One of the major objectives of ABB n.v. Power Quality Products (ABB) is the development of products to improve the quality of the electrical power supply, amongst which filtering systems. As a consequence, this division of ABB has a lot of experience in the field of electrical systems in presence of non- linear loads. Historically, the main goal of the development of active filters by ABB was to reduce the harmonic loading of electrical installations and as such solving technical problems or meeting Power Quality regulations. However, ABB receives more and more feedback from their customers that they observe better production efficiency when installing products to imprve the Power Quality of the electrical supply network.