135 results about "Power optimizer" patented technology

A renewable energy, utility size electric power system is provided with a high voltage, renewable energy harvesting network connected by a direct current link to a centralized grid synchronized multiphase regulated current source inverter system. The harvesting network includes distributed renewable energy power optimizers and transmitters that control delivery of renewable energy to the grid synchronized multiphase regulated current source inverter system. A visual immersion monitoring and control system can be provided for a three-dimensional, visually-oriented, virtual reality display, command and control environment.

The invention discloses a high-efficiency photovoltaic module power optimizer. The optimizer comprises a controller, a DC/DC converter, a current sensor, a voltage sensor, semiconductor electronic switches K1, K2, K3 and K4, a communication interface and the like. The controller samples the data of the voltage and the current of a photovoltaic module, and the data of the output voltage and the output current of the DC/DC converter, and calculates the maximum output power of the photovoltaic module in real time according to sampled data, and at last, the controller sends out a PWM signal to drive the DC/DC converter to carry out energy conversion. The controller further judges whether substrings of the photovoltaic module and the module are abnormal or not according to the sampled current data and voltage data, and when a fault happens, the substring or the module which breaks down is bypassed. Therefore, the power generation quantity of a photovoltaic power generation system is increased, and the situation that because a photovoltaic module breaks down or module substrings break down, the whole photovoltaic set string loses efficacy is effectively avoided.

The application provides a distributed photovoltaic inverter system and a power-limiting control method thereof. An inverter generates and outputs a power difference value according to a preset power limit value and a grid-connected main power obtained by real-time collection; and when the power difference value meets a preset power-limiting condition, power adjusting modules in N independent power optimizers adjust PV voltages at respective input sides synchronously until the power difference value does not meet the preset power-limiting condition. Therefore, power-limiting control of the distributed photovoltaic inverter system is realized without the need to limit the grid-connected current of the inverter. Besides, because the PV voltages at respective input sides of all power optimizers are adjusted synchronously until the power difference value does not meet the preset power-limiting condition, the output limiting on the total output power of the whole inverter system is realized, so that problems in the prior art are solved.

The invention relates to a high-efficiency low-loss hardware circuit of a photovoltaic cell panel output power optimizer. The hardware circuit comprises a circuit for maximizing the output power of a single photovoltaic cell panel set string; a circuit for disconnecting the output of cell panels in the string when the current loss of the photovoltaic cell panel set string is detected; circuits of bypass shading cell panel substrings and an output current sampling circuit. Because of low-pressure-drop power MOSFETs, the whole circuit has the advantages that high efficiency and low loss are achieved in control over the output power of the photovoltaic cell panels; because of output disconnection between the bypasses of shading cell panels and a cell panel which breaks down, it can be guaranteed that the output power of the whole cell panel array is maximum; moreover, when a system breaks down, output is rapidly closed to isolate the fault, safety and reliability are improved.

The invention relates to a photovoltaic power optimizer, which belongs to the technical field of photovoltaic power generation system application. The technical scheme comprises a plurality of paths of serial and parallel battery packs. Each panel is connected with a DC-DC power optimizer with a maximum power point tracking (MPPT) function, and has output which is connected to an input point of the DC-DC power optimizer. The photovoltaic power optimizer has the advantages that: the DC/DC power optimizer monitors and optimizes the electric energy of each photovoltaic panel and still enables the other panels to output maximum power even though any panel in an array is mismatched so as to compensate generated energy loss caused by the mismatching; and the DC/DC power optimizer can be rapidly and easily arranged in a solar photovoltaic system.

The invention relates to the solar energy application technology field and provides a photovoltaic system of a non-communication power optimizer and an open circuit fault diagnosis method thereof. The system comprises a pre-stage non-communication series connection type power optimizer and a backward-stage inverter, wherein the pre-stage non-communication series connection type power optimizer is used for tracking a maximum power point of a photovoltaic component, transmitting electric energy output by the photovoltaic component and determining and acquiring an inverter fault state according to an inverter open circuit fault diagnosis model; and the backward-stage inverter is used for inverting a direct current output by the power optimizer into an alternating current and then merging into a power grid. The open circuit fault diagnosis method comprises the following steps that based on the above system, the power optimizer collects a self-inductance current and an output voltage in real time and carries out AD conversion on the current and the voltage; and if the power optimizer determines and acquires that an inverter generates an open circuit fault according to the inverter open circuit fault diagnosis model, electric energy output is stopped. By using the photovoltaic system and the open circuit fault diagnosis method, instability of communication between the power optimizer and the inverter is avoided and system reliability is increased to a certain extent.

A renewable energy, utility-size electric power system is provided with a high voltage, renewable energy harvesting network connected by a direct current link to a centralized grid synchronized multiphase regulated current source inverter system. The harvesting network includes distributed renewable energy power optimizers and transmitters that control delivery of renewable energy to the grid synchronized multiphase regulated current source inverter system by step-up voltage boost of the DC voltage from the renewable energy sources in combination with a DC-to-DC conversion where the stepped-up voltage of the renewable sources is utilized as a positive high voltage DC output across the input of an inverter used in a DC-to-DC converter to establish an equal magnitude negative high voltage DC output across a rectified output of the inverter. A visual immersion monitoring and control system can be provided for a three-dimensional, visually-oriented, virtual reality display, and command and control environment.

Building integrated photovoltaic (BIPV) systems provide for solar panel arrays with improved aesthetics and efficiency that can replace a conventional roof surface structure. These BIPV systems can utilize photovoltaic PV roof tiles defined as glass tiles having photovoltaic elements embedded or incorporated into the body of the roof tile. Such PV roof tiles can include one or more lapping features for interfacing with adjacent tiles and features for electrically connecting multiples tiles within a course to an external power optimizer. Such PV roof tiles can utilize stamped glass that is stamped to define these features within an integrated glass tile and can further include texture, striations on the glass tile and/or color matched back layers or various other components to obscure visibility of any embedded solar cells and provide a more pleasing appearance.

The invention discloses a power control method of a photovoltaic power generation system and power optimizers thereof. When limiting of output power is required by the photovoltaic power generation system, an inverter is used to limit output current, and therefore rising of direct current busbar voltage and the output voltages of the various power optimizers can be caused, and then the power optimizers are used to compare the own output voltages with a corresponding threshold value, and is used to switch the own operation modes in a real-time manner according to the output voltages. Compared with the control way of the prior art based on communication, response is faster, and reliability is higher.

The invention provides a photovoltaic power generation system and an assembly IV curve scanning method thereof. Assembly IV curve scanning is performed at different moments by taking group as unit according to a preset grouping rule and an assembly IV curve scanning instruction after the assembly IV curve scanning instruction sent from an upper computer is received by each power optimizer, and scanning data is uploaded. IV curve scanning is performed on a connection assembly connected with the power optimizer at each moment only by a group of power optimizer, the other power optimizers and corresponding assemblies are all in normal working conditions, thus, relatively small influence on an output power of the system is generated, and the problem of large output power fluctuation of the system in the prior art is prevented.

The invention discloses a distributed inversion system and a starting method thereof. An inverter of the distributed inversion system determines whether the system satisfies a preset starting condition; when the distributed inversion system satisfies the preset starting condition, the inverter communicates with N power optimizers of independent control, so that all the power optimizers are notified to start in the output voltage source mode; when the inverter determines that the voltage of a DC bus satisfies a first preset soft start condition, the inverter is started softly and establishes an inversion voltage; and when the inverter determines that the inversion voltage satisfies a second preset soft start condition, an AC contactor is closed. The first and second preset soft start conditions are determined to ensure that the voltage between the two ends of the inverter satisfies the soft start conditions before the inverter is started, and solve the problem that impact current of AC/DC capacitors is too high when the inverter is started under the condition that the voltage of the DC bus is too low.

The invention provides a photovoltaic power optimizer and a control method and device thereof and a photovoltaic power generation system. The photovoltaic power optimizer comprises a power optimization module, a bypass module and a control module. The bypass module is connected with the input end of the power optimization module, the output end of the power optimization module and the control module. The control module is connected with the power optimization module. The control module is used for controlling the bypass module to be conducted when the fault of the power optimization module isdetected so that the power optimization module having the fault is enabled to be bypassed, and a photovoltaic cell component is enabled to be directly connected in series with other cell packs of thephotovoltaic power generation system and accessed to the inverter. Then the power generated by the photovoltaic cell component can be effectively outputted so that waste of power caused by the fault of the power optimization module can be avoided.

A renewable energy, utility-size electric power system is provided with a high voltage, renewable energy harvesting network connected by a direct current link to a centralized grid synchronized multiphase regulated current source inverter system. The harvesting network includes distributed renewable energy power optimizers and transmitters that control delivery of renewable energy to the grid synchronized multiphase regulated current source inverter system. A visual immersion monitoring and control system can be provided for a three dimensional, visually oriented, virtual reality display, and command and control environment.

The invention discloses a power optimizer and a control method and a control device thereof. The method comprises the following steps: determining a current working mode of the power optimizer, wherein the power optimizer is provided with a plurality of working modes in advance, the plurality of working modes comprising a Boost mode, a Buck mode and a direct mode; if the power optimizer works in the Boost mode or the Buck mode currently, adjusting duty ratio of each switching tube in the power optimizer through a maximum power point tracking algorithm until meeting a first preset condition, and then, switching to the direct mode; and if the power optimizer works in the direct mode currently, switching to the Boost mode when meeting a second preset condition and switching to the Buck mode when meeting a third preset condition, thereby improving efficiency of the power optimizer.

The invention relates to a method for switching power optimizers for photovoltaic modules among different working modes. A battery serial group comprises multiple photovoltaic modules in serial connection, each photovoltaic module is configured with a power optimizer for executing the maximum power point tracking, the power optimizers corresponding to various photovoltaic module in the battery serial group are serially connected to form a link and provide series voltage; the series voltage provided by the link affiliated power optimizer in a to-be-switched working mode is transiently short-circuited, and the variable quantity of the predetermined index induced by the short-circuit of the series voltage in the transiently short-circuited link is detected, when the variable quantity meets apreset variant condition, the power optimizer in the to-be-switched working mode is completely switched to the other working mode from one working mode.

The disclosure relates to technology for providing power, voltage, and/or current from a combination of photovoltaic modules. In one aspect, a system has central power optimizer, which is located between a group of distributed power optimizers and a solar inverter. Each distributed power optimizer may be connected to the DC output of one photovoltaic modules, and may be used to regulate the power output of the photovoltaic module. The combined DC voltages of the distributed power optimizers may be provided to the input of the central power optimizer.

The invention provides a photovoltaic assembly power optimizer and a photovoltaic power generation system therewith. The system comprises the photovoltaic assembly power optimizers and a combiner box. The photovoltaic assembly power optimizers are used for photovoltaic assembly power optimization and maximum power tracking, wherein a plurality of photovoltaic assembly power optimizers are connected in series to form a string. The combiner box is used for enabling the photovoltaic assembly power optimizers of at least two strings to be connected in parallel for combination, and enables the combination information and the state information of all optimizers to be transmitted to a controller or a remote monitor. The system not only can improve the output power under a shielding condition, also can monitor the working state of each assembly, and facilitates maintenance.

The invention discloses a distributed energy source system used for a solar unmanned aerial vehicle. The system is characterized by at least comprising a plurality of photovoltaic modules, a power optimizer electrically connected to each photovoltaic module, a high-voltage bus of 80V-120V and a low-voltage bus of 27V-29V, wherein each power optimizer comprises an MPPT controller and a DC-DC converter; an output terminal of each photovoltaic module is electrically connected to an input terminal of one DC-DC converter; a transmission conductor between the photovoltaic module and the DC-DC converter module is connected to the MPPT controller; after connected in series in sequence, the DC-DC converters are connected to the high-voltage bus of 80V-120V; after connected in series in sequence, the DC-DC converters are connected to a lithium ion battery series; and after connected in series in sequence, the DC-DC converters are connected to the low-voltage bus through one DC-DC converter. According to the system, the conversion efficiency of the photovoltaic modules can be improved.

The invention relates to a photovoltaic power optimizer and system based on LORA wireless communication. The system comprises multiple photovoltaic power optimizers, an LORA gateway and an LORA server, wherein each photovoltaic power optimizer is provided with an LORA wireless communication module, point-to-point communication is achieved between each photovoltaic power optimizer and the LORA gateway through an LORA network, and each photovoltaic power optimizer is used for receiving instructions from the server, acquiring local data and sending the data to the LORA gateway according to an LORA protocol; the LORA gateway and the LORA server are connected through Ethernet, and data transmission between each photovoltaic power optimizer and the LORA server is achieved through the LORA gateway. Communication is achieved by means of the LORA wireless communication modules with high anti-interference performance and spread spectrum communication function, the problem of communication of photovoltaic power optimizers in the photovoltaic production area can be solved, data transmission reliability and long-distance transmission capacity are improved, and power consumption is reduced.

The invention provides an ant colony-artificial immune hybrid optimization algorithm-based maximum power point-tracking solution in a set of photovoltaic power generation system, in particular to a maximum power point-tracking photovoltaic system based on an ant colony-artificial immune hybrid optimization algorithm. The ant colony algorithm has a powerful advantage in solving the complex combinatorial optimization problem but has certain defects as well, and aimed at the problem that individual ants in the ant colony algorithm lack the ability of identifying problem characteristic information, the idea of vaccine in the immune algorithm is introduced into the ant colony algorithm to provide the ant colony-immune hybrid algorithm. Power optimizers applying the algorithm carry out dual-tracking on solar panels; on one hand, the optimal local MPP (maximum power point) is tracked; and on the other hand, the energy transmission in the system is increased to the max. The power optimizers are indirectly connected with one another, have cognitive ability and self-organization ability, and can detect and independently regulate respective current and voltage environments until the whole string of solar panels reaches an optimal value, and meanwhile, the level of the solar panels reaches a local optimal point.

The invention provides a photovoltaic microgrid system and a photovoltaic microgrid system control method. The photovoltaic microgrid system comprises a plurality of twin-stage photovoltaic power generation sub systems in parallel, wherein any one of the twin-stage photovoltaic power generation sub systems comprises a plurality of powder optimizers, a plurality of power optimizer control units, a centralized inverter and a centralized inverter control unit. The photovoltaic microgrid system control method comprises the following steps of: acquiring active power and passive power output by the centralized inverter for any one of the photovoltaic power generation sub systems; acquiring the available maximum active power and the available maximum passive power of the centralized inverter; and acquiring a reference voltage; and generating a control signal of the centralized inverter. The photovoltaic microgrid system and the photovoltaic microgrid system control method provided by the invention realize coordinated control of the plurality of photovoltaic power generation sub systems in a communication-free condition, so that autonomous and reasonable distribution of load power is guaranteed and the voltage and frequency of the photovoltaic microgrid system are stable.