A New Cooperative Current-Sharing Control of Parallel Chargers for Energy Storage Type Light Rail Vehicles

2014 ◽  
Vol 47 (3) ◽  
pp. 9438-9443 ◽  
Author(s):  
Jiangang Liu ◽  
Zhiwu Huang ◽  
Jun Peng ◽  
Weirong Liu ◽  
Kai Gao
Keyword(s):  
Energy Storage ◽  
Light Rail ◽  
Current Sharing ◽  
Rail Vehicles ◽  
Current Sharing Control ◽  
Storage Type

scholarly journals Distributed Cooperative Current-Sharing Control of Parallel Chargers Using Feedback Linearization

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Jiangang Liu ◽  
Zhiwu Huang ◽  
Jing Wang ◽  
Jun Peng ◽  
Weirong Liu
Keyword(s):  
Feedback Linearization ◽  
Test System ◽  
Light Rail ◽  
Charging System ◽  
Imbalance Problem ◽  
Current Sharing ◽  
Current Sharing Control ◽  
Lasalle Invariant Principle ◽  
Output Information ◽  
Storage Type

We propose a distributed current-sharing scheme to address the output current imbalance problem for the parallel chargers in the energy storage type light rail vehicle system. By treating the parallel chargers as a group of agents with output information sharing through communication network, the current-sharing control problem is recast as the consensus tracking problem of multiagents. To facilitate the design, input-output feedback linearization is first applied to transform the nonidentical nonlinear charging system model into the first-order integrator. Then, a general saturation function is introduced to design the cooperative current-sharing control law which can guarantee the boundedness of the proposed control. The cooperative stability of the closed-loop system under fixed and dynamic communication topologies is rigorously proved with the aid of Lyapunov function and LaSalle invariant principle. Simulation using a multicharging test system further illustrates that the output currents of parallel chargers are balanced using the proposed control.

Generalized Potential Function-Based Cooperative Current-Sharing Control for High-Power Parallel Charging Systems

2017 ◽  
Vol 21 (3) ◽  
pp. 387-396
Author(s):  
Hongtao Liao ◽  
◽  
Jun Peng ◽  
Yanhui Zhou ◽  
Zhiwu Huang ◽  
...  
Keyword(s):  
Potential Function ◽  
Cooperative Control ◽  
Control Method ◽  
Light Rail ◽  
Current Sharing ◽  
Vehicle Systems ◽  
Gradient Based ◽  
Current Sharing Control ◽  
Artificial Potential Function ◽  
The Stability

In this paper, a new decentralized gradient-based cooperative control method is proposed to achieve current sharing for parallel chargers in energy storage-type light rail vehicle systems. By employing a generalized artificial potential function to characterize the interaction rule for subchargers, the current-sharing control problem is converted into an optimization problem. Based on the gradient of the potential function, a decentralized gradient cooperative control law is derived. A general saturation function is introduced in the proposed control to guarantee the boundedness of the control output. The stability of the closed-loop system under the proposed decentralized gradient control is proven with the aid of a Lyapunov function. Simulation results are provided to verify the feasibility and validity of the proposed distributed current-sharing control method.

TriMet MAX Energy Storage Substation: Updates on Commissioning, Optimization and Operating Experience

2018 ◽  
Author(s):  
Kinh D. Pham ◽  
Kai Looijenga ◽  
Gene Wallis ◽  
Thomas Heilig ◽  
Xavier Ramirez
Keyword(s):  
Energy Storage ◽  
Energy Savings ◽  
Operating Experience ◽  
Cost Savings ◽  
System Stability ◽  
Light Rail ◽  
Super Capacitor ◽  
Voltage Stabilization ◽  
Rail Vehicles ◽  
Traction Power Supply

This paper provides an update to the 2015 paper titled “A New Energy Storage Substation for the Portland to Milwaukie Light Rail (PMLR) Extension” [4] presented at the 2015 JRC in San Jose. The energy storage substation (ESS) with super-capacitor technology manufactured by Siemens was installed in place of a utility-connected substation at the Tacoma substation location to capture the energy generated by braking light rail vehicles and store it in the ESS energy savings mode and feed it back to the traction power supply during vehicle acceleration. In voltage stabilization mode, the ESS will enable the rail system to maintain voltage system stability by ensuring the system voltage to remain within the required voltage ranges and prevent system disruptions due to low system voltage conditions. In the Fall 2015, the Tacoma ESS went into service as part of the PMLR Orange Line light rail extension. This paper presents the design concepts for the unit, briefly discusses installation and testing, and focuses on the optimization process, operating experience, energy savings and reliability. TriMet operates a fleet of 145 light rail vehicles on its 60 mile network. Approximately 75% of the energy regenerated during braking is captured and re-used, saving an estimated $1.8 M annually in energy cost. The Tacoma ESS capacity is approximately 2.5 kWh. The unit normally operates in energy savings mode, maximizing recovery and re-use of braking energy while the secondary voltage stabilization mode is available to maintain system operation during outage conditions. After more than two years of revenue service operation, detailed operating data is presented and analyzed, including reliability information and actual energy and cost savings.

Supercapacitors On-Board Light Rail Vehicles: Enhanced Energy Storage Systems for Improved Vehicle Efficiency

2008 ◽  
Author(s):  
Joeri Van Mierlo ◽  
Ricardo Barrero ◽  
Xavier Tackoen
Keyword(s):  
Energy Storage ◽  
Power Flow ◽  
Energy Savings ◽  
Storage Systems ◽  
Energy Content ◽  
Light Rail ◽  
Energy Storage Systems ◽  
Rail Vehicles ◽  
Vehicle Load ◽  
Voltage Variation

This article will propose different energy storage systems, ranging from 0.91 kWh to 1.56 kWh, suitable for a 30 m long tram. To configure the system regarding energy content, voltage variation, maximum current and power losses, a model of the tram, network and substations power flow has been developed in a Matlab/Simulink environment. Results obtained in energy savings at substation level vary from 24% to 27, 6% under the same driving profile and auxiliaries load; while at the end-of-life of supercapacitors, the range varies from 18, 1% to 25, 1% depending on the supercapacitor module used and vehicle load.

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