Self-checking method and system applied to network side relay topology in energy storage inverter

An energy storage inverter and relay technology, applied in emergency power supply arrangement, AC network circuit, photovoltaic power generation, etc., can solve the problems of rarely considering certification standards, high reliability, and insufficient attention to self-checking methods.

Pending Publication Date: 2020-10-27
YANGZHOU UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The current grid-connected inverter already has a mature relay self-inspection scheme, but insufficient attention has been paid to the self-inspection method of the photovoltaic energy storage inverter that has just emerged in my country, especially the relatively complex relay topology network in the energy storage system. The current technology only f

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  • Self-checking method and system applied to network side relay topology in energy storage inverter
  • Self-checking method and system applied to network side relay topology in energy storage inverter
  • Self-checking method and system applied to network side relay topology in energy storage inverter

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Embodiment Construction

[0054] A self-inspection method of the present invention applied to grid-side relay topology in energy storage inverters, the components involved are as follows figure 1 Grid-side relay topology 1 is shown. figure 2 is a schematic diagram of the implementation of grid-side relay topology 1 in the main circuit 2 of the energy storage inverter, figure 2 The main circuit 2 of the energy storage inverter shown is composed of MPPT controller, battery bidirectional charging and discharging circuit, inverter and grid-side relay topology 1. The energy storage inverter generally has 4 ports, which are respectively connected to PV components, storage energy battery, grid and backup loads, while the figure 2 The general load in the system is directly connected in parallel with the power grid. If the power grid is cut off, the general load will lose power.

[0055] figure 1 and figure 2 The grid-side relay topology 1 in the network is composed of 6 relays K1, K2, K3, K4, K5 and K6...

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Abstract

The invention discloses a self-checking method and system applied to network side relay topology in an energy storage inverter, and belongs to the technical field of power electronics and electricians. A relay combination detection method is adopted. When a power grid is normal, the network side relay topology needs to be self-checked before the energy storage inverter operates normally, and the inverter in a main circuit of the energy storage inverter does not work at the moment, and the method comprises the following three steps: 1, detecting whether a short-circuit fault and an open-circuitfault happen to a contact of a first bridge arm of the network side relay topology or not; 2, detecting whether a short-circuit fault and an open-circuit fault happen to a contact of a second bridgearm of the network side relay topology or not; 3, detecting whether a short-circuit fault and an open-circuit fault happen to a contact of a third bridge arm of the network side relay topology or not;the method is simple and reliable, can be applied to a digitally controlled energy storage inverter system, and is easy to program and implement.

Description

technical field [0001] The invention relates to an energy storage inverter system, in particular to a grid-side relay circuit in the energy storage inverter system, which belongs to the technical field of power electronics and electric engineering. Background technique [0002] The main working modes of the photovoltaic energy storage inverter system include grid-connected operation mode and off-grid operation mode, which have both the characteristics of photovoltaic power generation and UPS. The grid-connected operation mode includes enabling the energy of the inverter to flow to the grid, and the energy of the grid to flow to the backup load; when the grid fails and enters the off-grid operation mode, the photovoltaic energy storage inverter system needs to cut off the grid and control the energy of the inverter to flow to the backup load. Realize the uninterrupted power supply of backup load. This requires placing a relay network on the grid side of the energy storage in...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/32H02J9/06H02H7/26G01R31/52G01R31/54
CPCG01R31/52G01R31/54H02H7/26H02J3/32H02J3/381H02J9/062H02J2300/24Y02E10/56
Inventor 方宇江杰叶融蒋伟汤伟孟飞王正群
Owner YANGZHOU UNIV
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