Advanced power electronics equipment applications can improve our work efficiency and make life easier, but at the same time, they can pollute the power grid. Rectifiers play a large part in many applications that are growing faster than power grid construction. Voltage and current harmonics, reactive power fluctuation, three-phase imbalance, and other issues are caused by rectifiers with power quality issues that threaten the reliability and efficiency of the power supply system. Similarly, power voltage amplitude and frequency issues are affected by power generation.
We need to eliminate grid harmonics, reactive power fluctuations, imbalance, and other issues to adapt to new electronic equipment and power quality problems.
Special Features of Delta Power Quality Solution:
- Wider range of operating temperaturesDelta PQC series APF & SVG can normally work without any derating from -10°C~ 50°C, which is suitable for most applications
- Withstands extreme electrical conditionDelta’s PQC series APF & SVG can withstand severe harmonic distortion of voltage, they can work normally under conditions with THDu (total harmonic distortion of voltage) up to 15%
- Compatible with diesel generators
Simple and Flexible Application
- The Delta PQC series APF & SVG’s modular structure makes it easy for installation, maintenance and capacity expansion.
- APF & SVG modules can be embedded in Delta’s standard cabinets or third-party cabinets, making it possible to customize cabinets for special requirements.
Excellent Compensation Capability
- Delta’s PQC series APF & SVG applies 3-level inverter topology and up to 60 kHz switching frequency, which provide excellent power quality compensation accuracy, response speed and output ability.
High Reliability
- Module redundancy technology
- Intelligent air cooling technology
- Top brand electronic components
- Advanced production technology
Delta’s PQC Series APF is connected in parallel with non-linear loads, and uses one set of current transformers (CT) to detect the load current. It calculates each order harmonic current by FFT algorithms in its DSP microchips and then generates a compensating current with the same amplitude but opposite phase angles to the detected harmonic current, which cancels out the original load harmonics.
The PQC series APF not only eliminates harmonic current from the load side but also mitigates harmonic voltage caused by harmonic currents. The APF system can also improve power factor (PF) and correct load imbalances in the power system.
APF Structure
Delta PQC Series APF has a modular design. Usually, the Delta active power filter system consists of one or several APF modules and an optional Liquid Crystal Monitor & Control Panel (LCM). Each APF module is an independent harmonic filtering system, and users can change the harmonic filtering system rating by adding or removing APF modules.
According to the mounting type, Delta PQC series APF can be divided into Modular APF and Wall-mounted APF.
Modular APF
APF modules and an LCM panel can be embedded in Delta’s standard APF cabinet or a customized cabinet. There are breakers, cable terminals and Surge Protection Device (SPD) in the APF cabinet.
According to cable terminal type, a modular APF can be divided into two types:
- Draw type modular APF (hot-swappable)
- Fixed type modular APF (not hot-swappable)
Wall-mounted APF
Delta’s Wall-mounted APF can be installed on a wall, which is suitable for low rating applications, and an optional LCMpanel can be fixed on the all-mounted APF according to customer requirements.
FEATURES
- Multifunctional: Harmonic, reactive power and imbalance compensation
- High harmonic filtering rate: Up to 98%
- Excellent reactive compensation: High speed, Precise (-0.99≤PF≤0.99), Step-less, Bi-directional (capacitive and inductance) compensation
- Excellent imbalance correction: Both negative and zero sequence, mitigates neutral current
- Wide input voltage & frequency range, adapts to tough electrical environments
- Low thermal loss (≤3% of rated APF kVA), efficiency ≥ 97%
- High stability: Infinite impedance to grid, avoids harmonic resonance problems
- Flexible application: Modular design, embedded in standard or customized cabinet
- Easy installation and maintenance: Plug-in installation for APF module replacement and expansion
- Wide capacity range: 50A~525A for a single cabinet, up 10 cabinets in parallel
- Environmental adaptability: -10~50°C temperature, compatible with diesel generator
- Complete protection: Grid Over/Under voltage, APF over current, over temperature, and more. All faults are recorded in the event log, which is convenient for failure analysis
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Introduction
SVG Principle
The principle of the SVG is very similar to that of Active Power Filter, as demonstrated in the picture below. When the load is generating inductive or capacitive current, it makes load current lagging or leading the voltage. SVG detects the phase angle difference and generates leading or lagging current into the grid, making the phase angle of current almost the same as that of voltage on the transformer side, which means fundamental power factor is unit.
Delta’s PQC series SVG is also capable of correcting load imbalance.
SVG Structure
Delta PQC Series SVG is also modular in design, and the Delta SVG system consists of one or several SVG modules and an optional Liquid Crystal Monitor & Control Panel (LCM). Each SVG module is an independent reactive power compensation system, and users can change the SVG rating by adding or removing SVG modules.
SVG modules and LCM panel can be embedded in Delta’s standard SVG cabinet or in a customized cabinet. There are usually breakers, cable terminals and Surge Protection Device (SPD) in the SVG cabinet.
Features
- Multifunctional: Reactive power and imbalance compensation
- Excellent reactive compensation: High speed, Precise (-0.99≤Cosφ≤0.99), Step-less, Bi-directional (capacitive and inductance) compensation
- Excellent imbalance correction: Both negative and zero sequence, mitigates neutral current
- Wide input voltage & frequency range, adapts to tough electrical environment
- Low thermal loss (≤3% of rated SVG capacity), efficiency ≥ 97%
- High stability: Infinite impedance to grid, avoids harmonic resonance problem
- Flexible application: Modular design, embedded in standard or customized cabinet
- Easy installation and maintenance: Easy installation for APF module replacement and expansion
- Wide capacity range: 50kvar~350kvar for a single cabinet, up to 10 cabinets in parallel
- Environmental adaptability: -10~50°C temperature, compatible with diesel generators
- Complete protection: Grid over/under voltage, SVG over current, over temperature, and others. All faults recorded inevent log, convenient for failure analysis