Abstract
The failure of adjustable speed drive (ASD), which is sensitive to transient low voltage disturbance such as voltage sag and short duration interruption, will bring considerable loss to industrial users. Evaluating the disturbance tolerance ability of adjustable speed drives is the key to improve its tolerance. The voltage tolerance curve (VTC) is a tool to quantify the tolerance of voltage sag sensitive equipment including adjustable speed drives. However, the traditional test strategy for obtaining this curve is time-consuming and may introduce errors caused by the performance deterioration of the tested equipment. This paper proposes an analytical model of adjustable speed drive based on its response mechanism analysis to voltage sags. The model constructs a group of practical formulas for calculating the knee point of the voltage tolerance curve. The knee point can be used to quickly estimate the contour of the curve. This model can help engineers to conduct a first-cut assessment of the sag tolerance for drives to select equipment or design planning. Experimental tests are carried out to verify the effectiveness of the proposed method. Moreover, an application of the results is presented to improve the traditional test strategy.
Highlights
Adjustable speed drives (ASD) are widely used in industrial processes [1]
The voltage tolerance curve (VTC), which is derived from the computer and information industry immune curves CBEMA and ITIC, is a common tool to quantify the transient low-voltage disturbance tolerance of sensitive equipment [11]
For ASDs, various test conditions such as sag types and load levels need to be considered, and the interval among each test is longer than other kinds of voltage-sensitive equipment, such as AC contactor (ACC), programmable logical controller (PLC), and personal computer (PC)
Summary
Adjustable speed drives (ASD) are widely used in industrial processes [1]. Transient low voltage disturbances, such as voltage sags and short duration interruptions, have more significant impacts on high-end manufacturing users [2]–[7]. For ASDs, various test conditions such as sag types and load levels need to be considered, and the interval among each test is longer than other kinds of voltage-sensitive equipment, such as AC contactor (ACC), programmable logical controller (PLC), and personal computer (PC). These factors lead to a long test cycle, causing inconvenient evaluations and vulnerable equipment. Based on the working principle of ASD, the trigger conditions of protection under different voltage sag types are discussed Another practical model for calculating VTC knee points under each test condition is derived to complete the estimation of VTC contours. The application of the results obtained by the method in optimizing the traditional VTC test scheme is described
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