Abstract:
Embodiments of the present invention produce and define a relationship between local voltage and power measurements at a node of an electrical network and system conditions on a remote branch of the network. These local measurements are used to determine an optimal voltage set point at the node that, if realised by a reactive power resource, would affect the flow of reactive power or line current at one or more particular remote branches of the power system in a manner captured by the derived relationship. The change in reactive power required to obtain this voltage set point is also calculated based on local measurements.
Abstract:
Power generator control system and for controlling a marine vessel comprising a number of power generators (DG), each related to a generator protection unit (GP), wherein the system comprises means for monitoring the status of each generator and an evaluation unit (DWM) adapted to determine a dynamic window related to the permitted deviation within the operation of each generator as well as the total power plant, the evaluation unit being adapted to determining the control of said generators based on chosen parameters indicating the status of the generator system related to the window so as to allow deviations within said window at least partially defined by the total available power of the system being within chosen limits.
Abstract:
A method for compensating an inductance imbalance in a three-phase alternating current electrical system is provided. An inductance imbalance is determined in the three-phase electrical system, an induction compensation device is selected based on the determination and thereafter applied within the three-phase electrical system. The induction compensation device is applied onto a power cable within the electrical system. A three-phase electrical system wherein an inductance imbalance is addressed with an inductance compensation device is further provided.A wind turbine generator comprising such a three-phase AC electrical system.
Abstract:
The present invention discloses a coordinated control method for a distribution network with DER and EV and coordinated control system thereof. The method acquiring information from at least one DER controller, at least one EV controller and/or at least one load controller;calculating P/Q references and/or circuit breaker control commands for the DER, the EV and the load based on active/reactive power balance, voltage and/or frequency requirement;a!locating the references and/or the control commands to the DER, the EV and the load based on their locations and available capacity; and outputting the allocated references and/or control commands to the DER, the EV and the load. The solutions of the present invention minimize negative impacts from DER and EVs and maintain a controllable voltage and frequency stabilization.
Abstract:
A photovoltaic power plant with master-slave control architecture. The photovoltaic power plant includes slave plant controllers, with each s|ave plant controller controlling operation of photo voltaic inverters that convert direct current generated by solar cells to alternating current suitable for delivery to a utility power grid at a point of interconnection (POI). A master plant controller controls and coordinates the operation of the slave plant controllers. The master plant controller generates a global inverter real or reactive power setpoint, which is provided to each slave plant controller. In each slave plant controller, the global set point is processed to generate individual inverter real or reactive power setpoints that are provided to corresponding photovoltaic inverters controlled by that slave plant controller. A photovoltaic inverter generates an output based on received individual inverter setpoint to achieve a desired real power, voltage or power factor.
Abstract:
A power system is provided for delivering a custom level of electrical power to an industrial or commercial facility, comprising a local generator connected to a turbine operating in accordance with an organic Rankine cycle, the local generator having a capacity at least greater than a maximum anticipated power level needed for the electrical needs of a local industrial or commercial facility, one or more control devices operatively connected to the local generator for regulating active and reactive power generated by the generator, a detector for sensing active voltage induced by said generator, a detector for sensing reactive voltage produced by the generator, and a controller in electrical communication with said one or more control devices and with the active and reactive voltage detectors, wherein the controller directs the one or more control devices to regulate the generator such that the active power and reactive power generated by the generator are sufficient to satisfy active and reactive load conditions, of local industrial or commercial facilities. The present invention is also directed to a power system for providing a fast acting spinning reserve, comprising a turbine module of a organic Rankine cycle that is coupled to a generator, a main conduit through which motive fluid heated in said thermodynamic cycle is delivered to the turbine module, and a flow control component operatively connected to said main conduit for automatically limiting the flow of the motive fluid to the turbine module during base load conditions and for automatically increasing the flow of the motive fluid to the turbine module during variable load conditions.
Abstract:
Bei einem Verfahren zum Betrieb eines Kraftwerksfluktuierender elektrischer Leistungsfähigkeit, das neben mindestens einem Wirkleistung (P) und Blindleistung (Q) abgebenden spannungsstellenden Netzbildner(3) und mindestens einer Last (7) an ein begrenztes Wechselstromnetz (1) angeschlossen ist, wird in der PQ-Ebene ein gewünschter geschlossener Betriebsbereich des Netzbildners (3) definiert, in dem der Netzbildner auftretende Schwankungen einer Netzwechselspannung auf dem Wechselstromnetz (1) effizient auszuregeln vermag. Ein aktueller Betriebspunkt des Netzbildners in der PQ-Ebene wird ermittelt, und eine Abgabe von Wirkleistung und Blindleistung durch das Kraftwerks (8) wird so gesteuert, dass der Betriebspunkt des Netzbildners (3) in dem gewünschten Betriebsbereich gehalten wird.