Integrated multilevel converter and battery management

A cascaded H-bridge multilevel converter is proposed as a BLDC drive incorporating real-time battery management. Intelligent H-bridges are used to monitor battery cells whilst simultaneously increasing their performance by reducing the variation between cells and controlling their discharge profiles

A cascaded H-bridge BLDC drive incorporating battery management

A multilevel BLDC drive is proposed using cascaded H-bridges with isolated sources to provide superior output waveforms and reduced current ripple whilst incorporating observer based SoC estimation. Energy management, based on SoC, is incorporated to improve battery performance, reduce variation between cells and to control charge/discharge profiles

Performance investigation of an innovative H-bridge derived multilevel inverter topology for marine applications

441-449An innovative single-phase and three-phase H-bridge derived multilevel inverter topology is being proposed in this manuscript. The proposed topology makes use of relatively fewer switching devices compared to conventional Cascaded H-Bridge (CHB) multilevel inverter. In other words, the proposed inverter topology is capable of producing more number of levels in the voltage waveform with same number of switching devices. It is also established in this paper, that this proposed topology is superior in terms of requirement of lesser number of gate driving circuits and reduction in the harmonic content in the output voltage waveform. The proposed inverter topologies are driven by SPWM modulation technique. These converter topologies are not only beneficial for the power conditioning systems in the power system network but also for the other novel applications like in marine ships. In this manuscript, the performance comparisons of the proposed inverter topologies with that of conventional topology based on simulation results with MATLAB/SIMULINK have been presented

Multi Level Inverter Under Unbalanced Voltage Conditions

A Multilevel Inverter(MLI) is a power electronic device built to synthesize a desired A.C voltage from several levels of DC voltages. Generally unbalanced voltages will occur at supply side these can be eliminated by using Multi level Inverter. In this paper a closed loop Control system is designed using PI controller in order to maintain load voltage constant for under voltage and Over voltage conditions and MATLAB simulations have been carried out

Bidirectional multilevel converter for electric vehicles

In this paper is presented an H-Bridge Multilevel Converter topology for Electric Vehicles (EVs) and Plug-in Hybrid Electric Vehicles (PHEVs). The topology of the presented multilevel converter allows the interface between the batteries, the electric motor of the vehicle, and the electrical power grid. Thereby, taking into account that the proposed multilevel converter requires the use of isolated voltage sources, the interface between the batteries and the multilevel converter is evaluated regarding the converter operation as a Battery Management System (BMS), controlling the charging and discharging processes. The interface between the multilevel converter and the electrical power grid is described considering a bidirectional operation. These modes of operation occur during the batteries charging process, denominated as Grid-to-Vehicle (G2V), and during the operation as Vehicle-to-Grid (V2G), that consists in delivering back to the electrical power grid a small amount of the energy stored in the batteries, in accordance with the electrical grid requirements and with the vehicle driver accordance. In both modes of operation, the waveform of the AC current of the electrical power grid is kept sinusoidal with unitary power factor, contributing to maintain a good level of power quality.FEDER Funds - Operational Programme for Competitiveness Factors (COMPETE)Fundação para a Ciência e a Tecnologia (FCT) - PTDC/EEA-EEL/104569/2008, MITPT/ EDAM-SMS/0030/200

A Qualitative Assessment of a Modified Multilevel Converter Topology M2LeC for Lightweight Low-cost Electric Propulsion

A Cascade H Bridge (CHB) is evaluated for both electric vehicle motor traction control and off-vehicle charging against the PowerElectronicsUK Automotive Challenge for cost and mass for the year 2035. By combining the power electronics with batteries using low-voltage MOSFET transistors in a series cascade arrangement the cost and mass targets could be met 12 years earlier (in 2023 and 20 times lighter if an application specific integrated circuit (ASIC) is used. A 200kW peak reference car was used to evaluate cost and mass benefits using four different topologies of power electronics. Vehicle installation is shown to be simplified as only passive cooling is required removing the need for liquid cooling systems and the arrangement is inherently safe; no high voltages are present when the vehicle is stationary. The inherently higher efficiency of CHB increases vehicle range. The converter with integrated batteries can also behave as an integrated on-board battery charger delivering additional off-vehicle benefits by removing the need for costly external chargers

Enhancement of performance and response time of cascaded vsc statcom in the presence of voltage variation and low power factor

The power system is an extremely non-linear system with several interconnected loads. When several loads are suddenly connected at distribution ends or when the power system is subjected to the fault, the stability of the system will be disturbed. The major problems here are the voltage sag, voltage swell and low power factor (PF). A static synchronous compensator (STATCOM) is one of the most effective flexible alternating current transmission systems (FACTS) device that can inject or absorb proper reactive power to retrieve the reliability of the grid-connected systems in presence of mentioned disturbances. STATCOM circuit comprises a control circuit, voltage source converter (VSC), and PWM technique. The STATCOM performance is mainly relying on how accurately and quickly the error signal (input of control unit) is compensated. Various controllers for STATCOM control circuit have been proposed to regulate its performance, artificial neural network (ANN)- based STATCOM control circuit is the dominant and liberal solution for enhancing STATCOM performance during the period of different disturbances. The recent researches are training ANN-based STATCOM upon tackling one or two case of disturbances, which leads to creating a weak and unreliable STATCOM during the period of other disturbances that could happen through normal daily operations, whereby the STATCOM will work in reliability if ANN trains on a different range of operating states. Also, although space vector PWM (SVPWM) that uses with STATCOM is an advanced PWM method and possibly the best among all the PWM techniques, the currently used SVPWM circuit is considered complexity since it requires the calculation of switching time and sector identification. Moreover, even-though the PWM technique and VSC are parts of the STATCOM circuit, there is a lack of investigation on the effect of VSC level and switching frequency on enhancement of performance and response time while tackling disturbances. In this thesis, a developed approach for the STATCOM circuit has been introduced. The proposed STATCOM circuit includes a modified circuit of SVPWM to reduce the implementation complexity in conventional technique, hence minimizing volumetric size, and a reliable ANN control unit able to enhance performance and response time in terms of improving voltage magnitude, power factor (PF) amplitude, and STATCOM current's total harmonic distortion (THD) in the presence of five various types of disturbances, which are voltage sag ( SLG and LL fault case), voltage swell, lagging PF load, and leading PF load. Also, this thesis presented the characteristic responses of affecting factors (VSC level and switching frequency) that enhances STATCOM performance and its response time while tackling aforementioned disturbances. The simulation outcomes showed that the developed STATCOM circuit was able to enhance voltage and PF rapidly in 0.02 sec with THD less than 5% during all disturbances. Moreover, the results of changing the factors from the point of VSC level and switching frequency have proven the possibility of enhancing response time and performance of STATCOM, whereby the response time and improvement in bus voltage increase when the STATCOM based on 5-level VSC rather than 3-level VSC. In contrast, response time decreases without enhancement in voltage when the switching frequency is raising, whereas the PF amplitude and THD value are enhanced once the VSC level and switching frequency increases

Single-phase induction motor for electric vehicle

ได้รับทุนอุดหนุนการวิจัยจากมหาวิทยาลัยเทคโนโลยีสุรนารี ปีงบประมาณ พ.ศ.255