1. Renewable Energy Systems and Multi-Energy Integration:
Solar power generation
Wind energy conversion
Biomass thermochemical conversion
Geothermal utilization
Hydrogen-based energy system
Ammonia-based energy system
Fuel cell optimization
Multi-energy complementarity
Renewable energy forecasting
Nanomaterial application in clean energy

3. Electrical Technologies for Renewable Energy Integration:
Renewable grid integration
Grid stability control
Power quality enhancement
Harmonic mitigation
Converter control
Smart inverter coordination
Protection scheme design
Fault detection
Data-driven control
Microgrid operation
Cyber-physical systems in power grid
Edge computing for real-time grid control
Distributed control architecture
Communication-aware protection strategy
IoT-based renewable energy monitoring

2. Energy Conversion and Intelligent Energy Technologies:
Energy conversion modeling
Energy storage structure design
Electrochemical energy storage
Energy management strategy
Multi-energy scheduling
Building energy optimization
Demand-side efficiency management
Energy internet architecture
Carbon-neutral system design
Intelligent algorithm application
Energy big data analytics
AI-driven load prediction
Intelligent fault diagnosis
Digital twin in energy systems
Reinforcement learning in energy dispatch