EPE Association: EPE-PEMC 2004 - Topic 06-4: Uninterrupted power supply (UPS)

EPE-PEMC 2004 - Topic 06-4: Uninterrupted power supply (UPS)
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2004 - Conference > EPE-PEMC 2004 - Topic 06: POWER SUPPLY > EPE-PEMC 2004 - Topic 06-4: Uninterrupted power supply (UPS)

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   Analytic Calculation Of The Dc-Link Capacitor Current For Pulsed Three-Phase Inverters
By Folker Renken [View]
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Abstract: For pulsed three-phase inverters with symmetrical load the capacitor current in the dc-link circuit is analytically calculated. These calculations can be applied for a constant dcvoltage as well as for sinusoidal modulated voltages and sinusoidal currents at the output. The additional load of the dc-link capacitor caused by harmonic currents of the filter circuit or by switching transitions of semiconductors is examined, too. At last, the calculations are examined by practical measurements.

   UPS Design For De-Ionised Water Cooling System Of 15 Mva Converter
By H. Weiss, A. Schmid, H.-G. Schwabe [View]
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Abstract: The de-ionised water cooling system of a 15 MVA static frequency converter of the German Railways is driven by a 20 kW induction motor fed by 50 Hz mains. An interruption of the 50 Hz grid results in a sudden stop of the flow of the cooling water, and this is accompanied with an overheating and pressurised steam generation inside the cooling system at high power dissipation points. Therefore, as a consequence of such a line interruption the plant presently has to shut down in an emergency procedure, even if the voltage dip at the 50 Hz side is only less than 1 second. The proposed UPS delivers energy to the motor of the pump for the de-ionised water at line voltage dips via a special converter arrangement from the 220 V battery of the plant respectively from the 16 2/3 Hz side providing smooth take-over of power and potential separation while yielding low freewheeling losses. The converter arrangement uses a surplus standard variable frequency converter and added components.

EPE-PEMC 2004 - Topic 06-4: Uninterrupted power supply (UPS)
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2004 - Conference > EPE-PEMC 2004 - Topic 06: POWER SUPPLY > EPE-PEMC 2004 - Topic 06-4: Uninterrupted power supply (UPS)
	[return to parent folder]

	Analytic Calculation Of The Dc-Link Capacitor Current For Pulsed Three-Phase Inverters By Folker Renken	[View] [Download]
Abstract: For pulsed three-phase inverters with symmetrical load the capacitor current in the dc-link circuit is analytically calculated. These calculations can be applied for a constant dcvoltage as well as for sinusoidal modulated voltages and sinusoidal currents at the output. The additional load of the dc-link capacitor caused by harmonic currents of the filter circuit or by switching transitions of semiconductors is examined, too. At last, the calculations are examined by practical measurements.

	UPS Design For De-Ionised Water Cooling System Of 15 Mva Converter By H. Weiss, A. Schmid, H.-G. Schwabe	[View] [Download]
Abstract: The de-ionised water cooling system of a 15 MVA static frequency converter of the German Railways is driven by a 20 kW induction motor fed by 50 Hz mains. An interruption of the 50 Hz grid results in a sudden stop of the flow of the cooling water, and this is accompanied with an overheating and pressurised steam generation inside the cooling system at high power dissipation points. Therefore, as a consequence of such a line interruption the plant presently has to shut down in an emergency procedure, even if the voltage dip at the 50 Hz side is only less than 1 second. The proposed UPS delivers energy to the motor of the pump for the de-ionised water at line voltage dips via a special converter arrangement from the 220 V battery of the plant respectively from the 16 2/3 Hz side providing smooth take-over of power and potential separation while yielding low freewheeling losses. The converter arrangement uses a surplus standard variable frequency converter and added components.