PQSine® S Presentation

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

The PQSine S series is an active harmonic filter system designed to eliminate harmonic oscillations and consequently reduce costs. PQSine S series 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 50^th harmonic
Ultra-fast reactive power compensation (inductive and capacitive)
Load balancing between phases and unloaded neutral wire
Compact design
Modular system extendable from 25 A to 600 A
Grid resonance detection
Advanced digital control algorithm
Ethernet and MODBUS inferace
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 3^rdand triple harmonic cancellation and neutral conductor unloading)

Safety features

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

Technical data

Main benefits

Standardized active filter modules
Three-phase 4-wire (3P4W) version for neutral current correction (ordering code B44055F4*S*) or three-phase 3-wire (3P3W) version (ordering code B44066F3*S*) for correction of phase currents only
Floating-point 32 bit DSP, FPGA (integrated)
Switching / control frequency 20-50 kHz
Reaction time: approx. 20 μs
Innovative control algorithm
Compensation up to 50th harmonic order
Individually selectable degree of harmonic reduction
Simple electrical connection of power and control wiring

Technical data and specifications
Rated voltage	380 V (228...456 V)	480 V (384...552 V)	690 V (480...790 V)
Mains frequency	43...62 Hz
Rated filter current	25, 35, 50, 60, 100, 150	75, 90 A
Neutral filtering capability	3 times the rated filter current (in case of 4 wire device)
Harmonic current compensation range	2nd to 50th harmonic order, or specified harmonics 0 to 110%
Rate of harmonic reduction	> 97% *)
Typical power losses	< 3% (depending of the load)
Target power factor	Adjustable from -1 to 1
Switching frequency	20 kHz / 35 kHz
Reaction time	Approx. 20 μs
Overall response time	< 5 ms
Harmonic compensation	Available
Reactive power compensation	Available
Unbalance compensation	Available
Display	All systems include a 7" TFT color control / display unit (touch screen)
Communication ports	RS485 and network port (RJ45)
Communication protocols	Modbus (RTU), TCP/IP (Ethernet)
Fault alarm	Available, max. 500 alarm records
Noise level	< 56 dB (depending on the model)	< 65 dB (depending on the model)
Protection functions	Overvoltage, undervoltage, short-circuit, inverter bridge inverse, overcompensation
Ambient conditions	-10 to +40 °C without derating. Solutions for higher ambient temperatures on request
Relative humidity	5 to 95%, non-condensation
Cooling	75, 151, 300, 405 L/sec (25-35, 50-60, 75-100, 150 A)	359 L/sec
Protection class	IP 20 , (opt. IP30, IP31, IP42, IP 54) according to IEC 529 (customizable)
Panel color	RAL7035 light grey
Altitude	1500; 1% up 1500 m. Between 1500 m to 4000 m, according to GB/T3859.2, the power decreases by 1% for every additional 100 m
Qualifications	CE, IEEE 61000	CE, ETL (UL 508 and CSA C22.2 # 2014), IEEE 61000
Compliance with standards	IEEE 519, ER G5/4

*) For typical harmonic order distortions

Advantages

Advantages of AHF PQSine S series three-level NPC topology

The AHF PQSine S Series range operates on the basis of a three-level Neutral-Point-Clamped (NPC) topology circuit. As can be seen from the diagrams below, the conventional two-level circuit configuration consists of 6 IGBTs (two IGBT power devices in each phase leg and current path). In case of a three-level topology, the circuit configuration consists of 12 IGBTs (four IGBT power devices in each phase leg and current path).

The three-level NPC circuit can produce three voltage levels at the output: the DC bus plus voltage, zero voltage and DC bus negative voltage. The two-level topology can only connect the output to either the plus bus or the negative bus. It also ensures higher quality and better harmonics of the line-to- line output voltage, thus reducing the output filter requirement and the associated costs.

Main advantages of the three-level NPC topology are:

Lower losses: only half of the voltage has to be switched, thus reducing the switching losses in the transistor. Three-level solutions are characterized by reduced circuit losses and higher efficiency, thus supporting energy-saving concepts.
Smaller output current ripple: the NPC three-level topology has a lower ripple in the output current and half of the output voltage transient thanks to a higher quality output voltage. This improves performance and reduces the internal filter requirement.