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Control method for distributed power supply decoupling linkage of distribution network faults

A technology of distributed power supply and control method, which is applied to AC network circuits, electrical components, circuit devices, etc., can solve the problems of common mode tripping, enhance system reserve capacity, and cannot reasonably utilize DG power generation capacity, and improve power supply reliability. Effect

Inactive Publication Date: 2019-09-06
STATE GRID SHANDONG ELECTRIC POWER +1
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Problems solved by technology

However, with the increasing number and penetration of DGs, the existing anti-islanding operation protection mode has exposed some shortcomings, such as the need to increase the requirements for system reserve capacity and the inability to reasonably utilize the power generation capacity of DGs, which may easily lead to Common mode tripping, causing the power supply reliability of the distribution network to drop, etc.

Method used

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  • Control method for distributed power supply decoupling linkage of distribution network faults

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with accompanying drawing:

[0022] Such as figure 1 As shown, the control method for the disaggregation and linkage of distributed power generation in distribution network faults includes the following steps:

[0023] (1) The distribution network containing DG is connected to the grid, and the data of the distribution network is collected;

[0024] (2) Measure the voltage, current and frequency of each node of the distribution network containing DG, and compare with the split data;

[0025] (3) When the voltage, current and frequency in step (2) meet the unloading conditions, the energy storage device operates normally;

[0026] (4) The energy storage equipment is changed from PQ control mode to V / F control mode;

[0027] (5) Suppose the rated output power of the energy storage equipment is PBESSo, the rated power of the micro-turbine is PMTo, the total load power is Pload, Ppcc is the switching po...

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Abstract

The invention discloses a control method for distributed power supply decoupling linkage of distribution network faults, and belongs to the field of power system fault processing. The method mainly comprises the following steps of 1, performing grid-connected operation on the distribution network; 2, measuring the voltage, current and frequency of the distribution network; 3, determining whether adecoupling condition is met; 4, carrying out V / F control by a micro-combustion engine or energy storage equipment; and 5, carrying out decoupling and then isolated island operation. The control method provided by the invention performs isolated islanding operation after the active decoupling of the distributed power supply to greatly improve the reliability and safety of the system power supply,and is mainly used in a distribution network containing DG.

Description

technical field [0001] The invention belongs to the field of power system fault handling, and in particular relates to a control method for de-serialization and linkage of distributed power sources with distribution network faults. Background technique [0002] As human beings pay more and more attention to environmental pollution and energy-saving issues, wind energy, solar energy and other renewable energy power generation technologies are gradually developing, and distributed generation (Distributed Generation, DG) technology has become a research hotspot at home and abroad. Distributed power supply has the advantages of flexible power supply, convenient installation, and environmental protection. Usually, DG is close to the user end to enhance the reliability of power supply at the load end, and at the same time ensure its power quality. However, with the increasing number and penetration of DGs, the existing anti-islanding operation protection mode has exposed some shor...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/28
CPCH02J3/381H02J3/28H02J3/388
Inventor 亓富军苏超牛庆松彭静肖利武于贺贺满丽廖誉翔赵福强庞伟超孙筱轩
Owner STATE GRID SHANDONG ELECTRIC POWER