电力系统保护与控制
電力繫統保護與控製
전력계통보호여공제
POWER SYSTM PROTECTION AND CONTROL
2015年
7期
90-96
,共7页
频谱分析%短期负荷预测%旋转不变矢量技术%K均值聚类%最小二乘法
頻譜分析%短期負荷預測%鏇轉不變矢量技術%K均值聚類%最小二乘法
빈보분석%단기부하예측%선전불변시량기술%K균치취류%최소이승법
frequency spectrum analysis%short term load forecasting%estimating signal parameter via rotational invariance techniques (ESPRIT)%K-means clustering%least square method
电力负荷具有一定的周期相似性,为此,提出一种基于子空间旋转矢量不变技术(ESPRIT)的综合负荷预测方法。对电力负荷数据进行移位平移处理构造出满足子空间不变性的数据矩阵,利用最小二乘法ESPRIT原理进行谐波检测,提取出各主要频率分量成分。利用K均值聚类法把提取的分量根据频率特点分为不同类型,之后建立不同预测模型对各部分进行独立负荷预测,最终得到综合的预测负荷值。ESPRIT算法具有较高的频谱分辨率,可降低原数据维数,且综合预测法能针对不同成分有更好的预测。最后仿真也证明了该方法预测的准确性及有效性。
電力負荷具有一定的週期相似性,為此,提齣一種基于子空間鏇轉矢量不變技術(ESPRIT)的綜閤負荷預測方法。對電力負荷數據進行移位平移處理構造齣滿足子空間不變性的數據矩陣,利用最小二乘法ESPRIT原理進行諧波檢測,提取齣各主要頻率分量成分。利用K均值聚類法把提取的分量根據頻率特點分為不同類型,之後建立不同預測模型對各部分進行獨立負荷預測,最終得到綜閤的預測負荷值。ESPRIT算法具有較高的頻譜分辨率,可降低原數據維數,且綜閤預測法能針對不同成分有更好的預測。最後倣真也證明瞭該方法預測的準確性及有效性。
전력부하구유일정적주기상사성,위차,제출일충기우자공간선전시량불변기술(ESPRIT)적종합부하예측방법。대전력부하수거진행이위평이처리구조출만족자공간불변성적수거구진,이용최소이승법ESPRIT원리진행해파검측,제취출각주요빈솔분량성분。이용K균치취류법파제취적분량근거빈솔특점분위불동류형,지후건립불동예측모형대각부분진행독립부하예측,최종득도종합적예측부하치。ESPRIT산법구유교고적빈보분변솔,가강저원수거유수,차종합예측법능침대불동성분유경호적예측。최후방진야증명료해방법예측적준학성급유효성。
According to the similarity of power load, this paper proposes an integrated load forecasting method based on estimating signal parameter via rotational invariance techniques (ESPRIT). First, the raw data signal is broken up into blocks through a spinning method, and then, it is separated into independent harmonic ingredients by using the least squares ESPRIT algorithm. In addition, before forecasting the power load with different models to get the final integrated forecasting load, we should cluster the ingredients for several categories by K-means clustering. ESPRIT algorithm which has high frequency resolution, is not requested to the synchronized sampling, and it can reduce the dimension data matrix. A better forecast is got by comprehensive forecasting method. Finally, MATLAB simulations indicate that the method is proved to be more stable, accurate and effective. This work is supported by the Science and Technology Supporting Program Project of Sichuan Province (No. 2012GZ0009).