SVG-based deep well non-coal mine electrified railway power supply system and use method thereof

A technology for electrified railways and power supply systems, which is applied to AC networks to reduce harmonics/ripples, reduce/prevent power oscillations, adjust/eliminate/compensate reactive power, etc., and can solve problems such as grid resonance and poor dynamic performance. Achieve the effect of strong adaptability, fast governance speed and high reliability

Pending Publication Date: 2022-05-31

KUNMING UNIV OF SCI & TECH

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AI-Extracted Technical Summary

Problems solved by technology

However, when using capacitors for reactive power compensation, the ...

Method used

Because Us2 and R are all positive in the formula, so angle δ is proportional to reactive power Q, and when δ was less than 0, SVG input inductive reactive power to system; when δ was greater than 0, SVG input capacitive power to system Reactive power, through reactive power compensation to maintain power balance and improve voltage stability.

The basic reali...

Abstract

The invention relates to an SVG-based deep well non-coal mine electrified railway power supply system and a use method thereof, and belongs to the technical field of mining industry electricity. The system is composed of an alternating current power supply system, an SVG device, a traditional LCC converter station and a traction network power transmission system. According to the method, high-power-factor operation of the deep-well non-coal-mine electrified railway power supply system can be achieved, the transient stability of the power grid voltage is effectively improved, voltage treatment of the traction network of the deep-well non-coal-mine electrified railway power supply system is achieved, and the method is higher in reliability, free of harmonic pollution and higher in environment adaptability.

Application Domain

Polyphase network asymmetry elimination/reductionReactive power adjustment/elimination/compensation +3

Technology Topic

Automotive engineeringProcess engineering +9

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Examples

Experimental program(2)

Example Embodiment

[0058] Embodiment 1: apply the present invention in PSCAD, build as figure 2 The simulation model of the deep well non-coal mine electrified railway power supply system with dynamic SVG reactive power compensation device is shown. The voltage level of the AC power supply system is 115kV. is 0.01Ω, the moment of failure is 1s, the duration is 1s, and the sampling rate is 20KHz. The specific process of implementation is as follows:

[0059] 1. When a three-phase ground fault occurs on the AC side, the Figure 4 and Image 6 It can be seen that the DC voltage drops instantly, and the system current rises rapidly. At this time, the monitoring and fault diagnosis unit detects the system current information and transmits it to the control chip.

[0060] 2. The control chip detects that the system current is too high, and the controller and the drive and protection circuit give the drive information for reactive power compensation.

[0061]3. The inverter circuit in the device receives feedback, compensates the reactive power and increases the voltage, such as Figure 4 and Figure 5 As shown, at 1s, the SVG device detects the voltage drop and compensates the reactive power until the fault ends at 2s, the DC voltage rises at this stage, and the DC voltage reaches the system requirements after the fault ends at 2s, the SVG device exits operation, and the DC The voltage returned to normal and remained stable.

[0062] According to the results obtained in this example, it is shown that the SVG-based deep well non-coal mine electrified railway power supply system traction network voltage control method and system provided by the present invention can still dynamically adjust the system reactive power when a fault occurs, effectively improving the grid voltage stability.

Example Embodiment

[0063] Embodiment 2: apply the inventive method in PSCAD, build as figure 2 The simulation model of the power supply system of the deep mine non-coal mine electrified railway with dynamic SVG reactive power compensation device shown, the voltage level of the AC power supply system is 115kV, the SVG device is connected in parallel on the AC side, and a three-phase ground fault occurs on the AC side. For the reactive power compensation capability of the method and system of the present invention in a high-resistance fault state, the transition resistance is set to 300Ω, the fault occurrence time is 1s, the duration is 1s, and the sampling rate is 20KHz. The specific process of implementation is as follows:

[0064] 1. When a three-phase ground fault occurs on the AC side, the Figure 7 and Figure 9 It can be seen that the DC voltage drops instantly, and the system current rises rapidly. At this time, the monitoring and fault diagnosis unit detects the system current information and transmits it to the control chip.

[0065] 2. Due to the high-resistance three-phase grounding fault in the system, the sudden change of the fault voltage and current becomes smaller, but the control chip still detects that the system current is too high and sends a signal, and the controller and the drive and protection circuit give reactive power compensation driver information.

[0066] 3. The inverter circuit in the device receives feedback, compensates the reactive power and increases the voltage, such as Figure 7 and Figure 8 As shown, at 1s, the SVG device detects the voltage drop and compensates the reactive power until the fault ends at 2s, the DC voltage rises at this stage, and the DC voltage reaches the system requirements after the fault ends at 2s, the SVG device exits operation, and the DC The voltage returned to normal and remained stable.

[0067] According to the results obtained in this example, it is shown that the SVG-based deep-well non-coal mine electrified railway power supply system traction network voltage control method and system provided by the present invention can dynamically adjust the system reactive power when a fault occurs, effectively improve the grid voltage stability, and be immune to high impact of faults.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Adaptable
Improve transient stability

SVG-based deep well non-coal mine electrified railway power supply system and use method thereof

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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