A system and associated method models behavior of an unbalanced distribution system using a current-voltage (IVACOPF) formulation. Untransposed distribution lines, shunt elements of distribution lines, and detailed representation of distribution transformers and DERs are modeled. The system…
A grid-tied power supply system includes a controller and at least two inverters. One inverter is coupled to a plurality of power supply modules. The controller is configured to determine a power parameter. The inverter receives a power control packet through a communication transmission medium…
A method for solving multiple OPF equations of an AC electrical power system with plural topologies and admittances is provided. The method includes determining a continuous admittance space to embed the plural topologies, determining a plurality of voltage magnitudes and a plurality of voltage…
A zero-sequence current balancer for a controlling zero-sequence current in a three- phase power system includes a cascade multilevel modular inverter (CMMI) coupled to the three-phase power system, wherein the CMMI has a plurality of modules, each module having a module capacitor, and a real power…
A method for controlling a converter supplying a load is described. The converter is connected to an alternating current (AC) grid supplied by at least one renewable energy source. The method comprises receiving a measured AC grid voltage measured in the AC grid and a measured load voltage measured…
The power conversion system includes a power conversion circuit, a power conversion control circuit including a charging control mode, and a command value generating part. The charging control mode is a mode in which the output voltage of the power conversion circuit is controlled so that an…
The present invention relates to a device for controlling a power generation unit and/or electricity storage center and connection terminal intended to be connected to a microgrid, comprising a control automaton (100), configured to calculate a reference voltage Uref(i) for each unit, measurement…
A method for solving multiple OPF equations of an AC electrical power system with plural topologies and admittances is provided. The method includes determining a continuous admittance space to embed the plural topologies, determining a plurality of voltage magnitudes and a plurality of voltage…
A power supply system and a grid connection control method. The power supply system includes a power supply, an inverter, a transformer, a power station collection module, and an inverter collection control circuit. The inverter collection control circuit is configured to obtain an amplitude value…
A power flow control module adjusts a voltage or current in a line of an electrical network. The module includes: two module connections connecting to the line, switching elements, an energy storage, and two energy connections connecting to an energy source. The two module connections electrically…
Disclosed are a coordinated control method and system for active support of a new energy power station containing a voltage-controlled source. The method includes: obtaining a working mode and a controlled target value of an external characteristic of a new energy power station, and setting…
A power conversion device is provided and connects a distributed power source to an electric power system connected to an infinite bus power system by converting electrical power of the distributed power source into alternating current power corresponding to the electric power system and by…
Disclosed is a DC power supply device that includes: a transformer having a primary side and a secondary side; a diode rectifier connected at its input side to the secondary side of the transformer; an inverter connected at its output side to the secondary side of the transformer; and a controller…
A power conversion device inputs or outputs a power for changing a state quantity of a distribution grid to which a voltage source device is connected, to or from the distribution grid. A grid control unit calculates a power command value of the power conversion device such that a drooping…
Techniques to limit electrical power when forming an electrical grid using an active front end unit having an inverter that is coupled to a capacitor (and inductor) that is coupled to an electrical grid. For example, to limit power, the integration of a commanded frequency of the system can be…
A hierarchical approach is provided to integrate functions and components into the various systems and subsystems within a distribution network, including standardization of modular and scalable power electronics power blocks with embedded diagnostics and prognostics.
A power conversion device is connected to a power transmission line which is connected to a generator. The power conversion device includes a frequency detector that detects a system frequency, the system frequency being a frequency of an AC voltage on the power transmission line, a controller that…
The invention discloses a multi-port flexible AC interconnection device with active power flow control capability for an AC power grid, including a static synchronous compensator and a multi-port flexible interconnection module connected in series. The multi-port flexible interconnection module…
Systems connected to an electrical grid for delivering electrical power thereto and methods of controlling such systems are provided. The electrical system includes a plurality of power generators. A system-level controller receives a demand signal from the electrical grid. The system-level…
A method of controlling an electricity distribution network, wherein the electricity distribution network is a mesh network including a plurality of loads and there is a voltage-source converter connected to a point in the network. The method comprises, while using the voltage-source converter to…
A grid side inverter system includes a grid side inverter, a phase locked loop controller arranged to determine a phase of a dq-frame dependent on a monitored grid voltage vector in the dq-frame and a reference grid voltage vector in the dq-frame, a current reference decision unit arranged to…
A settlement device includes a measured value acquisition unit to acquire a measured value of active power transmitted or received at a connection point of a power transmission and distribution network and a regulating power providing means capable of providing regulating power to the power…
A method, apparatus, system and computer program is provided for optimizing and controlling volt-amperes reactive on an electrical control system. System-level and local-level measurements are determined and analyzed to prioritize and optimize which VAR adjusters are adjusted.
Disclosed is an electrical power system having a transmission system with a first voltage, a distribution network with a second voltage, and a coupling unit having a coupling ratio, and a distributed generation unit DGU to generate the electric power and be in a communication with the distribution…
A system and a method for locally controlling delivery of electrical power along the distribution feeder by measuring certain electricity parameters of a distribution feeder line using a substation phasor measurement unit (PMU) electrically coupled to a substation distribution bus at a first node…
A hierarchical approach is provided to integrate functions and components into the various systems and subsystems within a distribution network, including standardization of modular and scalable power electronics power blocks with embedded diagnostics and prognostics.
A power supply system, a converter, and a circulating current suppression method of the converter. The power supply system includes at least two converters that are coupled between a direct current power supply and an alternating current grid. Each converter obtains target output reactive power…
A power converter system including an input configured to receive input AC power from an input power source, the input power source having a peak voltage limit, at least one output configured to provide output power to at least one load, a charger coupled to the input and configured to convert the…
A method and system for controlling voltage and reactive power for electrical grids includes monitoring the output of the energy generation facilities at the point of interconnection (POI) of each energy generation facility to the power transmission system of the electrical grid. In addition, the…
A method and system for controlling voltage and reactive power for electrical grids includes monitoring the output of the energy generation facilities at the point of interconnection (POI) of each energy generation facility to the power transmission system of the electrical grid. In addition, the…