Study On Synchronous Phasor Measurement Algorithm For Dynamic Conditions

The wide-area measurement system based on the synchronous phasor measurement device is the core part of the real-time dynamic security monitoring system of the power network.The core of the synchronous phasor measurement device is the synchronous phasor measurement algorithm.However,the measurement error will increase when the grid is subjected to dynamic operation such as frequency offset and transient stability,which will affect the accuracy of grid parameter state estimation and reliability based on wide-area measurement system application;large-scale distributed Power access to the power system and a large number of power conversion equipment in the UHV transmission system are used in the power system,so that the harmonic hazard problem of the power system is gradually aggravated,and harmonic data is needed for monitoring and prevention,and the synchronous phasor measuring device As an important data source of the whole network,it is required not only to quickly and accurately measure the power frequency phasor of the power system,but also to accurately extract the harmonic phasors,and provide data support for the prevention and control of harmonic pollution;thus improving the dynamics of the power system.The accuracy of running the synchronous phasor measurement algorithm and the fast and accurate extraction of harmonic phasors and grid frequency have certain engineering significance for the stable and reliable analysis of the power grid,harmonic monitoring and prevention.This paper first introduces the research status of synchronous phasor measurement algorithms at home and abroad,and points out the problems existing in current algorithm measurement.Considering the adaptability of the future development of the power grid to the signal observation model,the signal model commonly used in the synchronous phasor measurement algorithm is deeply analyzed.The attenuation index and the signal model are selected as the research object,in view of the matrix beam algorithm in the research object,the advantages of filtering DC components and inter-harmonics are filtered out.Based on this algorithm,the measurement error of the dynamic frequency offset is analyzed in depth to find out the corresponding improvement method.In the study of the frequency under the dynamics of power system,a frequency measurement algorithm based on matrix beam is proposed.And programming on MATLAB,the simulation of the frequency fluctuation of the grid and the different signals,verify the correctness of the frequency measurement method proposed in this paper,and build a model in PSCAD to obtain dynamic signal data,import into MATLAB,further indicate The correctness of the algorithm,so the proposed frequency measurement algorithm has important practical engineering application value.In addition,according to the error analysis of the matrix beam algorithm under frequency offset,the frequency obtained by the frequency measurement algorithm is used to improve and reduce the measurement error under the frequency offset.The correctness of the improved method is verified by programming on MATLAB.Based on the research of synchronous phasor measurement algorithm,this paper proposes a harmonic phasor measurement algorithm based on matrix beam,which realizes fast and accurate extraction of fundamental phasor and target harmonic phasor of power grid,and programming on MATLAB.Simulation,taking the fundamental phasor and third harmonic phasor measurement as an example,the simulation results verify the correctness of the algorithm,and compared with the FFT algorithm,when the grid dynamics contains the attenuation DC signal,the proposed algorithm accuracy Higher,with certain engineering application value.