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Power Electronic Transformer(PET) is a promising component in the future power system. The PET can offer not only the functions of conventional low frequency transformer, but also many additional functions. Among all the additional functions, the reactive power control function is considered one of the most important one. This paper is discussing the application of reactive power control function...
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...
Traction drives frequently operate at large torque and low speed states, which results in large junction temperature fluctuations and high peak value of inverter power devices. Therefore, the reliability of IGBTs will decrease significantly without suitable thermal control. In order to reduce power losses and junction temperature in low speed operation, the main studies of this paper are as follows:...
Battery modelling is a significant component of advanced Battery Management Systems (BMSs). The full electrochemical model of a battery can represent high precision battery behavior during its operation. However, the high computational requirement to solve the coupled nonlinear partial differential equations (PDEs) that define these models limits their applicability in an online BMS, especially for...
A software requirement standards by IEC is now in draft stage. The publication has already been nubered as IEC 60183-4 which regulates software analysing digitally measured a.c. and d.c. data. TDG (Test Data Generator) like IEC 61083-2 comes with IEC 61083-4. A software used in accreditation laboratory or higher class has to process TDG data within reference values specified in the IEC standards....
In order to improve the reliability and the stability of DC microgrids (MG) and performance of DC bus voltage regulator, at the same time, a new concept of DC bus control signal (DBCS) algorithm based on pulse frequency variation is proposed. In conventional power management algorithms such as centralized control, power line signaling (PLS), and DC bus signaling (DBS), the reliability of DC MGs could...
The Fundamental PWM Excitation (FPE) is a recent sensorless motor control method in the electrical drive system which uses the current derivative measurement to estimate the rotor position. However, parasitic effects arising from the IGBT switches cause high frequency oscillation in current, so the current derivative estimation cannot be made until these high frequency oscillations die down. In this...
This paper proposed a novel topology to increase the efficiency of the power amplifier applied in the microwave wireless power transmission system. The proposed topology consists of a Class Φ2 inverter in parallel with a voltage-controlled Class AB liner amplifier. The proposed topology achieves both high efficiency and high linearity, and it has the advantages of low voltage stress, small volume...
The power transfer efficiency and coil offset degree are two key indicators in wireless charging system of electric vehicles. In order to achieve the maximum offset degree under the premise of meeting a certain transfer efficiency, an optimal design method of resonator is proposed based on real value genetic algorithm (GA). According to the Biot-Savart theorem, an algebraic mutual inductance expression...
This paper proposes an online dynamic electro-thermal model to compute the junction temperature of an IGBT under real time operating conditions. The proposed computational model is based on transient thermal capacitance and power loss calculations. Insulated Gate Bipolar Junction Transistor is popularly used in mission safety critical applications such as aerospace. Usually mission critical application...
Boost converters are widely used in several applications such as solar PV systems, energy storage systems, etc. In order to improve its dynamic performance, several model predictive control (MPC) strategies have been proposed to govern this DC-DC converter. However, in general, they require long prediction horizons to achieve a stable closed-loop due to its well-known non-minimum phase behavior. A...
The current control techniques on ARP (Auxiliary Rescue Power) for elevator system are presented in this paper. The purpose of this system is to assure the safety of the passengers by using electric power stored in a battery during power outage. The conventional current controller used in converter and inverter are Proportional-Integral control and dead-beat control which require complex coordinate...
Distributed Generation has created the need for new types of smart dc grids developments. The multiple generation sources, bi-directional power flow, power flow time co-ordination and management bring significant benefits as well as challenges for current ac electrical grids and emerging dc microgrids. In particular, the effect of voltage weak distribution systems on protection concepts and approaches...
This work deals with the partial shading effect in the power curve of a PV solar array. Using a semiconductor device — MOSFET or IGBT — as electronic load added to a buck converter, it is possible to scan the power curve of a photovoltaic string and therefore empirically determine its optimum voltage, even in presence of partial shading. The aim of this paper is to give experimental details regarding...
The improvement of misalignment tolerance is a key challenge for the optimization of wireless power transfer (WPT) systems. WPT coil design plays an imperative role in improving the misalignment tolerance. However, misalignment tolerance needs to be considered along with the dynamics of the receiving coil. This paper presents a coil optimization method to improve misalignment tolerance according to...
In recent years, as an eco-friendly EV charging system, the wireless charging has become a topic due to the merits such as convenient, safety, and clean. In this paper, in order to realize a large-gap wireless charger which can communicate between the power feeding and receiving units without any additional communication device, a wireless power transfer (WPT) system using a single-ended push-pull...
The state of energy (SOE) of Li-ion batteries is a key indicator for the energy management and optimization of energy storage systems (ESSs) in smart grids and electric vehicles (EVs). In order to improve the SOE estimation accuracy, an electrical Li-ion battery model is presented in this study against the dynamic loads and the rate energy effects of the battery. Firstly, in order to take into thorough...
Central inverters are the most common configuration for large-scale photovoltaic systems. Under partial shading or any non-uniform conditions on the photovoltaic plant, several power maxima may arise. Conventional perturb and observe and other classical maximum power point tracking algorithms are capable of tracking a local maximum, but can not guarantee to operate at the global maximum. A solution...
This paper depicts a multifunctional control strategy applied in three-phase inverters, which are connected to the distribution network. The proposed strategy is able to inject active power into the electrical grid and compensate current disturbances simultaneously. The main goal of this flexible strategy is to improve the Power Quality at the point of common coupling allowing full or partial compensation...
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