Abstract
The control and operation of a single-phase 13-level power conditioning system (PCS) for peak power reduction of a high-speed railway substation (HSRS) are proposed. This PCS is a single-phase 3100 V, 2 MVA 13-level H-bridge multi-level inverter structure. It has excellent power quality. It is easy to serialize by voltage. In addition, the DC bus power of each cell inverter is supplied by lithium-ion batteries. The generalized reduction gradient optimization algorithm based on past load pattern is applied to the power management system for peak power reduction of HSRS. The phase detector and power controller for the control of a single-phase PCS based on virtually coordinated axes using an all-pass filter are expected to be robust to external disturbances with fast response characteristics. This study also proposes an adapted select switch (ASS) method that can change the switching depending on the operation state of PCS and the state of charge (SOC) of the battery to minimize battery imbalance by controlling each cell inverter of the H-bridge. The validity of the proposed system was confirmed by PSiM simulation and experiments using a demonstration system of 6 MW PCS and 2.68 MWh batteries at one of Gyeongbu high-speed line substations in Korea.
Highlights
With the increase of traffic volume and traffic congestion due to industrial development and urban population concentration, measures to solve traffic problems are seriously highlighted
The peak power reduction system (PPRS) demo system consisting of 6 MW power conditioning system (PCS) and 2.68 MWh batteries was installed at the Korean railroad (KORAIL) substation under commercial operation to verify the effectiveness of the PPRS for high-speed railway substation (HSRS)
The PCS’s power operation was provided with the interface through power management system (PMS), which was developed for HSRS
Summary
With the increase of traffic volume and traffic congestion due to industrial development and urban population concentration, measures to solve traffic problems are seriously highlighted. The on-board system has the advantage of optimally utilizing the regenerative energy by mounting an energy storage device on the vehicle, it has disadvantages of increasing the weight of the vehicle and constraining the installation space [13,14] For this reason, installing energy storage systems at the station using high-power and large capacity energy storage systems (ESSs), such as a flywheel [10], electric double layer capacitors (EDLCs) [11], or Li-ion batteries [12], has been considered. ESSs are usually installed in three-phase systems for the purpose of peak power reduction and power stabilization [15,16,17] These systems could not apply directly to special loads, such as HSRSs; because HSRSs use a high-voltage large-power single-phase power system, load fluctuations are much greater than normal loads [18]. The effectiveness and the feasibility of the proposed system were verified by installing a demonstration system of
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