Unlock New Heights in Power Quality: Innovative Integration of SVG and Multiple Superimposition Technology

Amid the global drive towards carbon neutrality, the efficient operation and green transformation of power systems have become core priorities. As a key device for improving power quality, the Static Var Generator (SVG) is breaking through traditional bottlenecks through technological innovation, offering a cutting-edge solution for high-voltage, large-capacity power transmission scenarios. Among these advancements, the SVG topology based on multiple superimposed converters stands out with its exceptional harmonic suppression capabilities and power factor correction performance, emerging as a cornerstone of power grid upgrading.

I. SVG: The Guardian of Power Quality in the Carbon Neutrality Era

In the process of energy transition, the large-scale integration of renewable energy sources such as wind and solar power has exacerbated issues related to reactive power imbalance in power grids. This not only increases line losses and reduces voltage stability but also severely limits energy utilization efficiency, running counter to carbon neutrality goals. The advent of SVG has provided an efficient solution to this challenge.

Through the flexible control of fully controlled devices, SVG can quickly respond to the grid's reactive power demands, real-time compensate for reactive power losses, and fundamentally improve power quality. Compared with traditional reactors and capacitors, SVG boasts a smaller footprint, lower losses, and faster dynamic response, making it ideally suited to the fluctuating characteristics of renewable energy generation. In terms of power factor correction, SVG can rapidly elevate the grid's power factor to an optimal level, reducing ineffective power transmission and alleviating carbon emission pressures on the generation side. This provides a solid foundation for the low-carbon operation of power systems. Whether in industrial settings with high-power equipment or urban distribution networks integrating renewable energy, SVG is driving the realization of carbon neutrality goals by optimizing energy utilization efficiency.

II. Limitations of Traditional SVG: New Breakthroughs with Multiple Superimposition Technology

While traditional SVG based on three-phase bridge circuits offers flexible control, it has gradually revealed shortcomings in high-power, large-capacity applications. Its high switching frequency leads to increased turn-on losses and reduced efficiency, while excessive harmonic content further degrades grid power quality and threatens the safe and stable operation of power equipment. These limitations prevent traditional SVG from meeting the demands of current high-voltage and ultra-high-voltage power transmission systems, restricting its potential in supporting carbon neutrality strategies.

The emergence of multiple superimposition technology has opened up new avenues for SVG performance enhancement. This technology superimposes the output voltage waveforms of multiple converter groups after phase-shifting processing, forming a multi-level stepped wave. As the number of superimposed layers increases, the sinusoidal quality of the output waveform improves significantly, and harmonic content is drastically reduced. SVG based on this technology not only effectively addresses the harmonic pollution issues of traditional equipment but also avoids technical challenges such as voltage balancing in series-connected fully controlled devices and current sharing in parallel configurations. It reduces switching frequency and device losses while improving system operational efficiency. This innovative design enhances SVG's adaptability to high-voltage, large-capacity scenarios, providing more stable and efficient technical support for power factor correction.

III. SVG Topology Innovation: Dual Empowerment from Conventional Transformers and Zigzag Transformers

The core of SVG topology based on multiple superimposition technology lies in the optimized combination of transformers and converters. The application of both conventional transformers and zigzag transformers has injected dual impetus into SVG performance improvement.

Multiple superimposed SVG combined with conventional transformers achieves phase difference adjustment through transformers with different connection groups. When paired with multi-level converters, this further increases the equipment's capacity and voltage rating. This topological structure can effectively suppress specific harmonic orders, and with the assistance of DC-side reactors or capacitors, significantly reduces the risk of grid harmonic pollution, optimizing SVG's power factor correction performance. In applications such as industrial enterprises and large commercial complexes, SVG with this topological design can accurately match load demands, optimize power distribution, reduce electricity costs for users, and contribute to energy conservation and carbon reduction across society.

In contrast, multiple superimposed SVG integrated with zigzag transformers demonstrates exceptional harmonic suppression capabilities. Through the collaborative operation of multiple single-phase bridge circuits and zigzag transformers, this topology enables multi-level output, suppressing various high-order harmonics and even eliminating harmonic interference at specific frequencies. Its unique phase adjustment mechanism ensures that the fundamental wave signals output by each converter remain consistent, while high-order harmonics cancel each other out, resulting in output current harmonic content well below national standards. This high-performance SVG finds applications in renewable energy power plants and high-voltage transmission lines, effectively improving grid power quality, enhancing power factors, ensuring the efficient grid connection and stable transmission of renewable energy, and providing strong support for energy structure adjustment under carbon neutrality goals.

IV. Wide-Ranging Applications of SVG: Driving Power Quality Upgrades Across Industries

Driven by carbon neutrality strategies, SVG's application scenarios are continuously expanding, from traditional industrial production to emerging renewable energy sectors. In wind and solar power plants, SVG real-time compensates for reactive power, improves the power factor of the plants, ensures stable grid connection of electricity, reduces curtailment of wind and solar energy, and increases the utilization rate of renewable energy. In urban distribution networks, the massive integration of electric vehicle charging piles and distributed energy storage equipment has intensified grid load fluctuations. SVG can quickly respond to voltage changes, suppress harmonic pollution, and ensure the stability of residential and commercial power supply. In heavy industries such as steel and chemicals, the startup and shutdown of high-power equipment generate significant reactive power impacts. SVG can effectively absorb these impactful reactive power loads, improve power factors, reduce equipment losses, and enhance production efficiency while cutting carbon emissions.

In the future, with the continuous advancement of technologies such as multiple superimposition technology and new power electronic devices, SVG will develop towards higher voltage, larger capacity, and greater efficiency. Its performance in power factor correction and harmonic suppression will be further enhanced, providing stronger support for the green transformation and efficient operation of power systems. As a core device for power quality improvement, SVG will continue to help industries reduce energy consumption and carbon emissions, becoming an indispensable force in the carbon neutrality era and promoting the construction of a clean, low-carbon, safe, and efficient energy system.

At HengRong Electrical, we understand that every detail in power control matters. From advanced product design to innovative filtering solutions, we are committed to delivering reliable, efficient, and future-ready technologies. By choosing Hengrong, you gain more than just products — you gain a trusted partner dedicated to helping your business achieve smarter, safer, and greener operations.

www.hengrong-electric.com