Research of Electrical Test System and Simulation of Universal Converter Products Applied in DC Distribution Network

摘要

In recent years, the issues of energy depletion and power supply quality have received increasing attention. This has led to the emergence and continuous development of DC distribution network technology and renewable energy technology with unique advantages. At this stage, the state of the power grid is still based on a mature AC power grid as the main form. This makes a large number of applications of various converter products a foreseeable trend. In order to ensure the safe and reliable operation of such products, the research on its test technology is particularly important. This paper analyzes and studies the electrical test requirements and test methods of converter products, and proposes a technical scheme for the electrical test system of converter products. It is based on three full/half-bridge hybrid MMC converters. Through the parameter adjustment of the test system and the switching of multiple operating modes, the performance verification of different types of large-capacity converter products can be achieved with a small amount of active power consumption. PSCAD software simulation results also show that it can meet the electrical performance test requirements of universal converter products with single and dual power flow directions.