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Electronic equipment such as computers, battery chargers, electronic ballasts, variable-frequency drives, and switched-mode power supplies generate perilous harmonics and cause enormous economic loss every year. Because of that, both power suppliers and power consumers are concerned about power quality problems and compensation techniques.
Harmonics surfaced as a buzzword in the 1980s and threatened the normal operation of power systems and user equipment. Harmonics issues are of great concern to engineers and building designers because they can do more than distort voltage waveforms; they can overheat a building’s wiring, cause nuisance tripping, overheat transformer units, and cause random end-user equipment failure. Thus, power quality (PQ) has continued to become a more serious issue.
As a result, active power filters (APFs) have gained much more attention due to excellent harmonic and reactive power compensation in two-wire (single phase), three-wire (three-phase without neutral), and four-wire (three-phase with neutral) AC power networks with nonlinear loads. Active power filters have been under research and development for more than three decades and have found successful industrial applications with varying configurations, control strategies, and solid-state devices.
However, this is still a technology under development, and many new contributions and new control topologies have been reported in the last few years. It is aimed at providing a broad perspective on the status of APF technology to researchers and application engineers dealing with power quality issues. In Chapter 1, the importance of active power filters and solid-state devices is explained in detail, and APF configurations and selection considerations of them are also presented.
In Chapter 2, proportional–integral (PI) controller–based shunt active filter (SHAF) control strategies (p-q and Id-Iq) are discussed in detail. SHAF control strategies for extracting three-phase reference currents are compared, with their performance evaluated under different source voltage conditions using a PI controller. The performance of the control strategies has been evaluated in terms of harmonic mitigation and DC link voltage regulation.
The detailed simulation results are presented to support the feasibility of proposed control strategies. To validate the proposed approach, the system is also implemented on real-time digital simulator hardware, and adequate results are reported for its verification. In Chapter 3, type 1 fuzzy logic controller (FLC)–based SHAF control strategies with different fuzzy membership functions (MFs) (trapezoidal, triangular, and Gaussian) are developed for extracting three-phase reference currents, and are compared by evaluating their performance under different source voltage conditions.
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