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Zero-sequence-voltage-based current conversion chain average DC voltage control method

A technology of zero-sequence voltage and DC voltage, applied in the direction of power transmission AC network, etc., can solve the problems of unclear control effect and unclear control principle, and achieve the effect of excellent control performance, wide application range and simple and clear control principle

Active Publication Date: 2011-09-14
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Three-phase balance control using reactive current feedback, the control principle is not clear, and the control effect is not obvious

Method used

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  • Zero-sequence-voltage-based current conversion chain average DC voltage control method
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  • Zero-sequence-voltage-based current conversion chain average DC voltage control method

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Embodiment Construction

[0020] The control method of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0021] The system voltage, link DC voltage, and converter output current in the content are all obtained by the measurement link. When the electrical quantity signal is used to achieve the control target, it has been filtered and reduced.

[0022] In order to more clearly explain the working principle of the present invention’s method for controlling the average DC voltage of the commutation chain based on zero-sequence voltage, the cascaded H-bridge STATCOM converter system is taken as an example for analysis and description. The STATCOM structure is shown in the attached figure 1 shown. Each phase is composed of N cascaded single-phase inverters with independent DC capacitors in series. The three-phase commutation chain adopts a star connection method, and the neutral point is not grounded.

[0023] attached figure 2 It is an overa...

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PUM

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Abstract

The invention relates to a zero-sequence-voltage-based current conversion chain average DC voltage control method, which comprises the following steps of: performing subtraction on the average DC voltage of current conversion chains of any two phases in all current conversion chains and an average DC voltage value of all chain links to obtain the average DC voltage deviation of the current conversion chains of the two phases, and performing an operation on the deviation by using a proportional integral controller to obtain the active power deviation of the current conversion chains of the corresponding phases; and performing zero sequence voltage instruction computing by combining the active power deviation and an effective value and phase of positive sequence current output by a current converter to obtain a zero sequence voltage instruction of the current converter, performing a multiplication operation to obtain the zero sequence voltage instruction of a three-phase current conversion chain, and using the zero sequence voltage instruction of the three-phase current conversion chain as a modulated wave voltage reference value of current conversion chain average DC voltage control to control the output of the three-phase current conversion chain to form closed loop control. In the method, zero sequence voltage is regulated according to the average DC voltage deviation of any two phases so as to ensure that three-phase power meets requirements and effectively solve the problem of current conversion chain average DC voltage unbalance; and the method has the advantages of principle simplicity and definiteness, high performance, wide application range, high practicability and the like.

Description

technical field [0001] The invention belongs to the technical field of power electronic device control, and in particular relates to a zero-sequence voltage-based control method for the average DC voltage of a commutation chain, which can be applied to the DC voltage control method of a chain-type converter. Background technique [0002] The chain-type converter is widely used in engineering, and it is composed of multiple single-phase commutation chains. Each single-phase static synchronous compensator includes a single-phase commutation chain, and each single-phase commutation chain consists of at least one single-phase module (i.e. figure 1 The cascade module 1...n) in the composition, each single-phase module includes at least one chain link, and the chain links can be connected in series or in parallel, and each chain link includes H Bridge type voltage source converter. [0003] The chain-link converter has many advantages, and can realize independent phase-separatio...

Claims

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Application Information

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IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 邓占锋周飞赵国量蔡林海荆平胡为进刘隽陆如仇琦玮沈冬
Owner CHINA ELECTRIC POWER RES INST
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