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电力网理论线损管理系统的设计实现
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摘要
电力网的线损是一个综合性的经济、技术指标,而理论线损则是一面镜子,
    它不但能反映电网结构和运行方面的合理性,而且可以反映电力企业的技术和
    管理水平。本文在分析国内外大量文献的基础上,以电网理论线损的计算、分
    析及预测为目标,并结合秦皇岛电力公司的特点,应用Powerbuilder6.5编程
    语言设计开发了基于Oracle7.3网络数据库的电网理论线损计算、分析及预测
    系统。该系统能使管理部门用高效率的方法管理线损,提出切合实际的降损措
    施,对于电网设计规划部门则在设计阶段就能通过线损的模拟分析、预测功能
    采用较优的设计方案。
     通过调查研究,提出了应用改进的灰色系统预测模型预测电力负荷进而预
    测理论线损的方法,即首先对原始序列进行指数加权变换提高其光滑离散度后
    再使用GM(1,1)灰色系统预测模型预测电力负荷。实际的应用表明改进的
    GM(1,1)模型不仅仍然适用于电力负荷的预测,而且可通过参数β、γ的选择
    来改善预测的精度,扩大预测的范围。
     在如何确定最佳的指数加权参数β、γ值来获得最佳的预测的效果的问题
    上,本文提出使用遗传算法来确定灰色预测系统中最佳的指数加权参数β、γ。
    本文给出了参数β、γ详细的确定过程并编程实现。
     本系统已在秦皇岛电力公司正式运行,并通过了华北电管局的测试鉴定。
Abstract
    The line loss of e1ectric power is a compos1te economy and technology eqet,
    and that theoretic line loss is a mirrot, whicb not only reflects the rationality of
    electric power network's struCture and running bllt also reflects the technology and
    amagemen leve1 of electric powe enedse. In this paPer, after reading abundant
    relevan literatUre, domestic and oversea, combing the character of QialluangDao
    Electric Power Corporaion, based on Oacle7.3 database we designed a system
    which ahas at the calculaton. analysis and forecast of electric poweL Thiough thes
    system, the manqement deprtellt could manage line loss and put forward
    d.''
    measure, Whch mulndze the line loss in high efficiency, the design department
    could adoPt the beta scheine in design stag by analysis and forecast.
    We pul fOrward the method that aPply the improved Grey System to fOrecast
    the load of electric power and farther fOrecast the theoretic line 1oss, i.e. after
    transforming the original sequence by eXPonClltial weight, then its mild discrete
    degree is iInProved, we farther use GM(1,l) model to forecast the load. The actual
    aPplication indicated that the improved GM(l,1) model nOt only fits the f0recast of
    1oad but also increases the Precision of forecast through selecting the parameter fi'
    Y.
    In this paPer, we put forward the method that use Genetic A1gorithm to search
    the optima1 parameter P. Y, in the problem which how to confinn the optimal
    parameter g' Y fOr the optimal forecast effect. ln this paPeT, we also presented the
    Il
    
    
    detailed ascertain process of parameter /3 ~. ~ and actualized that through program. That system has been running formally in QinHuangDao Electric Power
    Corporation and had passed the test ofNCPG.
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