Low voltage ride through (LVRT) testing device for photovoltaic inverter

A low-voltage ride-through and photovoltaic inverter technology, applied in the field of power equipment, can solve the problems of large capacity, discontinuous voltage drop settings, and high energy consumption

Inactive Publication Date: 2015-12-30
ANQING NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing test device adopts the test method of impedance division. This test device has the disadvantages of discontinuous voltage drop setting, low test accuracy, large capacity, serious heat generation, high energy consumption, and cannot run for a long time.

Method used

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  • Low voltage ride through (LVRT) testing device for photovoltaic inverter

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Embodiment Construction

[0016] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings, and the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

[0017] Depend on figure 1 It can be seen that a photovoltaic inverter low-voltage ride-through test device in this embodiment includes a housing 1 and a ride-through test unit, the ride-through test unit is built in the housing 1, and the housing 1 is provided with an A port and a B port and C ports are respectively connected to the ride-through test unit built in the casing 1. The ride-through test device of this embodiment is connected to the three-phase AC side output by the photovoltaic inverter under test thr...

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PUM

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Abstract

The invention discloses a low voltage ride through (LVRT) testing device for a photovoltaic inverter. The LVRT testing device comprises a shell body and a ride through testing unit arranged inside the shell body. The shell body is provided with a port A, a port B and a port C, and the port A, the port B and the port C are connected with the ride through testing unit arranged inside the shell body. The LVRT testing device is connected with the side of a three-phase current output by the tested photovoltaic inverter through the port A, connected with the direct-current side of the tested photovoltaic inverter through the port B and connected with an external connection power grid through the port C. The ride through testing unit comprises a power analyzer, a three-phase transformer I, an AC-DC-AC convertor, a three-phase transformer II, a three-phase transformer III, a rectifier, a photovoltaic simulator, a wave recorder, a voltage / current sensor I, a voltage / current sensor II, a voltage / current sensor III, a voltage / current sensor IV and a touch screen. According to the technical scheme, the defects in the prior art are overcome, the dropout voltage can be set continuously and accurately, the tracking speed is high, the characteristic is hard, energy consumption is small, movable testing is achieved, and the requirements for testing precision and long-time operation are met.

Description

technical field [0001] The invention belongs to the field of electric equipment, and in particular relates to a photovoltaic inverter low-voltage ride-through test device. Background technique [0002] With the development of the industrial and agricultural economy, the access of various loads makes the environment of the distribution network increasingly complex, and the short-term drop of the grid voltage often occurs. The national grid guidelines require that photovoltaic grid-connected inverters cannot operate off-grid within a certain range at the moment of grid voltage drop, and contribute to grid voltage stability and fault ride-through. In order to test the low voltage ride through (LVRT) operation capability of the photovoltaic power generation system, it is necessary to construct a photovoltaic inverter low voltage ride through test device. At present, the existing test device adopts the test method of impedance division. This test device has the disadvantages of ...

Claims

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Application Information

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IPC IPC(8): H02S50/00
CPCY02E10/50
Inventor 吴文进苏建徽汪海宁
Owner ANQING NORMAL UNIV
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