What is STATCOM and its application?

Static synchronous compensator (STATCOM) is the core of flexible AC transmission system. This article will introduce the Static synchronous compensator and summarize the application and development status of the Static synchronous compensator.

The following is a list of contents

• What is Static synchronous compensator

• Application of Static synchronous compensator

  
  

  
  

What is Static synchronous compensator

Static synchronous compensator (STATCOM) is a facts device of parallel reactive power compensation. It can emit or absorb reactive power, and its output can be changed to control specific parameters in power system; Generally, it is a solid-state switching converter. When its input end is connected with a power supply or energy storage device, its output end can independently send out or absorb controllable active and reactive power; It can improve the functions of power system in the following aspects: dynamic voltage control, power oscillation damping, transient stability, voltage flicker control and so on.

The Static synchronous compensator adopts a new generation of power electronic devices, such as gate turn off thyristor (GTO), insulated gate bipolar transistor (IGBT), integrated gate commutation thyristor (IGCT), and adopts modern control technology. Its role in the power system is to compensate reactive power, improve system voltage stability and improve system performance. Compared with the traditional reactive power compensation device, STATCOM has the advantages of continuous regulation, small harmonic, low loss, wide operation range, high reliability and fast regulation speed. Since its inception, STATCOM has received extensive attention and rapid development.

Application of Static synchronous compensator

The concept of STATCOM was put forward in the 1980s, and its practical application is mainly concentrated in the 1990s. Due to the high technical content of STATCOM, Japan, the United States, Germany, the United Kingdom, China and other countries master and apply this technology. The first STATCOM in China was jointly developed by Tsinghua University and Henan Electric Power Bureau from 1994 to 1999. It has been put into operation in Chaoyang substation in Luoyang City, Henan Province in March 1999. For this technology, in 2007, Luo an of Hunan University and others applied for a national patent for the coordinated control method of power quality regulator based on STATCOM and SVC, and Guo Yuhua and others applied for a national patent for the control method of STATCOM.

The application engineering of STATCOM usually includes: in the selection of power semiconductor devices, most of them are based on GTO and IGBT; In the main circuit, high-capacity and high-voltage STATCOM mainly adopts transformer coupling multiple technology, and dsatcom with medium and low capacity and voltage mostly adopts three-level and / or PWM converter; VSC is basically adopted; Diversification of system control objectives; Large capacity STATCOM mostly adopts water cooling mode and other characteristics.

According to incomplete statistics, since the first high-capacity STATCOM device came out, more than 20 high-capacity (10 Mvar and above) STATCOM projects have been put into operation all over the world, with a total controllable capacity of more than 3000 Mvar. Some of them are installed in the transmission network for power flow control, reactive power compensation and improving system stability, which belong to the category of facts; Some are installed in distribution and power consumption networks to improve power quality and improve power supply reliability. They belong to the category of user power, that is, D-STATCOM of user power controller. The main circuit of STATCOM has gradually developed from the initial coupling of switching devices to the series use of multiple switching devices. Combined with VSI, NPC structure is adopted and PWM is used for control, so that the STATCOM device has more stable and excellent performance.

Zhuhai Sinopak Electric Ltd. provides high-quality STATCOM. If you are interested in our products, please contact us:daniel.wu@sinopakelectric.com.

You can visit us at https://www.powerqualitystatcom.com/