Uninterruptible Power Supplies
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2021 IEEE Photovoltaic Specialists Conference (PVSC)
Photovoltaic materials, devices, systems and related science and technology
The PCIC provides an international forum for the exchange of electrical applications technology related to the petroleum and chemical industry. The PCIC annual conference is rotated across North American locations of industry strength to attract national and international participation. User, manufacturer, consultant, and contractor participation is encouraged to strengthen the conference technical base. Success of the PCIC is built upon high quality papers, individual recognition, valued standards activities, mentoring, tutorials, networking and conference sites that appeal to all.
Energy conversion and conditioning technologies, power electronics, adjustable speed drives and their applications, power electronics for smarter grid, energy efficiency,technologies for sustainable energy systems, converters and power supplies
The Annual IEEE PES General Meeting will bring together over 2900 attendees for technical sessions, administrative sessions, super sessions, poster sessions, student programs, awards ceremonies, committee meetings, tutorials and more
IECON is focusing on industrial and manufacturing theory and applications of electronics, controls, communications, instrumentation and computational intelligence.
The IEEE Aerospace and Electronic Systems Magazine publishes articles concerned with the various aspects of systems for space, air, ocean, or ground environments.
Contains articles on the applications and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Power applications include magnet design as well asmotors, generators, and power transmission
Part I will now contain regular papers focusing on all matters related to fundamental theory, applications, analog and digital signal processing. Part II will report on the latest significant results across all of these topic areas.
Research, development, design, application, construction, installation, and operation of electric power generating facilities (along with their conventional, nuclear, or renewable sources) for the safe, reliable, and economic generation of electrical energy for general industrial, commercial, public, and domestic consumption, and electromechanical energy conversion for the use of electrical energy
Theory and applications of industrial electronics and control instrumentation science and engineering, including microprocessor control systems, high-power controls, process control, programmable controllers, numerical and program control systems, flow meters, and identification systems.
IEE Colloquium on Uninterruptible Power Supplies, 1994
2007 IEEE Vehicle Power and Propulsion Conference, 2007
In this paper the utilization of uninterruptible- power-supplies (UPS) in fuel-cell-vehicles is proposed. FCVs can take advantage of UPS for several purposes. It has been shown that fuel cell systems prefer constant load in order to operate reliably and with extended life time. At times when FCV load suddenly changes (e.g., acceleration, breaking) the condition of constant load on a ...
2013 Brazilian Power Electronics Conference, 2013
The digital implementation of an approach to the parallel operation of uninterruptible power supplies (UPS) is investigated. The method is developed in time domain and it relies on the natural tendency to synchronization of interconnected incrementally dissipative nonlinear oscillators. Simulations of two interconnected UPS systems to a given resistive load are carried out, taking into consideration specific problems associated with ...
IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics, 2006
This paper presents a control strategy applied for UPS with a low commutation frequency. An adaptive linear quadratic controller (LQR) for a DC/AC converter is presented. The controller gains are determined by minimizing a cost function. A recursive least square (RLS) estimator is used to identify the parameters model at different load conditions. The inductor current is estimated by a ...
2004 IEEE International Conference on Industrial Technology, 2004. IEEE ICIT '04., 2004
This paper will elaborate electrical performance test procedure for uninterruptible power supplies (UPS). The focus will be pointed to on-line one-phase UPS up to 3000 VA nominal output power that are mostly used for protection computer equipment. But the test procedure can be applied to three- phase UPS or off-line and line-interactive UPS and also for more powerful UPS. Test ...
Co-design of Power Amplifier and Dynamic Power Supplies for Radar and Communications Transmitters
APEC 2011-GaN Based Power Devices in Power Electronics
Breaking Speed Limits with GaN Power ICs - Dan Kinzer at APEC 2016
Next Generation Power Supplies - APEC 2016
ECCE Plenary: Pedro Ray, part 1
ECCE Plenary: Pedro Ray, part 2
What is the PSMA Power Technology Roadmap? APEC 2013 KeyTalk with Eric Persson
Challenges Associated with VHF Power Conversion - Anthony Sagneri at APEC 2016
Energy Innovations: The Hydrogen House
The Full Spectrum: Wireless Power Roundup
APEC Speaker Highlights: Robert White, Chief Engineer, Embedded Power
Coupled Electromagnetic-Thermal Simulation for High Power Wireless Power Transfer
William F. Tinney
Experience the Power of APEC
APEC Speaker Highlights - Doug Hopkins, University of Buffalo, Power Electronics/Smart-Grid
APEC 2015: KeyTalks - Power Technology Trends
APEC Exhibitor Showcase - Texas Instruments Power Management
APEC 2011-PSMA Power Technology Roadmap 2011 Summary
APEC 2012 - Dr. Vlatko Vlatkovic Plenary
In this paper the utilization of uninterruptible- power-supplies (UPS) in fuel-cell-vehicles is proposed. FCVs can take advantage of UPS for several purposes. It has been shown that fuel cell systems prefer constant load in order to operate reliably and with extended life time. At times when FCV load suddenly changes (e.g., acceleration, breaking) the condition of constant load on a fuel cell system is violated. Therefore UPS can be utilized to supply and sink portions of the load that might otherwise damage the fuel cell system. This paper reports design of an uninterruptible power system for vehicles. This work to a great degree is experimental and it demonstrates the feasibility of utilizing UPS in fuel-cell-vehicles.
The digital implementation of an approach to the parallel operation of uninterruptible power supplies (UPS) is investigated. The method is developed in time domain and it relies on the natural tendency to synchronization of interconnected incrementally dissipative nonlinear oscillators. Simulations of two interconnected UPS systems to a given resistive load are carried out, taking into consideration specific problems associated with the practical implementation in a Digital Signal Processor (DSP) based system.
This paper presents a control strategy applied for UPS with a low commutation frequency. An adaptive linear quadratic controller (LQR) for a DC/AC converter is presented. The controller gains are determined by minimizing a cost function. A recursive least square (RLS) estimator is used to identify the parameters model at different load conditions. The inductor current is estimated by a Kalman filter. The capacitor voltage and the inductor current are used as state variables. Simulation results show that the proposed strategy offers good performances for either linear and non-linear loads with low total harmonic distortions even at low frequencies making it very useful for high power applications
This paper will elaborate electrical performance test procedure for uninterruptible power supplies (UPS). The focus will be pointed to on-line one-phase UPS up to 3000 VA nominal output power that are mostly used for protection computer equipment. But the test procedure can be applied to three- phase UPS or off-line and line-interactive UPS and also for more powerful UPS. Test procedures are based on relevant standards (IEC 62040-3 31-Mar-1999: uninterruptible power systems (UPS)-Part 3: "method of specifying the performance and test requirements"; CSA C813.1-01: "performance test method for uninterruptible power supplies"; ...), but all those mentioned standards have international restrictions and they are applicable only for domestic use in some countries. This paper will propose unique test procedure only for electrical performances of UPS that can be applicable worldwide. In this paper it is excluded other UPS performances like noise, heating, weight, and other. Electrical performances that are observed are: input current total harmonic distortion (THDI), output voltage total harmonic distortion (THDU), input efficiency, output efficiency and autonomy time. It will be given electrical schema for testing each performance. Total harmonic distortion of current and efficiency will be distinguished for linear and nonlinear load. It will be given simple electrical schema for simulation nonlinear load. Total harmonic distortion of voltage will be distinguished for case when AC power is present and case when there is no AC power and battery starts to provide power for load. This paper will describe possible power problems (also power quality) in the electrical network and from which problems each UPS protect its load. Paper will present test results for almost twenty different UPS (power range form 500 VA to 3000 VA; and from different manufacturers).
Single phase uninterruptible power supplies (UPS) employ an inverter for DC to AC conversion. Advanced inverters consist of a full bridge transistor topology and an LC filter. An optimal inverter performance can be achieved if the output voltage is controlled by unipolar pulse width modulation (PWM). The paper describes the influence of the unipolar PWM on the voltages and the current within the inverter. Both frequency domain and time domain are used to evaluate the most important harmonics as well as peak and RMS values of the current and voltage ripple. This results in general equations suitable for the inverter design. In addition, two PWM schemes are compared with respect to EMI problems. Finally, measurements are presented which confirm the theoretical work.
This paper investigates the effectiveness of uninterruptible power supplies for providing protection against power surges to the load they serve-a group of interconnected personal computers (PCs). The surges simulated include the most common ones: surges due to lightning and capacitor switching, and fast transients due to operation of nearby end-use devices. Test results indicate that the protection depends very much on the type of the UPS.
The given paper deals with uninterruptible power supplies with supercapacitors. Parameters of the supercapacitors and common lead-acid batteries are compared. Various opportunities of supercapacitor implementation into the uninterruptible power supplies are discussed, pros and cons are analyzed. Initial numerical comparison of energy capacity for these devices is done. Experimental testing of the supercapacitors and batteries as energy sources for a boost converter has also been made.
Many applications of UPS systems require sinusoidal outputs at frequencies ranging from 50 Hz to 400 Hz. Important performance specifications for such systems include voltage regulation, total harmonic distortion, output impedance, transient response and operation with nonlinear loads. The most significant factors affecting the overall performance of the system are the power converter topology and the control or modulation strategy used. The most popular approach for realising such converters is through the use of voltage source DC link inverters operated with an LC output filter. The inverter is typically operated with a pulse width modulated strategy under feedback control to realise the desired output waveform. The output power rating and the output distortion specifications are generally used as the basis for the choice of switching frequency and LC filter size. The regulation quality of the output voltage is arguably the most important specification of the UPS system. Regulation quality will depend on the control strategy used. This paper reviews the analogue and digital control strategies used for realising sinusoidal ouput UPS systems.<<ETX>>
Many UPS systems do not perform as their purchasers intended leading to unreliability, expensive investigation of deficiencies and even litigation. The technical reasons are often a failure to appreciate and incorporate in the tender the system requirements: classically the nature of the typical nonlinear load causes many problems. For example, the paper shows how these waveforms can be defined and interpreted for performance against UPS specifications. UPS are needed where the loss of power can cause loss greater than the UPS cost, where safety and the law require a high integrity of supply, and where wind/solar installations need energy storage for continuity of supply. Some of these applications can stand short discontinuities whilst contactors operate or even longer for stator engine driven generators. In this review the classical UPS is examined with the inverter feeding the load and a static bypass is always available.<<ETX>>
This guide discusses various battery systems so that the user can make informed decisions on selection, installation design, installation, maintenance, and testing of stationary standby batteries used in uninterruptible power supply (UPS) systems. This guide divides the available technologies into the following three main categories: Vented lead-acid batteries (VLA); Valve-regulated lead acid (VRLA); Ni-Cd batteries (Ni-Cd). For each category, the ...
As presently stated in IEEE Std 446-1987.