電容式電壓互感器速飽和阻尼器優(yōu)化計(jì)算模型研究
[Abstract]:Capacitive voltage transformer (Capacitor Voltage Transformer,CVT (capacitive voltage transformer) is an important electrical equipment in 110kV and above voltage grade of power system. Because CVT is mainly composed of capacitance and non-linear inductor, it is easy to excite its own harmonic ferroresonance under transient condition. At present, the main method to restrain CVT ferroresonance is to install dampers on the secondary side of CVT. Due to the excellent performance and damping characteristic of velocity saturation damper, it is widely used in CVT dampers. The value of damper resistance plays an important role in the damping effect of damper. However, there is little research on the selection of resistance values of velocity saturated dampers, and only a large upper limit range of damping resistance can be calculated by some formulas. In addition, because the calculation model is simple, the results often deviate greatly from the actual engineering situation. Therefore, in engineering, generally through a large number of ferroresonance tests to finally determine the optimal damping resistance required for CVT, this method has a large workload, resulting in a great waste of manpower and material resources. In addition, the research of CVT ferroresonance simulation model based on electromagnetic transient calculation software ATP-EMTP improves the accuracy of damping resistance selection, but the calculation is very large, and the accurate parameters of each element are needed. Based on the ferroresonance phenomenon and circuit oscillation conditions, the optimal calculation model of damping resistance selection for CVT velocity saturation dampers is established in this paper. According to the equivalent circuit of CVT, the loop equation of CVT equivalent circuit is established at first, and then the partial differential equation of one-dimensional cubic constant coefficient must be satisfied by using this equation to derive the damping resistance reaching damping condition. By solving the mathematical equation, the damping condition of CVT ferroresonance is obtained. According to this condition, the range of damping resistance can be calculated easily, and the value of damping resistance can be limited to a very small range. The calculation model is used to calculate the damping resistance of two CVT products in Wuxi-Japan New Factory of Jiangsu Province. It is found that the damping resistance calculated by the model is very close to the engineering selection resistance. The correctness and feasibility of the calculation model are proved. The calculation of this method is small and it can be used to guide engineering design. In order to fully demonstrate the correctness of the optimization model, the methods of modeling, simulation and field experiment are used to verify the range of damping resistance calculated by the optimal model of the CVT velocity saturation damper in this paper. In the aspect of software simulation, the CVT simulation model is established by using EMTP-ATP software, and the range of damping resistance determined by the calculation model is simulated by ferroresonance. In the field of experimental verification, several damping resistance values in the range determined by the computational model are selected to carry out ferroresonance experiments respectively. The results of simulation and experiment show that the model can effectively dampen ferroresonance, and it is proved that the model can solve the difficult problem of choosing damping resistance of CVT dampers. A new idea is provided for the selection of damping resistance of velocity saturated dampers in engineering design, and it is of great significance to the design of CVT.
【學(xué)位授予單位】:華中科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:TM451
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