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A low-voltage ride-through control method and system for a photovoltaic-containing DC power distribution system

A low-voltage ride-through and control method technology, applied in photovoltaic power generation, AC network load balancing, greenhouse gas reduction and other directions, can solve serious problems such as power system, generator burden, power failure and so on

Inactive Publication Date: 2021-11-30
HUAZHONG UNIV OF SCI & TECH +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0002] With the development of the DC distribution network, photovoltaic systems are widely used due to their distribution range. At the same time, there are some disadvantages. When the power grid fails, if the power generation system is suddenly disconnected from the power grid, the traditional power generation caused a heavy load on the machine, which led to severe power system problems and eventually blackouts

Method used

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  • A low-voltage ride-through control method and system for a photovoltaic-containing DC power distribution system
  • A low-voltage ride-through control method and system for a photovoltaic-containing DC power distribution system
  • A low-voltage ride-through control method and system for a photovoltaic-containing DC power distribution system

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[0071] The principles and features of the present invention will be described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0072] Such as figure 1 As shown, the embodiment of the present invention provides a low voltage ride through control method for a photovoltaic DC power distribution system, including:

[0073] Step 1. Obtain the voltage waveform and current waveform of the preset time window at the photovoltaic outlet, and perform Fourier transform processing on the voltage waveform and current waveform;

[0074] Step 2, calculating the data processed by Fourier transform to obtain the characteristic energy value;

[0075] Step 3. Judging whether the power distribution system is faulty according to the characteristic energy value;

[0076] Step 4. If there is a fault, send a signal to the grid-connected AC station, energy sto...

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Abstract

The invention discloses a low-voltage ride-through control method and system of a photovoltaic-containing DC power distribution system, and relates to the field of relay protection of electric power systems. The method includes: Step 1, obtaining the voltage waveform and current waveform of a preset time window at the photovoltaic outlet, and performing Fourier transform processing on the voltage waveform and the current waveform; Step 2, performing Fourier transform processing on the The final data is calculated to obtain the characteristic energy value; step 3, judge whether the power distribution system is faulty according to the characteristic energy value; step 4, if there is the fault, change the control mode of the grid-connected AC station from constant DC voltage to The control is switched to the island mode, and the control mode of the photovoltaic converter station is switched from constant power control to maximum power tracking mode, so that the low voltage ride-through of the power distribution system is achieved. The invention is suitable for relay protection, can solve the problem of insufficient low-voltage ride-through ability, and achieve the effect of improving the system's non-off-grid operation ability.

Description

technical field [0001] The invention relates to the field of relay protection of power systems, in particular to a method and system for controlling low-voltage ride-through of a photovoltaic DC power distribution system. Background technique [0002] With the development of the DC distribution network, photovoltaic systems are widely used due to their distribution range. At the same time, there are some disadvantages. When the power grid fails, if the power generation system is suddenly disconnected from the power grid, the traditional power generation Machines are heavily burdened, which leads to severe power system problems and eventually blackouts. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a low-voltage ride-through control method and system for a photovoltaic-containing DC power distribution system in view of the deficiencies in the prior art. [0004] The technical solution of the present invention t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/32
CPCH02J3/32H02J3/38Y02E10/56Y02E70/30
Inventor 林湘宁汪光远马啸李正天曹善康
Owner HUAZHONG UNIV OF SCI & TECH
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