Active Input Current Shaping Research Articles

Reduced switching state multilevel improved power factor converter for level‐3 electric vehicle applications

In this study, an off-board multi-terminal dc charger with active input current shaping for level-3 electric vehicle (EV) charging applications is proposed. The configuration is based on reduced switching state multi-point clamped, three phase improved power factor converter and supplied by the standard ac grid. The topology has the advantage of reduced device count along with reduced maximum device stress. This will increase the speed of EV charging and enables the reduction of capital and maintenance costs of the charging facilities, enhancing further expansion of the eco-friendly transport. In addition, one of the key performance indicator, i.e. the fault ride-through capability, is investigated in the proposed topology under various unbalanced input conditions. Further, steady-state and transient performance of topology during load, as well as, dc-link voltage change is presented. Minimum distorted and balanced line currents are drawn from supply by implementing negative sequence elimination control algorithm. The validation of the proposed topology is verified with simulation and a down-scaled experimental setup.

Active input current shaping with new MPC structured TP-TL-5L converter with reduced PSD count for renewable energy conversion

In this paper, a new multi-point clamped (MPC), three phase two leg, five level front end high power factor converter (TP-TL-5LHPFC) for direct connected wind energy conversion system with permanent magnet synchronous generator (PMSG) is proposed. The converter can be modeled and modulated similar to other existing MPC structured converters with omission of clamping diodes and bi directional switches. The proposed converter has an advantage of reduced power semi conductor device (PSD) count along with reduced maximum device stress. The concept can be extended to increase the converter voltage levels by adding extra half bridges at the top and bottom of the converter. A factor (normalized index) is introduced and comprehensive comparative analysis with N level existing topologies is carried out. The minimum value of normalized index makes the proposed topology is suitable option for medium voltage and high power applications. In addition, the fault ride through capability is one of the key performance indicator for large motor drive systems is investigated on proposed topology under various unbalanced input conditions i.e. voltage sag and line to ground fault. Further, steady state and transient performance of topology during load as well as dc link voltage variation is presented. Minimum distorted and balanced line currents with nearly unity power factor (UPF) are drawn from supply by implementing negative sequence elimination control algorithm. The validation of proposed topology is verified with simulation and a down scaled experimental setup.

Six-switch converter fed sensorless three-phase IM drive for home appliances

Abstract In this paper, a single-phase to three-phase converter is proposed to provide variable output voltage and frequency. The proposed topology employs only six IGBT switches, which form the front-end rectifier and the output inverter for the one step conversion from single-phase supply to output three-phase supply. The front-end rectifier permits bidirectional power flow and provides excellent regulation against fluctuations in source voltage. Moreover, it incorporates active input current shaping feature. An easy method to implement control strategy is proposed. This control strategy ensures nearly unity input power factor with sinusoidal input current over the operating range. Based on sensorless vector control technique, the proposed converter is used for the speed control of the three-phase induction motor. A low cost motor drive can be achieved using the proposed converter and control technique. Simulation and experimental results are carried out to analyse and explore the characteristics of the low cost drive system.

Single-to-three phase induction motor sensorless drive system

This paper presented a single to three-phase induction motor drive system to provide variable output voltage and frequency. The proposed drive system employs only six IGBT switches, which form the front-end rectifier and the output inverter for the one step conversion from single-phase supply to output three-phase supply. The front-end rectifier permits bidirectional power flow and provides excellent regulation against fluctuations in source voltage. Moreover, it incorporates active input current shaping feature. The control strategy of the proposed drive system of three-phase induction motor is based on speed sensorless vector control technique. A low cost of motor drive and much more advantages can be achieved using the proposed drive system. Simulation and experimental results are carried out to analysis and explore the characteristics of the proposed drive system.

A Different Approach to Implement an Active Input Current Shaper

In recent years, several AC/DC converters have been presented in order to meet the power quality regulations, while maintaining the lowest number of components with the purpose of minimizing the cost and complexity; for this purpose the active input current shaping technique was proposed. A new active input current shaper (AICS) is presented. Differently from the traditional series AICS, the proposed scheme connects the auxiliary output of the main converter in parallel with the rectified AC mains instead of the series connection. The proposed parallel scheme demands a current with a low harmonic content where the standard specifications are fulfilled. The operation, simulation, and experimental results of the proposed scheme are presented.

Microwave heating power supply operating in a high power-factor mode

The performance of a switched-mode magnetron power supply is considered in which a rectified, non-filtered mains voltage is applied to the converter input. The system features output voltage boosting at the input voltage zero crossings, and provides high power-factor operation. A closed-form expression for the system gain is obtained with and without active input current shaping. The analytical results show that the system tends to linearize the inherently nonlinear magnetron characteristic, and that a complete linearization could be achieved by frequency modulation within the mains period. The optimum converter component values are identified and the results are verified experimentally.

Economic single-phase to three-phase converter topologies for fixed and variable frequency output

Several component-minimized circuit topologies for single-phase to three-phase conversion are proposed. The topologies employ fewer semiconductor devices and generate high-quality output voltages. Suitable modification to achieve active input current shaping is illustrated in detail. Analysis and simulation of the proposed schemes are carried out to show the high-performance features. Suitable guidelines for the selection of filter components and for facilitating circuit design are presented. Selected results are verified experimentally on laboratory prototype converters. >

A new single-phase to three-phase converter with active input current shaping for low cost AC motor drives

A single-phase-to-three-phase converter for a low-cost AC motor drive is proposed. The converter employs only six switches and incorporates a front-end half-bridge active rectifier structure that provides the DC link with an active input current shaping feature, which results in sinusoidal input current at close to unity power factor. The front-end rectifier in the converter permits bidirectional power flow and provides for excellent regulation against fluctuations in source voltage, facilitating regenerative braking of the AC motor drive. A control strategy that maintains a near-unity power factor over the full operating range and is easy to implement is described. Suitable design guides for the selection of filter components are presented. Simulation and experimental results that verify the developed theoretical models are also presented. >