC market size Will show a faster development trend.

According to the future demand for SVC devices in different fields, the total capacity of the SVC market will remain at around RMB 5.6 billion in the future. Among them, the MCR SVC will show a trend of rapid development. The size of major SVC market in the next few years is shown in the figure below:

At present, in the high-pressure field market in China, there is no absolute dominant pattern in all aspects of TCR and MCR. Users need to select the appropriate combination of specific engineering conditions. With the development of technology and the changes in the prices of various raw materials and components, certain types of products will have relative technological and economic advantages under certain conditions of use. The advantage of TCR lies in its fast response. It is suitable for equipment that requires response time, such as electric arc furnaces. The MCR has a longer time, but it can be made into ultra-high voltage straight-hanging type. It is a better solution to solve the power frequency overvoltage, and it will be in the UHV in the future. The transmission industry has obvious advantages.