Experimental Measurements for Evaluating the Efficiency of the Thermal Energy Storage Unit Used at a Subway Traction Substation to Receive Excessive Regeneration Energy

This study provides data on estimating the volume of excessive regeneration energy in the traction power supply system of the Moscow Metro and about technical means for its treatment using various types of energy storage units. The design of the thermal energy storage unit and the flowsheet of its hookup to the traction network are presented. The main design and control system elements are described, as well as the features of the cooling agent and the operating principle of the entire thermal energy storage system. The results of experiments with a stationary electric energy storage unit that are conducted for treating excessive regeneration energy at an operating traction substation of the Moscow Metro are used. The results of statistical processing of energy consumption are presented, as well as the current and voltage oscillograms of the storage unit. These oscillograms show current and voltage oscillations in the real-time mode during the day. A method is presented for estimating the average electrical power consumption of excessive regeneration energy, which is subsequently converted to thermal energy. The experimental data are used to estimate the possible area of heating the subway premises using the excessive generation of energy produced by train braking.