Abstract
The paper presents and discusses the problems associated with reactive power compensation of nonlinear loads. Analytical results and simulation studies for selected high power drive used in mine when apply dynamic compensation together with active harmonics filters are presented. It was found that application of active power filters allows for compensation high current harmonics in general, and suppression of as reactive power flows as well as current harmonics in the network. On the basis of results conclusions on efficiency of the active on-line compensation of non-linear loads of a high power are formulated. this problem an application of active power filters is necessary. They can be developed based on selected electric energy concept. We found that the most convenient is the use of theory of the physical current components (1). The paper presents and discusses the problems associated with reactive power compensation of non-linear loads. Analytical results and simulation studies of compensation for selected high power non-linear load using dynamic compensation combined together with application of active current harmonics filter are presented. II. THEORETICAL BACKGROUND For the analysis of periodic non-sinusoidal waveform commonly used is the Fourier representation being the series of trigonometric terms of frequencies as follows (2)
Highlights
In industrial applications there are high power motor drives which require speed control
It is related to the presence of distorted voltage waveform and the associated significant flows of reactive power together with power factor value degradation of any power source
In the case of a linear load RL type, reactive power compensation is performed based on the resolution of the current into two components
Summary
In industrial applications there are high power motor drives which require speed control. In mining, they include mine host drives, the main ventilation and drainage engines, large air compressors and various pumps. For drives of a low rated power (up to about 300-400kW) uncontrolled rectifiers (diodes type) are commonly used, while for high power- the controlled rectifiers respectively. They draw current of highly distorted sine waveforms so we include them for nonlinear loads. Waveform of the current consumed by the rectifier is strongly deformed and in the case of use of the controlled rectifier is shifted with respect to the source voltage.
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