Cost-effective practical developments of high-performance and multi-functional UPS with new system configurations and their specific control implementations

Hirachi, K.; Sakane, M.; Matsui, Teppei; Kajima, A.; Nakaoka, M.

doi:10.1109/pesc.1995.474853

Cited by 26 publications

(11 citation statements)

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“…The diodes (D1 to D4) are used to protect the capacitors from being negatively charged. Compared to the four high frequency power switches of conventional boost inverter [1], the proposed design uses only one high frequency power switch in each half cycle. The proposed design's reduction in the number of switching operations results in significantly improved system efficiency and reliability.…”

Section: Figure 4 Modes Of Operation Of the Proposed Boost Invertermentioning

confidence: 99%

“…The combined losses of the two inter-connected converter units to low system efficiency. The cascaded double design also makes for extra parts, greater system size and weight, [1][2][3]. The requirement of high voltage storage battery leads to high cost and reduced reliability, since the number of storage increases.…”

Section: Introduction Introduction Introduction Introduction Conventimentioning

confidence: 99%

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Single-Phase DC-AC Boost Converter

Odeh¹

2014

Nig. J. Tech.

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ABSTRACT ABSTRACTThis paper describes a new power conversion circuit topology for single This paper describes a new power conversion circuit topology for single This paper describes a new power conversion circuit topology for single This paper describes a new power conversion circuit topology for single dc dc dc dc----dc dc dc dc boost converter. It boost converter. It boost converter. It boost converter. It comprises an H comprises an H comprises an H comprises an H Change of load current flow is Change of load current flow is Change of load current flow is Change of load current flow is achieved with four current achieved with four current achieved with four current achieved with four current configuration configuration configuration configuration performs single stage power conversion, which minimizes switching losses and attains higher performs single stage power conversion, which minimizes switching losses and attains higher performs single stage power conversion, which minimizes switching losses and attains higher performs single stage power conversion, which minimizes switching losses and attains higher efficiency as compared to the conventional boost inverter. The steady efficiency as compared to the conventional boost inverter. The steady efficiency as compared to the conventional boost inverter. The steady efficiency as compared to the conventional boost inverter. The steady configuration and control strategy are described. A multi configuration and control strategy are described. A multi configuration and control strategy are described. A multi configuration and control strategy are described. A multi performance. Computer simulations demonstrate the feasibility of the proposed boost inverter.performance. Computer simulations demonstrate the feasibility of the proposed boost inverter.performance. Computer simulations demonstrate the feasibility of the proposed boost inverter.performance. Computer simulations demonstrate the feasibility of the proposed boost inverter.

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Section: Figure 4 Modes Of Operation Of the Proposed Boost Invertermentioning

confidence: 99%

Section: Introduction Introduction Introduction Introduction Conventimentioning

confidence: 99%

Single-Phase DC-AC Boost Converter

Odeh¹

2014

Nig. J. Tech.

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“…Besides, it also charges the battery through the battery charger. This charger rectifies the ac power to dc power for normal sustaining the live of the battery [4][5][6]. This means that the two relays are automatically controlled using logic gates.…”

Section: Block Diagram Of An Improvedmentioning

confidence: 99%

“…A UPS varies from an auxiliary or standby generator because it provides near-immediate protection from input power interruptions, by supplying energy stored in batteries [2][3]. The on-battery runtime of most UPS sources is relatively short down (only a few minutes) but sufficient to start a standby power source or properly shut down the protected equipment [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…A conventional standby power supply system is provided for supplying normal AC power to critical load AC power during the normal operating conditions, and for supplying emergency AC power to the loads during the failure of AC power source [3][4][5]; however voltage stabilization of inverter output at 220VAC was not assured. Then, since the conventional voltage source inverter (VSI) used in conventional standby UPS system and other applications such as photovoltaic systems (PV), AC motor drives has relatively small input voltage [6][7], it is needed to be stepped up in order to increment the output voltage amplitude to meet up with the non-linear load requirements and other electrical challenges.…”

Section: Introductionmentioning

confidence: 99%

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Practical Implementation of an Improved Standby Boost Uninterruptible Power Supply

Eya¹

2014

IJEPE

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This paper proposes a single phase pulse-width modulated (PMW) voltage source uninterruptible power supply known as an improved standby boost uninterruptible power supply (ISBUPS) which centers on keeping the output voltage of the inverter system of the UPS at constant voltage of 220V AC and ripple free when utility power supply fails. This concept is achieved by incorporating proportional integral (PI) controller, boost converter and L-C filter at inverter control section. In this research, apart from stabilizing the inverter output voltage of inverter at 220VAC in standby mode, 0.96 modulation index is also realized. The total harmonic distortion of the system is reduced down to 5.05%. This proposed system has its applications at homes, offices and in business centers especially in Nigeria where electrical power instability is high now.

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