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This paper proposes method a to increase the electric power dispatched to the grid in a thermoelectric plant. The proposed improvement is based in a reduction of the auxiliary services' demand. This demand reduction is obtained by improving the power factor and reducing the active power losses in the auxiliary services. The power factor is improved by the installation of capacitors to supply reactive...
Electrical Power Quality represents a challenging as much as attracting research topic nowadays, with consequences to all economic areas. Here, we studied the alternatives for reactive compensation in a residential low-voltage distribution grid using the Alternative Transient Program (ATP-EMTP). We developed a simulation model based on the results obtained from field measurements in a low voltage...
It is acknowledged that Distributed Generation, in spite of the benefits that it provides, causes harmonics problems due to the power converter interfaces. In this paper, a generic approach is adopted to reduce the harmonic injection from converter-connected DG units, using a phase-shifting technique. By changing the vector group between transformers that connect with either converter-connected DG...
Growing numbers of consumers distort AC networks with harmonics. Therefore suppression of the network pollution should be considered. This problem can be solved by using "network-friendly" converters. In this article some consumers are presented that pollute the single-phase AC networks with harmonics. Therefore the network voltage waveform will be distorted. In our study we examine the...
This paper focuses on two power quality effects that are noticed with power electronic appliances. One effect is a harmonic oscillation by inverters of photo voltaic systems because they bring a high parallel capacitance to the grid and negative output impedance. The other effect is a sub-harmonic oscillation due to the negative differential impedance of constant power loads. This paper discusses...
Along with increasing demand on improving power quality, the most popular technique that has been used is Active Power Filter (APF); this is because APF can easily eliminate unwanted harmonics, improve power factor and overcome voltage sags. This paper will discuss and analyze the simulation result for a three-phase shunt active power filter using MATLAB/Simulink program. This simulation will implement...
This paper describes an improvement method of power quality of electric distribution system using matrix converter. The matrix converter makes it possible to improve the power quality of the consumer distribution system by suppressing voltage fluctuation on the consumer side without transformers. However, as the matrix converter deals with single-phase load in the system, input current harmonics are...
Industrial installations require high reliability and performance, especially when the power system has a low short- circuit level and non-linear loads injecting harmonics which can generate electromagnetic interferences EMC/EMI threatening functionality and safety related with control and protection systems. Conventional passive harmonic filters compensate reactive power, and reduce parallel resonances...
Dynamic voltage restorer and STATCOM are normally employed as a solution for mitigation of voltage sag and swell. This paper presents modelling and analysis of PWM switched autotransformer as a mitigating device for voltage sag and swell disturbances. The proposed system has less number of switching devices and has good compensating capability in comparison to commonly used compensators. Simulation...
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