Three-phase UPS System Research Articles

"Enhancing Customer-Centric Design In Three-Phase UPS Systems: Insights From Bengaluru's Industry Professionals And Innovation Trends"

This study investigates the impact of customer-centric design on three-phase UPS systems, focusing on industry professionals in Bengaluru. As demand for reliable and adaptable UPS systems increases, understanding how customer-focused design influences satisfaction is crucial. A mixed-method approach was used, starting with qualitative interviews of 30 industry experts to explore key themes, followed by a quantitative survey of 300 participants to assess customer satisfaction and design factors. The tools developed for this study included a semi-structured interview guide for qualitative data and a structured survey questionnaire for quantitative data collection, both validated through pilot testing. Key design factors such as reliability, scalability, ease of use, modularity, and energy efficiency were analyzed. Descriptive statistics revealed high mean scores for these factors, while correlation and factor analyses showed strong positive relationships with customer satisfaction, particularly for ease of use (r = 0.812) and scalability (r = 0.770). Thematic analysis emphasized the importance of AI-driven predictive maintenance and customization in improving system performance. The results indicate that larger companies more effectively implement customer-centric practices, while smaller firms face challenges such as cost constraints and technical limitations. The study recommends enhancing modularity, energy efficiency, and AI-driven maintenance to improve customer satisfaction, with a focus on helping smaller companies overcome these barriers. In conclusion, customer-centric design significantly enhances customer satisfaction in the UPS industry, and adopting these strategies is essential for long-term success and competitiveness.

"Enhancing Customer-Centric Design In Three-Phase UPS Systems: Insights From Bengaluru's Industry Professionals And Innovation Trends"

This study investigates the impact of customer-centric design on three-phase UPS systems, focusing on industry professionals in Bengaluru. As demand for reliable and adaptable UPS systems increases, understanding how customer-focused design influences satisfaction is crucial. A mixed-method approach was used, starting with qualitative interviews of 30 industry experts to explore key themes, followed by a quantitative survey of 300 participants to assess customer satisfaction and design factors. The tools developed for this study included a semi-structured interview guide for qualitative data and a structured survey questionnaire for quantitative data collection, both validated through pilot testing. Key design factors such as reliability, scalability, ease of use, modularity, and energy efficiency were analyzed. Descriptive statistics revealed high mean scores for these factors, while correlation and factor analyses showed strong positive relationships with customer satisfaction, particularly for ease of use (r = 0.812) and scalability (r = 0.770). Thematic analysis emphasized the importance of AI-driven predictive maintenance and customization in improving system performance. The results indicate that larger companies more effectively implement customer-centric practices, while smaller firms face challenges such as cost constraints and technical limitations. The study recommends enhancing modularity, energy efficiency, and AI-driven maintenance to improve customer satisfaction, with a focus on helping smaller companies overcome these barriers. In conclusion, customer-centric design significantly enhances customer satisfaction in the UPS industry, and adopting these strategies is essential for long-term success and competitiveness.

A three-phase off-line UPS system for transformer coupled loads

A three-phase off-line UPS system for transformer coupled loads

An Adaptive Linear Quadratic Regulator for Three-phase UPS System Powering Nonlinear Loads

This paper presents a control strategy applied to three-phase uninterruptible power supplies with a low switching frequency (1500Hz). In The controller design, the gains are determined by minimizing a cost function, which reduces the tracking error and smoothes the control signal. A recursive least square estimator identifies the parameters model at different load conditions. Then the linear quadratic controller gains are adapted periodically. The output voltage is the only state variable measured. The other state variables are obtained by estimation process. Simulation results show that the proposed control strategy offers good performances for either linear and non-linear loads with low total harmonic distortions (THD) even at low frequencies making it very useful for high power applications.

An adaptive sliding-mode control technique for three-phase UPS system with auto-tuning of switching gain

This paper presents an adaptive sliding-mode control (ASMC) technique for a three-phase UPS system with an auto-tuning mechanism of the switching gain. First, a sliding-mode control (SMC) scheme for the three-phase UPS inverter is designed to guarantee the robustness against the system uncertainties and external disturbances. Then, through addition of an adaptive control term, the ASMC algorithm is developed to optimize the switching gain without the prior information of the unknown and bounded uncertainties. It is shown that the upper bounds of the uncertainties are not required to be known in the SMC design. Also, the chattering problem in the reaching mode is considerably alleviated and the excessive use of electric power can be reduced by avoiding overestimation of the switching gain. Both the stability and robustness of the proposed ASMC method are proven by using the Lyapunov theory. In addition, a simple sliding-mode observer is used to estimate the load current without any additional current sensors. Therefore, the proposed ASMC system can accomplish the superior control performance (such as faster voltage recovery under a sudden load change, smaller steady-state error under parameter deviations, and lower THD under nonlinear load) compared to the conventional SMC scheme. Finally, the performance verifications of the proposed algorithm are carried out through the comparative simulation and experimental results on a prototype 1-kVA three-phase UPS inverter using TMS320F28335 DSP.

Low-THD, Fast-Transient, and Cost-Effective Synchronous-Frame Repetitive Controller for Three-Phase UPS Inverters

This paper presents a novel synchronous-frame repetitive controller for three-phase UPS inverters. Distinguished from conventional repetitive control techniques, the proposed synchronous-frame approach minimizes the repetitive control time delay to one-sixth of the fundamental period such that the dynamic response is significantly improved. In order to overcome the harmonic distortions under severe load conditions (e.g., unbalanced and nonlinear), in this paper, three synchronous rotating frames are deliberately selected, in each of which the repetitive controller is incorporated. Resultantly, the (6n ±1)th harmonics as well as the triplen harmonics are compensated. Moreover, a high-performance fourth-order linear phase infinite-impulse-response filter is applied to further enhance the accuracy of steady-state tracking. The proposed controller is programmed on the 16-bit fixed-point digital signal processor (TI TMS320LF2407) and eliminates high-resolution current sensors for cost effectiveness. Simulations and experimental tests have been carried out based on an 18-kW three-phase UPS system. Low total harmonic distortion (<;0025;) has been achieved under heavily distorted nonlinear load and unbalanced load. Fast dynamic response has been demonstrated during step load transients.