Abstract
The German Renewable Energy Resources Act 2012 provides incentives for operating biogas plants in a flexible way, i.e., producing electricity in times of high prices and storing biogas during times of low prices. Frequent starts and shutdowns of the combined heat and power unit (CHP), however, lead to excessive and irregular wear and tear. Conventional maintenance schedules just take the CHP’s operating hours into account, thus implying constant wear and tear. Therefore, their use is not appropriate for a flexibly operated plant. Applying such an inappropriate maintenance strategy might lead to a lower availability of the plant and lost revenues. To overcome this gap, we introduce the Long-term Electricity production Planning Problem (LEPPP) that determines both the long-term strategy for electricity production and the optimal dates for scheduled maintenance activities simultaneously. Furthermore, we present the numerical results of a case study using data of an existing biogas plant.
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