大功率混合型APF用于大型冶炼厂谐波治理

为消除电力系统谐波及其巨大危害,根据大型冶炼厂谐波治理的特点,提出了一种新颖的拓扑结构-大功率混合型有源滤波器,它将串联谐振注入型有源滤波器与无源滤波器并联混合,由电容静态补偿无功功率,由有源和无源部分共同抑制谐波。实践证明该装置具有较好的滤波效果和一定的无功补偿能力。

Application of APF to Harmonic Elimination in a Smeltery

Nonlinear loads such as traditional diode/thyristor rectifiers with capacitive and inductive loads generate harmonic and reactive current,which leads to poor power factor,low energy efficiency and harmful disturbance to other appliances.The deregulation of electric power generation and distribution market is becoming an inevitable trend.Though passive power filter is cheap and simple,the effect of harmonic suppression is greatly influenced by impedance and its own parameters,and resonance may occur between power impedance and passive filter.Active power filters are researched and developed as a viable alternative over the conventional methods to solve these problems.The active power filter can compensate harmonics and reactive power of the nonlinear load effectively.Presently active power filter are designed to absorb all of the generated harmonics and reactive power required by the load and make the source current sinusoidal.Hence,in order to eliminate the harmonic of power system and avoid its tremendous harms,a novel High-capacity hybrid active power filter(HHAPF) is proposed to meet the requirement of substation harmonic elimination.The HHAPF which is composed of series resonators injection APF and PF by parallel hybrid,can make static compensation of reactive power by capacitor and it can eliminate harmonic by the co-function of active filter and passive filter.Practice shows that the new HAPPF has good filter effect and certain capacity of reactive power compensation.