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.
- 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
PQC Series Power Quality Solution (Brochure)
Active Power Filter (APF), Static VAR Generator (SVG)
Specifications
Electrical Specification
Rated Voltage : AC 400V
Input Voltage Range : AC 308V~480V
Electric Connection : 3P3W / 3P4W
Rated Frequency : 50(60)Hz ±10%
Rated Capacity per Module : 50kvar
Rated Current per Cabinet : 50~350kvar (module combination)
Redundancy : Each module is an independent reactive compensation system
Reactive Power Compensation Capability : Both inductive and capacitive reactive power
Reactive Power Compensation Performance : Cosφ≥0.99 after compensation (if the SVG capacity is sufficient)
Imbalance Correction Capability : Mitigate negative and zero sequence
Full Response time : <20ms
Instant Response time : <100us
Thermal Loss : ≤3% of SVG rated capacity
Output Current Limitation : Automatic (100% rated capacity)
Parallel Expansion(System) : Up to 10 Racks (7 modules per cabinet)
MTBF : >100,000 hours
Control Technology
Switching Frequency : 30kHz
Controller : DSP control
Communication : Modbus Protocol, RS232/485
Monitoring : PQC Monitor Software (Optional)
Physical Specification
IP Grade of Cabinet : IP20, IP30 or customization
Cooling method : Intelligent forced air cooling
Noise Level : < 60dB(A) @1m (Module)
Dust Filter : Optional
Dimension : Refer to SVG Model table
Weight : Refer to SVG Model table
Environmental Requirement
Ambient Temperature : -10~50°C
Relative Humidity : 0~95%
Altitude : ≤1000m rated capacity, 1000~2000m(derating 1% per 100m)
