Application of the Xinshida AS800 Inverter in Natural Gas Pipeline Transportation in the Oil and Gas Industry
2025-06-03
Application of the Xinshida AS800 Inverter in Natural Gas Pipeline Transportation in the Oil and Gas Industry
Project Background
The Xindashida AS800 series high-power, high-voltage frequency converters have successfully ensured the smooth commissioning of a natural gas project in Iraq.
Located in the northeastern part of Basra, Iraq, near the Iranian border, this project has a daily natural gas processing capacity of 130 million cubic feet. As a key green and environmentally friendly project with significant benefits for local livelihoods in Iraq, once operational, it will substantially reduce the flaring of associated gas from oil fields, playing a crucial role in boosting local natural gas supplies, protecting the environment, and cutting carbon emissions. The natural gas and liquefied petroleum gas produced by this project can meet the electricity needs of up to 3 million households locally, significantly enhancing Iraq’s energy security and contributing to improved living standards for the local population.
Customer needs
During natural gas pipeline transportation, as pressure and temperature decrease, liquid hydrocarbons condense in the transmission and distribution pipelines and accumulate in low-lying sections of the pipeline, thereby affecting normal gas flow and even causing pipeline blockages.
On the one hand, this has reduced the pipeline's transportation capacity; on the other hand, it has resulted in the exported natural gas failing to meet the standards.
For the above-mentioned situation, molecular sieve dehydration and propane refrigeration are typically employed to centrally treat natural gas for dehydration and hydrocarbon removal.
The load type for this project is a low-temperature propane refrigeration main motor used for refrigeration in natural gas processes. The load power is 11 kV, 8,000 kW.
When a load is directly started at power frequency, the inrush current is high, placing significant demands on the grid’s capacity and causing a drop in grid voltage that may lead to malfunctions in other equipment connected to the same grid.
Xinshida Solution
Scheme advantages
1. High-voltage variable frequency single-stage solution
As shown in the figure, QF1 and QF2 are vacuum circuit breakers, and KM is a vacuum contactor. When the equipment is operating normally, QF1 and QF2 are closed, and the high-voltage pre-charge of the high-voltage variable-frequency input line is performed. After the pre-charge is completed, KM closes, at which point the variable-frequency drive can be started at any time.
2. High-voltage variable-frequency pre-charge function
When a phase-shifting transformer is connected to the power grid under no-load conditions, the core saturation causes a strong magnetizing current to flow, with peak values potentially reaching 8 to 11 times the rated current. Pre-charging, however, allows the transformer to be fully charged, thereby reducing the inrush current during equipment startup and protecting both the high-voltage variable frequency drive and the equipment itself. At the same time, pre-charging also enhances the overall operational stability and accuracy of the equipment, lowering the failure rate and maintenance costs.
3. Perfect Harmonic-Free Inverter
The multiplexing of the secondary winding of the input transformer reduces the pollution of the power supply caused by higher-order harmonic currents, complying with both the GB 14549-93 standard and the IEEE Std 519-1992 power quality standard. There is no need to install additional power factor correction or harmonic suppression devices—this truly makes it a “perfect, harmonic-free inverter.”
Enter the three-phase current waveform.
Input the total harmonic distortion of three-phase current.
Parameters & Certification
Basic parameters of the high-voltage variable frequency drive model AS800-6300-T110-PCN:
This equipment has passed the type-test conducted by Tianjin Tianchuan Electric Control Equipment Testing Co., Ltd.
Associated products
AS800 High-Voltage Frequency Converter
Project Results
The Xindashida solution employs high-voltage variable-frequency starting, with a starting current less than twice the rated current, significantly reducing the demand on grid capacity.
The successful application of the Xindada AS800 series high-power, high-voltage frequency converters in Iraq’s natural gas project once again demonstrates Xindada’s outstanding performance and reliability in the international market.
