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High-permeability photovoltaic access power distribution network multi-terminal cooperative voltage treatment method and system and storage medium

A technology with high penetration rate and voltage management, applied in photovoltaic power generation, AC network voltage adjustment, energy storage, etc., can solve the problems of distribution network voltage exceeding the limit, difficulty in full network, decentralized key voltage pollution sources, etc. To achieve the effect of solving time period, reducing the investment cost of management equipment, improving voltage regulation ability and accommodating distributed resources

Active Publication Date: 2022-03-11
NANJING UNIV OF POSTS & TELECOMM +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: in view of the ubiquitous periodical and intermittent voltage over-limit problems in the distribution network with high-permeability photovoltaic access, it is difficult for traditional voltage regulation equipment to realize the key to the whole network and decentralization. Collaborative governance of voltage pollution sources, how to use the intelligent matching and collaborative adjustment of source network, load and storage multi-terminal voltage control equipment to solve the voltage limit problem of distribution network

Method used

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  • High-permeability photovoltaic access power distribution network multi-terminal cooperative voltage treatment method and system and storage medium
  • High-permeability photovoltaic access power distribution network multi-terminal cooperative voltage treatment method and system and storage medium
  • High-permeability photovoltaic access power distribution network multi-terminal cooperative voltage treatment method and system and storage medium

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Embodiment 1

[0022] Aiming at periodical and systematic over / undervoltage problems, this embodiment provides a multi-terminal coordinated voltage management method for high-permeability photovoltaic access to the power grid, including grid-side transformer gear switching and distributed power multi-functional grid-connected inverters. Reactive power / active power Q / P adjustment, distributed energy storage inverter Q / P adjustment, adopting reactive power compensator SVC at the load end.

[0023] An embodiment of the present invention provides a multi-terminal coordinated voltage management method for a distribution network with high-permeability photovoltaic access, which specifically includes the following steps:

[0024] Step 1. Each distributed cooperative intelligent body device collects the voltage information of the local bus node respectively, and calculates the corresponding voltage per unit value according to their respective nominal voltages, as shown in formula (1), and sends the v...

Embodiment 2

[0065] If the bus voltage has intermittent local over / under voltage problems, Embodiment 2 of the present invention provides a multi-terminal coordinated voltage control method for a power grid connected to photovoltaics with high penetration rate, which specifically includes the following steps:

[0066] The distributed cooperative intelligent body device determines whether to execute the distributed cooperative voltage regulation algorithm according to the evaluation of the local bus voltage. When the voltage deviation is greater than the set threshold, the power information from the adjacent bus nodes is used to determine the multi-terminal power cooperative regulation method. The power information of the adjacent bus nodes is sent to the distributed collaborative intelligent device of the corresponding bus nodes, and the power of each compensation equipment is adjusted to maintain the system voltage of the local distribution network within the safe zone.

[0067] Step 1. On...

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Abstract

The invention discloses a high-permeability photovoltaic access power distribution network multi-terminal cooperative voltage treatment method and system and a storage medium. In the method, when time-phased and systematic overvoltage / undervoltage occurs, a centralized intelligent coordinated voltage regulation method is adopted; comprising the steps of network end transformer gear switching, distributed power supply multifunctional grid-connected inverter Q / P adjustment, distributed energy storage inverter Q / P adjustment and adoption of a load end reactive power compensator SVC. When intermittent local overvoltage / undervoltage occurs, a terminal multi-agent distributed cooperative voltage regulation method is adopted, and distributed cooperative voltage regulation algorithms of a distributed power supply multifunctional grid-connected inverter, a distributed energy storage inverter and a load end SVC of local and adjacent nodes are utilized to perform distributed cooperative compensation on local node voltage. According to the power distribution network multi-terminal cooperative voltage treatment method and system, systematic treatment of the whole-network and decentralized voltage problem is realized.

Description

technical field [0001] The invention belongs to the technical field of distribution network voltage management, and in particular relates to a multi-terminal coordinated voltage management method and system of a distribution network with high-permeability photovoltaic access. Background technique [0002] Driven by the "double carbon" goal, it will bring about the demand for photovoltaic construction in the whole county. Under the requirement of "connection and connection" of the power system for the connection of photovoltaics in the whole county, it will inevitably cause the entire feeder line of the light-load distribution network in rural and mountainous areas. Correspondingly, there will be a periodical undervoltage problem in heavy-duty distribution networks in cities such as heavy industrial production. At present, the distribution network mainly adopts decentralized voltage control methods, that is, deploy voltage control equipment wherever the key pollution sources ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/16H02J3/18H02J3/38H02J3/28
CPCH02J3/16H02J3/18H02J3/381H02J3/28H02J2300/24Y02E10/56Y02E40/30Y02E70/30
Inventor 岳东窦春霞丁孝华李群郭王勇罗剑波张智俊张占强赵景涛杨毅李延满杜红卫赵昕汪鹤
Owner NANJING UNIV OF POSTS & TELECOMM
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