A device for coupling a control unit with a voltage supply. An electrical connection between the voltage supply and the electrical control unit may be opened/closed with a switching element. An electrical resistor, which allows for a limited current flow from the voltage supply to the electrical control unit even when the switching element is open, is parallel to the switching element. Thus, an electrical energy store, such as a capacitor or a similar device, which is to buffer the input voltage at the electrical control unit, is chargeable even when the switching element is open. This is to avoid adverse effects caused by the charging of a capacitor at the input of the control unit when the switching element is closed.

A device for coupling a control unit with a voltage supply. An electrical connection between the voltage supply and the electrical control unit may be opened/closed with a switching element. An electrical resistor, which allows for a limited current flow from the voltage supply to the electrical control unit even when the switching element is open, is parallel to the switching element. Thus, an electrical energy store, such as a capacitor or a similar device, which is to buffer the input voltage at the electrical control unit, is chargeable even when the switching element is open. This is to avoid adverse effects caused by the charging of a capacitor at the input of the control unit when the switching element is closed.

An inventive protection arrangement is for a two-stroke internal combustion engine providing power to a generator having output lines with circuit breakers. The protection arrangement comprises a heat resistor bank and a circuit breaker for each output line. The circuit breaker is connected to the output line in a parallel manner with the circuit breaker of the same output line, and the resistor bank is connectable to the each output line via the circuit breaker of the output line. The protection arrangement further comprises a control unit having connections to the circuit breakers and the circuit breakers, in order to monitor the circuit breakers and to control the circuit breakers. In case the circuit breaker of at least one output line is tripped to open, the control unit is arranged to control the circuit breakers of the output lines to connect the heat resistor bank to output lines.

A wind turbine that includes a housing, an asynchronous generator disposed in the housing and configured to be electrically connected to a power grid connection; a power converter circuit disposed in the housing and configured to be electrically connected to the asynchronous generator; and a variable impedance device disposed in the housing, connected to the generator and configured to limit current by varying impedance in response to a transient current. The wind turbine delivers reactive power to the power grid when the variable impedance device varies impedance in response to the transient current. The variable impedance device can be arranged in series between the asynchronous generator and the power grid connection, or can be in a shunt arrangement between the asynchronous generator and a neural point.

A wind turbine that includes a housing, an asynchronous generator disposed in the housing and configured to be electrically connected to a power grid connection; a power converter circuit disposed in the housing and configured to be electrically connected to the asynchronous generator; and a variable impedance device disposed in the housing, connected to the generator and configured to limit current by varying impedance in response to a transient current. The wind turbine delivers reactive power to the power grid when the variable impedance device varies impedance in response to the transient current. The variable impedance device can be arranged in series between the asynchronous generator and the power grid connection, or can be in a shunt arrangement between the asynchronous generator and a neural point.

According to some embodiments, system and methods are provided, comprising an electrical installation; one of a permanent magnet motor and a permanent magnet generator; a circuit operative to provide current to operate one of the motor and the generator; one or more sensors coupled to the electrical installation, wherein the one or more sensors are operative to detect an overcurrent in the circuit and to generate an overcurrent signal; one or more inductors; and an inductance module control operative to: receive the overcurrent signal from the one or more sensors; determine how to insert one or more inductors to reduce an amplitude of the overcurrent; activate the one or more inductors based on the determination; and deactivate the one or more inductors when the overcurrent is not detected. Numerous other aspects are provided.

According to some embodiments, system and methods are provided, comprising an electrical installation; one of a permanent magnet motor and a permanent magnet generator; a circuit operative to provide current to operate one of the motor and the generator; one or more sensors coupled to the electrical installation, wherein the one or more sensors are operative to detect an overcurrent in the circuit and to generate an overcurrent signal; one or more inductors; and an inductance module control operative to: receive the overcurrent signal from the one or more sensors; determine how to insert one or more inductors to reduce an amplitude of the overcurrent; activate the one or more inductors based on the determination; and deactivate the one or more inductors when the overcurrent is not detected. Numerous other aspects are provided.

The proposed system for controlling electrical power generation includes power generating units each having an electrical generator parallel-connected to an electric grid via a circuit breaker, programmable control and protection means, and a primary power engine. At least one active loading device is connected to the grid parallel to the generator. The programmable control and protection means include a microprocessor-based excitation system, an automatic excitation regulation controller, and an electrical generator differential protection controller. The controllers are connected to one another and to the microprocessor-based excitation system, the circuit breaker and a plant computer for controlling the power generating units, the plant computer being the end point in a two-way wireless communication link with a dispatch computer for remotely controlling and monitoring the power generating units.

The proposed system for controlling electrical power generation includes power generating units each having an electrical generator parallel-connected to an electric grid via a circuit breaker, programmable control and protection means, and a primary power engine. At least one active loading device is connected to the grid parallel to the generator. The programmable control and protection means include a microprocessor-based excitation system, an automatic excitation regulation controller, and an electrical generator differential protection controller. The controllers are connected to one another and to the microprocessor-based excitation system, the circuit breaker and a plant computer for controlling the power generating units, the plant computer being the end point in a two-way wireless communication link with a dispatch computer for remotely controlling and monitoring the power generating units.

Detection and protection against electric power generator stator ground fault conditions in multiple-generator high-impedance grounded installations is provided herein. In one embodiment, a generator protection element may block a determination of a fault using third harmonic voltages when the third harmonic voltage from the generator is less than a factor of the maximum third harmonic voltage from all of the generators on the common bus. A tripping subsystem may issue a trip command based upon detection of a stator ground fault condition.