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In this paper a novel Multi-Input-Single-Output (MISO) Boost Converter topology for renewable energy systems is proposed and presented. This proposed topology will be used to obtain different output voltage levels from several power sources, such as wind turbines, photovoltaic arrays, fuel cells, etc. Multi-Input-Single-output converters provide flexibility in terms of the choice and the availability...
In this time, Multilevel Inverter (MLI) innovations turn into an unimaginably primary decision in high power medium voltage energy control range. Despite the fact that multilevel inverter has various advantages but since of utilizing more number of semiconductor switches, it has disadvantages in the vein of high level, extensive size and high cost. To defeat this issue another multilevel inverter...
In this paper a Marx generator principle has been used to generate a 1.6 kV pulse at the output. Two groups of capacitors with anti-parallel charging is employed [6]. In order to reduce the switching and conduction losses resonance phenomenon has been used to trigger the switches. Insulated Gate Bipolar Transistor (IGBT) switches are employed to connect the charged capacitors in series to supply the...
A new bidirectional multilevel converter topology called Hybrid Multilevel Converter (HMC) suitable for high power AC/AC applications is presented. It is based on cascaded connection of multiple half-bridge submodules in addition to nine thyristor-based low-frequency and soft-switched unfolders in a three-phase version. Compared with a conventional modular multilevel converter (MMC), HMC requires...
This paper presents a new converter topology for voltage source converter based high voltage dc application, named modular embedded multilevel converter (MEMC). MEMC is based on a three level structure and consists of series-connected IGBT bridge stacks, like the popular modular multilevel converter (MMC) and series-connected thyristor stacks. The IGBT bridge stacks are leveraged to generate the output...
Advancements in power-electronic devices as well as the transition to new electrical power sources make the application of multiterminal medium voltage DC grids feasible. In order to selectively interrupt fault currents, DC circuitbreakers might be required for a safe grid operation. Since different DC breaking concepts for low, medium and highvoltage are available, this paper compares several concepts...
Modular multilevel converter (MMC) is one of the promising voltage source converter topologies in the field of high voltage direct current (HVDC) transmission system. Based on analysis of the existing sub-module topologies, an improved half-bridge sub-module topology based on reverse blocking IGBTs (RB-HBSM) was proposed for solving the fault ride through issues. In this paper, the fault current blocking...
In this work it is presented a review of the Multilevel Current Source Rectifiers (MCSR), aiming to reduce the number of switches and inductors, thus reducing losses, cost and volume of the converter. Despite the removal of switches and inductors, the control and PWM ensures the correct operating of the converter. Simulations are presented to validate the effective operation of the topology for five-,...
Modular Multilevel Converters (MMC) can provide significant advantages for power transmission applications, however there are remaining challenges trading off DC fault response, losses and controllability. Alternative multilevel converter topologies using combinations of full bridge and half bridge submodules or series switches allow for competitive efficiency whilst retaining control over the DC...
Self-blocking MMC (SB MMC) is able to isolate DC fault current and is promising for use in overhead HVDC transmission. Each converter arm of a SB MMC is consisted of half the self-blocking sub-module (SBSM) and half the half bridge (HB) sub-module. This hybrid design achieves the DC fault isolation capability without significantly increase of the cost and power loss. The detailed electro-magnetic...
Stangenes Industries has developed a solid-state inductor-driven kicker magnet pulse generator for use in a particle accelerator application. The system operates in a neutron environment which precludes the use of standard capacitor-driven systems. A 500–700 A pulse is produced by switching high-current through a large 360 μH inductor from the circuit return into a 6.5 μH kicker magnet. The DC magnetic...
An IGBT switch together with a blocking diode is normally used for the primary switch in a magnetic pulse compression circuit. In the presented paper a full bridge configuration as a primary switch is proposed. The configuration shows advantages especially for high repetition rate systems. It shows also higher efficacies because no special network is necessary for the reflected energy. The system...
Battery energy storage system(BESS) connected to the grid by power conversion system(PCS). Currently Cascaded Multilevel Converter(CMC) and Modular Multilevel Converter (MMC) are two more advanced topologies for PCS. This paper compares CMC and MMC topologies in aspects of efficiency, harmonic characteristics, reliability, control system complexity and cost, the simulation results are presented. Suggestions...
Among the various multilevel converter topologies used in medium and high voltage grid applications, the Modular Multilevel Converter (MMC) has been the most promising since it combines good harmonic performance with low switching frequency and high reliability. A major concern however for inverter designers has been the associated cost due to the need for a large number of power devices and capacitors...
In this paper, a novel twenty-one level inverter unit is proposed. Using this, the cascaded multilevel inverter topology is suggested to achieve the higher number of output levels. The cascaded topology is constructed by the series connection of the twenty-one level basic unit. The topology is created in such a way that more levels can be added without modifying the existing circuit. The proposed...
The Modular Multilevel Converter (MMC) topology has become one of the most promising solution in HVDC applications when compared with similar approaches. The evaluation of the power losses in an MMC terminal is fundamental to estimate the overall converter efficiency and size the required thermal management system. In this paper, a complete comparison of two methods to calculate conduction and switching...
Recently a new zero-current switching full-bridge isolated DC/DC converter has been presented in literature. A semi-resonant L-C cell without any additional switch allows to achieve the soft-switching conditions. The main benefits of the proposed architecture, which are the zero current switching at both primary and secondary side and the very good exploitation of the HF-transformer, were up to now...
Modular Converters such as the MMC have become the new standard in VSC-HVDC applications. Their modularity has brought many industrial advantages but also increased the complexity of their operation. This paper looks at how a range of techniques may alter the balance of power losses between the IGBT modules. These techniques are based on circulating currents at the (i) fundamental frequency and (ii)...
Impulse generators were used to generate high voltage pulses. Marx generator is a multistage impulse generator. Conventional Marx generator used spark gap switches. In recent years these switches are replaced with semiconductor switches. The bipolar Marx generator is able to produce positive, negative and bipolar pulses. This paper deals with design and implementation of 2 stage solid state Bipolar...
This paper presents a novel generalized topology of a multilevel inverter. The proposed topology is obtained by extending the developed H-bridge topology. The proposed topology is competent to generate the optimum number of output voltage levels by using minimum number of dc voltage sources. The topology offers reduced value of voltage stress on semiconductor power switches. Utilization of dc voltage...
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