Abstract
Wind has been admitted as one of the most promising renewable energy resources in multinational regionalization policies. However, due to the randomness and volatility of wind energy and the rigid transmission of traditional wind turbines, it is difficult to control the active power of wind turbines with high precision. Thus the hydraulic wind turbines (HWT) is taken as the research object, and the stable operation of wind turbines at a demand power point under certain wind speed conditions is realized. The mathematical model of HWTs is established, and the HWT operation characteristics are analyzed. The small signal linearization method is adopted to solve the multiplying nonlinear problems in the system, and the working area of the power transmission system to adjust the transmission power stably is analyzed. According to the demand of active power control for wind turbine, the HWT active power control strategy is proposed. However, the power response of the HWT is inconsistent with the time-varying operating point and the proposed controller fixed parameters. The controller parameter online adjustment method of system pressure and power gain is proposed. The effectiveness of the optimized control method is verified based on the semi-physical simulation experiment platform of HWT, and the consistency of active power response is achieved. At the same time, the power response characteristics are analyzed, and the HWT active power response time can satisfy the demand of electrical grid under the optimal control strategy.
Highlights
Wind energy is a vast renewable energy resource being increasingly tapped by wind turbines which are growing in number and size
Conventional wind turbines transmissions consist of a mechanical gearbox and high speed generator, or sometimes direct drive low-speed generators are used[1]
Applying the multi pole permanent magnetic synchronous generator (PMSG) direct-drive structure is capable of removing the vulnerable gearbox[7,8]
Summary
Wind energy is a vast renewable energy resource being increasingly tapped by wind turbines which are growing in number and size. The existence of power converters decouples the generator from the grid, which impedes the direct inertia response to the grid, leading to reduced system stability and reliability[9] These two traditional transmission schemes have some disadvantages, such as high cost and high failure rate. The HWT active power control strategy is explored by changing the displacement of variable motor in grid connected state. The HWT active power control strategy is proposed, and the simulation analysis is carried out. A. WORKING PRINCIPLE The HWT mainly consists of a rotor, a hydraulic fixed displacement pump, a hydraulic variable displacement motor and a synchronous generator.
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