34results about How to "Achieving Maximum Power Point Tracking" patented technology

The invention provides a photovoltaic micro inverter. The inverter comprises a boost module and an inversion module. The boost module comprises a preceding stage DC-DC converter and an after stage DC-DC converter. A photovoltaic array (PV), the preceding stage DC-DC converter, the after stage DC-DC converter and the inversion module are sequentially connected in series. The preceding stage DC-DC converter achieves maximum power point tracking and voltage lifting through a first Boost circuit and a second Boost circuit, the after stage DC-DC converter is responsible for further lifting the voltage so that the power grid grade can be reached, and the maximum power point tracking is achieved while the step-up ratio is larger than 10. According to the photovoltaic micro inverter, the circuit characteristic that switching loss is small is fully utilized, the high-frequency characteristic of a switched-capacitor circuit is played, and the size and output ripples of a filter can be effectively reduced.

The invention relates to a maximum power point tracking method of a wind generating set. The method includes: calculating rotor power coefficient Cp and then calculating a blade top speed ratio Lambda as well as dCp / d Lambda; when dCp / d Lambda is greater than zero, an actual working point is at the left side of a maximum rotor power coefficient point, the blade top speed ratio of a wind turbine is less than the optimal blade top speed ratio, the rotating speed of the blade is increased; when dCp / d Lambda is less than zero, the actual working point is at the right side of the maximum rotor power coefficient point, the blade top speed ratio of the wind turbine is more than the optimal blade top speed ratio, the rotating speed of the blade is reduced; when dCp / d Lambda is equal to zero, the actual working point is at the maximum rotor power coefficient point, the actual blade top speed ratio of the wind turbine is equal to the optimal blade top speed ratio; the wind turbine runs at an optimal state; the optimal rotating speed and the actual rotating speed of the wind turbine is subtracted; the difference value is converted into a control current id<*> by the control of PI current; difference value of the id<*> and the actual current id of the wind generating set is calculated and input into PWM for modulating; simultaneously the difference value of 0 and the actual current iq of the wind generating is input into the PWM for modulating; the modulating result controls a drive circuit to realize the maximum power point tracking.

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 invention discloses a high-efficiency wide-load-range three-phase micro-inverter and a control method thereof. The high-efficiency wide-load-range three-phase micro-inverter includes a front stage DC-DC converting module used for transmitting electric energy output by a photovoltaic assembly and tracking the maximum power point of the photovoltaic assembly; a middle-stage quasi-third harmonic injection circuit used for injecting AC current meeting power grid connection condition obtained through combination of inverted six-pulse DC current output by the front-stage circuit and quasi-triangular wave output by said circuit; a rear-stage bridge-type inverting circuit, filtering circuit and power grid used for performing inversion on current output by a power optimizing module, filtering the current obtained through combination of the inverted current and the quasi-triangular wave output by the quasi-third harmonic circuit through the filtering circuit and injecting the current into the power grid. The invention also discloses methods for analyzing and designing the quasi-third harmonic injection circuit and extracting ad controlling quasi-third harmonic wave injection current reference signals. The three-phase micro-inverter has characteristics of being simple in structure, high in converting efficiency and small in size.

The invention discloses a photovoltaic power generation system control method for tracking through maximum power point spinning reserve capacity in the technical field of power electronic control. The method comprises the following steps: acquiring photovoltaic cell performance parameters, and converting a photovoltaic cell circuit into an equivalent circuit; determining an initial discriminant relation between output power and output voltage under the condition of tracking the maximum power point of the photovoltaic cell according to the condition that a photovoltaic array output characteristic curve is a single peak curve; changing the power tracking point according to the selection standard of the spinning reserve capacity of the system; simulating mechanical inertia of a synchronous generator, frequency modulator and excitation controller characteristics and a double closed loop control by taking inductive current as inner loop feedback by adopting a VSG power controller according to the relation between the external environment and the photovoltaic array output characteristic curve, and determining the PV-VSG inertia and damping parameters. The maximum power point of the power generation load of a real-time synchronous tracking system at the spinning reserve capacity and the real-time tracking function in a transient stable state can be realized.

The invention provides a photovoltaic micro inverter. The photovoltaic micro inverter comprises a voltage boosting module and an inversion module, wherein the voltage boosting module comprises a front-stage DC-DC converter and a post-stage DC-DC converter; and a photovoltaic array (PV), the front-stage DC-DC converter, the back-stage DC-DC converter and the inversion module are connected in series in sequence. The front-stage DC-DC converter adopts a Cuk circuit to realize the highest-power-point tracking and voltage boosting; the post-stage DC-DC converter is used for further boosting the voltage to achieve the level of a power grid; and the highest-power-point tracking is realized as well when the voltage-boosting ratio is greater than 10. According to the photovoltaic micro inverter, the circuit characteristic of low switching loss is taken into full play; the high-frequency characteristic of a switching capacitive circuit is fully utilized; and the size and the output ripple of a filter can be effectively reduced.

The invention discloses a piezoelectric vibration energy collection system capable of tracing maximum power point. In the piezoelectric vibration energy collection system, a self-power supply SSHI-type AC-DC rectifier is used for converting an alternating current output from a piezoelectric transducer into a direct current, the direct current is output to a first capacitor, a hysteresis comparisoncontrol and working power supply selection circuit is used for controlling whether a PWM wave generation and working mode selection circuit enters a working condition or not, the PWM wave generationand working mode selection circuit is used for controlling a working mode of the dual-switch Buck-Boost type DC-DC converter, the first capacitor is controlled to be discharged when the dual-switch Buck-Boost type DC-DC converter enters the working condition, a second capacitor is charged, a voltage loaded onto the first capacitor is maintained around an optimal value, and tracing of maximum powerpoint is achieved. The piezoelectric vibration energy collection system has the advantage of relatively high vibration energy collection efficiency.

The invention provides a photovoltaic micro inverter. The inverter comprises a boost module and an inverter module. The boost module comprises a preceding-stage DC-DC converter and a backward-stage DC-DC converter. A photovoltaic array (PV), the preceding-stage DC-DC converter, the backward-stage DC-DC converter and the inverter module are sequentially connected in series. The preceding-stage DC-DC converter comprises an input capacitor C1, a Buck-Boost circuit and an output capacitor C2. The input capacitor C1 is connected in parallel with the Buck-Boost circuit. The Buck-Boost circuit is connected in parallel with the output capacitor C2. According to the technical scheme of the invention, the circuit characteristics of small switching loss is fully utilized, and the high frequency characteristics of a switched-capacitor circuit is given play to. Therefore, the volume and the output ripple wave of a filter are effectively reduced.

The invention discloses a maximum power tracking control method for a photovoltaic system under partial shading. The method mainly comprises the steps of an initialization strategy, a constraint mechanism, fitness calculation, horizontal crisscross, vertical crisscross, global optimization saving and the like. A vertical and horizontal crisscross algorithm adopted by the method is a current novelintelligent optimization algorithm, and compared with particle swarm optimization (PSO), a genetic algorithm (GA) and other intelligent optimization algorithms, the vertical and horizontal crisscrossalgorithm achieves the high-dimensional non-convex multi-peak optimization purpose and has the advantages of high solution precision, high convergence speed and the like. The algorithm achieves the optimization iteration process of a population through the horizontal crisscross, the vertical crisscross and a competition operator, and finally the optimal solution is obtained.

The invention discloses a power control method of a wave power generation device based on Fourier analysis and an improved grey wolf algorithm. On the basis of reserving the most essential characteristic of a grey wolf optimization algorithm, a brand new elite wolf searching policy and a wolf pack integral unfolding policy are added, and an encirclement ring formingpolicy, a wolf pack prey searching mode and a wolf pack structure are optimized, so that the improved grey wolf algorithm can be prevented from falling into local optimum as a result of hydrodynamic force nonlinearity of a floater.A Fourier analysis method is introduced to decompose ocean incident waves and respond to moving parts of a motor, the corresponding optimum motor control parameters are solved for wave components within a floater capturing frequency range by means of the improved grey wolf algorithm, and the carried power is captured to the maximum extent, so that maximum power point tracing is achieved.

The invention provides a photovoltaic mini inverter. The inverter comprises a boost module and an inversion module; the boost module comprises a preceding DC-DC converter and a post DC-DC converter; and a photovoltaic array (PV), the preceding DC-DC converter, the post DC-DC converter and an the inversion module are connected in series successively. The preceding DC-DC converter uses a Sepic circuit to track the maximal power point and increase the voltage, the post DC-DC converter further increases the voltage to a power grid level, and the maximal power point is tracked while the boosting ratio is greater than 10. The characteristic of low switching loss of the circuit is utilized fully, high-frequency characteristic of a switched capacitor circuit is used, and the size and output ripple of a filter can be reduced effectively.

The invention discloses a power control method of a wave power generation device based on an improved bee colony algorithm. The method comprises the following steps of Step 1, solving the linear motorelectromagnetic force control parameters capable of changing the average output power of the wave power generation device; Step 2, improving the artificial bee colony algorithm by a criss-cross algorithm; and Step 3, applying the artificial bee colony algorithm improved through the step 2 to the maximum power point tracking control of the wave power generation device; and obtaining the optimal motor electromagnetic force control parameter of the wave power generation device under different wave frequencies, so that the average output power of the wave power generation device reaches the maximum value, and the maximum power point tracking is realized. The advantages of high convergence speed and high global searching capability of a CABC algorithm are utilized; the optimal linear motor electromagnetic force control parameters of the wave power generation device at different wave frequencies can be fast obtained; the condition that Rg, kc and kl trap in local optimum is avoided; the average output power of the wave power generation device reaches a possibly great value; and the maximum power point tracking is realized.

The invention discloses an off-grid intelligent photovoltaic controller, which comprises a power board, a master control board, a communication monitoring board and a human-computer interaction board. An input filtering circuit is arranged on the power board, and a Buck chopper is connected between input and output circuits. A digital signal processor (DSP) master control circuit, a signal sampling and processing circuit and a storage battery temperature acquisition circuit are arranged on the master control board, wherein the signal sampling and processing circuit comprises a voltage sampling and processing circuit and a current sampling and processing circuit. A touch screen and an indicator lamp are arranged on the human-computer interaction board. The DSP master control circuit is connected with the voltage and current sampling and processing circuits respectively, connected with the Buck circuit by an enhanced pulse width modulator (ePWM) and simultaneously connected with the storage battery temperature acquisition circuit by a small payload interface adapter (SPIA). The off-grid intelligent photovoltaic controller has the advantages that: (1) due to the adoption of a digital control mode, the off-grid intelligent photovoltaic controller is easy to maintain and high in control accuracy and real-time performance, and software can be upgraded; (2) due to the adoption of intelligent charging management comprising the three stages of constant current charging, constant voltage charging and floating charging, a photovoltaic utilization rage is increased; (3) voltage reduction is realized by adopting the Buck circuit, so the volume and weight of the controller are greatly decreased; (4) the functions of running data detection, remote control and the like can be realized; and (5) a novel visual interface and a security key are adopted, and each electrical parameter of the controller in running is displayed by the thin film transistor (TFT) touch screen so as to achieve higher intuitiveness, and the parameters of the controller can be set and modified by the touch screen.

The invention discloses an intelligent distributed maximum generation power point tracking coordination control system, which comprises a distributed power supply, a maximum power tracking coordination control circuit, a digital signal processor (DSP) control system and sensors, wherein the distributed power supply consists of solar cells and a wind driven generator; the maximum power tracking coordination control circuit consists of a photovoltaic DC / DC unit, a wind DC / DC unit and three intelligent control switches; the input end of the wind DC / DC unit is connected with the wind driven generator by a first intelligent control switch, and the output end of the wind DC / DC unit is connected with a bus by a second intelligent control switch; the input end of the photovoltaic DC / DC unit is connected with the solar cells, and the output end of the photovoltaic DC / DC unit is connected with the bus by a third intelligent control switch; simultaneously, the first and second intelligent control switches are connected with each other; and the DSP control system is connected with the photovoltaic DC / DC unit, the wind DC / DC unit and the three intelligent control switches in the maximum power tracking coordination control circuit respectively. The system provides a maximum power point tracking coordination control way in which a variable circuit structure is adopted, and can change the connection mode of a conventional wind / solar hybrid power generation system according to the amplitude change of a bus voltage to maximally develop the efficiency of new energy sources.

The invention discloses a high-energy-efficiency dual-input inverter suitable for a distributed photovoltaic grid-connected system, belonging to the technical field of power electronic converters. Theconverter consists of two DC input sources (VP - VN), two inverter arms (P - N), two integrated Boost circuits (Boost P - Boost N), two filter inductors (LP - LN), two low frequency switching transistors (SP - SN), a DC bus capacitor (CBus) and a power grid (vG). The control circuit of the inverter includes Boost- P, Boost- N, the inverter controller and PWM modulation unit. The invention can simultaneously realize the maximum power point tracking of two DC input sources VP and VN and the control of the output grid-connected current. The two inverter bridge arms of the present invention bothcontain diodes in reverse series, without the risk of the bridge arm going through. The invention generates a plurality of levels at the midpoint of the bridge arm, facilitating the reduction of switching losses and filter volumes. Only a small part of the energy of the invention needs to be processed by two Boost circuits, and most of the energy can be directly transferred to a power network by an inverter, thus reducing the number of power conversion stages, and the system efficiency is high.

The invention discloses a flyback grid-connected inverter with a low frequency ripple suppression function. The main circuit topology of the inverter includes an input DC power supply, an input capacitor, an input diode, an active decoupling circuit, an isolation transformer, a primary switching tube, a secondary diode, a secondary switching tube, an output filter circuit and a power grid. The output pulsating power is completely transferred to the decoupling capacitor by additionally arranging the active decoupling circuit on the basis of the traditional single-stage flyback grid-connected inverter structure so as to realize the suppression of the low frequency ripple of the input current and achieve the purpose of eliminating the high-capacity and short-life electrolytic capacitor.

The invention discloses a high-efficiency wide-load-range three-phase micro-inverter and a control method thereof. The high-efficiency wide-load-range three-phase micro-inverter includes a front stage DC-DC converting module used for transmitting electric energy output by a photovoltaic assembly and tracking the maximum power point of the photovoltaic assembly; a middle-stage quasi-third harmonic injection circuit used for injecting AC current meeting power grid connection condition obtained through combination of inverted six-pulse DC current output by the front-stage circuit and quasi-triangular wave output by said circuit; a rear-stage bridge-type inverting circuit, filtering circuit and power grid used for performing inversion on current output by a power optimizing module, filtering the current obtained through combination of the inverted current and the quasi-triangular wave output by the quasi-third harmonic circuit through the filtering circuit and injecting the current into the power grid. The invention also discloses methods for analyzing and designing the quasi-third harmonic injection circuit and extracting ad controlling quasi-third harmonic wave injection current reference signals. The three-phase micro-inverter has characteristics of being simple in structure, high in converting efficiency and small in size.

The invention discloses a series photovoltaic optimization system and a control method thereof. The input end of each series photovoltaic optimizer is connected with the output of a corresponding photovoltaic panel in parallel, the output end of each series photovoltaic optimizer is connected with the output end of the corresponding photovoltaic panel in series, and the series photovoltaic optimizers enable each photovoltaic panel to realize the maximum power output through a mode of converting the unmatched energy from parallel connection into series connection, thereby effectively solving aproblem that the generating capacity of the system is reduced duo to the unmatched photovoltaic panels in a string. In addition, the series photovoltaic optimizers only convert the unmatched energy, so that the optimizers have the advantages of low power, low loss, small amount of generated heat and low cost.

The invention belongs to the technical field of new energy and specifically relates to a photovoltaic intelligent charging control device. The photovoltaic intelligent charging control device comprises a photovoltaic cell array and a power supply Ed. A diode D1, an inductor L1, a capacitor C2 and an inductor L2 are serially connected between the photovoltaic cell array and the power supply Ed in sequence. An anode of the diode D1 is connected with the photovoltaic cell array, a cathode of the diode D1 is connected with the inductor L1. The inductor L1 is connected with an anode of the capacitor C2. A cathode of the capacitor C2 is connected with the inductor L2, and the other end of the inductor L2 is connected with a cathode of the power supply Ed. A capacitor C1 is arranged between the cathode of the diode D1 and an anode of the power supply Ed. A switch tube Vr is connected between the anode of the capacitor C2 and the anode of the power supply Ed. A diode D2 is arranged between the cathode of the capacitor C2 and the anode of the power supply Ed. According to the invention, multiplication operation is not needed, and the photovoltaic intelligent charging control device has the advantages the algorithm is simple and the influences of environment factors are small, so that the cost of the system is further lowered, and the operation load of a single-chip microcomputer is reduced.

Provided in the invention is a photovoltaic micro inverter comprising a boost module and an inversion module. The boost module consists of a pre-stage DC-DC converter and post-stage DC-DC converter. A photovoltaic array, the pre-stage DC-DC converter, the post-stage DC-DC converter, and the inversion module are connected in series. The pre-stage DC-DC converter includes an input capacitor C1, a boost circuit, and an output capacitor C2; the input capacitor C1 and the boost circuit are connected in parallel; and the boost circuit and the output capacitor C2 are connected in parallel. According to the invention, with full utilization of the circuit characteristic of low switch losses and the high-frequency characteristic of the switch capacitor circuit, the size and output ripple of the filter can be reduced effectively.

Disclosed is solar power-generation equipment which can have high available power by forming multilayer packages, each of which includes a power pump and a solar module. The solar power-generation equipment comprises: multiple solar module packages connected in series to each other and stacked in multiple layers; and at least one capacitor corresponding to each of the solar module packages. At least one of the solar module packages has: a solar module for supplying power to a load terminal; and a power pump for providing lifting power to the solar module. The solar module outputs power in which the lifting power provided from the power pump is reflected.

The invention discloses a power control method of a wave power generation device based on an improved bee colony algorithm, which comprises the following steps: S1: calculating the electromagnetic force control parameters of a linear motor that can change the average output power of the wave power generation device; S2: using the vertical and horizontal cross algorithm Improve the artificial bee colony algorithm; S3: apply the artificial bee colony algorithm improved in step S2 to the maximum power point tracking control of the wave power generation device, and obtain the best motor electromagnetic force control parameters of the wave power generation device under different wave frequencies, Make the average output power of the wave power generation device reach the maximum value, so as to realize the maximum power point tracking. The invention utilizes the advantages of fast convergence speed and strong global search ability of the CABC algorithm, and can quickly obtain the best electromagnetic force control parameters of the linear motor of the wave power generation device under different wave frequencies, avoiding R g 、k c 、k l Trapped in a local optimum, the average output power of the wave power generation device can be as large as possible, and the maximum power point tracking can be realized.

The present invention provides a bidirectional inverter, which includes a micro-control module, an MPPT controller, a SPWM signal generator, a DC / DC converter, a DC / AC converter, a switch TY1 and a switch TY2; the micro-control module is connected to the control board , load unit and charging unit. The present invention also provides a remote charging and discharging maintenance system, which includes a control board, a feedback power supply module and a central monitoring platform; the feedback power supply module includes a bidirectional inverter, a load unit and a charging unit electrically connected thereto. The bidirectional inverter of the present invention can greatly save the workload of the bidirectional inverter. Through the remote charging and discharging maintenance system of the present invention, when the staff needs to perform remote maintenance and detection on the battery pack, they can interact with the central monitoring platform, so that the staff can check the charging and discharging status of the battery and the working status of the external mains in real time.

The invention relates to a control method and system of a permanent magnet wind generating set based on a Harlisia eagle algorithm. The method comprises the following steps: determining an objective function and parameters to be identified, introducing the Harlisia eagle algorithm to achieve an optimal solution, outputting unknown parameters for identifying the permanent magnet synchronous motor, obtaining a value of the objective function according to the parameters obtained by identifying the Harlisia eagle algorithm, obtaining an output voltage value through PI control, performing PWM modulation on the output voltage value, and generating a driving signal. And inputting the driving signal into a rectifier for rectification, and controlling the rotating speed of the permanent magnet synchronous motor according to a rectification result. According to the invention, the maximum power point of wind power generation can be tracked, and the problem that the control effect of a speed regulation system is influenced by the stator resistance, the viscous friction coefficient, the rotational inertia, the inductance, the permanent magnetic flux and the load torque change of the motor in the operation process of the permanent magnet synchronous motor can be solved under the high-voltage high-power generation topology.

The invention discloses a power control method for a wave power generation device based on Fourier analysis and an improved gray wolf algorithm. On the basis of retaining the most essential characteristics of the gray wolf optimization algorithm, a brand-new elite wolf search strategy and an overall wolf group expansion strategy are added to optimize the The encirclement formation strategy, the wolf pack search method and the wolf pack structure ensure that the improved grey wolf algorithm can avoid falling into local optimum due to the nonlinearity of float hydrodynamics. The Fourier analysis method is introduced to decompose the ocean incident wave and the response of the motor moving parts. For each wave component in the frequency range captured by the float, the improved gray wolf algorithm is used to solve the corresponding optimal motor control parameters to maximize the capture of the power carried by it. This enables maximum power point tracking.

The invention discloses a system and method for multi-energy convergence coordinated control. The system for multi-energy convergence coordinated control comprises a direct current bus, a first alternating current / direct current converter, a second alternating current / direct current converter, a bi-directional direct current / direct current converter, a third alternating current / direct current converter, a coordinating controller, a current / voltage detection device, a direct current / direct current converter capable of being externally connected with a direct-current load, and a direct current / alternating current converter capable of being externally connected with an alternating current load, wherein the coordinating controller can be used for receiving data information transmitted by the current / voltage detection device to generate corresponding voltage control signals and transmits the signals respectively to the corresponding first alternating current / direct current converter, the second alternating current / direct current converter, the bi-directional direct current / direct current converter, the third alternating current / direct current converter, the direct current / direct current converter and the direct current / alternating current converter. The system and method for multi-energy convergence coordinated control can carry out convergence control on input multiple paths of alternating current / direct current power supplies, coordinates voltage conversion modules of the power supplies by utilizing the coordinating controller, adjusts the voltage method of the direct current bus, tracks the maximum power point of a photovoltaic array, and lowers operating cost.

The invention discloses a high-energy-efficiency dual-input inverter suitable for a distributed photovoltaic grid-connected system, belonging to the technical field of power electronic converters. Theconverter consists of two DC input sources (VP - VN), two inverter arms (P - N), two integrated Boost circuits (Boost P - Boost N), two filter inductors (LP - LN), two low frequency switching transistors (SP - SN), a DC bus capacitor (CBus) and a power grid (vG). The control circuit of the inverter includes Boost- P, Boost- N, the inverter controller and PWM modulation unit. The invention can simultaneously realize the maximum power point tracking of two DC input sources VP and VN and the control of the output grid-connected current. The two inverter bridge arms of the present invention bothcontain diodes in reverse series, without the risk of the bridge arm going through. The invention generates a plurality of levels at the midpoint of the bridge arm, facilitating the reduction of switching losses and filter volumes. Only a small part of the energy of the invention needs to be processed by two Boost circuits, and most of the energy can be directly transferred to a power network by an inverter, thus reducing the number of power conversion stages, and the system efficiency is high.