Laboratory studies of the operation of a single-phase solid-state transformer when operating from a wind turbine

The article describes a laboratory equipment for studying the operation of a single-phase solid-state transformer when operating from a wind turbine. Oscillograms of currents and oscillograms of voltages are given during the operation of a solid-state transformer from a voltage source. To simulate a wind turbine, the "actuating mechanism - generator" assembly was used. Wind gusts were simulated using a frequency converter. The key elements of the solid-state transformer - a dual active bridge - were controlled by the phase shift method. Critical points were found that could not be foreseen in a theoretical or simulation study. The experiment showed the perspective of using new technologies to maintain a stable output voltage frequency and voltage level

Improving the Electricity Quality by Means of a Single-Phase Solid-State Transformer

The paper describes the use of a single-phase three-stage solid-state transformer in networks with non-sinusoidal voltages in order to improve the quality of electricity. An active-inductive load was chosen as the load. The solid-state transformer was simulated by the Matlab/Simulink software. Its performance was analyzed and the parameters for optimal performance were specified. The voltage and current graphs on the load and their spectral analysis are given. Total harmonic distortion was evaluated for current and voltage. As a comparison, the operation of a classic transformer was simulated. Modeling shows that solid-state transformer copes with improving the quality of electricity better than a classical transformer. In addition to improving the quality of the load current, the solid-state transformer protects the consumer from overvoltage, voltage dips, and other transient phenomena, due to the accumulated supply of electricity in the capacitors of the DC-Bus