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首页> 外文期刊>Generation, Transmission & Distribution, IET >Dynamic analysis of multi-machine multi-UPFC power systems experiencing transient asymmetrical faults
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Dynamic analysis of multi-machine multi-UPFC power systems experiencing transient asymmetrical faults

机译：瞬态非对称故障的多机多UPFC电力系统的动态分析

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摘要

A new method for studying the transient asymmetrical shunt and series faults in multi-machine multi-unified power flow controller (multi-UPFC) power systems is proposed. Considering an arbitrary shunt or series fault in a power system, the method uses a combination of space phasors-based sequence networks corresponding to the fault. Synchronous machines and UPFCs are modelled via injecting sequence current phasors. The quasi-static Y-matrix equations of the network are solved first, to obtain the sequence voltages of the terminal bus-bars of synchronous machines. Then, these voltages are used to solve the non-linear equations of the machines (in the rotors d-q reference frames) in the subsequent step time ($Delta t$Delta t). This procedure is repeated until a steady-state condition is reached in the post-fault condition. The proposed method for fault analysis has high processing speed and acceptable accuracy, which is very important for online protection and control computations. Based on the proposed method, a computer program has been developed that is applicable for the fault analysis of modern or conventional power systems with any size. The performance of the proposed method is studied by some simulation results and compared with other similar works. The simulation results very well support the accuracy and efficiency of the method.
机译：提出了一种研究多机多统一潮流控制器（multi-UPFC）电力系统暂态不对称分流和串联故障的新方法。考虑到电力系统中的任意并联或串联故障，该方法使用了与故障相对应的基于空间相量的序列网络的组合。同步电机和UPFC通过注入序列电流相量进行建模。首先求解网络的准静态Y矩阵方程，以获得同步电机的端子母线的顺序电压。然后，这些电压用于在后续步骤时间（$ Delta t $ Delta t）中求解电机的非线性方程（在转子d-q参考系中）。重复此过程，直到在故障后条件下达到稳态条件为止。提出的故障分析方法具有较高的处理速度和可接受的精度，这对于在线保护和控制计算非常重要。基于所提出的方法，已经开发了适用于任何规模的现代或常规电力系统的故障分析的计算机程序。通过一些仿真结果研究了该方法的性能，并将其与其他类似工作进行了比较。仿真结果很好地支持了该方法的准确性和效率。

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