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DSTATCOM negative-sequence current cross coupling compensation control method

A cross-coupling and negative-sequence current technology, applied in reactive power adjustment/elimination/compensation, electrical components, circuit devices, etc., to achieve simple and reliable implementation, overcome complexity, avoid complexity and inaccurate results

Active Publication Date: 2015-03-25
ANHUI ONESKY POWER QUALITY TECH CO LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

These control methods control the positive and negative sequence target currents separately, requiring a lot of coordinate transformation calculations

Method used

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  • DSTATCOM negative-sequence current cross coupling compensation control method
  • DSTATCOM negative-sequence current cross coupling compensation control method
  • DSTATCOM negative-sequence current cross coupling compensation control method

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Embodiment Construction

[0029] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0030] see Figure 2-3 , is a schematic structural diagram of the three-phase full-bridge star-connected DSTATCOM topology system of the present invention and a schematic structural diagram of the corresponding mathematical model. The star DSTATCOM is connected to the three-phase three-wire distribution network. The star DSTATCOM is a three-phase star connection structure, and its topology is composed of a low-voltage three-phase full bridge or a medium-high voltage chain H-bridge. The load current i 1a ,i 1b ,i 1c Including active power, reactive power, negative sequence and harmonic current, among which reacti...

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Abstract

The invention discloses a DSTATCOM negative-sequence current cross coupling compensation control method. Conventional dq conversion software phase-locking closed-loop control complexity is avoided by the adoption of a digital phase-locking method with a sine and cosine trigonometric function as a two-dimensional orthogonal basis. In addition, the complexity of current negative-sequence current compensation control coordinate conversion control is overcome, a cross coupling negative-sequence current control strategy is provided, cross coupling is carried out on the negative-sequence current closed-loop controller output value in the counterclockwise rotation dq coordinate system to the positive-sequence reactive current or positive-sequence harmonic current current-voltage conversion result, and unified space vector control is carried out.

Description

technical field [0001] The invention relates, in particular, to a DSTATCOM negative-sequence current cross-coupling compensation control method. Background technique [0002] In recent years, due to the rapid development of power electronic technology, various power electronic converters have been widely used in power systems, industries, transportation and households. There are a large number of unbalanced, nonlinear loads, impacts, fluctuations Sexual loads and some single-phase large-capacity loads, such as spot welding machines powered by single-phase line voltage used in automobile manufacturing and other industries, industrial AC electric arc furnaces, electrified railways, etc. The negative sequence, reactive power and harmonic currents generated by these loads have caused a large amount of power loss, which is becoming more and more serious, threatening the safety and economic operation of the power system. In the management of power quality at the user end, reactiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCH02J3/00H02J3/01H02J3/18Y02E40/10Y02E40/40
Inventor 李瑜齐东流
Owner ANHUI ONESKY POWER QUALITY TECH CO LTD
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