Abstract
The circuit solutions and external appearance of frequency controlled volumetric hydraulic drives (VHD-FC) and their functional analogs, namely, pump controlled volumetric hydraulic drives (VHD-PC) and electromechanical drives with mechanical reduction gears (EMD-MRG) are presented. The appearances of VHD-FC devices implemented using different (currently available and prospective) machinery and hardware components are compared with one another. It is shown that the maximum effect from using VHD-FC devices is expected in the power systems of plants corresponding to the modern concept of constructing a fully electrical plant (FEP). It is shown that the efficiency of drives used in the power systems of a particular FEP is determined by the totality of partial competitiveness indicators (CIs) provided that the devices have equal or close values of the performance indicators (PIs) characterizing the functional purpose of the modules. The possibility of numerically estimating the competitiveness of different kinds of drives in terms of technical, economic, and operational PIs is demonstrated. The physical and technical capacities of drive structures are analyzed taking into account the future development of their machinery and hardware components, and the preferred drive application fields are pointed out. For VHD-FC, these are the power systems of FEPs with a limited range of smooth speed control of the outlet links operating under the conditions of sign-variable and shock loads with long-term movements of the outlet links under the effect of accompanying (negative) loads. It has been demonstrated that the VHD-FC structure makes it possible to effectively implement energy storage and recuperation in the drive itself and to transmit an almost unlimited amount of recuperative energy to the FEP’s external electric power network.
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