Analysis and Optimisation of DC-Side Filter Capacitor Parasitic Parameters on Output Performance of Dual Three-Phase Rectifier Synchronous Generator

Abstract

The dual three-phase rectifier synchronous generator (DTP-RSG) is commonly used in areas such as electric vehicles, aviation and wind power generation because of its high power supply quality, good electromagnetic compatibility and strong fault-tolerant operation. However, when the load changes suddenly, the voltage at the DTP-RSG terminal fluctuates accordingly, which can negatively affect the overall performance of the power supply system. An electrolytic capacitor serves to store energy and stabilise the output voltage and is therefore commonly employed as a filter capacitor in DC power supply systems. The parasitic parameters, including the equivalent series resistance (ESR) and equivalent series inductance (ESL) of the filter capacitor, significantly influence the system's output. For this reason, this paper adopts an agent-aided optimisation method based on heuristic optimisation and intelligent algorithms to study the influence of the filter capacitor and its parasitic parameters on the output performance of the DTP-RSG. The objective is to reduce the difference between transient voltage and steady-state voltage, reduce the DC voltage ripple coefficient and improve efficiency to find the most suitable filter capacitor. Through experimental verification, the transient voltage mathematical model established in this paper has high accuracy. The results of the agent-aided optimisation method demonstrate that considering the parasitic parameters of the filter capacitor is crucial for analysing the output performance of the DTP-RSG, and selecting an appropriate filter capacitor can improve the power quality of the entire DC power system.