The invention provides a wind energy and solar energy grid-connected generation system and a control method thereof. The wind energy and solar energy grid-connected generation system comprises a generation unit, an inversion unit, a grid-connecting unit, a main control unit and a detection unit. Each unit is effectively controlled by an integrated control unit which is formed by a digital signal processor (DSP), and operating state parameters of the system are predicted by a neural network, so the defect that the grid-connected system changes due to execution delaying of a control instructionis overcome, and the operating stability of the system is improved. Island detection adopts an active and passive detection mode, so the capacity for anti-island operation of the system is improved. The invention has the advantages that: inverted electric energy is supplied to an electricity grid and can be locally supplied to local alternating current and direct current loads, so the load pressure of the electricity grid is reduced, and the capacity for stable operation of the electricity grid can be improved; and when the output electric energy of the system is smaller than a local load, the electricity grid can supply power to the local load of the system, so the local load is supplied with power doubly by power supplies of the system and the electricity grid, and the time for uninterrupted power supply of the power supplies is prolonged.

Wind energy and solar energy grid-connected generation system and control method thereof

The invention relates to an open loop and closed loop combined maximum power point tracking (MPPT) control method, which comprises the following steps that: step 1.1, the characteristic of the approximate proportional relation between the work voltage Umpp and the open circuit voltage Uoc when a photovoltaic device of a photovoltaic grid-connected electric generating system outputs the maximum power is utilized for control, i.e. Umpp is approximate to k*Uoc, wherein the value of the coefficient K depends on the characteristics of a photovoltaic battery; and the work point voltage is fast approximate to the maximum power point voltage; step 1.2, an incremental conductance (INC) is used for carrying out MPPT; and step 1.3, the current photovoltaic grid-connected electric generating system is controlled for outputting according to the maximum power point obtained in the step 1.2. The open loop and closed loop combined MPPT control method has the advantage that the conversion efficiency of the photovoltaic battery can be improved, so that the efficiency of the whole photovoltaic electric generation grid-connected system is improved.

Open loop and closed loop combined maximum power point tracking (MPPT) control method

Device and method for detecting wind power generation grid-connected system

The invention discloses an energy optimizing device suitable for a solar power generation device, and the energy optimizing device comprises a solar cell panel and a DC (direct current)/DC convertor, wherein the input end of the DC/DC convertor is electrically connected to the solar cell panel, the positive electrode of the output end of the DC/DC convertor is connected with a load or an inverter, the negative electrode of the output end of the DC/DC convertor is serially connected to the positive electrode of the solar cell panel, and the DC/DC convertor and the solar cell panel form a series circuit to provide power supply to the load or the inverter. The energy optimizing devices used in a series connection way or a parallel connection way to form the optimizing devices which are practically applied, the convertor and the solar cell panel are connected in series to provide the power supply to the load or the inverter, the DC/DC convertor only processes a small part of energy which is output by the solar cell panel, most of energy output by the solar cell panel is transferred directly to the load, thus the energy loss is less and the purpose of reducing the energy loss is achieved.

Energy optimizing device suitable for solar power generation device

Single-phase grid connection inverter for solar photovoltaic power generation

The invention provides a grid-connected photovoltaic power generating system based on a novel direct current converter and a working method of the grid-connected photovoltaic power generating system. The grid-connected photovoltaic power generating system is characterized in that the grid-connected photovoltaic generating power system consists of a direct current converter, a grid-connected inverter, an isolation transformer and a control circuit; the working method comprises the steps as follows: 1. collecting signal; 2. MPPT module data processing; 3 applying an MPPT arithmetic; 4 inverter module data processing; 5. applying a grid-connected arithmetic; and 6. applying SPWM arithmetic. The grid-connected photovoltaic power generating system and the working method thereof have the advantages of small technical realization difficulty, obviously reducing the cost, flexible installation, convenient maintenance, high voltage and current detection precision, advanced control arithmetic, quick running speed of control chip, the system being capable of obtaining excellent tracking precision and stability, combining the hardware device with the software programming of a digital signal processor, simple design, low cost and easy realization of the hardware device, brief and understandable software programming arithmetic.

Photovoltaic grid connection power generation system based on DC converter and working method thereof

Through the research to the 3D-parking scheduling, bring forward the use of GAAA algorithm to search for the shortest path with shortest time in parking scheduling firstly, the GAAAA algorithm inosculate the Genetic Algorithm (GA) and Ant Algorithm (AA), which make up the shortcoming of GA and AA very well. Furthermore, through the simulation analysis proved that GAAA have better performance than GA in solving efficiency, The use of this kind of parking scheduling of solid garage, it makes the parking scheduling of solid garage step to automation and intelligent more forward.

Xuesong Zhou

Papers

Photovoltaic grid connection power generation system based on DC converter and working method thereof

Research on 3D-parking Scheduling Basic on GAAA Algorithm