Small-Signal Stability Assessment and Active Stabilization of a Bidirectional Battery Charger

Iyer, Vishnu Mahadeva; Gulur, Srinivas; Bhattacharya, Subhashish

doi:10.1109/tia.2018.2871101

Cited by 73 publications

(25 citation statements)

References 26 publications

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“…During the T 1 period, the MIC circuit is operated in Mode VI. In the meantime, V L will be the difference of V O1 and V DC , as shown in Equation (17). Besides, T 1 will be equal to the conduction time of S 1 , as Equation (18) shows:…”

Section: The Charging Scenariomentioning

confidence: 99%

“…In addition, a battery charger consisting of DC-DC converters integrated with the pulse-width-modulation (PWM) technology is necessary to control the battery energy [11][12][13]. Moreover, the bidirectional power flow control of the battery charger is also an essential function to realize both charging and discharging ability for the battery [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Bidirectional Power Flow Control of a Multi Input Converter for Energy Storage System

Tang

Lin

2019

Energies

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The objective of this paper is to propose a multi-input DC-DC converter with bidirectional power flow control capability. Compared to the traditional power converter, the multi-input converter (MIC) can save on the number of components and the circuit cost. Under normal conditions, the MIC is able to transfer energy from different input sources to the load. However, if the battery module is adopted, both the charging or discharging features should be considered. Therefore, the bidirectional power flow control of the MIC is necessary. On the other hand, because of the inconsistency characteristics of batteries, unbalanced circuit operation might occur whereby the circuit and the battery might be damaged. Therefore, dynamic current regulation strategies are developed for the MIC. Consequently, the proposed MIC circuit is able to achieve the bidirectional power flow control capability as well as control the input currents independently. Detailed circuit analysis and comprehensive mathematical derivation and of the proposed MIC will be presented in this paper. Finally, both simulation and experimental results obtained from a 500 W prototype circuit verify the performance and feasibility of the proposed bidirectional multi-input converter.

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Section: The Charging Scenariomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bidirectional Power Flow Control of a Multi Input Converter for Energy Storage System

Tang

Lin

2019

Energies

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“…This can reduce test costs and shorten the development cycle compared with offline simulation [4,5]. However, simulating multiple high-frequency EV chargers real-time in small steps is a significant challenge due to the need for detailed devicelevel modeling of power electronic converters (PECs) and accurate interactions [6,7]. Therefore, it is valuable to develop an efficient real-time simulation algorithm and implementation method for the system.…”

Section: Introductionmentioning

confidence: 99%

FPGA-based real-time simulation for EV station with multiple high-frequency chargers based on C-EMTP algorithm

Wang

et al. 2020

Prot Control Mod Power Syst

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The electric vehicle (EV) charging station is a critical part of the infrastructure for the wide adoption of EVs. Real-time simulation of an EV station plays an essential role in testing its operation under different operating modes. However, the large numbers of high-frequency power electronic switches contained in EV chargers pose great challenges for real-time simulation. This paper proposes a compact electromagnetic transient program (C-EMTP) algorithm for FPGA-based real-time simulation of an EV station with multiple high-frequency chargers. The C-EMTP algorithm transforms the traditional EMTP algorithm into two parallel sub-tasks only consisting of simple matrix operations, to fully utilize the high parallelism of FPGA. The simulation time step can be greatly reduced compared with that of the traditional EMTP algorithm, and so the simulation accuracy for high-frequency power electronics is improved. The EV chargers can be decoupled with each other and simulated in parallel. A CPU-FPGA-based real-time simulation platform is developed and the proposed simulation of the EV station is implemented. The control strategy is simulated in a CPU with 100 μs time-step, while the EV station circuit topology is simulated in a single FPGA with a 250 ns time-step. In the case studies, the EV station consists of a two-level rectifier and five dual-active bridge (DAB) EV chargers. It is tested under different scenarios, and the real-time simulation results are validated using PSCAD/EMTDC.

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“…A local impedance-based stability criterion, depending upon the power imbalance conditions, was proposed in [28]- [29] for a distributed system. The stability of the bi-directional dc-dc converter was analyzed using local impedance stability criterion in [30], [31].…”

Section: Introductionmentioning

confidence: 99%

Non-Isolated Fourth-Order Boost DC-DC Converter for Power Management in Low Voltage Low Power DC Grids: Design and Interaction Analysis

2020

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In this paper, a minimum-phase response fourth-order boost dc-dc converter (FBDC) exhibiting continuous input and output current is proposed. A voltage-mode controller is adopted to this converter to perform bus voltage regulation in a low voltage low power dc distribution system (LVPDS). FBDC supports additional load demand by interconnecting a second power source/battery. A systematic steady-state analysis for FBDC is established and the ripple content and other L-C design expressions are derived. The LVPDS is an integration of solar photovoltaic (PV) source using a conventional dc-dc boost converter (CBDC), and constant power load using a conventional dc-dc buck converter (CBuC). In this LVPDS, the FBDC primarily ensures dc bus voltage regulation, CBDC ensures the maximum power point tracking (MPPT) while CBuC regulates the load voltage. Various transfer function models, formulated through small-signal analysis, are used to address the controller design aspects and interconnected LVPDS stability issues. A generalized small-signal model of LVPDS is also developed to analyze the subsystem interactions arising during the coherent operation of BRC in this multi-converter system. The impact of connecting FBDC, as BRC, with other converters in the LVPDS is also analyzed. The laboratory prototype of a 48 V LVPDS is developed for experimental validation of bus voltage regulation and subsystem interactions. The theoretical and experimental results are found to be in close correlation with each other. INDEX TERMS Fourth-order DC-DC Boost converter, Small-signal model, power stage design optimization, Particle swarm optimization, Low voltage low Power dc distribution systems NOMENCLATURE Bus voltage regulating converter BRC Bus voltage and Bus-side current vbus, ibus Conventional boost converter CBDC Characteristics Equation LVPDS CE Control-to-bus volt TF of BRC Gvd(s)B-o, Continuous input continuous output CICO Equivalent bus impedance of source and load converter Z(s)SL

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Small-Signal Stability Assessment and Active Stabilization of a Bidirectional Battery Charger

Cited by 73 publications

References 26 publications

Bidirectional Power Flow Control of a Multi Input Converter for Energy Storage System

Bidirectional Power Flow Control of a Multi Input Converter for Energy Storage System

FPGA-based real-time simulation for EV station with multiple high-frequency chargers based on C-EMTP algorithm

Non-Isolated Fourth-Order Boost DC-DC Converter for Power Management in Low Voltage Low Power DC Grids: Design and Interaction Analysis

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