Static Var Generator SVG 40kvar for Welding Workshop

Static Var Generator SVG 40kvar for Welding Workshop

Product Specification Overview :

This 40kvar Static Var Generator is purpose-built for welding workshops. Welding equipment generates sharp, intermittent impulse loads, which easily trigger voltage flicker, distorted current waveform and unstable power factor. These issues can cause inconsistent welding quality, shorten the service life of transformers and bring unexpected utility power-factor penalties.Our SVG adopts voltage-source PWM inverter design with high-speed IGBT power modules. It continuously absorbs or injects reactive current to stabilise the grid voltage under rapidly changing welding loads. Unlike traditional TSC and capacitor compensation cabinets that only perform stepped switching, this unit delivers stepless real-time output adjustment to match the instantaneous load fluctuation of welding machines.Installed in welding workshops, the device suppresses voltage flicker, improves power factor and mitigates harmonic distortion, ensuring stable welding output and consistent workpiece quality. Every ND-SVG-40-380 unit undergoes full-load aging testing at our factory before shipment, to guarantee stable operation under frequent impact load conditions in welding production lines.

Key Features :

1. Model ND-SVG-40 adopts robust modular cabinet structure and industrial-grade electronic components, capable of enduring frequent impact loads in welding workshops.
2. Fitted with PWM intelligent variable-speed cooling fans. Fan speed automatically adjusts according to real-time working load. Operating noise remains below 55dB while keeping the active power loss lower than 2.5%.
3. Strong anti-electromagnetic interference capability, resisting electromagnetic interference generated by welding machines, to ensure uninterrupted stable operation. Optimized internal circuit layout reduces energy consumption and extends the whole machine service life.
4. All-in-one integrated compensation function: simultaneous reactive power adjustment, harmonic filtering and three-phase imbalance correction, solving multiple power quality troubles brought by multi-set welding equipment.
5. Supports multi-unit parallel expansion. When the workshop adds more welding machines later, users can increase total compensation capacity without replacing the existing SVG equipment.
6. Optional built-in or external touch HMI, convenient for on-site operators to check operating parameters.
7. Fully certified with CE, IEC, RoHS and ISO, meeting the power grid access requirements of overseas industrial workshops.

Working principle and core technology :

• The SVG relies on voltage-source inverter topology for dynamic grid regulation.
• It continuously captures real-time load current signals, calculates the target reactive current through a high-performance DSP+FPGA dual-core controller, and drives the IGBT power bridge via high-frequency PWM modulation. It then outputs compensation current counter-phase to the reactive component of welding loads.
• It is equipped with the ADALINE adaptive linear neural network control algorithm. The equipment can autonomously learn the power grid characteristics of the welding workshop on site. Manual parameter setting by field technicians is not required, which greatly cuts the commissioning workload for workshop power renovation projects.
• The unit achieves dynamic response within 5ms and suppresses harmonics ranging from the 2nd to the 50th order. After compensation, the power factor can stay above 0.99.
• Since it adopts active current injection instead of capacitor switching for grid governance, there is no risk of parallel resonance.
• It works compatibly with various arc welders, resistance welding machines and other non-linear welding equipment.

Application Scenarios :

After-sales Service :

Q&A :

Q1: With many VFDs and solar inverters on site, harmonic distortion exceeds limits?

A1: SVG suppresses harmonics from 2nd to 50th order and purifies grid waveform, compatible with various non-linear loads.

Q2: Unbalanced three-phase current causes transformer unbalanced operation?

A2: Nengdu SVG integrates three functions: reactive compensation, harmonic suppression and three-phase imbalance correction.

Q3: Mining/glass factory has heavy dust and harsh environment, power quality devices break easily?

A3: Our SVG adopts industrial-grade components with wide-temperature design, stable operation under dusty and high-temperature harsh conditions.

Q4: Solar farm output fluctuates sharply and fails grid connection requirements?

A4: SVG smooths renewable power fluctuation, stabilizes voltage and meets grid codes.

Q5: For old plant renovation, the power room is too small for large compensation cabinet?

A5: Modular design, wall-mounted option available to save space in power distribution room.

Q6: Factory capacity expands later and compensation capacity becomes insufficient?

A6: Multiple SVG units can run in parallel for capacity expansion. No need to remove existing equipment.

Q7: What power factor can be achieved after SVG installation?

A7: The compensated power factor can stay steadily above 0.99.

Q8: Can SVG work for 690V / 480V low voltage system?

A8: Yes, we support customization for 400V,480V,690V and other voltage levels.

About Shanghai Nengdu New Energy :

Shanghai Nengdu New Energy Co., Ltd. is a China-based high-tech manufacturer headquartered in Shanghai. We focus on the R&D, manufacturing and after-sales support of power quality optimisation equipment.

Our comprehensive product portfolio includes Active Harmonic Filters (AHF), Static Var Generators (SVG), intelligent capacitors, reactive power controllers, capacitor contactors, voltage regulators, dynamic reactive power regulators and supporting energy storage systems.

We maintain standardized production workshops, professional electronic R&D labs and full-performance test facilities. All product algorithms, software, hardware and cabinet structures are developed in-house. This capability enables us to deliver custom power equipment, full turnkey projects and flexible ODM collaboration.

Our products are certified to CE, IEC, RoHS and ISO standards. We partner with energy engineering distributors across Southeast Asia, the Middle East, Europe, the Americas and Africa, with key markets such as India, Germany and Saudi Arabia.

Our in-house engineering team offers on-site power quality auditing & calculation, equipment matching and replacement, programming and commissioning guidance, alongside permanent remote after-sales technical assistance.

Shanghai Nengdu New Energy Co., Ltd.  is located at the Grand Hongqiao Headquarters Base. As a high-tech and specialized enterprise, we focus on the development and application of power electronics and green energy technologies. We specialize in power quality management products and new energy technology, integrating R&D, manufacturing, sales and after-sales service.

We own complete production equipment and systems. Our core technical team consists of postdoctoral researchers, doctors, masters and senior engineers, holding dozens of independent intellectual property rights and invention patents. With advantages in core control algorithm research, our products are widely sold across domestic markets and overseas.

We adhere to the principle of Customers First. Driven by client requirements, we provide highly competitive customized products, services and industry solutions. Supported by lean production and refined operation management, we consistently deliver reliable high-quality products to realize customer value.

Main Products: Power quality equipment, energy storage, AC/DC converter modules and smart energy systems. We provide full-chain services covering technical development, manufacturing and sales.

Application Fields: Public buildings, data centers, manufacturing, healthcare, rail transit, utility power grids, petrochemical industry, iron & steel smelting and other sectors.