消除电力谐波污染 确保电网运行安全

Eliminate the Harmonic Pollution to Insure Safe Running of Electric Power Systems

笔者从维护绿色电力环境、确保电网运行安全的角度出发 ,简述了抑制和消除电网谐波污染意义 ,着重介绍了一种新颖的用于消除电网谐波污染的装置 (有源电力滤波器 )的滤波原理和研究。这种滤波器与传统的LC无源滤波器的区别在于它采用了积极主动的滤波方式 ,将检测到的电网谐波电流经DSP(高速数字处理器 )运算处理后生成谐波补偿电流指令信号 (六路PWM驱动信号 ) ,然后 ,用此信号去驱动由 6只MOSFET管组成的三相逆变电路 ,逆变电路产生谐波补偿电流去抵消电网谐波电流 (谐波补偿电流与谐波电流大小相等、方向相反 )。理论研究和实验结果表明 :在电力系统中使用该装置可动态抑制和消除谐波电流 ,为维护电网运行安全和绿色电力环境提供了必要的技术保障。

The signification of eliminating harmonic pollution in electric power systems from the view of maintaining green electric power environment is briefly described; the principle and development of an active power filter device used for eliminating harmonic pollution in electric power systems are emphatically introduced. The difference between this new device and LC passive filter is that this device has used active filter method, with which the device firstly detects harmonic current in electric power net and deals with the current by DSP, subsequently, creates instruction signal of harmonic compensation current. The three phase adverse circuit composed of six MOSFET transistors driven by the signal to produce harmonic compensation current. The harmonic compensation current counteract with harmonic current (harmonic compensation current and harmonic current are of equal quantity, and adverse in sign). Theoretical and experimental study shows that the device could dynamically eliminate harmonic current to provide necessary technological guarantee for maintaining safe running of electric power systems and to insure green electric power environment.