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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using capacitors for reactive power compensation, the dynamic performance is poor, and it is easy to resonate with the grid

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[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 re...

Embodiment 2

[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 informati...

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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.

Description

technical field [0001] The invention relates to a SVG-based deep well non-coal mine electrified railway power supply system and a use method thereof, belonging to the technical field of mining electricity. Background technique [0002] As one of the most commonly used energy methods in the modern world, electricity is an indispensable component in the production and operation of deep wells and non-coal mines. However, in the power supply process of the deep mine non-coal mine electrified railway, many power supply links will have the problem of wasting electric energy, and the electrical equipment will also cause the loss of electric energy. [0003] One of the main reasons for the waste of electric energy is the poor voltage quality, that is, voltage waveform distortion, including voltage flicker, instantaneous overvoltage, harmonic distortion, voltage imbalance of each phase, etc. Problems, three-phase unbalance problems are also factors that affect power quality and stab...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02J3/01H02J3/24H02J3/26
CPCH02J3/18H02J3/01H02J3/26H02J3/24Y02E40/30
Inventor 束洪春刘太文雷顺广
Owner KUNMING UNIV OF SCI & TECH
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