TECHNICAL DESCRIPTION
SC-Power Plant
Suzlon Energy A/S
Kystvejen 29
DK-8000 Aarhus
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TECHNICAL DESCRIPTION – SC-POWER PLANT
Table of Contents
1
Scope ............................................................................................................ 3
1.1
1.2
1.3
2
Introduction.................................................................................................. 4
2.1
3
Infrastructure .................................................................................................... 6
Active power regulation....................................................................................... 7
Reactive power regulation ................................................................................... 7
Power plant regulation schemes and interfaces ............................................ 8
4.1
4.2
4.3
4.4
5
Optional power plant equipment........................................................................... 5
SC-Power Plant architecture ......................................................................... 6
3.1
3.1.1
3.1.2
4
Main subject of this document.............................................................................. 3
Field of application.............................................................................................. 3
Terminology ...................................................................................................... 3
Active power regulation....................................................................................... 8
Power factor regulation ....................................................................................... 8
Power plant start and stop................................................................................... 8
SC-Power Plant interfaces.................................................................................... 8
SC-Power Plant hardware ............................................................................. 9
Appendix A ....................................................................................................... 10
Disclaimer................................................................................................................... 12
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TECHNICAL DESCRIPTION – SC-POWER PLANT
1 Scope
1.1
Main subject of this document
This document describes the product SC-Power Plant, which is part of Suzlon SCADA portfolio.
1.2
Field of application
Suzlon wind power plants which are designed according to the SC-Plant Network requirements.
1.3
Terminology
SC-Turbine
Suzlon Control Turbine (Wind turbine controller)
1
SC-MetStation
Suzlon Control Meteorological controller
SC-Commander
Suzlon Control Commander (SCADA client)
SC-SCADA Reporting
Suzlon Control SCADA Reporting Package (Web server)
SC-Power Plant
2
SC-Plant Network
Suzlon Control Power Plant controller
Suzlon Control Plant Network
1
Please note that SC-MetStation will be available for ordering by end of 3.Q 2007.
2
Please note that SC-Power Plant will be available for ordering by end of 3.Q 2007.
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TECHNICAL DESCRIPTION – SC-POWER PLANT
2 Introduction
All standard Suzlon SCADA solutions for wind power plants consist of minimum four different
elements. The standard components are:
•
SC-Turbine is the turbine controller based on a Bachmann M1. The SC-Turbine monitors
and controls everything inside the turbine and process/stores all relevant historical data.
SC-Turbine is self-governing and need no external input to keep the turbine running.
•
SC-Commander is the control and monitoring user interface. SC-Commander provides
direct access to the SC-Turbines, SC-MetStations and SC-Power Plant for detailed analysis
and operation purposes. SC-Commander is used by the service crews on site and by hotline
service centers for remote troubleshooting. SC-Commander is connected to the SCTurbines, SC-MetStation and SC-Power Plant via the LAN inside the power plant or
remotely via a secure VPN connection.
•
SC-SCADA Reporting Server is a central Suzlon database where wind power plant data is
hosted for reporting. The SC-SCADA Reporting server is located in a central location and is
operated and maintained by Suzlon. The SC-SCADA Reporting server retrieves the
statistical data from the SC-Turbine, SC-MetStation and SC-Power Plant from all connected
wind power plants. The user interface is web-based. The SC-SCADA Reporting is used for
customer asset management and Suzlon warranty monitoring. The SC-SCADA Reporting
database is connected to the SC-Turbines, SC-MetStation and SC-Power Plant via LAN to
LAN using secure VPN connections.
•
SC-Plant Network is the power plant communication infrastructure and its connections to
the outside world. The SC-Plant Network is the required infrastructure between the
relevant power plant components and SC-SCADA Reporting. The communications is based
on a 100Mbit TCP/IP networks and broadband Internet connections with a VPN
infrastructure.
x 56
SC-Turbine
x1
SC-MetStation
x1
SC-Power Plant
VPN via Internet
SC-SCADA Reporting
Database
x 10
SC-Turbine
x4
SC-SCADA Reporting
WEB Interface
SC-Turbine
x 26
SC-Commander
SC-Commander
SC-Turbine
SC
Figure 1 - Suzlon wind power plant SCADA system principle layout
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TECHNICAL DESCRIPTION – SC-POWER PLANT
2.1 Optional power plant equipment
Following options can be added to the wind power plant designed as required. The products are
optional and not required for all wind power plants.
•
SC-Power Plant is designed to control all the turbines as one complete wind power plant.
The controller is capable of controlling the wind power plant output according to external
set points provided by SC-Commander, hardwired I/O or a MODBUS TCP interface. The SCPower Plant is connected to the SC-Plant Network in the same way as the SC-Turbines and
SC-MetStation. The SC-Power Plant is a Suzlon designed product based on a Bachmann M1
controller similar to the one used in SC-Turbines and SC-MetStation.
Please note that the SC-Power Plant shall be installed at the substation and requires CT’s
and PT’s inputs from the point of interconnection to achieve the optimal regulation.
•
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SC-MetStation is the standard Suzlon meteorology station installed in the wind power
plants. The meteorology station is power from the nearby turbine and connected to the SCPlant Network in the same way as the SC-Turbines and SC-Power Plants. The SCMetStation is a Suzlon designed product based on a Bachmann M1 controller similar to the
one used in SC-Turbines and SC-Power Plants.
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TECHNICAL DESCRIPTION – SC-POWER PLANT
3 SC-Power Plant architecture
The following section explains how the SC-Power Plant is incorporated in to the SC-Plant Network
and how the SC-Turbines are regulated as part of the of complete wind power plant.
3.1 Infrastructure
Figure 2 is a typical example of a wind power plant with 10 turbines, a meteorology station and a
substation. The plant consists of two medium voltage feeders collecting the energy from the
turbines and bringing it to the substation where it is provided to the grid at a higher voltage level.
All revenue metering is done at the substation and is a subject between the plant owner and the
power purchaser. The equipment used for the revenue metering are typically installed and
monitored by the grid operator.
MET 1
WTG 4
WTG 3
WTG 5
WTG 2
WTG 1
ADSL line
Substation
WTG 6
WTG 7
WTG 8
WTG 9
WTG 10
Figure 2 - Typical wind power plant layout
G
G
G
G
G
SC-Turbine 3
SC-Turbine 4
SC-Turbine 5
SC-Turbine 2
SC-Turbine 1
G
Substation
G
G
G
G
SC-Turbine 6
MV cables (collecting system)
SC-Turbine 7
SC-Turbine 10
SC-Turbine 9
G
SC-Turbine 8
Generator
Capacitor banks
Transformer
Figure 3 – Wind Power collecting system
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TECHNICAL DESCRIPTION – SC-POWER PLANT
Figure 3 shows a single-line diagram of the wind power plant infrastructure – collecting system. In
most cases the power plant owner needs to comply with specific interconnect grid requirements.
This often means that all the turbines need to be controlled as one power plant based on grid
measurements as the substation.
Figure 4 shows the regulation and communication infrastructure in the wind power plant. In every
turbine the SC-Turbine (Bachmann controller) measures the grid parameters for secure local
turbine operations and control. This grid information is also made available for the SC-Power Plant
controller installed at the substation.
The SC-Power Plant is retrieving the online data from all the turbines and uses this together with
the grid information from the substation to regulate the complete wind power plant. The SC-Power
Plant if furthermore an online data concentrator used by the Suzlon OPC server.
G
G
SC-MetStation 1
G
G
G
SC-Turbine 4
SC-Turbine 3
SC-Turbine 5
SC-Turbine 2
SC-Turbine 1
G
G
SC-Power Plant
G
G
G
SC-Turbine 6
SC-Turbine 10
SC-Turbine 9
Fibre optical communication cables
Grid measuring signal cables
SC-Turbine 7
Bachmann M1 controller
SC-Turbine 8
External communication interface
Figure 4 - Power Plant regulation network
3.1.1 Active power regulation
The active power (kW) produced by the turbines are controlled by a parameter in the SC-Turbine
controller. This parameter can be remotely changed by the SC-Power Plant when necessary. The
SC-Turbine controls the active power by changed the pitch angle of all three blades. In some cases
it might be necessary to reduce the active power beyond the minimum control level of the turbine.
In such situation one or more turbines in the plant will be stopped and through that achieve a
wider regulation range of the wind power plant.
3.1.2 Reactive power regulation
The reactive power (kVar) consumed and produced by the turbines are control via a power factor
set point. When no power factor regulation is active the turbines are as standard configured to aim
at a unity power factor measured at the turbine on the low voltage side of the transformer.
Please note that that the accuracy of the power factor regulation will decrease considerably when
the turbine active power product is below 20%.
The turbine power factor correction system is as standard based on switched capacitors with a
discharged time of 5 minutes and a regulation range of 0.95 inductive to Unity. In some turbines a
converter will be part of the reactive power compensation equipment providing a wider power
factor range. In such setups each SC-Turbine will control the arrangement of capacitor banks and
the converter. For the SC-Power Plant controller the regulation will be the same meaning that the
power factor will be controlled by a single set point per turbine.
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TECHNICAL DESCRIPTION – SC-POWER PLANT
4 Power plant regulation schemes and interfaces
The following section describes the SC-Power Plant in regards to interfaces and regulation features.
To achieve the optimal plant regulation the Power Plant controller need grid data from the
interconnect point. This information can be acquired with the ION grid meter built into SC-Power
Plant panel.
Please note that this installation require 3xCT’s and 3xPT’s signals from the substation.
In case of small wind power plant with no CT’s and PT’s available for the regulation, the collected
SC-Turbine kW and kvar production numbers can be used as reference.
Please note that this type of reference for the regulation is not recommended.
4.1 Active power regulation
The SC-Power Plant controller regulates the active power (kW) for the wind power plant according
to different inputs. More than one active power set point may apply at the same time. When
different active power set points are active for the wind power plant the SC-Power plant will
regulate the power down according to the lowest parameter input.
Each active power set point can be configured with a predefined kW/min ramp rate.
All regulation inputs are logged with source by the SC-Power plant controller, which makes it
possible to trace who is responsible for reducing the power output now and in the past.
Please note that the controller can only regulate the active power to the extend that:
The communications to the turbines are available.
-
4.2 Power factor regulation
The SC-Power Plant controller regulates the power factor at the interconnection point according to
a received set point; the SC-Power Plant controller then regulates the power factor (PF) in each
turbine to achieve the external set point at the substation. Only one external regulation input can
be active at any given time.
All regulation inputs are logged with source by the SC-Power plant controller, which makes it
possible to trace who is responsible for controlling the power factor now and in the past.
Please note that the controller can only regulate the power factor to the extend that:
-
The communications to the turbines are available.
-
The reactive power is available in the turbines.
4.3 Power plant start and stop
The power plant can be started and stopped via the SC-Power Plant controller. The starting and
stopping can furthermore be controlled according to a predefined kW/min ramp rate.
4.4 SC-Power Plant interfaces
The SC-Power plant controller can monitor, control and receive information for a number of
communication interfaces. The use of the different interfaces varies from plant to plant and
depends on the project specific design of the wind power plant.
Following interfaces are part of the SC-Power Plant:
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MODBUS TCP slave – used for utility monitoring and plant set points.
-
MODBUS TCP master – used for Suzlon ION grid meter integration.
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TECHNICAL DESCRIPTION – SC-POWER PLANT
-
Suzlon OPC server – used for Enterprise monitoring and plant set points.
-
SC-Turbines interface – used for SC-Power Plant to control and monitor the turbines
-
SC-MetStation Interface - used for SC-Power Plant to monitor the meteorology stations
-
SC-Power Plant controller I/O - used for utility monitoring and plant set points.
-
SC-Commander – used for manual control by the plant operators.
For more information regarding the available data points used for utility and Enterprise monitoring
please refer to appendix A.
5 SC-Power Plant hardware
The SC-Power Plant controller is a build into a wall mounting cabinet. The panels include different
components some of these are:
-
Bachmann M1 controller with power supply
o
-
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5 digital inputs
-
3 Analogue inputs
-
8 Analogue outputs
-
3 Serial interfaces (RS232 half duplex, RS485…)
An ION power meter
o
-
The hardwired scope covers:
Terminals for the CT’s and PT’s used by the power meter
Fibre optical switch – N-TRON
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TECHNICAL DESCRIPTION – SC-POWER PLANT
Appendix A
The following table describes the available SC-Power Plant data tags accessible via OPC and MODBUS TCP
for utility and Enterprise systems monitoring and control.
In case of the Modbus interface, registers are 16 bit values with scaling applied. There is a maximum
limit of 1.000 values on two Modbus addresses each for exposing Modbus data. SC-Power Plant and SCMet Station data are addressed on one Modbus address where the SC-Turbine data is using the full 1.000
values on the other Modbus address (100 turbines x 10 values).
SC-Power Plant data tags
Units
Description
Access
ActivePowerInput
kW
ReadOnly
ActivePowerInputWTG
kW
Measured active power at connection point via Suzlon Power meter or via
Modbus Input
Sum of the active power from individual turbines
ReadOnly
ActivePowerSetpoint
kW
The active power setpoint from regulation sources (min. value of source 1-5)
ReadOnly
ActivePowerSetpointSource
integer
Number of the active power setpoint source (1-5)
ReadOnly
ActivePowerCapableOutput
kW
Power output capability
ReadOnly
ReadOnly
ActivePowerRampRate
kW/min
Ramp rate for the Active power regulation
ActivePowerSetpointWired
kW
Source 1 - Hardwired input signal for active power setpoint
ReadOnly
ActivePowerSetpointSCCmd
kW
Source 2 - The active setpoint for active power via SC-Commander
ReadOnly
ActivePowerSetpointRemoteA
kW
Source 3 - Active power setpoint via remote signal (OPC tag or Modbus)
Read/Write
ActivePowerSetpointRemoteB
kW
Source 4 - Active power setpoint via remote signal (OPC tag or Modbus)
Read/Write
ActivePowerSetpointRemoteC kW
Source 5 - Active power setpoint via remote signal (OPC tag or Modbus)
Read/Write
ReactivePowerInput
kVAr
Measured reactive power at connection point via Suzlon Power meter
ReadOnly
ReactivePowerInputWTG
kVAr
Sum of the reactive power from individual turbines
ReadOnly
ReactiveRegulationMode
#
Which reactive regulation mode the plant is operating in
ReadOnly
PowerFactorInput
CosPhi
ReadOnly
PowerFactorInputWTG
CosPhi
Measured Power factor at connection point via Suzlon Power meter or
Modbus Input
Measured Power factor by turbine data
PowerFactorSetpoint
CosPhi
PowerFactorSetpointSource
#
The active setpoint for Power factor - defined as a negative for Inductive and
positive for capacitive.
Number of the Power factor setpoint source (1-5)
PowerFactorSetpointWired
CosPhi
Source 1 - Hardwired input signal for power factor setpoint
ReadOnly
PowerFactorSetpointSCCmd
CosPhi
Source 2 - The power factor setpoint via SC-Commander
ReadOnly
PowerFactorSetpointRemoteA CosPhi
Source 3 - Remote setpoint for power factor (OPC tag or Modbus)
Read/Write
PowerFactorSetpointRemoteB CosPhi
Source 4 - Remote setpoint for power factor (OPC tag or Modbus)
Read/Write
PowerFactorSetpointRemoteC CosPhi
Source 5 - Remote setpoint for power factor (OPC tag or Modbus)
Read/Write
CurrentL1
A
Current on phase 1
ReadOnly
CurrentL2
A
Current on phase 2
ReadOnly
CurrentL3
A
Current on phase 3
ReadOnly
VoltageL1
V
Voltage on phase 1
ReadOnly
VoltageL2
V
Voltage on phase 2
ReadOnly
VoltageL3
V
Voltage on phase 3
ReadOnly
Frequency
Hz
Frequency
ReadOnly
TurbinesAvailable
#
ReadOnly
TurbinesOnGrid
#
TurbinesCommunicationOk
#
Number of turbines without any Brake Program (TS 21-25) and
communication ok
Number of turbines connected to the Grid and producing power (TS 10+11)
and communication ok
Number of turbines with successfull communication
TurbinesTotal
#
Total number of turbines configured on the SC-PowerPlant
ReadOnly
DigitalInput1
bit
Digital input signal 1
ReadOnly
DigitalInput2
bit
Digital input signal 2
ReadOnly
DigitalInput3
bit
Digital input signal 3
ReadOnly
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ReadOnly
Read/Write
ReadOnly
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TECHNICAL DESCRIPTION – SC-POWER PLANT
DigitalInput4
bit
Digital input signal 4
ReadOnly
DigitalInput5
bit
Digital input signal 5
ReadOnly
UptimeCounter
integer
Uptime counter - used as a watch-dog signal - increasing every second
ReadOnly
The following data tags are repeated for every SC-MetStation unit configured on the SC-Power Plant
controller (up to 4 SC-MetStations);
SC-MetStation data tags
Units
Description
Met1WindSpeed
m/s
Wind speed (max of anemometer 1-4)
Access
ReadOnly
Met1WindIntensity
Beaufort
Wind intensity according to Beaufort Scale (0 ... 12)
ReadOnly
Met1WindDirection
Deg
Wind direction
ReadOnly
Met1AmbientTemp
deg C
Ambient temperature (max of thermometer 1-2)
ReadOnly
Met1AirPressure
mbar
Air pressure
ReadOnly
Met1AirDensity
kg/m3
Processed value of air density using Ambient temp and pressure
ReadOnly
Met1Humidity
%
Relative humidity
ReadOnly
Met1RainDetection
bit
Rain detected (Yes/No)
ReadOnly
Met1SCMetStationState
integer
Reference number for the SC-MetStation state (Running etc.)
ReadOnly
Met1SCMetStationInService
integer
Indication of the MetStation is in Service mode
ReadOnly
The following data structure is repeated for 100 turbines. In case of a Modbus connection, this data is
available on a separate Modbus address from the other data sets.
SC-Turbine data tags
Units
Description
Access
Turbine1ActivePower
kW
Active power (kW)
ReadOnly
Turbine1GenRPM
RPM
Generator speed (RPM) using Bachmann counter module
ReadOnly
Turbine1NacellePos
deg
Nacelle position relative to north position (0° - 360°)
ReadOnly
Turbine1PitchAngle1
deg
Pitch angle on blade 1 (°)
ReadOnly
Turbine1PowerFactor
CosPhi
Power Factor (CosPhi)
ReadOnly
Turbine1WindDirection
deg
Wind direction relative to nacelle position. When nacelle is pointing up
wind, this value is close to ‘0’.
Wind speed (m/s) - maximum value of anemometer 1 and 2 readings.
ReadOnly
Expected average power using 10 min average wind speed looked up into
the turbine processed 30 sec power curve (1 m/s steps)
The single active alarm code that caused the turbine to stop (root cause) –
see turbine alarm list for details on individual alarm codes.
Bitmask for the following data;
ReadOnly
ReadOnly
Turbine1WindSpeed
m/s
Turbine1PowerOutPWC
kW
Turbine1EventCode
integer
Bit-mask for:
integer
ReadOnly
ReadOnly
ReadOnly
Turbine1TurbineState
Byte
Turbine1Derated
bit
Reference number for the turbine state (Idle mode, sync-mode, G1-prod.
etc.)
See Appendix 1 – Turbine state (TS) for the reference look-up list.
Indicates if the turbine is being curtailed / derated
Turbine1TurbineInService
bit
Indication of the turbine is in Service mode (crew in turbine)
ReadOnly
Turbine1CommOk
bit
PPC.PCM..FM_B_Set[200] (Index 200..299 = turbine #1..100)
ReadOnly
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TECHNICAL DESCRIPTION – SC-POWER PLANT
The following data is polled by the SC-Power Plant controller from an ION Power meter via Modbus TCP
using 32 bit registers. In this case, the SC-Power Plant is Modbus master unit and the ION meter is slave.
Power meter input tags
Units
Description
Access
AuxActivePowerInput
kW
Measured active power at connection point via external source
Read/Write
AuxReactivePowerInput
kVAr
Measured reactive power at connection point via external source
Read/Write
AuxCurrentL1
A
Current on phase 1 via external source
Read/Write
AuxCurrentL2
A
Current on phase 2 via external source
Read/Write
AuxCurrentL3
A
Current on phase 3 via external source
Read/Write
AuxVoltageL1
V
Voltage on phase 1 via external source
Read/Write
AuxVoltageL2
V
Voltage on phase 2 via external source
Read/Write
AuxVoltageL3
V
Voltage on phase 3 via external source
Read/Write
AuxFrequency
Hz
Frequency via external source
Read/Write
Disclaimer
The MODBUS and OPC update rates will have an affect on the LAN and WAN communication load.
Suzlon reserves the right to change the update rates or if necessary disconnect the OPC Servers at
any time during the warranty period, as access to the turbines and critical operations such as
regulation and data collection will have the highest priority.
Recommended update rates of MODBUS and OPC tags from controller units will be provided by
Suzlon for individual projects.
The MODBUS and OPC namespace for any controller unit can be changed by Suzlon at any time as
required.
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