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FOLLOW-ON-ACTIVITIES#300KW PELLWORM SOLAR PLANT

Objective


System modifications to the photovoltaic power plant at Pellworm were necessary in order to increase the reliability and availability of the plant under changing operational parameters caused by ageing batteries and increasing consumer power demand.

The following improvements in the 300 kW plant were carried out:
software splitting to separate the system control and the data acquisition systems;
improving energy output by a modification of energy management;
installing a monitoring panel;
installing a modem.

Constantly, more battery problems are arising and the control problem becomes more complicated because of the aged batteries.
THE CONTRACTUAL OFFICIAL ACCEPTANCE TESTS OF THIS PLANT WERE FULFILLED IN JULY 1983. SINCE THAT DATE THE PLANT OPERATOR'S OBLIGATION WAS TO OPERATE THE PLANT FOR AT LEAST 5 YEARS. THIS PROJECT HAS BEEN SPONSORED BY THE GERMAN MINISTRY OF RESEARCH AND TECHNOLOGY (BMFT) AND THE EUROPEAN COMMUNITY. IN THE MEANTIME, EXTENSIVE EXPERIENCE UNDER REALISTIC AMBIENT OPERATION CONDITION AND A LOT OF KNOWLEDGE HAS BEEN GAINED ON TECHNICAL AND NON-TECHNICAL ISSUES. BASED ON OVER 5 YEARS OF EXPERIENCE WITH THIS PLANT A MODIFICATION WAS PERFORMED. THIS WORK CONCERNED MORE THE SOFTWARE THAN THE HARDWARE. THE MAIN GOAL WAS TO OPTIMIZE THE KWH-OUTPUT BY INCREASING THE OVERALL RELIABILITY AND AVAILABILITY VIA A SIMPLIFICATION OF THE OPERATING MODES AND SIGNIFICANTLY IMPROVE THE PLANT EFFICIENCY ON BOTH ON-SITE AND OFF-SITE OPERATION AND MONITORING EFFORT. THEREFORE, THE FOLLOWING ACTIONS WERE OR WILL BE IMPLEMENTED ON THE EXISTING PHOTOVOLTAIC PLANT OF PELLWORM.

CURRENT ACTIONS

- SOFTWARE SPLITTING
THIS WORK IS DONE TO ORGANIZE A SEPARATION OF THE SYSTEM CONTROL EQUIPMENT AND THE DATA ACQUISITION SYSTEM. A SEPARATE DATA ACQUISITION SYSTEM WILL BE INSTALLED.
- IMPROVING THE ENERGY OUTPUT
THIS INVOLVES A MODIFICATION OF THE ENERGY MANAGEMENT. SPECIALLY, OPERATION PARAMETERS OF THE BATTERY ARE CHANGED AND THE TWO BUS BAR SYSTEMS WITH IT'S TWO SEPARATED BATTERY BLOCKS IS CONVERTED INTO A ONE BUS BAR SYSTEM (SPECIAL CARE HAS TO BE TAKEN FOR THE TREATMENT OF AGED BATTERIES).
- MONITORING PANEL
A MONITORING PANEL FOR THE INDICATION OF SIGNIFICANT PLANT OPERATION DATA WITH REMOTE CONTROL SWITCHES FOR THE OPERATOR'S ATTENTION IS INSTALLED IN THE RECREATION CENTER.
- LOAD MANAGEMENT
THE INSTALLATION OF AN AUTOMATIC LOAD MANAGEMENT SYSTEM IS NOT POSSIBLE DUE TO A PERMANENT INCREASE OF CONSUMERS WITH CHANGING PRIORITIES. LIGHT SIGNALS WHICH CALL FOR MANUAL ACTIONS WILL BE PROPOSED. AN AUTOMATIC POSSIBILITY TO SUPPLY THE RECREATION CENTER FROM THE PUBLIC GRID AT NIGHT (CHEAP ELECTRICITY) IS SET UP.
- MODEM CONNECTION
INFORMATION ON THE PLANT STATUS AND MEASURED DATA WHICH ARE PRESENTLY AVAILABLE ON THE VIDEO TERMINAL AT THE PLANT WILL BE MADE AVAILABLE AT TELEFUNKEN SYSTEMTECHNIK (FORMER AEG) FACILITIES IN WEDEL (160 KM AWAY) VIA MODEM.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Allgemeine Elektrizitäts Gesellschaft AG (AEG)
Address
Goldsteinstraße 235
60528 Frankfurt Am Main
Germany