State Of Charge Determination

A Device for determining the state of charge (SOC) of at least one battery comprising,

• an internal states prediction unit arranged to
• make an internal states prediction of said battery based on a model for the battery, where each internal state is related to the charge distribution in the battery,
• adjust said internal states prediction with measured properties of the battery, and
• apply said adjusted internal states prediction in the making of at least one following internal state prediction, and
• a state of charge determining unit arranged to provide the estimated state of charge (SOC) as a function of the predicted internal states.

A power compensator for an electric power transmission line comprising:

• a voltage source converter
• at least one battery, and
• a charge control device including
• a battery supply decision unit and
• a charge determination device including
• an internal states prediction unit, arranged to
• make an internal states prediction of said battery based on a model for the battery, where each internal state is related to the charge distribution in the battery
• adjust said internal states prediction with measured properties of the battery, and
• apply said adjusted internal states prediction in the making of at least one following internal state prediction, and
• a state of charge determining unit arranged to provide an estimated state of charge (SOC) as a function of the predicted internal states.

A computer program product for determining the state of charge (SOC) of at least one battery,

• comprising computer program code to make a device for determining the state of charge of the battery perform when said code is loaded into said device:
• make an internal states prediction of said battery based on a model for the battery,
• where each internal state is related to the charge distribution in the battery,
• adjust said internal states prediction with measured properties of the battery,
• apply said adjusted internal states prediction in the making of at least one following internal state prediction, and
• provide the estimated state of charge (SOC) as a function of the predicted internal states.