Application of active filtering and reactive power compensation

Yuyang Yuanchuang Electric Co., Ltd. is a ten-year old factory specializing in the production and sales of electrical compensation equipment. It insists on making high-quality products to contribute to the national electrical industry.
Yuyang Yuanchuang Electric Co., Ltd. is a ten-year old factory specializing in the production and sales of electrical compensation equipment. It insists on making high-quality products to contribute to the national electrical industry.


At present, in Japan, the United States and Europe, low-voltage medium and small power APF has been widely used in industrial and civil equipment, the capacity of its stand-alone devices is gradually increasing, and the number of harmonic compensation is gradually increasing. Up to 25th harmonic. The medium-voltage and large-capacity APF has also been applied in specific applications. For example, in the harmonic control of the Shinkansen power supply system in Japan, the capacity of the APF has reached 48 MVA. In China's application research on APF, there is still a gap compared with developed countries. The large-capacity non-linear power electronic devices and large-capacity impact loads widely used by factories and mines not only inject a large amount of harmonics into the medium-voltage grid, but also absorb a large amount of reactive power. Therefore, in transmission and distribution projects, it is often required to simultaneously suppress harmonics and compensate reactive power. Solving the key problems of medium-voltage and large-capacity industrial equipment with reactive power compensation and harmonic suppression in practical applications, in line with the national demand for major technologies for power transmission and distribution power electronics

APF active filtering is gaining more and more attention and application because of its superior compensation harmonic performance and small influence on grid impedance.



The composition of APF active filter compensation device

The high-voltage APF mainly adopts a cascade structure, which is formed by cascading single-phase full-bridge inverters composed of IGBTs, and the number of cascaded units is jointly determined according to the grid voltage level and the DC-side voltage value of the unit. The principle is shown in Figure 2.

The 10kV APF is cascaded in 10 units per phase, and the Y-connection between the three phases is directly connected to the 10kV grid system via the reactor. The control system mainly implements functions of detection, protection and driving.

The 10kV cascading APF cabinets are arranged in layers above and below. The entire cabinet is separated before and after the space. The middle is insulated with insulating material, leaving the radiator outlet of each unit, forming a duct in the rear half of the cabinet. The fan is concentrated and exhausted, and the air pressure difference is formed before and after the cabinet body, forming an independent air passage of the radiator of each unit to achieve heat dissipation.
The company relies on Wuhan University's rich experience and leading technology in high-power power electronics in active filter harmonic control, and is committed to power quality optimization and research and development of photovoltaic inverters and new energy products. Better quality products and services.

Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn

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