SVG + TSC (Thyristor-Switched Capacitor) Hybrid Compensation System

The combination of a Static VAR Generator (SVG) and Thyristor-Switched Capacitor (TSC) creates a high-performance hybrid reactive power compensation system. This setup leverages the fast dynamic response of the SVG with the cost-effective bulk compensation capability of TSC.

How SVG + TSC Works

1. SVG (Static VAR Generator)

   • Uses a voltage-source converter (VSC) with IGBTs for instantaneous reactive power control (both capacitive and inductive).

   • Provides continuous, smooth, and fast (millisecond-level) reactive power adjustment.

   • Ideal for dynamic compensation (flicker mitigation, voltage sag/swell correction, and transient stability).

2. TSC (Thyristor-Switched Capacitor)

   • Consists of capacitor banks switched step-wise using thyristors (SCRs).

   • Provides bulk reactive power at a lower cost compared to full SVG capacity.

   • Switching occurs at zero-voltage crossing to minimize transients.

   • Slower than SVG (typically 1-2 cycles for switching) but more economical for large reactive power needs.

Control Strategy

• The SVG handles fast, fine adjustments to maintain voltage stability and power factor.

• The TSC provides coarse compensation, switching in/out capacitor banks as needed.

• A central controller coordinates both devices to ensure seamless operation.

Advantages of SVG + TSC Hybrid System

✔ Cost-Effective: Reduces the required SVG capacity (since TSC handles bulk compensation).
✔ Fast & Dynamic: SVG compensates for rapid load changes while TSC supports steady-state needs.
✔ High Efficiency: SVG operates only for fine-tuning, reducing losses.
✔ Scalable: Additional TSC banks can be added for growing reactive power demands.
✔ Improved Reliability: SVG can compensate during TSC switching delays.

Applications

• Industrial plants (steel mills, arc furnaces, mining) with highly variable loads.

• Renewable energy integration (solar/wind farms needing dynamic VAR support).

• Electric railways (compensating for traction load fluctuations).

• Data centers & critical facilities (ensuring voltage stability).

Comparison: SVG vs. TSC vs. SVG + TSC

The SVG + TSC hybrid system offers a balanced solution for applications requiring both fast dynamic response and cost-effective bulk compensation. It is particularly useful in industries with highly fluctuating loads or renewable energy systems needing reactive power support.

Would you like details on a specific application or control algorithm for this hybrid system? sales@yt-electric.com