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Control of a three phase AC-DC power converter comprising three single phase modules

A technology for power converters and DC converters, which is applied in high-efficiency power electronic conversion, conversion of AC power input to DC power output, and output power conversion devices, etc., can solve problems such as instability

Active Publication Date: 2016-12-28
RECTIFIER TECH PACIFIC PTY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This arrangement is unstable at high power unless the neutral is connected

Method used

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  • Control of a three phase AC-DC power converter comprising three single phase modules
  • Control of a three phase AC-DC power converter comprising three single phase modules
  • Control of a three phase AC-DC power converter comprising three single phase modules

Examples

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Embodiment Construction

[0051] Referring now to the accompanying drawings, figure 1 A single phase converter with two power conversion stages is shown. A Power Factor Correction (PFC) stage contains rectification means and current control means, enabling the PFC stage to draw a current proportional to the input voltage and deliver energy to the storage capacitor C. Since the AC input voltage is a sine wave at say 50Hz (depending on the mains frequency), the current delivered to capacitor C will vary from zero to twice the average value at twice the input frequency, or 100Hz. Capacitor C must be sized to withstand the 100Hz ripple current and also allow acceptably small voltage ripple at 100Hz.

[0052] Typically in single-phase converters, the input current demand is determined by regulating the voltage across capacitor C and with a low bandwidth (say 5Hz) so that the ripple voltage appearing on the capacitor does not significantly interfere with the input current demand (which would resulting in i...

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Abstract

The invention relates to a power converter and method for controlling the same. An isolated AC to DC power converter operating from a three phase AC supply without a neutral connection whilst providing wide bandwidth output and immunity from high supply impedance. The converter comprises three single phase two stage AC to DC converters whose inputs are connected in star (or wye) and whose outputs are connected in parallel. They are controlled in a new way to balance the star point and share the power evenly. The single phase converters can be optimized for cost, efficiency, and reliability.

Description

technical field [0001] The present invention belongs to the field of power electronics, and more particularly relates to power conversion from a three-phase alternating current (AC) input to a single isolated direct current (DC) output and its control. Background technique [0002] In three-phase power conversion, it is desirable to draw power equally from all three phases to obtain maximum output from the AC power source and minimize losses in the AC power source. While there are many three-phase power converter topologies that can be considered, it is tempting to consider three single-phase AC-to-DC converters that enjoy high efficiency, high reliability, low noise, and low cost. These single-phase converters are optimized for phase to neutral voltage in terms of the ratings of their components, so usually these single-phase converters cannot be connected phase-to-phase (in this case 1.7 times the voltage occurs) . It is possible to simply connect these converters in a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/162H02M1/42H02M3/07
CPCY02B70/10
Inventor 奈杰尔·查尔斯·梅钦朱里安·德克特尔
Owner RECTIFIER TECH PACIFIC PTY LTD
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