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A control method of cascaded h-bridge type distribution network arc suppression device

A device control and distribution network technology, applied in the direction of circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. Problems such as slow response speed and complicated parameter adjustment can achieve the effects of reducing calculation burden, fast dynamic response speed, and improving steady-state performance

Active Publication Date: 2019-09-13
SHANGHAI HOLYSTAR INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional control method requires coordinate transformation, and the parameter adjustment is complicated, which needs to be adjusted in real time according to the state of the system
Moreover, the dynamic response speed is slow, which cannot meet the dynamic performance requirements of the arc suppression device

Method used

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  • A control method of cascaded h-bridge type distribution network arc suppression device
  • A control method of cascaded h-bridge type distribution network arc suppression device
  • A control method of cascaded h-bridge type distribution network arc suppression device

Examples

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Embodiment 1

[0080] In this example, if Figure 4 As shown, a 10kV distribution network model containing cascaded H-bridge arc suppression devices is built using MATLAB / Simulink software to test the performance of the control method for cascaded H-bridge arc suppression devices. The test results show that this method has fast dynamic response speed, good stability performance, no need to adjust parameters, and can achieve good results under different fault resistance conditions. In the distribution network model, E X (X stands for A, B, C three-phase serial number, the same below) is the 10kV infinite system power supply; U X is the bus phase voltage; U 0 is the zero-sequence voltage of the distribution network; C X and r X are the capacitance and resistance of the distribution network to ground, respectively, and the parameters are 7μF and 30kΩ; I Xg is the ground current of the distribution network; I XZ is the injection current of the arc suppression device; L and R are the filter...

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Abstract

The invention relates to a control method of a cascade H-bridge type distribution network arc suppression device. The control method includes the following steps that S1, electric quantities of distribution network and an arc suppression device are collected in real time, and a reference value of arc suppression device injection current is calculated according to a ground parameter of the distribution network; S2, according to the reference value of the injection current, the electric quantities and a parameter of the arc suppression device, an optimal output level of the arc suppression device of the current sampling period is calculated; S3, according to the optimal output level, a duty ratio of the optimal output level is calculated; and S4, according to the optimal output level and theduty ratio, an optimal switch state combination is obtained, and a switch signal is output to H-bridge units. According to the control method of the cascade H-bridge type distribution network arc suppression device, the dynamic response is fast, the steady-state performance is good, and the realization in the digital control system is easy; the parameter adjustment is not required, the functionsof fault current compensation and arc reignition suppression can be realized in the case of different fault resistors, the off and on time of each H-bridge unit is balanced, the situation of local overheating caused by the fact that the switch loss of part H-bridge units increases due to frequent breaking.

Description

technical field [0001] The invention relates to the field of converter control, in particular to a method for controlling an arc suppression device of a cascaded H-bridge distribution network. Background technique [0002] The cascaded H-bridge converter has a series of advantages such as large output power capacity, low switching frequency, small output harmonics and good electromagnetic compatibility, and has received more and more attention. At present, cascaded H-bridge converters have been used in the field of arc suppression for distribution network faults, and a cascaded H-bridge arc suppression device for distribution network has been developed. Since the three phases of the cascaded H-bridge distribution network arc-suppression device are star-connected, and the neutral point is grounded, the three-phase decoupling of the arc-suppression device is decoupled. The control method of the arc-suppression device is actually a single-phase cascaded The H-bridge converter ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/08
Inventor 郭谋发邱伟强高伟洪翠杨耿杰
Owner SHANGHAI HOLYSTAR INFORMATION TECH
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