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Harmonic characteristics of rail transit power distribution system

Click: Time:2022-12-21 15:10:54

Rail transit harmonics mainly come from the rectifier and inverter devices of vehicle traction power supply, followed by DC power supply complete sets, lighting, elevators, display screens, air conditioning, drainage and other devices, mainly based on 5, 7, 11, 13 harmonics, but also contains some 3 harmonics. The reactive power reserve in the harmonic consumption system increases the line loss, affects the reliable operation of relay protection and automatic control devices, reduces the operational safety of the electrical equipment, and produces electromagnetic interference on communication and signals. Harmonics can also have a destructive effect on other reactive power compensation devices in the line, while the reactive power compensation device also amplifies harmonics, forming a vicious circle.

 

Detailed solutions for rail transit: rail transit harmonics mainly come from the rectifier and inverter devices of vehicle traction power supply, followed by DC power supply complete sets, lighting, elevators, display screens, air conditioning, drainage and other devices, mainly based on 5, 7, 11, 13 harmonics, but also some 3 harmonics. The reactive power reserve in the harmonic consumption system increases the line loss, affects the reliable operation of relay protection and automatic control devices, reduces the operational safety of the electrical equipment, and produces electromagnetic interference on communication and signals. Harmonics can also have a destructive effect on other reactive power compensation devices in the line, while the reactive power compensation device also amplifies harmonics, forming a vicious circle.

The user value of harmonic governance

Rail transit, especially subway power supply system, has very strict requirements for power supply reliability, and harmonics are the main cause that threatens its power supply reliability. The use of active filters can effectively control harmonics, minimize the damage of harmonics to the power supply system, and ensure the safe and stable operation of rail transit. At the same time, after harmonic filtering, the harmonic loss of the system is reduced, and the original capacitor compensation equipment can be used normally, further reducing the system loss

  

Problems you may be experiencing?

1. The power factor is low, and the traditional reactive power compensation device cannot be put in or often burned;

2. Load changes

2. High harmonic current distortion rate, affecting the reliable operation of relay protection and automatic control devices;

3. The three-phase imbalance of the power supply network is relatively serious.

  

Our Solutions:

1. The active filtering device ESBEL AHPF is installed on the 400V two-section bus of the step-down substation for filtering to reduce the content of high-order harmonics;

2. The ESBELmtr dynamic reactive power generator is used to provide reactive power to each phase of the system in the dynamic form, and at the same time control the harmonics of the system;

3. The dynamic safety compensation device ESBELmitr is adopted to reasonably design the parameters of the capacitor and reactor according to the harmonic situation of the system, improve the power factor through reactive power compensation, and improve the power quality of the rail transit power supply system;

4. The dynamic safety compensation device MVTS adopts a mixed compensation method of three-phase sub-complement and three-phase co-complement to meet the compensation requirements of three-phase imbalance of the system.


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