Methods, systems, and computer readable mediums for protecting and controlling a microgrid with a dynamic boundary are disclosed. One method includes detecting a fault in a microgrid that includes a dynamic point-of-common-coupling (PCC), in response to determining that the microgrid is operating in a grid-connected mode, isolating the fault by tripping a microgrid side smart switch and a grid side smart switch that are located immediately adjacent to the fault, initiating the reclosing of the grid side smart switch, and initiating the reclosing for the microgrid side smart switch via resynchronization if the grid side smart switch is successfully reclosed, and in response to determining that the microgrid is operating in an islanded mode, isolating the fault by tripping a microgrid side smart switch that is located immediately adjacent to the fault, and initiating the reclosing of the microgrid side smart switch.

A drive circuit of a voltage-controlled power semiconductor element, including first to fourth switching elements, first and second delay circuits, an overcurrent detection circuit, a slow shutdown detection circuit and a flip-flop. The first switching element turns on upon receiving an off signal. The second switching element is turned on by the first delayed signal generated by the first delay circuit. The third switching element turns on upon receiving a second delayed signal generated by the second delay circuit through the flip-flop. The fourth switching element is turned on by the slow shutdown detection signal generated by the slow shutdown detection circuit. The first to fourth switching elements extract electric charges from the gate terminal of the voltage-controlled power semiconductor element, with first to fourth extracting capabilities, respectively. The first and fourth extracting capabilities are larger than the third extracting capability and smaller than the second extracting capability.

Disclosed is an energy storage system having an arc monitoring function. The system includes: an outer casing storing an energy storage unit and a PCS therein; a sound sensor installed outside the outer casing to detect sound generated from an inside of the outer casing; a temperature and humidity sensor installed outside the outer casing to detect humidity and temperature of the outer casing; and an arc detection device analyzing a frequency of a sound generated in the energy storage unit and the PCS based on correlation between temperature and humidity to detect an arc signal included in the sound and monitoring an arc based on the detected arc signal.

A semiconductor device, including a control circuit that has a gate control circuit driving a power semiconductor element. The control circuit further includes a plurality of alarm detection circuits respectively detecting a plurality of abnormalities, a protection circuit stopping the gate control circuit responsive to the detection of any abnormality, an alarm signal generation circuit generating an alarm signal responsive to the detected abnormality, a warning detection circuit detecting a warning before any of the abnormalities is detected, and a pulse generation circuit generating a warning signal while the warning is being detected. The alarm signal is a one-shot pulse having a pulse width thereof corresponding to the detected abnormality, such that alarm signals generated responsive to different abnormalities have different pulse widths. The warning signal includes a plurality of successive pulses, each of which has a pulse width smaller than any of the pulse widths of the alarm signals.

Receive analog signal representing real-time electrical current of electrical power transmission/distribution line; sample and digitise analog signal to generate power line current data; generate data frames of subsets of the power line current data for successive overlapping time slices, process data frames to generate frequency domain data representing frequency components for different frequency ranges; process frequency domain data to generate energy data representing average energies of frequency ranges over corresponding time slice; generate two-dimensional feature for machine learning, first dimension represents plurality of the successive time slices, second dimension represents different frequency ranges, values of the two-dimensional feature represent logarithms of corresponding average energies of frequency components of electrical current over corresponding time slices; apply deep learning classifier to two-dimensional feature to detect high-impedance fault in electrical power transmission/distribution line, and if detected: send fault signal to relay or circuit breaker to cut power to the electrical power transmission/distribution line.

An electronic power distribution arrangement is disclosed which includes an electrical line for supplying power to a capacitive load; a first electronic switch for fusing the capacitive load; a second electronic switch for precharging the capacitive load prior to switching through the first electronic switch; a resistor connected in series with the second switchable current path of the second electronic switch, the series connection being connected in parallel with the first switchable current path of the first electronic switch; and a controller. The controller is adapted to turn on the second electronic switch to precharge the capacitive load before turning on the first electronic switch to supply power to the capacitive load, and to turn on the first electronic switch only when a voltage across the resistor reaches a threshold value.

A battery protection apparatus according to one or more embodiments includes a high voltage switch connected between a high voltage battery module and an external load, a battery configured to supply power to operate the high voltage switch, and a switch control circuit configured to output a signal to control the high voltage switch to be opened when an abnormality occurs in the battery.

A time-admittance fault detection and isolation system includes a series of time-admittance switches spaced apart along the power line, each including a respective time-admittance function. Together, the time-admittance functions define a cascade trip sequence in a downstream-to-upstream direction, which autonomously causes a closest upstream time-admittance switch to a fault to trip to isolate the fault on an upstream side of the fault without communication with the time-admittance switches. The fault detection and isolation system may also include a radio communicating a trip signal from the closest upstream time-admittance switch to the fault to a closest downstream time-admittance switch to the fault. The trip signal causes the closest downstream time-admittance switch to the fault to trip to isolate the fault on a downstream side of the fault. A tie switch closes to back-feed a portion of the electric power line downstream from the closest downstream time-admittance switch to the fault.

Protection system for limiting the impact of disruptions of an external urban or industrial electrical network on a local electrical network of a site which is connected to the external network and which includes at least one local electric power source, referred to as “local source” connected to the local network and capable of injecting the surplus electric power into the external network, with the protection system including a synchronous machine connected to the local network which is itself connected to the external network by way of a choke, referred to as “network choke.” The protection system includes at least a local choke which is associated with the local source and which is connected to the local network between this local source and the synchronous machine.

A device, system, and method is disclosed for improving safety of a power system. For example, a differential current may be detected using at least one sensor by temporarily enabling sampling of current flowing through one or more conductors. Additionally, current flow may be temporarily altered in order to sample current in a system. The measurements may be handled locally and/or remotely and appropriate actions may be taken to enhance the overall safety of the system.