Double Integration Control for Single-Phase Unified Power Quality Conditioner Based on A Neuron Adaptive Harmonic Detection

This paper proposes a neuron adaptive harmonic detection algorithm which can adaptively,rapidly and precisely calculate the voltage and current reference signals in presence of the system frequency variation, according to which, a Double Integration Control (DIC) strategy is applied in Unified Power Quality Conditioner (UPQC) as an interface between the hybrid power system and the load.Generally, the UPQC consists of a shunt inverter, a series inverter and a DC-link capacitor, where DIC strategy is used separately in the shunt inverter and series inverter to force the output voltage of Voltage-Source Inverter (VSI) to track the reference value with high precision. The reference value for the shunt inverter is obtained based on the Recursive Least Squares (RLS). Simulation results demonstrate the effectiveness and reliability of the proposed detection algorithm and control strategy.