Power conversion solutions offer low harmonic supply and good power factor

22 November 2000 Power Electronics / Power Management

The Harmony series is the only power supply designed to address all power quality issues. According to manufacturer, Robicon, its modular packaging offers flexibility and power converters provide clean power input, high power factor, fast response and almost unlimited output capability.

Robicon, a subsidiary of High Voltage Engineering (HVE), says that since its inception it has designed and manufactured equipment using the latest available device technology from the semiconductor industry. From AC and DC thyristor power converter systems at 50 kW to 100 MW and 100 to 100 000 A, to specialty-pulsed duty converters at 400 MW and 260 000 A, it has designed tailored equipment to meet specific customer requirements.

The latest Harmony products have a great degree of modular construction and flexibility to address a wider range of customer applications.

The series meets stringent requirements of the IEEE-519 1992 standards for voltage and current harmonic distortion, even if the source capacity is no larger than the supply rating. Robicon adds that the Harmony modules can also be supplied as separate units to answer various application, harmonic and power factor issues.

Benefits of this are:

* Avoids costly harmonic filters and the associated losses and resonance problems.

* Eliminates need for time-consuming harmonic analysis.

* Protects other on-line equipment from harmonic disturbance (computers, telephones, lighting ballast).

* Prevents interference with other power supplies.

* Reduced plant power disturbances and flicker.

The modules exceed 0,9 power factor throughout the operating range without external power factor correction capacitors.

When making the comparison between the Harmony power module design and the conventional thyristor (SCR) approach, Robicon says that one should consider the Harmony advantages of higher power factor, lower harmonic distortion signature and smaller physical size. The basis of this comparison should be the system components necessary to achieve the same performance characteristics.

The standard customer interface for control and metering consists of analog 4-20 mA or 0-10 V input and output signal levels. The on/off, protection and annunciation signals are derived via standard relay ladder logic in conjunction with control switches and door-mounted oil-tight pushbuttons and lights. Custom control options are also available.

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