system

Voltage sags are one of the main problems in transmission and distribution grids with high penetration of distributed generation. This paper proposes a voltage support control scheme for grid-connected power sources under voltage sags. The control is based on the injection of reactive current with a variable ratio between positive and negative sequences. The controller determines, also, the amount of reactive power needed to restore the dropped voltage magnitudes to new reference values confined within the continuous operation limits required in grid codes. These reference values are chosen in order to guarantee low current injection when fulfilling the voltage support objective. Selected experimental results are reported in order to validate the effectiveness of the proposed control.

这是一个小波去噪的程序，除了实现了最经典的图像去噪算法外，还使用了最新的带有方向性的小波，去噪效果非常好(This is a wavelet denoising procedure, in addition to realize the most classical image denoising algorithms, but also uses the latest with a directional wavelet, denoising effect is very good)

matlab image processing code to detect a black ball

主要是将MIMO-OFDM系统中的空时分组码与MIMO系统中的空时分组码进行对比，着重突出MIMO-OFDM的优点。(Mainly in the MIMO-OFDM systems with space-time block codes in MIMO systems space-time block codes are compared to highlight the advantages of MIMO-OFDM. )

dist matrix clustering

包括欧拉梁单元，杆件梁单元，Truss单元，边界处理等。可通用，里面有变量说明。详细可参考THE FINITE ELEMENT METHOD USING MATLAB(Euler beam element)

simulink s函数的模板及编写步骤(the simulink s function template and write steps)

基于最小二乘方法的TOA（基于时间到达方法）定位，首先建立TOA的模型，然后用最小二乘进行仿真分析(TOA-based method of least squares (based on time arrival method) position, first established TOA model, then the simulation analysis using least squares)

BSheffield大学gatbs工具箱所有算例下载及调试说明，可直接下载到matlab文件夹下调用(BSheffield University gatbs Toolbox Download all examples and debug instructions can be downloaded directly to a folder called matlab)

this matlab code is useful for hill climbing algorithm.