A wind-solar hybrid power generation system and control method

Abstract

The invention relates to a wind-solar complementary generation system. By a bran-new design framework, a photovoltaic power generation link is embedded into a wind power generation link, so that system output power fluctuation can be stabilized; a load in a microgrid can be adjusted; and the work efficiency of the generation system is effectively improved. The invention further relates to a control method for the wind-solar complementary generation system. The method comprises a combined control method for stabilizing power fluctuation and adjusting the load in the microgrid. By combination of a power prediction technology and a low-pass filter principle, the system generation power in the next 24 hours is predicted in advance by the perspectiveness of the prediction technology. Due to the uncertainty and the volatility of wind and solar radiation, a lot of high-frequency components exist in the actual generation power of the wind-solar complementary generation system. A predicted value is very close to an actual value, the high-frequency component in the predicted value is filtered out through a low-pass filter; and the processed predicted value is taken as a reference value of the system output power, so that the system generation power fluctuation can be effectively stabilized.

Description

technical field [0001] The invention relates to a wind-solar complementary power generation system and a control method, belonging to the technical field of power generation systems. Background technique [0002] With the rapid development of the world economy, my country's economic development level continues to improve, the speed of development continues to accelerate, and energy consumption continues to increase, making my country now and for a long time to come in the face of a double crisis of energy and the environment. Today, the country and the people are aware that the development of wind power, photovoltaic power generation and other renewable clean energy is the fundamental way out of the crisis. However, both wind energy and solar energy have the characteristics of randomness and intermittency. Using wind energy or solar energy alone, these energies will be converted into electrical energy and then connected to the grid will cause a great impact on the grid. Ther...

AI Technical Summary

Problems solved by technology

This type of scheme using the low-pass filter principle is mainly because the control principle is relatively simple, and the output power is directly obtained through the low-pass filter to obtain the power reference value. Life, if the state of charge of the battery is considered, the time constant of the low-pass filter is constantly adjusted according to the state of charge, often the method is more complicated and the amount of calculation is relatively large

The feature of using prediction technology is that the system energy can be adjusted in advance according to the predicted value, and the control effect is much better, but the predicted value that is closest to the actual power generation to the greatest extent does not necessarily meet the grid's requirements for wind-solar hybrid power fluctuations. If this value is directly used as a reference value for setting, although it can be planned in advance, the stabilization effect will also be reduced

For peak load regulation, the state mainly adopts to increase the reserve capacity of power generation to cope with the peak load pressure of the public power grid. These reserves are generally borne by hydropower, which needs to absorb energy from the power grid when the load is low, absorb water and store it, and release water when the load is peak. Although it is also very effective to generate electricity and release energy to the grid, these backup devices do not work most of the time, and the effective utilization rate is very low, which seriously wastes resources

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