Static Var Generator (SVG)

Intelligent Power Factor Correction — Real-Time, Accurate, Maintenance-Free

What is an SVG?

A Static Var Generator is a fully electronic reactive power compensation system. Unlike APFC capacitor banks, SVG delivers smooth and continuous PF correction — without switching surges, capacitor failures or delays.

Ideal for

Elevators, HVAC & cranes
Injection moulding machines
Pharma packaging lines
Hospitals & labs
Commercial complexes
Any facility with fluctuating loads

Key Benefits

Maintains PF up to 0.98 – 0.99
Response time of milliseconds
Step-less compensation for dynamic loads
Improves voltage stability
Corrects 3-phase imbalance
No capacitor ageing or maintenance
High efficiency & compact structure

Technical Advantages

DSP-controlled inverter technology
Works for inductive as well as capacitive loads
Modular kVAr-based build
Compatible with rapidly varying loads
Seamless integration with new or existing electrical systems

Technical Data Sheet

Electrical Specification
Rated Voltage	400V(300~456V)
Rating	30/50/75/100kVAr
Circuit Topology	Three Level IGBT
Network Configuration	3P3W/ 3P4W
Mains Frequency	50/60Hz±5%
Reactive Power Compensation Capability	Both inductive and capacitive reactive power
Reactive Power Compensation Performance	Cosφ ≥ 0.99 after compensation
Target Power Factor	Adjustable from -1.0 to +1.0
Overall Response time	≤5ms
Multi devices in parallel	Up to 12 sets can be connected in parallel
Output current limit	Automatically limited within 100% of rated capacity to output
Control Technology
Switching/control frequency	25.6kHz
Controller	DSP+FPGA
Control algorithm	Intelligent FFT, Self-adaptive control algorithm
Communication protocols	communication interface adopts RS485 and CAN bus, supporting mobile phone APP operation
Physical Specification
Human Machine Interface	7 inch touched LCD HMI
Installation method	Rack mounted, wall mounted
Cooling method	Speed regulation intelligent air cooling PWM Fans
Level of protection	IP20~IP54
Environmental Specification
Ambient temperature	-20 ~ 55 ℃ (rated power output)
Environment temperature	-30～70℃
Relative humidity	95 % at a maximum, no condensation
Altitude	Below 1500 meters above sea level
Cooling requirements	Require well ventilation, and the air vent can be opened through the cabinet door, or a fan installed in the cabinet

Typical Applications

Product Portfolio

Mechanical Drawings

FAQs

What is a Static Var Generator (SVG)?

A Static Var Generator (SVG) is an advanced electrical device used to enhance power quality by managing reactive power in real time. It helps maintain stable voltage levels and improves the power factor by either supplying or absorbing reactive power instantly. Compared to traditional capacitor banks, SVGs provide continuous and dynamic compensation, making them effective even under rapidly changing load conditions.

How do you choose the right SVG?

Selecting an SVG depends on several key considerations:

Reactive power requirement: Calculate the required kVAR capacity based on your system’s needs.
Type of load: Ideal for environments with fluctuating loads such as welding units, data centers, and heavy industries.
Response speed: Prefer systems with fast response times (typically under 5 ms) for dynamic applications.
Voltage compatibility: Ensure it matches your system’s voltage level and overall capacity.
Installation conditions: Consider whether it will be installed indoors or outdoors, along with environmental factors like heat, dust, and humidity.

How is an SVG different from a Capacitor Bank?

SVG: Uses IGBT-based technology to deliver continuous, real-time reactive power compensation with precise control.
Capacitor Bank: Operates in fixed or step-based modes, which can sometimes result in over- or under-compensation.

What is the difference between SVG and Active Harmonic Filter (AHF)?

Feature	SVG	AHF
Main Function	Reactive power compensation	Harmonic filtering + power factor correction
Key Advantage	Stabilizes voltage and improves power factor	Reduces harmonic distortion
Ideal Use	Voltage stability and PF correction	Environments with heavy harmonics (VFDs, UPS, nonlinear loads)
Technology	IGBT-based dynamic compensation	IGBT-based harmonic filtering
Response Time	<5 ms	<1 ms
Harmonics Impact	Does not remove harmonics	Actively eliminates harmonics

Summary: SVG is best for voltage regulation and reactive power control, while AHF is designed to handle harmonic distortion. For optimal performance, both can be used together.

Is SVG suitable for all load types?

SVG works best with dynamic and reactive loads, such as:

Welding machines
Elevators and cranes
Renewable energy systems (solar and wind)
Heavy industries (steel, cement, chemical plants)
Data centers, hospitals, and airports

However, it has minimal impact on purely resistive loads like heaters.

Can SVG and AHF work together?

Yes, they complement each other:

SVG: Improves power factor and manages reactive power
AHF: Eliminates harmonics and reduces THD

Using both is highly effective in systems with nonlinear loads like VFDs and UPS systems.

What is the difference between STATCOM and SVG?

Both technologies operate on similar principles using power electronics for fast compensation. The main distinction lies in their application:

STATCOM: Used in high-voltage transmission networks
SVG: Commonly applied in low- and medium-voltage industrial or commercial systems

How fast does an SVG respond?

Modern SVG systems use IGBT technology and can respond within 5 milliseconds or less. This makes them significantly faster than traditional solutions like TSC or SVC, especially in handling rapidly changing loads.

How does SVG compare with TSC (Thyristor-Switched Capacitor)?

Feature	SVG	TSC
Control	Continuous electronic control	Step-based thyristor switching
Accuracy	High precision, stepless	Limited precision
Response Time	≤5 ms	10 ms to 1 second
Harmonics	Does not generate harmonics	May cause resonance issues
Best Application	Dynamic loads	Stable loads
Maintenance	Low maintenance, long life	Higher maintenance due to switching wear

Can SVG be used in renewable energy systems?

Yes, SVG is widely used in solar, wind, and energy storage systems. It helps by:

Improving power factor to meet grid standards
Balancing phase currents
Reducing voltage fluctuations and flicker

Does SVG help save energy?

While SVG does not directly reduce energy consumption, it helps lower operational costs by:

Improving power factor and avoiding penalties
Reducing transmission losses
Enhancing equipment efficiency and lifespan

How do you determine SVG capacity?

To select the correct capacity:

Measure the system’s reactive power demand (kVAR)
Choose an SVG rating slightly above peak demand

For complex systems, consider using multiple distributed units

Can multiple SVG units operate together?

Yes, SVGs support parallel operation, allowing scalability:

Add units as demand increases
Install at different points in the system for better efficiency

Where should an SVG be installed?

For best performance, install SVG close to the load:

At substations or distribution panels (centralized)
Near load centers or production areas (decentralized)
Directly near specific equipment like VFDs or welding machines

What is the lifespan and maintenance of an SVG?

SVG systems typically last 15–20 years. Maintenance is minimal and includes:

Checking cooling systems
Cleaning dust
Monitoring system performance

What is the ROI of an SVG?

SVG systems usually offer a return on investment within 1–3 years, depending on:

Electricity tariffs and penalty structures
Savings from improved power factor
Reduced maintenance and longer equipment life

Which industries benefit most from SVG?

SVG is especially useful in industries with fluctuating or heavy reactive loads, such as:

Manufacturing (steel, chemical, cement)
Data centers and large motor applications
Ports, cranes, and elevators
Renewable energy systems

It can also be combined with AHF, TSC, or SVC for a complete power quality solution.

Static Var Generator (SVG)