基于Powersystems的双闭环直流调速控制系统的设计与仿真

双闭环直流调速系统结构经典、复杂,在研究和设计的过程中,若想取得预期的动态性能指标和静态性能指标组合,各参数的选择需要反复调试,直接硬件实验成本昂贵且安全风险系数高。文章通过使用Matlab软件中的Powersystems模块对直流调速双闭环系统进行仿真调试,实现了安全、方便、直观、经济和有效的控制系统设计目标。

基于多频段电力系统稳定器的电力系统暂态稳定性优化策略

针对风电场接入互联系统后产生的暂态稳定性问题,分析了低频振荡产生的原因,提出将多频段电力系统稳定器(multi-band power system stabilizer,MB-PSS)与静止无功补偿器(static var compensator,SVC)联合运行的控制策略,并对二者设置目标函数进行优化,从而提高系统运行的稳定性。将风电场接入IEEE两区域四机互联系统,在MATALB仿真平台对4种工况进行了仿真验证,结果表明所提策略在抑制区间低频振荡和稳定系统电压方面性能优越,能有效提高电力系统的暂态稳定性和电能质量。

企业级服务器实验平台整合优化研究

根据社会对大型机、Power Systems 人才需求的不断变化以及大型机技术的发展,以先进的IBM System z900 大型机、IBMPower systems 企业级服务器为核心,整合、优化企业级服务器实验平台,构建真实的企业应用环境,进一步改革、完善大型机实践教学内容,不断提高高校大型机、Power Systems 人才培养的质量和数量,促进学生就业和相关学科建设,逐渐解决大型机、Power Systems 人才市场供需矛盾、调整人才结构.

Robust H_∞ Load Frequency Control of Multi-area Power System With Time Delay:A Sliding Mode Control Approach

This paper is devoted to investigate the robust H∞sliding mode load frequency control(SMLFC) of multi-area power system with time delay. By taking into account stochastic disturbances induced by the integration of renewable energies,a new sliding surface function is constructed to guarantee the fast response and robust performance, then the sliding mode control law is designed to guarantee the reach ability of the sliding surface in a finite-time interval. The sufficient robust frequency stabilization result for multi-area power system with time delay is presented in terms of linear matrix inequalities(LMIs). Finally,a two-area power system is provided to illustrate the usefulness and effectiveness of the obtained results.

Simulation Studies of an Integrated Overcurrent Relay Protection Scheme for Distribution Systems

This paper presents an integrated protection technique for power distribution systems. A novel integrated protection scheme based on overcurrent protection technique for distribution system is described, in which a specially designed protection relay is installed at each substation of a network and responsible for the protection of every line sections connected to the substation busbar The conventional directional overcurrent and the new adaptive accelerated protection algorithms with multiple settings are implemented into the relay to cover all the protected line sections. The paper includes studies of a typical multi section distribution network to demonstrate the principle of the scheme. Studies show that the new scheme not only offer the new protection features for individual power line section, but also provide the characteristics of integrated protection.

An Improved Support Vector Clustering Approach to Dynamic Aggregation of Large Wind Farms

In this paper,we propose an improved support vector clustering(SVC)algorithm to cluster wind turbines(WTs)in a wind farm(WF).A boundary points(BPs)detecting method based on the grid theory and the connected subdomain(CS)are proposed.Thus the efficiency of SVC is enhanced while maintaining the accuracy of the algorithm.As for the multi-wind condition equivalent of WF,a method to determine the number and capacity of each of the aggregated wind turbines(AWTs)based on historical wind data is proposed.Only wind speed(WS)and wind direction(WD)of the WF are needed to calculate the WSs of each AWT.Results demonstrate that the algorithm proposed in this paper can cluster WTs quickly and accurately.And the dynamic aggregated models of the WFs are suitable for both the single-wind condition and multi-wind condition simulations,with high accuracy being obtained.