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Abstract
Taking a 1000 MW turbine generator as the research object, the short-circuit fault in electrical disturbance is analyzed. Since it is very difficult to carry out fault analysis experiments and research on actual systems, simulation analysis is one of the more effective means of electrical fault diagnosis; the simulation’s results approach the actual behavior of the system and are ideal tools for power system analysis, and can provide an empirical basis for practical applications. The short-circuit fault model of the SIMULINK power system is built to analyze the two types of faults of generator terminals short-circuit and power grid short-circuit. The impact load spectrum, fault current and speed fluctuation between low-voltage rotors were extracted and analyzed. The conclusion is that the impact value of electromagnetic torque at the generator terminal is greater than that on the power grid side. The impact value of a two-phase short-circuit at the generator terminal is the largest, and that of a three-phase short-circuit on the power grid side is the smallest. The transient impulse current of a three-phase short-circuit at any fault point is greater than that of a two-phase short-circuit; the impulse current of the grid side short-circuit is much greater than that of the generator terminal short-circuit; the speed fluctuation and fluctuation difference caused by the three-phase short-circuit in the grid side are the largest. The alternating frequency of the transient electromagnetic force of the four kinds of faults avoids the natural frequency of the torsional vibration of the shaft system, and the torsional resonance of the shaft system in the time domain of the short-circuit fault will not appear. However, after the fault is removed, the residual small fluctuation torque in the system has a potential impact on the rotor system. This research shows an analysis of the structural integrity and safe operation of turbine generator units after a short-circuit fault, which can not only be applied to engineering practice, but also provide a theoretical basis for subsequent research.
Highlights
A steam turbine generator set is the core component of power energy production, and at present, the main power energy production structure in China is still dominated by thermal power, which is gradually developing into large units with high capacity and high parameters
The analysis and calculation of shaft torsional vibration characteristics can be summarized as the analysis of dynamic response and inherent characteristics
1000 MW turbo-generator unit based on MATLAB/SIMULINK is built
Summary
A steam turbine generator set is the core component of power energy production, and at present, the main power energy production structure in China is still dominated by thermal power, which is gradually developing into large units with high capacity and high parameters. The correctness of the model reduction method and calculation program was verified by calculating the natural frequency and vibration mode of the torsional vibration of subsynchronous resonance simulator shafting. Navid et al [33,34,35] proposed a six-phase motor saturation CPVBR model, which contains the main flux saturation, achieving magnetic decoupling and constant RL grafting This new magnetic decoupling CPVBR (DCPVBR) model has many advantages, which can be interfaced with inductance and/or power electronic circuit components, and can be realized in common simulation programs. Zhao et al.’s [36,37] improved parallel algorithm constructed a graphics processing unit based on a compute unified device architecture, Appl. Improved parallel algorithm constructed a graphics processing unit based on a compute unified device architecture, and its performance was analyzed. At importance the same time, optimization basedresearch on a compute unified device architecture pounded of torsional vibration for a turbo-generator set, anaframework improve computing speed.vibration. In the electrical disturbance in the turbo-generator set [48,49]
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