共查询到19条相似文献，搜索用时 140 毫秒
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对电力系统稳定器（PSS）的原理、作用等进行了详尽的介绍,通过MATLAB搭建单机无穷大仿真模型,分析了电力系统稳定器（PSS）对于系统故障后动态稳定性的影响,提出实际系统应投入PSS。 相似文献
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电力系统稳定器是抑制电力系统低频振荡的有效工具,但是其工作效果如何需要从全网稳定角度给出评价依据。本文采用小干扰稳定分析理论,基于电力系统公用数据平台,尝试开发了多级系统PSS参数校核软件模块。可为电力系统调度部门方便地提供校验审核PSS整定值的辅助方案。 相似文献
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机端自并励等励磁调节器的大量使用,使系统产生负阻尼,PSS是一种装置,它装在励磁调节器上,以转速偏差、功率偏差、频率偏差中的一种或两种信号作为附加控制,增加对系统的正阻尼从而抑制低频振荡减少对电力系统的影响 相似文献
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自21世纪以来,许多技术都在进行更新换代,特别是计算机技术。计算机技术在电力系统自动化中的应用也越来越广泛。这种融合顺应了这个时代的发展,而这个时代的发展也为计算机技术在电力系统自动化中提供了更多便利。计算机技术的应用使得电网调度更加安全、稳定,也提高了电网的运行效率。本文主要讲述计算机技术在电力系统自动化中的应用情况以及计算机技术在未来的电力系统自动化的应用分析。 相似文献
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开放式电网仿真系统(PSS)为电力系统专业学员提供了丰富的教学和培训手段。本文详细介绍了该系统的主要功能、特点及其在教学科研方面的应用。实际应用表明,该系统非常适合于进行教学、培训、学生实习、电力系统分析和反事故演习等等,是一个很好的教学实践软件。 相似文献
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随着对电网供电可靠性的不断提高,备用电源自投装置在电力系统得到普及。结合现场工作经验阐述备用电源自投装置的动作原理及对在现场应用中遇到的问题进行分析和探讨。 相似文献
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韩辉 《科技成果管理与研究》2010,(10):58-61
现在的工业传动领域,大量的变频调速系统取代了传统的传动系统,给电力电网带来了大量的谐波,造成了电力系统污染,存在极大危害。文章阐述了电力系统谐波的基本定义、产生原理、危害和常用抑制措施,并在此基础上对不同结构的变频调速系统的谐波情况进行了定性分析,介绍了适合变频调速系统的几种谐波抑制技术。 相似文献
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This paper deals with the simultaneous coordinated design of power system stabilizer (PSS) and the flexible ac transmission systems (FACTS) controller. The problem of guaranteed cost reliable control with regional pole constraint against actuator failures is investigated. The state feedback controllers are designed to guarantee the closed loop system satisfying the desired pole region, thus achieving satisfactory oscillation damping and settling time, and having the guaranteed cost performance simultaneously. The proposed controllers satisfy desired dynamic characteristics even in faults cases. The controller's parameters are obtained using the linear matrix inequalities (LMI) optimization. Simulation results validate the effectiveness of this approach. 相似文献
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《Journal of The Franklin Institute》2019,356(13):7183-7209
With the rapidly increasing penetration level of power generated by large scale photovoltaic (PV) units into the power systems, the effect of the variable output power of the PV unit on the stability of the system cannot be ignored. This paper presents a mathematical approach to study the effect of high infiltration of PV power plant on the small signal stability of a power network and design of optimal fractional order PID (PIλDμ) controller for improving the probabilistic small signal stability of the power systems, taking into consideration the uncertainty of system operating conditions. Due to the probabilistic characteristics of large scale PV power generation, deterministic analysis approaches are not able to fully reveal the impact of high-level PV penetration. At first, this work introduces the main module and mathematical modeling of the large scale PV generation jointly with the single-machine infinite-bus power system. In the following, the paper proposes an efficient method that tunes power system stabilizer (PSS) to have the robustness for damping electro-mechanical oscillations in power systems with incorporated random PV power. For this reason, a robust PSS based on hybridization of PIλDμ controller and Non-dominated Sorting Genetic Algorithm (NSGAII) is designed. This paper targets at finding the optimal gain scheduling of the PIλDμ through the use of the advanced heuristic optimization technique with two objective functions in PV-grid connected systems. The performance of the proposed NSGAII-based PIλDμ controller (NSGAII- PIλDμ) under different solar irradiation, temperature conditions and disturbances is tested. Simulation results illustrate that the model presented can be used in designing of essential controllers for large scale PV power plant. 相似文献
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根据国家电网公司"三集五大"体系建设的总体要求,在确保电网安全稳定运行的前提下,实现电网调度业务与运行监控业务的融合,强化电网运行管理,使电网集约化管理水平得到全面提升;文章论述了需要对电网调度运行和设备运行监控人员进行电网调度、设备监控业务的综合培训,达到适应调控一体化运作的需要。 相似文献
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采用单相电流型多电平变流器作为光伏并网发电系统的电路接口,可以降低开关器件的开关频率和电流应力,同时可以使电网侧电流获得更好的谐波特性。为获取更好的谐波性能,电流型多电平逆变器部分采用POD-PWM调制,并通过直流侧电流反馈实现分流电感电流的均衡控制。最后,通过锁相环控制,使多电平逆变器输出的电流跟踪电网电压,实现并网。基于PSIM仿真环境,设计了单相五电平电流型光伏并网逆变系统,对上述方案的正确性和可行性进行了验证。 相似文献
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In this paper, a model describing the castor three-dimensional dynamic behavior, is presented. A procedure, based on the Udwadia-Kalaba formulation has been implemented to write the castor non-linear motion equations. The model takes into account the flexural and lateral compliance of the castor frame and the phenomena related to the wheel rotation. To prescind from the wheel-road interaction parameters, the hypothesis of no sideslip of the wheel has been adopted but other tire models can be easily implemented. The non-linear system stability is evaluated integrating the motion equations and performing a fitting procedure on the natural steering oscillation. 相似文献
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针对阿坝州的特殊地理环境对电网建设的智能化要求,及通过对电力设施的管理和使用中所存在的问题,结合国家政策及电网未来发展趋势,提出了一种基于物联网技术的智能化电网设计.该设计能实时监测与控制电力设备的运行,并具有技术稳定性、远程监控及带来更大的经济效益等优势. 相似文献
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The optimal location of a static synchronous compensator (STATCOM) and its coordinated design with power system stabilizers (PSSs) for power system stability improvement are presented in this paper. First, the location of STATCOM to improve transient stability is formulated as an optimization problem and particle swarm optimization (PSO) is employed to search for its optimal location. Then, coordinated design problem of STATCOM-based controller with multiple PSS is formulated as an optimization problem and optimal controller parameters are obtained using PSO. A two-area test system is used to show the effectiveness of the proposed approach for determining the optimal location and controller parameters for power system stability improvement. The nonlinear simulation results show that optimally located STATCOM improves the transient stability and coordinated design of STATCOM-based controller and PSSs improve greatly the system damping. Finally, the coordinated design problem is extended to a four-machine two-area system and the results show that the inter-area and local modes of oscillations are well damped with the proposed PSO-optimized controllers. 相似文献
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Orthogonal frequency division multiplexing (OFDM) has been widely adopted in radar and communication systems. High sensitivity to carrier frequency offset (CFO) is one of the major drawbacks of OFDM. CFO estimation for OFDM systems had been extensively studied and various algorithms had been proposed. However, the established algorithms may be compromised by the adoption of direct-conversion architecture and multi-mode low noise amplifier in the OFDM receiver, which introduces time-varying direct current offset (TV-DCO) into the system. In our previous study, we developed an eigen-decomposition based estimation algorithm, which is robust to TV-DCO but suffers from performance degradation under low to medium signal-to-noise ratio and requires high computation efforts. To address those issues, we in this paper propose a novel blind CFO estimation algorithm. By making use of the second order differential filtering and subspace method, the proposed algorithm achieves great performance improvement with reduced complexity. The performance of the proposed algorithm is demonstrated by simulations. 相似文献