64 results about "Maximum power point tracking controller" patented technology

Distributed maximum power point tracking systems, structures, and processes are provided for power generation structures, such as for but not limited to a solar panel arrays. In an exemplary solar panel string structure, distributed maximum power point tracking (DMPPT) modules are provided, such as integrated into or retrofitted for each solar panel. The DMPPT modules provide panel level control for startup, operation, monitoring, and shutdown, and further provide flexible design and operation for strings of multiple panels. The strings are typically linked in parallel to a combiner box, and then toward and enhanced inverter module, which is typically connected to a power grid. Enhanced inverters are controllable either locally or remotely, wherein system status is readily determined, and operation of one or more sections of the system are readily controlled. The system provides increased operation time, and increased power production and efficiency, over a wide range of operating conditions.

Disclosed is a maximum power point tracking charge controller for double layer capacitors intended for uses with non-ideal power sources such as photovoltaics.

A system and a method provide a photovoltaic system which regenerates the output characteristics of the photovoltaic at different ambient condition with high precision under all environmental conditions. The photovoltaic system includes a photovoltaic array, a buck / boost converter, a DC link capacitor to connect the buck / booster converter to a load / inverter, an adaptive network-based fuzzy inference maximum power point tracking controller, a voltage control loop, a proportional integral controller to maintain the output voltage of the photovoltaic array to the reference voltage by adjusting the duty ratio of buck / boost converter.

A simple feedback control loop, in conjunction with an improved maximum power point tracking intermediate controller, can be used ensure efficient operation of a power generator. The improved maximum power point tracking controller operates the generator at its maximum allowable power point. A power output of the generator is measured and compared to a power output setpoint. Operating characteristics of the generator are then adjusted to cause the maximum allowable power point and measured power output to approximate the power output setpoint. Although applicable to all types of generators, this is particularly beneficial in fuel cell generator systems and other systems where damage to generator components can occur if operated above a maximum allowable power output level. In other systems, the maximum allowable power output may approach or equal a maximum power point (or maximum possible power point).

Distributed maximum power point tracking systems, structures, and processes are provided for power generation structures, such as for but not limited to a solar panel arrays. In an exemplary solar panel string structure, distributed maximum power point tracking (DMPPT) modules are provided, such as integrated into or retrofitted for each solar panel. The DMPPT modules provide panel level control for startup, operation, monitoring, and shutdown, and further provide flexible design and operation for strings of multiple panels. The strings are typically linked in parallel to a combiner box, and then toward and enhanced inverter module, which is typically connected to a power grid. Enhanced inverters are controllable either locally or remotely, wherein system status is readily determined, and operation of one or more sections of the system are readily controlled. The system provides increased operation time, and increased power production and efficiency, over a wide range of operating conditions.

The configurations of photovoltaic system and methods thereof are provided. The proposed photovoltaic system includes a PI-INC MPPT controller using a constant-frequency variable-duty (CFVD) control and guided by an Ipv-Vpv curve and a Ppv-Vpv curve.

Provided are a solar energy generation system having an adaptive maximum power point tracking function and a method thereof. The solar energy generation system includes: a minimum maintenance voltage determination unit configured to output a minimum maintenance voltage which enables the inverter to maintain an operation thereof corresponding to a grid voltage of the grid; a maximum power point tracking controller configured to determine a maximum power point tracking voltage at a maximum power point of the photovoltaic module, using the minimum maintenance voltage and an output voltage and output current of the photovoltaic module, and to output a reference voltage to track the maximum power point; a voltage calculator configured to calculate a difference between the reference voltage and the output voltage of the photovoltaic module; and a voltage adjuster configured to generate a reference current value using an output of the voltage calculator.

The invention belongs to the light volt generating system controlling technology domain, the independent light volt generating system based on the maximal power point tracing technology includes: (1)the solar cell; (2)the storage cell; (3)BUCK circuit; (4)the light voltage combining net system. Because of the light volt cell array having the dP / Dv and I almost linear characteristic connection when working in the maximal power working point and the stable working zone. The invention is aiming at the adopt the light volt array output circuit, the MPPT controlling of the light volt array can be realized by controlling BUCK circuit accounting empty percent as the power switching tache or the PWM driving signal of the combining net system reverse changing machine. When the light intension has the quick change, the light volt array output circuit can trace the change with the lineal, the quick and the smooth mode, the light volt cell array maximal power point trace controlling can be realized better.

The present invention relates to power supplies, and more particularly, to a power supply having a maximum power point tracking function that controls power switching so that a detected power value is within a reference range having a maximum power point in a predetermined current-voltage curve. A power supply having a maximum power point tracking function according to an aspect of the invention includes: a converter section switching input power and converting the switched input power into predetermined DC power; and a maximum power point tracking section detecting a power value determined according to a switching operation of the converter section among power values included in a predetermined power-voltage curve, and controlling the switching operation of the converter section so that the detected power value is located within a predetermined reference range having a maximum power value among the power values included in the power-voltage curve.

The invention discloses a maximum power point tracking controller for a three-phase photovoltaic power generation system. The controller mainly comprises a BOOST type DC / DC converting circuit, a three-phase inversion circuit, a control circuit and a power circuit. The technical scheme includes that a variable-structure fuzzy control method is applied to MPPT (maximum power point tracking) of photovoltaic power generation so that tracking precision can be improved, and the method can effectively realize maximum power point tracking when illumination and temperature vary. By means of variable-structure fuzzy control, different fuzzy sub-controllers are designed according to different working conditions, the discourse domain range, control rules, parameters and the like of the fuzzy sub-controllers are different, the fuzzy sub-controllers form a variable-structure fuzzy controller, and accordingly one fuzzy sub-controller constantly enables the system to achieve the optimal control quality in system running.

The configurations of photovoltaic system and methods thereof are provided. The proposed photovoltaic system includes a PI-INC MPPT controller using a variable-frequency constant-duty (VFCD) control and guided by an Ipv-Vpv curve and a Ppv-Vpv curve.

A maximum power point tracking controller includes an input port for electrically coupling to an electric power source, an output port for electrically coupling to a load, a control switching device, and a control subsystem. The control switching device is adapted to repeatedly switch between its conductive and non- conductive states to transfer power from the input port to the output port. The control subsystem is adapted to control switching of the control switching device to regulate a voltage across the input port, based at least in part on a signal representing current flowing out of the output port, to maximize a signal representing power out of the output port.

Provided are a solar energy generation system having an adaptive maximum power point tracking function and a method thereof. The solar energy generation system includes: a minimum maintenance voltage determination unit configured to output a minimum maintenance voltage which enables the inverter to maintain an operation thereof corresponding to a grid voltage of the grid; a maximum power point tracking controller configured to determine a maximum power point tracking voltage at a maximum power point of the photovoltaic module, using the minimum maintenance voltage and an output voltage and output current of the photovoltaic module, and to output a reference voltage to track the maximum power point; a voltage calculator configured to calculate a difference between the reference voltage and the output voltage of the photovoltaic module; and a voltage adjuster configured to generate a reference current value using an output of the voltage calculator.

The invention provides a pico-nano satellite power supply achieved through the maximum power point tracking technology and relates to the field of satellite power supplies. The pico-nano satellite power supply solves the problem that most of existing pico-nano satellite power supply systems are controlled through software and accordingly software defects lead to system failures. The power supply signal output end of a solar battery pack is connected with the power supply signal input end of a maximum power point tracking controller, the control signal output end of the maximum power point tracking controller is connected with the first control signal input end of a charge controller, the second control signal input and output end of the charge controller is connected with the first control signal output and input end of a storage battery protector and then connected to a bus, the second control signal input and output end of the storage battery protector is connected with the power supply signal output and input end of a storage battery pack, the control signal input end of a direct voltage conversion unit is connected to the bus, and the control signal input end of a power distribution unit is connected with the bus and the control signal output end of the direct voltage conversion unit at the same time and outputs voltage. The pico-nano satellite power supply is applied to supplying power to a pico-nano satellite.

The invention discloses a maximum power point tracking (MPPT) method of self-adaption disturbance frequency and step, and particularly relates to a maximum power point tracking method of a solar photovoltaic cell and belongs to the technical field of new energy. The MPPT method comprises the following steps of: after each disturbance (namely changing an output voltage reference value of the photovoltaic cell), calculating the difference of the power before and after disturbance when the output voltage of the photovoltaic cell is in a steady state, and ensuring the judging accuracy of power changing direction; accumulating the power difference to accurately obtain the changing direction of the power after each disturbance; and regulating the disturbance step in real time according to the time of the reference values accumulated by the power difference, and regulating the reference values of the power accumulated values in real time according to the output power of the photovoltaic cell. Therefore, the maximum power point can be rapidly and accurately tracked, the disturbance frequency and the disturbance step near the maximum power point are minimum, the power loss caused by disturbance can be effectively avoided, and the maximization of the output power of the photovoltaic cell is realized.

A method controls power generated by a photovoltaic array. The method estimates a voltage corresponding to a global maximum power point (MPP) of the power generated by the photovoltaic array to produce an estimated voltage; and tracks an output of the power based on the estimated voltage to determine the global MPP.

The invention discloses a maximum power point tracking controller of a photovoltaic assembly and a photovoltaic assembly system with the maximum power point tracking controller. The maximum power point tracking controller comprises a signal collection part used for collecting voltage signals and current signals, an analog-to-digital converter (ADC) used for converting analog signals to digital signals, a micro controller unit (MCU) (23), a switching tube and a direct current to direct current (DC-DC) network. The maximum power point tracking controller can lead the photovoltaic assembly system with the controller to accurately, timely and effectively track a maximum power point, and improves power generation efficiency of the photovoltaic assembly.

The invention provides a method for quickly tracking the maximum power point of a photovoltaic power generation system. The method particularly includes enabling a control system to analyze voltages and currents which are outputted by a photovoltaic cell array and are detected in real time; computing output quantities by the aid of a maximum power point tracking (MPPT) algorithm; controlling a duty cycle of an IGBT (insulated gate bipolar transistor) in a BOOST drive circuit; changing characteristics of a load; outputting the maximum power of the photovoltaic power generation system. The control system comprises a current divider (1), a current divider (2), a first direct-current voltage and current detecting module (3), a PWM (pulse width modulation) drive module (5), a touch screen (6), a second direct-current voltage and current detecting module (7) and a controller (4) which are connected with one another by electric signals. The method has the advantages that a new working point can be quickly found under the perturbation condition of system parameters such as sunlight intensity and environmental temperatures, input power and output power can be analyzed and extracted in real time, and accordingly the maximum power point of the photovoltaic power generation system can be tracked and monitored.

The system provides for one or more photovoltaic panels (3) or other energy sources, connected to a series of inverters (5) in parallel, the outputs of which are connected to a load (Z) and / or to an electricity distribution grid (7). One of the inverters operates as master unit and generates a power control signal in order to track the maximum power point that can be obtained from the panels (3). The other inverters operate as slave units. The control is performed so that all the inverters absorb a variable quantity of power according to the fluctuations in the power available at the output of the photovoltaic panels (3) or other source subject to fluctuations.

The invention provides an aggregation equivalent method for a large-scale photovoltaic power generation system based on a structure preserving method. The method comprises the steps of establishing adetailed mathematical model of a two-stage photovoltaic power generation system, wherein the detailed mathematical model comprises a mathematical model of a photovoltaic array, an average model of a preceding-stage Boost circuit, an average model of a backward-stage grid-connected inverter, an equivalent model of a transformer, and mathematical models of a maximum power point tracking controller and a grid-connected voltage and current controller; according to an energy conservation relation among magnetic field energy, electric field energy and generalized potential energy existing in the photovoltaic power generation system, obtaining a relation between state variables the detailed model and an equivalent model of the large-scale photovoltaic power generation system; determining a current and voltage relation between the detailed model and the equivalent model according to the same active power output and power grid access mode between the detailed model and the equivalent model; andutilizing a capacity weighting method, comparing state equations among different models, and providing an equivalent parameter calculation method of an aggregation equivalent model. The method has the beneficial effects that the aggregation model is enabled to reserve the same circuit and control structure as the original photovoltaic power generation system on the basis of simplifying the reduced order model, and meanwhile, an accurate and reliable calculation method is provided for solving equivalent parameters of a photovoltaic array, a Boost circuit, an inverter, an output filter, a transformer, a maximum power point tracking controller and a grid-connected voltage and current controller in the aggregation equivalent model.

The invention relates to a device and a method for estimating generating capacity of a vehicle-mounted solar battery, belonging to the technical field of electric vehicle power supply. The device for estimating the generating capacity of the vehicle-mounted solar battery disclosed by the invention comprises a maximum power point tracking controller MPPT, an electric vehicle power battery system and an electric vehicle control unit VCU, wherein the electric vehicle power battery system comprises a power battery pack and a battery management system BMS which is connected with the power battery pack; the electric vehicle control unit VCU is connected with the battery management system BMS via a CAN (Controller Area Network) bus; the maximum power point tracking controller MPPT is connected with a to-be-estimated solar battery; and the control signal input end of the maximum power point tracking controller MPPT is connected with the electric vehicle control unit VCU. According to the device disclosed by the invention, the structure is reasonable, the estimation is accurate, and the solar generating capacity can be detected under the condition that the battery is off-line; and when enough generating capacity is detected, the electric vehicle control unit and the BMS are restarted and waken up.

The present invention discloses a maximum power point tracking controller, a maximum power point tracking system and a maximum power point tracking method. The maximum power point tracking controller, suitable for controlling an output voltage of a power converter is provided, includes a slope detection unit and a control unit. The slope detection unit calculates whether the output voltage is in a positive trend or in a negative trend according to a detection signal corresponding to the output voltage in order to output a trend signal, in which the voltage level of the trend signal is a first voltage level or second voltage level when the output voltage is in the positive trend or negative trend. The control unit has first and second operation modes to respectively increase and decrease a duty cycle of a PWM signal, in which the control unit switches current operation mode to perform a maximum power point tracking procedure when the trend signal is changed from the first voltage level to the second voltage level.

The invention provides a maximum power point tracking method, controller and a photovoltaic energy storage system. If battery failure occurs or no battery is configured, a one-way DC / DC converter is controlled to work in a constant voltage source mode of a busbar voltage ; then whether a photovoltaic panel PV meets preset tracking adjustment conditions or not is judged; if the photovoltaic panel PV meets preset tracking adjustment conditions, the maximum current given value of an electric current loop of the one-way DC / DC converter is defined as a preset adjustment value; when whether the busbar voltage meets the rated conditions or not is judged, the maximum current given value of the electric current loop of the one-way DC / DC converter is controlled to increase to an original value from the preset adjustment value at a preset speed. According to the maximum power point tracking method, a discharge circuit is not required to be added, and the problem of cost increase is solved; at the same time, by changing an original MPPT, busbar voltage collapse is avoided, and the stability of the system is guaranteed.

The invention discloses a stepwise progressive variable-step MPPT (maximum power point tracking) method. Two variable steps different in size are utilized according to changes in voltage and power; whether to use the first step or the second step is judged according to a working point being on the left or the right of a maximum power point, so that tracking speed increases with the working point approaching the maximum power point; both the first step and the second step gradually decrease with n value ratio, thereby improving oscillation near the maximum power point and improving steady stateprecision. The invention also provides a stepwise progressive variable-step MPPT system, comprising a photovoltaic module, a CPU (central processing unit) module, a flyback DC-DC conversion circuit module, a full-bridge DC-AC conversion circuit module, an EMI (electromagnetic interference) filter circuit module, an auxiliary power circuit module, and a sampling circuit module. The system and method can provide maximum power point tracking, and provide good steady-state and dynamic performances for a photovoltaic module upon severe changes in external environment.

The invention discloses a novel on-board photovoltaic power generation application system, which comprises a solar photovoltaic panel arranged on a car roof, and a master controller of the system, wherein output of the solar photovoltaic panel is sequentially connected with a DC chopper converter, a storage battery pack and a rectifier; the master controller adopts a maximum power point tracking controller and the DC chopper converter to track a maximum power point of the solar photovoltaic panel through collecting output voltage and current of the solar photovoltaic panel; and the master controller also manages charging and discharging of the storage battery pack through collecting and calculating remaining capacity information of the storage battery pack. The novel on-board photovoltaic power generation application system utilizes solar energy to generate electricity and is clean and free of pollution; energy is saved; the problem of power supply inconvenience on a mobile bus and the problem of power supply for a bus air conditioner are solved; a good ride environment is provided for a passenger; furthermore, mobile phone charging service is provided and the solar energy is fully utilized, so that the problem that a mobile phone is difficult to charge when the passenger is on the bus is solved; and economic benefits are created.

The invention relates to a photovoltaic power generation voltage stabilizer comprising a photovoltaic system, a maximum power point tracking controller, an alternating current-direct current change-over switch, a system controller, a power grid, a controllable power current transformer, an LC low pass filter, an isolation transformer, a load, and a voltage sensor. A direct current power source output by the photovoltaic system passes the maximum power point tracking controller and then is respectively input into a direct current power source input terminal of the alternating current-direct current change-over switch and the system controller; an alternating current power source input terminal of the alternating current-direct current change-over switch is connected with the power grid; and an output terminal of the alternating current-direct current change-over switch is connected with an input terminal of the controllable power current transformer. An output terminal of the controllable power current transformer passes the LC low pass filter and then is connected with a primary winding of the isolation transformer; and a secondary winding of the isolation transformer is connected in series with the power grid and the load. And a load side is connected with the system controller by the voltage sensor; and the system sensor controls the alternating current-direct current change-over switch and the alternating current-direct current change-over switch to work. According to the invention, stability of a load voltage can be effectively guaranteed; it can be realized that power can be supplied for the load stably in long term around the clock; and the voltage stabilizer can be widely applied to a power supply system.

A method for operating a maximum power point tracking (MPPT) controller including a switching circuit adapted to transfer power between an input port and an output port includes the steps of: (a) in a first operating mode of the MPPT controller, causing a first switching device of the switching circuit to operate at a fixed duty cycle; and (b) in a second operating mode of the MPPT controller, causing a control switching device of the switching circuit to repeatedly switch between its conductive and non-conductive states to maximize an amount of power extracted from a photovoltaic device electrically coupled to the input port.

Methods and systems for connecting a photovoltaic module and an inverter having an input capacitor are presented. The photovoltaic system includes a maximum power point tracking (MPPT) controller coupled between the inverter and the photovoltaic module. The MPPT controller includes a direct current (DC) converter configured to reduce, in a forward buck mode, a voltage of the photovoltaic module, to supply power from the photovoltaic module to the input capacitor of the inverter. The photovoltaic system also includes a microcontroller unit (MCU) configured to control the DC converter to allow the photovoltaic module to operate at a maximum power point, and to increase, in a reverse boost mode, a voltage of the input capacitor of the inverter, to dissipate power from the input capacitor in the photovoltaic module, and the MPPT controller is configured to, based upon one or more triggers.

The invention discloses a maximum power point tracking method of self-adaption variable step sizes with saturation constraint. The method comprises steps of 1) establishing a photovoltaic cell model; 2) establishing a boost circuit model; 3) searching the maximum power point; and converting D into a PWM signal by use of pulse width modulation based on sawtooth wave carrier waves and allowing the PWM signal to pass through a triode in a PWM single control boost circuit. The PWM signal based on the sawtooth wave carrier waves is used for directly controlling duty ratio of the boost circuit to track the maximum power point in high efficiency; when the system environment changes suddenly, the control algorithm can reliably work so that the maximum power of the photovoltaic system can be rapidly tracked; according to the self-adaption variable step sizes of positions where the power point locates, the system is allowed to use the bigger step size to perform rapid tracking when being away from the MPP, so duty ratio near the MPP is reduced and vibration is avoided; and by adding the saturation constraint, invalid tracking caused by too big step size when the gradient value may be too big can be avoided.