Abstract: For systems subject to unbalanced faults, analytical model building for stability assessment is a challenging task. This application presents a straightforward modeling approach. A generalized dynamic circuit representation is achieved by use of the Laplace transform variables. The voltage and current relationship at the fault location is translated into the relationship of three subsystems. The final circuit model is an interconnected sequence network with impedances in the Laplace domain. This circuit can be directly converted from a steady-state sequence network.

Abstract: In some aspects, the techniques described herein relate to a method including: receiving a data stream from one or more power plants at the same location by a computing device; based on the received data stream, determining a grid impedance of the one or more power plants with respect to a grid by the computing device; based on the received data stream, determining power plant control parameters and communication delay for each of the one or more power plants; and modeling the integrated system consisting of the one or more power plants and the grid based on the determined grid impedance and the power plant control parameters by the computing device.

Abstract: An exemplary system and method are disclosed that employ dq admittance extraction or identification based on Gaussian time-domain pulse excitation. A narrow time-domain pulse has a wide frequency spectrum. Two or more narrow time-domain pulses can be injected, as simulated transients, into a utility infrastructure with one or multiple inverter-based resources to perturb the system with a wide frequency spectrum that overs the frequencies of interest.

Abstract: In certain examples, methods, apparatuses and semiconductor-related structures are directed to nighttime-like electrical power generation by use of a spectro-angular selective emitter as an optimal radiative cooler and a thermoelectric power generator (TEG) having a hot side and a cold side. The cold side may be coupled to the spectro-angular selective emitter which is directed to or facing an atmosphere characterized by an absence of solar light. Power may be generated via the TEG based on energy directed from the spectro-angular selective emitter and by controlling or limiting ability of the spectro-angular selective emitter to absorb heat power at frequencies and/or angles where emission of the atmosphere is dominant.

Abstract: A system and method for obtaining frequency-domain admittance/impedance using a few sets of time-series data. Utilizing an Eigensystem Realization Algorithm (ERA) or a dynamic mode decomposition (DMD), the input/output frequency-domain model reflecting voltage/current relationship is identified, and admittance/impedance identification is demonstrated for a grid-connected inverter-based resource (IBR) system. The proposed approach provides a powerful tool to replace the state-of-the-art harmonic injection methodology.

Abstract: Various examples are provided extended Kalman filtering estimators for generators. In one example, among others an extended Kalman filtering estimator includes a dynamics estimator configured to calculate an estimated variable such as an estimated dynamic state or an estimated parameter of a generator, a geometry estimator configured to estimate generator values, and a Kalman filter component configured to determine a correction to the estimated state variable.

Abstract: Devices and methods for mechanism-based feedback controller employed in a wind powered power system are provided. A controller can include a vector control-based voltage source converter with feedback control circuitry. The feedback control circuitry is configured to modulate either a power order or a dc-link voltage order to control coupling between voltage and power. The controller can be connected to a wind-based turbine generator of a wind farm and regulate power deployed to a power grid.

Abstract: Various examples are provided for feedback control of power systems. The feedback control can provide simultaneous frequency regulation and economic operation of a power system. In one example, a method includes obtaining a frequency difference associated with a generator of a power system; determining an output power adjustment based at least in part upon the frequency difference and a cost function associated with the generator; and providing a power command to a secondary frequency control of the generator, the power command based upon the output power adjustment. In another example, a generator control system includes a primary frequency controller configured to control frequency droop of a generator of a power system; and a secondary frequency controller configured to adjust output power of the generator based at least in part upon a frequency difference associated with the generator and a cost function associated with the generator.

Abstract: Disclosed are various embodiments that relate to multi-agent decision system based at least in part on a dual's dual problem formulation. The embodiments limited the amount of information exchanged among autonomous entities. The embodiments can incorporate existing AC optimal power flow (OPF) software systems. In one embodiments, a subgradient-based iterative method is used.

Abstract: The present disclosure provides a lighting-on device and a method for cell test. The lighting-on device includes a movable unit including a first marker; an image acquisition unit configured to acquire an image indicating an actual relative positional relationship between the first marker and a second marker on a display panel; a calculation unit configured to calculate the actual relative positional relationship between the first marker and the second marker according to the image; a first position adjustment unit configured to drive the movable unit so as to adjust the actual relative positional relationship; and a first control unit configured to determine whether the adjusted actual relative positional relationship has been aligned by the first position adjustment unit according to the relative positional relationship between the first marker and the second marker.

Abstract: Various examples are provided for parameter estimation of generators. In one example, among others, a method includes collecting data corresponding to a generator using a phasor management unit (PMU) and estimating dynamic parameters of the generator using extended Kalman filtering (EKF) and the collected PMU data. In another example, a system includes at least one application executable in a processing device that obtains operational data corresponding to a generator and estimates a dynamic parameter of the generator using EKF and the operational data. In another example, an EKF estimator includes a dynamics estimator configured to estimate a state variable of a generator, a geometry estimator configured to estimate phasor values associated with the generator, and a Kalman filter gain configured to determine a correction to the state variable.

Abstract: It relates to a lithium ion capacitor and a formation method thereof. A positive electrode of the capacitor comprises porous carbon and lithium-intercalated metal oxide, and a negative electrode thereof is carbon difficult to graphitize. The metal lithium electrode and a cell are arranged in a face-to-face manner and separated by separator. A current collector adopts a porous current collector. During formation, the lithium-intercalated oxide in the positive electrode is used as a lithium source to intercalate lithium into the negative electrode, and a third electrode lithium plate is used for supplementing lithium ions to the metal oxide in a lithium-deintercalated state of the positive electrode.

Abstract: Various examples are related to synchronous generator modeling with frequency control, which can be achieved using unscented Kalman filtering. In one example, a method includes obtaining operational parameters associated with a generator of a power system; determining parameters of a synchronous generator model with frequency control based at least in part upon the operational parameters associated with the generator; and providing a command to a frequency control of the generator, the command updating one or more parameters of the frequency control. In another example, a system includes a generator controller for a generator of a power system; and a computing device in communication with the generator controller, where the computing device is configured to determine parameters of the synchronous generator model using operational parameters associated with the generator and provide a command updating one or more parameters of a frequency control of the generator controller.

Abstract: The present disclosure provides a lighting-on device and a method for cell test. The lighting-on device includes a movable unit including a first marker; an image acquisition unit configured to acquire an image indicating an actual relative positional relationship between the first marker and a second marker on a display panel; a calculation unit configured to calculate the actual relative positional relationship between the first marker and the second marker according to the image; a first position adjustment unit configured to drive the movable unit so as to adjust the actual relative positional relationship; and a first control unit configured to determine whether the adjusted actual relative positional relationship has been aligned by the first position adjustment unit according to the relative positional relationship between the first marker and the second marker.

Abstract: The present invention provides a detection device for a cassette comprising at least one supporting unit, each supporting unit comprising a plurality of supporting brackets which constitute a supporting plane, wherein the detection device comprises a sensing mechanism for detecting whether position of each of the supporting brackets in each supporting unit is within a predetermined range. In the present invention, through detecting positions of the supporting brackets in the cassette, and then judging whether the positions of the supporting brackets in each supporting unit are in a preset range, a supporting unit in which there is one or more bracket supporting brackets whose positions are not in the preset range can be maintained in time, and therefore, damage to the glass substrate due to large error in positions of the supporting brackets can be prevented.

Abstract: Various examples are provided for feedback control of power systems. The feedback control can provide simultaneous frequency regulation and economic operation of a power system. In one example, a method includes obtaining a frequency difference associated with a generator of a power system; determining an output power adjustment based at least in part upon the frequency difference and a cost function associated with the generator; and providing a power command to a secondary frequency control of the generator, the power command based upon the output power adjustment. In another example, a generator control system includes a primary frequency controller configured to control frequency droop of a generator of a power system; and a secondary frequency controller configured to adjust output power of the generator based at least in part upon a frequency difference associated with the generator and a cost function associated with the generator.

Abstract: The present invention provides a detection device for a cassette comprising at least one supporting unit, each supporting unit comprising a plurality of supporting brackets which constitute a supporting plane, wherein the detection device comprises a sensing mechanism for detecting whether position of each of the supporting brackets in each supporting unit is within a predetermined range. In the present invention, through detecting positions of the supporting brackets in the cassette, and then judging whether the positions of the supporting brackets in each supporting unit are in a preset range, a supporting unit in which there is one or more bracket supporting brackets whose positions are not in the preset range can be maintained in time, and therefore, damage to the glass substrate due to large error in positions of the supporting brackets can be prevented.