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This paper discusses the modelling and control aspects of an enclosed lowest converter-based shunt active power filter. In an AC distribution network, the shunt active power filter reduces harmonic interference. Using an interleaved buck converter architecture prevents the typical inverter’s shoot-through problem. The P-Q control method is utilised to provide compensating current. One loop controls the dc-link voltage while the other regulates the voltage mode. This technique uses a twin-loop architecture. For example, the park transformation and inverse park transformation are used in the current loop to take the load current into account. Current is controlled using hysteresis using a current limiting device. PWM is used to create switching pulses by the gate driver, a digital signal processor. All three parameters of a non-ideal voltage source can be figured out. For an unbalanced nonlinear load, the voltage at the source, the load’s current, and the source’s current have all been provided.