A solar power generation system includes a solar power generation device, a load device, and a control device. The control device includes a switching control unit for executing switching control for starting power supply to the load device when electric energy generated by the solar power generation device is equal to or larger than a starting threshold value and stopping the power supply to the load device when the electric energy becomes equal to or smaller than a stopping threshold value, a number-of-times acquiring unit for acquiring the number of times of execution of the switching control, and a threshold setting unit for increasing or reducing at least one of the staring threshold value and the stopping threshold value based on whether the number of times of execution acquired by the number-of-times acquiring unit within a first predetermined period has reached a predetermined first upper limit number of times.

A series circuit includes a capacitor connected in series with output terminals of a power converter. The power converter provides an auxiliary voltage and a controller controls the auxiliary voltage according to a selected function, such that the series circuit behaves as a capacitor, an inductor, or an impedance, based on the selected function. The controller may sense a voltage across the capacitor and use the sensed voltage to control the auxiliary voltage according to the selected function. The series circuit may be connected in parallel with output terminals of an AC-DC converter, wherein the series circuit operates according to a selected mode to produce the auxiliary voltage, and the auxiliary voltage substantially cancels a low frequency AC voltage ripple across the capacitor, such that a substantially pure DC output voltage is delivered to the load.

A power quality compensation system and a power quality compensation method are provided. The power quality compensation apparatus includes an input filter, a power electronic converter, a controller configured to control the power electronic converter, and a plurality of inductors connected to the power electronic converter. The power quality compensation method includes receiving signals from one or more sensors configured to detect voltage and current from an input side and an output side of the power quality compensation system, calculating reference signals, and using model predictive control to track the reference signals.

An industrial facility connected to a power grid includes a distribution grid connected with the power grid at a point of common coupling; at least one load connected via at least one power electronics block to the distribution grid, each power electronics block adapted for converting a current from the distribution grid into a current supplied to the respective load and each power electronics block including a load responder component adapted for determining a load demand of the respective load; at least one compensator connected to the distribution grid, each compensator being adapted for stabilizing a voltage and/or a frequency of a current in the distribution grid and each compensator including a compensator responder component adapted for receiving a stabilizing command and for applying the stabilizing command to the respective compensator; and a power controller in data communication with the one or more load responder components and the one or more compensator responder components, the power controller being adapted for receiving load demands(50) from the one or more load responder components, for determining stabilizing commands from the load demands and for sending the stabilizing commands to the one or more compensator responder components.

Embodiments herein provide a power control system (100) for controlling reactive power and/or active power in a power network. The power control system (100) is operatively coupled to the power network at a point of common coupling, PCC. The power control system (100) comprises a transformer (10) with at least three windings, in which a primary winding of the transformer (10) being connected to an input from the power network. The power control system (100) further comprises a voltage-source converter, VSC (20), being connected to a secondary winding of the transformer (10), wherein the VSC (20) is configured to work as a source or a sink of reactive power in the power network. The power control system (100) further comprises a Current Source Converter, CSC, (30) being connected to a tertiary winding of the transformer (10) and the CSC (30) is configured to handle power imbalance in the power network. Corresponding power compensator module is also disclosed.

Embodiments herein provide a power control system (100) for controlling reactive power and/or active power in a power network. The power control system (100) is operatively coupled to the power network at a point of common coupling, PCC. The power control system (100) comprises a transformer (10) with at least three windings, in which a primary winding of the transformer (10) being connected to an input from the power network. The power control system (100) further comprises a voltage-source converter, VSC (20), being connected to a secondary winding of the transformer (10), wherein the VSC (20) is configured to work as a source or a sink of reactive power in the power network. The power control system (100) further comprises a Current Source Converter, CSC, (30) being connected to a tertiary winding of the transformer (10) and the CSC (30) is configured to handle power imbalance in the power network. Corresponding power compensator module is also disclosed.