自主型300MW循环流化床机组协调控制优化

介绍自主型300MW循环流化床机组协调控制策略,在使用AGC功能时经常因主汽压力过高或偏差大而退出,不能满足AGC的考核要求,对其在运行中存在的问题进行分析,通过在锅炉主控中的使用基于自整定的PID增益调度控制器,修正汽机主控的“压力拉回”功能的参数和增加煤质热量校正回路,使机组负荷控制指标满足南方电网AGC功能的要求.     

菏泽电厂#3机组AGC控制策略优化

锅炉主控、汽机主控控制策略简单、磨热一次风门线性度差且故障多,不能满足菏泽电厂#3机组AGC运行要求。通过对其机组运行特点进行深入的研究,设计了一套关于双进双出钢球磨燃料量控制的新方案,提出了一套与AGC运行方式相适应的协调控制策略。实现了机组AGC的投入,提高了AGC的控制品质,并降低了一次风机电耗量。     

600MW机组CCS及AGC逻辑优化与应用

某发电公司装机为4×600MW亚临界燃煤发电机组,于2006~2008年相继投产,机组投产后AGC功能未经过调试和实际应用。现因机组在完成低氮燃烧器和脱硝系统改造及机组调峰调频并入河北省电网的调度管理,自动发电控制功能(AGC)和一次调频功能需要适应河北电监会"两个细则"的严格要求。机组的协调控制需要进行重新优化,使机组尽快响应调度的负荷变化要求,满足《火力发电厂模拟量控制在线验收测试规程》及其它相关规程规定的要求。     

火电机组基于区域控制偏差(ACE)模式协调优化

本文针对山西某火电机组在区域控制偏差(ACE)模式下负荷频繁变动造成的自动发电控制(AGC)考核指标差、主蒸汽压力偏差大等实际问题,结合AGC考核指标算法,提出了机组负荷指令超前控制、变负荷速率校正回路、锅炉滑压设定预测控制、锅炉主控前馈自适应控制、一次调频优先控制、汽轮机调阀流量优化等策略,实际应用后大幅度提升了机组AGC考核指标.     

基于IMC-PID的超临界火电机组AGC性能优化北大核心CSCD

自动发电控制(AGC)功能要求火电机组的负荷响应具有较快的速度和较高的控制精度。常规的AGC采用基于PID的前馈-反馈控制策略,当电网AGC模式改变时,常规AGC策略的性能可能发生恶化乃至引起考核。为了全面优化火电机组的AGC性能,设计了一种基于内模控制PID(IMC-PID)的前馈-反馈功率控制回路,通过构建调节级压力-负荷的传递函数引入内模,在考虑分散控制系统离散控制特性和发电机响应特性的基础上实现控制回路参数整定。最后,将该策略应用在某660 MW超临界机组,结果表明机组AGC性能得到显著提升。     

300MW循环流化床主汽压波动大的分析和解决方案

针对300MW循环流化床加减负荷等情况时主汽压波动大导致AGC和协调退出的问题,仔细分析了循环流化床的运行特性和锅炉主控系统的控制逻辑,提出了切实可行的逻辑优化方案,使主汽压力在正常范围内变化,保证了机组的安全稳定运行。     

某火电厂厂级AGC改造

本文从六个方面分析单机AGC存在的问题,指出该方式增加了电厂的整体煤耗、电耗,影响机组的经济性和安全性;阐述厂级AGC原理、系统结构及主要功能,厂级AGC能根据各台机组的煤耗率、响应速率、调节范围、运行工况等,自动合理地进行全厂机组最优化负荷分配,有效降低发电成本,促进机组高效、经济运行;所以进行厂级AGC改造非常必要。从负荷上升、下降、稳定三种情况讲解厂级AGC的分配策略,提出厂级AGC改造必须坚持的原则;对改造后的运行方式进行总结,从单机指令跳变、单机指令为零、自动退出厂级AGC三种现象进行原因分析并提出解决办法,对厂级AGC负荷安排作出要求,通过优化机组带负荷的运行方式,提高机组经济性,最后介绍了改造后的运行效果,对发电企业多台机组的厂级AGC改造有较强的指导意义。     

孤岛智能配电网下的快速自动发电控制机组一致性协同控制算法

由于可再生能源随机性、间歇性的特征和智能电网"即插即用"的要求,传统的集中式AGC控制方法面临诸多挑战,分布自治与集中协调已成为智能配电网的未来发展方向.为此,本文提出了一种基于等微增率的AGC机组一致性协同控制算法,解决了孤岛智能配电网的频率自治与协同控制问题;并提出了一种"虚拟一致性变量"的概念,用于解决AGC机组功率越限导致的拓扑变化问题和实现AGC机组的"即插即用";同时,在智能配电网发生负荷扰动的情况下,为保证所有机组在新的工况下仍能达到最优经济运行,建立了AGC功率分配与短期经济调度的协同目标.最后搭建了包含多种分布式电源及多个微网的智能配电网模型,仿真表明:与传统集中控制方法相比,一致性协同算法动态优化速度快,收敛鲁棒性强,能有效解决孤岛智能配电网的频率自治与协同控制问题.     

MW级风电机组主控系统PLC需求研究

为找到MW级风电机组主控系统PLC所需满足的统一基本需求,在对国内外风电主控PLC主要厂商进行调研了解和对比分析后,对风机运行的大脑——以PLC为核心控制器的主控系统进行了需求分析的研究.通过对不同的PLC控制器产品手册、风电机组主控改造项目文件、与MW级风电机组主控系统设计与实现相关的文献资料和PLC控制器产品需求规...     

超超临界机组AGC控制技术的研究与应用

电网的频率反映了发电有功功率和负荷之间的平衡关系,是电力系统运行的重要控制参数,AGC控制是解决电网频率波动的最有效途径之一.以华能海门电厂为例介绍了AGC功能在1000 MW超超临界机组上实际投运的效果,并对AGC功能投运的基础协调控制系统作了分析.     

Distributed Consensus‐Based Optimization of Multiple Load Aggregators for Secondary Frequency Control

Responsive loads can act as spinning reserve which is incorporated with the conventional AGC units for the improvement of frequency reliability. In this paper, a distributed consensus‐based optimal strategy of responsive load aggregators and AGC units is presented to provide secondary frequency control in the power system. Specifically, two‐step optimal model is proposed. In the first step, Lambda‐Iteration method is used to yield the total active power command for load group and AGC group. In the second step, the distributed optimal algorithm with θ‐logarithmic barrier cost function is proposed to allocate the active power command to multiple load aggregators and AGC units while guaranteeing consensus among individual incremental costs. In achievement of such a consensus, two virtual pinners are utilized to generate the regulation signal only shared with a part of load aggregators and AGC units, respectively. Moreover, the communication topology among load aggregators is a strongly connected digraph, the same as to the AGC units. Finally, simulation results show that the system frequency can be greatly improved, while the total cost of the whole system can be minimized with both equality and inequality constraints.     

Multi area AGC scheme using imperialist competition algorithm in restructured power system

This paper is focused on optimization based design methodology and application of PID controller in restructured, competitive electricity market environment, for AGC problem. The paper compares two search algorithms for designing of PID controller used for AGC in multiarea power system. The optimal parameters of PID controller have been determined with the use of Imperialist Competitive Algorithm (ICA). A deregulated scenario has been considered to develop the model of the multiarea AGC scheme. This paper presents that the ICA tuned PID (ICA-PID) controller can optimally regulate the generators output and can provide the best dynamic response of frequency and tie-line power on a load perturbation. The performance of proposed controller has been checked on 2-area thermal power system and 3-area thermal-hydro power system with the consideration of generation rate constraint (GRC). The results obtained by ICA-PID controller and genetic algorithm tuned (GA-PID) controller have been compared on the basis of performance parameters (settling time and oscillations). It is seen that ICA-PID controller shows the better performance as compared to GA-PID controller.     

兆瓦级直驱式风力发电机组控制系统设计

为了降低系统控制难度、提高机组转化效率,提出了一种以复合励磁同步发电机作为发电机的兆瓦级直驱式复合励磁同步风力发电系统,该系统由不可控二极管 直流环节 并联SPWM逆变器组成的交/直/交变流器将风能转化为电能送入电网.该机组控制系统由机组主控制器、复合励磁控制器、逆变器控制单元、变桨距机构、偏航机构等构成.对机组控制系统中各个部件的功能和结构进行了分析和设计,并通过Profibus现场总线将这些部件构成了一个集散控制系统.     

基于DSP的混合动力公交车整车控制器系统设计

本文基于DSP设计了串联式混合动力公交车的动力总成控制器,在建立需求分析的基础上,制定了基于串联式混合动力公交车的控制策略,并以此为根据,设计了动力总成控制器的硬件方案和软件方案,经实践证明该设计满足电动车公交车的性能要求。     

基于CompactRIO的激光电源远程监控

针对目前大功率激光电源实时监测难度大的问题,设计了基于CompactRIO实时控制器的大功率激光电源远程监控系统.以LabVIEW实验室虚拟仪器集成环境为开发平台,由PC客户端和实时(RT)控制器端组成,实时控制器端将激光电源的实时状况经过以太网实时打包传送给远程监控端,远程控制端则将所收到的信息解包并显示在监控界面上,监控系统即可对激光电源的各项参数实现远程可视化监控.经反复测试,结果表明:系统运行稳定,满足监控要求.在远端的工作人员不用亲临现场,通过远端的控制端可以实时了解激光电源的工作状况,达到了对激光电源的远程监控的目的.     

鱼群优化下的BP网络在冷轧控制中的应用

在轧机液压AGC系统及其运行机理的基础上,建立了电液位置控制系统数学模型。通过FB Generater、C语言等对优化后的网络进行编写封装,得到了基于改进人工鱼群算法优化的神经网络智能控制器,创建了基于神经网络智能算法的CFC(连续功能图)块,并在西门子FM458平台下对电液系统模型进行控制实验。实验结果表明,人工鱼群算法优化后的神经网络控制器能够准确、快捷的达到控制要求,此方法应用于冷轧AGC控制行之有效。     

一类非自衡对象的PID控制

本文讨论非自衡对象PID控制器设计问题.首先在鲁棒控制理论的基础上定义了 最优性能指标,然后针对控制系统性能传递函数的特点发展了两种设计方法,通过引入2型滤 波器使系统满足了渐近跟踪的要求,并解析地得到了PID控制器.控制器的特点是标称性能 可以定量地估计,鲁棒性可以方便地调节.     

基于Net BIOS的工作站网点通信

基于ＮｅｔＢＩＯＳ环境，首先阐述了ＮｅｔＢＩＯＳ功能调用方法，然后论述了工作站网点之间通信程序的编程技术，给出了用Ｃ语言编写的在工作站点间进行文件传送的详细应用程序，为在Ｎｏｖｅｌ网络工作站点间的实时通信奠定了基础。     

Design of adaptive robust guaranteed cost controller for wind power generator

According to the increasing requirement of the wind energy utilization and the dynamic stability in the variable speed variable pitch wind power generation system, a linear parameter varying (LPV) system model is established and a new adaptive robust guaranteed cost controller (AGCC) is proposed in this paper. First, the uncertain parameters of the system are estimated by using the adaptive method, then the estimated uncertain parameters and robust guaranteed cost control method are used to design a state feedback controller. The controller’s feedback gain is obtained by solving a set of linear matrix inequality (LMI) constraints, such that the controller can meet a quadratic performance evaluation criterion. The simulation results show that we can realize the goal of maximum wind energy capture in low wind speed by the optimal torque control and constant power control in high wind speed by variable pitch control with good dynamic characteristics, robustness and the ability of suppressing disturbance.     

A Novel Cascaded PID Controller for Automatic Generation Control Analysis With Renewable Sources

Present day power scenarios demand a high quality uninterrupted power supply and needs environmental issues to be addressed. Both concerns can be dealt with by the introduction of the renewable sources to the existing power system. Thus, automatic generation control (AGC) with diverse renewable sources and a modified-cascaded controller are presented in the paper. Also, a new hybrid scheme of the improved teaching learning based optimization-differential evolution (hITLBO-DE) algorithm is applied for providing optimization of controller parameters. A study of the system with a technique such as TLBO applied to a proportional integral derivative (PID), integral double derivative (IDD) and PIDD is compared to hITLBO-DE tuned cascaded controller with dynamic load change.The suggested methodology has been extensively applied to a 2-area system with a diverse source power system with various operation time non-linearities such as dead-band of, generation rate constraint and reheat thermal units. The multi-area system with reheat thermal plants, hydel plants and a unit of a wind-diesel combination is tested with the cascaded controller scheme with a different controller setting for each area. The variation of the load is taken within 1% to 5% of the connected load and robustness analysis is shown by modifying essential factors simultaneously by ± 30%. Finally, the proposed scheme of controller and optimization technique is also tested with a 5-equal area thermal system with non-linearities. The simulation results demonstrate the superiority of the proposed controller and algorithm under a dynamically changing load.