The Research Of Load Modeling By On-line Component Method Based On The Actual Electric Power Network

In modern electric power systems, a reasonable accurate representation of load is necessary for power system stability and dynamic analysis. Load modeling is one of the most important cause effecting the precision and credibility of the simulation result. Over the years, as an important component of smart grid, load modeling research has been lagging behind the development of power industry. In Chongqing, the main component of load are heavy loads and air-conditioning load. Chongqing Power Grid is currently used in 40% of induction motor +60% constant impedance load can truly reflect the characteristics of us is worth studying. Based on the historical comparison of load modeling method, the method was proposed load modeling by online survey in different time based on component-based method based on the actual power grid synthesis:Difficult for traditional statistical synthesis method statistics, the heavy workload, the model can not be adjusted over time, this paper proposes an online time-sharing model: At first, all users are divided into industrial load, the residents, commercial and agricultural load; The device is divided into dynamic and static load equipment load equipment categories, select the typical user survey, comprehensive load characteristics are typical of the industry; Then under the negative control system and daily load curve of the industry load curve separated by the typical period of load constitute a proportion of nodes industry. Finally, according to the load characteristics and the proportion of each industry the node load characteristics at each time.Detailed survey based on the actual network load is the basis of online time-modeling. Equipment is divided into load equipment and intermittent long run equipment, and improve the accuracy of the survey. To achieve the reliability of survey results by survey methodology described load, process. Point of view of use the cluster analysis based on fuzzy mathematics used in statistics based modeling approach, the typical user survey in the mathematical treatment. Elaborate survey equipment for calculating the load ratio, the ratio reached a practical device. Implementation of the theory, the load characteristics are typical examples of the industry.Based EMS system and the negative control system, a complete load model by industry according to the principle of time-sharing been proposed: Based on actual daily load data on EMS systems and industrial control system of negative load data, load relative isolate the growth curve in other industries, extraction of long load power, then the general seasons, summer and winter, the typical daily load characteristics of various industries, the seasons typical daily load curve of a typical time period, the sub-sector load based on a basic model, come to constitute a model of load load growth curve relative to consider the sub-seasonal time-sharing industry, and finally come to constitute a model of load, and to Example out of the sub-node time-sharing industry, consider the season, the results show that the composition model is the right action.Through comprehensive load characteristics and composition of the proportion of the industry, get load model nodes and model calculated by running the actual power input PSASP trend data to prove the feasibility and effectiveness of this method...