Flexible arc extinguishing method for power distribution network based on single direct current source cascade H-bridge converter

A technology of converters and DC sources, applied in the direction of emergency protection circuit devices, electrical components, circuit devices, etc. used to limit overcurrent/overvoltage, can solve problems such as failure to suppress fault currents, and achieve optimal transient performance , DC side voltage balance, the effect of stability control

Inactive Publication Date: 2019-12-10
FUZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the arc suppression process, due to factors such as line loss and current limiting resistance, the DC side voltage of the cascaded H-bridge converter shows a downward trend, which cannot meet the demand for suppressing the fault current for a long time

Method used

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  • Flexible arc extinguishing method for power distribution network based on single direct current source cascade H-bridge converter
  • Flexible arc extinguishing method for power distribution network based on single direct current source cascade H-bridge converter
  • Flexible arc extinguishing method for power distribution network based on single direct current source cascade H-bridge converter

Examples

Experimental program
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Effect test

Embodiment 1

[0106] In this example, if figure 2 As shown, a 10kV distribution network model containing three-phase cascaded H-bridge converters is built using MATLAB / Simulink software to test the performance of the distribution network flexible arc suppression method based on a single DC source cascaded H-bridge converter . The test results show that this method has high control precision and outstanding dynamic performance, and can quickly and effectively suppress the fault phase voltage, while the DC side voltage can maintain balance and stability. In the distribution network model, (X stands for A, B, C three-phase serial number, the same below) is the 10kV infinite system power supply; is the bus phase voltage; is the zero-sequence voltage of the distribution network; C X and r X They are the ground capacitance and leakage resistance of the distribution network, and the parameters are 7μF and 30kΩ; Z X Indicates the line impedance; with are the load current and the groun...

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Abstract

The invention relates to a flexible arc extinguishing method for a power distribution network based on a single direct current source cascade H-bridge converter. The method comprises the steps of S1,recognizing a fault phase of a grounding fault, enabling a cascade H-bridge converter of the fault phase to be connected with a power distribution network, enabling a cascade H-bridge converter of a non-fault phase to be disconnected with the power distribution network, and initializing parameters of a quasi-PR controller; S2, collecting and comparing a difference value between a fault phase voltage value and a reference value, obtaining an injection current reference value of the cascade H-bridge converter through the quasi-PR controller, and calculating an optimal output level; S3, obtainingan on-off state combination according to the optimal output level, and sending the on-off state combination to the corresponding H-bridge unit; S4, after the preset time delay, cutting off the current-limiting resistor, and adjusting the parameters of the quasi-PR controller; S5, collecting direct-current side voltage of the cascade H-bridge converter in real time, and connecting a direct-currentsource with an H-bridge unit after the voltage drops to a threshold value; and S6, gradually reducing the injection current after the preset time is reached, and judging and isolating the permanent single-phase grounding fault.

Description

technical field [0001] The invention relates to a flexible arc suppression method for a distribution network based on a single DC source cascaded H-bridge converter. Background technique [0002] With the development of the distribution network, line cable and equipment flexibility can effectively improve the power supply capacity and solve some bottleneck problems in the development process of the traditional distribution network, but at the same time make the active component and harmonic component of the ground fault current The proportion increased significantly. The traditional arc suppression device based on the arc suppression coil can only compensate the fundamental wave component of the capacitive reactive power in the ground fault current, which can no longer meet the safety and reliability requirements of the distribution network. , Equipment insulation brings potential safety hazards. [0003] The cascaded H-bridge converter has a series of advantages such as l...

Claims

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Application Information

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IPC IPC(8): H02H9/08H02H7/26
CPCH02H7/26H02H9/08
Inventor 郭谋发蔡文强邱伟强高伟洪翠杨耿杰
Owner FUZHOU UNIVERSITY
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