ETAP vs DIgSILENT - Power Systems Planning Software

For an engineer, tools are a significant asset. Eventhough if licenses can be
shared collectively, analysis is the key. 

Based on their applications, there are two common types of power system modeling software:

1. Long-term planning modeling software :: Provides design testing and verification features for various scenarios, enabling proper planning and optimization of network operations. This first type can be further divided into three categories: 

• Power network analysis-focused (the focus of this article). 
• Energy system evolution models (accounting for energy mix changes, e.g., LEAP, TIMES, Excel). 
• Economic models (e.g., HOMER). 

2. Operational and real-time modeling software :: Serves as an interaction method for control technicians in their supervisory and management roles (e.g., SCADA, DMS, EMS). 

This article will discuss power network analysis planning platforms. Typically, these offer functionalities including: 

• Transmission systems & generator connections :: Load flow, reactive power capability, fault ride through (generator recovery after disturbances), contingency analysis, harmonic analysis,  and electromagnetic transient (EMT) simulations (to verify model accuracy in the frequency domain, often for lightning/switching/overvoltage studies and insulation coordination).
• Distribution networks :: Reverse power flow, voltage management, stability, and protection coordination. 
• Integration with real-time systems. 
• Hybrid analysis/integration with other electrical equipment. 
• Study outputs can serve as Grid/Distribution Code compliance evidence, provided input data/assumptions are sufficiently accurate. 

 

As someone with a background in Power Systems Studies, the title topic is often brought up casually. It even appears briefly in the introductory chapter of class. Hence, I’m sharing this research to keep office conversations smooth, haha! 

The Importance of Virtual Modeling 

Digitalization in power systems relies on virtual models that simulate real-world behavior and characteristics. Each tool has unique algorithms, features, and traits.  

Since reading ≠ doing, I validated findings through observation and experience. It should be noted that the comparison refers to ETAP 20 and DIgSILENT PowerFactory 2021 versions. Here’s my conclusion: 

Three Categories of Power Network Analysis Software

1. Large scale system modeling :: For users whose primary work involves simulation and modeling. These offer advanced frequency-domain modeling but sacrifice user-friendliness (e.g., PowerWorld [supports 250,000 buses], PSS SINCAL, IPSA). 

2. Occasional use programs :: Designed for simpler interfaces at the cost of advanced modeling (e.g., ETAP, EDSA, PSS/E, NEPLAN, CYME [ref. 5 notes its power], ERACS, EZPower, SKM [claims 90% US user adoption]). 

3. Generic differential equation simulators :: Ideal for detailed equipment behavior modeling (e.g., MATLAB Simulink, PSCAD). Larger grids are represented via simplified components. 

 

 ETAP vs. DIgSILENT: Key Comparisons 

1. Advanced Modeling :: DIgSILENT excels in small-signal stability & EMT for transmission systems (eigenvalue plotting, system stability checks). ETAP lacks this. DIgSILENT also supports distributed cable models (vs. ETAP’s PI model).