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Direct current side voltage balance control method of cascaded SVG based on negative sequence current and zero sequence voltage injection

A technology of DC side voltage and negative sequence current, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problem that the DC side voltage cannot be kept balanced, to avoid the failure to maintain the phase-to-phase voltage balance, simplify the formula, and control methods easy effect

Inactive Publication Date: 2022-02-18
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem that the cascaded SVG DC side voltage cannot be balanced under the unbalanced power grid in the cascaded SVG system

Method used

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  • Direct current side voltage balance control method of cascaded SVG based on negative sequence current and zero sequence voltage injection
  • Direct current side voltage balance control method of cascaded SVG based on negative sequence current and zero sequence voltage injection
  • Direct current side voltage balance control method of cascaded SVG based on negative sequence current and zero sequence voltage injection

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Embodiment 1

[0034] In this embodiment, a cascaded SVG DC side voltage balance control method based on negative-sequence current and zero-sequence voltage injection, a new control system is designed in the cascaded SVG control circuit, which uses negative-sequence current injection and zero-sequence The control strategy of mutual switching of the sequence voltage injection method maintains the voltage balance between the cascaded SVG phases, including the overall voltage outer loop of the DC side, the positive sequence negative sequence decoupling current inner loop, the negative sequence current injection module, the zero sequence voltage injection module and the SPWM module, And a comprehensive design is carried out to ensure the coordinated operation of the modules. The specific steps are:

[0035] Step 1. The main circuit of the three-level star cascaded SVG is as follows figure 1 As shown, first measure the DC side voltage of each cascaded SVG three-phase H-bridge, and calculate the ...

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Abstract

The invention discloses a direct current side voltage balance control method of a cascaded SVG based on negative sequence current and zero sequence voltage injection, and belongs to the technical field of power electronics and control thereof. The method comprises the following steps: firstly, subtracting a three-phase DC side voltage feedback value from an average value, then carrying out PI regulation and Clark coordinate transformation to obtain a three-phase power deviation value, and calculating power deviation generated by an injected negative sequence current and a zero sequence voltage in three phases, so that the power deviation and the original power deviation are mutually counteracted to achieve DC side voltage balance, and further an expression of the negative-sequence current and the zero-sequence voltage required to be injected is calculated. When the unbalance degree of the power grid is low, the zero-sequence voltage injection method is adopted, inter-phase voltage balance can be maintained and negative-sequence current can be compensated, when the unbalance degree of the power grid is high, the negative-sequence current injection method is adopted, and inter-phase voltage balance can still be maintained when the unbalance degree is large.

Description

technical field [0001] The present invention relates to the technical field of power electronics and its control, more specifically, to a DC side voltage balance control method of a cascaded SVG based on negative-sequence current and zero-sequence voltage injection. Background technique [0002] Electric energy is a very important energy in today's society. The development of industrialization and modernization is inseparable from electric energy. Therefore, the quality of electric energy is directly related to the development of the country and people's lives. With the continuous improvement of the level of industrialization, the types of electrical equipment in the power system are gradually increasing, and the connection of various inductive, nonlinear and unbalanced loads in the power grid will have a negative impact on power quality. In order to improve the power factor of the power system and eliminate the influence of reactive power and negative sequence on the power ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02J3/26
CPCH02J3/1821H02J3/26Y02E40/10Y02E40/50
Inventor 郑诗程徐权威刘海瑞郎佳红方四安徐磊
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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