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The paper deals with a transistor open-circuit faults diagnosis in a rotor field oriented controlled induction motor drive fed by a two-level voltage inverter. The diagnostic procedure ensures to detect and localize single power switch failures as well as single-phase transistor faults in a time shorter than one period of a stator current fundamental harmonic, without regard to a drive operation point...
A new control method to improve in transient response of parallel inverters in islanded Microgrids is presented in this paper. The conventional droop is a good choice for controlling VSIs in microgrid disconnected from main grid. But this method has some drawback such as inappropriate transient response. The proposed scheme, based on the droop control method, uses current feedback signal that passed...
The paper describes design and realization of the universal test bench intended for testing of electric traction machines for electric pallet truck and forklifts. The extreme parameters (Output current up to 500A and max. output voltage up to 600V) are desired for possibility to test prototypes of the motors with wide range of voltages and currents. Another unconventional parameter of this test bench...
Power sharing between inverters, microgrid modeling and stability analysis are hot research fields in microgrid research. Line impendence is an important parameter to improve accuracy of the power sharing and to improve the accuracy of the model of the microgrid system. Line impedance measure methods have been discussed in several papers. This paper summarized and analyzed each of these methods, identified...
The scale of a distributed grid-connected solar photovoltaic (PV) generation system keeps growing, which is naturally composed of many subsystems interacting with each other. In this paper, a novel distributed predictive control based on data-driven subspace approach is proposed to design the predictive controller of the grid-connected inverter in the distributed solar PV generation system. The control...
Integration of Electrical Vehicles (EVs) with power grid not only brings new challenges for load management, but also opportunities for distributed storage and generation in distribution network. With the introduction of Vehicle-to-Home (V2H) and Vehicle-to-Grid (V2G), EVs can help stabilize the operation of power grid. This paper proposed and implemented a hybrid V2H/V2G system with commercialized...
This paper describes a new method for the on-line parameter estimation of an induction heating system. Simulations and experiments are presented in order to measure its impedance matrix for more exact control in closed loop. In previous papers, various parameter identification methods including off-line methods were introduced and compared for current inverters. It has been demonstrated that parameter...
This paper presents the power-quality measurement results of a photovoltaic (PV) system connected to the distribution system of Peng-Hu Power System, Taiwan. The studied PV system with capacity of 70.38 kW is connected to the distribution system of 380 V through thirteen DC/AC inverters that are located at the top floor of one of the buildings of National Peng-Hu University of Science and Technology,...
Driving induction motors with PWM inverters through long distances result in several undesired high frequency phenomena, such as transient overvoltages at the motor terminals, common-mode currents flowing through the system and the presence of a cable charging current, among others. Instead of filters, which represent the traditional method for the mitigation of these problems, in a previous work...
One of the most challenging issues in most developing countries of the world today remains access to electricity. In areas where there is access to electricity, the epileptic nature of the supply and the inconsistency of the generated voltage and over loading pose a serious threat to the safety of electricity consumers equipment. In Nigeria, just like most developing countries, the situation is not...
This paper presents the precise measurement of the stator inductance as well as the stator resistance, using an inverter. Precise measurement results are created, although the actual output voltage of the inverter is not known exactly. This paper analyzes the different effects of an output power stage, and how they degrade the quality of the output voltage. This knowledge is used to cancel out this...
The effective efficiency of a photovoltaic system is strongly affected by varying factors such as partial shading. The centralized power conversion has limitations to mitigate that problem. As a possible solution the benefits of the distributed power conversion are explored and as an integral part of distributed power conversion an intra-module DC-DC converter is presented here to implement at substring...
In this work a method to detect insulation degradation of an adjustable speed drive (ASD) based on analyses of the transient current reaction caused by inverter switching is proposed. The drive system consists of an inverter fed three phase induction machine with 1.4MW. The standard current sensors are used to analyze the transient signal ringing to extract an insulation state indicator of the winding...
This paper presents a modified synchronous reference frame for Active Power Filter control (APF) to compensate for harmonics and reactive power for both balanced and unbalanced non-linear loads. The proposed controller autonomously detects different power quality problems, filters out load created harmonics and compensates for unbalances and/or DC offsets resulting from non-linear loads connected...
This paper presents a current controller for a transformerless single-phase two-level inverter grid connected by means of an LCL output filter and subject to a sever harmonic distortion in the grid voltage signal. The controller indirectly controls the grid-side current by controlling the inverter-side current. The inverter-side current controller is simpler to implement, moreover, it is shown that...
Photovoltaic (PV) energy harvesting suffers from output energy reduction due to shading, dirt accumulation or manufacturing variability. Typical PV modules consist of 60 solar cells connected in series. Hence, shading a single cell can cause a whole substring of 20 cells to be bypassed. To overcome these drawbacks, this paper proposes the application of boost converters on submodular level, cutting...
This paper describes a photovoltaic grid connected system using a modified fractional short-circuit current MPPT. This system is composed of two stages: dc-ac conversion stage and sensor stage. The adopted MPPT technique is based on the determination of the optimum slope of the power load line. Modeling is presented and a multi-objectives design is performed. The results are validated by simulation...
A promising solution to face the problems related to the integration of the Distributed Generation (DG) with a high renewable energy penetration level is to redesign the distribution grid using the concept of MicroGrids (MGs). Due to its constitutive components, production capacities, controllable loads and storage systems, a MG can contribute to the market either as load or production and its status...
To evaluate how power semiconductor properties in inverter circuit affect magnetic properties, we propose and test a new numerical analysis method. We have demonstrated magnetic properties depend on power semiconductors properties in an inverter circuit, so both properties should be taken into account. The proposed method combines an electrical circuit analysis for current-voltage properties of power...
Modern photovoltaic (PV) installations are being installed in large numbers. Manufacturers are using different harmonized standards to show compliance with the legislative requirements such as the European EMC Directive. Their selection of harmonized standards is not based on adherence to (essential requirements of) the European EMC Directive, but more on what is most convenient, i.e. lowest cost;...
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