An adaptive hybrid fuzzy-proportional plus crisp-integral current control algorithm (CCA)\nfor regulating supply current and enhancing the operation of a shunt active power filter (SAPF) is\npresented. It introduces a unique integration of fuzzy-proportional (Fuzzy-P) and crisp-integral\n(Crisp-I) current controllers. The Fuzzy-P current controller is developed to perform gain tuning\nprocedure and proportional control action. This controller inherits the simplest configuration; it is\nconstructed using a single-input single-output fuzzy rule configuration. Thus, an execution of few\nfuzzy rules is sufficient for the controller�s operation. Furthermore, the fuzzy rule is developed using\nthe relationship of currents only. Hence, it simplifies the controller development. Meanwhile, the\nCrisp-I current controller is developed to perform integral control action using a controllable gain\nvalue; to improve the steady-state control mechanism. The gain value is modified and controlled\nusing the Fuzzy-P current controller�s output variable. Therefore, the gain value will continuously\nbe adjusted at every sample period (or throughout the SAPF operation). The effectiveness of the\nproposed CCA in regulating supply current is validated in both simulation and experimental work.\nAll results have proven that the SAPF using the proposed CCA is capable to regulate supply current\nduring steady-state and dynamic-state operations. At the same time, the SAPF is able to enhance its\noperation in compensating harmonic currents and reactive power. Furthermore, the implementation\nof the proposed CCA has resulted more stable dc-link voltage waveform.
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