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Power grid zero-crossing compensation method

A power grid and zero-crossing technology, applied to electrical components, AC networks to reduce harmonics/ripples, output power conversion devices, etc., can solve problems such as current distortion and affect the quality of power grid current, to improve zero-crossing distortion, Improve the problem and reduce the effect of total harmonic distortion rate

Active Publication Date: 2020-11-17
EAST GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Based on this, it is necessary to provide a grid zero-crossing compensation method for the problem that current distortion is formed at the zero-crossing point of the grid and affects the current quality of the grid.

Method used

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Embodiment Construction

[0024] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0025] It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical", "horizontal", "left", "right", "upper", "lower", "front", "rear", "circumferential" and...

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Abstract

The invention relates to the technical field of rectification converters, and discloses a power grid zero-crossing compensation method. According to the method, the three-phase power grid zero crossing point area voltage judgment is added on the basis of traditional voltage outer loop control bus voltage and current inner loop control inductive current. The method comprises the steps of judging whether the three-phase power grid crosses zero or not is judged by collecting the voltage of the three-phase power grid and judging whether the voltage of the three-phase power grid is in a zero crossing point area or not; and when judging that any phase of power grid in the three-phase power grids crosses zero, recording the first modulation voltage of the phase of power grid and clamping the first modulation voltage to zero, and reversely compensating the voltage value of the first modulation voltage recorded before zero setting for the second modulation voltage and the third modulation voltage of other non-zero-crossing two-phase power grids. By compensating the three-phase power grid at the zero crossing point, the problem that the grid-side current lags behind the grid-side voltage dueto the internal resistance of a boost inductor and the delay of an inductive current control signal in a hardware circuit can be solved, and the current quality is improved.

Description

technical field [0001] The invention relates to the technical field of rectifier converters, in particular to a zero-crossing compensation method for a power grid. Background technique [0002] As a three-level rectifier, the three-phase Vienna rectifier is widely used in communication power supply, uninterruptible power supply, wind power generation and other occasions. Compared with the traditional two-level rectifier, it has higher power density, so it can reduce the volume and make the product lighter when applied in the product; in addition, its unique structure makes the stress of the switch tube half of the DC side bus voltage, so It is more suitable for use in high-power and high-voltage output, and it avoids the problem of bridge arm through-through, and at the same time avoids the problem of current quality deterioration caused by setting dead time, and indirectly improves its reliability. In the conventional control method of the three-phase Vienna rectifier, whe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02M1/12H02M7/12H02M1/08H02M1/06
CPCH02J3/01H02M1/12H02M7/12H02M1/08H02M1/083H02M1/06Y02E40/40
Inventor 聂欢高钢张凯涛
Owner EAST GRP CO LTD
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