HTAF Series Passive Power Filter

description： Operation principle Main circuit simplified schematic and equivalent circuit of Passive Power Filter are as follows. Filter capacitor connects reactor to form series tuning filter branch circuits which used in main harmonic frequency needed flitting. Branch circuits connect with harmonic loads and form shunt branch with on load current. Main circuit simplified schematic of Passive Power Filter   equivalent circuit of Passive Power Filter   If on load harmonic current and net-side harmonic current are Ilh and Ish, , electric wire netting voltage is Ush,, electric wire netting equivalent impedance and filter harmonic impedance are Zsh and Zfh,, then harmonic equivalent circuit can be described in this equation.   In the situation of harmonic frequency series resonance, filter branch circuits appear lower impedance to harmonic current than electric netting wire to harmonic. So most harmonic current won’t get into electric netting wire by filter. Filter result is so good that Ish is lower than Ilh. Harmonic current is produced by harmonic voltage in Passive Power Filter which must be controlled in low level when design filter. To fundamental voltage, Passive Power Filter can compensate reactive power needed by on load as a capacitor.   It is consisted by detecting element, main control unit, switching execution unit, Passive Power Filter branch circuit (tune capacitor bank) and human-computer interface. Detecting element detects instantaneous value of system voltage and current on real time. It also calculates control parameter such as system harmonic elements, reactive power, voltage and current. Main control unit judge logic and give control command. It makes switching execution unit switch passive power filter to compensate on load harmonic and passive power. HTPF Passive Power Filter principle block diagram Characteristic 1.      Special design for customer’s power distribution system and load characteristic for best coordination 2.      Computer analog analysis technology and computer aid parameter optimize design technology get the best effect. 3.      Controller is based on new high-speed integrated control chip such as DSP and CPLD. It is fast and precise. 4.      Self adaptation technology is based on compensation parameter of passive power and harmonic analysis. 5.      Special technology of no-transient high-speed switching tune capacity bank is adopted. Filter branch circuit has no inrush current impact so filter can switch quickly. 6.      it is integrated passive compensation and harmonic management. Equipment’s cost effective is high.   Main technology parameter item index rating voltage three phase 400V/690V+10%-15% Rating frequency 50Hz±2% Rating compensation capacity of fundamental wave 100kvar—2000 kvar Rating harmonic current capacity 150A—3000A   Filter ration of typical harmonic 5th, 7th, 11th, 13th harmonic≥65%， higher than 13th harmonic ≥50% Switch series of filter unit 4—10 Power factor cosφ=0.85～0.99（it can be designed） Response time 20ms - 30s it can be chosen Wattful loss ＜1.5% compensation capacity of fundamental wave noise ≤55dB Protection function   Abnormal voltage protection; over load limitation; system error protection; system overheat protection External dimension 1000×1000×2200 standard MNS machine cabinet×N Storage Temperature -40～55 ℃ Serving temperature -10～40 ℃ Relative humidity ≤ 95%， not condensation