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METHOD FOR INRUSH CURRENT REDUCTION AND CONTROL AT START UP IN SOLAR FARMS

IP.com Disclosure Number: IPCOM000236220D
Publication Date: 2014-Apr-12
Document File: 3 page(s) / 28K

Publishing Venue

The IP.com Prior Art Database

Abstract

Described herein is a technique to provide a transformer with magnetization current from an inverter before synchronizing and connecting the transformer to a grid. The technique involves modification of the startup procedure of the inverter to provide magnetizing current to the transformer from a solar array before connecting the transformer to the grid.

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METHOD FOR INRUSH CURRENT REDUCTION AND CONTROL AT START UP IN SOLAR FARMS

 

BRIEF ABSTRACT

Described herein is a technique to provide a transformer with magnetization current from an inverter before synchronizing and connecting the transformer to a grid. The technique involves modification of the startup procedure of the inverter to provide magnetizing current to the transformer from a solar array before connecting the transformer to the grid.

 KEYWORDS

Transformer, inverter, magnetized current, grid, solar


DETAILED DESCRIPTION

When a photovoltaic (PV) inverter connects to a weak grid, in rush current of a medium voltage (MV) transformer at start up results in a large voltage drop. When the large voltage drop is higher than 15% for more than 1.5 cycles, these conditions may cause loads to trip and the grid to become unstable. Additionally, the magnetizing current may generate high losses in the transformer and potentially cause transformer failure or excite resonance poles in the grid when no precautions are taken.

A conventional technique to address in rush current utilizes additional components such as fuse resistors in series and a circuit breaker connected to the high voltage (HV) transformer. This technique, however, is expensive due to the cost of the additional fuse resistors and circuit breakers.

Therefore, there is a need in the art for an economical technique to reduce in rush current to the grid.

The proposed technique is to provide a transformer with magnetization current from an inverter before synchronizing and connecting the transformer to a grid. The technique involves modification of the inverter start up procedure to provide magnetizing current to the transformer from a solar array before connecting the transformer to the grid. During the start up procedure, the inverter and switchgear of the medium...