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“差异化”高效网优方法的系统性应用
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作者 林浩凌 林吉富 邢炎洲 《电信快报(网络与通信)》 2011年第11期28-32,共5页
"差异化"优化思路以实现高效网优为目标,是基于现阶段无线网优工作特点而提出来的创新性优化思路,在完成其优化探索并在现网取得良好实践效果的基础上,经进一步对其系统性应用进行深入研究并历经实践检验,从而总结出可操作性... "差异化"优化思路以实现高效网优为目标,是基于现阶段无线网优工作特点而提出来的创新性优化思路,在完成其优化探索并在现网取得良好实践效果的基础上,经进一步对其系统性应用进行深入研究并历经实践检验,从而总结出可操作性较高的系统性优化方法。文章将实践经验与相关理论体系进行了有机结合,并重在对实际问题的有效解决,对相关优化工作具有一定的借鉴意义。 展开更多
关键词 差异化优化 邻区优化 接入切换 功控参数 动态软切换
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Self-adapting Scalable Differential Evolution Algorithm
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作者 刘荣辉 郑建国 《Journal of Donghua University(English Edition)》 EI CAS 2011年第4期384-390,共7页
Differential evolution(DE) demonstrates good convergence performance,but it is difficult to choose trial vector generation strategies and associated control parameter values.An improved method,self-adapting scalable D... Differential evolution(DE) demonstrates good convergence performance,but it is difficult to choose trial vector generation strategies and associated control parameter values.An improved method,self-adapting scalable DE(SSDE) algorithm,is proposed.Trial vector generation strategies and crossover probability are respectively self-adapted by two operators in this algorithm.Meanwhile,to enhance the convergence rate,vectors selected randomly with the optimal fitness values are introduced to guide searching direction.Benchmark problems are used to verify this algorithm.Compared with other well-known DE algorithms,experiment results indicate that this algorithm is better than other DE algorithms in terms of convergence rate and quality of optimization. 展开更多
关键词 differential evolution (DE) SCALABLE self-adapting parameter control function optimization
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Stability Improvement of Power System by Using PI & PD Controller
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作者 Habibur Rahman Rafiqul Islam Sheikh Harun-Or-Rashid 《Computer Technology and Application》 2013年第2期111-118,共8页
This paper presents the model of a SVC (Static VAR Compensator) which is controlled externally by a PI (Proportional Integral) & PD (Proportional Differential) controllers for the improvements of voltage stabil... This paper presents the model of a SVC (Static VAR Compensator) which is controlled externally by a PI (Proportional Integral) & PD (Proportional Differential) controllers for the improvements of voltage stability and damping effect of an on line power system. Both controller parameters has been optimized by using Ziegler-Nichols close loop tuning method. Both single phase and three phase (L-L) faults have been considered in the research. In this paper, a power system network is considered which is simulated in the phasor simulation method & the network is simulated in four steps; without SVC, With SVC but no externally controlled, SVC with PI controller & SVC with PD controller. Simulation result shows that without SVC, the system parameters become unstable during faults. When SVC is imposed in the network, then system parameters become stable. Again, when SVC is controlled externally by PI & PD controllers, then system parameters becomes stable in faster way then without controller. It has been observed that the SVC ratings are only 50 MVA with controllers and 200 MVA without controllers. So, SVC with PI & PD controllers are more effective to enhance the voltage stability and increases power transmission capacity of a power system. The power system oscillations are also reduced with controllers in compared to that of without controllers. So with both controllers the system performance is greatly enhanced. 展开更多
关键词 SVC (Static VAR Compensator) PI (Proportional Integral) PD (Proportional Differential) Controller AVR TCR(Thyristor Controlled Reactor) voltage regulation MATLAB Simulink.
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