PowerTrack PPC

PowerTrack EMS and PPC user interface

PowerTrack Power Plant Controller (PPC)

Stay compliant at the point of interconnection, and keep every megawatt earning

PowerTrack PPC turns commands from the utility, TSO, or optimizer into precise, sub-cycle control of your PCS and PV inverters. Your plant meets grid code in every control mode while capturing every revenue opportunity. It’s VDE-certified and built into PowerTrack EMS.

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<1 cycle Control execution
99.99% Controller uptime
12+ Control modes across frequency, voltage, power, and system control
VDE-certified NC RfG (EU 2016/631) compliant
950+ Active projects under management with 98% on track

Architecture

The link between dispatch and your equipment

Every dispatch signal passes through the PPC. It takes setpoints prioritized by PowerTrack EMS, measures what is happening at the point of interconnection, and adjusts PCS and inverter output until the two match.

Standalone BESS

PowerTrack architecture for a storage-only site: PowerTrack Cloud sends controls to PowerTrack EMS and PPC, which take data from Dispatch and Meters and control two battery systems, each through its own Unit Controller and PCS.

Hybrid PV + BESS

PowerTrack architecture for a hybrid solar and storage site: PowerTrack Cloud sends controls to PowerTrack EMS and PPC, which take data from Dispatch, Meters and a Met Station and control a battery system through a Unit Controller and PCS, and a solar array through a Data Logger and PV Inverter.

Standalone PV

PowerTrack architecture for a solar-only site: PowerTrack Cloud sends controls to PowerTrack SCADA and PPC, which take data from Dispatch, Meters and a Met Station and control two PV inverters directly, with one shared Data Logger collecting data from both.

Above the PPC

Dispatch and scheduling

Commands from the utility, TSO, ISO, or optimizer flow through the scheduling entity to PowerTrack EMS, which prioritizes setpoints and control modes. PowerTrack Cloud provides portfolio visibility and remote configuration.

PPC

Closed-loop control at the point of interconnection

PowerTrack PPC reads revenue meters at the POI and continuously corrects plant output to hit the target.

Below the PPC

Field equipment

Unit controllers, PCS and battery systems execute PPC commands and report telemetry back.

Above the PPC

Dispatch and scheduling

Commands from the utility, TSO, ISO, or optimizer flow through the scheduling entity to PowerTrack EMS, which prioritizes setpoints and control modes. PowerTrack Cloud provides portfolio visibility and remote configuration.

PPC

Closed-loop control at the point of interconnection

PowerTrack PPC reads revenue meters at the POI and continuously corrects plant output to hit the target.

Below the PPC

Field equipment

PV inverters, PCS, unit controllers and battery systems are coordinated as a single plant.

Above the PPC

Dispatch and scheduling

Commands from the utility, TSO, ISO, or optimizer flow through the scheduling entity to PowerTrack EMS, which prioritizes setpoints and control modes. PowerTrack Cloud provides portfolio visibility and remote configuration.

PPC

Closed-loop control at the point of interconnection

PowerTrack PPC reads revenue meters at the POI and continuously corrects plant output to hit the target.

One platform. No handoff.

PowerTrack EMS and PPC run on a single computing platform, reducing signal latency and eliminating inter-device communication dependencies. Hot-standby redundancy with automatic failover is available.

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Control performance

Built for the speed and precision interconnection demands

Grid operators judge your plant at the point of interconnection, cycle by cycle. PowerTrack PPC is engineered to respond as fast as the grid does.

  • Sub-cycle execution

    Control actions execute in less than one grid cycle.

  • High-speed closed-loop control

    Continuously measures at the POI and corrects plant output, coordinating multiple control modes at the same time.

  • Independent inverter control

    Manages each inverter individually to handle complex site topologies and mixed equipment.

  • Remote PID tuning

    Tune control loops remotely with live visual feedback, cutting time on site during commissioning.

  • Standardized data model

    IEEE 1815.2 scheduling with support for DNP3, Modbus, OPC-UA, IEC 61850 and IEC 60870.

  • Built-in reliability

    Hot-standby EMS/PPC with automatic failover, UPS-backed power and field-proven industrial hardware (Advantech UNO-137 or SEL 3355).

Control Modules

PowerTrack PPC features 12 comprehensive control modes designed to optimize energy storage and grid integration, with ongoing development of additional modes to meet evolving market requirements. These modes are categorized into Frequency Management, Voltage Management, Power Management, System Control, and Hybrid Control, providing flexible and efficient operation for various grid scenarios.

Control Mode Description Market Application & Revenue Opportunity
Fast Frequency Response (FFR) Frequency Containment Reserve (FCR) - Primary Frequency Control

Reacts within milliseconds to grid frequency deviations, injecting or absorbing power to rapidly stabilize the grid during sudden changes.

Enhanced interconnection terms and capacity payments.

North America (NA): High-value FFR services and primary frequency response revenues.

Europe (EU): FCR market participation with premium pricing for fast response.
Frequency Watt Control Primary Frequency Control or Frequency Response

Automatically adjusts active power output based on grid frequency, modulating power to help restore balance and enhance grid resilience.

Configurable response characteristics for optimal market participation.

NA: Frequency regulation and grid support service revenues.

EU: Primary frequency response markets and grid balancing service revenues.
Power Oscillation Damping

Detects and mitigates power system oscillations by dynamically adjusting power output, improving system reliability during transient events.

Reduced curtailment risk through improved grid performance.

NA: Grid stability services and enhanced interconnection value.

EU: Grid stability compensation and service premiums.
Automatic Voltage Regulation (AVR)

Maintains voltage levels within specified limits through continuous monitoring and reactive power adjustment at point of interconnection.

Enhanced grid interconnection terms and capacity benefits.

NA: Voltage support services and reactive power compensation.

EU: Voltage control services and reactive power markets.
Volt-VAR Control Reactive Power-Voltage Control or Q(U) Control

Dynamically compensates for reactive power based on voltage levels, following predefined curves to maintain optimal voltage profiles.

Improved power factor and reduced demand charges.

NA: Enhanced voltage support services and distribution compensation.

EU: Dynamic reactive power services and voltage quality premiums.
VAR Control Reactive Power Control or Q Control

Provides constant reactive power support to the grid, addressing known reactive power deficiencies at specific network locations.

Long-term service agreements and predictable revenue streams.

NA: Steady reactive power compensation and grid support revenues.

EU: Reactive power market participation and grid service contracts.
Active Power Limiting Active Power Curtailment

Caps active power output at specified levels, managing grid constraints and complying with interconnection agreements.

Optimized interconnection capacity and reduced upgrade costs.

NA: Higher capacity factors through intelligent curtailment management.

EU: Constraint management services and congestion relief compensation.
Fixed Power Factor Constant Cos φ Control

Maintains constant power factor by balancing active and reactive power output to meet grid requirements and operational needs.

Reduced penalties and improved operational efficiency.

NA: Power quality compliance and enhanced interconnection terms.

EU: Power quality services and grid code compliance benefit.
Dispatch Regulation Reserve Automatic Frequency Restoration Reserve (aFRR) - Secondary Frequency Control

Participates in regulation services by following external dispatch signals, providing automatic frequency restoration capabilities.

High-frequency trading opportunities and margin capture.

NA: Regulation market participation and real-time energy market access.

EU: aFRR market revenues through automated dispatch response.
Automatic Generation Control (AGC) Manual Frequency Restoration Reserve (mFRR) - Tertiary Frequency Control

Integrates with grid control systems by responding to AGC signals from system operators for grid balancing support.

Grid operator preferred status and enhanced dispatch priority.

NA: AGC market participation and regulation service revenues.

EU: mFRR market access and tertiary control revenues.
SOC Waypoint SOC Scheduling

Enables operators to set specific SOC targets at future times with automatic charge/discharge management to meet scheduled requirements.

Reduced market penalties and improved bidding accuracy.

NA: Optimized positioning for scheduled energy delivery and commitments.

EU: Precise Day-Ahead commitments and scheduled grid services.
Capacity Firming

Actively compensates for PV output variability by continuously adjusting BESS discharge to hold the combined plant output at the desired POI setpoint.

Contracted capacity value and improved dispatch predictability.

NA: Capacity contract compliance and reduced curtailment risk under variable irradiance conditions.

EU: Firm capacity market participation and enhanced grid connection terms for hybrid asset.
Curtailment Recapture

Captures surplus PV generation that would otherwise be curtailed or clipped by redirecting it to charge the BESS, while the plant-level PID holds the combined POI output at the active curtailment set point recovering energy value from constrained generation events.

Increased asset utilization and improved round-trip energy yield.

NA: Enhanced energy capture during grid curtailment events and structural DC clipping conditions.

EU: Improved capacity factor and energy shifting value in constrained grid environments.

Grid code compliance

Certified for the grids you connect to

Interconnection approvals depend on proving compliance. PowerTrack PPC carries the certifications utilities and TSOs ask for, so your project moves to operation with fewer delays.

North America & EMEA

  • VDE-certified (VDE-AR-N 4110, 4120 and 4130) for medium-voltage, high-voltage and power plant controller requirements
  • NC RfG (EU 2016/631) compliant
  • Polish National Grid Code compliant
  • NERC CIP support

Cybersecurity

  • SOC 2 Type II audited against NIST 800-53
  • NIS2-compliant
  • ISO 9001 certified

Our engineers support utility and ISO witness testing.

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Proven in the field

Real projects. Real results.

Customer: Neovolt

Site type: Standalone Solar

Capacity: 484 MW

Grid operator / region: Hungary

The Stem Difference: Requiring a platform with an established track record in Eastern Europe and the flexibility to meet local market requirements, Neovolt sought out Stem for end-to-end support from design and commissioning through ongoing operations under a five-year agreement.

Customer: Avangrid Portfolio

Site type: Standalone Solar

Capacity: 350 MW

Grid operator / region: Oregon, California, and Washington

The Stem Difference: PowerTrack PPC ensures compliance with CAISO requirements and the IEEE 2800 standard for inverter-based resources.

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Every PowerTrack PPC control mode, with North American and EMEA nomenclature, plus full hardware specifications, in one download.

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Deployment options

Three paths to PowerTrack PPC

Whether you are breaking ground, replacing legacy controls, or adding storage to an operating solar site, there is a path that fits your project.

Path 1

New build

Designed from day one

Design PowerTrack EMS and PPC into new energy storage or hybrid projects for coordinated control with no integration gaps.

Path 2

Replace legacy controls

One system instead of several

Replace separate third-party control systems with PowerTrack EMS and PPC to remove the coordination complexity and latency between them.

Path 3

Add storage later

Solar today, hybrid tomorrow

When you add energy storage to your site, the same PowerTrack PPC extends to hybrid control with minimal to no hardware changes.

Already have a third-party PPC? PowerTrack EMS works with it too. See how on the PowerTrack EMS page

Delivery

Engineering support from design to interconnection

Getting a PPC through interconnection takes more than software. Stem’s in-house engineering team manages the work from end-to-end, with quality gates and documentation at every milestone.

Design and engineering

30/60/90/IFC drawing packages, control narratives, network design, and customer approval at every stage.

Configuration

PPC and EMS control mode configuration and multi-vendor drivers, built in parallel with the hardware.

Factory build and testing

FAT of hardware and software together, and systems ship preconfigured.

Commissioning

PPC/EMS open- and closed-loop testing, utility and ISO witness test support, and SAT.

One point of contact

A dedicated Stem project manager coordinates every team involved, from design through commissioning, so you always know where your project stands.

Explore Project Delivery Services

Take a deeper dive

Flier

PowerTrack EMS & PPC for Hybrid Projects

How unified EMS and PPC control runs solar and storage as one asset, plus hybridization pathways and advanced hybrid functions.

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Technical overview

PowerTrack EMS Technical Overview

Solution architecture, the full PPC control modes list, and hardware specifications.

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Want to Learn More?

Download this datasheet for a closer look at PowerTrack PPC's features, specs, and how it can help you get more from your assets.

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Ready to Get Started?

Request a demo to see PowerTrack PPC in action and discover how it can bring advanced supervision and control to your entire portfolio.

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