Compatible photovoltaic inverter low-voltage ride-through detection device and reactor determination method thereof

Abstract

The invention discloses a compatible photovoltaic inverter low-voltage ride-through detection device and a reactor determination method thereof. The compatible photovoltaic inverter low-voltage ride-through detection device comprises a current limiting reactor, a short-circuit reactor, a current transformer, a switch and a drop type switching cabinet. The A end of the CT1 is connected with one end of the main transformer through the CB1, the B end of the CT1 is connected with the A end of the current limiting reactor, the B end of the current limiting reactor is connected with the A end of the short-circuit reactor and the A end of the CT4, the B end of the CT4 is connected with the tested photovoltaic inverter through the CB4, and the B end of the short-circuit reactor is connected with the drop type switching cabinet after being connected with the CB3 and the CT3 in series; and a series circuit of the CB2 and the CT2 is connected in parallel between the B end of the CB4 and the A end of the CB1. The compatibility of the reactor in the photovoltaic inverter low-voltage ride-through detection system is realized, the detection level and the utilization rate of low-voltage ride-through detection are improved, and the detection cost is reduced.

Description

technical field [0001] The invention relates to a photovoltaic inverter low-voltage ride-through detection device and a reactor determination method thereof, in particular to a photovoltaic inverter low-voltage ride-through detection device and a reactor determination method thereof. Background technique [0002] With the rapid growth of photovoltaic power generation, in order to solve the technical problems of large-scale access to photovoltaic power generation in my country and ensure the safe and stable operation of the power grid, it is urgent to carry out research on low-voltage ride-through detection technology for large-capacity photovoltaics. Photovoltaic power generation is an unstable power source with strong volatility, randomness, and intermittency. Large-scale access will bring many adverse effects to the safe and stable operation of the power grid, mainly manifested in grid stability problems and power quality problems: When a large disturbance occurs in the po...

AI Technical Summary

Problems solved by technology

Photovoltaic power generation is an unstable power source with strong volatility, randomness, and intermittency. Large-scale access will bring many adverse effects to the safe and stable operation of the power grid, mainly manifested as grid stability problems and power quality problems: When a large disturbance occurs in the power grid, if the photovoltaic inverter does not have low-voltage ride-through capability, it will cause a large area to be disconnected from the grid, which will bring a secondary impact on the grid and affect the transient stability of the grid.

The photovoltaic low-voltage ride-through mobile detection system using reactors as the main equipment generally uses a set of detection equipment for 10kV power grids, a set of detection equipment for 35kV power grids, or the same set of equipment for breaking devices in the detection system, and a set of 10kV devices for reactors , a set of 35kV devices, the two are not compatible

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