Confirmation of Correlation Between Hourly Electric Power and Instantaneous Maximum Power of Rectifiers for Railway

Multipurpose Optimization Method for Energy Storage System Specification Using Measurement Data of DC Traction Substations

“…In an earlier study, we proposed a method to calculate the voltage drop of a TPSS considering the discharge current from the ESS, and a similar method was used [24]. The calculation method for discharging the ESS is presented in Refs [2–6], and each equation is explained below. In this study, the required discharge of the ESS at time $$$ t $$$, $$$ {P}_{ESS}^{out\_ req}(t) $$$, was the minimum value of the ESS output $$$ {P}_{ESS}^{out\_ temp}(t) $$$, which satisfied [3–6].…”

“…The calculation method for discharging the ESS is presented in Refs [2–6], and each equation is explained below. In this study, the required discharge of the ESS at time $$$ t $$$, $$$ {P}_{ESS}^{out\_ req}(t) $$$, was the minimum value of the ESS output $$$ {P}_{ESS}^{out\_ temp}(t) $$$, which satisfied [3–6]. Equation (3) indicates the constraint for maximum ESS output, whereas $$$ {P}_{ESS}^{out\_ temp}(t) $$$ was obtained from Ref.…”

“…Equation (3) indicates the constraint for maximum ESS output, whereas $$$ {P}_{ESS}^{out\_ temp}(t) $$$ was obtained from Ref. [4]. Two types of feeding methods are used for DC TPSS: one‐side and parallel.…”

“…One of the problems encountered by railway companies owing to the large size of electric facilities is an increase in operating and maintenance costs. In the case of DC TPSS, the instantaneous maximum power (in kW) is used as an index for designing the installed capacity of transformers and rectifiers in a traction substation (TS) [4]. The characteristic feature of traction loads is that their instantaneous maximum power is large; therefore, the receiving and transforming facilities tend to be large and receive power at high voltages.…”