RESEARCH OF CURRENT MEANS OF COMPENSATING HIGHER HARMONICS OF CURRENT AND CAPACITY IN THREE-PHASE SYSTEMS
Journal Title: Вісник Кременчуцького національного університету імені Михайла Остроградського - Year 2018, Vol 1, Issue 110
Abstract
Purpose. To investigate the operation of three-phase electric motor of electric networks which is characterized by the absence of such capacity components such as reactive power and variable components of the active capacity as well as higher harmonics caused by asymmetry and harmonicas of the load. These undesirable components significantly de-crease the efficiency of the energy transfer and transformation. Methodology. General scientific methods have been used. Thus, existence of higher harmonics and a variable component in the consumed three-phase capacity decrease efficiency of the electromechanical energy transformation from the point of view of the consumed electric energy into the mechanic one with the use of three-side electric drive. Results. The following results have been revealed. Harmon-ics are known to cause such serious problems as decreasing efficiency of energy consumption; overheating cables, elec-tric motors and transformers; response of automatic switches; overheating and breaking down of capacitors; overload-ing neutral wires. Originality. Nowadays, the task of compensating higher harmonics components of the current re-mains topical. The active harmonics capacitor connected to the parallel non-linear load is one of the most widespread means of compensating higher harmonics of the current. Voltage oscillation is referred to as fast changes of the efficient value of the voltage that occur with the speed of 1–2 % of the normal voltage per second. Normalization of the voltage oscillations is done on the level of the influence on the human sight. Let us study the process of healthy perception of the oscillation (flicker). Practical value. The upper limit of the voltage oscillation that influences the sight with taking into consideration the constant time of the bulb filaments equals around 35 Hz with changes of voltage less than 10 %. The operation principle of the active harmonics capacitor is based on the analysis of current harmonics of non-linear load and generation of these current harmonics into the distributing net but with the reverse phase. References 17, figures 3.
Authors and Affiliations
N. Tretyak, Su Hongsheng
Keywords
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- EP ID EP659900
- DOI 10.30929/1995-0519.2018.3.32-37
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