Static Compensator Branches: TCR & TSC

As seen in the introduction to this chapter, the static compensator model consists of a control system and a power component. The latter has 4 three-phase branches, each with the same configuration, as shown in Figure 11 - 20. The model presents a configuration with one TCR inductive branch and three TSC capacitive branches. However, the user may want to build their own static compensator model with a different configuration. They can then use the static compensator branch model with an external control. which they can program themselves. Both types of branches are available to the user: the TCR inductive branch (TCR or thyristor-controlled reactor) and the TSC capacitive branch (TSC or thyristor-switched capacitor). Essentially, both of these models are identical, the TCR branch being a specific case of the TSC branch.
These models are built-in and do not add nodes (or increase the Z matrix).

Icons and Diagrams of TCR and TSC Static Compensators

Parameters

The parameters for both types of static compensator are identical to those shown in section 11.2.1.
List of Available SIgnals

• CMD12phase_label: Firing pulse in the positive valve;
• CMD21phase_label: Firing pulse in the negative valve;
• Iphase_label: Current across the branch;
• STATE12phase_label: State of the positive valve;
• STATE21phase_label: State of the negative valve;
• VCAPphase_label: Voltage across the capacitor (volt);
• DelayImpInt_ label: Firing delay (as a fraction of calculation step) calculated by the internal command (not used)
• DelayImpExt_ label: Firing delay (as a fraction of calculation step) calculated by an external command
• DelayImp_ label: Firing delay (as a fraction of calculation step) sent to the valves
• DelayImpUsed_ label: Firing delay (as a fraction of calculation step) used

The signals are the same for both types of branches. Of course, the voltage across the capacitor of the TCR inductive branch will always be null.

Control Panels of TCR and TSC Static Compensators
Figures 11 - 30 and 11 - 31 show respectively the TCR inductive branch and TSC capacitive branch control panels.

This example shows the use of a static compensator branch and is very similar to the static compensator model described previously. The network in Figure 11 - 32 is identical to that in
Figure 11 - 26, the only difference being in the static compensator. In this case, the power component is simulated with static compensator branches and the control system with a HyperLink block. The static compensator being simulated consists of two TSC capacitive branches and one TCR inductive branch. The powers of the branches are identical to those of the static compensator in the preceding example.
The same test is made, a voltage ramp of 0.75 to 1.25 pu over 10 seconds. The results of the test are shown in Figure 11 - 33.

U-I Dynamic Curve of the Static Compensator