Monitoring at the Zuera II solar park in Spain guarantees long-term yields

Overview

Solar panels in the Zuera II solar park  

Solar park with 54,000 crystalline modules

  • Grupo Jorge operates a solar park covering an area of more than 30 hectares near the Spanish city of Zaragoza.
  • The continuous monitoring of the strings ensures the stable and efficient operation of the entire system.
  • A string combiner box has been developed, which houses the string monitoring modules as well as the necessary surge protection components.
  • Grupo Jorge's long-term energy yields are secured, thanks to the complete regulation and visualization of recorded values.

Customer profile

Grupo Jorge employees at the Zuera solar park  

Grupo Jorge operates the solar park near Zaragoza (image source: Grupo Jorge)

Grupo Jorge has been active in the meat processing industry for 75 years and is committed to adopting a sustainable approach to the available resources.

The Zuera II solar park it operates, which was connected to the grid in October 2012 with 11.5 megawatts, covers an area of more than 30 hectares and generates solar power for more than 10,000 residents.

Application

String combiner boxes and string monitoring modules  

String combiner boxes and string monitoring modules with surge protection

The Zuera II solar park consists of 54,000 crystalline modules, which track the path of the sun along a single horizontal axis.

The solar park topology is divided into nine segments. Each segment is made up of 256 strings, which are connected to two central inverters via 16 string combiner boxes (SCBs). Between the SCB and the inverter station, DC meters measure the current and voltage of the DC lines. On the AC side, the converted current and voltage are determined before being fed into the power grid.

An important requirement for operators is the continuous monitoring of the strings, which ensures the stable and efficient operation of the entire system.

Solution

Topological representation of the solar park  

Topological representation of the solar park

With this in mind, Phoenix Contact has developed a string combiner box for 16 strings, which houses the string monitoring modules from the SOLARCHECK product range as well as the necessary surge protection components.

The solar cables are connected to each SCB via external SUNCLIX plug-in connections. Potential collective terminal blocks enable the fast and space-saving interconnection of the individual strings. The SOLARCHECK measuring modules monitor the string currents and voltages. Surge protection components for DC and data cables round off the SCB solution.

An Inline small-scale controller collects the string data from the SOLARCHECK communication modules on the devices in the park. Tracking units, SOLARCHECK communication modules, DC meters, inverters, and AC meters are addressed in this way. The controller also records the temperature of the PV panels as well as the radiation values recorded via analog input terminals, and then further processes the data.

Two meteorological stations record relevant weather data, which is forwarded to a controller. This sends the data directly to the SCADA system and to the higher-level park controller via the PROFINET protocol.

Topological representation of the solar park with the AXweb+ web-based management system  

AXweb+ web-based management system

Display the recorded values at any time

Operators use the web-based AXweb+ management system from Phoenix Contact, which displays performance and weather data for the solar park, for visualization and system monitoring. Operators can call the latest data via a website on which park performance is visualized either locally or via the Internet in order to gain an overview of relevant information at any time.

An error report documents failures and visualizes problems with the communication between the individual devices in the park. Maintenance personnel can access detailed information at any time at the click of a mouse.In the event of an error, the cause can be localized quickly and measures can be introduced immediately. Service employees are also notified of faults by SMS.

Summary

The complete regulation of the Zuera II solar park on the basis of string monitoring and the visualization of the recorded values secures Grupo Jorge's long-term energy yields. The group of companies chose Phoenix Contact on account of the high quality of the overall solution as well as the comprehensive support for components and systems. The automation specialist's team provided support throughout the startup phase. As all questions from the companies involved in the construction project were answered swiftly, the solar park could be connected to the grid in no time at all.

Products

DescriptionTypeOrder No.
String combiner box for 32 strings with Inline fuseSOL-SC1-32-0-FI-VMC-T1-SD1-222403683
String combiner box for 16 strings with standard string fuseSOL-SC1-16-0-F-VM-T1-SD1-112403682
Photovoltaic connectorPV-CF-S 6-16 (+)1790784
Photovoltaic connectorPV-CM-S 6-16 (-)1790797
Feed-through terminal block with spring-cage connectionSTU 35/ 4X103033126
SCK measuring module for monitoring photovoltaic systemsSCK-M-I-8S-20A2903241
SCK communication module for data acquisition of up to 8 x SCK measuring modulesSCK-C-MODBUS2901674
Inline controllerILC 171 ETH 2TX2700975
Inline controller with PROFINET interfaceILC 350 PN2876928
Ethernet Lean Managed SwitchFL SWITCH LM 4TX/2FX2832658
Primary-switched TRIO POWER power supply for DIN rail mountingTRIO-PS/1AC/24DC/102866323
Inline digital input terminal, complete with accessoriesIB IL 24 DI 16-PAC2861250
Inline RS-485/422 function terminal for serial data transmissionIB IL RS 485/422-PRO-PAC2863627
DescriptionTypeOrder No.
String combiner box for 32 strings with Inline fuseSOL-SC1-32-0-FI-VMC-T1-SD1-22
String combiner box for 16 strings with standard string fuseSOL-SC1-16-0-F-VM-T1-SD1-11
Photovoltaic connectorPV-CF-S 6-16 (+)
Photovoltaic connectorPV-CM-S 6-16 (-)
Feed-through terminal block with spring-cage connectionSTU 35/ 4X10
SCK measuring module for monitoring photovoltaic systemsSCK-M-I-8S-20A
SCK communication module for data acquisition of up to 8 x SCK measuring modulesSCK-C-MODBUS
Inline controllerILC 171 ETH 2TX
Inline controller with PROFINET interfaceILC 350 PN
Ethernet Lean Managed SwitchFL SWITCH LM 4TX/2FX
Primary-switched TRIO POWER power supply for DIN rail mountingTRIO-PS/1AC/24DC/10
Inline digital input terminal, complete with accessoriesIB IL 24 DI 16-PAC
Inline RS-485/422 function terminal for serial data transmissionIB IL RS 485/422-PRO-PAC

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