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A conventional medium-voltage large-capacity bidirectional chopper used in a battery energy storage system for dc electric railways is equipped with a heavy and bulky inductor for current smoothing. This paper presents a bidirectional chopper for the purpose of reducing the size and volume of an inductor, which is characterized by using an auxiliary converter in addition to the main converter. The...
The paper describes a laboratory board made by the authors to study the power electronic converters whose topology is a simple half bridge structure with power transistors and recovery diodes. The board is conceived to be easily integrated in a reconfigurable laboratory setup and includes a half bridge IGBT module, a double MOS gate driver and a PWM modulator achieved with a microcontroller. Using...
With commercial operation of the first Chinese Maglev line, lifetime prediction of power devices in Maglev choppers becomes a crucial topic. This paper adopts a mission profile of one typical Maglev chopper for lifetime prediction. A test rig is built for the IGBT/Diode case temperature measurement. Using look-up tables of IGBT/Diode losses, an accurate electro-thermal model can be established. The...
This paper proposes a new commutation approach for direct converters with bidirectional switches based on UCE-measurement and verifies the applicability with a commutation scheme for V-connection AC choppers. The practicability is proven experimentally and the current and voltage quality of the one-step commutation is compared with the two-step commutation approach.
Induction heating can convert electrical energy to thermal energy with high conversion efficiency and quick heating. Currently, a current source rectifier/inverter-fed parallel resonant circuit is widely used as an induction heating power supply for forging applications. However, the conventional induction heating power supplies composed of phase-controlled rectifier and SCR inverter have low efficiency...
An effective power control strategy of intermittent wind/PV generations in an isolated Microgrid is proposed to address frequency and voltage requirements. The studied Microgrid is a 33-bus system supplied by small PV unit and squirrel cage induction generator (SCIG)-based wind energy conversion system (WECS). Due to its fast response, high efficiency and long lifetime in comparison to other alternatives...
This paper presents an optimal design of dynamic wireless automatic charging system for roadway-powered electric vehicles (RPEVs), which can effectively improve the charging performance of wireless electric vehicles. For automatic charging, the optimization of industrial automation systems on the application of RPEVs can fundamentally solve a series of problems, especially for the central issue of...
Super conducting magnetic energy storage (SMES) may improve the Frequency stability of a system, because of its fast response time in charging and discharging energy. This paper proposed the modelling and control of a hybrid solar photo voltaic, wind energy, Diesel-Engine Generator (DEG) and Superconducting Magnetic Energy Storage systems connected to an isolated power system. Due to random variations...
Standard Voltage Source Inverters (VSI) operates with a DC voltage source greater than the peak voltage of the AC source and Current Source Inverters (CSI) with a DC voltage source lower than the peak voltage of the AC source. This paper shows how several topologies of reversible AC/DC buck-boost inverters which do not suffer from such constraints can be compared on the basis of semiconductor and...
Energy diverting converter topologies are important power electronic components for HVDC connected offshore wind parks to meet grid code requirements. In this paper, three different types of energy diverting converter topologies are investigated. In the first section, the topologies are introduced and compared under general aspects. Afterwards, an approach for a sinusoidal voltage modulation of a...
Synthetic Test Circuit (STC) system for thyristor valve of current-type High Voltage Direct Current (HVDC) typically consists of a low-voltage high-current and a high-voltage low-current source. In order to provide the isolation between each source, auxiliary valve should be inserted, and its voltage and current ratings are greater or equal to those of the test thyristor valve. To ensure the turnoff...
This paper presents a pseudo-cascade controlled IGBT chopper used for transient protection of the DC-link and battery of Electric Vehicles (EVs) with regenerative braking feature. During EVs traction and braking operation, the DC-link shows transient behavior that can seriously damage the main battery and the filtering capacitors. The proposed system is used to protect the battery against surge line...
With the advent of semiconductors manufacturing technology, current and voltage ratings of Insulated Gate Bipolar Transistor (IGBT) modules have been increased. Because of the faster switching capability, thyristors are being supplanted by the IGBTs. This new generation of IGBT modules are being increasingly used in applications such as AC/DC choppers to produce large controlled currents. Typical...
Reliability of power electronic systems is of paramount importance in industrial, commercial, aerospace, and military applications. Faults in power converters are classified as short circuit faults, open circuit faults, and degradation faults. Short circuits (S-C) in most cases cause an overcurrent condition that is readily detected and acted upon by standard protection systems. However, open circuit...
In recent years many different modulation techniques have been introduced in order to support the growing number of multilevel converter topologies. These techniques have own disadvantages and some limitations. This paper presents a new optimized variable offset modulation technique for differential multilevel converters. The proposed modulation technique with achievement to full DC utilization reduces...
Dead-time is introduced between the gating signals to the top and bottom switches in a voltage source inverter (VSI) leg, to prevent shoot through fault due to the finite turn-off times of IGBTs. The dead-time results in a delay when the incoming device is an IGBT, resulting in error voltage pulses in the inverter output voltage. This paper presents the design, fabrication and testing of an advanced...
Series motors and common four quadrant H-Bridge dc choppers are widely used for dc drives of electric vehicle, but details of their design and operation can hardly be found in the literature. This paper describes the operation of a new four quadrant dc chopper that can be used for electric vehicle traction. The chopper has several modes of operation such as driving, field weakening, generating, regenerative...
The characteristic study on the buck-boost and Cuk chopper circuit has an important role for optimal design of the DC-DC converter. Therefore, based on the given parameter conditions, the two chopper circuit models are constructed using software simulation integrated environment — Simulink of MATLAB, and the circuit characteristics are discussed, such as the output voltage, the circuit current and...
This paper describes evaluation of IGBT partial turn-off behavior by 3 types of circuit topologies, hard switching (SW) type, Zero Voltage Switching (ZVS) type and Tail Loss Cancel (TLC) method. Partial turn-off method by ZVS without over elimination in proposed Snubber Assisted Zero voltage and Zero current transition (SAZZ) topology obtained highest efficiency of 97.42 % at 30 kW, 1.82 % higher...
AC Voltage Controllers are finding important application in speed control of induction motors, light dimmers, heat controllers and soft starters. AC Chopper is an arrangement of bi-directional switches to control the output voltage by varying the duty-cycle of operation of the switches involved. In this paper, a new switching scheme for three phase ac chopper is discussed which requires only three...
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