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Cost assessment of efficiency losses in hydroelectric plants

机译：水电厂效率损失的成本评估

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摘要

Some important real-time tasks of the independent system operator (ISO) are the monitoring and control of power system events (load deviations and contingencies). These events are usually managed by the ISO using operating reserve ancillary services. These services represent an additional capacity (MW) available in generators and some interruptible loads. Generators must change their operating points in order that this capacity can remain available. These changes might lead to efficiency losses in energy production. In systems with a high percentage of hydroelectric production, hydroelectric plants need to know the impact of ancillary services on their profits. This work therefore analyzes the cost of efficiency losses due to operating reserve availability in hydroelectric generators. A method to calculate this cost component is proposed using a unit commitment dispatch for a single hydroelectric plant. This dispatch is performed without considering the operating reserve availability and is compared with the traditional dispatch, which takes into account the availability of operating reserve. The proposal is used to calculate the cost of efficiency losses on a Brazilian hydroelectric generator. We found that the cost of efficiency losses can be considerable when compared to the incomes of a hydroelectric plant in the short-term market.
机译：独立系统操作员（ISO）的一些重要实时任务是监视和控制电力系统事件（负载偏差和突发事件）。这些事件通常由ISO使用运营储备辅助服务来管理。这些服务代表了发电机和某些可中断负载中可用的额外容量（MW）。发电机必须更改其工作点才能保持该容量。这些变化可能导致能源生产效率损失。在水力发电量较高的系统中，水力发电厂需要了解辅助服务对其利润的影响。因此，这项工作分析了由于水力发电机的运行储备可用性而导致的效率损失成本。提出了一种使用单个水力发电厂的机组承诺调度来计算此成本成分的方法。执行此调度时不考虑运营储备的可用性，并且将其与考虑了运营储备可用性的传统调度进行比较。该提案用于计算巴西水力发电机效率损失的成本。我们发现，与短期市场中水力发电厂的收入相比，效率损失的成本可能相当可观。

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