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This paper develops an analytical model to study the performance of dual-wound three-phase surface permanent magnet synchronous machines under normal operating conditions and various fault scenarios. A generic analytical model of inductance calculation is developed considering multiple layers of coils in the stator slots for different slot-pole combinations. The performance of three dual-wound machine...
High proliferation of Inverter Interfaced Distributed Energy Resources (IIDERs) into the electric distribution grid results in failure of the traditional overcurrent based fault detection at the point of interconnection (POI) of IIDERs. This paper focuses on other strategies of detection, namely, 1) using the transient content at the inverter output, 2) using zero sequence current magnitude at the...
In this paper an analytical model is presented to demonstrate the performance of a dual wound three phase surface permanent magnet synchronous machine. In addition to normal operating conditions, the model is extended to explain various fault scenarios of the machine. Self and mutual inductances of a dual wound machine with double layer winding are analytically calculated from winding function and...
Nowadays tendency of using renewable source is increasing due to environmental friendly nature of it and its economic benefits. One of the commons renewable sources is Photovoltaic (PV) system. Before utilizing PV system, operation of system in different conditions should be simulated in order to ensure stability and efficiency. This paper analyzed and simulated a PV system and observed the impact...
The objective of the paper is to present the modelling of the single phase grid connected Photovoltaic (PV) generation and its impact on low voltage grid. The network model has been developed in PSCAD software. The designed system includes low voltage network, single phase voltage source inverter (VSI) to control active (P) and reactive power (Q) flow to the grid and PV panel as the main source of...
Multilevel inverters (MLI) are extensively used in various fields. Among the different multi level inverters Three-level neutral-point-clamped (NPC) inverter has been widely applied in power conversions at medium and high voltages. Its usage has been increasing in low-voltage low-power applications. The three-level inverters have the problems due to faulty switches. The effects on the system for short...
Today's power industry faces lot of problem in maintaining the voltage stability and system stability. Installation of compensating devices proves to be a solution. But the cost of compensating devices adds burden to the consumer consumption changes. Hence a new method of utilizing fuel cell a renewable energy source as a compensating device is proposed in this work. Fuel cell is modelled as Staic...
Inverter current limiting in islanded networks during unbalanced faults can cause voltage distortion. By using the control system to emulate a parallel impedance, this distortion can be avoided whilst current control is maintained and fault current is delivered to the fault. Experimental results from a 10kVA inverter system are provided to verify the theoretical analysis that has been developed.
Nowadays RAMS (Reliability, Availability, Maintainability and Safety) standards are widely used in the contract for the procurement of railway vehicles in the world except Japan. In spite of this Japanese railway has good punctuality and reliability in its operation. The author points out a difference between Europe and Japan in the railway business through the investigation activity of onboard inverter...
Aiming at the power device open and close faults occurred in the inverter, GUI based simulation platform for inverter drive system under fault condition is studied primarily in this dissertation. Using the S-function block of the MATLAB, the S function of the motor is written. The SIMULINK blocks of the inverter under different power device faults condition are built by the basic blocks of MATLAB/SIMULINK...
The distribution grid is mainly built on a radial configuration where power is coming from one transformer substation to supply clients. Up to recently, in the rare cases where distributed generation existed, it was almost exclusively constituted of rotating machines, which have quite a different behaviour under fault than inverter-based sources. Consequently, current connection impact assessments...
To increase the fault tolerance for cascaded H-bridge inverter, an optimised reference waveforms generation method is proposed for cell-fault treatment of cascaded H-bridge inverter. The optimised reference waveforms were obtained by normalization of the unbalanced phase voltage fundamental, and which were used to replace the sine wave reference signals in pulse width modulation process to improve...
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