1685 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.

The present invention relates generally to the photovoltaic generation of electrical energy. The present invention relates more particularly to photovoltaic roofing elements having a structured profile. For example, one aspect of the invention is a structured photovoltaic roofing element including: a structured roofing substrate presenting on its top-facing surface a plurality of differently-shadowable zones; and a plurality of bypassable photovoltaic elements, each of the bypassable photovoltaic elements comprising a bypass diode connected in parallel with a photovoltaic element, each of the bypassable photovoltaic elements being disposed in a differently-shadowable zone; wherein one or more of the bypassable photovoltaic elements is disposed in a different differently-shadowable zone than one or more of the other bypassable photovoltaic elements.

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 provides solar concentrators incorporating photovoltaic receiver assemblies with improved thermal dissipation, dielectric, encapsulation, and cell / wiring protection characteristics. The concentrators are particularly useful for photovoltaic power systems such as rooftop mounted systems. The present invention teaches that the geometry of the substrate used to support receiver assemblies can have a dramatic impact upon thermal / dielectric performance. In particular, the present invention teaches how contours incorporated into such substrates can improve thermal performance (i.e., dissipation of thermal energy from photovoltaic cells through the substrate) while still maintaining dielectric and encapsulation objectives. In the past, dielectric and encapsulation objectives have been obtained at the expense of such thermal dissipation. Also, material choice and form also impacts thermal, dielectric, and encapsulation performance. In preferred embodiments, components of receiver assemblies are provided in sheet form and laminated together in the course of making the receiver assemblies.

The invention discloses a multi-objective optimization scheduling method for an electric vehicle charging station including a photovoltaic power generation system, and belongs to the technical field of smart power grids. Power purchase cost minimization and circulating electric quantity minimization of an energy storage system are used as objective functions, and a multi-objective optimization scheduling model of the electric vehicle charging station including the photovoltaic power generation system is built; the decision variable of the scheduling model and the constraint condition of the decision variable are determined; basic data are determined; solution is carried out through a multi-objective optimization algorithm to obtain a non-dominated solution leading surface, and then multiple Pareto optimal solutions are obtained; according to the low comprehensive cost of the main circulating electric quantity of the energy storage system and the power purchase cost, the charging station scheduling optimal scheme is selected at last. The multi-objective optimization scheduling method is suitable for the electric vehicle charging station including the photovoltaic power generation system of various cities with rich light sources; the scheduling scheme of the electric vehicle charging station including the photovoltaic power generation system is optimized; theoretical bases and technical supporting can be provided for the scheduling of the electric vehicle charging station including the photovoltaic power generation system; the operation economical efficiency of the charging station is improved.

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.

Characters of the invention are that first, microprocessor obtains information of voltage and current of light-volt array; using algorithm for tracking maximum power in order to determine operating point of light-volt array at next moment; through A / D convertor, the information is converted to reference point Vref. After proportional integral PI adjusts difference value between Vref and sampled actual voltage of light-volt array, PWM control chip generates PWM wave with certain duty ratio to control DC-DC convertor. The method can implement coordinational operation of two branches and multiple branches in plug and play mode. Voltage control mode insensitive to maximum power point is adopted in the invention. Tracking effect is raised by method maximum power point instead of method of current tracking. Being in use for power supply for multiple DC loads, the system is applicable to independent light-volt system as well as to networked light-volt system.

The invention provides a grid-connected solar photovoltaic power station monitoring system which can monitor the temperature of a photovoltaic array group string, an output current voltage and direct current (DC) combiner box, a DC combiner box, a DC power distribution cabinet, an inverter, an alternating current (AC) power distribution cabinet, in-out current voltages of a boosting transformer, input current voltages of a grid-connected point, and the environment temperature, the light irradiance and the wind speed and direction of the solar photovoltaic array group string. Measured data of all the components are gathered comprehensively, essential information of a power station, test data of monitored components and environment meteorological data are displayed and stored in real time, information such as the running conditions of the monitored components and the performance ratio of the power station is calculated out, and an actual measurement operational data base of the power station is established. The components of the photovoltaic power station and the performance and the reliability of the system are estimated comprehensively, the optimization design of photovoltaic components and the system is promoted, and real and reliable data support is provided for the research and development and the improvement of photovoltaic power generating technology.

The invention discloses a photovoltaic power station output predicting method based on the optimal similar day set. The photovoltaic power station output predicting method includes steps of 1) subjecting historical data to exception handling; 2) normalizing weather types and solar irradiance as characteristic vectors of similar output level days and clustering the same for analysis through cluster algorithm and determining the final similar output level day set; 3) selecting photovoltaic generation output power as characteristic vectors of similar curve-shape days, normalizing the photovoltaic generation output power and then clustering the same for analysis through the cluster algorithm so as to obtain classification results of different cluster numbers, and finally determining a final similar curve-shape day set; 4) acquiring the type which predicting days belong to according to the maximum principle of coefficient of association; 5) constituting the optimal similar set; 6) utilizing the optimal similar set as input and establishing an output predicting model to predict photovoltaic power of the predicting days. The photovoltaic power station output predicting method can accurately predict by selecting a history data with the highest correlation with a predicting day and is simple and feasible, and accuracy in prediction of the photovoltaic generation output power is improved.

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 present invention relates generally to the photovoltaic generation of electrical energy. The present invention relates more particularly to photovoltaic arrays for use in photovoltaically generating electrical energy. Aspects of the present invention provide a variety of photovoltaic roofing elements and systems that include, for example, interlocking geometries to provide for water handling and integration with conventional roofing materials; and wire management features that can protect wiring and associated electrical components from physical and / or environmental damage.

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 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 comprising: a flexible roofing substrate; a photovoltaic element disposed on the flexible roofing substrate; and an electrical connector operatively coupled to the photovoltaic element, wherein the flexible roofing substrate has formed therein a recess shaped to at least partially receive the electrical connector.

The invention provides a photovoltaic power generation system performance evaluation method and device which are applied to the technical field of electronics. The method includes the steps of obtaining running data and meteorological data of a photovoltaic power generation system; calculating the function relation between theoretical output power of the photovoltaic power generation system and solar irradiance under a set reference temperature condition; obtaining the corresponding relation among actual output power of the photovoltaic power generation system, the temperature of a photovoltaic assembly and the solar irradiance; converting the actual output power to the power under the set reference temperature condition, and obtaining reference actual output power; determining the corresponding relation between the reference actual output power and the solar irradiance; drawing a curve of the theoretical output power; drawing a scatter diagram of the reference actual output power; evaluating performance of the photovoltaic power generation system. By means of the method and the device, a maintenance plan is made as required, the running and maintenance level of the photovoltaic power generation system is optimized, and life-cycle maintenance cost of the device is reduced.

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 solar photovoltaic generating applications, and in particular relates to a multi-mode photovoltaic generating system, wherein the multi-mode photovoltaic generating system mainly adopts off-grid power generation, and can release gird-connected power generation as for the surplus electric energy which is not consumed completely by a DC (direct-current) emergency load and storage batteries. The system comprises a controller, solar-cell arrays, a storage battery, the DC emergency load, a grid-connected inverter and a public distribution network, wherein a part of DC electric energy output by the solar-cell arrays is supplied for the DC emergency load by a DC bus, and the other part of the DC electric energy output by the solar-cell arrays is stored in the storage batteries. When the voltage of the DC bus is out of the normal range, the storage batteries supply the energy for the DC emergency load by a charge-discharge controller; and when the storage batteries finish the charging and the voltage of the DC bus is within the normal range, the surplus DC electric energy can be converted into AC (alternating-current) electric energy by a DC boost converter and a grid-connected inverter and then the AC electric energy is transmitted to the public distribution network. The system provided by the invention can improve the efficiency and the time of annual power generation of the system, and has good application prospects.

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.

An apparatus, system, and method are disclosed for expandable photovoltaic electricity generation for a motorized vehicle. The present invention includes one or more retractable photovoltaic panels configured to increase solar energy collection when deployed. The invention further comprises a storage module configured to hold the photovoltaic panels when not in use. The storage module is portable with the motorized vehicle.

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 discloses a method for predicting electricity generation power of a photovoltaic power station in a step-by-step way. The method is used for reducing the influence of correlative coupling between input variables of a prediction model on prediction performance and improving the prediction effect. According to the technical scheme provided by the invention, the method comprises the following steps: selecting meteorological parameters having influence on photovoltaic electricity generation power as electricity generation power meteorological factors based on a statistical rule of historical data of the photovoltaic power station; predicting the meteorological factors by using an intelligent method; and finally, mapping by using a prediction result of the meteorological factors and an electricity generation power characteristic model of the photovoltaic power station to obtain a prediction value of the electricity generation power of the photovoltaic power station. The method has clear physical significance and contributes to implementation of a prediction algorithm and the model in engineering practice, and the accuracy for electricity generation power prediction of the photovoltaic power station is improved.

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 lightning-proof electric control device of a photovoltaic power generation system, which is arranged in the photovoltaic power generation system and comprises lightning arresters, a special grounding wire, lightning-proof devices and a surge protector. The lightning arresters are arranged on non-conductive roofs of a photovoltaic battery assembly support, a controller and an inverter; the special grounding wire is used for connecting a metal device in the lightning-proof electric control device with a grounding main line; the lightning-proof devices are arranged in asolar battery square matrix connection box, the controller and the inverter; and the surge protector is arranged at an alternating current output end. In the embodiment of the invention, the lightning-proof electric control device of the photovoltaic power generation system avoids influencing normal work due to the damage of the photovoltaic power generation system under the thunder and lightningfunction through equipment including the lightning arresters, the lightning-proof device and the like arranged in the photovoltaic power generation system, so as to achieve the aim of improving the work stability of the photovoltaic power generation system.

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.