Jinneng Project in Wuhan Rail Transit

Characteristics of the Rail Transit Industry:

Harmonics in rail transit primarily originate from rectifiers and inverter devices in vehicle traction power supply systems, followed by DC power supply units, lighting, elevators, display screens, air conditioning, drainage systems, and other equipment. These harmonics mainly consist of the 5th, 7th, 11th, and 13th orders, with some presence of 3rd-order harmonics. Harmonics deplete the reactive power reserve in the system, increase line losses, affect the reliable operation of relay protection and automatic control devices, reduce the operational safety of electrical equipment, and cause electromagnetic interference with communication and signaling systems.

Potential Issues You May Encounter:

1.Low power factor, rendering traditional reactive power compensation devices unable to operate or prone to burnout.

2.Fluctuating loads.

3.High harmonic current distortion rates, affecting the reliable operation of relay protection and automatic control devices.

4.Severe three-phase imbalance in the power supply grid.

Case Study:

Jinneng power capacitors and active power filters have been successfully operating for one year in the equipment rooms of Wuhan Rail Transit, demonstrating excellent performance and ensuring the safety of rail transit operations.

Our Solutions:

1.Utilize Jinneng APF active power filters to reduce the content of higher-order harmonics.

2.Employ Jinneng SVG dynamic reactive power generators to dynamically supply reactive power to each phase of the system while simultaneously mitigating harmonics of various orders.

3.Implement dynamic safety compensation devices, designed with appropriate capacitor and reactor parameters based on the system's harmonic conditions. These devices improve the power factor through reactive power compensation, enhancing the power quality of the rail transit power supply system.

4.The dynamic safety compensation devices adopt a hybrid compensation method combining three-phase independent compensation and three-phase common compensation to meet the compensation requirements for system three-phase imbalance.