#Hitachi Energy Ltd

SYSTEM AND METHOD TO CONTROL ELECTRIC VEHICLE FLEET CHARGING OR MICROGRID OPERATION CONSIDERING A HEURISTIC APPROACH TO EXTEND BATTERY LIFE

Conventional optimization models for electric vehicle (EV) charging do not sufficiently account for battery wear. Accordingly, disclosed embodiments utilize a heuristic approach to penalize optimizati…

DRIVE·3d ago·1 min read

B60L53/62 Hitachi Energy Ltd

Power transformer

A power transformer, including a core and a winding is provided. The core includes a limb and a yoke. The winding is wound around the limb and has an extension along a main axis of the limb. The power…

DRIVE·5d ago·1 min read

H01F27/40 Hitachi Energy Ltd

OPTIMIZED CONTROL OF POWER DEPOTS USING MULTI-TENANT CHARGING SYSTEM-OF-SYSTEMS

Optimization of independently operated power infrastructure sites, such as electric vehicle (EV) depots, can result in sub-optimal operation across a plurality of power infrastructure sites. Disclosed…

DRIVE·Jun 11·1 min read

B60L53/64 Hitachi Energy Ltd

A CONTROL SYSTEM CONFIGURED FOR, AND A METHOD FOR, EMULATING A VIRTUAL SYNCHRONOUS MACHINE OF A GRID-FORMING VOLTAGE SOURCE CONVERTER

A method for grid forming control using a voltage source converter (VSC), connected to a grid at a point-of-common-coupling (PCC), is provided. The method comprises calculating a converter voltage ref…

DRIVE·May 14·2 min read

H02J3/48 Hitachi Energy Ltd

ELECTRICAL PROTECTION CIRCUIT FOR ENERGY STORAGE UNIT

Embodiments herein provide an electrical protection circuit () for connecting an Energy Storage Unit, ESU () to a main power line (). The electrical protection circuit () comprises first and second ma…

DRIVE·May 7·1 min read

H02H3/033 Hitachi Energy Ltd

POWER CONTROL SYSTEM FOR POWER NETWORK

Embodiments herein provide a power control system () for controlling reactive power and/or active power in a power network. The power control system () is operatively coupled to the power network at a…

DRIVE·Apr 30·2 min read

H02J3/1842 Hitachi Energy Ltd

A PROTECTION METHOD FOR AN ELECTRICAL DISTRIBUTION SYSTEM

A method and a controller for protecting an electrical distribution system are disclosed. The electrical distribution system comprises an electrical grid being electrically coupled to an electrical br…

DRIVE·Apr 23·1 min read

G01R31/086 Hitachi Energy Ltd

METHOD FOR MONITORING THE STATUS OF A PLURALITY OF BATTERY CELLS IN AN ENERGY STORAGE SYSTEM

A method for monitoring a status of an energy storage system connected to a power converter is disclosed. The energy storage system comprises a plurality of interconnected energy storage cells, and th…

DRIVE·Mar 5·1 min read

G01R31/396 Hitachi Energy Ltd

AN ENERGY STORAGE SYSTEM FOR A DIRECT CURRENT TRANSMISSION SYSTEM AND A METHOD FOR EXCHANGING ENERGY WITH A DIRECT CURRENT TRANSMISSION SYSTEM

There is disclosed herein an energy storage system for a direct current (DC) transmission system, the energy storage system being configured to be connected to a DC link. The energy storage system com…

DRIVE·Jan 8·2 min read

H02J3/24 Hitachi Energy Ltd

METHOD TO OPERATE A SYSTEM COMPRISING AN ENERGY STORAGE SYSTEM

There is disclosed herein a method to operate a system comprising an energy storage system (ESS) and a converter. The ESS being connected to the converter such that a DC-side of the converter forms DC…

DRIVE·Sep 4·1 min read

H02J3/28 Hitachi Energy Ltd

ADAPTIVE POWER OSCILLATION DAMPING CONTROLLER FOR A GRID-FORMING CONVERTER

The present disclosure provides a method and a control unit for controlling a power unit connected at a connection point to a power grid. The method comprises obtaining a power oscillation damping (PO…

DRIVE·May 29·2 min read

H02J3/241 Hitachi Energy Ltd

AUXILIARY POWER SUPPLY FOR ENERGY STORAGE SYSTEMS

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 po…

DRIVE·May 29·1 min read

H02J11/00 Hitachi Energy Ltd

AN ARRANGEMENT COMPRISING ENERGY STORAGE UNITS AND A RELATED METHOD

An arrangement is disclosed, comprising a series connection of a plurality of energy storage units, a plurality of bypass circuits, each bypass circuit being configured to bypass a respective one of t…

DRIVE·Oct 10·1 min read

H02J7/0016 Hitachi Energy Ltd

CAPACITOR COMPENSATED THYRISTOR CONTROLLED BRAKING RESISTOR

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…

DRIVE·Oct 3·1 min read

H02J3/00125 Hitachi Energy Ltd

METHOD AND SYSTEM FOR DECENTRALIZED ENERGY FORECASTING AND SCHEDULING

A method for adjusting electrical energy flow schedules of a utility handling a plurality of distributed energy resources. The method comprising the steps of providing information regarding energy flo…

DRIVE·Sep 26·1 min read

G06Q50/06 Hitachi Energy Ltd

MODULE FOR LARGE SCALE ENERGY STORAGE

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 supercapacito…

DRIVE·Aug 8·1 min read

H02J7/00304 Hitachi Energy Ltd

ENERGY SUPPORTING DEVICE

An energy supporting device for a high voltage direct current, HVDC, transmission system is provided. The HVDC transmission system includes a first HVDC converter and a second HVDC converter connected…

DRIVE·Aug 8·2 min read

H02J3/36 Hitachi Energy Ltd

A MONITORING SYSTEM FOR AN ELECTRICAL TRANSMISSION AND/OR DISTRIBUTION NETWORK

A monitoring system for an electrical transmission and/or distribution network is disclosed. The system comprises a short-range wireless transceiver arranged at a predetermined position relative to an…

DRIVE·Jun 27·1 min read

H02J50/90 Hitachi Energy Ltd