Research On Key Problems Of Harmonic Simulation System Based Electric Power Big Data

Harmonics are the main factors that affect the quality of power,and have a great impact on the stable operation of the public power grid.With the rapid expansion of power grid scale and the application of new electronic equipment,harmonic problems are becoming more and more prominent.The control of harmonics is of great significance to the safety,economy and operation of power systems.Harmonic simulation system is a kind of application system that supports power analysis through computer software,which can assist power system staff in harmonic control,harmonic source deployment and grid planning.This paper focuses on three questions in harmonic simulation system:first,in the aspect of system's ease of use,interactivity and intuitiveness,traditional power simulation systems have shortcomings in visual modeling,and there are problems of low modeling efficiency,poor graphic operability,and difficulty in maintenance;Second,harmonic simulation calculation is the core of harmonic simulation system.The mainstream power simulation system generally has limited support for harmonic calculation model,and there are also inflexibility problems in parameter configuration;Third,power big data has rich value.Applying power big data to harmonic analysis can predict harmonic data,and it has forward-looking significance for power grid design and planning.However,there is currently no system combining power big data with harmonic simulation calculations.Aiming at the above three problems,this paper discusses harmonic simulation system based on power big data from three aspects:visual modeling,harmonic simulation calculation and harmonic risk analysis based on power big data.The main research work of this paper is as follows:(1)Considering the requirements of the harmonic simulation system in the three aspects of visual modeling,harmonic simulation calculation model,power big data and harmonic simulation system,the overall framework of the harmonic simulation system is proposed,which consists of four layers:data layer,data conversion layer,application layer and functional layer.(2)In order to meet the requirements of system operability,interactivity and intuitiveness,this paper proposes a power component model and a circuit diagram model to support visual modeling of circuit diagrams.The power component model describes information such as component primitives and component attributes;the circuit diagram model describes information such as component locations,topological connections between components.Based on the power component model and the circuit diagram model,the results of the visual modeling will have a uniform and standardized structure and interact as input data with the harmonic simulation calculations.(3)In order to meet the requirements of flexible support for multiple harmonic calculation models,this paper extends the OpenDSS harmonic calculation engine and designs a harmonic calculation model with adjustable parameters,which is composed of parameter generator,circuit diagram model,calculation script generator and calculation engine.Through the configuration of parameters,it can support the calculation of various harmonic simulation models such as time series harmonic calculation model and random harmonic calculation model.(4)In order to make full use of the value of power big data,this paper introduces the measured data in the power big data platform into the harmonic simulation calculation to generate the harmonic source characteristics,and uses various prediction models and evaluation indicators to predict the harmonic source characteristic data and form the future trend of harmonic data,which provides a basis for harmonic risk analysis and has important reference value for harmonic monitoring and control.