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Search Results: 1 - 10 of 12758 matches for " 段盼 "
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发电系统可靠性随负荷率变化规律研究
Study on the Power System Reliability Variation with Load Rate
 [PDF]


Smart Grid (SG) , 2014, DOI: 10.12677/SG.2014.46034
Abstract:
基于削峰填谷和等比例调整等负荷率调整策略,提出调整策略对应的负荷调整算法;基于此,建立系统可靠性指标随系统负荷率变化的样条插值模型。两种负荷率调整策略均针对给定时段(如一年或一天)内,在满足负荷电能需求下,调整负荷谷峰差及负荷曲线,即在系统平均负荷不变的前提下改变系统最大负荷及其他时段负荷,以达到提高负荷率的目的。应用IEEE-RTS 79系统验证了模型的有效性。算例表明:随着系统负荷率的提高,系统可靠性呈非线性上升规律,即提高系统负荷率可提高系统可靠性;但是,当负荷率提高到一定程度时,系统可靠性的提高会出现明显的饱和现象。
Load rate adjustment strategies based on reducing peak and filling valley and the proportion of load shifting are presented, and the algorithm for the load adjustment is also presented. The rela-tionship between the system reliability and the load rate is modeled using the spline interpolation method. Both the two load rate adjustment strategies can adjust the peak-valley difference and the load curve satisfying load demand in a given period of time; that is, the maximum load and the load in other times of the system are changed with the same average load in order to improve load rate. The validity of the model is verified using the IEEE-RTS 79 system. Results indicate that with the increase of the system load rate, the system reliability increases in a non-linear way, which also means the reliability performance of the system can be improved by increasing the system load rate; however, when the loading rate increases to a certain extent, saturation will arise in the sys-tem reliability.
发输电组合系统可靠性随系统负荷变化的规律研究
Study on the Reliability Variation of Generation and Transmission System with Load Rate
 [PDF]


Smart Grid (SG) , 2014, DOI: 10.12677/SG.2014.46033
Abstract:
本文分析了发输电组合系统主要可靠性指标,如:LOLP、LOLF和EENS,随系统负荷的变化规律,以拟合的规律曲线连续、光滑等为目标,建立系统可靠性指标随系统负荷变化的三次样条插值模型。通过插值边界条件、插值点导数等信息,即可求解该模型。结合该模型,可建立电力系统可靠性预测估计模型,以避免负荷变化时可靠性的重复评估。将该模型应用于RBTS测试系统。算例表明:系统可靠性随负荷呈非线性的变化规律;当负荷变化时,可直接应用该模型预测估计系统可靠性,其平均绝对百分误差约2.0%。
The rules between the reliability indices of generation and transmission system, such as: LOLP (loss of load probability), LOLF (loss of load frequency), EENS (expected energy not supplied), and the system load are analyzed. The relationship model between the power system reliability and system load rate is modeled using cubic spline interpolation, and the model can be solved according to the interpolation boundary conditions, the interpolation points and derivative information. Therefore, a fast evaluation technique based on the proposed model for the reliability of power systems can be obtained, which can avoid the duplication of reliability evaluation with multi-load levels. The proposed model is applied to the RBTS system. Results indicate that the relationship between the system reliability and load rate is non-linear variation. The average error for the evaluation on the reliability in these cases is about 2.0% when the load changes.
带扩展记忆的粒子群优化算法仿真分析
其昌,黄大伟,雷蕾,
控制与决策 , 2011,
Abstract: 从心理学的角度提出带扩展记忆的粒子群优化算法(PSOEM),以克服标准粒子群优化算法(PSO)在优化多维函数过程中粒子搜索方向性差、目的性弱的缺陷.采用扩展记忆存储粒子的历史信息,并引入参数表征扩展记忆的重要性.利用经典离散控制理论分析其定值算法的稳定范围.此算法与标准算法是同源异构的,可以与已改进的PSO算法结合使用.基准测试函数的仿真结果验证了所提出算法的有效性.
汽油发电机转速前馈-反馈控制系统
其昌,,董平,林森,程伟
控制理论与应用 , 2011,
Abstract: 汽油机的转速稳定性是影响汽油发电机电气性能指标的一个重要因素,本文在分析其工作原理的基础上提出了一种电流前馈、转速负反馈式的系统结构,并且把反馈控制器设计为模糊控制、PID控制和保持模态相结合的多模态控制器.利用MATLAB工具进行的仿真和实际配机试验结果都表明,采用此算法后该转速控制系统的稳态性能和动态切换性能都比采用常规PID控制时有明显改善,证实了所提方法的有效性.
含2-氨甲基苯并咪唑铜(Ⅱ)配合物的合成、表征、抑菌活性及与DNA作用的研究
王璐,冉冉,,周晓华
华南农业大学学报 , 2014, DOI: 10.7671/j.issn.1001-411X.2014.02.017
Abstract: 【目的】为了设计和寻找DNA的特异性识别剂和断裂剂,合成了2-氨甲基苯并咪唑铜(Ⅱ)配合物:[Cu(AMB)2Cl]Cl·4H2O(配合物1)和[Cu(AMB)(phen)Cl]Cl·2H2O(配合物2)(AMB=2-氨甲基苯并咪唑,phen=1,10-邻菲咯啉).【方法】通过元素分析、IR、UV和摩尔电导率对配合物进行了表征.用二倍稀释法测试了配合物对大肠埃希菌Escherichiacoil(G-)、沙门杆菌Salmonellatyphi(G-)、金黄色葡萄球菌Staphylococcusaureus(G+)和枯草芽孢杆菌Bacillussubtilis(G+)的最小抑菌浓度(MIC).采用电子吸收光谱、荧光光谱、相对黏度及琼脂糖凝胶电泳法测试了2个配合物与ct-DNA的结合作用.【结果和结论】配合物1以非插入方式、配合物2以插入方式与ct-DNA作用;在VC存在下,2个配合物均通过·OH氧化机理切割pBR322DNA.2个配合物结合ct-DNA和切割pBR322DNA的能力强弱均为:配合物2>配合物1.
含风电场的电力系统电压控制分区方法
乔梁,卢继平,黄蕙,蒋望,,韩涛,张浩
电网技术 , 2010,
Abstract: 将风电出力概率分布离散化为多个场景,选取其最具有代表性的期望场景,在基于无功源控制空间的基本思想的基础上,求得该场景对应的全维电压/无功灵敏度矩阵,采用基于传递闭包的模糊聚类方法,得到一种含风电场的电网电压控制分区方法。该方法采用概率的方法将风电场出力变化纳入分区算法中,合理地解决风机出力的随机性与系统运行要求尽量稳定的矛盾;并考虑了风电场电源与系统各节点之间的相互影响,能够一次性对整个系统各节点分区,优于以往算法或多或少需要人工介入部分节点归类的弊端,为实现在线实时分区提供了条件。
铁磁谐振过电压柔性控制的试验研究
杨鸣,司马文霞,,杨庆,袁涛,张耘溢
高电压技术 , 2015, DOI: 10.13336/j.1003-6520.hve.2015.02.043
Abstract: 为了控制不同类型的铁磁谐振过电压,通过向量分析方法详细分析了铁磁谐振过压的产生及控制机理,并基于此提出了一种采用全控高速电力电子开关的铁磁谐振过电压柔性控制方法。搭建了铁磁谐振柔性控制试验平台,基于该平台得到了几种电力系统典型的铁磁谐振过电压,并对这几种典型铁磁谐振过电压进行了柔性控制试验研究。结果表明提出的铁磁谐振柔性控制方法能够在0.12s内将电力系统中常见的基频、分频和高频铁磁谐振过电压控制至正常水平,且控制后的电压谐波满足IEEE519—1992标准。该方法简单有效,具有现场实际运用的潜力。
F-P腔锁频压窄窄线宽激光器输出波长精度测试
,郑永秋,李小枫,张建辉,美玲,薛晨阳,闫树斌
红外与激光工程 , 2014,
Abstract: 基于谐振式光纤陀螺系统要求窄线宽、高稳定性激光输出以满足谐振信号频差检测要求,设计了两种不同光路锁频系统并搭建了测试平台,利用波长计实时监控窄线宽激光器锁频前后两种状态下波长的变化情况。对方案二设置两种不同的仪器锁频参数,分别对激光器输出波长的锁频精度进行监控分析,得到不同设置参数可导致锁频精度降低1倍。两种方案测试结果均为锁频后的激光波长变化幅度仅为锁频前的0.2倍,且曲线频率变化光滑平缓,很大程度地压窄了窄线宽激光器输出波长变化幅度,波长变化稳定性得到了很大改善,提高了锁定信息反馈的实时性。进一步实施窄线宽激光谱线的压窄以及PI电路对窄线宽激光频率的有效快速跟踪锁定提供技术支撑。
Feedforward-feedback speed control system of gasoline generator
汽油发电机转速前馈-反馈控制系统

DUAN Qi-chang,DUAN Pan,DONG Ping,LIN Sen and,
其昌
,,董平,林森,程伟

控制理论与应用 , 2011,
Abstract: The speed stability of a gasoline generator is an important factor that affects its electrical performances. To tackle this problem, we propose a control system consisting of current feedforward and speed feedback in a closed-loop. The feedback controller is a multimodal controller composed of the fuzzy control, PID and maintain mode. Simulation of speed control is implemented by MATLAB, and the experimental results show that the present controller has superior characteristics in the static and dynamic performances of speed stabilization, in the comparison with the traditional PID scheme. It is ef cient in speed regulation for gasoline generator.
Improved adaptive integral control algorithm for nonlinear system
非线性系统的改进型自适应积分控制算法

DUAN Qi-chang,ZENG Yong,DUAN Pan,LEI Lei,
其昌
,曾勇,,雷蕾a

计算机应用研究 , 2010,
Abstract: For the conventional integral control for nonlinear systems, designed an improved adaptive integral control method to reduce the steady-state tracking error and prevent integral saturation. The method used feedback linearization to eliminate nonlinearity, and adjusted the proportional factor and integral factor corresponding to the error by introducing penalty functions, then could avoid the large overshoots due to the large initial errors. By using the Lyapunov synthesis approach, it is proved that the closed-loop system is uniformly ultimately bounded in the presence of bounded disturbance force. Theoretical analysis on the stability of the closed-loop system and simulation results show the feasibility of the proposed scheme.
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