摘要:
A system (100) for controlling voltage on a distribution feeder (106) includes a plurality of capacitor banks (102a-102n) that can be connected to or disconnected from the distribution feeder. A first bank is configured to connect to the distribution feeder when a first voltage is below a first lower threshold value and to connect to the distribution feeder when the first voltage is above a first upper threshold value. The first upper threshold and first lower threshold are determined based off an operational set point. The system further includes a sensor (109) configured to measure the first voltage and a controller (108) in operable communication with the plurality of capacitor banks configured to determine the operational state of the first and second capacitor banks and, based on the first voltage, send a first instruction to the first capacitor bank, the first instruction causing the capacitor bank to vary the operational set point.
摘要:
Systems and methods for switch-controlled VAR sources coupled to a power grid are described. In some embodiments, a system comprises a distribution power network coupled to a first switch-controlled VAR source. The first switch-controlled VAR source may comprise a processor, a voltage compensation component, and a switch. The first switch-controlled VAR source may be configured to obtain a first delay value, monitor a first proximate voltage, initiate a first delay duration based on the comparison of the first proximate voltage to at least one set point, the first delay duration being based on the first delay value, determine, with the processor, after the first delay duration, whether to connect the voltage compensation component based on the monitored voltage, and control, based on the determination, the switch to connect the voltage compensation component to adjust a network voltage or a network voltage component.
摘要:
A power plant for providing electric power to a power grid includes energy sources; power conditioning units and a controller configured to cause power provided to the grid to have selected electrical characteristics. The controller is in high speed real-time communication with the power conditioning units and programmed to provide instructions to the power conditioning units.
摘要:
It is described a method for determining a voltage bounding range (125) defining a range of a wind turbine reference voltage (123) for a wind turbine (101) for controlling an output voltage (Vturb) of the wind turbine at a wind turbine output terminal (113), the method comprising: obtaining information regarding an electrical characteristic of a transmission line (106) connecting the wind turbine output terminal (113) to a point of common coupling (111) to which plural other wind turbines are connectable; and defining the voltage bounding range (125) based on the electrical characteristic of the transmission line (106).
摘要:
A method of controlling the dynamic power factor or the re-active power output of a wind park to a utility grid which is to be driven with a requested power factor, a requested voltage or a requested reactive power is provided. The wind park comprises reactor means (83) for providing a selectable shunt capacitance in accordance with a capacitor selection signal and is executed by a wind park controller (43). The method includes: a) determining a set point for the wind turbines (1, 3) for setting a reactive power output of the wind turbines (1, 3); b) transmitting the set point to the wind turbines (1, 3); c) comparing the determined set point to a first threshold set point; and d) adjusting the capacitor selection signal in accordance with a result of the comparison.
摘要:
There is provided a field device activated by a battery and housed in a pressure-resistant and explosion-proof container. The device includes: an external interface unit comprising: an infrared communication unit configured to communicate with an external infrared communication device through a window attached to the container; and a display unit configured to display status information about the field device; and a power controller configured to determine whether power from the battery should be switched on or off, in response to a request from the external interface unit.
摘要:
The invention concerns a method for operating a wind farm, the wind farm comprising a wind turbine, and an energy storage device, the wind farm being connected to an external grid, the method comprising determining a demanded active power, determining a demanded reactive power, determining power production of the wind turbine, and charging the energy storage device, when the power production is above the demanded active power, the demanded reactive power, or the vector sum of demanded active power and demanded reactive power. Furthermore, corresponding wind farm controllers, wind farms, program elements, and computer readable media are subject of the current invention.
摘要:
A system (100) for controlling voltage on a distribution feeder (106) includes a plurality of capacitor banks (102a-102n) that can be connected to or disconnected from the distribution feeder. A first bank is configured to connect to the distribution feeder when a first voltage is below a first lower threshold value and to connect to the distribution feeder when the first voltage is above a first upper threshold value. The first upper threshold and first lower threshold are determined based off an operational set point. The system further includes a sensor (109) configured to measure the first voltage and a controller (108) in operable communication with the plurality of capacitor banks configured to determine the operational state of the first and second capacitor banks and, based on the first voltage, send a first instruction to the first capacitor bank, the first instruction causing the capacitor bank to vary the operational set point.
摘要:
A method (50) of operating a tap changer of a transformer or a voltage regulator in a power grid includes obtaining (52) a load forecast for a time period. An average voltage profile is determined (54) for the time period based on the load forecast. The method further includes estimating (56) tap positions of the tap changer for leveling the average voltage profile during the time period. Switching signal commands are provided (60) to the tap changer based on the estimated tap positions.