skycontrol 
Power Plant 
Controller

Our integrated system for PV power plant control and grid stability management, skycontrol, is a state-of-the-art solution to meet grid operators’ requirements for utility-scale PV installations. It ensures controlled grid injection, both at medium and high voltage levels, and is adjustable to comply with different regional, national and international grid codes. An optional TeleControl Gateway allows the skycontrol system to implement the industry-standard transmission protocols IEC 60870, IEC 61850 and DNP3. The controller uses closed-loop control principles, based on high-precision metrics from the grid connection point, with continuous feedback to the controller input.

Combined our adaptable control algorithms and communication sequences, skycontrol is an outstanding tool for fast and stable power plant control, even in large-scale and distributed PV installations comprising several independent PV blocks.

Key Features

  • Closed-loop control of active and reactive power
  • Reactive power injection, reactive power compensation of passive components, voltage and frequency stabilisation
  • Fast and precise settlement of control functions
  • Highly adaptable to grid operators’ requirements
  • Seamless integration with skytron® energy's monitoring system


    • Feedback of actual values from grid connection point at medium or high voltage level
    • Compatible with virtually all inverters on the market (see document „Compatible Inverters“ on www.skytron-energy.com)
    • Suitable for mixed PV installations, equipped with different makes of inverters
    • Optional available: a power plant controller and a data logger in one device
    • Interfaces (digital I/O, 4-20 mA, 0-10 V, MODBUS, IEC 60870-5-101/-104, IEC 61850, DNP3)
    • Full integration pf plant controller values, alarms and notifications within skytron® energy’s supervision platform PVGuard®, including specific plant controller view options
    • Power System Modelling (PSS/E; PowerFactory; MatLab/Simulink)

    Uniqueness

    Experience

    • 4 GWp are governed by our skycontrol plant controller, worldwide
    • More than 430 running plant controllers, from 400 kWp up to 86 MWp
    • Medium and high voltage grid connection
    • Our team of qualified engineers will support all project phases from design, though acceptance of the power plant by the local grid operator, up to operation.

    Versatility

    • Controls multiple technologies – solar, statcom, capacitor and inductor banks, wind, storage,and multitude of inverter makes, even in parallel
    • Highly adaptable to customer needs
    • Remote setting by grid operator and energy trader

    Innovation

    • Ramp rate control without storage (rising edge)
    • Frequency support by providing balancing power
    • Complex consumption solutions available
    • Cascadable heterogeneous sub-plants

    Advantages

    • Power plant acts as a single generator towards the grid
    • Independency from inverter type or vendor and even plant layout
    • Infinite degrees of freedom for utility specs and interfaces

    Power control works dynamically and is capable to balance:

    • the outage of inverters
    • intermittent cloud cover (rising edge ramp rate control)
    • losses through passive power components

    System Overview

    Level 01

    Reliable field busses between data logger and inverter.

    Level 02

    Fibre Optic Ring (Ethernet based, redundant, wide area connection) between data logger and plant controller

    Level 03

    Dedicated secure connection to grid operator and/or energy trader, and Internet to monitoring provider, data base, and supervision platform

    Grid Integration solutions
    Supported Grid Codes

    • Prepared grid code
    • Realized skycontrol projects
    India
    STU
    Australia
    Transgrid, Powerlink, AEMO
    South Africa
    ESKOM
    United States of America
    Duke Energy, Dominion Power, AEP
    Ukraine
    Odessa
    Japan
    HEPCO
    Italy
    ENEL
    United Kingdom
    WPD, SSE, UKPN, SPEN
    France
    RTE & ERDF
    Portugal
    EDP
    Jordan
    JEPCO, NEPCO
    Egypt
    EETC
    Germany
    +100 GSO
    Romania
    Transelectrica
    Czech Republic
    EON Czech
    Mauritius
    CEB
    Chile
    CDEG-SING
    Samoa

    Software Features
    skycontrol

    Active Power Control

    Absolute
    Limits

    • Apparent power limit
      (may reduce P on high Q)
    • Active power limit
    • Static setpoints
    • External setpoints
    • Zero feed-in solution
    • Overshoot protection

    Setpoint
    Handling

    • Scaling to reference values
    • Gearbox (linear modification)
    • Asymmetric setpoint ramping
    • Responsive ramping

    Balancing Power Reserve

    • Dynamically reduced power injection to maintain power reserve for frequency stabilization
    • Configurable power offset

    Reactive Power Control, Grid Stability Support

    Characteristic Curves

    • P(f)
    • ΔP(f)
    • Q(P)
    • Q(U)
    • cosphi(P)
    • cosphi(U)
    • Activation from extern
    • Dynamic curves

    Grid Stability Support

    Frequency stabilization

    • Increase or decrease of active power on grid frequency
    • Grid disconnect and reconnect

    Reactive Power Controller

    • cosphi  + Q control
    • Dynamic limitation
    • Disturbance feedforward
    • Oscillation detection
    • Voltage control

    Reactive Power
    Compensation Devices

    • Passive compensation
    • Active compensation devices
    • Balancing between compensation devices and inverters
    • Switch modes on ambient conditions

    Common Controller Structure

    • Closed loop PID
    • Controller Bypass
    • Feedforward control 
    • Anti-Windup control (P only)
    • Model based control
    • Fault mode fallback and bypass

    Nightly
    Grid Support

    • Reactive power at night
    • Night mode activation on configurable input states

    Interfacing and System Automation

    Protocols

    • Energy trading (modbus)
    • RICC (remote HMI)
    • RtSO (Real-time Scada Operations)
    • IEC60870-5-101/104
    • IEC61850
    • DNP3
    • Modbus

    Controller
    Data Source

    Selectable measurement sources; out of:

    • Net analyzers
    • Analog input
    • IEC60870 / DNP3
    • Static value aggregation

    IO

    • Up to 16 digital IO
    • Up to 4 analog IO
    • Mirroring signals
    • Up to 3 net analyzers
    • Complex IO interface (PLC)

    Data
    Handling

    • Seamless integration to PVGuard®
    • FTP push
    • Local buffer proxy
    • Plant feedback
    • Potential power estimation

    System
    Automation

    • Grid disconnect and
      reconnect on defined
      conditions
    • Medium voltage ring protection
    • Ramp activation
    • Remote Configuration Automation

    Hierarchical
    Control

    • Heterogeneous subplants
    • Distributed setpoint control
    • Distributed control value control

    Special Features / Service

    Room for your innovation

    • We provide support and can develop new features on request for your special PV site demands

    Service

    • Role based user management
    • Test configurations
    • Override measured values
    • Export highres logfiles
    • NTP

    Hardware Features
    skycontrol

    skycontrol CP

    THE COMPACT skycontrol CP

    Combines skycontrol and skylog.

    Provides mandatory grid integration interfaces.

    Directly connects inverters.

    INDUSTRIAL PC

    High-performance industrial PC with robust aluminium housing. The wide temperature range makes the system suitable for any installation site.

    ETHERNET SWITCH

    Industrial grade fibre optic multimode switch. Optional available: single-mode or copper only switches.

    24 V DC UNINTERRUPTABLE POWER SUPPLY (UPS)

    195 to 265 V AC, 47 to 63 Hz (optional 85 to 264 V AC, 44 to 66 Hz) mains, overvoltage protected

    REMOTE ACCESS FUSES

    Remote switchable 24 V DC fuses

    SURGE PROTECTION DEVICES

    For CAN bus signals and RS-485

    TERMINALS

    Separated clamp area for easy handling on installation and service.

    CABINET

    IP 66 electric cabinet, powder-coated steel

    Data Sheet

    Technical specifications for skycontrol CP as PDF

    Download

    skycontrol

    THE STANDARD skycontrol

    Basis platform for all skycontrol.

    Provides flexible interfaces.

    Works seamlessly with all other skytron® products.

    INDUSTRIAL PC

    High-performance industrial PC with robust aluminium housing. The wide temperature range makes the system suitable for any installation site.

    ETHERNET SWITCH

    Industrial grade fibre optic multimode switch. Optional available: single-mode or copper only switches.

    24 V DC UNINTERRUPTABLE POWER SUPPLY (UPS)

    195 to 265 V AC, 47 to 63 Hz (optional 85 to 264 V AC, 44 to 66 Hz) mains, overvoltage protected

    REMOTE ACCESS FUSES

    Remote switchable 24 V DC fuses

    SURGE PROTECTION DEVICES

    For CAN bus signals and RS-485

    TERMINALS

    Separated clamp area for easy handling on installation and service.

    CABINET

    IP 66 electric cabinet, powder-coated steel

    Data Sheet

    Technical specifications for skycontrol as PDF

    Download

    skycontrol Pro

    ALL YOU CAN GET VARIANT

    Provides generous space for all known interface configurations.

    Can be designed for your custom needs.

    INDUSTRIAL PC

    High-performance industrial PC with robust aluminium housing. The wide temperature range makes the system suitable for any installation site.

    ETHERNET SWITCH

    Industrial grade fibre optic multimode switch. Optional available: single-mode or copper only switches.

    24 V DC UNINTERRUPTABLE POWER SUPPLY (UPS)

    195 to 265 V AC, 47 to 63 Hz (optional 85 to 264 V AC, 44 to 66 Hz) mains, overvoltage protected

    REMOTE ACCESS FUSES

    Remote switchable 24 V DC fuses

    SURGE PROTECTION DEVICES

    For CAN bus signals and RS-485

    TERMINALS

    Separated clamp area for easy handling on installation and service.

    CABINET

    IP 66 electric cabinet, powder-coated steel

    BATTERIES

    Two batteries AGM 12 V, 40 h


    Data Sheet

    Technical specifications for skycontrol RI as PDF

    Download

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