Hitachi Energy Ltd

Abb Research Ltd.

Hitachi Energy Switzerland Ag

Gunnar Ingeström

Lexuan Meng

Tong Wu

Tomas Lars Jonsson

Jan Svensson

Theodore Soong

Juergen Steinke

Haofeng Bai

Mohsen Asoodar

Jan Kheir

Jon Rasmussen

A system () for stabilising a power grid (), comprising a generator (), configured to provide power to the power grid (), the power having an active power component and a reactive power component, and a power line (), configured to transmit power from the generator () to the power grid (). The system () comprises a thyristor controlled braking resistor (TCBR) () arranged on the power line (), and a capacitor () electrically connected in series with the TCBR (). The TCBR () absorbs at least a portion of the reactive power component from the generator () during a fault on the power line () and the capacitor () is configured to compensate for the at least a portion of the reactive power component absorbed by the TCBR ().

Capacitor compensated thyristor controlled braking resistor

There is disclosed herein an energy storage system comprising an energy storage circuit, comprising a string of interconnected energy storage units configured to store electrical energy and provide power to a power grid using said stored electrical energy. The ESS further comprises an auxiliary module configured to provide auxiliary functions for at least one of the plurality of energy storage units, and an auxiliary power supply circuit for providing power to the auxiliary module from a grounded power source. The auxiliary power supply circuit is configured to galvanically isolate the energy storage circuit from the grounded power source, thereby preventing electrical arcing between the ESS, which may be at a high voltage, and ground at the grounded power source.

Auxiliary power supply for energy storage systems

A module () for use in an energy storage system is provided, including a first terminal () and a second terminal (); a supercapacitor branch () including an arrangement () of one or more supercapacitors (), and a resistive bypass branch () including at least a first bypass switch () and a resistance () connected in series. The supercapacitor branch and the resistive bypass branch are connected in parallel between the first terminal and the second terminal. The module may further include a direct bypass branch () having a second bypass switch (), the direct bypass branch being also connected in parallel with the supercapacitor branch () between the first and second terminals. A control method of such a module and an energy storage system including several such modules, are also provided.

Module for large scale energy storage

A power supporting arrangement for a power grid includes a first and a second voltage source converter with an AC side and a DC side. A DC link interconnects the DC sides of the voltage source converters. A first switching arrangement includes a number of settable positions. The AC side of the second voltage source converter is connected to the power grid and the first switching arrangement is connected between a first synchronous machine. The AC side of the first voltage source converter and the power grid and operable to selectively connect the first synchronous machine to the power grid or to the AC side of the first voltage source converter.

Power supporting arrangement for a power grid

A thyristor controlled series capacitor module including a capacitor connectable in series with a power line, a thyristor valve connected in parallel with the capacitor, a breaker connected in parallel with the thyristor valve, and an inductor. By providing a simplified breaker arrangement, the number of components is reduced.

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Västerås, Sweden

Gunnar Ingeström