Wind and solar general type new energy intelligent control system and method

Abstract

The invention discloses a wind and solar general type new energy intelligent control system and method. The wind and solar general type new energy intelligent control system comprises a wind and solar generation module, a CPU, a wind energy maximum power point tracking control module, a charge-discharge control module and an unloading control system. The CPU detects state of each variable and the current working mode of the system in real time so as to judge and determine how working modes are switched, so that when the working modes are switched, the system keeps reliable and operates stably. The wind and solar general type new energy intelligent control system and method achieve a storage battery power detection function and a storage battery intelligent charge-discharge management function, the defects that a storage battery is over charged, over discharged and over heated are overcome reliably, meanwhile, unloading is controlled in the mode with PWM stepless unloading and fully connected unloading combined, so that a draught fan is effectively protected, galloping is prevented, electric energy is utilized as much as possible, and the efficiency of the system is improved.

Description

technical field [0001] The present invention relates to a new energy intelligent controller and its control method, in particular to a wind-solar general-purpose new energy intelligent control system and its control method that use wind energy and solar energy as power to provide energy for small seawater desalination equipment. Background technique [0002] my country is a large ocean country with many islands, with a total area of ​​80,000 km 2 , with an area of ​​500 m 2 There are more than 6,900 islands above, most of which are uninhabitable and undeveloped due to lack of fresh water sources. There are only more than 400 permanent residents, and the problem of water shortage is common. The shortage of water resources seriously restricts the development and development of islands. Therefore, whether the supply of fresh water resources can be solved is related to whether the islands can sustain human life. Therefore, it is the primary problem that must be solved in the de...

AI Technical Summary

Problems solved by technology

[0003] With the rapid development of new energy technology in recent years, there have been many projects in China that use wind energy and solar energy for seawater desalination. The controller stores the electric energy generated by wind generators or solar panels in the battery, and then the seawater desalination device takes it from the battery. However, at present, these independent wind or solar controllers are still at a low-end level, and there are problems such as simple fan control, short battery life, and low system power generation efficiency. For example, traditional wind and solar hybrid controllers There are mainly the following problems:

[0006] (2) The battery life is not up to the design requirements due to the simple management of the battery

But its shortcomings are also obvious: First, due to the use of the voltage comparator control method, the protection of the entire system is based on the voltage value, and the system does not take into account the large current that may occur at the beginning of charging when the battery is low. , although the system generally uses a fuse as protection, but this protection method is not timely, and long-term initial high-current charging will greatly reduce the life of the battery

Second, the power control method is backward, and the unloading is not timely. The controller of this method cannot track the power change of the system. In addition, the unloading is also based on the voltage. Since the energy of the system is transmitted to the battery and the load, when the voltage is really higher than At a certain value, the battery may have received too much energy at this time

Through the above analysis, it can be seen that the battery management of the traditional controller is relatively backward. Under the control of this method, the life of the battery is far from meeting the design requirements.

Although the cost of the controller is low, it is far from meeting the cost reduction requirements compared with the investment cost of the battery

[0008] (3) Simple unloading control method causes excessive unloading and waste of electric energy

This control method is simple to implement, but because the unloaded load is generally a fixed load, the wind turbine will be fully connected when it is unloaded, resulting in excessive unloading and waste of electricity generated by the wind and solar

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