Self-adaptation dead-time compensation method for H-bridge cascade STATCOM (static synchronous compensator)

A technology of self-adaptive compensation and dead-time compensation, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, flexible AC transmission systems, etc., can solve the problem of lack of H-bridge cascaded STATCOM dead-time compensation, etc.

Inactive Publication Date: 2014-09-10
哈尔滨同为电气股份有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention is to solve the problem of lack of dead zone compensation directly for the H-br

Method used

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  • Self-adaptation dead-time compensation method for H-bridge cascade STATCOM (static synchronous compensator)
  • Self-adaptation dead-time compensation method for H-bridge cascade STATCOM (static synchronous compensator)
  • Self-adaptation dead-time compensation method for H-bridge cascade STATCOM (static synchronous compensator)

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specific Embodiment approach 1

[0019] Specific implementation mode one: the following combination figure 1 with figure 2 Describe this embodiment, the H-bridge cascaded STATCOM self-adaptive dead zone compensation method described in this embodiment, this method comprises the following steps:

[0020] Step 1. According to the circuit topology of the H-bridge cascaded STATCOM, the discrete mathematical model of the H-bridge cascaded STATCOM under the three-phase coordinate system is obtained;

[0021] Step 2, obtain the transfer function form under the discrete state according to the discrete mathematical model of the H-bridge cascaded STATCOM obtained in step 1;

[0022] Step 3: Using a discrete disturbance observer to conduct real-time online observation of the difference between the STATCOM output voltage and the reference voltage caused by the dead zone effect, and use the observed difference as a compensation amount to introduce it into the H-bridge cascaded STATCOM control system In, the adaptive c...

specific Embodiment approach 2

[0023] Specific embodiment two: this embodiment further limits the H-bridge cascaded STATCOM adaptive dead zone compensation method described in specific embodiment one. In this embodiment, the discrete mathematical model under the three-phase coordinate system in step one is :

[0024] L di a dt = u sa - u a - Ri a L di b dt = u ...

specific Embodiment approach 3

[0032] Specific embodiment three: this embodiment further limits the H-bridge cascaded STATCOM adaptive dead zone compensation method described in specific embodiment one. In this embodiment, in step two, the transfer function obtained under the discrete state is:

[0033] G ( z ) = Z [ H 0 ( s ) · G ( s ) ] = Z [ H 0 ...

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Abstract

The invention discloses a self-adaptation dead-time compensation method for H-bridge cascade STATCOM (static synchronous compensator) and aims to solve the problem of lack of dead-time compensation directly targeting the H-bridge cascade STATCOM. According to a circuit topological structure of the H-bridge cascade STATCOM, the method includes steps of acquiring a discrete mathematic model of the H-bridge cascade STATCOM in a three-phase coordinate system; converting the discrete mathematic model into a transfer function mode in the discrete state; online monitoring difference between STATCOM output voltage and reference voltage caused by the dead-time effect by a discrete disturbance monitor in real time, utilizing the monitored difference as compensation capacity to introduce into a H-bridge cascade STATCOM control system, and self-adaptation dead-time compensation is realized.

Description

technical field [0001] The invention relates to an H-bridge cascaded STATCOM self-adaptive dead zone compensation method. Background technique [0002] In industrial applications, with the widespread use of non-linear loads in the power grid, the generated reactive power and harmonic currents have a serious impact on the power grid. In order to ensure better power quality, it is necessary to perform reactive power compensation and Harmonic elimination to improve the reliability and stability of the power grid. H-bridge cascaded static synchronous compensator (STATCOM) uses multi-level conversion technology to reduce the voltage stress of switching devices. Through cascading, the entire device can output high voltage, and has low loss, fast response, and small energy storage components. And the advantages of low harmonic content of output current have become an important direction for the development of dynamic reactive power compensation devices, and have been rapidly devel...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCY02E40/16Y02E40/10Y02E40/40
Inventor 于泳徐榕徐殿国何崇飞
Owner 哈尔滨同为电气股份有限公司
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