System to energise electrical loads (200) with alternating current in a photovoltaic plant (300), with the photovoltaic plant (300) comprising a main DC power line (301), a photovoltaic generator (302) comprising a photovoltaic circuit (303) that is made up of one or more photovoltaic strings (304) connected in parallel to the main DC power line (301) and is able to generate a first direct current (IDC1) and a direct DC voltage, and, a main AC power line (305) connected to an electric distribution network (306). The system (100) comprises a converter apparatus (109) adapted to be connected to the main AC power line (305) and to the main DC power line (301) and configured to convert an alternating current circulating in the main AC power line (305) into a second direct current (IDC2), feeding the latter into the photovoltaic circuit (303) through the main DC power line (301) if the DC voltage generated by the photovoltaic generator (302) is lesser than a pre-set limit, so as to energise the photovoltaic generator (302). The system (100) moreover comprises a DC/AC secondary converter (106) adapted to be connected at the input to a secondary DC power line (104) which is connected to the connectors of a photovoltaic module (308) of the photovoltaic generator (302), or of a circuit formed by a plurality of said photovoltaic modules (308) connected to one another in series, and at the output to the electrical load (200), the DC/AC secondary converter (106) being configured to convert a direct current circulating in the secondary DC power line (104) into an alternating supply current (IAC), feeding the latter into the electrical load (200) so as to energise it.

System to energise electrical loads (200) with alternating current in a photovoltaic plant (300), with the photovoltaic plant (300) comprising a main DC power line (301), a photovoltaic generator (302) comprising a photovoltaic circuit (303) that is made up of one or more photovoltaic strings (304) connected in parallel to the main DC power line (301) and is able to generate a first direct current (IDC1) and a direct DC voltage, and, a main AC power line (305) connected to an electric distribution network (306). The system (100) comprises a converter apparatus (109) adapted to be connected to the main AC power line (305) and to the main DC power line (301) and configured to convert an alternating current circulating in the main AC power line (305) into a second direct current (IDC2), feeding the latter into the photovoltaic circuit (303) through the main DC power line (301) if the DC voltage generated by the photovoltaic generator (302) is lesser than a pre-set limit, so as to energise the photovoltaic generator (302). The system (100) moreover comprises a DC/AC secondary converter (106) adapted to be connected at the input to a secondary DC power line (104) which is connected to the connectors of a photovoltaic module (308) of the photovoltaic generator (302), or of a circuit formed by a plurality of said photovoltaic modules (308) connected to one another in series, and at the output to the electrical load (200), the DC/AC secondary converter (106) being configured to convert a direct current circulating in the secondary DC power line (104) into an alternating supply current (IAC), feeding the latter into the electrical load (200) so as to energise it.

A hydraulic fracturing system for fracturing a subterranean formation is disclosed. In an embodiment, the system may include a plurality of electric pumps fluidly connected to a well associated with the subterranean formation and powered by at least one electric motor, and configured to pump fluid into a wellbore associated with the well at a high pressure so that the fluid passes from the wellbore into the subterranean formation and fractures the subterranean formation; at least one generator electrically coupled to the plurality of electric pumps so as to generate electricity for use by the plurality of electric pumps; and at least one switchgear electrically coupled to the at least one generator and configured to distribute an electrical load between the plurality of electric pumps and the at least one generator.

The invention relates to a control apparatus and method for controlling the rotor blades of a wind turbine, and in particular to controlling the rotor blades during an extreme wind event. An extended mode of operation of the wind turbine rotor beyond the cut-out wind speed is provided. In the extended mode of operation, the pitch of the wind turbine blades is actively controlled so that the rotor and the generator idle at a designated rotational speed. The rotational speed may be relatively high, say 15 to 20% of the nominal speed, compared with minimal speeds experienced by purely feathered wind turbine blades, and may be further controlled as a function of the incident wind speed. Output power control in the extended mode may be zero but is preferably a low, but non-zero value. The output power so produced may then be used as an auxiliary power source for controlling the wind turbine in situations where the utility grid fails.

The invention relates to a control apparatus and method for controlling the rotor blades of a wind turbine, and in particular to controlling the rotor blades during an extreme wind event. An extended mode of operation of the wind turbine rotor beyond the cut-out wind speed is provided. In the extended mode of operation, the pitch of the wind turbine blades is actively controlled so that the rotor and the generator idle at a designated rotational speed. The rotational speed may be relatively high, say 15 to 20% of the nominal speed, compared with minimal speeds experienced by purely feathered wind turbine blades, and may be further controlled as a function of the incident wind speed. Output power control in the extended mode may be zero but is preferably a low, but non-zero value. The output power so produced may then be used as an auxiliary power source for controlling the wind turbine in situations where the utility grid fails.

In accordance with some embodiments, the present disclosure is directed to systems having a fuel cell and a turbine generator, each capable of providing electrical power to a utility grid, and methods for operating the same. The system may have a main AC bus which is coupleable to the utility grid. The fuel cell may be coupled to main AC bus through an inverter. The turbine generator may be coupled to the main AC bus through a series of inverters, one of which may include the inverter by which the fuel cell is connected to the main AC bus. One or more load banks may be provided to provide a load for electrical power generated from the fuel cell, turbine generator, or both in case the system is disconnected from the utility grid. Further support and backup systems may be provided.

In accordance with some embodiments, the present disclosure is directed to systems having a fuel cell and a turbine generator, each capable of providing electrical power to a utility grid, and methods for operating the same. The system may have a main AC bus which is coupleable to the utility grid. The fuel cell may be coupled to main AC bus through an inverter. The turbine generator may be coupled to the main AC bus through a series of inverters, one of which may include the inverter by which the fuel cell is connected to the main AC bus. One or more load banks may be provided to provide a load for electrical power generated from the fuel cell, turbine generator, or both in case the system is disconnected from the utility grid. Further support and backup systems may be provided.

An energy storage system is presented. The energy storage system includes a primary energy storage device operatively couplable to a main bus, where the main bus is operatively coupled to a power generation device. Further, the energy storage system includes an auxiliary bus operatively couplable to the main bus and a grid bus. Furthermore, the energy storage system includes a plurality of auxiliary loads operatively coupled to the auxiliary bus and a housing configured to encompass the primary energy storage device, the auxiliary bus, and the plurality of auxiliary loads, where the auxiliary bus is configured to supply power to the plurality of auxiliary loads from the primary energy storage device, the power generation device, a grid, or combinations thereof.

The present invention relates to extracting power from a current-carrying conductor's magnetic field and regulate to a stable DC voltage power source. The regulated DC voltage can be used to power the internal electronic circuitry of the power supply unit (PSU) and for powering external measurement devices and/or surveillance equipment's mounted into the device housing or onto the current-carrying conductors, such as phase wire, along with the PSU.

A distribution board includes: a pack housing unit which houses a battery pack and includes a connecting unit; and a charge control unit. The battery pack includes a connecting terminal unit for charge and discharge of power and can supply power to the distribution board and another device different from the distribution board. The connecting unit is connectable to and disconnectable from the connecting terminal unit. The charge control unit converts AC power supplied from a power system into DC power, and supplies the DC power to the battery pack housed in the pack housing unit to charge the battery pack.