Relay fault detection method for grid-connected inverter

A relay failure and detection method technology, applied in the direction of circuit breaker testing, etc., can solve the problems of cumbersome and complicated steps, and achieve the effect of optimizing and reducing the detection steps

Active Publication Date: 2020-01-17
AISWEI NEW ENERGY TECHNOLOGY (YANGZHONG) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing relay fault detection method steps are relatively cumbersome and complicated. Optimizing the logic method and steps of relay fault detection is one of the problems that need to be solved in the field of inverters.

Method used

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  • Relay fault detection method for grid-connected inverter
  • Relay fault detection method for grid-connected inverter

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Embodiment Construction

[0021] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted here that the descriptions of these embodiments are used to help understand the present invention, but are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not constitute a conflict with each other.

[0022] The first to fifth thresholds (Delta1 to Delta5) mentioned in this article are based on the values ​​obtained from the tests when the grid-connected inverter system is running and are set after considering a certain margin. The thresholds corresponding to different grid-connected inverters are different from each other.

[0023] This embodime...

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Abstract

The invention discloses a relay fault detection method for a grid-connected inverter. The method comprises the steps of: enabling resistors to be connected in parallel between inverter relays Relay1 and Relay2 and grid-side inverters Relay3 and Relay4, and carrying out the sampling of two sides of each resistor to obtain a Relay sampling signal; performing driving to disconnect all the relays, anddetermining whether the relay Relay3 on the power grid side has an adhesion fault or not or whether the relay Relay3 and the relay Relay4 simultaneously have an adhesion fault or not; driving the relay Relay3 on the power grid side to be closed; determining whether the relay Relay4 on the power grid side has an adhesion fault or not, outputting an open-loop voltage on the inverter side, performing driving to disconnect the relay Relay3 on the power grid side, and determining whether the relay Relay1 on the inverter side has an adhesion fault or whether the relay Relay1 and the relay Relay2 have an adhesion fault or not; outputting an open-loop voltage on the inverter side to drive the relay Relay1 and the relay Relay2 on the inverter side to be closed, and determining whether the relay Relay1 and / or the relay Relay2 of the inverter cannot be closed or not; and closing the open-loop voltage of the inverter side, driving the relay Relay1 and the relay Relay2 on the inverter side to be disconnected, closing the relay Relay3 and the relay Relay4 on the power grid side, and determining whether the relay Relay3 and / or the relay Relay4 on the power grid side cannot be closed or not. Thedetection steps are reduced.

Description

technical field [0001] The invention belongs to the field of inverter relay detection and relates to a relay fault detection method of a grid-connected inverter. Background technique [0002] In the field of grid-connected power generation system, the first premise is to be able to accurately judge the quality of the relay at the grid end. Because the relay needs to transmit a large current, especially the grid-connected inverter that has been used for a long time, it is easy to cause the metal contacts in the relay to stick and cannot be disconnected in time, which may bring a series of uncontrollable factors. Therefore, it is necessary to identify whether each relay is stuck or whether it can be closed. The steps of the existing relay fault detection methods are cumbersome and complicated, and optimizing the logic method and steps of relay fault detection is one of the problems to be solved in the field of inverters. Contents of the invention [0003] In order to solve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/327
CPCG01R31/327
Inventor 孙佳明
Owner AISWEI NEW ENERGY TECHNOLOGY (YANGZHONG) CO LTD
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