AC Power Electronics Symmetrical Short Circuit in Power System for Large-Scale Stability
Keywords:
AC Power Electronics, Symmetrical Configurations, Short Circuit, Power System, Large-Scale StabilityAbstract
Symmetrical configurations in power electronics are critical for achieving large-scale stability in modern electrical systems. The system ensures balanced power distribution, minimized harmonics, and reduced electromagnetic interference (EMI) by employing symmetrical topologies, such as symmetrical converters or inverters. These designs inherently improve fault tolerance, as symmetrical structures distribute stresses evenly across components, enhancing system reliability. The proposed Two-zone Multi-Stability (Two-zone-MS) method enhances symmetrical configurations in power electronics, offering improved large-scale stability for modern electrical systems. This approach divides the system into two distinct zones—each zone operating with a separate stability control mechanism—while ensuring that the symmetrical topologies, such as converters or inverters, maintain balanced power distribution. The Two-zone-MS method dynamically adjusts the operating conditions of each zone, optimizing power flow and reducing disturbances. Simulation results for the proposed Two-zone Multi-Stability (Twozone-MS) method demonstrate significant improvements in the stability and efficiency of large-scale power electronic systems. In a simulated 200 MW renewable energy grid integrating solar and wind power, the Two-zone-MS approach was applied to a symmetrical inverter configuration. The results show that the system-maintained voltage stability within ±0.5% of the nominal voltage, even during transient disturbances, compared to conventional systems, which experienced fluctuations of up to ±2%. With the total harmonic distortion (THD) was reduced to 2.3%, a significant improvement over the 5% THD observed in systems without the Two-zone-MS method. The simulation also revealed that the system efficiency increased by 3%, achieving 97.2% efficiency in power conversion, compared to the 94.2% efficiency of traditional symmetrical inverter systems. Additionally, the fault tolerance mechanism of the Two-zone-MS method successfully isolated faults to a single zone, reducing the system’s recovery time from 20 minutes to just 5 minutes, thus minimizing downtime and improving overall system reliability
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