考慮交流非對稱的HVDC換流器開關函數模型及其應用
[Abstract]:With the wide application of HVDC transmission technology, DC system modeling has become the research focus in this field. As the most important device of DC system, the accuracy of converter model directly determines the validity of DC system modeling. When the traditional switching function model of converter is applied to the asymmetrical running state of AC system, the calculation precision is reduced. In order to improve the accuracy of the switching function model of the converter, the commutation process of the converter under the condition of three-phase asymmetrical operation is analyzed in detail, and the effect of the second harmonic current on the duration of the commutator is emphatically considered. The switching function model of converter considering valve conduction offset and phase changing angle is established. Compared with the traditional switching function model, the model established in this paper can improve the analysis accuracy significantly. In this paper, the switching function model of HVDC converter considering AC asymmetry is applied in three aspects. Firstly, the switching function model is applied to the dynamic phasor theory. Sampling from PSCAD and programming under MATLAB using dynamic phasor theory, the application of switch function model of converter in dynamic phasor theory is discussed, and the reliability of dynamic phasor theory is verified. Secondly, a switching function model considering AC asymmetry is used to analyze the fault of AC system with DC feed. The equivalent harmonic impedance model of DC side and the steady-state response model of DC control system are further established to form a DC system model suitable for the fault calculation of AC system, and it is combined with the traditional fault analysis model of AC system. The final fault analysis model of AC system with DC feed is formed. The validity of the model and the convergence reliability of the algorithm are verified by simulation and calculation. Thirdly, the mechanism of DC commutation failure caused by AC system fault is analyzed. Based on the analysis of commutation process in HVDC converter switch function modeling, the actual trigger conduction process of AC fault instantaneous converter valve is further analyzed. The mechanism of DC commutation failure caused by AC system fault is analyzed, and a prediction method of commutative failure is proposed, which is based on the mechanism analysis of DC commutation failure caused by AC fault. It can provide a theoretical reference for explaining some characteristics of commutation failure.
【學位授予單位】:華北電力大學(北京)
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:TM721.1;TM46
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