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A high voltage ride through control method

A control method and high-voltage technology, applied in AC network voltage adjustment, reactive power compensation, single-grid parallel feeding arrangement, etc., can solve problems such as high-voltage ride-through control, and achieve the effect of improving the adaptability of power grids

Active Publication Date: 2017-07-07
XUJI GRP +4
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a high voltage ride through control method to solve the problem of high voltage ride through control

Method used

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Embodiment Construction

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

[0021] The main circuit of the photovoltaic grid-connected inverter is as follows: figure 1 As shown in the upper part, it includes DC bus support capacitor, three-phase half-bridge power circuit, LCL filter circuit, etc. The circuit configuration belongs to the prior art, and will not be described too much here.

[0022] The method of the present invention is a photovoltaic grid-connected inverter control method based on positive and negative sequence dual synchronous coordinate systems, and the control structure is as follows: figure 1 As shown in the lower part, the whole is a double closed-loop control of the DC voltage outer loop and the current inner loop. The outer loop voltage command is calculated by MPPT, and the current inner loop uses 4 sets of independent controllers. The output current of the bridge arm is decomposed by the double synchronous c...

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Abstract

The invention relates to a high voltage ride through control method. The method comprises the following steps: performing PI closed-loop control on id_P, id_N, iq_P and iq_N respectively through a d and q decoupling control strategy under a positive and negative-sequence dual-rotation coordinate system, and detecting a positive-sequence voltage axis-d component instantaneous value ud_P in real time; when ud_P enters an over-voltage interval, stopping a normal working mode, limiting active output, and providing reactive power according the amplitude of voltage rise; and after the network voltage returns to normal, recovering a positive-sequence current axis-d command to a pre-fault state according to a preset slope, and switching to the normal working mode before the occurrence of a fault to run. Negative-sequence current loop d and q commands are returned to zero, so that the output current negative-sequence component of an inverter is 0 under the working condition of power grid or load imbalance, and the output three-phase current is balanced.

Description

technical field [0001] The invention relates to a high-voltage ride-through control method, in particular to a high-voltage ride-through control method for a photovoltaic grid-connected inverter. Background technique [0002] In the power system, the AC grid will produce overvoltage phenomenon due to load disturbance or line fault factors. Overvoltage is one of the common grid transient faults in the power system. As photovoltaic power generation accounts for an increasing proportion of electric energy, the impact of photovoltaic grid-connected systems on the power grid cannot be ignored. For conventional small-capacity photovoltaic grid-connected power generation systems, when the grid voltage exceeds a certain range, in order to ensure the safety of the photovoltaic system, the photovoltaic array will automatically disconnect from the grid. This situation is possible in grids with a low proportion of photovoltaic power generation; However, for grids with large photovoltai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/16
CPCY02E40/30
Inventor 肖飞张海龙王林黄辉曹建博赵建荣陈雪牛化鹏
Owner XUJI GRP