An 18-pulse rectifier based on a step-up or stepdown autotransformer in star-fork connection is presented. The voltage vector diagram of the autotransformer is given out and the connection of windings is also analyzed. By arrangement the secondly windings properly, the output voltage can be set in a wide range below or above the 3-phase uncontrolled rectifier with a low THD in the input current. Key analysis and results obtained via the Matlab simulation and some experimental results are presented for validation of the presented work.
This paper presents a centralized control system that coordinates parallel operations of power conditioning system (PCS) for battery energy storage system (BESS) in charge-discharge-storage power station. An overall energy management system is implemented to optimize power flow among different battery energy storage systems during both grid-connected and islanded operations. In islanded mode, the traditional load sharing strategy will result in battery aging and increased circulation if the state of charge (SOC) of each battery is different. Therefore, a power allocation strategy based on SOC and module capacity is designed, which can make full use of the total capacity of the parallel system. The design concept of the proposed centralized control system is evaluated through simulation and experiment studies under different test scenarios.
This paper presents a physicals process hypothesis about the IGBT failure in according to the complex physical phenomena of IGBT burned when high-frequency arc-starting, after the analysis of pulse-transformer mathematical model and IGBT mathematical model, the corresponding simulation models are established, combining the specific experiments, the results show that the hypothesis is correct and reasonable, then a more reliable drive circuit is designed. It gives certain guiding significance to reliability design of plasma cutting power or other powers..
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