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Fault ride-through control method for inversion type new energy power supply

A technology of power failure, control method, applied in the direction of single-net parallel feeding arrangement, etc.

Active Publication Date: 2013-04-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a control method for fault ride-through of an inverter-type new energy power supply, which is used to overcome the defects of the existing unbalanced control strategy, thereby improving the fault ride-through capability of the inverter-type new energy power supply

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  • Fault ride-through control method for inversion type new energy power supply
  • Fault ride-through control method for inversion type new energy power supply
  • Fault ride-through control method for inversion type new energy power supply

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Embodiment Construction

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with 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.

[0031] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings, as figure 1 Shown is a schematic flowchart of a control method for fault ride-through of an inverter-type new energy power supply provided by an embodiment of the present invention, and the method includes:

[0032] Step 11: Add positive and negative sequence current limiters in the positive and negative sequence doub...

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Abstract

An embodiment of the invention discloses fault ride-through control method for an inversion type new energy power supply. The method includes: adding a positive and negative sequence current limiter into a vector orientation based positive and negative sequence d-q current control loop of the inversion type new energy power supply; monitoring network voltage positive sequence component and direct-current bus voltage of the inversion type new energy power supply; using the network voltage positive sequence component to start or stop control signals of a direct-current unloading circuit of the inversion type new energy power supply, and balancing unbalanced power on a direct-current side of an inverter by the aid of a direct-current voltage PI (proportional integral) controller. The control method is used for overcoming defects of existing unbalanced control strategies to improve fault ride-through capability of the inversion type new energy power supply.

Description

technical field [0001] The invention relates to the technical field of new energy power supply control, in particular to a control method for fault ride-through of an inverter-type new energy power supply. Background technique [0002] For new energy power sources (also known as inverter-type new energy power sources) that are directly connected to the grid only through inverters, such as permanent magnet direct-drive wind turbines or photovoltaic battery systems, which are widely used at present, can they be used under grid failures? The key to continuous non-grid and stable operation is whether the control strategy of the grid-connected inverter can ensure that the current flowing through the inverter and the DC bus voltage do not exceed the limit. Especially when an asymmetrical fault occurs in the power grid, the AC side current and DC side voltage of the grid-connected inverter will increase significantly. Forced to be removed from the power grid, it cannot meet the fa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
Inventor 毕天姝刘素梅杨奇逊
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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