Abstract
Energy storage plays a major role in solving the fluctuation and intermittence problem of wind and the effective use of wind power. The application of the hydraulic accumulator is the most efficient and convenient way to store wind energy in hydraulic wind turbines. A hydraulic energy storage generation system (HESGS) can transform hydraulic energy stored in the hydraulic accumulator into stable and constant electrical energy by controlling the variable motor, regardless of wind changes. The aim of the present study is to design a constant speed control method for the variable motor in the HESGS and investigate the influence of the controller’s main parameters on the resistance of the HESGS to external load power disturbances. Mathematical equations of all components in this system are introduced and an entire system simulation model is built. A double closed-loop control method of the variable motor is presented within this paper, which keeps the motor speed constant for the fixed frequency of electrical power generated by the HESGS. Ultimately, a series of simulations with different proportional gains and integral gains under the environment of changeless load power step are conducted. At the same time, comparison analyses of the experiment and simulation under variable load power step are performed. The results verify the correctness and the usability of the simulation model, and also indicate that the proposed control method is robust to the disturbances of changing load power.
Highlights
Due to excessive exploitation and application of traditional energy sources like coal, the whole world must face up to the energy crisis and environmental pollution problems
Aiming to eliminate the fluctuation and intermittence of wind power, the hydraulic accumulator accumulator is used to store wind energy captured by a wind turbine
With light wind or no wind, is used to store wind energy captured by a wind turbine
Summary
Due to excessive exploitation and application of traditional energy sources like coal, the whole world must face up to the energy crisis and environmental pollution problems. These problems must been solved by the large-scale employment of renewable energy. With the technological progress in wind turbines in recent years, wind power generation is a good choice to fulfill the ever increasing demand of energy [1]. The global total wind power industry at the end of 2016 was 486.8 GW, representing cumulative market growth of more than 12 percent. The global wind power industry installed 54.6 GW in 2016. In China, 23,370 MW of new capacity was added to the country’s electricity grid [2]
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