A Virtual Power Plant (VPP) aggregates geographically distributed generators, storage systems, and flexible consumers into a coordinated asset pool. This enables the available flexibility to be planned, controlled, and used in energy or flexibility markets.

VPP at a Glance

• A VPP can connect PV systems, BESS, wind turbines, combined heat and power units, generators, charging infrastructure, and flexible consumers.
• A central platform processes measurements, forecasts, and operating limits to generate schedules or power setpoints.
• Depending on the system architecture, local energy management systems (EMS), plant controllers, gateways, or direct device interfaces implement the setpoints.
• VPPs, EMS, aggregators, and direct marketers perform different technical or market-related functions.

How Does a Virtual Power Plant Work?

The connected assets transmit measurements, availability data, power limits, states of charge, and forecasts to the VPP platform. The platform evaluates the flexibility of the asset pool and creates schedules or distributes external power requests among suitable sites.

For BESS, operational planning considers factors such as state of charge, available charging and discharging power, efficiency, reserves, degradation, and existing market commitments. Depending on the business model, the asset pool can support direct electricity marketing, trading on day-ahead or intraday markets, and the provision of balancing services.

Depending on the technical architecture, setpoints are transmitted through local EMS, plant controllers, gateways, or direct device interfaces. The assets then report their actual response. Local limit checks and defined fallback strategies prevent unsafe operating conditions in the event of invalid setpoints or communication failures.

Typical Applications of a VPP

VPPs are primarily used for the joint marketing of distributed generation, the provision of balancing services, and the market-oriented operation of BESS. Charging infrastructure and industrial consumers can also be integrated if their power demand is reliably predictable and controllable.

Energy Sharing can be combined with VPP structures but remains a separate concept. While Energy Sharing describes the shared use or allocation of energy, a VPP coordinates the flexibility of an asset pool.

Benefits, Limitations, and Requirements

A VPP can aggregate smaller sources of flexibility and make them available for applications that individual assets could not support economically or technically. This requires reliable measurements, suitable communication interfaces, controllable components, and clearly defined operating limits.

The possible applications depend on the available flexibility, data quality, and applicable market requirements. Depending on the market, country, and participant role, additional contracts, approvals, partnerships, or prequalification processes may be required.

Distinction Between VPP, EMS, Aggregator, and Direct Marketer

A VPP typically coordinates an asset pool across multiple sites. In contrast, a local EMS controls energy flows within an individual site while considering its technical operating limits.

An aggregator combines assets or sources of flexibility and coordinates their joint deployment. A direct marketer is primarily responsible for marketing the generated electricity. Depending on the business model, additional tasks such as balancing or prequalification may be performed by these or other market participants.

Technical VPP Integration with EcoPhi

EcoPhi can serve as a local EMS and communication layer between a VPP platform and the assets at a site. The system can monitor PV systems, BESS, meters, generators, and flexible consumers, provide availability data, and distribute external schedules or power setpoints.

Technical limits, states of charge, backup power reserves, and site-specific priorities can be considered. The exact functionality depends on the available device interfaces and project requirements. EcoPhi does not automatically assume responsibility for aggregation, energy trading, or balancing.

Conclusion

A VPP combines distributed assets into a coordinated pool but requires reliable data, controllable components, and suitable market partners.

Frequently Asked Questions

What Is the Difference Between a VPP and an EMS?

A VPP typically coordinates assets across multiple sites. A local EMS controls energy flows and technical components within an individual site.

Is a VPP Automatically a Direct Marketer?

No. A VPP describes the technical aggregation and coordination of an asset pool. Electricity marketing is handled by a direct marketer or another appropriately authorised market participant.