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High-permeability photovoltaic power distribution network partition voltage regulation method

A high-penetration, distribution network technology, applied in photovoltaic power generation, AC network voltage adjustment, single-network parallel feeding arrangement, etc., can solve problems such as inability to provide support for accurate voltage control

Pending Publication Date: 2020-07-07
LIUAN POWER SUPPLY COMPANY STATE GRID ANHUI ELECTRIC POWER
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Problems solved by technology

The commonly used methods deal with the randomness of photovoltaics on a large time scale, which cannot provide support for short-term and ultra-short-term precise voltage control

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  • High-permeability photovoltaic power distribution network partition voltage regulation method

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with accompanying drawing:

[0047] In this embodiment, the high-permeability photovoltaic distribution network partition voltage regulation method includes the following steps:

[0048] Step 1: Decompose the load data in the frequency domain to obtain the daily cycle, weekly cycle, low-frequency component and high-frequency component, calculate each component separately and perform sequence reconstruction;

[0049] The power load itself is both regular and random. The short-term forecast load is the basis for determining the power generation plan and reserve capacity, and it also has an important impact on voltage regulation. In the process of improving predictive modeling methods, relative modeling errors usually cannot be completely eliminated, and the existing non-zero lower limit is determined by the irregularity inside the load. Decompose the periodic power load in the frequency domain, extract ...

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Abstract

The invention relates to a high-permeability photovoltaic power distribution network partition voltage regulation method. The method comprises: carrying out frequency domain decomposition on load datato obtain a daily period, a week period, a low-frequency component and a high-frequency component, respectively calculating each component and then carrying out sequence reconstruction; carrying outabnormal point detection on the photovoltaic data, carrying out similar day clustering selection based on irradiance characteristics, and predicting photovoltaic short-term output power through an LSTM neural network model; dividing the distributed power distribution network into a plurality of sub-communities, and selecting key nodes as installation points of controllable photovoltaics; and selecting controllable PV nodes to be used as key nodes, and adjusting the node voltage after grid connection by adjusting the reactive compensation and active attenuation power values of the controllablePV nodes. According to the method, the prediction precision is improved, refined voltage regulation can be carried out on the distribution network nodes, the problem of voltage out-of-limit after photovoltaic access is solved, and the photovoltaic absorption capacity of a power grid is improved.

Description

technical field [0001] The invention relates to the technical field of division of photovoltaic distribution networks, in particular to a method for voltage regulation in divisions of photovoltaic distribution networks with high permeability. Background technique [0002] With the advancement of the country's energy conservation and emission reduction policies and energy reforms, clean energy has gradually changed from the initial supplementary energy to alternative energy. Among them, photovoltaic power generation is forming a large-scale and high-penetration grid-connected trend in some areas. After large-scale photovoltaic grid connection, the distribution network is transformed from a traditional single-source radiation network to a multi-source interconnected network system, which changes the system damping characteristics, power flow distribution, steady-state voltage and voltage stability of the distribution network. In recent years, researchers have conducted in-dep...

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Application Information

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IPC IPC(8): H02J3/38H02J3/48H02J3/50H02J3/12
CPCH02J3/48H02J3/50H02J3/12Y02E10/56
Inventor 马骏丁倩刘红新徐璐陈青徐斌李葆汪君汤远红邵郁段丽
Owner LIUAN POWER SUPPLY COMPANY STATE GRID ANHUI ELECTRIC POWER
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