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In this paper, a new control method for capacitive link universal power converters is proposed to eliminate the need for measuring the output and input voltages. Capacitive link universal converters are a new class of power converters that offer high power density and reliability, and are capable of transferring power between any type of source and load, dc or ac, with any number of phases, emerges...
Due to the structural design of the traditional matrix converter, the voltage transfer ratio is limited to 0.866. In this paper, we purposed a new one-step boost type matrix converter, which can change the voltage transfer ratio variable from the perspective of changing the topological structure. The topological structure of one-step boost type matrix converter not only improved the voltage transfer...
According to the traditional control of three-phase inverter, basing on the transient mathematical model of second order of virtual synchronous generator, the three loops control of power-voltage-current with virtual synchronous generator (VSG) by using the feedback of capacitance's voltage and current was built. And the proportional and integral control was applied in the loop of voltage to ensure...
Induction motor (IM) is the workhorse of the industries. Amongst various speed control schemes for IM, variable-voltage variable-frequency (VVVF) is popularly used. Inverters are broadly used to produce variable/controlled frequency and variable/controlled output voltage for various applications like ac machine drives, switched mode power supply (SMPS), uninterruptible power supplies (UPS), etc. This...
The analysis of electromagnetic processes in an electric circuit with the semiconductor converter is presented in the paper. The mathematical model for the analysis of electromagnetic processes in the semiconductor converter with power width regulation of the output voltage has been created. The problem of using the method of multiple parameter modulating function has been solved in the research work.
In order to solve the problems about frequency fluctuation, power allocation between AC and DC sub-microgrid, and operation switching between island and grid-connection mode, a synthetically operation control strategy of hybrid AC/DC microgrid is presented in this paper. As the main converter in AC sub-microgrid, the control strategy of the storage converter adopts the voltage control type virtual...
This paper attempts to present the devising of the Matrix converter and an AC-DC-AC converter along with their working principle and control mechanisms. Both of these converters are AC-AC converters and are primarily used in cases where frequency of the out-put AC signal needs to be regulated with respect to the input. The principle of superposition is used by the matrix converter and is deployed...
This paper introduces a efficient design a the grid side inverter for railway applications in cascaded multilevel hybrid technology. It is shown how to balance the capacitor voltages and how to dimension the capacitor size for different control strategies. Additionally the calculated power losses for this topology are determined and compared with two-level converter.
In order to reduce output voltage harmonics and improve efficiency, a symmetrical hybrid nine-level inverter for high speed open-winding motor drive system is presented in this paper. Each phase of this inverter is composed of a five-level DC/DC converter and an H-bridge. The DC/DC converter is operated at high frequency with low voltage MOSFETs and the H-bridge is operated at fundamental frequency...
This paper introduces a modified single-stage power factor correction (S2PFC) converter topology for high voltage, power and frequency (HVPF) applications which improves the power quality at utility AC side and at the load end. The modified proposed converter possess the ability of controlling the voltage and frequency independently and also simultaneously. The voltage can be controlled by PWM technique...
This paper presents the modelling and control strategy for a new high-power multilevel multipulse medium frequency-isolated dc-dc converter. The new converter is composed by a Modular Multilevel Converter (MMC) associated to an isolated Multipulse Rectifier (MR). Its application is targeted to non-conventional distribution and sub-transmission systems, while operating at tens of kVs and a few MWs...
A novel family of forward mode three-level direct ac converters is proposed. The converters can transfer unsteady high ac voltage with distortion into regulated sinusoidal voltage with low THD at the same frequency. The circuit configuration is constituted of three-level converter, high frequency transformer, cycloconverter, input and output filters. The topological family includes forward, push-pull,...
This paper describes the control algorithms for electric drive with single phase matrix converters supplied medium frequency converter for traction purpose. Described control algorithms realize the control of active and reactive power, output voltage, reduce harmonic disturbance in input current and oscillation of voltage on input filter etc. These control algorithms were implemented into multiprocessor...
This paper describes the switching algorithms for single phase matrix converter (switching logic for matrix converter). There is shown two basic methods of the control of the switches in the matrix converter and these modifications (and combining algorithm). First method needs the knowledge of the polarity of the output current of the converter and the second method needs the knowledge of the polarity...
Application of single-cycle control of the inverter can enhance the inverter DC input immunity. Controling auxiliary voltage and current outer loop in a single cycle, the load capacity of a single-cycle control can be improved. In this paper, for single-phase voltage-type high frequency link matrix inverter, we study a new multi-loop SPWM control strategy based on single-cycle inner control. Simulation...
This paper presents a hybrid modulation method to limit the neutral point (NP) voltage ripple and reduce the requirement for dc link capacitors during the startup process for three level motor drive systems. The neutral point voltage calculation model is presented to study the large NP voltage ripple for three level modulation during the startup process. Moreover, the possible overvoltage issue on...
This paper proposes a novel strategy to obtain stable sinusoidal voltage using an AC-AC converter with high frequency AC link. The converter can regulate an unstable sinusoidal voltage to a stable sinusoidal voltage with very less harmonic distortions. The circuit uses a full bridge cycloconverter on either sides of a high frequency transformer. The use of high frequency link in this converter can...
Flying capacitor multicell (FCM) converter is one of the well-known breeds of multilevel converters. There are several configurations of flying-capacitor-based converters presented and reviewed in the literature. One of the promising topologies of the FCM converter suitable for single/threephase applications requiring isolated converters is H-Bridge (Full-Bridge) FCM converter wherein two FCM converters...
This paper presents practical design aspects of a high-power DC-DC converter which is applicable to renewable sources for dc grid. The output voltage of a dc-dc resonant converter can be varied by adjusting the switching frequency. In order to maintain output voltage constant from full load to no load using conventional frequency control, the range of switching frequency variation is very high. This...
Control, design and operational characteristics of multilevel modular matrix converter (MMxC), which conducts ac/ac direct frequency conversion, are presented in this paper. MMxC consists of a large number of H-bridge cells connected in series and thus is suitable for high voltage and high power applications. After brief explanation about power flow and capacitor voltage balancing control schemes,...
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