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White paper and application notes

Application Note - Improving multi-pulse Drives with Active Filters

This application note describes the possibilities to improve multi-pulse drives by applying relatively small Active Filter to the installation. Multi-pulse drives have several problems that causes them to behave like a non-ideal multi-pulse drive, e.g., the 5th harmonic is not fully eliminated. By using a well-tuned Active Filter inside the Multi-pulse drive, the drive can be adjusted to have a perfect multi-pulse behavior. It furthermore gives the opportunity to compensate the residual harmonics of the drive with the available capacity of the Active Filter. These improvements can be achieved even by retrofitting an Active Filter into existing multi-pulse drive applications.

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Application note: Global vs Local Compensation

This application note describes the benefits of global compensation over local compensation of harmonics in plants with numerous large variable speed drive, such as water treatment plants. By carefully applying global compensation instead of local compensation, a solution with a certain degree of redundancy is usually significantly more cost efficient. The results are general and does not only apply only to water treatment. It is also demonstrated that by carefully sizing a system, oversizing can be avoided.

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Comparing Harmonics Mitigation Techniques

The document at hand compares harmonic mitigation techniques in a range of applications and settings. Theoretical and practical comparisons are made between active and passive series and shunt filters. The overall context is to reduce harmonic loading in a drive system. Advantages and disadvantages of parallel and series approaches is discussed, as well as advantages and disadvantages of active and passive solutions. Practical results are discussed in a number of case studies.

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