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This paper is based on an ongoing project that is evaluating the potential for a microgrid in a city in northwest region of the US. Power for the microgrid will be supplied largely from existing hydroelectric generators and proposed photovoltaic installations. This study focuses on the voltage profiles of all of the buses in the microgrid during different seasons of the year and identifies the ways...
Modelling and simulation of emerging DC shipboard power system (SPS) is required to validate the hardware design, converter control and protection algorithms. As DC SPSs may be large and complicated, the simulation of such systems using high fidelity models generally consumes much time and the validation of performance using multiple test scenarios becomes impractical. An alternative method is to...
The paper presents a Mixed Integer Linear Programming (MILP) model for the solution of the three-phase volt/var optimization (WO) of medium voltage unbalanced distribution feeders. The WO of a distribution feeder is aimed at calculating the most efficient operating conditions by means of the scheduling of transformers equipped with an on-load tap changer and distributed reactive power resources (such...
This paper deals with an integrated solid state controller (ISSC) for an isolated asynchronous generator (IAG) used in small hydro power generation for feeding three-phase four-wire loads. The proposed ISSC is used to control the voltage and frequency of IAG. This ISSC is realized using a three-leg insulated gate bipolar transistors (IGBTs) based current controlled voltage source converter (CC-VSC),...
This paper deals with a decoupled electronic load controller (DELC) for an isolated asynchronous generator (IAG), used in constant power pico hydro power generation for feeding three-phase four-wire loads. The proposed DELC is used to control the voltage and frequency in the decoupled manner. The proposed decoupled electronic load controller is combination of a voltage regulator (VR) for regulating...
This paper presents a design of an isolated star/hexagon transformer based ELC (electronic load controller) to regulate voltage and frequency of an isolated asynchronous generator (IAG) driven by a stand-alone uncontrolled pico-hydro turbine feeding three-phase four-wire loads. The proposed ELC is used to control frequency and voltage of IAG despite frequent change in consumer loads. Such an ELC is...
This paper deals with the voltage and frequency control of an autonomous induction generator (IG). In order to do that, a voltage source inverter (VSI) with a dump load (DL) circuit on its DC side is employed. The IG frequency is controlled by keeping constant the VSI synchronous frequency. For the IG voltage regulation two cascaded regulators are used, which have as reference the line voltage and...
This paper presents an investigation on a voltage and frequency controller (VFC), which functions as an improved electronic load controller (IELC) for parallel operated isolated asynchronous generators (IAGs) in an autonomous micro hydro power generation system. In such type of micro hydro scheme whole generating system is isolated from the grid and supply electricity to the remote communities. The...
This paper deals with a voltage and frequency control of an isolated asynchronous generator feeding 3-phase 4-wire loads in constant power applications where terminal voltage, excitation capacitor, speed and generated power of the generator remain constant under all operating conditions. The proposed controller functions as an improved electronic load controller (IELC) to regulate the frequency and...
This paper presents the comparison between available generator types: permanent magnet generator, induction generator, double fed induction generator and synchronous generator. Also describes the voltage buildup in a self-excited induction generator, the voltage variation with the chosen capacitor value, and a voltage control using static var compensator (SVC) with variable load and frequency.
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