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The purpose of this paper is to present a influences of parameter deviations on operation of a novel current sensorless AC-DC converter are discussed. The off time is calculated based on the equations of each operating state for boundary current control mode. The relationship among the THD, power factor and efficiency, and circuit parameter errors are discussed. When the circuit parameter varies from...
This paper proposes a general dwell-time equations for N-level inverter that are derived without the complex calculation. Contrary to the conventional method which has two dwell-time equations due to types, the proposed dwell-time equation is defined as one equation without the separated types. This method proceeds following step. After the voltage reference in abc-coordinate are transformed to alpha...
In this paper, the authors wanted to analyse the behaviour of fractional order system under relay control. There is a brief introduction to finding a solution for non-integer order systems both with zero and non-zero initial conditions. Then, the numerical approach is presented with some examples.
Power factor correction (PFC) converter consumes a large part of volume of power supply. Typical switching frequency of commercial PFC converter is usually not higher than several hundred kHz. Increasing the switching frequency of PFC converter to MHz by using GaN devices can greatly reduce the size and increase power density of power supply. In order to eliminate the high turn-on loss of cascode...
The recently proposed Hexverter topology belongs to the group of modular multilevel direct AC/AC converters. For its operation, a so-called adjacent compensating power is essential. This paper introduces a new method for composing the adjacent compensating power, which optimises the efficiency. The importance of the adjacent compensating power for branch energy control is shown and the differences...
Based on the so-called decoupling principle, the three-level NPC inverter can be decoupled into two three-level buck converters. With assuming balanced neutral-point voltage between the DC-link capacitors, a new discontinuous pulse width modulation (DPWM) strategy is developed in this paper. Operation principle and simulation results of the proposed modulator are presented. Experimental results from...
Applying the selective harmonic elimination (SHE) technique to grid connected cascaded modular multilevel inverters has been widely discussed in literature. However, due to the difficulties of solving high-order non-linear transcendental equations, the SHE technique cannot be implemented in real time so its applications are limited. This paper presents a technique to convert the non-linear equations...
This paper proposes average inverter model operating in two complementary modes suitable for microgrid simulation applications. Three phase voltage source inverter (VSI) connects to the microgrid through an LCL low pass filter and operates either in current controlled (CC) or voltage controlled (VC) mode. Models presented here take into account the nonlinear behavior of the switches, delays in the...
Multi-terminal High Voltage dc Transmission (MTDC) is used to reduce the power losses over two distant regions. It is difficult for typical three level inverters to reach the desired dc bus voltage levels, e.g. > 500 kV, due to the large voltage stress on each switch and switching transients. For this reason, Modular Multilevel Converters (MMC) have gained popularity in High Voltage dc Transmission...
Wide-range load variations in resonant power conversion systems can lead to loss of unity power factor at the output of a switching inverter stage, increasing the circulating reactive energy through the switches and power loss. The load-variation problem can be significantly reduced with use of dedicated circuitry that would “compress” the variation of the load resistance to a smaller range. Current...
In order to overcome the solar energy harvesting problem caused by photovoltaic (PV) panel mismatches, Distributed Maximum Power Point Tracking (DMPPT) architectures can be found in the literature. In these PV architectures, there is a DC-DC converter per PV panel, which has the function of operating the PV panel at its maximum power point (MPP). Other required specifications for the converters applied...
A new Hybrid Boosting Converter(HBC) is proposed in this paper. It combines the advantages of regulation capability of traditional inductor based DC-DC converters and gain boosting ability of switched capacitor converters. It is capable of boosting the input voltage to ten times with single active switch and one inductor while maintaining high efficiency. In addition, the switch stress is low and...
This paper presents a high performance control strategy for a single phase photovoltaic system based on cascaded multilevel converter. The concept of single phase d-q vector control is introduced into the system and a general control scheme for arbitrary number of modules is proposed. The proposed method can not only track the maximum power point at panel level but also ensures a high performance...
We consider a system of two nodes transmitting to an access point on quasi-static Rayleigh fading channels. We use signal-to-noise ratio (SNR) thresholds to characterize the requirements of each node, in terms of throughput and reliability, and we study their impact on outage probability. Given the average quality of the uplink channels, we formulate conditions on the SNR thresholds for decode-and-forward...
This paper deals with the analytical description of an interior permanent magnet synchronous motor running in six-step conduction mode. It assumes a non-sinusoidal back emf, but inductances vary sinusoidally with the rotor position. The proposed model renounces Park's transformation and delivers a set of equations which allow the numerical simulation of phase currents and torque in the abc reference...
With the development of photovoltaic (PV), fuel cells and uninterruptible power supply (UPS), high step-up converter plays an important role in them. In this paper, a single switch high step-up DC-DC converter is proposed, which can achieve high voltage gain without extreme duty cycle and huge turn ratios of coupled inductor. The leakage energy of coupled inductor can be recycled and the voltage across...
Three-level ac-dc converters are widely used in high-voltage input applications due to the reduced voltage stress on switches and extended range of dc link voltage. For three-level ac-dc converters, the asymmetry of the main circuit and drive circuit can result in voltage unbalance among the split dc link capacitors, which would cause higher voltage stress on the power switches and the output rectifying...
This paper proposes the new current reconstruction method of three-phase currents in case of using dc-link shunt resistor for three-phase AC motor. When dc-link shunt resistor is used for the acquisition of phase currents, there are the immeasurable regions in the hexagon of Space Vector Pulse Width Modulation(SVPWM). The conventional methods used the shift of the switching patterns of SVPWM to extend...
This paper presents a novel high gain two-stage inverter for Photovoltaic (PV) applications. First stage consists of very high gain Switched Inductor with Voltage Multiplier (SIVM) dc-dc converter. Construction of the second stage consists of five-switch dc-ac inverter. The proposed converter mainly designed for grid-connected PV applications. The proposed system can do the following functions: boost...
The article presents the process of designing a mathematical model of the human arm. Modelling arm consists of two joints connected by the rotational link. Each of them is represented as a rectangular prism which changes shape during the movement. The moment of shape change depends on the two-state coordinates: the angular displacement q1 and q2. Based on the analysis of the arm movement, a mathematical...
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