A low-voltage ride-through detection device for photovoltaic power generation compatible with dual voltage levels

A low-voltage ride-through and voltage level technology, applied in photovoltaic power generation, photovoltaic system monitoring, photovoltaic modules and other directions, can solve the problems of detection system voltage level, capacity, lack of measurement methods, etc., achieve small size, easy installation, good protection effect of action

Active Publication Date: 2022-04-22
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] High-power photovoltaic grid-connected inverters must have the function of low-voltage ride-through, and low-voltage ride-through detection should be carried out according to the standard requirements. a series of challenges

Method used

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  • A low-voltage ride-through detection device for photovoltaic power generation compatible with dual voltage levels
  • A low-voltage ride-through detection device for photovoltaic power generation compatible with dual voltage levels
  • A low-voltage ride-through detection device for photovoltaic power generation compatible with dual voltage levels

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Experimental program
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Effect test

Embodiment 1

[0031] The voltage drop characteristics generated by the impedance divider voltage drop generator are closest to the voltage drop characteristics of the actual grid fault, and can accurately reflect the interaction and interaction between the grid and the photovoltaic inverter during the grid fault, so the impedance divider is used The way to design low voltage ride through detection device.

[0032] as attached figure 1 As shown, in the present invention, the controllable circuit breaker CB1, the current limiting reactor X1, the controllable circuit breaker CB3 and the inverter outlet transformer are connected in series in sequence, the controllable circuit breaker CB2 is connected in parallel with the current limiting reactor X1, and the current limiting reactor A short-circuit reactor X2 is connected to the line between X1 and the controllable circuit breaker CB3 through the controllable circuit breaker CB4. The invention is connected in series between the photovoltaic inv...

Embodiment 2

[0047] as attached figure 2 As shown, a voltage transformer PT1 is set on the line between the controllable circuit breaker CB1 and the power grid, a switch QS1 is set between the voltage transformer PT1 and the controllable circuit breaker CB1, and on the rear side of the controllable circuit breaker CB1 A current transformer CT1 is provided; a switch QS2 is arranged in series behind the controllable circuit breaker CB2, and the current-limiting reactor X1 shown is connected in parallel with the controllable circuit breaker CB2 and the switch QS2; at the front and rear sides of the controllable circuit breaker CB3 A switch QS3 and a current transformer CT3 are respectively connected in series;

[0048] A voltage transformer PT4 is arranged in series on the front side of the current transformer CT4. There are three current transformers CT4 and they are respectively located in three lines. A switch QS4 and a current transformer are respectively connected in series on both side...

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Abstract

The invention relates to a low-voltage ride-through detection device for photovoltaic power generation compatible with dual voltage levels, which includes a photovoltaic inverter and a power grid connected in series, including a controllable circuit breaker CB1 and a current-limiting reactor connected in series from the power grid side X1, controllable circuit breaker CB3 and inverter outlet transformer, controllable circuit breaker CB2 and current-limiting reactor X1 in parallel, there is a short circuit between current-limiting reactor X1 and controllable circuit breaker CB3 through controllable circuit breaker CB4 Reactor X2; the present invention adopts the design of impedance voltage division, and realizes the voltage drop at the outlet transformer of the photovoltaic inverter by changing the voltage division ratio between the current-limiting reactor X1 and the short-circuit reactor X2, and completes the control of the photovoltaic inverter. For the test of low voltage ride-through performance, the insulation and withstand voltage are selected according to 35kV, and the current is selected according to 10kV, so that the detection device can be used for low voltage ride-through detection of photovoltaic power generation with dual voltage levels of 10kV and 35kV.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic power generation, in particular to a low-voltage ride-through detection device for photovoltaic power generation compatible with dual voltage levels. Background technique [0002] Energy is the material basis for the survival of human society, the source of power to promote social development, and has an important impact on world economic development and national stability and security. According to reliable surveys, coal reserves around the world will be exhausted in the next 230 years, while oil and natural gas can only be consumed for 30-60 years. However, with the continuous growth of the world population and the continuous development of the global economy, the demand for energy in human society is increasing day by day. Therefore, the country attaches great importance to the utilization of renewable energy, and has successively issued a series of supporting policies, management regulat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02S50/00
CPCH02S50/00Y02E10/50
Inventor 王磊胡文平周文胡雪凯梁纪峰郭捷杨少波李卓君
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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