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Control method and system for solving grid-connected impulse currents

A technology of inrush current and control method, which is applied in the grid-connected field, can solve problems such as current inrush, achieve the effects of reducing inrush current, minimizing inrush current, and ensuring the synchronization of amplitude and frequency

Active Publication Date: 2014-10-15
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention provides a control method and system for solving the grid-connected impact current, so as to solve the current impact problem in the grid-connected process in the prior art, and the specific scheme is as follows:

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  • Control method and system for solving grid-connected impulse currents
  • Control method and system for solving grid-connected impulse currents

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Embodiment Construction

[0053] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0054] The invention discloses a control method of grid-connected surge current, the flow chart of which is as follows figure 1 shown, including:

[0055] Step S11, sampling and phase-locking the three-phase voltage of the grid in real time;

[0056] Step S12, controlling the soft start of the bus voltage to reach a predetermined voltage value, and the predetermined voltage value is greater than the three-phase uncontrolled rectification value o...

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Abstract

The invention discloses a control method and system for solving grid-connected impulse currents. The control method includes that phase synchronization is guaranteed by compensating delay of a grid synchronization phase lock angle due to sampling and filtering; inverter vector control is performed through the real-time decomposition value namely the target control reference value of two voltage active and reactive components as well as the compensated grid synchronization phases lock angle to acquire the inverter voltage control vector, loop opening and delay starting are realized, and the amplitude and frequency are assuredly synchronized; in addition, judgment is made through the difference value of inverter line voltage and grid line voltage, and when the difference value is stabilized in a small range, a grid-connected relay is controlled to close, and instant impact current in closing of grids can be assuredly minimized even when three phrases are asymmetrical. With the control method, the phases, the amplitude and the frequency of the inverter voltage and the grid voltage can be strictly synchronized, the grid-connected impact current can be minimized, the impact current of the grid-connected inverter can be controlled during connecting and starting of the grids, and occurrence of the impact current is greatly reduced.

Description

technical field [0001] The invention relates to the field of grid connection, in particular to a control method and system for solving grid connection impact current. Background technique [0002] During the grid-connection process of the grid-connected inverter, because the phases of the grid-connected inverter and the grid are not completely synchronized, at the moment of grid-connection, since the grid can be regarded as an infinite grid, the current in the grid supplies power to the inverter , an inrush current will be generated instantaneously. [0003] Therefore, when the grid-connected inverter is started and connected to the grid, it is necessary to solve the problem of current impact during the grid-connected process. Contents of the invention [0004] In view of this, the present invention provides a control method and system for solving the grid-connected impact current, so as to solve the current impact problem in the grid-connected process in the prior art, a...

Claims

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Application Information

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IPC IPC(8): H02J3/40
Inventor 张国菊张彦虎曾志槐张凤岗
Owner SUNGROW POWER SUPPLY CO LTD
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