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Method and device for determining steady-state current value of full-control current type converter

A steady-state current and determination method technology, applied in the electrical field, can solve problems such as large errors between calculation results and actual values, and achieve the effect of small iterative calculations

Pending Publication Date: 2022-07-01
GUIZHOU POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This makes the calculation result and the actual value have a large error, especially in the case of large harmonics

Method used

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  • Method and device for determining steady-state current value of full-control current type converter
  • Method and device for determining steady-state current value of full-control current type converter
  • Method and device for determining steady-state current value of full-control current type converter

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Embodiment Construction

[0055] In order to make the concept and idea of ​​the present invention more clearly understood by those skilled in the art, the present invention will be described in detail below with reference to specific embodiments. It should be understood that the embodiments presented herein are only a part of all possible embodiments of the invention. After reading the description of the present invention, those skilled in the art have the ability to make improvements, transformations, or replacements on part or the whole of the following embodiments, and these improvements, transformations, or replacements are also included in the scope of protection of the present invention.

[0056]In this document, the terms "embodiment", "this embodiment", "an embodiment", "one embodiment" do not mean that the description applies to only one particular embodiment, but rather that the description may also apply to in one or more other embodiments. It should be understood by those skilled in the ar...

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Abstract

The invention provides a method and a device for determining a steady-state current value of a full-control current type converter. The method comprises the following steps: determining an average value of DC voltage, load resistance and ripple current in a switching period; and determining a steady-state current value according to the numerical values. The method further comprises the following steps: setting an initial current value output by the direct current side of the full-control current type converter; calculating an intermediate current value according to a formula; judging whether the absolute value of the difference between the intermediate current value and the initial current value is smaller than a cut-off adjustment range; if the absolute value is larger than the cut-off adjustment range, replacing the initial current value with the intermediate current value, calculating a new intermediate current value according to a formula, and judging whether the absolute value of the difference between the new intermediate current value and the initial current value is smaller than the cut-off adjustment range or not; and if the absolute value is smaller than the cut-off adjustment range, taking the intermediate current value as a steady-state current value. The determination method and device have the advantages of being small in iterative calculation amount and small in error.

Description

technical field [0001] The invention relates to the field of electrical technology, in particular to a method and a device for determining a steady-state current value of a fully-controlled current-type converter. Background technique [0002] The fully-controlled current-mode converter has the advantages of continuously adjustable current, strong ability to limit short-circuit current, high power quality and high power factor on the AC side, and is suitable for application scenarios of high-current power supply and transmission. [0003] In order to design the parameters and protection settings of the main circuit, it is necessary to calculate the steady-state electrical quantity of the converter. The fully-controlled current-mode converter is a multivariable nonlinear system, and differential equations are used to describe the relationship of electrical quantities. Generally speaking, the Newton-Raphson iteration method can be used to solve the solution of the differentia...

Claims

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Application Information

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IPC IPC(8): H02M7/12H02M1/12H02M1/14
CPCH02M7/12H02M1/126H02M1/14
Inventor 曾华荣马晓红杨旗文屹许逵吕黔苏殷蔚翎陈沛龙
Owner GUIZHOU POWER GRID CO LTD
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