Static Var Generator (SVG)


Product available regions : Australia, China, EMEA, India, SEA, South Korea, Taiwan

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APF Principle

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 Principle

SVG - Waveform and Vector


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

System Selection

SVG Naming Rule

PQC SVG Naming Rule

SVG Model

SVG System Type Structure Model Name SVG Capacity Dimension (W×D×H) Weight
Independent Module System Wall-mounted PQCS-400-50-50WM4 50kvar 440×174×600mm 30 kg
Fixed Type Modular PQCS-400-50-50FM3(4) 50kvar 440×522×174 mm 30 kg
Cabinet System (Multiple Modules) Fixed Type Cabinet PQCS-400-50-50FC3(4) 50kvar 600×800×2000 mm 200 kg
PQCS-400-50-100FC3(4) 100kvar 600×800×2000 mm 240 kg
PQCS-400-50-150FC3(4) 150kvar 600×800×2000 mm 280 kg
PQCS-400-50-200FC3(4) 200kvar 600×800×2000 mm 320 kg
PQCS-400-50-250FC3(4) 250kvar 600×800×2000 mm 360 kg
PQCS-400-50-300FC3(4) 300kvar 600×800×2000 mm 400 kg
PQCS-400-50-350FC3(4) 350kvar 600×800×2000 mm 440 kg

Compensation Performance

SVG Compensation Performance

Delta’s PQC Series SVG can rapidly and continuously compensate both inductive and capacitive reactive power, and correct load imbalance. With sufficient capacity, the SVG ensures excellent fundamental power factor improvement performance.

Fundamental Power Factor (Cosφ) ≥ 0.99 (improves both leading and lagging PF)


SVG Actual Compensation Performance

Application: Harbor
Loads: Inductive Motors.
Compensation Results: Fundamental Power Factor (Cosφ) was improved from 0.82 to 0.99, current RMS value was reduced from 1335A to 1116A (around 16%).

Delta PQC, SVG performance harbor.jpg

Power and Energy were recorded by Fluke 435, as below.

Power and Energy

Delta PQC, SVG performance harbor - power and energy


Application: Petrochemical Industry
Loads: Inductive Motors
Compensation Result: Fundamental Power Factor (Cosφ) was improved from 0.44 to 0.98, current RMS value was reduced from 2436A to 1289A (around 47%).

Delta PQC, SVG performance petrochemical industry

Power and Energy were recorded by Fluke 435, as below.

Power and Energy

Delta PQC, SVG performance petrochemical industry - power and energy

Technical 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
Rated Current per Cabinet
50~350kvar (module combination)
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
Instant Response time
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)
>100,000 hours
Control Technology
Switching Frequency
DSP control
Modbus Protocol, RS232/485
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
Refer to SVG Model table
Refer to SVG Model table
Environmental Requirement
Ambient Temperature
Relative Humidity
≤1000m rated capacity, 1000~2000m(derating 1% per 100m)