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

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-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 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 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 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 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 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 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.