A NOVEL DESIGN OF FOURTH-ORDER HARMONIC PASSIVE FILTERS FOR ELECTRIC POWER DISTRIBUTION SYSTEMS OPERATING UNDER NON-SINUSOIDAL CONDITIONS

Abstract

ABSTRACT Harmonic filtering is an efficient way to reduce harmonic distortion in power systems. Numerous harmonic filtering approaches have been presented during the past decades to meet the spread of harmonic-generating loads. For medium and high-voltage systems, passive harmonic filtering is still the most popular method. Despite their extensive use, new filtering techniques are still needed to address the limitations of present schemes. The thesis presents a novel filtering technique, the fourth-order high-pass damped filter (DHPF4), for mitigating the harmonics and harmonic resonance effects of multi-pulse converter systems. This filter has not yet been used industrially. The filter's basic principle is a frequency-dependent damping block that can provide good damping efficacy across a broad frequency range. The filter has been proven to work with multi-pulse variable speed motors. This power passive filter (PPF) has not yet been designed optimally. In addition, there is no mathematical design that can guarantee that it will meet the required standard limits. This means that the features, benefits, and drawbacks of filter design must be looked under a wide range of design objectives and constraints [35] to ensure that they perform their functions efficiently. The novel mathematical design of the fourth-order filter is described in this thesis, as well as its optimal design based on different design objectives and taking into consideration the background of voltage harmonic distortion of the utility and the injected current harmonic distortion of the industrial consumers (hybrid non-linear and linear loads) present. The anti-resonance filter's performance has been examined using a single objective and multi-objective functions. To find the optimal solution, many search algorithms are used in conjunction with several nonlinear restrictions on the filter and system, as well as series and parallel harmonic resonance damping metrics to evaluate the filters' effectiveness to dampen resonance. Different power quality indices are handled as constraints in the optimal filter design, such as voltage limits, power factor requirements, and harmonic management restrictions reported in IEEE Std. 519-2014. A comparison of the various damped filters is also offered to assess the proposed filter performance. Filter design success has been confirmed by the outcomes.