The cleaner the grid, the greater the benefit

EPCOS active harmonic filters and power optimizers help to eliminate harmonic pollution from the grid, reduce power quality problems and use energy more efficiently and reliably.

  • Overview
  • Technical data
  • Panels and Accessories

The PQSine series is an active harmonic filter system designed to eliminate harmonic oscillations and consequently reduce costs. PQSine monitors the current signal and compensates the unwanted elements of the measured current. Thus, the filter ensures harmonic suppression independently of the number of loads. It also corrects the power factor, improving the system efficiency while reducing harmonic pollution.

Without PQSine
Harmonic disturbances caused by e.g. non-linear loads
With PQSine
Reactive power harmonic oscillations are actively compensated

PQSine at a glance:

Features

  • Harmonic compensation up to 50th harmonic
  • Flicker compensation
  • Ultra-fast reactive power compensation (inductive and capacitive)
  • Load balancing between phases and unloaded neutral wire
  • Compact design
  • Modular system extendable from 60 A to 600 A
  • Grid resonance detection
  • Advanced digital control with SDC (Selective Direct Control) algorithm
  • Ethernet and Ethercat system for interconnection
  • User-friendly menu operation
  • High performance and reliability
  • Simple installation

Typical applications

Fast current harmonics and reactive power suppression e.g. for:
  • Data centers
  • UPS systems
  • Green power generation (e.g. photovoltaics and wind turbines)
  • Sensitive equipment manufacturing (e.g. silicon wafer production, semiconductor production)
  • Industrial production machines
  • Electrical welding systems
  • Plastic industry machinery (extruders, injection molders)
  • Office buildings and shopping centers (3rd and triple harmonic cancellation and neutral conductor unloading)

Safety features

  • Highest safety and reliability
  • Overload protection
  • Internal short-circuit protection
  • Overheating protection
  • Overvoltage and undervoltage protection
  • Inverter bridge protection
  • Resonance protection
  • Fan fault alarm

Harmonic pollution is a growing problem with the increasing use of power electronics and non-linear loads (such as variable speed drives, UPS, computers, servers, TV sets, etc.).
The presence of harmonics increases the RMS current in power networks. The circulation of harmonic currents through the system impedance creates voltage harmonics which produce voltage distortions and thus deteriorate the quality of the supply voltage. This leads to higher operating and energy costs, production/process downtimes, overheating and malfunction of equipment.
The active harmonic filters and power optimizers of the PQSine series from EPCOS are based on the latest state of the art in power electronics technology. They are installed in parallel to the polluting loads. The active filter analyzes the line current and its associated harmonics and generates a compensation current which neutralizes the harmonic currents and creates an almost sinusoidal waveform (see Figure 1).
Figure 2 shows the total current harmonic distortion without PQSine. Figure 3 shows the result with activated PQSine, namely a cleaner grid.
In addition to eliminating the harmonics, the PQSine active filter and power optimizer also actively balances the loads to all three phases, performs dynamic VAR compensation and even some transient compensation. These features avoid line resonance and ensure high performance and reliability.

Main benefits
  • Standardized 60 A active filter modules
  • Three-phase 4-wire (3P4W) version for neutral current correction or three-phase 3-wire (3P3W) version for correction of phase currents only
  • Floating-point 32 bit DSP, FPGA (integrated)
  • Switching / control frequency 24/48 kHz
  • Reaction time: 21 μs
  • Selective direct control algorithm *)
    (no internal FFT algorithm needed)
  • Compensation up to 50th harmonic
  • Individually selectable degree of harmonic reduction
  • Simple electrical connection of power and control wiring

*) Patent pending

Technical data
System input / number of phases3-phase / 3-wire; 3-phase / 4-wire
Rate of harmonic reduction> 98%
Phase compensation current60 A120 A180 A240 A300 A
Neutral lead compensation current**)180 A360 A540 A720 A900 A
Input voltage (min. / max.)3P3W device: 180 V … 528 V
3P4W device: 180 V … 460 V
Inverter technologyThree-level NPC topology, IGBT
Frequency50/60 Hz ±3 Hz
Reaction time21 μs (immediate load change reaction)
Steady state response time< 300 μs (steady state response time to full steady state compensation)
Switching frequency24 kHz
Control frequency48 kHz
Harmonic compensationUp to 50th harmonic
Power factor correctionFully inductive and capacitive current compensation from 0 … 100%
Weight of a single unit59 kg 3P3W, 60 kg 3P4W
Dimensions of a single unit482 x 678 x 222 mm (w x d x h)
Current transformerSource or load-side selectable, primary current range 100 A … 2500 A, secondary current 1 A
Overload current150 A
@cf2.5
300 A
@cf2.5
450 A
@cf2.5
600 A
@cf2.5
750 A
@cf2.5
Typical power losses15 W/A15 W/A15 W/A15 W/A15 W/A
Cabinet mountingWall***)Wall***)FloorFloorFloor
Weight including cabinet96 kg160 kg413 kg474 kg535 kg
Dimensions including cabinet504 x 290 x 979504 x 514 x 979600 x 805 x 2095600 x 805 x 2095600 x 805 x 2095
Air flow rate470 cfm940 cfm1410 cfm1880 cfm2350 cfm
InterfaceEthercat 100 Mbit/s, USB, active sensor bus, display bus
Ambient temperature-10 … +40 °C full performance, up to +55 °C derating 2%/K
Protection classIP20 for module and wall-mounted panels, IP33 for floor-mounted panels (IP54 optionally available on request)
Panel colorRAL7035
Humidity95% non-condensing
Self-protectionYes
Overheating protectionYes
Overvoltage and undervoltage protectionYes
Noise level< 56 dB up to < 69 dB (depending on model and load conditions)
AltitudeMax. 4000 m (1% power derating for each additional 100 m, between 1500 m and 4000 m)
Standards / recommendations specifying limits for harmonics in networks or unitsIEC 61000-2-2, IEC 61000-2-4, IEC 61000-3-2, IEC 61000-3-12, IEC 61000-3-3, EN 50160, TOR D2, IEEE 519-1992, G5/4 and D.A.CH.CZ
Design standardsEN 50178, EN 61439-1, EN 61439-2, EN 61000-6-2, EN 61000-6-4, EN 55011

**) In the case of a 3P4W device / ***) Floor-mounting upon request

Wall-mounted panel (for 60 / 120 A) or floor-mounted cabinet (60 - 600 A)*)

Depending on the requirements, EPCOS offers either complete panels, wall-mounted cabinets or modules.
The state-of-the-art modular design of the PQSine series offers the advantage of being prepared for future filter power requirements: the slots in each floor-mounted cabinet are ready to receive up to 5 PQSine modules.

*) For 600 A, two 300 A cabinets are needed
TFT color control / display touch screen unit (7” / 12.1”)
  • For mounting in the panel front
  • Protection class: IP65
  • LED backlight
  • Intensity: 450 cd/m²
  • Input: touch screen 4-wire resistive
  • For parameter setting, status indication, alarm setting, monitoring,
    event logging
  • Operating system: embedded Linux
  • Communication: Ethercat Master, Ethernet TCP/IP, Modbus TCP
  • Interface: USB, 3x opto-insulated input, 2-relay output display bus
  • Operating temperature: -20 … + 55 °C
  • Firmware update via SD card possible
  • Dimensions (W x H x D): 230 x 168 x 56 mm (7”);
    340 x 270 x 53 mm (12.1”)
  • Weight: 1 kg (7”); 2 kg (12.1”)
SU active sensor unit
  • Interface for active sensor bus
  • Connection box for external current sensors
  • Module requirement (max. 5 modules per unit)
  • Source or load-side selectable, primary current range 100 A to 2500 A, secondary current 1 A
TFT color control / display touch screen unit in rugged equipment case
  • Needed for parameterization of PQSine modules ordered without the 7” / 12.1” TFT color control / display touch screen unit, for instance.