Abstract
Conventional constant speed turbo air centrifugal compressor systems (TACCSs) consist of an electric motor driven at the constant speed and an inlet guide vane (IGV) for pressure control. TACCSs with an inverter for a variable speed drive (VSD) of the electric motor are more efficient than the conventional constant speed TACCS because they have a wide operating range and can minimize the power consumption. Therefore, this paper proposes a quadratic V/f control and VSD to reduce electrical and mechanical energy losses. To verify the energy saving effect of the TACCS with the proposed controls, this paper analyzes the performances of an electric motor drive system (EMDS) using the proposed quadratic V/f control considering load conditions of the turbo air centrifugal compressor (TACC) to reduce electrical energy losses. Furthermore, the performances of the conventional constant speed drive (CSD) using the IGV control and the proposed VSD were compared and analyzed in the test bench that represented an actual factory environment. As a result, the proposed quadratic V/f control and VSD experimentally verified energy savings of 4.44% and 23.37% compared to conventional controls. In addition, the economic feasibility of the proposed VSD was verified in the TACCS by analyzing the recovery period of the initial investment due to the addition of the inverter.
Highlights
With urgent demands for high efficiency policies, compressors are being developed to be large in scale, high in speed, and automatic in operation [1]
Air compressors are classified as positive displacement air compressors (PDACs) and turbo air compressors (TACs) according to the compression method [2,3,4]
This paper presents an energy saving effect types of a quadratic V/f control and variable speed drive (VSD) are proposed to improve the energy saving effect and economic of the turbo air centrifugal compressor systems (TACCSs).analysis results according to the use of the inverter
Summary
With urgent demands for high efficiency policies, compressors are being developed to be large in scale, high in speed, and automatic in operation [1]. To improve the operating efficiency and the pressure ratios, turbo air centrifugal compressors (TACCs) designed with a multi-stage impeller are widely used. They have a narrow operating range to avoid surge [12,13]. For the proposed quadratic V/f control, it utilizes the parabolic relationship tween a voltage magnitude and an operating frequency, resulting in a lower phase current between a voltage magnitude and an operating frequency, resulting in a lower phase magnitude and higher efficiency of the electric motor at low speeds [18,19].
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