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Low voltage ride through control method for three-phase network connection photovoltaic inverter

A photovoltaic inverter, low voltage ride through technology, applied in photovoltaic power generation, single grid parallel feeding arrangement, etc., can solve the problem of inverter off-grid, low voltage, etc., to prevent off-grid, avoid response lag, solve Effects of Steady-State Control Problems

Active Publication Date: 2014-07-09
TIANJIN RES INST OF ELECTRIC SCI +2
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  • Abstract
  • Description
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art, and propose a low-voltage ride-through control method for three-phase grid-connected photovoltaic inverters to solve the problem of conventional control strategies adopted by existing three-phase grid-connected photovoltaic During the voltage drop process, it is easy to cause the inverter to be disconnected from the grid due to the overcurrent protection action, so as to realize the low-voltage safe ride-through of the grid-connected photovoltaic inverter

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[0022] Below in conjunction with the accompanying drawings, the present invention is illustrated in detail the implementation method, but for some known methods (such as average value sampling and its lag compensation, phase-locked loop PLL, pulse width modulation PWM control, vector conversion, maximum power point tracking MPPT, closed-loop PI adjustment , clipping, etc.) are not specified in detail.

[0023] One example of a low voltage ride through control method for a three-phase grid-connected photovoltaic inverter is in figure 1 The three-phase grid-connected photovoltaic inverter electrical control system shown is implemented. The control system is composed of the main circuit of the three-phase grid-connected photovoltaic inverter and the photovoltaic inverter controller that adopts the grid voltage direct feedforward control mode. .

[0024] figure 1 The main circuit of the three-phase grid-connected photovoltaic inverter in the example includes a three-phase tran...

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Abstract

The invention relates to a low voltage ride through control method for a three-phase network connection photovoltaic inverter. The method is characterized in that the output voltage of the inverter is controlled by a network voltage direct feed-forward control policy, whether a network voltage dip fault happens or not is judged by detecting an instantaneous value of the network voltage, a mean network voltage value is directly fed forward when the network voltage is in the range of normal values, and the network voltage direct feed-forward control policy is adopted when the network voltage dip is detected. The low voltage ride through control method for the three-phase network connection photovoltaic inverter has a rational design, the problem that a network connection photovoltaic inverter outputs overcurrent at the beginning of the network voltage dip is solved, and the safe low voltage ride through of the network connection photovoltaic inverter can be realized.

Description

technical field [0001] The invention relates to a low-voltage ride-through technology of a three-phase grid-connected photovoltaic inverter. Background technique [0002] The electric energy generated by the photovoltaic power generation system changes with the intensity of sunlight. Unless it is equipped with an energy storage system, it generally cannot provide continuous and stable electric energy. With the rapid development of the photovoltaic power generation industry in recent years, especially the massive use of large-scale photovoltaic grid-connected power stations, it poses certain problems to the stability of the grid operation, especially in the case of low voltage drops in the grid, if many of these The sudden collective power off-grid will aggravate the grid oscillation and even lead to major accidents of the grid collapse. Therefore, many countries have proposed mandatory standards for the LVRT (Low Voltage Ride Through) capability of high-power photovoltaic g...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
CPCY02E10/563Y02E10/56
Inventor 郭培健伍丰林楚子林许希金雪峰张超田凯苏楠
Owner TIANJIN RES INST OF ELECTRIC SCI
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