Novel design method for direct-current inductance of current source converter

Abstract

The invention provides a novel design method for direct-current inductance of a current source converter. The method comprises the following steps: 1, calculating parameters of a system, comprising a converter alternating-voltage amplitude value Vtm, a converter alternating-current phase-A voltage initial phase gamma, a modulation ratio m and a reference current angular displacement initial value theta 0; 2, calculating the maximum value of a volt-second constant according to volt-second balance principles; 3, considering influences of different modulation methods for ripples, finding possible maximum volt-second constants, and taking the maximum value in the possible maximum volt-second constants as C; 4, calculating the direct-current inductance. The novel design method for the direct-current inductance of the current source converter disclosed by the invention overall considers influences of various factors, and design results are very accurate; compared with the traditional design method, the design value of the direct-current inductance can be greatly reduced under same design requirements of the direct-current current ripples to greatly reduce the cost and the size of the direct-current inductance.

Description

technical field [0001] The invention relates to a parameter design of a converter, in particular to a novel design method for a DC inductance of a current source converter. Background technique [0002] The current source converter is a PWM converter that uses reverse resistance switching devices and uses DC inductors as DC energy storage components. It has natural short-circuit protection capabilities and high reliability. It is used in wind power generation, motor drive and other fields have a wide range of applications. With the development and use of the new reverse-resistance switching device RB-IGBT, the switching frequency of the current source converter can be greatly increased, thereby improving its dynamic performance, reducing its size and cost, and its application prospects. will be wider. In this case, it is very necessary to study the design method of the DC inductance of the current source converter. [0003] The DC inductance of the current source converte...

AI Technical Summary

Problems solved by technology

The minimum value of the DC inductance should make the maximum ripple of the DC current meet the design requirements, but too large a DC inductance will result in high cost and poor dynamic response speed

The design method of the traditional current source converter DC inductance is relatively rough. Although it is also designed from the maximum ripple, they do not carefully analyze the change of the DC current ripple in a single sampling period, nor consider The influence of system parameters and modulation methods on DC ripple leads to a larger final design result, which is detrimental to the cost, volume and dynamic performance of the entire system

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