Heuristic Control of Neutral DC Compensation Method to Moderate DC bias in Power Transformer

Abstract

Direct currents can cause significant half-cycle saturation issues with the power transformers used in HVDC systems, posing a serious threat to power systems. This research introduces a DC compensation mechanism for mitigating the negative consequences of DC bias. Using simulation models, DC effects on power transformers were examined. A heuristic controller was proposed as a suitable and novel control strategy for DC compensation device. Its robustness was evaluated by comparison with a conventional PI using the performance criteria such as settling time, oscillations, and transient response. The heuristic controller outperforms the conventional PI in controlling the compensation device to suppress half-cycle saturation based on the simulation results. A new path to mitigating half-cycle saturation of power transformers is shown.