Definition
A system for supplying and consuming electrical energy that combines generation, voltage transformation, transmission, distribution, protection, and dispatch.
The power grid turned generators from individual machines into a public system. Modern grids are bringing photovoltaics, energy storage, electric transport, and digital control into the same problem of balancing supply and demand.
Principles and impact
Problems solved
- Connected dispersed energy sources and generators to distant loads.
- Balanced generation and consumption through voltage transformation, synchronization, and dispatch.
Principles
- Generation, transmission, distribution, and end-use loads are connected through substations and lines.
- The system must maintain voltage, frequency, protection, and the balance between supply and demand.
Improvements
- Compared with on-site generation, networked systems expanded the choice of energy sources and the area served.
Significance
- Became shared energy infrastructure for industry, transport, information systems, and modern life.
History and applications
People
Thomas Edison、Nikola Tesla、George Westinghouse
Organizations
Edison Electric Illuminating Company
Events
Pearl Street central power station begins operation in 1882
Applications
Urban lighting and factory power、Railways and electric transport、Data centers and communications networks
Limitations
- Supply and demand must be balanced in real time, while lines, transformers, protection, and communications are coupled in complex ways.
Upstream and downstream relations
Upstream
Sources: Life of Thomas Alva EdisonUnited States Electricity Industry Primer
Sources: Solar Achievements TimelineSolar Integration: Inverters and Grid Services Basics
Downstream
Sources: United States Electricity Industry PrimerSolar Integration: Inverters and Grid Services Basics