Overview of Wind-Solar Hybrid System (II)

Application Scenario

 

Application range of distributed wind-solar hybrid power generation system: It can be built in rural areas, pastoral areas, mountain areas and near large, medium and small developing cities or business districts to meet the electricity demand of local users.

 

Solution

 

Distributed wind-solar hybrid power generation system, also known as distributed generation or distributed energy supply, refers to the configuration of small wind-solar hybrid power generation system at or near the user site to meet the needs of specific users, support the economic operation of the existing distribution network, or meet the requirements of both aspects.

 

The distributed PV power supply system consists of wind power system and photovoltaic power system.

 

Its basic equipment includes wind turbine, solar cell module, solar array support, DC confluence box, DC distribution cabinet, grid-connected inverter, AC distribution cabinet and other equipment, in addition to the power supply system monitoring device and environmental monitoring device;

 

Its operation mode is to convert the wind energy into electricity output by the wind power generation system in the night and rainy days when there is no sunlight, or convert the solar energy into electricity output by the photovoltaic power generation system when there is solar radiation, or in the case of both wind and sun play a role in the conversion of electricity output, through the DC confluence box concentrated into the DC distribution cabinet. The grid-connected inverter is converted into alternating current to supply the load of the building itself. The excess or insufficient power can be adjusted by connecting the grid to achieve all-weather power generation function, which is more economical, scientific and practical than the single fan and solar energy.

 

Program Characteristics

 

(1) The system is independent of each other and can be controlled by itself to avoid large-scale power failure and high safety;

(2) Make up for the lack of stability of the large power grid, and continue to supply power in case of accidents, becoming an indispensable and important supplement for centralized power supply;

(3) It can monitor the quality and performance of regional power in real time. It is very suitable for supplying power to residents in rural, pastoral and mountain areas, large, medium and small developing cities or business districts, greatly reducing the pressure of environmental protection;

(4) Low transmission and distribution loss, or even no, no need to build distribution power stations, reduce or avoid additional transmission and distribution costs, low civil construction and installation costs;

(5) Good peak regulating performance and simple operation;

(6) Due to the few systems involved in the operation, fast start and stop, easy to achieve full automatic.

 

Structure of Wind-Solar Hybrid Power Generation System

 

The wind-solar hybrid power generation system is mainly composed of wind turbines, solar photovoltaic cells, controllers, batteries, inverters, AC and DC loads, etc. See the attached drawings for the system structure. The system is a composite renewable energy power generation system which integrates wind, solar, battery and other energy generation technologies as well as system intelligent control technology.

 

(1) Wind power generation is the use of wind turbines to convert wind energy into mechanical energy, through the wind generator to convert mechanical energy into electric energy, and then through the controller to charge the battery, through the inverter to power the load;

(2) The photovoltaic power generation part uses the photovoltaic effect of solar panels to convert light energy into electric energy, and then charges the battery, and converts direct current into alternating current through the inverter to power the load;

(3) The inverter system is composed of several inverters, which change the DC in the battery into the standard 220v AC, so as to ensure the normal use of the AC load equipment. At the same time, it also has the function of automatic voltage regulation, which can improve the power supply quality of wind-solar hybrid power generation system.

(4) The control part constantly switches and adjusts the working state of the battery group according to the changes of sunshine intensity, wind power and load: on the one hand, the adjusted electric energy is directly sent to DC or AC load. On the other hand, the excess energy is sent to the battery bank for storage. When the power generation can not meet the needs of the load, the controller sends the electric energy of the battery to the load to ensure the continuity and stability of the whole system.

(5) The battery part is composed of multiple batteries, which play the role of energy regulation and load balancing in the system. It converts electricity output from wind and photovoltaic systems into chemical energy and stores it in case of power shortages.

 

According to the variation of wind and solar radiation, the wind-PV system can operate in the following three modes: the wind generator unit alone supplies power to the load; Photovoltaic power generation system separately to the load power supply; Wind turbines and photovoltaic systems combine to supply power to the load.