Load Voltage Control Operation Method for Hybrid Distribution Transformers Based on Improved Voltage Detection Algorithm

The changes in the distribution network load will affect the distribution network voltage, so the hybrid distribution transformer (HDT) needs to start or stop the load voltage compensation equipment according to the specific load situation. Due to the disadvantage of commonly used voltage rise and fall detection algorithms, this paper proposes a novel dq0 transformation detection algorithm, which takes the derivative of each phase voltage to construct a virtual three-phase voltage, and then performs dq0 transformation on three sets of virtual three-phase voltages. Finally, through simple logical judgment, the detection of single-phase power supply voltage drops and other conditions can be achieved. The advantage of this algorithm is that it only requires the addition of a filter with a smaller time constant to filter out higher-order harmonics, effectively avoiding the delay caused by the larger filter time constant in traditional detection algorithms, thereby improving the real-time and accuracy of detection. The simulation verification of the improved detection algorithm is implemented with the Saber simulation platform about the start and stop of the load voltage compensation device based on the detection signal.