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由于频率的变化及品质因素的不确定性,很难准确计算变频谐振耐压装置的试验容量,以致出现准备工作不足、延长工作时间、电源及装置过载发热等问题。为此,归纳了有关公式,并提出经验参数,全面评估电源及装置容量,使变频谐振耐压装置试验容量输出的每个环节可控、在控。 相似文献
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基于区域极点配置的电力系统低频振荡均匀阻尼控制 总被引:1,自引:0,他引:1
提出了电力系统低频振荡的均匀阻尼控制方法.首先分析了电力系统的阻尼特性和实现均匀阻尼控制的条件;然后利用均匀阻尼思想,以系统振荡模式阻尼均匀为目标,提出利用区域极点配置方法设计发电机附加励磁控制器以实现低频振荡的均匀阻尼控制,由于同时配置多个极点到垂直条状区域中,所以避免了控制器对其他振荡模式阻尼的过度削弱,达到了多机系统的协调控制;最后以IEEE 4机11节点和新英格兰10机系统为例,并与精确极点配置法进行比较.仿真结果说明了此控制方法的有效性和鲁棒性,为电力系统低频振荡的抑制提供了新思路. 相似文献
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通过阐述串联谐振电路的基本原理,介绍了该电路在电气设备高压试验中的具体试验方法及特点,通过多种电气设备的耐压试验表明了该电路应用的广泛性。 相似文献
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论述了如何通过调整电抗器的感抗值,使串联谐振装置在进行工频耐压时,将试验频率控制在50HZ附近。将理论和实际经验相结合,给出了计算实例,对现场的试验工作有一定的指导作用。 相似文献
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根据相间功率控制器(IPC)和电压源型变换器(VSC)的基本原理、工作特性,将二者结合构成移相环节连续可调的动态可控相间功率控制器(DCIPC)。通过参考电压值对VSC进行调节,进而改变电感和电容支路的注入电压,达到快速连续地改变IPC各支路移相角的目的。分析移相角控制对带DCIPC联络线传输功率的调节作用,以发电机角速度变化作为反馈控制信号设定VSC产生的移相电压,从而实现抑制功率振荡的功能。该控制器电感支路由晶闸管控制电抗器(TCR)代替,电容支路由晶闸管控制串联电容器(TCSC)容性微调模式构成,分析TCR支路感抗和TCSC支路容抗对短路电流的限制作用,以晶闸管触发角作为控制信号设定DCIPC的等值参数,从而实现限制短路电流的功能。以经带DCIPC联络线相连的两机系统为例,验证了所提方法的有效性。 相似文献
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针对远距离大容量输电系统中出现的多机系统次同步振荡(SSO),分析了利用STATCOM附加电流的抑制策略,采用了模态解耦控制方法,详细介绍了控制器参数整定过程.在此基础上,建立了网络中各元件的端口等效导纳矩阵.采用分散消元的复转矩系数法,可以简化全系统复频域网络方程的生成,便于分析发电机组的等效电气阻尼特性.最后以此方... 相似文献
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在电力系统的电磁暂态数字仿真中,非线性元件的非线性特性将导致数值计算中产生数值振荡.引入一种新的离散方法一改进的节点分析法,对非线性元件进行处理,离散化得到等效伴随电路,然后求解.通过Matlab软件仿真得到等效后的电压波形,与ATP和PSCAD模型比较,所提算法可以有效消除数值振荡,并不会出现"毛刺"现象,适合非线性元件的仿真. 相似文献
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韩庆田 《国外电子测量技术》2014,(4):64-67
针对投放装置多部件信号关联问题,采用电路模拟仿真方法设计了编码电路,通过产生模拟信号实现了装置全功能测试试验,解决了不连接关联部件时的单一部件测试问题;采用时序逻辑和微处理技术,设计了计时电路、电源控制电路和波段开关电路,解决了测试信号的时序控制问题;采用信号高速处理与逻辑解码技术,解决了脉冲信号与时间指令的同步问题,实现了多路时间脉冲信号的实时精确显示,以及功能测试与故障定位的统一。功能测试结果表明,试验器测试指标符合设计要求,信号稳定。 相似文献
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航空发动机转速传感器调理电路设计与仿真 总被引:1,自引:0,他引:1
在航空发动机数控系统中,转速传感器所测得的转子转速信号往往不能直接被电子控制器所接收,需要进行信号的调理.本文依据航空发动机转速传感器的测量原理,并结合航空发动机的特殊要求,设计了一种磁电式转速传感器的信号调理电路,并利用一种最新款的电路仿真软件PROTEL DXP对其进行了仿真.该仿真方法简单方便,用户界面友好,易于操作实现,同时也节约了设计成本.仿真结果表明,所设计的电路能满足航空发动机转速信号调理的要求,精度高,有较高的实用价值. 相似文献
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N. MagajiAuthor Vitae M.W. Mustafa Author Vitae 《International Journal of Electrical Power & Energy Systems》2011,33(4):1031-1042
Unified power flow controller (UPFC) is used for controlling the real and reactive power in transmission line and bus voltage simultaneously and independently. An additional task of UPFC is to increase transmission capacity as result of power oscillation damping. The effectiveness of this controller depends on its optimal location and proper signal selection in the power system network. A residue factor has been proposed to find the optimal location of the UPFC controllers and eigenvalue analyses are used to assess the most appropriate input signals (stabilizing signal) for supplementary damping control of UPFC to damp out the inter-area mode of oscillations. The proposed residue factor is based on the relative participation of the parameters of UPFC controller to the critical mode. A simple approach of computing the residue factor has been proposed, which combines the linearized differential algebraic equation model of the power system and the UPFC output equations. While for signal selection a right-half plane zeros (RHP zeros) and Hankel singular value (HSV) is used as tools to select the most receptive signal to a mode of the inter-area oscillation. The placements of UPFC controllers have been obtained for the base case and for the dynamic critical contingences. The effectiveness of the proposed method of placement and selection of signals are demonstrated on practical network of TNB 25 bus system of south Malaysian network and New England 39 bus system. 相似文献
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Fixed-order controller for reduced-order model for damping of power oscillation in wide area network
The interconnected power systems are complex and stabilizing control design still remains challenging task. The use of wide area monitoring system (WAMS) offers an integrated measurement-based and model-based control, which suits to the operation of large electric power system (EPS), along with online analysis. This paper presents a study on fixed-order controller design for equivalent network of coherent generator in order to stabilize inter-area electromechanical oscillations in the system. Firstly, the coherent generators in each area of large EPS are determined by mutual information theory, which represents the dynamic equivalence. Then network of each area with input–output variables of the selected generator that participates dominantly is reduced to lower size by square-root variant of balanced truncation algorithm. The dynamics and important oscillation modes are verified in equivalent representation of each area. Finally a local controller (decentralized) in each coherent area and a centralized controller between two coherent areas for selected generator are designed by reducing the H∞ norm of its closed loop transfer function as much as possible. These controllers feed supplementary control signal in addition to one fed by local conventionally tuned PSS. The decentralized controller for selected generator is fed by local bus power or generator’s speed signal. On other hand, the centralized controller uses difference of power flow/speed of generators as input signal to dampen the oscillations between equivalent networks of two areas. The simulation results reveal effective damping of power/speed oscillations achieved by designed controller with respect to conventional PSS implemented. The robustness of controller is verified for heavy and light load operating conditions. 相似文献