基于TTA檢測算法的三相負荷不平衡治理研究
[Abstract]:All kinds of nonlinear load and large capacity single-phase load connection make the distribution transformer in unbalanced operation state for a long time which seriously endangers the safe and stable operation of power system. The unbalanced adjusting and compensating device is an effective means to control the unbalanced phenomenon, and the compensation current detection algorithm is one of the key technologies that affect the compensation performance of the compensation device. In this paper, the detection algorithms of fundamental negative sequence and zero sequence current under three phase four wire unbalanced load are studied. To solve the above problems, the current detection algorithm based on time-domain transform (TTA) is analyzed in detail. The results show that the proposed algorithm can accurately detect the unbalanced components in the load when the three-phase voltage is symmetrical. However, when the voltage of the power system is asymmetric, there is an error in the detection of the unbalanced current component due to the phase locked loop (PLL) inaccurate phase locking error. In order to reduce the error caused by phase locking in TTA current detection algorithm when the voltage is asymmetric, a phase-locked loop (SOGI-PLL), which is combined with the second-order generalized integrator (SOGI) and the voltage positive sequence extraction link, is adopted. Simulation results show that the current detection combined with SOGI-PLL and TTA can effectively improve the accuracy of the traditional TTA detection algorithm. In addition, in order to improve the dynamic response speed of the filter in current detection, the second-order low-pass filter and band-stop filter are combined in series to filter. The dynamic response speed of the detection algorithm is greatly improved without affecting the detection accuracy. With the help of Matlab/Simulink, the simulation model of three-phase four-wire system is built, and the simulation analysis is carried out under the condition of voltage symmetry and asymmetry of three-phase power network, respectively. The simulation results show that, In both cases, the TTA current detection algorithm based on the generalized integrator can extract the negative sequence and zero sequence components of the load current quickly and accurately, and achieve the desired results. On this basis, the algorithm is applied in the field system, and the feasibility and practicability of the algorithm are further verified.
【學(xué)位授予單位】:西安科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TM732
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