共查询到20条相似文献,搜索用时 843 毫秒
1.
杨开林 《水电自动化与大坝监测》1983,7(6)
本文介绍了单输入控制系统误差函数为零阶系统时的二次性能指标损失函数的求解方法。在此基础上,推导出误差函数为一阶系统时二次性能指标损失函数的解析表达式。导出了装置PID型调整器和转桨式水力发电机组带孤立负荷运行,投入电网运行时含有22个影响调节品质的有关参数的损失函数解析表达式,以及理想PI型调速器和混流式水力发电机组控制系统调节参数最优整定值的解析表达式。根据水力发电机组控制的特点和电力系统对控制的性能要求,提出的确定水力发电机组控制系统实际调节参数最优整定值的方法,即改进二次性能指标法,对发展最优控制理论应用于水力发电机组的控制具有实用价值。 相似文献
2.
3.
4.
5.
针对抽水蓄能机组调节系统PID控制器参数整定困难问题,提出了一种基于改进天牛须搜索算法的抽水蓄能机组PID控制策略。首先,构建了小波动情况下带有时滞的抽水蓄能机组调节系统的数学模型。其次,提出了一种融合自适应分数阶微积分与自适应更新步长的改进天牛须搜索算法。然后,采用改进天牛须搜索算法、天牛须搜索算法与粒子群算法,分别设计调节系统在空载与负荷情况下的PID控制器。最后,使用各个算法优化的PID控制器进行调节系统的空载频率扰动与负荷波动工况仿真实验。结果表明:所提出算法可以整定出最为合适的PID控制器参数,在不同时滞作用下调节系统均取得更好的控制效果。该研究为抽水蓄能机组调节系统PID控制器的设计提供了新思路。 相似文献
6.
7.
为适应水电机组的复杂工况和高指标的控制要求,提出了一种水力发电机组的模糊神经网络参数自整定PID控制系统.即利用多层神经网络构建模糊自适应PID控制算法,通过神经网络自学习能力在线提取模糊控制规则。优化控制器隶属度函数,根据不同时刻的误差e和误差变化ec,利用模糊逻辑控制,在线自整定PID参数,进一步完善了PID控制器的性能,提高了系统的控制精度。仿真实验表明:该控制器明显地改善了控制系统的动态性能,能使系统达到满意的控制效果,对进一步应用研究具有参考价值。 相似文献
8.
针对蚁群优化算法中易出现的停滞现象,设计出一种新颖的随机扰动蚁群优化算法。该算法包含了两个重要方面:一是提出了采用倒指数曲线来描述的扰动因子;二是设计出了相应的随机选择策略和扰动策略。此外,还对该算法中参数的选取方法及取值范围进行了研究和探讨。利用该算法求解最优机组组合问题,并在模型的转化、约束项的处理等方面进行了深入的分析。通过对两个测试系统进行计算,并与基本蚁群算法进行比较,证明了该算法可以有效地克服基本蚁群算法计算时间较长和容易出现停滞现象的缺陷,具有更好的全局优化能力。 相似文献
9.
介绍了小浪底水力发电厂调速系统出现的功率波动、功率异常升高和降低等运行不稳定的情况及其预防措施,并提出了对机组控制系统设计中的改进建议,可以供同类型机组运行和设计参考。 相似文献
10.
11.
本文提出一种改进蚁群算法(Improved ant Colony Optimization Algorithm)求解梯级水库群短期优化调度问题。该算法的改进主要包括嵌入邻域搜索的单库轮换寻优、基于出力反推的初始解生成技术和约束优先的目标函数比较方法。以四川某中型流域梯级三级电站联合运行为背景,对蚁群算法和改进蚁群算法的求解质量和收敛性进行比较,实例验证表明,改进蚁群算法可以获得较好的优化调度结果。 相似文献
12.
For the high dimensional and complex inner-plant economical operation problem of large hydropower station, an improved ant colony optimization with adaptive ability, inspiring ability and local search ability was proposed. Spatial optimal load distribution model and temporal unit commitment model was combined into an overall temporal and spatial economic operation model, in which an innovative ant colony model of multiple ant colonies, multiple outsets and multiple routes was adopted. Information entropy was applied to adjust the path selection strategy and pheromone updating strategy of ant colonies along with the change of its value during the iteration. Two inspiring factors were applied in the algorithm to guide the ant colonies to search for optimal paths in a more efficient and targeted way. Local search ability was guaranteed by local translation of unit start-stop points of the optimal solution in each iteration. In the optimal load distribution model, optimal distribution table was set in advance using dynamic programming, which only took account of the stable operation regions and avoided the cavitation and vibration areas for the security and stability of units. The proposed method is applied to the Three Gorges Hydroelectric plant. Compared with other methods under different water heads, this method shows optimized result under the premise of both calculation speed and stability. 相似文献
13.
将模糊控制和神经控制相结合,设计出一种单神经元模糊自适应控制器的控制策略.该控制策略充分利用了模糊逻辑对非线性的逼近性和神经控制自适应的特点.将该控制策略应用于某水电站混流式发电机组,在两种工况下进行仿真计算,仿真结果表明,该控制策略比常规PID控制系统具有更好的动态性能和适应性. 相似文献
14.
15.
非饱和土壤水分和溶质运移参数(扩散率、导水率和水动力弥散系数)取值范围较大,往往跨越几个数量级。采用传统离散化蚁群算法求解此类问题,所需节点较多,这会造成算法收敛时间较长。该文在传统蚁群算法基础上,对蚂蚁搜索路径进行改进,改进后的蚁群算法寻优路径由参数精度位数(整数位和小数位)、参数个数以及0–9十个数字构成,并将路径解码公式修改为具有判别参数正负功能的解码公式。采用改进的连续蚁群算法对非饱和溶质运移参数识别优化模型进行求解。数值模拟表明相同迭代次数下改进的蚁群算法比传统蚁群算法耗时少,算法计算时间与迭代次数满足线性关系,含水率和溶质浓度实测值与计算值吻合较好、相关性较高。 相似文献
16.
模糊理论在水轮发电机组故障诊断中的应用 总被引:4,自引:0,他引:4
以模糊理论为基础,结合水轮发电机组的结构设计,运行工况,现场运行人员和专家的经验,分析了故障与征兆之间的模糊关系,形成了水轮 发电机组诊断规则,建立了水轮发电机组模糊诊断自适应修正数学模型,并用某水电厂具体故障实例加以分析,诊断,验证,结果证明了该数学模型的合理性和适用性。 相似文献
17.
李家峡水电站接入系统与电气主接线按330kV一级电压与5回出线设计,发电机与变压器组合方式采用单元接线,330kV侧采用3/2断路器接线。机组与附属设备方面:水轮机为竖轴混流式,机型为HLD203-LJ-603;发电机为半伞式结构,型号为SF400-48/12800;调速器采用并联PID微机电液型;发电机采用自并激静止可控硅励磁,励磁调节器为PID数字式。发电机采用HEK6型户内强风冷SF6断路器。主变选用双线圈三相整体式,型号为SSP7-450000/330。开关站采用户内GIS方案。电站采用以计算机监控为主,PLC功能子系统为辅的监控模式。机组为双排布置,上游2台下游3台。 相似文献
18.
19.
大型水电机组普遍采用SiC非线性灭磁电阻进行灭磁,实时监测SiC非线性灭磁电阻事故灭磁过程中及灭磁后的特性,对于大型机组的安全运行至关重要。ESA-1装置研制目标是对SiC非线性灭磁电阻进行在线监测。本文论述了该系统在白山300MW水电机组上的应用情况,并对现场实测结果进行了初步分析,分析结果表明该系统可满足大型水电机组灭磁装置的在线监测需求。此外,该系统也适用于汽轮发电机等其它类型机组灭磁装置的在线监测。 相似文献
20.
Partially and Fully Constrained Ant Algorithms for the Optimal Solution of Large Scale Reservoir Operation Problems 总被引:1,自引:1,他引:0
This paper presents a constrained formulation of the ant colony optimization algorithm (ACOA) for the optimization of large
scale reservoir operation problems. ACO algorithms enjoy a unique feature namely incremental solution building capability.
In ACO algorithms, each ant is required to make a decision at some points of the search space called decision points. If the
constraints of the problem are of explicit type, then ants may be forced to satisfy the constraints when making decisions.
This could be done via the provision of a tabu list for each ant at each decision point of the problem. This is very useful
when attempting large scale optimization problem as it would lead to a considerable reduction of the search space size. Two
different formulations namely partially constrained and fully constrained version of the proposed method are outlined here
using Max-Min Ant System for the solution of reservoir operation problems. Two cases of simple and hydropower reservoir operation
problems are considered with the storage volumes taken as the decision variables of the problems. In the partially constrained
version of the algorithm, knowing the value of the storage volume at an arbitrary decision point, the continuity equation
is used to provide a tabu list for the feasible options at the next decision point. The tabu list is designed such that commonly
used box constraints for the release and storage volumes are simultaneously satisfied. In the second and fully constrained
algorithm, the box constraints of storage volumes at each period are modified prior to the main calculation such that ants
will not have any chance of making infeasible decision in the search process. The proposed methods are used to optimally solve
the problem of simple and hydropower operation of “Dez” reservoir in Iran and the results are presented and compared with
the conventional unconstrained ACO algorithm. The results indicate the ability of the proposed methods to optimally solve
large scale reservoir operation problems where the conventional heuristic methods fail to even find a feasible solution. 相似文献