Electrisim Backend API

About

This repository contains the backend API server for Electrisim - an open-source web-based application for comprehensive power system modeling, simulation, and analysis. The backend provides REST API endpoints for power system calculations and simulations using industry-standard libraries.

🌐 Online Application: app.electrisim.com
📁 Frontend Repository: Frontend Code

Features

The Electrisim backend provides computational engines for:

• Power Flow Analysis
• Optimal Power Flow (OPF)
• Short-Circuit Analysis
• Contingency Analysis
• Controller Simulation
• Time Series Simulation

Technology Stack

• Framework: Flask (Python web framework)
• Simulation Engines:
  • pandapower - Primary power system analysis library
  • OpenDSS - Alternative simulation engine via py-dss-interface
• Scientific Computing: NumPy, SciPy, pandas
• Web Server: Gunicorn (production WSGI server)
• Testing: pytest
• Deployment: Heroku/Render ready with Procfile

Architecture

├── app.py                          # Main Flask application and API routes
├── pandapower_electrisim.py        # pandapower simulation engine wrapper
├── opendss_electrisim.py          # OpenDSS simulation engine wrapper
├── requirements.txt               # Python dependencies
├── Procfile                      # Heroku/Render deployment configuration
├── runtime.txt                   # Python version specification
└── test_*.py                     # Test suites for various components

Prerequisites

Before deploying the Electrisim backend, ensure you have:

• Python 3.9.18 (specified in runtime.txt)
• pip (Python package manager)
• Git (version control)
• Virtual Environment tools (venv or virtualenv)

Step-by-Step Deployment Guide

1. Clone the Repository

git clone <repository-url>
cd appElectrisimBackend

2. Create Virtual Environment

# Create virtual environment
python -m venv .venv

# Activate virtual environment
# On Windows:
.venv\Scripts\activate
# On macOS/Linux:
source .venv/bin/activate

3. Install Dependencies

pip install -r requirements.txt

4. Local Development Setup

Run Development Server:

# Set Flask environment variables
export FLASK_APP=app.py
export FLASK_ENV=development

# Run the application
flask run

# Or run directly with Python
python app.py

The server will start on http://localhost:5000 by default.

Test the API:

# Test basic connectivity
curl http://localhost:5000/

# Test API endpoint (requires JSON data)
curl -X POST http://localhost:5000/ \
  -H "Content-Type: application/json" \
  -d '{"test": "data"}'

5. Production Deployment

Option A: Heroku Deployment

1. Install Heroku CLI and login:

heroku login

2. Create Heroku application:

heroku create your-electrisim-backend

3. Deploy to Heroku:

git add .
git commit -m "Deploy to Heroku"
git push heroku main

4. Configure environment variables:

heroku config:set FLASK_ENV=production
heroku config:set FLASK_APP=app.py

Option B: Render Deployment

1. Connect Repository: Link your GitHub repository to Render

2. Configure Build Settings:

   • Build Command: pip install -r requirements.txt
   • Start Command: gunicorn app:app
   • Environment: Python 3.9.18

3. Deploy: Render will automatically deploy from your repository

Option C: Self-Hosted Server

1. Install system dependencies:

# Ubuntu/Debian
sudo apt update
sudo apt install python3.9 python3-pip python3-venv nginx

# CentOS/RHEL
sudo yum install python39 python3-pip nginx

2. Setup application:

# Clone and setup
git clone <repository-url> /opt/electrisim-backend
cd /opt/electrisim-backend
python3 -m venv .venv
source .venv/bin/activate
pip install -r requirements.txt

3. Create systemd service (/etc/systemd/system/electrisim-backend.service):

[Unit]
Description=Electrisim Backend API
After=network.target

[Service]
User=www-data
Group=www-data
WorkingDirectory=/opt/electrisim-backend
Environment=PATH=/opt/electrisim-backend/.venv/bin
ExecStart=/opt/electrisim-backend/.venv/bin/gunicorn --workers 3 --bind 127.0.0.1:5000 app:app
Restart=always

[Install]
WantedBy=multi-user.target

4. Configure Nginx reverse proxy:

server {
    listen 80;
    server_name your-backend-domain.com;
    
    location / {
        proxy_pass http://127.0.0.1:5000;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }
}

5. Start services:

sudo systemctl enable electrisim-backend
sudo systemctl start electrisim-backend
sudo systemctl reload nginx

6. SSL/HTTPS Configuration

For production deployments, configure SSL:

# Using Certbot (Let's Encrypt)
sudo certbot --nginx -d your-backend-domain.com

7. Environment Configuration

CORS Settings

The backend is configured to accept requests from:

• Development: localhost:5500, localhost:5501, 127.0.0.1:5500, 127.0.0.1:5501
• Production: app.electrisim.com, www.electrisim.com, electrisim.com

Update CORS origins in app.py if deploying to different domains.

Environment Variables

# Production settings
export FLASK_ENV=production
export FLASK_APP=app.py

# Optional: Database configuration (if using database)
export DATABASE_URL=your_database_url

# Optional: API keys for external services
export API_KEY=your_api_key

API Documentation

Base URL

• Development: http://localhost:5000
• Production: https://your-backend-domain.com

Endpoints

GET /

Description: Health check endpoint
Response: "Please send data to backend"

POST /

Description: Main simulation endpoint
Content-Type: application/json

Request Body Structure:

{
  "simulationType": "powerflow|shortcircuit|contingency|timeseries",
  "elements": {
    "element_id": {
      "typ": "element_type",
      "name": "element_name",
      "parameters": {...}
    }
  },
  "settings": {
    "solver": "pandapower|opendss",
    "tolerance": 1e-6,
    "max_iteration": 100
  }
}

Response Structure:

{
  "success": true,
  "results": {
    "busbars": [...],
    "lines": [...],
    "transformers": [...],
    "generators": [...],
    "loads": [...]
  },
  "convergence": true,
  "iterations": 5
}

Simulation Types

1. Power Flow Analysis

   • Steady-state AC power flow
   • Voltage and power calculations
   • Loss analysis

2. Short Circuit Analysis

   • Three-phase fault calculations
   • Line-to-ground faults
   • Protection coordination

3. Contingency Analysis

   • N-1 security assessment
   • Critical element identification
   • System stability evaluation

4. Time Series Simulation

   • Load profile analysis
   • Renewable integration studies
   • Dynamic system behavior

Testing

Run Test Suite

# Run all tests
pytest

# Run specific test files
pytest test_pandapower.py
pytest test_opendss.py

# Run with coverage
pytest --cov=. --cov-report=html

Test Files Overview

• test_numeric_conversion_fix.py - Data validation tests
• test_transformer_parallel_fix.py - Transformer modeling tests
• test_busbar_count.py - Bus system validation
• test_voltage_and_generator_fixes.py - Voltage calculation tests
• test_comprehensive_fixes.py - Integration tests

Dependencies

Core Dependencies

• Flask 2.2.2 - Web framework
• Flask-CORS 3.0.10 - Cross-origin resource sharing
• pandapower 2.14.11 - Power system analysis
• py-dss-interface 2.0.4 - OpenDSS integration
• numpy 1.23 - Numerical computing
• pandas 2.1.4 - Data manipulation
• scipy 1.11.4 - Scientific computing

Production Dependencies

• gunicorn 20.1.0 - WSGI HTTP server

Development Dependencies

• pytest 7.4.3 - Testing framework

Troubleshooting

Common Issues

1. Import Errors:

   # Ensure all dependencies are installed
   pip install -r requirements.txt
   
   # Check Python version
   python --version  # Should be 3.9.18
   

2. CORS Issues:

   • Verify frontend URL is in CORS origins list in app.py
   • Check that requests include proper headers

3. Simulation Errors:

   • Validate input data format
   • Check pandapower/OpenDSS installation
   • Review error logs for specific issues

4. Performance Issues:

   • Consider increasing Gunicorn workers
   • Monitor memory usage for large networks
   • Implement caching for repetitive calculations

5. Deployment Issues:

   # Check logs
   heroku logs --tail  # For Heroku
   
   # Verify environment variables
   heroku config  # For Heroku
   
   # Test locally first
   gunicorn app:app --bind 0.0.0.0:5000
   

Development

Project Structure

appElectrisimBackend/
├── app.py                          # Flask application entry point
├── pandapower_electrisim.py        # pandapower simulation wrapper
├── opendss_electrisim.py          # OpenDSS simulation wrapper
├── requirements.txt               # Python dependencies
├── runtime.txt                   # Python version for deployment
├── Procfile                      # Process configuration for cloud deployment
├── test_*.py                     # Test suites
└── README.md                     # This file

Adding New Features

1. Create feature branch:

git checkout -b feature/new-analysis-type

2. Implement changes: