Solar energy yields in real time

Overview

Photovoltaic park  

The Kieswerk photovoltaic park near Freienhufen

  • Envalue GmbH installs and operates solar parks for investors and has numerous references throughout Europe.
  • The most diverse range of operating conditions need to be continuously measured in order to respond quickly to any malfunctions.
  • Envalue uses a system solution from Phoenix Contact to record and transfer the data from the solar park.
  • The industrial quality of its components ensures maximum reliability and profitable maintenance in the event of a system failure.

Customer profile

Envalue GmbH, Hofkirchen, specializes in installing and operating solar parks for investors. The company has numerous references throughout Germany and Europe.

Application

Among other sites, Envalue operates the Kieswerk solar park near Freienhufen with a total output of around 3.1 MWp. In the park, around 13,000 crystalline modules are permanently elevated and combined into 528 strings. The solar park, encompassing an area of approximately 52 hectares, is divided into three sections, each allocated to one inverter respectively. These convert the DC voltage into AC voltage and then feed a transformer which converts it to 20 kV. The generated AC voltage is then transmitted by underground cables to the grid connection point approximately five kilometers away.

Even large solar parks do not generally have a permanently manned control room on site. Meanwhile, operators and investors are always keen to ensure maximum system returns. That's why the operating conditions such as currents, voltages, direct sunlight, and many others must be continuously measured in order to respond quickly to any malfunctions. A robust system solution, which is able to cope with the special requirements of industrial environments, is required in order to record and transmit the data.

Solution

String fuse  

Each string is protected individually

The measuring chain starts with the strings: either 16 or 24 strings are merged and individually saved in the string combiner box (SCB). One double string each is routed through one of the SOLARCHECK module openings in order to record the string currents. Likewise, the voltage and ambient temperature can also be recorded with the SOLARCHECK measuring module. The analog data is processed in a measuring module, digitized, and then sent on via Modbus protocol.

VALVETRAB surge protection for the DC area and PLUGTRAB for securing the communication line, a Uno power supply and connection technology from Phoenix Contact round off the range of SCB equipment used. The collected DC current is transmitted to the inverter via an isolator. The data from all SCBs and inverters and data from the substation's network connection point converge in the data logger cabinet. Installed there as a core component is an ILC 191 Inline controller, which is used to run the photovoltaic management application that was programmed from the Solarworx library's function blocks.

Rüdiger Haslinger, Project Manager at Envalue, explains, “The function blocks from the Solarworx library let you read the data from all commercially available inverters, which has simplified our programming. The support offered by the Phoenix Contact team is also excellent when it comes to connection.” One particular challenge is connection to the control system of direct sellers. But even this is possible without substantial programming effort.

Control cabinet with tablet for the Smartblue portal  

A fault is quickly detected on the Smartblue portal

A Smartblue perspective

The complete system overview, which comprises regularly updated current and voltage values for the double strings, inverter data, and ambient park conditions, such as temperature, solar radiation intensity, and many other things, is collected in 1 to 5 minute intervals and sent every 15 minutes to the Smartblue software manufacturer's server in Munich via the Internet. Here, valuable information is created from the bare numerical sequences.

Special software routines have been developed in order to filter out the relevant information quickly. Error messages with the same cause are summarized in a single message, for instance. Recurring error messages generate a so-called stacking fault that is displayed only once on the control station. For example, in practice this means that a defective module, a blown fuse in the SCB or a loose connector in a string is quickly detected.

Summary

When asked what sets Phoenix Contact apart from other solutions in the photovoltaic sector, Rüdiger Haslinger didn't take long to respond: “The difference lies in Phoenix Contact's robust industrial quality. In contrast to our competitors' measurement boards, where the strings are connected directly, the SOLARCHECK measuring module, for example, does not generate heat since measurements are contactless.”

Products

DescriptionTypeOrder No.
SCK measuring module for monitoring photovoltaic systemsSCK-M-I-8S-20A2903241
SCK measuring module for monitoring photovoltaic systemsSCK-M-I-4S-20A2903242
SCK measuring module for monitoring photovoltaic systemsSCK-M-U-1500V2903591
SCK communication moduleSCK-C-MODBUS2901674
Inline controllerILC 191 ETH 2TX2700976
Program and configuration memorySD FLASH 2GB APPLIC A2701190
Inline RS-485/422 function terminalIB IL RS 485/422-PRO-PAC2863627
Primary-switched UNO POWER power supplyUNO-PS/1AC/24DC/ 60W2902992
Primary-switched QUINT POWER power supplyQUINT-PS/1AC/24DC/52866750
Uninterruptible power supply with IQ technologyQUINT-UPS/24DC/24DC/52320212
Industrial UMTS/GSM router with Ethernet interfacePSI-MODEM-3G/ROUTER2314008
Ethernet switch, 4 TP RJ45 ports, 1 FO port, 100 MbpsFL SWITCH SFNB 4TX/FX2891027
Ethernet switch, 4 TP RJ45 ports, 1 FO port, 100 MbpsFL SWITCH SFNB 4TX/FX SM2891029
Fuse, 10.3 mm x 38 mm, up to 1000 V DCFUSE 10,3X38 15A PV3061348
Surge protective device for 2-pos. isolated DC voltage systems (1000 V DC)VAL-MS 1000DC-PV/2+V2800628
Universal pluggable lightning current arrester/surge protective deviceVAL-MS-T1/T2 335/12.5/1+12800187
Surge protection plug for base elementPT 3-PB-ST2858030
DescriptionTypeOrder No.
SCK measuring module for monitoring photovoltaic systemsSCK-M-I-8S-20A
SCK measuring module for monitoring photovoltaic systemsSCK-M-I-4S-20A
SCK measuring module for monitoring photovoltaic systemsSCK-M-U-1500V
SCK communication moduleSCK-C-MODBUS
Inline controllerILC 191 ETH 2TX
Program and configuration memorySD FLASH 2GB APPLIC A
Inline RS-485/422 function terminalIB IL RS 485/422-PRO-PAC
Primary-switched UNO POWER power supplyUNO-PS/1AC/24DC/ 60W
Primary-switched QUINT POWER power supplyQUINT-PS/1AC/24DC/5
Uninterruptible power supply with IQ technologyQUINT-UPS/24DC/24DC/5
Industrial UMTS/GSM router with Ethernet interfacePSI-MODEM-3G/ROUTER
Ethernet switch, 4 TP RJ45 ports, 1 FO port, 100 MbpsFL SWITCH SFNB 4TX/FX
Ethernet switch, 4 TP RJ45 ports, 1 FO port, 100 MbpsFL SWITCH SFNB 4TX/FX SM
Fuse, 10.3 mm x 38 mm, up to 1000 V DCFUSE 10,3X38 15A PV
Surge protective device for 2-pos. isolated DC voltage systems (1000 V DC)VAL-MS 1000DC-PV/2+V
Universal pluggable lightning current arrester/surge protective deviceVAL-MS-T1/T2 335/12.5/1+1
Surge protection plug for base elementPT 3-PB-ST

PHOENIX CONTACT Middle East FZ LLC

Office 301, Third Floor, Block 10
Dubai International Academic City (DIAC)
P.O. Box 345002
Dubai, United Arab Emirates
+971 4 4370324
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