4 results about "Phase jump" patented technology

The present invention relates a method for controlling a power generating unit connected to an electrical grid, during a fault ride through event, wherein the fault ride through event causes a phase jump in the electrical grid, the method comprises the steps of: measuring a voltage signal of the power generation unit, calculating a phase angle, based on the measured voltage, in a phase look loop (PLL) block, comparing the phase angle with previous measured phase angle, and calculate a phase angle change, detecting if the phase angle change larger than a threshold and changing to an another state by a Fault Ride Through State machine (FRTSM) for which the power generation unit shall operate, after the threshold has been exceeded.

This invention relates to the field of power electronic equipment control technology and discloses a method, apparatus, storage medium, and computer equipment for phase jump fault ride-through. The method includes calculating the power angle difference between the system power angle and the rated power angle of the target grid-type inverter and comparing it with a difference threshold; when a phase jump fault occurs, determining the corresponding power angle compensation value based on the rated power angle and the fault power angle under fault conditions; freezing the active power loop of the target grid-type inverter and applying the power angle compensation value to the output side of the active power loop; and when a current instantaneous value is detected to exceed a preset current threshold, limiting the reference current of the current inner loop of the target grid-type inverter. This method introduces power angle-based adaptive compensation and current limiting into the control loop, has a simple structure, requires no complex parameters, effectively addresses overcurrent and instability problems caused by phase jump faults, and improves system transient stability and fault ride-through capability.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a first phase change estimation reference signal during a first slot before a phase jump boundary and a second phase change estimation reference signal, a demodulation reference signal (DMRS), or both during the first slot after the phase jump boundary. In some examples, a sequence for the first phase change estimation reference signal, the second phase change estimation reference signal, the DMRS, or any combination thereof may be common to a group of UEs. The UE may perform a phase jump estimation based on decoding the first phase change estimation signal according to the common sequence and decoding at least one of the second phase change estimation signal or the DMRS according to the common sequence, and the UE may receive signaling during a second slot based on performing the phase jump estimation.

The application provides a fast phase unwrapping method based on tail non-convex regularization, and aims at solving the following two technical problems of the existing phase unwrapping algorithm: one is that details are lost due to the discontinuity of the image edge; and the other is that it is difficult to accurately realize phase unwrapping when facing high complexity or large phase jumps. The steps of the application are as follows: based on the wrapped image, a non-convex tail optimization model with box constraint is constructed; the non-convex tail optimization model is solved by using a completely split primal-dual algorithm under the condition that the support set is empty, so that an initial phase is obtained; errors in the initial phase estimation are corrected through tail minimization, and the support set is dynamically updated, so that an unwrapped image is obtained. Compared with the traditional phase unwrapping algorithm, the application combines the non-convex regularization with the tail minimization strategy, so that the accuracy and robustness of the phase unwrapping are improved, and the application has significant superiority in key evaluation indexes such as signal-to-noise ratio and structural similarity.