Strategies for the PAMS Control of Module-Combined DC/DC Converters Available for All-DC Wind Farms

All-DC wind farms employing DC convergence and transmission obviate the requirement for large industrial AC transformers. This approach confers notable benefits in power density, construction cost, and system efficiency. A module-combined DC/DC converter is ideal for transmitting power generated by all-DC wind farms. Nevertheless, throughout the aggregation process, the output power of the wind turbine and the transmission power of the converter fluctuate in response to changing wind speeds. Substantial power losses occur in the module-combined DC/DC converter when wind speeds drop below the rated threshold, as all sub-modules receive maximum inputs. Hence, based on the wind turbine's power output characteristics, we introduce the Power Approximation for Module Shedding (PAMS) technique tailored to the module-combined DC/DC converter. PAMS aims to minimize power losses and enhance transmission efficiency in the converter. This is achieved by dynamically adjusting the number of sub-modules during the aggregation process to match the real-time wind turbine output power, thereby improving overall converter efficiency. Lastly, we validate the feasibility and effectiveness of the PAMS control method through simulation using MATLAB/Simulink.