With the continuous development of modern power systems, the requirements for system safety and reliability are also increasing. During the operation of the power system, it may lead to system failure due to various reasons, affecting the transient stability of the system. Therefore, it is of great significance to simulate the transient stability of the power system under fault conditions. Firstly, the basic concepts and influencing factors of the transient stability of the power system are introduced, and then the simulation model of the single-machine infinity system is constructed by using the relevant modules of SimPowerSystems under the MATLAB toolbox Simulink, and the system behavior under the condition of three-phase short-circuit fault is simulated, and the transient stability analysis is carried out. Finally, the measures and methods to improve the transient stability of the power system, such as rapid fault removal and electric braking, are discussed. The simulation results show that rapid fault removal and electrical braking can improve the transient stability of the power system.
In order to solve the problem of DC capacitor voltage fluctuation during the operation of five level cascaded H bridge, a new DC capacitor voltage balance control method is proposed based on the analysis of the current control method. The superposition of active current to reference current of each phase can control the balance of three-phase voltage, and the superposition of the voltage whose phase is same as the active current but sign is contrary to the modulation wave of two H bridge unit respectively. Then the capacitor voltage on the DC side is almost maintained near the given value. The simulation results verify the effectiveness of the proposed method.
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