Modeling of a Hydraulic Wind Power Transfer Utilizing a Proportional Valve

Abstract

Abstract-Hydraulic circuits can transfer remarkable amounts of energy in the desired direction without taking large space. To implement this technology for harvesting energy of wind appropriately, models of the system are required. Hydraulic wind power technology has the benefits of eliminating expensive and bulky variable ratio gearbox and its costly maintenance while enabling the integration of multiple wind turbines in a single generation unit. In this paper, the dynamics of different hydraulic elements are studied, nonlinearities are taken into account, pressure dynamics in different parts of the system are studied, and the motor load effects are considered. Based on these considerations, a novel non-linear state space representation of the system is introduced. Results of the mathematical model and the experimental data are compared to verify the proposed model. The comparison demonstrated that the mathematical model captures all major characteristics of the hydraulic circuit and can model the system behavior under different operating conditions.

Review of fluid and control technology of hydraulic wind turbines

“…In 2014, the Energy Systems and Power Electronics Laboratory of the Indiana University--Purdue University Indianapolis (IUPUI) in the US constructed a hydraulic wind power system model that can resist fluctuations of high and low wind speeds by adjusting the simplified second-order model parameters [30]. In 2015, experiments that considered the proportional valve were verified [31], although it remains in the theoretical verification stage because of the lack of a mature product. Therefore, wind power control technology requires further investigation.…”

“…By using the established mathematical model and on the basis of the equations deduced above, Deldar et al [31] compared the obtained results with the experimental results, as shown in Figs. 15 and 16.…”

Control of a hydraulic wind power transfer system under disturbances

“…To derive the state space representation of the hydraulic wind power system, the integrated configuration of the hydraulic components must be considered. Nonlinear governing equations of utilized hydraulic components are provided in [17][18][19]. Using these equations, a nonlinear model of hydraulic wind power transfer systems are proposed in state space representation and experimentally verified.…”

“…The state variables are the pressure of the pump (P p ), pressure of the Motor A (P mA ), pressure of the motor B (P mB ), the primary motor angular velocity ( mA ), and the auxiliary motor angular velocity ( mB ) [24][25][26][27][28].…”

Energy storage techniques for hydraulic wind power systems

“…Using these equations, a nonlinear model of hydraulic wind power transfer systems are proposed in state space representation and experimentally verified. State space representation offers several benefits such as the ease of implementation, stability analysis, and model understanding [23][24][25][26][27].…”