Abstract:
The present invention relates to a method for operating a wind power plant which supplies power to a utility grid in accordance with an active power reference, the wind power plant comprises a plurality of wind turbine generators and a power plant controller arranged to send an active power set point to the wind turbine controller of each of the plurality of wind turbine generators, the method comprises the steps of: operating the wind power plant with an active power reference lower than a nominal active power of the wind power plant by curtailing at least some of the wind turbine generators of the plurality of wind turbine generators, determine a power capability of each of the curtailed wind turbine generators, defining a first group comprising wind turbine generators having a power capability higher than a power capability limit, defining a second group comprising wind turbine generators having a power capability lower than a power capability limit, equalize curtailment of the curtailed wind turbines generators by decreasing the active power set- point for the wind turbines generators in the first group and increasing the active power set-point for the wind turbines generators in the second group. The invention also relates to a wind power plant according to the method.
Abstract:
The present invention relates to a wind power plant having a plurality of wind turbine generators and a power plant controller arranged to communicate with the plurality of wind turbines generators, wherein each wind turbine generator in the plurality of wind turbine generators being related to a wind turbine controller, the wind turbine controller being arranged to control an active power output in its related wind turbine generator according to an active power set point received from the wind power plant controller;the wind power plant supplies power to a utility grid in accordance with an active power reference; such that upon a change in the active power reference the active power set point for each wind turbine generator is changed by a weighting factor; wherein the weighting factor for an increase of the active power reference depends on a relationship between an available active power of each wind turbine generator and an available active power of the wind power plant, and wherein the weighting factor for a decrease of the active power reference depends on a relationship between a produced active power of each wind turbine generator and an aggregated active power output of the wind power plant. The invention also relates to a method for control wind power plant.
Abstract:
The invention relates to a method for controlling power generation from a power plant which comprises power generating units such as wind turbine generators. The power generating units are controllable to produce power dependent on individual power set-points. The method comprises steps of obtaining desired 5 target power set-points for one or more prioritized power generating units, determining final target power set-points for the one or more prioritized power generating units based on the target power set-points and an available power adjustment margin of the power plant which is available for adjustment of the power set-points of the one or more prioritized power generating units, and 10 dispatching the final target power set-points to the prioritized power generating units.
Abstract:
The invention relates to a hybrid power plant (100) for producing power to the electrical grid, the hybrid power plant comprising a plurality of energy assets; a first renewable power generating unit, such as wind turbine generators (WTG1, WTG2), a second renewable power generating unit, such as a plurality of solar power units (PV1, PV2), and an energy storage unit, such as a battery energy storage system (BES). A power plant controller (PPC, 200) is arranged to perform a first comparison (C1) of an active power reference (P_REF,ext, Prefhpp) with an available power (PavailPGS) from the first and the second renewable power generating units and performing a second comparison (C2) of available charging, or discharging, capability of the energy storage unit with said first comparison. In response to this first comparison, there are distributed set points (PrefPGS) to the first and the second renewable power generating units so as to deliver power from the hybrid power plant in accordance with the received active power reference (P_REF,ext, Prefhpp).
Abstract:
The invention relates to a method for providing power ramp rate (RR) control of a hybrid power plant (100) with a plurality of energy assets (EA1, EA2, EA3) including wind turbine generators (WTG1, WTG2, WTG3) and possibly solar power units (PV1, PV2, PV3, 102), and an energy storage unit (ESU). Each energy asset has a ramp rate capability (RRC_i) defined as the highest possible ramp rate at a given time, and the method includes receiving from each energy asset the corresponding ramp rate capability, and taking into account the plurality of ramp rate capabilities from the energy assets when calculating the power setpoint (Pset_i) to each energy asset, so as to improve the power ramp rate (RR) control of the hybrid power plant (100).
Abstract:
The invention relates to a method for controlling a power plant (100) for providing frequency support to a power grid. The power plant comprises an electrical storage unit (150) and a power generating system (110) comprising one or more power generating units (101) including at least one wind turbine generator (102). The method comprises setting a frequency control period, wherein the electrical storage unit is scheduled to charge or discharge according to a first power set-point and at the start of the frequency control period, charging or discharging the electrical storage unit according to the power set-point. In case of a frequency deviation, a power change of the power from the electrical storage unit is determined based on the frequency deviation. Frequency support is provided by controlling the electrical storage unit to charge or discharge according to a second power set-point determined from the power change.
Abstract:
The invention relates to a method for controlling power generation from a power plant (100) which comprises a plurality of power generating units. The method involves setting a maximal allowed power production (Pmax) for each power generating unit in a selection of one or more power generating units of second priority (pl2) to a non-zero value, where the maximal allowed power production (Pmax) is determined dependent on whether a first power production gap (Pgap1) is greater or less than zero and dependent on a comparison of the first power production gap (Pgap1) with a second available power production capability (Paval_pl2) of the selection of the one or more power generating units of the second priority (pl2).
Abstract:
The invention relates to a hybrid power plant (100) for producing power to the electrical grid, the hybrid power plant comprising a plurality of energy assets; a first renewable power generating unit, such as wind turbine generators (WTG1, WTG2), and an energy storage unit (EA3, ESU), preferably a battery energy storage system (BES). The hybrid power plant has a power plant controller (PPC, 200) arranged to communicate with the plurality of energy assets, and, when an under-frequency event occurs, the energy storage unit (ESU, BES) provides frequency support during the under-frequency event (UFE) by providing additional power (ΔP) as a function of a state of charge (SoC) of the energy storage unit at the time when the under-frequency event occurs (SoC_mem). Thus, during an under-frequency event, it is possible to obtain a more stable power output from the hybrid power plant.