This disclosure relates to a hierarchical power control system linked to a cloud server comprising a first microgrid cell including a first ESS equipped with a UPS structure and a first load with a power state managed by the first ESS; a second microgrid cell including a second load and a second ESS that manages a power state of the second load; a third microgrid cell including a third load; an emergency cell including an additional ESS equipped with a UPS structure and an additional emergency generator, and selectively connected to the second microgrid cell; a middleware server which communicates with the first to third microgrid cells and the emergency cell; and an integrated control system for receiving power supply state information of the first to third microgrid cells, and establishing an integrated operation schedule based on the received power supply state information of the first to third microgrid cells.

A method of synchronizing a generator (3) with a power supply grid (4) having a grid frequency including the following steps: f) mechanically driving the generator (3) by means of an internal combustion engine (2), in particular a gas engine, creating a generator rotary speed corresponding to a generator frequency generated by the generator (3) at the prevailing generator rotary speed, g) closed-loop or open-loop control of the internal combustion engine (2) such that the generator frequency is in a tolerance range, wherein the grid frequency is within the tolerance range, h) detecting a phase angle difference between a current generated by the generator (3) and/or a voltage generated by the generator (3) on the one hand and a grid current and/or a grid voltage on the other hand, i) synchronizing the voltage generated by the generator (3) and/or the current generated by the generator (3) on the one hand with the grid voltage and/or the grid current on the other hand by the phase angle difference (Δφ) being reduced, in particular minimized, and j) electrically connecting the generator (3) to the power supply grid (4), wherein at least one temporary change in an ignition timing of at least one cylinder unit (9) of the internal combustion engine (2) is performed to reduce the phase angle difference (Δφ).

A method of synchronizing a generator (3) with a power supply grid (4) having a grid frequency including the following steps: f) mechanically driving the generator (3) by means of an internal combustion engine (2), in particular a gas engine, creating a generator rotary speed corresponding to a generator frequency generated by the generator (3) at the prevailing generator rotary speed, g) closed-loop or open-loop control of the internal combustion engine (2) such that the generator frequency is in a tolerance range, wherein the grid frequency is within the tolerance range, h) detecting a phase angle difference between a current generated by the generator (3) and/or a voltage generated by the generator (3) on the one hand and a grid current and/or a grid voltage on the other hand, i) synchronizing the voltage generated by the generator (3) and/or the current generated by the generator (3) on the one hand with the grid voltage and/or the grid current on the other hand by the phase angle difference (Δφ) being reduced, in particular minimized, and j) electrically connecting the generator (3) to the power supply grid (4), wherein at least one temporary change in an ignition timing of at least one cylinder unit (9) of the internal combustion engine (2) is performed to reduce the phase angle difference (Δφ).

SOGI based apparatus and methods for providing balanced three phase output signals free of harmonics, DC components and imbalance present in the input signals, are disclosed. In addition, such apparatus and methods for providing corresponding output signals which are drift-free integrals of the input signals and which signals may enable the control of a power electronics inverter for improved and robust grid power injection and for motor control are disclosed.

The present disclosure relates to a recloser control that provides autosynchronization of a microgrid to an area electric power system (EPS). For example, a recloser control may include an output connector that is communicatively coupled to a recloser at a point of common coupling (PCC) between the area EPS and the microgrid. The recloser control may include a processor that acquires a first set of measurements indicating electrical characteristics of the area EPS and acquires a second set of measurements indicating electrical characteristics of the microgrid. The recloser control may send synchronization signals to a microgrid controller to synchronize the microgrid controller based on the first set of measurements and the second set of measurements.

The present disclosure relates to a recloser control that provides autosynchronization of a microgrid to an area electric power system (EPS). For example, a recloser control may include an output connector that is communicatively coupled to a recloser at a point of common coupling (PCC) between the area EPS and the microgrid. The recloser control may include a processor that acquires a first set of measurements indicating electrical characteristics of the area EPS and acquires a second set of measurements indicating electrical characteristics of the microgrid. The recloser control may send synchronization signals to a microgrid controller to synchronize the microgrid controller based on the first set of measurements and the second set of measurements.

The invention concerns a method for coupling to the grid a hydraulic unit having a synchronous generator, a runner, and wicket gates, the method comprises: a) a step of increasing the flow of water into the runner from a time t.sub.0 to a time t.sub.1 so that the rotation frequency of the rotor of the synchronous generator is, at time t.sub.1 equal to the frequency of the grid; b) a step of closing the circuit breaker at time t.sub.1, step a) further comprises a sub-step a1) executed from a time t.sub.2 to time t.sub.1, wherein the flow of water is adjusted so that, at time t.sub.1, the phase of the synchronous generator is aligned with the grid phase.

The invention concerns a method for coupling to the grid a hydraulic unit having a synchronous generator, a runner, and wicket gates, the method comprises: a) a step of increasing the flow of water into the runner from a time t.sub.0 to a time t.sub.1 so that the rotation frequency of the rotor of the synchronous generator is, at time t.sub.1 equal to the frequency of the grid; b) a step of closing the circuit breaker at time t.sub.1, step a) further comprises a sub-step a1) executed from a time t.sub.2 to time t.sub.1, wherein the flow of water is adjusted so that, at time t.sub.1, the phase of the synchronous generator is aligned with the grid phase.

The present invention relates to PMU-based control systems for dampening inter-area oscillations in large-scale interconnected power systems or grids to protect against a catastrophic blackout. The control systems receive phasor measurements from two or more locations on an AC transmission line and generates a power control command to a power resource on the grid.

The present invention relates to PMU-based control systems for dampening inter-area oscillations in large-scale interconnected power systems or grids to protect against a catastrophic blackout. The control systems receive phasor measurements from two or more locations on an AC transmission line and generates a power control command to a power resource on the grid.