共查询到16条相似文献,搜索用时 200 毫秒
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TCSC(Thyristor Controlled Series Capacitor)补偿装置具有灵活控制传输线中的功率流,改进系统的稳定性,提高传输能力等优点,提出一种考虑电阻的TCSC等效阻抗的计算方法,并用这种方法分析了TCSC的阻抗特性,对TCSC的实际应用具有指导意义。 相似文献
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《微型机与应用》2018,(4):100-105
传统的逆变器与柴油发电机并联系统中,逆变器采用PQ和V/f控制切换的方式实现并网与独立运行,模式切换存在失败的风险。提出了采用下垂控制的逆变器与柴油发电机并联运行控制策略,避免控制策略的切换,实现双模式的无缝切换。首先详细分析了采用下垂控制的逆变器与柴油发电机不能实现功率均分的原因,指出逆变器的等效阻抗等于逆变器与柴油发电机容量比的倒数乘以柴油发电机的等效阻抗是实现功率均分的充要条件。其次,引入虚拟阻抗削弱线路阻抗模型中的阻性成分带来的功率耦合,并使逆变器的等效阻抗满足功率均分的充要条件。最后利用MATLAB/Simulink仿真软件对所提方法进行了验证。 相似文献
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柔性交流输电系统(FACTS)技术的出现,为提高电网的可控性与可靠性提供了更新更有效的方法,已经成为近年来电力系统所研究的前沿课题之一。静止无功补偿器(SVC)和可控串联补偿器(TCSC)做为FACTS装置中应用最广泛的重要组成成员,是提高电力系统稳定性最有效的工具。因此,研究SVC与TCSC在电力系统中的应用具有非常重要的理论意义和实用价值。本文研究TCSC、SVC的特性,推导出它们的参数模型。通过Matlab软件,建立了SVC与TCSC两种FACTS装置的仿真模型。TCSC为串联补偿装置,通过连续改变其等效阻抗,从而改变输电线路上的串补程度;SVC为并联补偿装置,改善系统的功率因数。通过改变晶闸管的触发角,对晶闸管进行控制。 相似文献
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孤立直流微电网中,由于并联变换器所带负荷的波动与线路阻抗的不同,因此会存在直流母线电压降落和变换器间的环流问题.提出一种无源控制与PI控制结合的新型三闭环控制策略,以无源控制为电流内环,PI控制为中间电压环,线路阻抗补偿为最外环,既实现了对于扰动快速的无静差的跟踪,又有效的抑制由于线路阻抗不同而产生的并联变换器间的环流.为了验证所提出的控制策略,以两个BOOST变换器并联为例,在Matlab/Simulink中搭建仿真模型,将传统的无源控制与新型的控制策略进行比较分析,仿真结果表明,所提出的控制方法可以使电压无静差的跟踪负荷变化,而且基本消除了环流,最后,在RT-LAB的半实物仿真平台进一步验证了方法的有效性. 相似文献
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基于反馈线性化的TCSC滑模控制 总被引:1,自引:0,他引:1
针对含可控串联补偿(Thyristor Controlled Series Compensation,TCSC)的电力系统非线性强及易受外部扰动的特点,应用反馈线性化方法和滑模变结构控制理论,设计了提高系统稳定性的可控串联补偿滑模控制器。通过引入反馈控制变量,基于状态反馈线性化理论实现了对非线性模型的精确线性化。采用极点配置方法设计滑模切换函数,从理论上保证发电机转子方程具有期望的极点。为了减小抖振采用指数趋近律和准滑动模态方法求取滑模控制律,使得设计的可控串联补偿非线性控制律形式简洁,鲁棒性好。为了验证该控制策略的有效性,在Matlab/Simulink环境下建立了基于反馈线性化的可控串联补偿滑模控制系统仿真模型,进行了仿真研究。仿真结果表明,与传统的控制方式相比,设计的控制器能有效地阻尼系统振荡,增强系统的暂态稳定性。 相似文献
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Zhizhong MAO 《控制理论与应用(英文版)》2009,7(1):81-86
In order to design an optimal controller for the thyristor controlled series capacitor (TCSC), a novel TCSC control model is developed. In the model, the delay angle of thyristor valves is the input, and the inductor current is chosen as the output. Theoretical analysis and simulation studies show that TCSC is a non-linear system and its parameters vary with the operating point. In consideration of the special characteristics of the TCSC, an improved model algorithmic control (1MAC) scheme is proposed to control TCSC effectively. The good performance can be observed from simulation results when IMAC is applied to a series compensated radial system. 相似文献
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电-气比例/伺服控制系统的特性受到运行参数和负载干扰的较大影响,本文研究了该系统的自适应控制方法.根据电-气比例/伺服控制系统的技术特点,作者提出了采用模型参考自适应控制的策略,并解决了控制器设计、实现中的一系列技术问题.实验结果表明,本文的研究取得了显著的效果. 相似文献
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Ghazanfar Shahgholian Amir Movahedi Jawad Faiz 《International Journal of Control, Automation and Systems》2015,13(2):398-409
Thyristor controlled series capacitor (TCSC) can regulate line impedance and therefore increase transferred power of the system. On the other hand power system stabilizer (PSS) increases dynamic stability of generator. To enhance the stability, combination of TCSC and PSS can be applied, and in such a case coordination of TCSC and PSS is essential. This paper applies this combined controller in order to enhance the stability of multi-machine system. Parameters of these controllers are optimized by velocity update relaxation particle swarm optimization (VURPSO) algorithm and Genetic algorithm (GA). The simulation results show that the combination of VURPSO algorithm and GA leads to a better design and stability. 相似文献
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This paper proposes a perturbation estimation based coordinated adaptive passive control (PECAPC) of generators excitation system and thyristor-controlled series capacitor (TCSC) devices for complex, uncertain and interconnected multimachine power systems. Discussion begins with the PECAPC design, in which the combinatorial effect of system uncertainties, unmodelled dynamics and external disturbances is aggregated into a perturbation term, and estimated online by a perturbation observer (PO). PECAPC aims to achieve a coordinated adaptive control between the excitation controller (EC) and TCSC controller based on the nonlinearly functional estimate of the perturbation. In this control scheme an explicit control Lyapunov function (CLF) and the strict assumption of linearly parametric uncertainties made on system structures can be avoided. A decentralized stabilizing EC for each generator is firstly designed. Then a coordinated TCSC controller is developed to passivize the whole system, which improves system damping through reshaping the distributed energies in power systems. Case studies are carried out on a single machine infinite bus (SMIB) and a three-machine system, respectively. Simulation results show that the PECAPC-based EC and TCSC controller can coordinate each other to improve the power system stability, finally a hardware-in-the-loop (HIL) test is carried out to verify its implementation feasibility. 相似文献