The increase in power energy productivity has improved living standards, and most of the electrical loads used in the intelligent power consumption are nonlinear nowadays. Harmonic current is generated by these nonlinear loads, and is formed by the superposition of countless sinusoidal currents whose frequencies are integer multiples of the fundamental current. When all the waveforms are superimposed, they will become distorted waveform. SFR-APF free stand harmonic filter cabinet is a new type power electronic installation for dynamic harmonic filtering. It could filtering the harmonic in content and frequency in real time. It overcomes the shortcoming of the conventional harmonic filter and reactive power compensation, achieving the harmonic filtering function and reactive power compensation function systematically. It’s widely use at the power , metallurgy, petroleum, sea port, chemical and mining industries. …