Abstract: A model prediction-based control method for grid forming of multi-port autonomous reconfigurable solar plants includes: estimating and predicting system parameters by establishing a multi-port autonomous reconfigurable solar plant and a dynamic model of a synchronous generator model; converting an objective function into an unconstrained optimization problem, using Newton's method to achieve minimum computational burden within each calculation time step to find a solution in real time for obtaining an optimal angular frequency; based on results of the optimal angular frequency, updating an output voltage and a dq-axis current of the multi-port autonomous reconfigurable solar plant, and changing an arm modulation index of the plant, thereby realizing the plant's inertia and primary frequency modulation support. The model prediction-based control method provided by the present invention achieves rapid prediction during operation and improves frequency response, rapidity and system stability.

Abstract: The invention discloses a control method and system for improving a transient stability area of a grid-connected inverter. It includes performing park coordinate transformation on a three-phase voltage and a three-phase output current of a connection point of a grid-connected inverter to obtain an actual voltage input value and an actual current input value required for current control; obtaining the grid-connected voltage phase through phase-locked loop processing; generating, by the power control module, the current command value required by the current control module; using the sliding mode current control method, by the current control module, to generate a dq voltage signal, and obtaining PWM modulated voltage control signals through inverse park transformation; using a LCL filter to filter out high-order harmonics to achieve grid-connected control.

Abstract: Disclosed are a method and system for testing high-voltage ride-through of a photovoltaic inverter. The method for testing high-voltage ride-through of a photovoltaic inverter includes: connecting a board-to-board (BTB) circuit to a passive circuit in series, and connecting circuit breakers to the passive circuit to form an inverter test device; connecting one end of the inverter test device to an alternating current power supply, and connecting the other end of the inverter test device to a tested apparatus; and performing testing by adjusting a parameter of the passive circuit and a switching mode of the circuit breakers by means of the BTB circuit. According to the present disclosure, an influence of the device for testing high-voltage ride-through of a photovoltaic inverter on power supply voltage is eliminated, a requirement on supply of reactive power of the power supply is eliminated, applicability is better, and cost is lower.

Abstract: A building roof photovoltaic power quality evaluation method based on AHP and CRITIC-Entropy is provided. The method includes: obtaining data values of evaluation indicators of a building roof photovoltaic power quality, and constructing a judgment matrix and a probability matrix according to the data values of the evaluation indicators; processing the judgment matrix to obtain a subjective corresponding weight of each of the evaluation indicators by using an improved AHP method, and solving the probability matrix to obtain an objective corresponding weight of each of the evaluation indicators based on the CRITIC-Entropy; and integrating the subjective corresponding weights and the objective corresponding weights to obtain comprehensive weight coefficients, and determining a final evaluation result by the comprehensive weight coefficients and the probability matrix.

Abstract: A building photovoltaic data interpolation method based on WGAN and whale optimization algorithm is provided, which includes: obtaining historical building roof photovoltaic output data, perform preprocessing on the historical building roof photovoltaic output data, and uses CNN to build a GAN; describing missing value position of preprocessed data by using a binary mask matrix, and setting Wasserstein distance to define a loss function of a GAN generator and a discriminator; taking the loss function as a fitness function, optimizing an input to the GAN generator through a whale optimization algorithm and obtaining optimized candidate samples; fusing the optimized candidate samples and a photovoltaic data processed by the binary mask matrix to obtain completed reconstructed samples, so as to improve the complementary accuracy, optimize the random noise, remove the unfavorable influencing components, and provide services for building rooftop PV data interpolation more accurately.

Abstract: A foldable adjustable photovoltaic module, comprising angle adjusting device, comprising adjusting component and basic photovoltaic panel on the adjusting component; and folding device, comprising first and second folding components, is provided. One end of the basic photovoltaic panel is installed with protective photovoltaic panel, and the first folding component is between the basic and the protective photovoltaic panels. Both sides of the basic and the protective photovoltaic panels are provided with side photovoltaic panels, and the second folding component connects the side photovoltaic panels, the basic photovoltaic panel and the protective photovoltaic panel. The module can control multiple photovoltaic panels for angle adjustment, so as to conveniently obtain the optimal illumination angle.

Abstract: An antenna tuning circuit is disclosed. The antenna tuning circuit is configured to make multiple estimates on an antenna impedance at an antenna port and determine an optimum tuning state for antenna tuning based on the antenna impedance estimates. The antenna tuning circuit may be further configured according to various embodiments of the present disclosure to minimize impedance estimation error, reduce magnitude and/or phase disturbance during antenna tuning, and extrapolate antenna impedance estimates for both transmit and receive frequencies. As a result, the antenna tuning circuit can accomplish autonomous antenna tuning optimization to thereby improve transmit and receive performance in a wireless communication device.

Abstract: The present disclosure generally relates to the combination of MEMS intrinsic technology with specifically designed solid state ESD protection circuits in state of the art solid state technology for RF applications. Using ESD protection in MEMS devices has some level of complexity in the integration which can be seen by some as a disadvantage. However, the net benefits in the level of overall performance for insertion loss, isolation and linearity outweighs the disadvantages.

Abstract: The present disclosure generally relates to any device capable of wireless communication, such as a mobile telephone or wearable device, having one or more antennas. After measuring reflection coefficients of a device at three different DVC states, the reflection coefficient for all other DVC states can be calculated. Thus, based solely upon three reflection coefficient measurements, the antenna can be tuned to adjust for any changes in impedance at the antenna.

Abstract: The present disclosure generally relates to any device capable of wireless communication, such as a mobile telephone or wearable device, having one or more antennas. After measuring reflection coefficients of a device at three different DVC states, the reflection coefficient for all other DVC states can be calculated. Thus, based solely upon three reflection coefficient measurements, the antenna can be tuned to adjust for any changes in impedance at the antenna.

Abstract: The present disclosure generally relates to any device capable of wireless communication, such as a mobile telephone or wearable device, having one or more antennas. By applying a variable reactance (capacitive or inductive component) antenna aperture tuner within a simple, scalar antenna aperture tuning system, the maintenance of a constant antenna resonant frequency in the presence of environmental changes or head/hand effects is obtained. The variable reactance is used to adjust the resonant frequency of the antenna to stay at the desired target frequency in response to external variables that would otherwise shift the resonance away from the operating frequency of the device. Adjusting the resonant frequency of the antenna in response to externally induced changes maintains the radiating efficiency of the antenna and simultaneously avoids impedance mismatch between the antenna and the respective transmit/receive path in the radio, thereby minimizing transmission losses.

Abstract: The present disclosure generally relates to the combination of MEMS intrinsic technology with specifically designed solid state ESD protection circuits in state of the art solid state technology for RF applications. Using ESD protection in MEMS devices has some level of complexity in the integration which can be seen by some as a disadvantage. However, the net benefits in the level of overall performance for insertion loss, isolation and linearity outweighs the disadvantages.

Abstract: The present disclosure generally relates to any device capable of wireless communication, such as a mobile telephone or wearable device, having one or more antennas. By applying a variable reactance (capacitive or inductive component) antenna aperture tuner within a simple, scalar antenna aperture tuning system, the maintenance of a constant antenna resonant frequency in the presence of environmental changes or head/hand effects is obtained. The variable reactance is used to adjust the resonant frequency of the antenna to stay at the desired target frequency in response to external variables that would otherwise shift the resonance away from the operating frequency of the device. Adjusting the resonant frequency of the antenna in response to externally induced changes maintains the radiating efficiency of the antenna and simultaneously avoids impedance mismatch between the antenna and the respective transmit/receive path in the radio, thereby minimizing transmission losses.