TY - GEN

T1 - Enhanced method for voltage range controlled OLTC-equipped distribution transformers

AU - Reese, C.

AU - Buchhagen, C.

AU - Hofmann, L.

PY - 2012/7/1

Y1 - 2012/7/1

N2 - Increasing load and the growing proportion of injected power from distributed energy generation lead to higher loading of distribution grids. Without suitable improvements like e. g. additional cables or substations, violations of voltage constraints in low voltage distribution grids have to be expected. A further alternative is represented by on-load tap-changers (OLTC) which are combined with distribution transformers. This paper presents an enhanced method for controlling them using a voltage range as input parameter. The voltage drop or rise between the substation and the first nodes of the strings is taken into account as it can be determined with little effort. This enables the consideration of similar loading in the strings of a distribution grid. The results of the simulations prove the advantages compared to the underlying approach. The improved method features less switching operations which leads to less wear and accordingly to lower maintenance effort.

AB - Increasing load and the growing proportion of injected power from distributed energy generation lead to higher loading of distribution grids. Without suitable improvements like e. g. additional cables or substations, violations of voltage constraints in low voltage distribution grids have to be expected. A further alternative is represented by on-load tap-changers (OLTC) which are combined with distribution transformers. This paper presents an enhanced method for controlling them using a voltage range as input parameter. The voltage drop or rise between the substation and the first nodes of the strings is taken into account as it can be determined with little effort. This enables the consideration of similar loading in the strings of a distribution grid. The results of the simulations prove the advantages compared to the underlying approach. The improved method features less switching operations which leads to less wear and accordingly to lower maintenance effort.

KW - distributed power generation

KW - on load tap changers

KW - power distribution control

KW - power grids

KW - substations

KW - voltage control

KW - voltage range controlled OLTC

KW - distribution transformers

KW - distributed energy generation

KW - voltage constraints

KW - low voltage distribution grids

KW - voltage drop

KW - voltage rise

KW - Substations

KW - Voltage control

KW - Power cables

KW - Loading

KW - Low voltage

KW - Switches

KW - distribution grids

KW - distribution transformer

KW - OLTC

KW - on-load tap-changer

KW - low voltage level

KW - medium voltage level

KW - substation

U2 - 10.1109/PESGM.2012.6345416

DO - 10.1109/PESGM.2012.6345416

M3 - Conference contribution

SP - 1

EP - 8

BT - 2012 IEEE Power and Energy Society General Meeting

ER -