30results about How to "Achieve maximum power output" patented technology

The invention discloses a variable speed wind-power system based on a variable frequency transformer and a control method of the variable speed wind-power system. The variable speed wind-power system comprises a cage type wind-power unit group, a variable frequency AC bus, a booster transformer, a high voltage transmission line, a step down transformer, a variable frequency transformer and a power frequency power grid, wherein a variable frequency AC sent by the cage type wind-power unit group is collected to the variable frequency AC bus, the variable frequency AC subjected to voltage reduction of the step down transformer enters the variable frequency transformer, the variable frequency transformer converts the variable frequency AC into power frequency AC, and the power frequency AC is injected into the power frequency power grid. According to the variable speed wind-power system based on the variable frequency transformer, the single-machine capacity of the wind-power unit group can be increased, the failure rate of the wind-power unit group is reduced, the maintenance work is reduced, the effective power generation time is increased, the wind energy utilization rate can be increased, and mechanical stress and output power fluctuation are decreased. The control method is simple in control and is convenient for operation.

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 an optimizing method and a system device for output power of a partially shielded photovoltaic power generation system. The system device comprises a photovoltaic battery plate, voltage and current acquisition circuits of the photovoltaic battery plate and a DSP (Digital Signal Processor) controller, wherein the controller is embedded with an APSOMPPT maximal power point tracking control algorithm program; the control output end of the controller is used for controlling a BOOST circuit through a PWM (Pulse Width Modulation) drive circuit; and the output of the BOOST circuit is connected with load. A tracking method comprises the steps as follows: fistly, obtaining open-circuit voltage of the photovoltaic battery plate; secondly, determining maximal output voltage of the photovoltaic battery plate according to the open-circuit voltage; thirdly, initializing a system and starting a timer; fourthly, when the set time is up, running the APSOMPPT maximal power point tracking control algorithm subprogram to iterate for multiple times; and lastly, taking global optimum of all the particles in the iterating process as voltage of a photovoltaic array for acting on the photovoltaic array. Therefore, the power optimization output of the photovoltaic power generation system is realized.

The invention discloses a photovoltaic module MPPT algorithm based on a global scanning and quasi-gradient disturbance observation method. The photovoltaic module MPPT algorithm comprises the following steps: positioning the global maximum power point of a photovoltaic module by using a programmable DC (direct current) electronic load; realizing maximum power output of the photovoltaic module through the quasi-gradient disturbance observation method; and finally, switching the scanning control policy by using constant power difference in the case of environmental sudden change. According to the embodiment of the photovoltaic module MPPT algorithm of the invention, the simulation result indicates that the method has relatively good dynamic performance and steady-state performance in any working condition.

The invention belongs to the field of photovoltaic power generation, and particularly relates to an operation control method and system for a solar converter of a vehicle-mounted photovoltaic system.The system comprises a microprocessor module, a photovoltaic cell module, a first-stage converter module and a second-stage converter module. According to the discharge characteristics of a photovoltaic cell, the illumination characteristic of the vehicle-mounted photovoltaic system and the operability of refitting a common automobile into a solar charging automobile are improved, and the photovoltaic cells on the surface of an automobile body under different illumination conditions are subjected to grouping control through a first-stage converter to reduce mutual interference, thereby achieving the maximization of power output power of the first-stage converter. An improved control algorithm suitable for the illumination condition of the automobile is adopted to achieve maximum power output power of the first-stage converter; and the stable and maximized output power is realized by adopting a secondary converter and an adaptive control algorithm thereof. The novel controller has the characteristics that the controller can be conveniently combined with the vehicle-mounted photovoltaic system, the active power of the photovoltaic system is effectively improved, and the power outputis convenient to regulate and control.

The invention provides an operating efficiency optimizing method of a small hydropower station unit. The method comprises the following steps: obtaining the historical operating data of a small hydropower station to create a efficiency feature curve of each small hydropower unit under different working conditions; acquiring the total generating low rate of the hydropower station, the current working water head, the upper limit and lower limit of power output of each unit and other data to create a target function based on the maximum operating efficiency of the small hydropower station; determining limiting conditions; optimizing and solving the target function by the standard particle swarm optimization; counting the optimal generating flow rate of each unit, the maximum power output of the small hydropower station unit and the maximum operating efficiency of the small hydropower station according to the limiting condition. With the adoption of operating efficiency optimizing method of the small hydropower station unit, the generating flow rate of the small hydropower station units can be reasonably distributed, thus the maximum power output of the small hydropower station can be realized, and the utilization rate of the water resource can be raised; in addition, the theoretical direction can be provided for the optimal operating of the existing small hydropower station units.

The invention discloses a charge control method of a low-power independent photovoltaic generating system, belonging to the technical field of photovoltaic power generation. In the method, the charge efficiency of the independent photovoltaic generating system is improved by fully utilizing the output characteristic of the photovoltaic battery array and the charge characteristic of the lead-acid storage battery, optimum matching of the photovoltaic battery array and the lead-acid storage battery is realized, meanwhile, the acceptable charge current of the lead-acid storage battery is strengthened through self discharge of the lead-acid storage battery and the lead-acid storage battery is ensured to completely absorb the electric energy output by the photovoltaic battery array during charging, thus achieving the aim of improving the charge efficiency of the independent photovoltaic generating system.

The invention discloses a photovoltaic grid-connected generation system for achieving maximum power point tracking of photovoltaic assemblies in any lighting condition. The photovoltaic assemblies are connected with a buck circuit to form a photovoltaic assembly module (PV-buck Module); series-parallel connection is carried out according to the actual power requirements to form a photovoltaic array (PV-buck Array); maximum power output of all photovoltaic assemblies in the lighting condition and the condition with a partial shadow can be achieved by combining a reasonable control mode; and the shortage that the photovoltaic assembly with the partial shadow of a traditional photovoltaic array under the global maximum power point tracking (Global Maximum Power Point Tracking, GMPPT for short) is free of output or low in output power is compensated by a photovoltaic cell to the maximal extent.

The invention discloses a DE-GWO algorithm-based photovoltaic maximum power point tracking method. The method comprises the following steps of 1, building a photovoltaic power generation system simulation model; step 2, for a DE algorithm, adopting a self-adaptive value for a scaling factor F; for the GWO algorithm, the parameter vector A is improved, the DE algorithm and the GWO algorithm are applied to an MPPT module, the DE algorithm is applied to carry out global search, and the GWO algorithm is used to carry out local search; 3, constructing a hybrid algorithm based on a DE algorithm and a GWO algorithm; and 4, verifying the tracking performance of the hybrid algorithm constructed in the step 3 under different shading conditions through the photovoltaic power generation system simulation model constructed in the step 1, and analyzing the tracking efficiency of the hybrid algorithm. According to the photovoltaic maximum power point tracking method based on the DE-GWO algorithm, global maximum power point tracking can be completed under different partial shading conditions, and the algorithm is simple and easy to implement.

The invention discloses an LED and solar cell panel integrated display device which comprises the following components: a solar cell panel, a plurality of LEDs embedded on the solar cell panel, a programmable logic controller (PLC) and a battery. By utilizing time interlearing between the power supply time of an LED light fitting and the charging time of the storage battery, the PLC is used for simultaneously realizing maximum power output of the solar cell panel and pulse-type power supply of the LEDs. In addition, according to the battery capacity and user setting, the PLC can automatically adjust the luminosity of the LEDs, thus realizing high-efficiency operation of the system.

The invention relates to a maximum power output device of a solar cell panel. The maximum power output device comprises a BOOST circuit which is connected with the solar cell panel to provide the electric energy output by the solar cell panel for loading equipment and a power detection circuit which is used for collecting the working power of the loading equipment. The BOOST circuit and the power detection circuit are both connected with a control circuit. The control circuit can adjust the output power of the BOOST circuit. After the BOOST circuit increases the output power, and when it is detected that the working power of the loading equipment also rises by the power detection circuit, the control circuit continuously adjusts the output power of the BOOST circuit until the working power of the loading equipment is detected to be kept stable by the power detection circuit. The maximum power output device of the solar cell panel is compact in structure, capable of achieving the maximum power output of the solar cell panel, capable of greatly improving the utilization efficiency of the solar cell panel, capable of maximally achieving the purpose that the solar energy is utilized while the energy is generated, wide in application range, safe and reliable.

The invention discloses a photovoltaic switching circuit suitable for fixing and moving WSN nodes. The photovoltaic switching circuit comprises a mater controller, a slave controller, a voltage collection circuit, a current collection circuit, a temperature collection circuit, a photovoltaic charging circuit, a battery discharging circuit, a serial communication circuit, a motor drive circuit, a solar tracking sensor signal receiving signal, a master single-chip microcomputer reset circuit, a slave single-chip microcomputer reset circuit, a master single-chip microcomputer AD switching circuit, a slave single-chip microcomputer AD switching circuit, a master single-chip microcomputer clock circuit, a slave single-chip microcomputer clock circuit, a master single-chip microcomputer socket interface circuit, a slave single-chip microcomputer socket interface circuit, a master single-chip microcomputer filtering circuit, a slave single-chip microcomputer filtering circuit, a power supply circuit and an equalization circuit. According to the photovoltaic switching circuit, the utilization rate of solar energy can be improved to the maximum extent, and uninterrupted work of sensing nodes is guaranteed. The photovoltaic switching circuit has relatively high theoretical significance and practical application value.

An embodiment of the invention discloses a method and a device for tracing a maximum power point and a power supply system. The method comprises the steps of: measuring at least two energy input modules of the same power supply system under different input conditions to obtain at least results of two power values; determining input conditions of the at least two energy input modules for the next moment through the comparison of the results of the two power values; and repeating the above steps until the maximum power point of the at least two energy input modules is traced; In the embodiment of the invention, the maximum power point can be traced in parallel among different energy modules, thereby adjusting times of the input conditions can be reduced; and measuring times of every energy input module under different input conditions can be reduced, thereby an overall response speed of the power supply system can be improved when the maximum power point is being traced; adjusting time can be reduced; a maximum power output of the power supply system can be realized rapidly; and the system generating capacity can be raised.