Grid voltage feed-forward control system and control method for chain type STATCOM

A grid voltage and feedforward control technology, applied in flexible AC transmission system, AC network voltage adjustment, AC network to reduce harmonics/ripples, etc., can solve problems such as off-grid, to ensure harmonic characteristics and prevent off-grid Net, improve the effect of stability

Active Publication Date: 2017-05-31
NR ELECTRIC CO LTD +3
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Problems solved by technology

[0005] The purpose of the present invention is to provide a grid voltage feed-forward control system and control method for chained STATCOMs, which can solve the problem that the conventional control strategy adopted by the existing chained STATCOMs easily causes the overcurrent protection action of the equipment when the grid fails. The problem of off-grid, and can ensure that the output current of STATCOM has good harmonic characteristics during steady-state operation, and improve the stability of the equipment

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  • Grid voltage feed-forward control system and control method for chain type STATCOM
  • Grid voltage feed-forward control system and control method for chain type STATCOM
  • Grid voltage feed-forward control system and control method for chain type STATCOM

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Embodiment Construction

[0042] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0043] Such as figure 1 As shown, the present invention provides a grid voltage feed-forward control system for a chained STATCOM, wherein the topology of the chained STATCOM includes a star connection and a delta connection, respectively as figure 2 and image 3 As shown, the control system adopts hierarchical control, the main controller adopts a DSP processor, and the valve controller adopts a DSP processor+FPGA processor structure; the control system includes the following functional modules:

[0044] The DC voltage sampling calculation module P1 is used to sample the DC voltage steady-state value of each module and calculate the average value U dc ;

[0045] The main controller grid voltage sampling module P2 is used for the main controller to sample the steady-state instantaneous value u of the grid voltage at a fixed time in each...

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Abstract

The invention discloses a grid voltage feed-forward control system and control method for a chain type STATCOM. The instantaneous value of grid voltage is used as a feedforward control amount, an instantaneous voltage signal is employed by the feedforward signal in a steady state and is changed into a dp component through abc/dq, the one-order low-pass filtering of the feedforward signal is carried out in a dq coordinate system, and then an instantaneous feed-forward signal with a filtering link is obtained after da/abc inverse transformation. Through judging a grid voltage instantaneous value change amplitude and change rate, whether a current grid is failed or not is determined, and a control switching command is emitted to select different feedforward signals. The feedforward signals are accumulated to the output of a current ring to generate a modulation wave to be outputted to a modulation module to generate pulses. A problem that an equipment over-current protection action and offline are easily caused in a grid failure due to the use of a conventional control strategy by an existing chain type STATCOM can be solved, the good harmonic characteristic of the output current of the STATCOM in a steady state operation can be ensured, and the stability of equipment is improved.

Description

technical field [0001] The invention belongs to the field of power electronics, and in particular relates to a grid voltage feedforward control system and control method for a chained STATCOM. Background technique [0002] STATCOM is mainly used in power transmission system, distribution network and new energy power generation in the power grid. When the AC power grid fails, STATCOM needs to output rated or even overloaded reactive current to support the grid voltage, speed up the voltage recovery after the grid fault, and enhance The ability to resist major power grid accidents and improve the voltage stability of the system. [0003] For traditional STATCOM devices, regardless of angle connection or star connection, the control system often uses dq vector control, and the feedforward value uses the dq axis components calculated based on the grid voltage steady-state value and the vector angle locked by the phase-locked loop. When the grid voltage fails at the moment, due ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/16H02J3/01
CPCH02J3/01H02J3/16Y02E40/10Y02E40/30Y02E40/40
Inventor 王翀吴小丹李晓明吴扣林朱信舜邱金辉杨飞贾松江钱海李丽群刘君
Owner NR ELECTRIC CO LTD
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