In the context of STATCOM (Static Synchronous Compensator), the choice between a Delta (Δ) connection and a Star (Y) connection depends on several factors. Here are some considerations:

Voltage Level:

Delta connection is typically used for high or medium voltage systems, while Star connection is more commonly used for low and medium voltage systems. The choice depends on the voltage range of the system where the STATCOM(Many people call Statcom as high votlage Static Var Generator SVG) is being installed.

System Configuration:

The system configuration and the existing network impedance also play a role in choosing the connection. It is important to analyze the characteristics of the system and understand the impact of STATCOM connection on network stability, power flows, and fault handling capability.

Grounding Requirements:

If the system requires a solid ground, a Delta connection may not be suitable as it lacks a neutral point. In this case, a Star connection with a solid neutral point may be preferred.

Control Strategy:

The control strategy of the STATCOM(SVG) may also influence the choice of connection. Some control algorithms are more suitable for Delta connection, while others are more compatible with Star connection. The control scheme must be designed in such a way that it can effectively control the reactive power flow and maintain system stability.

Component Availability and Cost:

The availability and cost of the required STATCOM(SVG) components for each connection type may also be a consideration. It is important to compare the availability, cost, and reliability of components such as reactors, capacitors, and power electronic devices for both Delta and Star connections.

System Performance Requirements:

The performance requirements of the system, such as voltage regulation, power factor correction, and harmonic mitigation, need to be considered. Both Delta and Star connections have different effects on these performance parameters, and the choice should be made to meet the specific requirements of the system.

It is crucial to consult with electrical engineers and system designers experienced in STATCOM(SVG) applications to make an informed decision on whether to use a Delta or Star connection. The specific characteristics of the power system, the technical requirements, and the long-term goals of the project should be taken into account before making a decision.