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首页> 外文期刊>American journal of applied sciences >The Mathematical Model of Power System with Static Var Compensator in Long Transmission Line | Science Publications
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The Mathematical Model of Power System with Static Var Compensator in Long Transmission Line | Science Publications

机译：长输电线路带静态无功补偿器的电力系统数学模型科学出版物

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> Problem statement: It is becoming increasingly important to fully utilize the existing transmission system assets due to environmental legislation, rights-of-way issues and costs of construction and deregulation policies that introduced in recent years. The Static Var Compensator (SVC) has been proposed for the better control power flow and dynamic performance. The exact long transmission line model consists of the resistance and reactance. Most of previous researches studies transient stability performance of the SVC in SMIB System with neglecting resistance of the line. Thus the fully capability of the SVC on transient stability improvement of power system may not be applied. The consideration of the resistance causes in the difficulty of deriving mathematical model. Approach: This study investigates the effect of the SVC on transient stability of the power system with consideration the exact long transmission line mode. The concept of two-port network is applied to simplify the mathematical model of the power system. The proposed method is tested on sample system and compared on various cases. Results: The first swing of rotor angle curve of the faulted system without resistance is obviously higher than that of with resistance whereas the second swing of the faulted system without resistance is slightly less than that of with resistance. The system with the SVC can improve transient stability of power system. Conclusion: It is found from this study that the SVC and resistance of the line can improve first swing of rotor angle. The resistance of the line provides the negative effect on second swing of rotor angle. The simulation results indicate that for practical long line, the resistance is very import parameters for evaluating transient stability of power system.
机译： > 问题陈述：由于引入了环境立法，通行权问题以及建筑成本和放松管制政策，充分利用现有的传输系统资产变得越来越重要。最近几年。静态无功补偿器（SVC）已被提出来更好地控制功率流和动态性能。精确的长传输线模型包括电阻和电抗。以前的大多数研究都是在忽略线路电阻的情况下研究SMIB系统中SVC的暂态稳定性能。因此，SVC不能充分利用其改善电力系统暂态稳定性的能力。阻力的考虑导致难以推导数学模型。 方法：本研究在考虑确切的长传输线模式的情况下研究了SVC对电力系统暂态稳定性的影响。应用两端口网络的概念来简化电力系统的数学模型。该方法在样本系统上进行了测试，并在各种情况下进行了比较。 结果：无阻力的故障系统的转子角曲线的第一摆幅明显大于有阻力的故障系统，而无阻力的故障系统的第二摆幅则略小于有阻力的系统。具有SVC的系统可以提高电力系统的暂态稳定性。 结论：通过这项研究发现，线的SVC和电阻可以改善转子角的第一次摆动。线路的电阻会对转子角的第二个摆动产生负面影响。仿真结果表明，对于实际的长线路，电阻是评估电力系统暂态稳定性的重要参数。

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