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A distributed power grid-connected control method and system

A technology of distributed power supply and control method, which is applied in the direction of single-grid parallel feeding arrangement, multi-phase network elimination/reduction of asymmetry, etc. state, the risk of exacerbating the three-phase unbalanced state of the distribution network, etc.

Active Publication Date: 2019-10-22
CHINA AGRI UNIV
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Problems solved by technology

[0004] In the new scenario where large-scale distributed energy is connected to the distribution network and power generation is gradually increasing, the traditional distributed power grid-connected control strategy does not consider the three-phase unbalanced state, and assumes that the distribution network is in a three-phase balanced state. The three-phase balanced current is used as the reference input current of the distributed power supply, but because the voltage is in an unbalanced state, the traditional distributed power grid-connected control strategy cannot reduce the three-phase unbalanced state in the distribution network, and it will further aggravate the distribution The risk of the three-phase unbalanced state of the power grid

Method used

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  • A distributed power grid-connected control method and system

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Embodiment Construction

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the Some, but not all, embodiments are invented. 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.

[0041] figure 1 A flow chart of a distributed power grid-connected control method provided by an embodiment of the present invention, such as figure 1As shown, the method includes: S1, according to the positive sequence voltage of each phase in the three phases of the distributed power supply, the negative sequence voltage of each phase, the active power of each phase ...

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Abstract

The embodiment of the present invention provides a distributed power supply grid-connected control method and system. According to the present invention, the imbalance state of the system is considered during a grid-connected process, by taking the imbalance amount of the active power as an objective function and utilizing a Lagrange multiplier method, the reference output current of each of the three phases of a distributed power supply is calculated, and the reference output current of each phase is utilized to adjust the actual output current of each phase, so that the grid-connected control of the distributed power supply is realized, and the voltage imbalance degree of a power distribution network is reduced.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of distributed power generation in distribution networks, and more specifically, to a distributed power grid-connected control method and system. Background technique [0002] Distributed power generation has extensive economic and social benefits. Today, when energy is increasingly scarce, the country vigorously advocates distributed power generation, especially the use of solar energy, and photovoltaic power generation has been vigorously developed. While distributed generation meets self-sufficiency, the excess power needs to be input into the distribution network for other users. Correspondingly, when distributed generation cannot meet its own supply, the distribution network is required to provide power support. Multiple distributed power sources can be connected to the distribution network independently or form a microgrid system to connect to the distribution network. Compared w...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/26
Inventor 杜松怀邓潘陈定宇盛万兴苏娟刘科研叶华
Owner CHINA AGRI UNIV
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