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Transformerless PV inverters are known to generate undesirable ground leakage currents due to the lack of galvanic isolation between the PV array and the electric grid. This paper initially discusses the different types of transformerless PV inverter topologies that have been proposed to overcome this problem. It then proposes a new topology, which extends the commercially successful HERIC inverter...
In this paper, we propose a comprehensive co-simulation platform for the clusters of microgrids. Our proposed real-time platform considers both physical and communication layers, which can be simulated via real-time digital power system simulator (RTDS) and OMNeT++. We also propose a novel oblivious power routing scheme to prevent congestion and minimize network loss. To this end, we firstly introduce...
Considering the effect of current and voltage frequency content in the power-hardware-in-loop (PHIL) simulation of water electrolyzers is studied as the AC components may cause additional losses in the electrolyzer stack. A transistor based power supply is used to excite DC current with selected AC components for an alkaline electrolyzer and a PHIL simulator. The practical current and voltage waveforms...
This paper proposes a high response voltage phase torque control method of interior permanent magnet synchronous motors for both linear and over-modulation range including six-step mode. In our proposed method, a new n-t coordinate system is utilized, on which voltage phase and amplitude are controlled responsively and stably.
The Current-Direction Detection based on measurement of the load current can be used as static MOS-Control of the BIGT. As the gate-emitter voltage vge affects the ON-state characteristics of the BIGT in diode forward-conduction mode, it has to be adapted for optimised operation. In order to operate at low static losses vge has to be below threshold voltage in diode forward-conduction mode. The chosen...
The objectives of this article were to design a low-cost three-phase AC voltage measurement circuit and new Android smartphone application to monitor the measuring voltage from a safe distance. The smart distance power electronic measurement (SDPEM) system was designed based on an Arduino UNO R3 board used as a microcontroller to read and calculate the RMS values from a three-phase AC voltage measurement...
The AC/AC single-phase/single-phase Modular Multilevel Converter (MMC) presents very interesting features for the realization of a Medium Frequency Power Electronic Transformer for traction applications, in AC-fed or multisystem railway rolling stock, like locomotives, Electric Multiple Units (EMU), high-speed units, and so on. Aiming to maximize the output frequency of the converter, i.e. the operating...
This paper introduces the optimal design of a output filter for a Single-Phase Grid-Tied Inverter considering Continuous and Discontinuous Conduction Modes (CCM and DCM). An optimal design procedure has been proposed, which enables to consider different technologies on the inductor design. Technologies on magnetic materials and wire types has been considered and their benefits for CCM and DCM solutions...
There are today many techniques for controlling active filters on single-phase networks in order to correct the power factor and limit the harmonics consumed at the source. Almost all of these methods are determined for a perfect sinusoidal source. The work developed here concerns the taking into account of a perturbed network, that is to say the presence of voltage harmonics at the connection point...
This paper presents two predictive control methods with reduced number of calculations for five-level AC/DC rectifier. The first method is the simpler and required to calculate the value of cost function for only three converter voltage vectors. The second method is using two steps prediction horizon and required to calculate cost function for seven vectors in first step and for three vectors for...
The article presents results of parametric identification of mechanical part of drive system with permanent magnet synchronous motor by means of heuristic method of Particle Swarm Optimization (PSO). The assumed mechanical part has a complex structure, consisting of two-mass connected by an elastic joint with backlash. The optimization process was designed to find model parameters that assure the...
The output torque of switched reluctance motor (SRM) can be controlled by flowing an appropriate current through the armature windings. In general, current hysteresis control has been applied. However, there is a problem that acoustic noise generated from the SRM at the driving tends to become large. Then, there are reports that PWM control has been applied to suppress the acoustic noise. This paper...
Electric models of battery have to take into account the effect of temperature for the state-of-charge estimation. As a matter of fact, at low temperature the driving range of the vehicle can be overestimated up to more than 20% with electric only models. We propose to couple thermal and electric battery models for improving the range estimation.
A MIMO1 current-control approach for 3-phase grid connected inverter systems in the abc-frame is proposed. Redundant states are eliminated and the system is controlled via an explicit MPC2-approach. To achieve steady-state accuracy, the system-model is augmented by a simplified grid-model to obtain a high dynamic control structure, which supersedes the use of resonant controllers and coordinate transformations...
DC circuit breakers are needed in future HVDC grids to provide selectivity in clearing DC faults and to achieve continuous operation of the healthy part of the grid. Standard mechanical circuit breakers as used in AC systems cannot be used in HVDC applications due to the lack of current zero-crossing, which is essential for arc extinction. To use mechanical interrupters for fault current interruption...
Wide Band Gap (WBG) transistors using materials such as Gallium Nitride (GaN) and Silicon Carbide (SiC) offer superior electrical and thermal properties, as well as fast switching capability. However, the high dv/dt and high di/dt may cause ringing with the parasitic inductances and capacitances in the switching loop, increasing overshoot voltages and reducing confidence in the design. Also, making...
There is a method for charging a battery of electric vehicles by using bi-directional inductive power transfer (IPT). A system applied with IPT is convenient, safe and maintainable. In previous studies, various control schemes for a bi-directional IPT system have been proposed. However, these control schemes are not practical because the resonant circuit controlled with the control scheme is not optimized...
The use of LC and LCL filters and grid impedance variations are creating new challenges on the controller design for current control loops of photovoltaic and wind turbine inverters. In the design process, stability criteria such as Bode and revised Bode are commonly used. This paper analyses the limitations of Bode and revised Bode criteria to reliably determine stability and proposes a sufficient...
This paper proposes a single-switch circuit derived from buck boost converter which converts input DC voltage into desirable AC and DC voltages. The switching strategy used is sinusoidal pulse width modulation with a DC offset-known as augmented sinusoidal pulse width modulation (ASPWM). The ASPWM waveform is obtained by sine triangle comparison method where the modulating signal is the combination...
This paper presents the use of innovative high-voltage SiC diode technology in the development of a user configurable full-wave or half-wave rectifier bridge. The devices are of merged Junction-Barrier-Schottky (JBS) type to enable for optimum performance even in the presence of current surges, as demanded by the application. To contain the cost of the proposed solution, their packaging relies on...
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