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Study of operation strategies for integrating ice-storage district cooling systems into power dispatch for large-scale hydropower utilization

机译：将蓄冰区域冷却系统集成到大规模水电利用的电力调度中的运行策略研究

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摘要

Hydropower curtailment for the run-of-over stations has become serious in Southwest China. The ice-storage district cooling system is believed as an effective approach to provide flexibility for hydropower utilization. However, the existing ice-storage operation strategies in demand-side management cause that the ice storage cannot be adjusted in real-time to match the surplus hydropower, which brings difficulties for large-scale hydropower utilization. Therefore, this paper proposed the integration of ice-storage district cooling systems into power dispatch based on smart grid. Two operation strategies were developed for the integration to achieve power supply-side management of ice-storage district cooling system. One is the new ice-storage power-linked operation strategy, which was proposed to determine the ice storing/melting capacity in the power dispatch. The other one is the cooling pipelines dynamic-characteristics-considered operation strategy, which was applied in the power dispatch. The dynamic characteristics were calculated based on a linear model to be compatible with the linear constraints in power dispatch models. Finally, effects of two strategies were studied by taking scenes in Chongqing as the example. Results showed that the application of the first strategy only reduces the hydropower curtailment frequency, while application of the second strategy reduces both the curtailment frequency and amount. Furthermore, the simultaneous applications of the above two strategies enhance hydropower consumption by 7.5% (200 million kW.h) and reduce carbon emission by 7.4% (34,000 tons) every year. In addition, there exists an optimal total ice-storage capacity per day, i.e. 8600 MW.h, under which the system's performance reaches the highest value.
机译：在中国西南地区，限制过站发电站的水力发电已成为严重问题。储冰区冷却系统被认为是为水电利用提供灵活性的有效方法。然而，需求侧管理中现有的储冰运营策略导致储冰量无法实时调整以匹配剩余水电，给大规模水电利用带来了困难。因此，本文提出了将冰蓄冷区域冷却系统集成到基于智能电网的电力调度中。为整合实现了两种运行策略，以实现冰存储区域冷却系统的电源侧管理。一种是新的蓄冰电力联动运行策略，该策略用于确定电力分配中的蓄冰/融化能力。另一个是考虑冷却管道动态特性的运行策略，该策略已应用于电力分配中。根据线性模型计算动态特性，以与电力分配模型中的线性约束兼容。最后，以重庆市的场景为例，研究了两种策略的效果。结果表明，第一种策略的应用仅降低了水电削减的频率，而第二种策略的应用则降低了削减水电的频率和数量。此外，上述两种策略的同时应用每年可将水电消耗提高7.5％（2亿千瓦时），碳排放量减少7.4％（34,000吨）。此外，每天还有一个最佳的总冰存储容量，即8600 MW.h，在此之下系统的性能达到最高值。

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