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 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).

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.

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 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.

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.

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 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 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.