Codes

几个线性拟合的matlab程序,用到了对数，一次，二次，( several linefitng programs,matlab )

变电站谐波状态估计程序，通过量测两个节点的电压和电流，计算得到另一个节点的电压电流相量，两个量测节点相角不同步，以一个节点相角为基准。(Substation harmonic state estimation procedure, by measuring the voltage and current of two nodes, one node is calculated voltage and current phasor, two phase angle measurement nodes are not synchronized with a phase angle of the reference node.)

5 bus power flow for power systems and analysis

matlab连接数据库SQL，然后打开数据库表格，并读取表格中的数据，进而对数据库进行操作(matlab connect to the SQL, and then open the table, and read the data in the table, then the operations)

说明：  三相桥式全控整流电路 变压器 Yd11 联结(Three-Phase Full-Bridge Controlled Rectifier Transformer Yd11 Connection)

this code written for solve a sample test function by pso based on mutation.

说明：  matlab功能宝典，绝对经典,里面有十八个压缩文件，好好使用(A book about Matlab)

dpxm simulink仿真 模块建立 波形分析(dpxm Simulink simulation)

halfwave dipole antenna

采样频率 fs=10000 轴承外环故障信号 fid=fopen( bearingout.dat , r ) 故障 N=1024 xdata=fread(fid,N, int16 ) fclose(fid) xdata=(xdata-mean(xdata))/std(xdata,1) 时域波形 figure(1) plot(1:N,xdata) xlabel( 时间 t/n ) ylabel( 电压 V/v ) db10小波进行4层分解 一维小波分解 [c,l] = wavedec(xdata,4, db10 ) 重构第1～4层细节信号 d4 = wrcoef( d ,c,l, db10 ,4) d3 = wrcoef( d ,c,l, db10 ,3) d2 = wrcoef( d ,c,l, db10 ,2) d1 = wrcoef( d ,c,l, db10 ,1) ( Sampling frequency fs = 10000 bearing outer ring fault signal fid = fopen (' bearingout.dat' , ' r' ) failure N = 1024 xdata = fread (fid, N, ' int16' ) fclose (fid ) xdata = (xdata-mean (xdata))/std (xdata, 1) time-domain waveform figure (1) plot (1: N, xdata) xlabel (' Time t/n' ) ylabel ( ' voltage V/v' ) db10 wavelet decomposition 4 layer one-dimensional wavelet decomposition [c, l] = wavedec (xdata, 4, ' db10' ) 1 ~ 4 reconstructed detail signal d4 = wrcoef (' d' , c, l, ' db10' , 4) d3 = wrcoef (' d' , c, l, ' db10' , 3) d2 = wrcoef (' d' , c, l, ' db10' , 2) d1 = wrcoef (' d' , c, l, ' db10' , 1) )