Optimizing Data Center Power Quality with INPSVG

With the rapid development of digital infrastructure, data centers have become critical facilities supporting industries such as finance, telecommunications, transportation, and cloud computing. As professional power quality solution provider, INPOWER has accumulated extensive experience in data center applications and provides customized power quality solutions for leading operators, cloud service providers, and data center integrators.

The China Railway Main Data Center Project, with a total investment of RMB 2.27 billion and a construction area of approximately 46,000 square meters, was designed to support core railway data storage and exchange services, including critical systems such as the 12306 railway ticketing platform.

To ensure stable and efficient operation of the data center power system, INPOWER provided a comprehensive power quality improvement solution, including reactive power compensation and harmonic mitigation equipment.

Data centers typically adopt a highly reliable power supply architecture consisting of dual independent power sources and diesel generators. The IT infrastructure is powered by online UPS systems with N+1 or 2N redundancy to ensure uninterrupted operation.

With the increasing adoption of high-frequency UPS systems, data centers face new power quality challenges. Although high-frequency UPS provides higher efficiency and lower harmonic distortion compared with traditional UPS systems, it introduces capacitive reactive power into the distribution system, which may affect system power factor and increase the risk of harmonic resonance.

Meanwhile, the cooling system of data centers often uses variable frequency drives (VFDs) to improve energy efficiency. As nonlinear loads, VFDs generate significant harmonic currents during the rectification process, resulting in increased transformer losses, voltage distortion, and potential impacts on sensitive electrical equipment.

To address reactive power fluctuations and power quality issues caused by high-frequency UPS systems, INPOWER implemented the INPSVG Static Var Generator. The INPSVG uses a fully controlled IGBT bridge converter to provide fast bidirectional compensation for inductive and capacitive reactive power, enabling continuous and stepless reactive power regulation.

The system also supports harmonic mitigation and three-phase unbalance compensation, providing comprehensive power quality improvement according to site requirements.

After the implementation of INPOWER’s power quality solution, significant improvements were achieved:

Test results before and after compensation showed significant improvements in system power quality. The power factor increased from 0.71 to 0.97, while reactive power decreased from 254.7 kvar to 61.67 kvar. Total current harmonic distortion (THDi) was reduced from 19.8% to 2.4%.

Voltage Waveform Before Compensation	Voltage Waveform After Compensation
Current Waveform Before Compensation	Current Waveform After Compensation

Under continuous 24/7 operation, the system incoming current was significantly reduced, helping lower transformer and cable losses and improve overall distribution system efficiency.

The project demonstrates how targeted power quality solutions can improve both system performance and energy efficiency in data centers with complex electrical loads.

Through advanced power quality technologies and customized solutions, INPOWER successfully improved the reliability, efficiency, and safety of the data center power distribution system.

The project demonstrates INPOWER’s capability in providing integrated power quality solutions for high-reliability applications, helping data centers achieve stable operation, energy savings, and improved electrical performance.