N-1-Secure Optimal Generator Redispatch in Hybrid AC-DC Grids with Energy Storage
N-1-Secure Optimal Generator Redispatch in Hybrid AC-DC Grids with Energy Storage
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DOI：
10.1109/isgteurope.2018.8571779
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发表时间：
2018-10
期刊：
影响因子：
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通讯作者：
Nico Meyer-Hübner;M. Suriyah;T. Leibfried
中科院分区：
文献类型：
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作者：
Nico Meyer-Hübner;M. Suriyah;T. Leibfried
提出了一种n-1安全的动态最优潮流，使发电机再调度费用，即与日前调度的偏差最小。它是基于一个完整的交流潮流制定，其中电压和线路容量的限制，包括所有指定的n-1情况。发电机可用于预防或纠正控制模式。叠加的多端直流电网（MTDC）通过转换器连接，转换器能够在意外情况下正确地调整其功率设定点。优化包括时间范围，并且根据对负荷和可再生能源（RES）的预测来确定。因此，可以考虑发电机斜坡率和储能系统（ESS），同时优化MTDC和ESS，以实现n-1安全性并最大化RES馈入。该方法的功能在一个全面的5总线测试系统中得到了验证。结果表明，一个存储设备可以有效地平衡波动的RES。此外，预防性发电机再调度可以减少通过保留正或负的容量，这取决于存储位置相对于意外事故。
An n-1-secure dynamic optimal power flow is presented where generator redispatch costs, i.e. the deviation from a day-ahead dispatch, are minimized. It is based on a full ac power flow formulation, where voltage and line capacity constraints are included for all specified n-1 cases. Generators can be used in preventive or corrective control mode. An overlaying Multi Terminal DC Grid (MTDC) is connected via converters which are able to correctively adapt their power set points in case of a contingency. The optimization comprises a time horizon and is determined from forecasts on load and Renewable Energy Sources (RES). Generator ramp rates and Energy Storage Systems (ESS) can thus be considered and both MTDC and ESS are optimized simultaneously to achieve n-1-security and maximize RES feed-in. The functionality of the approach is demonstrated in a comprehensive 5-bus test system. Results show that a storage device can effectively balance the fluctuating RES. Furthermore, preventive generator redispatch can be reduced by reserving positive or negative capacity, depending on the storage location relative to the contingency.