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Simplified Solution Method for Transient Response of DC System Feed-in DC

A DC system and transient response technology, applied in data processing applications, design optimization/simulation, special data processing applications, etc., can solve problems such as commutation failure of DC system inverters, reduce complexity, simplify simulation, The effect of simplification

Active Publication Date: 2020-06-16
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After a symmetrical or asymmetrical fault occurs in the AC system on the inverter side, the inverter of the DC system may fail to commutate

Method used

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Embodiment Construction

[0033] Below in conjunction with accompanying drawing and specific embodiment, the present invention will be further described:

[0034] The present invention is a simplified solution method for the transient response of a DC system fed into a DC power grid, which simplifies the rectification-side AC power supply, converter transformer, and converter of a high-voltage DC transmission system into a DC voltage source with variable amplitude, and utilizes The equivalent voltage is obtained from the firing angle and the AC voltage on the rectifier side, which reduces the complexity of solving the transient response of the DC system; the details are as follows:

[0035] 1) The state equation of the DC main equipment system is formed as follows:

[0036] Simplify the AC power supply, converter transformer and converter on the rectification side into a variable-amplitude DC voltage source; combine other components of the DC main equipment system, namely the inverter side converter tr...

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Abstract

The invention discloses a simplified solving method used for a transient response of a direct-current system of a direct-current feed-in power grid. The method can be used in mixed simulation of alternating-current and direct-current systems, and a result can serve as a basis of judgment of commutation failure of the direct-current system; in the method, a mathematic model of a high-voltage direct-current power transmission system includes a model of a direct-current main device system and a model of a direct-current control system; a converter transformer, a current converter, a direct-current filter and a direct-current line are considered in the direct-current device; the direct-current control system relates to different control modes of the current converter; the model on a rectifier side in the direct-current main device system is simplified, the whole rectifier side is represented as a variable-amplitude direct-current power supply, and a voltage is a function of a control angle; and by performing transient simulation on the simplified direct-current device system and control system, a full-cycle response of the high-voltage direct-current power transmission system is obtained.

Description

technical field [0001] The invention belongs to the field of power system simulation and calculation, and in particular relates to a simplified solution method for transient response of a direct current system fed into a power grid. Background technique [0002] The high-voltage DC transmission system based on thyristor control consists of two parts: DC equipment system and DC control system. The DC equipment system generally includes converter transformers, converters, DC filters, smoothing reactors, and DC transmission lines, etc. The DC control system is formed by the control logic of the rectification side and the inverter side. Due to the physical characteristics of the DC system, there is a conduction or commutation process on both the rectifier side and the inverter side. According to the response of the DC main equipment system, the DC control system forms the trigger pulse moment of the converter according to its control logic, and the converter completes the autom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q50/06G06F30/20
CPCG06F30/20G06Q50/06Y02E60/00
Inventor 李崇涛杜正春易杨陈睿龙霏
Owner XI AN JIAOTONG UNIV