📋 Case Study

Chicago Transit Authority (CTA) Substation-Adjacent Facility VPP Enrollment

Utility requested participation in localized voltage support program requiring <100ms response time and reactive power injection capability

🏗️ Project Overview

CTA maintenance depot with 3.8 MW peak load adjacent to critical 345kV substation

🎯 Challenge

Utility requested participation in localized voltage support program requiring <100ms response time and reactive power injection capability

🔧 Design Approach

Hybrid BESS (2.5 MWh) + STATCOM integration with IEEE 2030.5 native control interface and substation SCADA co-simulation

📐 Design Diagram

AI-generated project design illustration

📐 Key Calculations

Reactive Power Injection Margin

Q = V × I × sin(φ)

Result: ±1.4 MVAR

Meets ComEd’s voltage support spec

Response Latency Budget

Comm Delay + Control Loop + Actuation

Result: 87 ms

Validated via hardware-in-loop testing

Enrolled in ComEd’s Local Capacity Program; earned $242K/year in capacity payments; improved local voltage stability by 0.8% RMS

💡 Lessons Learned

• •Substation SCADA co-simulation is non-negotiable for latency-critical VPPs
• •STATCOM-BESS coordination requires custom firmware logic

✅ Key Takeaways

• 1Substation SCADA co-simulation is non-negotiable for latency-critical VPPs
• 2STATCOM-BESS coordination requires custom firmware logic