Metered energy power supply increased stability

Sources of secondary power supply with metered energy based on valve-capacitor converters are increasingly being used in special technological electrical installations. Capacitors are widely used in them as a storage of electrical energy, which provide a metered transfer of energy from the electrical network to the load using power double-conductor switches. Power semiconductor switches must provide full charge and discharge of the metering capacitor in a quasi-resonant mode, which is not always achieved due to possible changes in load parameters. As a result, there is a violation of the converter's operating mode. The aim of the study is to examine the features of the current mode of a power supply with a dosed transfer of energy to the load when using various power semiconductor switches and corresponding control modes. As a result of the analysis of the valve-capacitor power supply, the presence of boundary conditions has been established to ensure its reliable operation when changing load parameters and control modes. To increase the stability of the converter in the secondary power supply mode, it is proposed to use fully controlled semiconductor switches in the form of bipolar transistors with an isolated gate of the JGBT type instead of partially controlled thyristor switches. A circuit solution of a converter with metered energy transfer in the mode of a secondary power supply of increased stability using IGBT transistors and synchronizing their operation from the AC supply network has been developed.