Abstract: The present invention provides a photovoltaic power station remote monitoring system, comprising a monitoring center system and at least one monitoring terminal system; each monitoring terminal system is used for collecting operating parameters of a photovoltaic power station to which it belongs, and sending the operating parameters to the monitoring center system via a telecommunication network; the monitoring center system is used for receiving and displaying the operating parameters sent from respective monitoring terminal systems. For the monitoring personnel, a remote monitoring of respective PV power stations may be achieved only at the monitoring center system, which facilitates the monitoring.

Abstract: The present disclosure provides an electronic device protective case which is able to, by means of photovoltaic power generation, alleviate the insufficient capacity of a cell for an electronic device when it is used in the open air, and while an accumulator may be used as a power tank. A charging/discharging controller is used to control a photovoltaic cell panel in the protective case to store electric energy after the photovoltaic conversion in an accumulator, with the electric energy in the accumulator used to charge the electronic device. In addition, electrical connection states between an external data line port and the electronic device protective case as well as a port of an electronic device is controlled by means of a switch assembly, and when the switch assembly is in an ON state, the charging/discharging controller is used to control the accumulator or an external data line port to charge the electronic device.

Abstract: A method and an apparatus for controlling a Low Voltage Ride Through of a photovoltaic grid-connected inverter. The method for controlling comprises: judging whether a voltage value of a grid is smaller than an upper limit of a low voltage value and is not greater than a lower limit of the low voltage value; when it is judged that a root mean square value of the voltage in the grid is smaller than the upper limit of the low voltage value and greater than the lower limit of the low voltage value, controlling an active current value outputted from the inverter to be equal to a target active current value and controlling a reactive current value outputted to be equal to a target reactive current value, so that a comparison difference between a total current outputted by the inverter in a Low Voltage Ride Through state and a current outputted by the inverter in a normal state is smaller than a preset value.

Abstract: A maximum power point tracking method, device and a photovoltaic power generation system. The maximum power point tracking method involves sampling a present voltage and a present current of a photovoltaic array and obtaining a present power based on the present voltage and the present current. The maximum power point tracking using a difference between the present power and a power for a previous sampling time as a present perturbation power, and based on a ratio of the present perturbation power to a perturbation power for a previous sampling time obtain a gradient perturbation voltage step ratio. Further, the maximum power point tracking obtains a perturbation voltage step based on the gradient perturbation voltage step ratio and the voltage difference between the present voltage and the voltage for the previous sampling time, and control an output voltage based on the perturbation voltage step.

Abstract: The present disclosure provides an electronic device protective case[.] which is able to, by means of photovoltaic power generation, alleviate the insufficient capacity of a cell for an electronic device when it is used in the open air, and while an accumulator may be used as a power tank. A charging/discharging controller is used to control a photovoltaic cell panel in the protective case to store electric energy after the photovoltaic conversion in an accumulator, with the electric energy in the accumulator used to charge the electronic device. In addition, electrical connection states between an external data line port and the electronic device protective case as well as a port of an electronic device is controlled by means of a switch assembly, and when the switch assembly is in an ON state, the charging/discharging controller is used to control the accumulator or an external data line port to charge the electronic device.

Abstract: The present invention provides a maximum power point tracking method and device and a photovoltaic power generation system. The maximum power point tracking method comprises: sampling present voltage and present current of a photovoltaic array; obtaining present power based on the present voltage and the present current; using difference between the present power and power for previous sampling time as present perturbation power, and based on ratio of the present perturbation power to perturbation power for previous sampling time, obtaining gradient perturbation voltage step ratio; obtaining perturbation voltage step based on the gradient perturbation voltage step ratio and voltage difference between the present voltage and the voltage for previous sampling time; and controlling output voltage based on the perturbation voltage step.

Abstract: A PV junction unit for joining a plurality of PV strings into a single string, comprising: a plurality of anode branch circuits; an anode busbar adapted to connect with an anode output end of each PV string via one corresponding anode branch circuit; a plurality of cathode branch circuits; a cathode busbar adapted to connect with a cathode output end of each PV string via one corresponding cathode branch circuit; resistors each of which is connected in series in one corresponding anode branch circuit connecting the anode output end of one corresponding PV string with the anode busbar, wherein each resistor has a theoretical resistance; voltage measuring devices each of which is connected in parallel with one corresponding resistor; and a processor connected with each of the voltage measuring devices, the processor configured to determine a current value in one PV string at least based on the theoretical resistance of the resistor in one anode branch circuit connected with the one PV string and based on a volt

Abstract: The present disclosure provides a failure detection method for an inverter, which comprises steps of: performing Fourier transformation on output voltage signals of an inverter to obtain voltage harmonic signals; classifying the Fourier-transformed voltage harmonic signals; and determining a failure type corresponding to the Fourier-transformed voltage harmonic signals. Correspondingly, the present disclosure further provides a failure detection device for an inverter.

Abstract: A method and an apparatus for controlling a Low Voltage Ride Through of a photovoltaic grid-connected inverter. The method for controlling comprises: judging whether a voltage value of a grid is smaller than an upper limit of a low voltage value and is not greater than a lower limit of the low voltage value; when it is judged that a root mean square value of the voltage in the grid is smaller than the upper limit of the low voltage value and greater than the lower limit of the low voltage value, controlling an active current value outputted from the inverter to be equal to a target active current value and controlling a reactive current value outputted to be equal to a target reactive current value, so that a comparison difference between a total current outputted by the inverter in a Low Voltage Ride Through state and a current outputted by the inverter in a normal state is smaller than a preset value.

Abstract: An inverter and a grid-connected power generation system are provided to efficiently reduce the electric energy loss due to a DC boosted circuit, improve the efficiency of a PV system, and increase lifetime of the inverter. The inverter comprises: a DC boosted circuit; an inversion circuit connected to a output end of the DC boosted circuit; and a bypass circuit, of which an input end is connected to a positive electrode input end of the DC boosted circuit, and an output end is connected to a positive electrode output end of the DC boosted circuit.

Abstract: An authoring tool for creating an electronic document, a method for creating the electronic document, a data storage medium for instructing a computer to execute the method for creating the electronic document and a data storage medium for instructing a computer to display the electronic document.

Abstract: A defect detection system for thermally imaging a structure that has been energized by sound energy. The system includes a transducer that couples a sound signal into the structure, where the sound signal induces acoustic chaos in the structure that causes defects in the structure to heat up. In one embodiment, the transducer is a broadband transducer. A thermal imaging camera images the structure when it is heated by the sound signal.

Abstract: A defect detection system for thermally imaging a structure that has been energized by sound energy. The system includes a transducer that couples a sound signal into the structure, where the sound signal induces acoustic chaos in the structure that causes defects in the structure to heat up. In one embodiment, the transducer is a broadband transducer. A thermal imaging camera images the structure when it is heated by the sound signal.

Abstract: A hand-held sound source for use in an infrared or thermal imaging system that detects sub-surface defects in a structure. The sound source includes a transducer that is positioned against the structure to emit a sound signal into the structure. The sound source further includes an adjustable spring that pushes the transducer against the structure with a predetermined amount of force so that the sound energy is effectively coupled into the structure. The sound source also includes three stabilizing legs that stabilize the transducer on the structure. The length of each leg can be adjustable relative to the length of the other legs so that the sound source can be used against irregular surfaces.

Abstract: A defect detection system for thermally imaging a structure that has been energized by a sound energy. The system includes a transducer that couples a sound signal into the structure, where the sound signal causes defects in the structure to heat up. In one embodiment, a non-linear coupling material is positioned between the transducer and the structure to couple the sound energy from the transducer to the structure. A predetermined force is applied to the transducer and a pulse duration and a pulse frequency of the sound signal are selected so that the sound energy induces acoustic chaos in the structure, thus generating increased thermal energy. A thermal imaging camera images the structure when it is heated by the sound signal.

Abstract: A defect detection system for thermally imaging a structure that has been energized by sound energy. The system includes a transducer that couples a sound signal into the structure, where the sound signal causes defects in the structure to heat up. In one embodiment, a hard metal disk is positioned between the transducer and the structure to help couple the sound energy from the transducer into the structure. A predetermined force is applied to the transducer and a pulse duration and a pulse frequency of the sound signal are selected so that the sound energy induces acoustic chaos in the structure, thus generating increased thermal energy. A thermal imaging camera images the structure when it is heated by the sound signal.

Abstract: A hand-held sound source for use in an infrared or thermal imaging system that detects sub-surface defects in a structure. The sound source includes a transducer that is positioned against the structure to emit a sound signal into the structure. The sound source further includes an adjustable spring that pushes the transducer against the structure with a predetermined amount of force so that the sound energy is effectively coupled into the structure. The sound source also includes three stabilizing legs that stabilize the transducer on the structure. The length of each leg can be adjustable relative to the length of the other legs so that the sound source can be used against irregular surfaces.

Abstract: A thermal imaging system for detecting cracks and defects in a structure. An ultrasonic transducer is coupled to the structure through a malleable coupler. Ultrasonic energy from the transducer causes the defects to heat up, which is detected by a thermal camera. A control unit is employed to provide timing and control for the operation of the ultrasonic transducer and the camera.

Abstract: A defect detection system for thermally imaging a structure that has been energized by a sound energy. The system includes a transducer that couples a sound signal into the structure, where the sound signal causes defects in the structure to heat up. In one embodiment, the sound signal has one or more frequencies that are at or near an eigen-mode of the structure. In another embodiment, an on-linear coupling material is positioned between the transducer and the structure to couple the sound energy from the transducer to the structure. A predetermined force is applied to the transducer and a pulse duration and a pulse frequency of the sound signal are selected so that the sound energy induces acoustic chaos in the structure, thus generating increased thermal energy. A thermal imaging camera images the structure when it is heated by the sound signal.

Abstract: A thermal imaging system for detecting cracks and defects in a structure. An ultrasonic transducer is coupled to the structure through a malleable coupler. Ultrasonic energy from the transducer causes the defects to heat up, which is detected by a thermal camera. A control unit is employed to provide timing and control for the operation of the ultrasonic transducer and the camera.