1667 results about "Photovoltaic electricity" patented technology

A generating facility is provided for generating electricity from both solar and non-solar energy sources. The solar generating portion of the facility includes capability to directly generate electricity from solar insolation, or to store the solar energy in a tangible medium, including stored heat, or solar generating fuel. The generating facility is configured to generate electricity simultaneously from both solar and non-solar sources, as well a solely from immediate solar insolation and from solar energy stored in a tangible medium. Additionally, the solar generating capacity may be segregated; such that separate spectra of solar insolation are used to capture heat for steam turbine based electrical generation, capture light energy for photovoltaic based electrical generation, and to grow biomass to generate a solar fuel.

An object of the invention is to provide a solar cell ordering system for planning a photovoltaic power system, making a cost estimate thereof, and placing an order thereof. A solar cell ordering system (50) includes roof shape creating means (1) for creating roof shape data (32) based on inputted roof information (31), module layout means (2) for designing a layout of a solar cell module using the roof shape data (32), and drawing up a list (34) of members of necessity for the photovoltaic power system, estimate creating means (3) for drawing up estimate information (37) using the list (34) of members and unit price information (36), and order information processing means (4) for placing an order for the members using the estimate information (37) and order application information (38).

The present invention relates generally to the photovoltaic generation of electrical energy. The present invention relates more particularly to photovoltaic roofing products for use in photovoltaically generating electrical energy. One aspect of the invention is a photovoltaic roofing element including a roofing substrate; a photovoltaic element disposed on the roofing substrate; an electrical connector operatively connected to the photovoltaic element, the electrical connector having a top side, a down-roof side and an electrical terminus; and a shield disposed adjacent the electrical terminus of the electrical connector on its down-roof side, its top side, or both.

The present invention relates particularly to photovoltaic systems for use in photovoltaically generating electrical energy. One aspect of the invention is a photovoltaic roofing system including a plurality of photovoltaic elements contiguously disposed on a roof deck arranged in at least two horizontal rows, defining a photovoltaic area; a plurality of roofing elements disposed adjacent the contiguously-disposed photovoltaic elements, along their side edges; side flashing disposed along the side edges of the contiguously-disposed photovoltaic elements, the side flashing having a flange facing away from the photovoltaic area at least partially disposed between a roofing element and the roof deck, and a structure at least partially disposed on the surface of the photovoltaic element or at least partially disposed between a photovoltaic element and the roof deck.

The invention discloses a grid-connection control method for solar photovoltaic power generation and belongs to the field of solar photovoltaic power generation. The method is characterized in that: constant voltage control of a direct-current bus is taken as a basic starting point and the output voltage and current of a photovoltaic cell are adjusted by adjusting the pulse-width modulation (PWM) duty ratio of a DC/DC converter so as to realize the tracking control of the maximum output power point of the photovoltaic cell; and in addition, stable and grid-connection running of a photovoltaic generating system is realized and the constant voltage of the direct-current bus is maintained by adjusting the output current of a DC/AC grid-connected inverter. The tracking control of the maximum power point of the photovoltaic cell is characterized in that: the variation track of a power-voltage vector is obtained by sampling the output voltage and current of the photovoltaic cell at three or more points and is matched with a preset variation mode so as to determine the adjusting direction of the output current. During grid-connection running, the PWM duty ratio of the inverter is adjusted by using the measured voltage amplitude, phase position and frequency information of a power grid so as to synchronize the voltage generated by the system and the power grid. Moreover, the voltage of the direct-current bus is kept constant by using high-speed feedback of the output current of the inverter, so that the power of the system fed in the power grid is close to the power generated by a solar cell to the maximum.

The invention discloses an energy management and coordination control system and method for a wind and solar energy distributed power generation independent micro grid. The energy management and coordination control system is composed of a distributed power generation system, a wireless communication system and a monitoring system, and an AC and DC hybrid topology structure is adopted. Specifically, main power generation units are composed of the wind power generation unit, the photovoltaic power generation unit and other micro power supplies, an energy storage device is of a hybrid energy storage type including a lead-acid storage battery and a super capacitor, the micro wind power generation unit and the solar photovoltaic power generation unit are converged to a DC bus through a power electronic conversion device, the hybrid energy storage device is connected with the DC bus through a bidirectional power converter, the DC bus exchanges energy with an AC bus through a DC/AC converter, and a medium wind power generator is connected with the AC bus. According to the energy management and coordination control system and method, a multi-agent coordination control system can be applied to a micro grid monitoring system and is developed based on a JADE platform, and energy management and optimal scheduling of the micro grid can be achieved.

The invention aims at providing an electricity generation ship capable of comprehensively utilizing renewable energy sources. The electricity generation ship comprises a photovoltaic electricity generation cell panel, a wind electricity generation set and a hydro electricity generation set, and independent photovoltaic electricity generation, wind electricity generation and hydro electricity generation can be carried out. The photovoltaic electricity generation cell panel, the wind electricity generation set and the hydro electricity generation set can be connected into a chip power grid at the same time for grid-connected electricity generation. When the hydro electricity generation set participates in electricity generation, a ship body is generally fixed, and a nose faces water flow. When only the photovoltaic electricity generation cell panel and the wind electricity generation set carry out electricity generation, the ship can run. Offshore wind energy, solar energy and tidal current energy are used for electricity generation to guarantee electricity in the initial stage of development of islands, and the ship can run to various islands and offshore platforms badly in need of electric energy to provide electric energy. Therefore, compared with other ships, the electricity generation ship is remarkable in effect of energy saving and emission reduction, and the emission of greenhouse gases is reduced to a large degree.

The invention relates to an arc-control device applied in a photovoltaic combiner box. The arc-control device particularly comprises a confluence branch which is formed by electrically connecting a photovoltaic negative electrode busbar, a special photovoltaic fuse, a special photovoltaic diode and a photovoltaic positive electrode busbar in sequence, and a detection and control circuit which is formed by a resistor divider module, a voltage comparison module, a timer module, a signal processing module, an RS 485 communication module, a two-input OR gate, a driving circuit module and an IGBT (Insulated Gate Bipolar Transistor) module; and the invention also relates to a combiner box arc-control method applying the arc-control device.

The invention provides a device for generating hydrogen by electrolyzing water by using a solar thermophotovoltaic system and belongs to the technical field of solar utilization and hydrogen production by electrolysis. The device consists of two main parts: an improved solar thermophotovoltaic system and a water electrolysis-based hydrogen generation system. The improved solar thermophotovoltaic system has higher conversion efficiency and high output power than a system based on common photovoltaic technology and can provide sufficient current power supply for a water electrolysis-based hydrogen generation device. The device uses the power generated by the system in hydrogen generation by electrolysis, the hydrogen is stored, and thus, the problem that the output of the photovoltaic power generator varies with the change of weather and the alternation of day and night. In addition, the cooling of a photovoltaic cell in the device is liquid cooling, the aqueous solution for electrolysis is preheated before being introduced into an electrolytic cell, the power consumption in an electrolysis process is reduced, and thus, the solar utilization rate is further improved.

The invention provides a solar photovoltaic power generation pavement and an application thereof. The solar photovoltaic power generation pavement at least comprises a subgrade, a base course, a surface course, a solar photovoltaic power generation layer and a light-transmitting friction course in sequence from bottom to top. According to the solar photovoltaic power generation pavement and the application thereof, a solar photovoltaic power generation technique can be organically integrated under the circumstance of ensuring vehicle safety operation so as to realize coordinated operation of a road traffic function and a photovoltaic power generation function.

The invention provides a photovoltaic power generation planning method for a photovoltaic power generation system. The method includes the following steps: (a) obtaining an estimated power generation of the photovoltaic power generation system according to a formula, wherein HA is the amount of a total horizontal solar irradiation, Es is the sunlight intensity under the standard state, PAZ is the installed capacity of the photovoltaic system and K is a combined efficiency coefficient; the combined efficiency coefficient comprises a component type correction coefficient, a photovoltaic array obliquity and azimuth correction coefficient, a photovoltaic power generation system availability coefficient, a sunlight utilization rate coefficient, an inverter efficiency coefficient, a photovoltaic module surface contamination correction coefficient, and a photovoltaic module conversion efficiency correction coefficient; and (b) adjusting the actual power generation of the photovoltaic power generation system according to the estimated power generation. The photovoltaic power generation planning method of the invention takes the whole photovoltaic power generation into overall consideration to determine the combined efficiency coefficient K, so that the obtained combined efficiency coefficient K is more accurate.

The invention provides a grid-tied testing device for wind electricity and photovoltaic energy and a testing method thereof. The testing device comprises a power converter, a series connection transformer, a shunt transformer, an input breaker, an output breaker, a protective breaker, a first function change-over switch, a second function change-over switch, a third function change-over switch, a fourth function change-over switch, a by-pass switch and a digital signal processor (DSP) control and detection unit. An input end of the testing device is connected with a power grid, and an output end of the testing device is connected with a wind generating set or a photovoltaic generating station as a device to be tested. Deviation voltage or harmonic voltage output by the power converter and nominal voltage or fundamental voltage of the power grid are overlaid for achieving power grid adaptability requirements, and therefore the capacity of the power converter is far smaller than the rated capacity of the device to be tested. Due to the fact that the capacity of the power converter is reduced, the purposes that a system is low in cost, small in size, light in weight, small in heating value, high in reliability and the like can be achieved.

The invention discloses a method for achieving power grid light storage system capacity configuration and optimization distribution. The method for achieving the power grid light storage system capacity configuration and the optimization distribution includes the following steps: (1) a photovoltaic electricity generation grid-connected system model is established; (2) the model is conducted with load flow calculation, and whether power grid operation meets constraint conditions is judged; if the power grid operation meets the constraint conditions, a next step is conducted; and if the power grid operation does not meet the constraint conditions, the step (1) is returned to, and a power grid parameter is modified; (3) initial emulating calculation is conducted to obtain an index value before energy storage system access; (4) N access points of an energy storage system are conducted with emulating calculation, so that an index value after the access is obtained; (5) an index of each access point is conducted with normalization processing, so that an objective subfunction is generated; (6) N objective functions with variable balance coefficients are obtained through the generated objective subfunction; (7) an assessment result is obtained through objective function computational analysis; and (8) the assessment result is conducted with optimal value choices. According to the method for achieving the power grid light storage system capacity configuration and the optimization distribution, a power grid is provided with fast active and reactive power support. The power grid voltage stability level is improved, and the network loss is lowered. Besides, the accuracy and the generality are improved.

The invention relates to the technical field of power systems, and particularly discloses a multi-time-scale prediction method of photovoltaic generation power. The multi-time-scale prediction methodof the photovoltaic generation power includes: acquiring basic data required for photovoltaic generation power prediction, wherein the basic data include season types, weather types, temperature, windspeed and historical photovoltaic generation power; classifying historical photovoltaic generation power of the same season according to the weather types; establishing a feature set for photovoltaicgeneration power data under the same weather type; establishing a photovoltaic generation power prediction model of a deep ridgelet neural network (DRNN) according to the feature set; and acquiring amulti-time-scale prediction result of the photovoltaic-method generation power through the established photovoltaic generation power prediction model of the deep ridgelet neural network. The multi-time-scale prediction method of the photovoltaic generation power provided by the invention has the advantages of high running efficiency and high prediction precision.

The invention discloses a method for determining the credibility of photovoltaic power capacities. The method comprises the following steps of: (1) creating a time-interval model of a hybrid power generation system containing a photovoltaic power station; (2) calculating a daytime reliability index Rd and a night reliability index of an original power generation system not containing a photovoltaic power station, and superimposing the indexes to obtain a synthetic reliability index Rx of the original power generation system; (3) connecting a photovoltaic power station to the original power generation system, and adjusting the load level of the hybrid power generation system with Ry and Rd as targets, thus obtaining a new load level of the hybrid power generation system; and (4) replacing the photovoltaic power station with a virtual conventional unit, performing iterative computation respectively at the new load level to obtain a daytime generating capacity Cy and a whole day generating capacity credibility Cd of the photovoltaic power station. By virtue of the method, the improvement on the daytime reliability of the system after the photovoltaic power station is added can be clearly investigated, and the credibility of the daytime and full-day photovoltaic power capacities can be calculated.

The invention discloses a split type flat-plate solar photothermal and photovoltaic system, and belongs to the technical field of water heating equipment. The system comprises a solar photovoltaic generation component, a flat-plate solar thermal collector, an adjustment controller, a storage battery, an inverter, a power supply control cabinet, a controller, a water tank and a circulating pump, wherein the solar photovoltaic generation component is connected with one end of the flat-plate solar thermal collector; the flat-plate solar thermal collector is provided with a pipe type heat absorber; a water inlet and a water outlet of the pipe type heat absorber are connected with the water tank; the adjustment controller is connected with the inverter; the inverter is connected with the power supply control cabinet; the power supply control cabinet is connected with the controller; the storage battery is connected with the adjustment controller; an electric heater is arranged in the water tank and is in electrical connection with the controller; the water tank is provided with a tank upper water level sensor and a lower water level sensor; and the circulating pump is arranged on a pipeline and is in electrical connection with the controller through a circuit. The invention has the advantages that the system avoids light influence, and meets requirements of the water tank for continuous water supply.

The invention relates to a method for judging a direct current arc fault based on a real-time measured multi-band frequency component rate. Along with the large-scale application of photovoltaic generation, and particularly the wide application of a photovoltaic solar panel to the roof and the external wall of a building, fires caused by a photovoltaic generation system happen in many places. Through analysis, people find that the fires are basically caused by the direct current arc fault of the photovoltaic generation system, and therefore, detecting and isolating the direct current arc fault for causing equipment damage and fire hidden danger become problems needed to be solved, however, due to the specificity of the direct current arc fault of the photovoltaic generation system, the conventional fault waveform based arc fault detection principle is not suitable for the direct current arc fault of the photovoltaic generation system. The method has the core thought that the overlarge energy is contained in the arc to cause the fire damage caused on the basis of the fault arc, and by using a method for detecting the energy source ratio of the frequency spectrum component energy of multiple bands in a voltage and current waveform to the total spectrum, the direct current arc faults possibly causing fires can be rapidly and reliably detected without being affected by other noises in the system, and the safety of the photovoltaic generation system is ensured.