在西非，电力系统面临着许多挑战，首当其冲的是电力供应能力依然不足。然而西非地区拥有丰富的太阳能资源。可以预期，未来太阳能项目将会得到蓬勃发展，从而改变电力供应不足的现状。随着太阳能等可再生能源的出现，电网面临着一些新挑战，其中包括电网稳定性的问题以及调度管理的问题。随着近些年来储能技术价格的迅速下降，储能技术为解决上述问题提供了一种技术途径，形成了新的行业增长点。预计储能技术将成为未来能源的核心环节，能够提高电网稳定性、发挥削峰填谷作用，同时发挥多种其他功能。本论文提供了储能技术在塞拉利昂起到削峰填谷作用的一个应用实例，并且对该储能技术配置方式的技术经济性进行了分析。该地区热力发电机组逐步老化退役，水力发电具有显著的季节波动性，因此该地区计划在2020年完成100MW的太阳能发电装机。本课题研究的目标，是确定能够解决电力源头侧波动问题的储能技术选择，并评估其经济可行性。模型计算和分析结果表明，在塞拉利昂的实际情况下，如果太阳能装机达到100MW，储能技术利用峰谷电价差产生的经济收益不足以满足模型假设条件下的经济可行性需求。针对50MW/200MWh项目的敏感性分析表明，如果能够获得相当于85%初投资规模的经费补贴，或者电池装机能够取得260$/kW/年的额外附加经济收益，则项目具有经济可行性。而降低贷款利率至0%无法对项目的可行性产生显著影响。研究工作还表明虽然仅仅依靠峰谷差经济收益无法使项目具有可行性，但是储能技术的应用具有其他多种收益。最后，本研究还发现在塞拉利昂的实际情况下，热电厂优惠的电力订购协议对储能项目的实施具有负面作用，未来将针对这一点做进一步深入研究。储能系统；西非；电池；塞拉利昂；削峰填谷

In West Africa, the electricity sector is characterized by numerous challenges, at the forefront of which the lack of access to electricity remains the key concern. It is however also richly endowment with solar resources which let us foresee a bright and close future of blossoming solar projects that could be game changing. With the emergence of these variable renewable energies, many more challenges will have to be tackled on the grid among which the need for increased reserve for grid stability or the need for further dispatch management. Storage has seen a surge of new businesses in last decade thanks to a sharp cost decline in recent years. Their role on-grid is foreseen to be central in the energy mix of tomorrow, providing grid stability services and solar peak-shaving among multiple other applications.The study presented in this report targets the specific application of peak shaving in Sierra Leone and proposes an assessment of storage techno-economic value in such configuration. Considering a prospective target of 100MW solar that would be installed by 2022 to tackle the issue of aging and expensive thermal capacities coupled to seasonal hydro production, the objective of the study was to identify the characteristics of a best suitable storage project that would allow solar peak production shift and thermal generation displacement, while assessing its economic viability. Based on a dispatch model and analysis, the study showed that, considering Sierra Leone’s specific context, peak-shaving revenues when addressing the need of a 100MW solar capacity are not sufficient to meet the economic viability under the model assumptions. A sensitivity analysis performed on an illustrative 50MW/200MWh project has shown that the attribution of grants amounting for 85% of the CAPEX or the additional remuneration of the battery under the form of a 260$/kW/y capacity payment could make such a project viable, while decreasing the interest debt to 0% doesn’t have significant impact on project viability. Beside showcasing the difficulty to realize a viable solar peak-shifting storage project, the case demonstrated the benefits of stacking revenues from multiple applications of the storage capacities. Finally, the study could also identify for the specific case of Sierra Leone’s grid that a thermal unit benefiting from advantageous PPA conditions could be responsible for serious hindrance to storage support to solar penetration in the national power mix.