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This paper studies an isolated multiple input single output DC to DC converter for energy diversification. MISO DC-DC converter interfaces multiple different renewable energy sources. The power conversion is usually achieved by proper configuration of the circuit components and proper operation of switches. This topology is based on several assumptions and restrictions which helps to minimize the...
Defibrillators are electronic sanitary apparatus, used for urgent surgery for restoration cardiac activity. Defibrillator is fast, effective and easy a method surgery and therefore are still more used. Practical education of engineers in this topic is limited, in particular to the potential risk of unwanted defibrillation pulse during operation of the device. Therefore, we designed and implemented...
This paper proposes the modeling and control of a Solid-State Transformer built using a three stage conversion topology. First, a rectification stage is used, where a three-phase high-voltage AC signal is converted to a DC level; this stage is then followed by a DC-DC converter, and finally an inverter is used to convert the DC into a three-phase low-voltage AC signal. The adopted topology is modeled...
Models of the modular multilevel voltage inverter (MMI) were developed. A quantity of series half-bridge transistor cells with capacitors in each arm is arbitrary. Modeling was implemented in MatLab and in the environment of in-house design ComSim. In ComSim the model was developed by the methodology of system modeling by interconnected subsystems, which allowed small machine time losses for calculations.
This paper describes a regenerative snubber, based on an auxiliary buck converter (ABC), working in boundary conduction mode (BCM). The energy, from the leakage inductances of the main transformer in a converter, is stored to the clamp capacitor, and then transfered to the load, by the proposed snubber circuit, which is based on an ABC. The use of BCM in the snubber allows for control of the power...
This document establishes the theory and the guidelines for a MMC-HVDC (High Voltage Direct Current Modular Multilevel Converter) modelling and control algorithm. Using a defined mathematical model, the control of a MMC-HVDC is implemented in a simulation software (MATLAB).
In this paper a piezoelectric sensor able to measure vibrational energy, to store energy and to transmit data has been presented. The possibility to take advantage of external and not deterministic vibrations is of great interest in the modern research. Vibration energy can be exploited to supply sensors, to transmit data or to measure kinetic energy. The device presented in this paper is able to...
A novel flying-capacitor-clamped five-level inverter based on bridge modular switched-capacitor topology is proposed in this paper. The inverter features the switched-capacitor circuit with dc–dc boosting conversion ability and the multilevel inverter circuit with flying-capacitor-clamped performance. With the special composite structure, the number of components is cut down compared to the topology...
This paper presents the design and implementation of a power supply unit for zone-less induction cook-top. Here a control algorithm is also presented for tracking the user activity which includes misalignment of pan above the coil and removal of pan. The control algorithm is implemented using a DSP processor. The power supply consists of a power stage, control stage, and digital control algorithm...
This paper presents a Phase Shifted Carrier Modulation technique for Modular Multilevel Inverter (MMI). MMI is composed of a number of half bridge units and each unit consists of a floating dc capacitor. Voltage balancing of these floating capacitors is an important issue in MMI. Reverse Polarity (RP) and Bypass Bridge (BB) are the two schemes introduced for capacitor voltage balancing. Both the schemes...
Commonly used 3-leg inverter interfaces in a microgrid are not capable of maintaining balanced and sinusoidal voltage at their terminals with unbalanced and nonlinear loads. Additional compensating circuits are required to take care of such loads. Simulation and experimental results of 4-leg inverter with nonlinear and unbalanced load justify its use from power quality improvement point of view in...
Multilevel inverter (MLI) is a proven technology used for control of electrical machines, grid integration of renewables and active power filtering. The recent trends show ingenious attempts to achieve maximum number of output voltage levels with minimum number of active device count and active device rating. This paper proposes a novel family of H Bridge MLI with transistor clamp to increase number...
Active ripple current reduction method is proposed for isolated DC/AC dual active bridge (DAB) converter to reduce the double grid frequency ripple in the DC current. Unlike those active methods that require extra switches to construct separate ripple reduction circuit, in this method, one or two branches of LC ripple steering circuits are used along with existing full bridge switches in a multiplexing...
Multi-port dc-ac and dc-dc converters are of great interest for applications where electricity is generated through a variety of energy sources and where energy storage systems are required. In this paper, a three-port, dc-dc-ac Solid State Transformer (SST) is presented that can control the magnitude and direction of power transfer between a battery, a dc bus and the ac grid. The proposed SST features...
This paper presents a two phases inverter fed from a single-phase supply, using only two power semi-conductors switches. The first phase is a single phase supply and the second phase shifted out the first one by 90° using the static power conditioner. The static power conditioner consists of a diode bridge and two power switches for half-bridge inverter with two capacitors in the DC link. The change...
A frequency modulation scheme is proposed for a Capacitor-Inductor-Inductor-Capacitor (CLLC) Resonant Dual Active Bridge (RDAB) that relies on dynamic retuning of the resonant capacitors to the switching frequency as it is modulated. The proposed modulation scheme greatly reduces the circulating reactive currents in the High Frequency Link (HFL) by operating at a range of fixed discrete switching...
The design of the LLC resonant converter is presented for use in electrical discharge machine (EDM) applications. This converter is designed to operate with a dc input voltage and will output controlled dc voltages during both the striking and arc conditions of the EDM process. The method employed magnitude and frequency control to enable the converter to operate at zero voltage and zero current transitions...
The Modular Multilevel Converter (MMC) has many features that make it suitable for photovoltaic systems. It has good output performance, flexibility in control and its modular and scalable design allow it to directly connect to high voltage networks. The converter's isolated DC links also allow for the connection of many individual PV arrays. This paper presents an MMC control scheme which, by controlling...
The superior harmonic performance of the modular multilevel converter facilitates reduction in passive filtering requirements. However, in practice, any volume and weight reduction brought about by using smaller filtering components, is offset by the increase in stored capacitor energy inside the converter. This paper proposes injection of high-frequency circulating currents and zero-sequence voltages,...
In many practical applications of wireless power transfer (WPT) system, high power transmission efficiency is required and has been widely studied as an important issue. This paper presents and analyzes a Series-Parallel compensated WPT system with a Z-source inverter network inserted. To obtain higher efficiency, asymmetrical voltage-cancellation (AVC) control is applied and the ZVS operation is...
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