Features: Transient Impact Loads require compensation devices to have extremely high response speed and compensation accuracy, along with strong capability to withstand impact currents.
Project background: SINOPEC SHENGLI produces 23.4512 million tons of crude oil annually, with oil extraction plants operating within a 690V distribution system. The oil pumps are driven by motors and variable frequency drives (VFDs). During operation, oil pumps generate a significant amount of harmonic currents, which can reduce power supply reliability, increase line losses, and cause malfunctions in the oil pumps. In severe cases, these harmonic currents can prevent equipment from functioning properly.
Before the commissioning of the 690V AHF, a power quality analyzer was used to detect the harmonic data on the system side. The results are illustrated in Figures 7 and 8. The data clearly indicates severe distortion in the harmonic current waveform, with a total harmonic distortion (THDi) of 33.69%, that against the national standard outlined in "Power Quality - Harmonics in Public Power Systems" (GB/T 14549-93).
After installing the 690V 100A AHF, the power quality analyzer was used again to conduct the same tests on the system. The results indicate that, following the installation of the active filter device, the current harmonic distortion in the system decreased from THDi: 33.69% to THDi: 11.92%. This demonstrates significant improvement, with the oil pumps operating smoothly, free from malfunctions or shutdown incidents.
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