储能参与配电网削峰填谷对网络损耗及电压偏差的影响分析

目的  针对配电网接入储能进行削峰填谷的应用场景开展研究，以明确储能接入对配电网侧网络损耗和电压质量的影响。 方法  分析了高峰时段储能放电时，网损功率随储能注入电流和接入位置的变化趋势，然后分析了低谷时段，储能系统接入并进行充电时，网损功率随储能注入电流和接入位置的变化趋势。对于储能接入配电网进行削峰填谷对配电网电压的影响，分别从高峰时段储能放电和低谷时段储能充电的角度，研究了储能不同注入电流和接入位置对配电网沿线电压分布的影响。最后，考虑配电网总电压偏差指标，研究了配电网接入储能后对总电压偏差指标的影响。 结果  通过仿真计算，分析了储能电流和接入位置取不同固定或连续值时储能参与配电网削峰填谷对网损功率和电压损耗的影响趋势，并与理论分析进行了对比分析。 结论  研究将对各类储能设施在配电网中的协调规划和优化运行提供有益参考，具有较好的工程参考价值。

Impact Analysis of Energy Storage Participating in Peak Shaving and Valley Filling for Distribution Network on Network Loss and Voltage Deviation

Introduction The application scenarios of peak shaving and valley filling by energy storage connected to the distribution network are studied to clarify the influence of energy storage access on network losses and voltage quality on the distribution network side. Method The paper analyzed the change trend of network loss power with the energy storage injection current and access position during peak hours of energy storage discharge, and then analyzed the change trend of network loss power with the energy storage injection current and access position when the energy storage system was connected and charged during valley hours. For the influence of energy storage connected to the distribution network for peak shaving and valley filling on the voltage of the distribution network, the influence of different energy storage injection currents and access positions on the voltage distribution along the distribution network was studied from the perspective of energy storage discharge during peak hours and energy storage charging during valley hours. Finally, considering the total voltage deviation index of the distribution network, the influence on the total voltage deviation index after the distribution network which was connected to energy storage was studied. Result Through simulation calculations, the influence trend of energy storage participating in peak shaving and valley filling for the distribution network on network loss power and voltage loss is analyzed when different fixed or continuous values of energy storage current and access position are taken, and it is compared with theoretical analysis. Conclusion The study will provide useful references for the coordinated planning and optimized operation of various energy storage facilities in the distribution network, and it has good engineering reference value.