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Fault ride-through method and device of photovoltaic collection system and computer storage medium

A fault ride-through, photovoltaic technology, applied in photovoltaic power generation, single-grid parallel feeding arrangement, etc., can solve the problem of long power interruption time, and achieve the effect of ensuring stable operation, avoiding blocking and downtime, and improving availability.

Pending Publication Date: 2020-11-17
XIAN XJ POWER ELECTRONICS TECH +4
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a fault ride-through method, device and computer storage medium fo

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  • Fault ride-through method and device of photovoltaic collection system and computer storage medium
  • Fault ride-through method and device of photovoltaic collection system and computer storage medium

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Example Embodiment

[0028] The present invention will be further described in detail below with reference to the drawings, and the photovoltaic collection systems in the following specific embodiments are all photovoltaic DC boost collection systems.

[0029] Method embodiment:

[0030] The invention provides a fault ride-through method of a photovoltaic DC boost collection system, such as figure 1 Shown is a schematic diagram of a DC unipolar ground fault of a photovoltaic DC boost collection system. The photovoltaic power generation is collected on the DC bus through a maximum power tracking controller (Maximum Power Point Tracking, MPPT) and a DC boost converter (DC / DC). A single-pole ground fault is a ground fault of any pole on the DC bus.

[0031] Such as figure 2 As shown, the steps of the fault ride-through method are as follows:

[0032] 1) After detecting a DC unipolar ground fault, the DC boost converter is blocked.

[0033] After a single-pole ground fault is detected, the DC boost converter ...

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Abstract

The invention relates to a fault ride-through method and device for a photovoltaic collection system, and a computer storage medium, and the method comprises the steps: locking a DC boost converter when a DC monopole grounding fault is detected, and controlling MPPT zero-power operation; when it is detected that the direct-current monopole grounding fault is removed, unlocking the direct-current boost converter, MPPT working in an output end direct-current voltage control mode, and the direct-current boost converter being charged; and after the direct-current boost converter is charged to a rated value, MPPT recovering power transmission. After a single-pole grounding fault occurs, in order to avoid shutdown of the whole system, the direct-current boost converter is directly locked, MPPT zero-power operation is carried out, positive and negative power efficiency is balanced, stable operation of the system is ensured, and fault ride-through is realized; locking shutdown of the whole system is avoided, the power interruption time is shortened, and the availability of the system is improved.

Description

technical field [0001] The invention relates to the technical field of new energy grid-connected power generation, in particular to a fault ride-through method, device and computer storage medium of a photovoltaic collection system. Background technique [0002] At present, the photovoltaic power station adopts AC collection and transmission, and a large number of inverters are coupled with long-distance cables. The voltage limit and wide-frequency oscillation problems restrict the transmission capacity of the photovoltaic power station, and the loss of AC lines affects the overall efficiency of the system. With the development and maturity of power electronics and DC transmission technology, it is possible for photovoltaic power plants to use DC boosting and collecting and sending. The DC collection system has higher stability, no need for reactive power compensation, and the transmission capacity is stronger and the loss is smaller under the same voltage level. Photovolta...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCY02E10/56
Inventor 行登江杨美娟李道洋张浩辛德锋
Owner XIAN XJ POWER ELECTRONICS TECH
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