It is the first time that the theory of wavelet has been applied in the signal processing of the codog power plant experiment rig and wavelet transform denoising was used , it may keep the aiguille and saltation parts , wipe off the noise and pick up the useful signal , it is benefit to analysis the result in experiment 把小波分析理论应用于codog实验台信号处理中，用小波变换进行信号消噪，可以很好的保存有用信号中的尖峰和突变部分，将信号的噪声部分去除，从中提取出于有用信息，更有利于实验结果分析。
In the design and debugging process we found that two different caps with parallel connection may make the amplifier instability . with the analyses of the nonideal cap molding we found that the response curve of two different caps with parallel connection has a saltation whose impedance is infinity and at this pot the amplifier is easy to oscillate . than some suggestion of the use of cap in amplifier design is presented 在放大器的设计、调试过程中发现两个不同容值的电容并联会带来电路的潜在不稳定,对实际电容,即带有寄生电感和寄生电阻的电容,建模、分析后发现,不同容值的电容直接并联其响应曲线会有一个阻抗值为无穷大的突变点,该突变点可能会引起电路的自激。
According to the characteristic of nine - area diagram of substation vol / var coordinated control , this system gives the defination of fuzzy sets and the degree of membership of input / output variables , and designs corresponding control rules . the results of simulation demonstrate the system can satisfy the constrains of the day - adjusting times of the switching of on - load transformer and paralleled compensation capacitors , and ensure voltage quality , reactive power basical balance . considering the var requirement in different load time period and the control demand in load saltation , a improved control scheme is provided . the results of simulation show the improved scheme can meet the demand of vol / var in different load time period , protect the wrong operation when either voltage or reactive power appears saltation , and decrease the times of regulation of the switching of on - load transformer and paralleled compensation capacitors finally , a background software module of substation vol / var coordinated control is designed , based on the supervisory control and data acquisition system of substation 仿真结果证明该系统能在各种负荷条件下确保电压合格和无功基本平衡，且能满足变电站对有载调压变压器分接头日调节次数和并联补偿电容器组的日投切次数的限制。通过考虑不同负荷时段对无功功率的需求和负荷突变情况下的控制要求，对上述模糊控制策略进行了改进，仿真结果证明改进后的控制策略能满足不同负荷时段对电压和无功的要求、抑制电压或无功突变情况下的误动作，且有效地减少了有载调压变压器分接头和并联补偿电容器组的调节次数。最后基于变电站scada系统设计了一后台电压无功综合控制软件模块。
