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Output current-limiting control method for inversion type distributed power supply

An inverter distributed, power output technology, applied to electrical components, circuit devices, AC network circuits, etc., can solve problems such as increased voltage asymmetry

Inactive Publication Date: 2016-04-06
STATE GRID GASU ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The purpose of the present invention is to provide an output current limiting control method of an inverter distributed power supply, which solves the problem of increased voltage asymmetry existing in the prior art when an inverter distributed power supply is outputting a current limit

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  • Output current-limiting control method for inversion type distributed power supply
  • Output current-limiting control method for inversion type distributed power supply
  • Output current-limiting control method for inversion type distributed power supply

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Embodiment Construction

[0050] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0051] The output current limiting control method of the inverter type distributed power supply of the present invention achieves the purpose of current limiting while ensuring the output of active power as much as possible and reducing the voltage asymmetry, which is specifically implemented according to the following steps:

[0052] Step 1. Analyze the output current of the inverter-type distributed power supply, and implement the following steps:

[0053] Step (1.1). When the three-phase currents are symmetrical, convert the three-phase currents into currents in the rotating coordinate system:

[0054]

[0055] Generally, low-voltage distributed power sources are connected to the power grid using a three-phase three-wire system, so there is no zero sequence current component;

[0056] Step (1.2). When the three-phase currents are asymmetrical, convert the positive...

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Abstract

The invention discloses an output current-limiting control method for an inversion type distributed power supply. The maximum of output active power of the inversion type distributed power supply under symmetrical faults and under unsymmetrical faults can be ensured; meanwhile, the positive sequence voltage amplitude value output by the inversion type distributed power supply is improved, the negative sequence voltage amplitude value is reduced, and the degree of asymmetry of output voltage of the inversion type distributed power supply is reduced; specific to different current-limiting methods, a relatively high voltage output level of the inversion type distributed power supply is ensured under unsymmetrical faults, so that a low voltage protection action is not triggered easily; specific to the negative sequence overcurrent protection, the negative sequence current output is limited by the current-limiting method provided by the invention, so that the negative sequence overcurrent protection is relatively not triggered easily; and compared with a non-current-limiting control method and other two current-limiting control methods, the output current-limiting control method provided by the invention can both better ensure the stable operation of the inversion type distributed power supply without logging out under symmetrical faults and under unsymmetrical faults, so that the system stability is improved.

Description

Technical field [0001] The invention belongs to the technical field of controller parameter optimization design, and specifically relates to an output current limiting control method of an inverter type distributed power supply. Background technique [0002] In order to ensure the normal operation of the power electronic devices of the inverter-type distributed power supply, the output current of the inverter-type distributed power supply must be limited within a certain range, usually twice the rated current of the power electronic device. When the fault voltage drops deeply, the output current of the inverter-type distributed power supply can easily reach the current limit value. Therefore, the current-limiting operation mode is one of the common operation modes under the fault condition of inverter-type distributed power sources. The study of current-limiting measures of inverter-type distributed power sources and the fault characteristics under specific current-limiting metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/381
Inventor 马喜平贾嵘杨俊赵炜张光儒甄文喜秦睿胡殿刚李韶喻郑伟范迪龙雷俊杨勇葛治平袁芳杨柯董开松赵耀李臻沈渭程郑翔宇闵占奎刘秀良李志敏陈明忠魏博同焕珍姜梅王斌
Owner STATE GRID GASU ELECTRIC POWER RES INST
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