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The power factor of a certain power supply station increased to more than 0.98 after using SVG,
A power supply station currently operates two main transformers with a total capacity of 6,300 kVA, delivering over 20 million kWh of electricity annually. The station manages one 18.6-kilometer 35kV line and six 10kV lines totaling 312.3 kilometers, serving 27,905 residential customers. The 10kV busbar is currently equipped with
A 2000kvar SVG unit. The power supply system structure is shown in the figure.
During peak electricity consumption periods, users experience low power factor levels, with the grid's power factor remaining below 0.2, resulting in undercompensation. Conversely, during off-peak hours, overcompensation occurs. The significant fluctuations in reactive power cause voltage instability in 10kV busbars, posing safety risks to electrical installations. The power supply station originally installed two 0.6MVAR reactive compensation capacitors, but one unit has been damaged. Moreover, these capacitors lack stepless regulation capability for reactive power adjustment during switching operations.
After extensive investigations, the power company leadership ultimately selected SVG (±2000kvar/10kV) in September 2011 to provide reactive power compensation and harmonic mitigation for the grid. The device was connected to the power supply station, and during the joint commissioning period, it did not cause any adverse effects on the normal operation of the grid.
SVG can operate either in parallel with the original capacitor cabinet or independently. Thanks to its continuous regulation capability of both capacitive and inductive characteristics, the SVG installation not only boosts the power factor from below 0.2 to over 0.98, but also resolves the 'overcompensation' issue in existing capacitor compensation systems.
The SVG system demonstrates reliable performance, comprehensive functionality, and high automation with user-friendly operation. It enables real-time monitoring of operational parameters and fault detection, providing automatic protection against malfunctions. Compared to conventional reactive power compensation equipment, this solution offers significant advantages. Calculations show the user achieves annual electricity cost savings exceeding 1 million yuan. Post-compensation optimization further reduces grid losses while improving voltage quality.
The diagram shows the reactive power curve before SVG installation and the power factor curve after SVG installation.
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