Photovoltaic (PV) power stations, though universally designed to generate electricity from sunlight, can be categorized into three distinct types based on their grid connection points and functional roles:
Centralized PV Power Stations (Generation-Side)
These are large-scale installations typically built in deserts or barren lands, often within renewable energy bases. Their primary role is bulk electricity production. Key features include:
Fluctuation Smoothing: Integrated with large-scale energy storage systems to store excess power during peak generation periods (e.g., midday) and release it during high demand periods (e.g., evenings), reducing curtailment ("弃光").
Grid Support: Provide grid frequency and voltage regulation to ensure stable power delivery, meeting strict grid compliance requirements.
Energy Time-Shifting: Utilize time-of-use electricity pricing to store energy during low-price periods and supply it during high-price periods, enhancing economic returns.
Grid-Side Supporting PV Power Stations (Grid-Side)
Located at critical grid nodes (e.g., near substations), these stations focus on stabilizing the power system rather than mere generation:
Peak Shaving and Valley Filling: Store solar energy during low-demand periods and discharge it during peak demand, reducing reliance on fossil-fuel-based peaking plants.
Frequency and Voltage Regulation: Respond within milliseconds to grid anomalies (e.g., frequency dips or voltage drops), acting as "first responders" for grid stability.
Emergency Backup: Form microgrids with storage to supply power during grid outages, ensuring critical facilities (e.g., hospitals) remain operational.
Distributed PV Power Stations (User-Side)
Installed on rooftops of homes, factories, or commercial buildings, these systems prioritize user-side benefits:
Electricity Cost Reduction: Offset high peak-time electricity prices by generating and consuming solar power locally, often combined with small-scale storage for nighttime use.
Emergency Backup: Provide uninterrupted power to critical loads during grid failures.
Demand Response Participation: Earn incentives by reducing grid consumption during peak periods while leveraging self-generated solar power.
Self-Consumption Optimization: Maximize the use of self-generated electricity through storage, minimizing reliance on low-value grid feed-in.
These three types of PV stations-centralized (focused on bulk generation), grid-side (focused on grid stability), and distributed (focused on user savings)-collectively enhance the reliability, efficiency, and economics of solar power integration. Together, they form a synergistic framework that supports large-scale clean energy production, grid resilience, and end-user benefits.
