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In this study, voltage, active power and reactive power variation of load bus were examined by Flexible AC Transmission Systems devices (FACTS) in grid-connected wind farm. In the system, FACTS devices, Static Synchronous Compensators (STATCOM), Static VAr Compensators (SVC), Static Synchronous Series Compensators (SSSC) and Thyristor Controlled Series Compensators (TCSC), were used. Also, dual feed induction generator (DFIG) was used as generator in the wind farm. This simulation study was done via Matlab/Simulink environment. According to different values of active and reactive loads at different times being attached to the system, shapes of load bus voltage, active power and reactive power variation were given, also the results were presented in tables. In the conclusion of this study, by means of FACTS devices that is used in the wind farm, instability was healed within a short time. 相似文献
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本文提出了一种应用神经网络控制策略为静止同步串联补偿器(SSSC)设计的新型潮流控制器。径向基函数神经网络的理论基础是函数逼近,用一个两层的前向网络去逼近任意函数,以更好地进行潮流控制。仿真结果表明,这种控制器与传统的PI调节控制相比,不但能快速调节潮流,增加系统阻尼,改善系统稳定性,并且有较强的适应性、鲁棒性。 相似文献
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This paper examines the influence of Static Synchronous Series Compensator (SSSC) and STATic synchronous COMpensator (STATCOM) on the synchronizing power and damping power of a single-machine infinite bus system. The main function of SSSC is to compensate for the voltage drop across the impedance transmission line while the STATCOM provides voltage support at the point of connection at the transmission line. Beside their main function, SSSC and STATCOM can also be used to improve the synchronizing power and damping power, which in turns improve the small signal stability of power systems and thus more power can be transmitted. The SSSC has two modes of operation: (1) constant reactance mode and (2) constant quadrature voltage mode. It was shown that SSSC provides higher synchronizing and damping powers when operated in constant reactance mode than constant quadrature voltage mode. Comparing SSSC with STATCOM, the SSSC, in constant reactance mode, has been found to provide higher synchronizing and damping powers than the STATCOM. However, the STATCOM provides higher synchronizing and damping power than the SSSC when it operates on constant quadrature voltage mode. 相似文献
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This paper presents the performance evaluation of power oscillation damping controller based on firefly algorithm (FA) parameter tuning. The power system stabilizer (PSS), unified power flow controller (UPFC), and static synchronous series compensator (SSSC) are tuned with FA by minimizing integral time multiplied by absolute error (ITAE) as an objective function. An integrated multi-stage linear quadratic regulator – power oscillation damping UPFC/SSSC has been proposed with precise tuning of control parameters which results in overall states' oscillation damping as compared to other classical methods. It has been observed that the proposed control structure damps the oscillations adequately and is modular in design methodology. The sample power system comprising six areas has been considered to demonstrate the effectiveness of the concept. The software has been developed based on the proposed work by the authors and the MATLAB code has been generated in R2009b version. The states' inter-relation which has been shown with eigenvalues reflects a better regulation and the step response is also validated. 相似文献
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In this paper, a hybrid Improved Differential Evolution and Pattern Search (hIDEPS) approach is proposed for the design of a PI-Type Multi-Input Single Output (MISO) Static Synchronous Series Compensator (SSSC) based damping controller. The improvement in Differential Evolution (DE) algorithm is introduced by a simple but effective scheme of changing two of its most important control parameters i.e. step size and crossover probability with an objective of achieving improved performance. Pattern Search (PS) is subsequently employed to fine tune the best solution provided by modified DE algorithm. The superiority of a proposed hIDEPS technique over DE and improved DE has also been demonstrated. At the outset, this concept is applied to a SSSC connected in a Single Machine Infinite Bus (SMIB) power system and then extended to a multi-machine power system. To show the effectiveness and robustness of the proposed design approach, simulation results are presented and compared with DE and Particle Swarm Optimization (PSO) optimized Single Input Single Output (SISO) SSSC based damping controllers. It is observed that the proposed approach yield superior damping performance compared to some approaches available in the literature. 相似文献
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本文针对基于功率传递的电网间同期并列装置转换为静止同步串联补偿器的复合系统,建立了并网装置转换为SSSC后的等效模型,根据SSSC既可进行容性补偿又可进行感性补偿的双重补偿的特点,分析了SSSC调节潮流的过程以及接入SSSC前后输电线路电流的变化情况。为减小短路故障情况下短路电流对系统的影响,本文利用SSSC可等效为感性阻抗的特点对不同短路故障电流进行了限制,从而提高了现有设备的综合利用率。在PSCAD/EMTDC中搭建了含SSSC的等效模型,仿真结果表明SSSC可有效调节线路输送的潮流,并验证了当系统发生短路故障时SSSC具有一定的限流功能。 相似文献