Parallel redundant power system and the control method for the same

a power system and control method technology, applied in power conversion systems, dc-ac conversion without reversal, electrical equipment, etc., can solve problems such as circuit complexity, load shortening, and possible serious economic loss, and achieve the effect of superior reliability

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a power system and control method technology, applied in power conversion systems, dc-ac conversion without reversal, electrical equipment, etc., can solve problems such as circuit complexity, load shortening, and possible serious economic loss, and achieve the effect of superior reliability

US20050073783A1Inactive Publication Date: 2005-04-07PHOENIXTEC POWER

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[0031] For a preferred embodiment of the present invention, a parallel (N+1) redundant power system utilizes a digital signal processor (DSP) as a controller applied to an on-line type UPS module, wherein an inverter of the UPS module is a half-bridge topology.

[0032] With reference to FIG. 1, the parallel redundant UPS system is composed of plural UPS modules (10)(101-10N) connected in parallel. If the output power of each UPS module (10)(101-10N) is high, all the UPS modules (10)(101-10N) are coupled through a power output distributor (POD)(20) to supply the composed power to the load. Otherwise, if the output power of each UPS module (10)(101-10N) is low, all the UPS modules (10)(101-10N) can coupled together via lines and then they collectively provide the power to the load without the use of the POD (20).

[0033] In order to perform a by-pass path (bypass function), all the UPS modules (10)(101-10N) are coupled to the AC input line voltage (Line in) in parallel. The power system...

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Abstract

A power redundant power system and a method for controlling the power system are presented, wherein the power system is composed of at least one inverter for supplying AC power to a load through a bus, a phase lock system to synchronize all output voltages of the inverters and a current sharing circuit to properly distribute the load current among all inverters. Each inverter is controlled by an unbalanced power to limit the increase of its cross current. Moreover, the information related to DC bus voltage is further applied to control the inverters, whereby the cross current is mitigated and entire power system is operated steadily.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention is related to a parallel redundant power system and the control method for the same, and more particularly to a power system that utilizes an unbalanced power calculation and a cross current limitation technique to control the response of the inverter. [0003] 2. Description of Related Arts [0004] With the almost total dependence of modern societies on electricity for employment, living, communication and entertainment, any disruption to an electricity supply brings about a temporary halt to civilization as we know it. Especially in the present age where a breathtaking variety of electronic products are widely used, serious economic loss may possibly occur if a company loses critical data when the electricity supply is suddenly interrupted. [0005] To solve the above problem, the uninterruptible power supply (UPS) has been developed for providing a stable power supply. The most important objectiv...

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Application Information

Patent Timeline

07 Apr 2005

Publication

US20050073783A1

IPC: H02M7/48; H02M7/493

CPC: H02M7/493

Inventors: LUO, HAN-SHENG; TIAN, SHOU-LONG