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Thyristor Controlled Series Compensation System

Series compensation is a mature technology, which is mainly used to reduce the inductive impedance of transmission lines, especially in large-capacity transmission lines. The transient and voltage stability of the transmission system can be greatly improved. A thyristor controlled series compensation system (TCSC) provides fast dynamic adjustment of the embedded reactance. At the connection point between the transmission grids, this adjustment capability can provide a strong damping torque for the electromechanical oscillations between the areas. Thus, a TCSC with a rated capacity of 100 Mvar makes it possible to interconnect power grids with several gigawatts of generating capacity. Typically, TCSC is combined with fixed series compensation to improve transient stability in a more cost-effective manner. The TCSC concept is also inherently resistant to subsynchronous resonance (SSR), so the use of series capacitors can be extended in certain transmission networks, including heat generation.

Product Description

Series compensation is a mature technology, which is mainly used to reduce the inductive impedance of transmission lines, especially in large-capacity transmission lines. The transient and voltage stability of the transmission system can be greatly improved.

A thyristor controlled series compensation system (TCSC) provides fast dynamic adjustment of the embedded reactance. At the connection point between the transmission grids, this adjustment capability can provide a strong damping torque for the electromechanical oscillations between the areas. Thus, a TCSC with a rated capacity of 100 Mvar makes it possible to interconnect power grids with several gigawatts of generating capacity. Typically, TCSC is combined with fixed series compensation to improve transient stability in a more cost-effective manner.

The TCSC concept is also inherently resistant to subsynchronous resonance (SSR), so the use of series capacitors can be extended in certain transmission networks, including heat generation.

thyristor control series compensation principle:

There are two main principles that support TCSC technology.

First, TCSC provides electromechanical damping between large electrical systems by modulating the reactance of one or more specific interconnected transmission lines. In other words, the TCSC will provide a variable capacitive reactance.

Second, the TCSC may alter its apparent impedance (as shown by the line current) for the subsynchronous frequency, thereby avoiding potential subsynchronous resonance.

TCSC achieves these two goals by using control algorithms that work simultaneously. The control may act on a thyristor circuit (in parallel with the main capacitor bank) to add a controlled charge to the main capacitor, making it a variable capacitor at the fundamental frequency and a "virtual inductor" at the subsynchronous frequency ".

 

thyristor controlled series compensation technology:

From the main technical point of view, TCSC is similar to traditional series capacitors. The power equipment is located on an insulated isolated steel platform and includes a thyristor valve, which is used to control the reactor in parallel with the capacitor bank. The reactor is placed on a supporting insulator outside the platform. The control and protection system and other auxiliary systems are located on the ground.