摘要:
When a switch of a load component is turned on, current flows from a rated AC power supply to a zerocross detection circuit. In the zerocross detection circuit, zerocross points of a waveform of current are detected and input to an output control circuit. The output control circuit selects in advance a sampling pattern and inputs a signal corresponding to this sampling pattern to an SSR by counting the zerocross points. In accordance with the sampling pattern, the SSR repeats a conductive state and a non-conductive state with a cycle of the waveform of current being one unit. In the conductive state, the current flows from the rated AC power supply to the load components. In this way, the average value of the current flowed to the load components is reduced at a predetermined rate with respect to entire output of the rated AC power supply.
摘要:
The present disclosure relates to a device of monitoring a reactive power compensation system to compensate reactive power, the device including a measurement unit configured to acquire voltage data, current data, and a phase angle from each constituent device, a power performance index calculation unit configured to calculate power performance index data including at least one of power factor data, flicker data, and harmonics data based on the acquired voltage data, current data, and phase angle, and a controller configured to analyze and evaluate the calculated power performance index data based on a preset situation.
摘要:
Compensateur (10) d'énergie réactive comprenant : - un bus (13) de tension continue d'entrée (V c ) propre à fournir de l'énergie réactive, - un onduleur (18) relié au bus de tension continue (13) et comportant des interrupteurs électroniques commandables (34) propres à convertir la tension continue d'entrée (V c ) en un tension alternative intermédiaire, - un dispositif (22) de commande des interrupteurs électroniques, - des moyens de régulation (22) pour déterminer une valeur de courant actif cible circulant entre l'onduleur et le réseau propre à réguler la tension courante continue d'entrée (V c ) par rapport à une valeur de référence fixée ;
le dispositif de commande des interrupteurs déterminant des signaux de commande en fonction de la valeur dudit courant actif cible déterminée à partir de l'erreur entre la valeur de référence et le carré de la tension continue du bus par l'intermédiaire d'une fonction de transfert dont la définition varie en fonction de la valeur courante de ladite tension continue.
摘要:
Devices and methods for identifying an electrical device, and its state, in a network of electrical devices are disclosed. An energy monitoring device is programmed to identify an electrical device coupled to a power supply, and a state of the electrical device, from a change in successive measurements of the power supply. Algorithms for determining a load signature for an electrical device and its state are disclosed. A stored table of load signatures for states is used to identify devices, and states. Energy monitoring information is collected and presented to the user on a display, a remote display, or is transmitted over a network to a remote device such as a personal computer, personal digital assistant, an iPhone, a cell phone, voice mail, email, or text message.
摘要:
Spannungsschwankungen in einem Versorgungsnetz (2) sollen effizient und kostengünstig reduziert werden. Dazu wird ein Verfahren vorgeschlagen, bei dem ein in eine Last fließender Strom gemessen wird (16), womit ein entsprechendes Strommesssignal erhalten wird. Die Spannungsschwankungen werden mit Hilfe eines TCR (8), der eine thyristorgesteuerte Reaktanz darstellt, und einem VSC (10), der einen spannungsgeführten Stromrichter darstellt, reduziert. Das Strommesssignal oder eine entsprechende Größe wird in Abhängigkeit von einem vorgegebenen absoluten Grenzwert in einen ersten Anteil und einen zweiten Anteil geteilt. Der TCR (8) wird anhand des ersten Anteils und der VSC (10) anhand des zweiten Anteils gesteuert. Alternativ kann der TCR mit dem Last-Strommesssignal und der VSC mit einer Summe aus dem Last-Strommesssignal und einem TCR-Strommesssignal gesteuert werden.
摘要:
Methods and apparatus for power factor correction include selectively coupling bit reactive loads with a load having dynamic reactive properties to dynamically correct a power factor. Methods and apparatus for reducing distortion in a power delivery system include a means for determining distortion in a power line, forming a corrective signal according to the distortion and selectively sinking and sourcing current to the power line according to the corrective signal.
摘要:
When a switch of a load component is turned on, current flows from a rated AC power supply to a zerocross detection circuit. In the zerocross detection circuit, zerocross points of a waveform of current are detected and input to an output control circuit. The output control circuit selects in advance a sampling pattern and inputs a signal corresponding to this sampling pattern to an SSR by counting the zerocross points. In accordance with the sampling pattern, the SSR repeats a conductive state and a non-conductive state with a cycle of the waveform of current being one unit. In the conductive state, the current flows from the rated AC power supply to the load components. In this way, the average value of the current flowed to the load components is reduced at a predetermined rate with respect to entire output of the rated AC power supply.
摘要:
Methods and apparatus for power factor correction include selectively coupling bit reactive loads with a load having dynamic reactive properties to dynamically correct a power factor. Methods and apparatus for reducing distortion in a power delivery system include a means for determining distortion in a power line, forming a corrective signal according to the distortion and selectively sinking and sourcing current to the power line according to the corrective signal.