VTdrive Variable Speed Drive(VSD) Solutions for Low Harmonics
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VTdrive Variable Speed Drive Solutions for Low Harmonics Harmonics – A Growing Concern For Customers Harmonics are deviations from the ideal sinusoidal AC line voltage and current waveforms. These distortions are typically low in magnitude and can have an impact on the performance of your connected devices. With the advent of power electronics, non-linear loads and power switching devices such as Variable Speed Drives (VSDs), there is concern for a potential increase in the level of harmonic distortion conducted back onto the utility power lines. Potentially Compromising Harmonic distortion can impact your electrical systems in a number of ways: Conductor insulation overheating, higher temperature rise in transformers and motors resulting in shorter life, and instrumentation signal interference. Depending on your facility and the system parameters, these issues may have a significant effect on various elements of your installation. Facility engineers need to determine if, how and where to mitigate harmonic distortion in the power distribution system to reduce the risk of any serious consequences. Staightforward Solutions Fortunately, reducing harmonic distortion to acceptable limits is easily attainable. The Institute of Electrical and Electronics Engineers (IEEE) has created guidelines that set reasonable limits for harmonic current and voltage distortion for various systems and locations (IEEE 519-1992). Many software calculation programs are also available for you to help predict the level of harmonic content and determine the mitigation requirements for your installation. VTdrive® has the Answer By applying the appropriate technology, the effects of harmonics can be reduced, thereby minimizing the effects of potential damage to your assets. VTdrive offers a variety of low and medium voltage VFD options in small foot- print packages, engineered to minimize harmonic distortion at the source. Several proven harmonic mitigation techniques are available to meet your requirements for budget, space limitations and harmonic attenuation. VTdrive has a proven track record and large installed base of low harmonic VFDs in various industrial and commercial applications. These technologies include 18-pulse and active front-end converters as well as both active and passive filters, employed to minimize harmonics and adhere to IEEE 519-1992 standards.

Harmonic Mitigation Techniques Harmonic Solution Cost Comparison Active Passive 18 Pulse AFE Drive Horsepower Rating DRIVE HARMONIC MITIGATION TECHNIQUE COMMENTS This is an external solution that actively monitors harmonic distortion levels and injects cancellation harmonic current onto the line to meet IEEE 519-1992 at the power line where the active filter is connected. Cost effective on large common AC bus applications, such as low voltage motor control centers. Active Power Filter Passive Filters and 6-pulse AC Drives B condition in some installations. Use caution when applying this...

Active Power Filter Dr ive Tra n s fo rm e r xfm r %Z The active power filter solution injects harmonic and reactive current to limit the harmonic distortion, and improves displacement power factor for electrical distribution systems. It measures the entire load current, removes the fundamental frequency component, and injects the inverse of the remaining waveform for nearly complete cancellation of harmonic current. The filter is not focused on specific frequencies; rather it creates the required waveform based upon the input of its sensing circuitry by monitoring the load through current...

18-Pulse Converter with Auto Transformer Dr ive Tr a n s fo r m e r xfm r %Z VTdrive’s patented 18-pulse solution relies on a compact auto transformer feeding a diode bridge to reduce the harmonic current created by the AC drive. Compared to 6-pulse converters, the reduction in harmonic currents and total harmonic distortion is significant. This solution’s simple topology results in a reliable method for harmonic mitigation and improving power factor. Another advantage of using a multi-pulse drive over the addition of line reactors is that there is no drop in DC bus voltage as the load is...

Harmonic Mitigation and Compliance Application Guidelines 1 Take time to understand the benefits and drawbacks of each type of mitigation solution to assure you meet the requirements of the application and that you can live with any negative effects created by the chosen harmonic solution. 2 Perform a preliminary harmonic analysis on your system and explore the effects of using various harmonic mitigation methods. 3 Identify the required Point of Common Coupling (PCC) and apply most cost-effective mitigation techniques for that application. 4 Add a line reactor (or DC link choke if...

Medium Voltage AC Drives The VTdrive® family of AC drives is a proven solution that offers a variety of options for harmonic mitigation to comply with even the most stringent harmonic requirements. Lower your line harmonics simply and easily Technology with a track record The VTdrive family of AC drives represents the culmination of over 30 years of drive design and manufacturing experience. This compact, modular design offers advanced fan and pump control features designed to improve system performance and reduce energy consumption. In addition, built-in software algorithm adjusts output...

Packaging Configured Drives Motor Control Centers For your applications requiring low voltage AC drives mounted in wall or floor mount enclosures, the Configured Drives Program offers flexible packaging solutions for VTdrive Drives. A wide range of power, control, communication and operator devices ensure specific application requirements can be addressed. Drive enclosures can be sized and designed to meet most IP/NEMA/UL Type requirements allowing for installation in any type of environment. The CENTERLINE 2100 Motor Control Center (MCC) combines rugged durability and premium quality....