Cooperative control of power and load based on pitch system

doi:10.3785/j.issn.1008-973X.2021.04.018

Journal of ZheJiang University (Engineering Science)

2021, Vol. 55

Issue (4): 750-756 DOI: 10.3785/j.issn.1008-973X.2021.04.018

Cooperative control of power and load based on pitch system

Ling-xiao ZENG(

),Hong-wei LIU*(

),Wei LI,Yong-gang LIN,Ya-jing GU

State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China

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Abstract

A collaborative pitch control strategy was designed based on power and load for 600 kW horizontal axis current turbine in order to ensure the stability of the power and reduce the load as much as possible. The flow rate segment was divided based on golden section method in terms of power, and each segment adopted different fuzzy PID control. The d-q transformation method was used to transform the blade root bending moment from the impeller coordinate system to the d-q coordinate system in terms of load reduction. Then the simplification of three-dimensional to two-dimensional transformation was realized. The results were output to the pitch actuator through Coleman inverse transformation in order to complete the independent pitch based on PID control. The joint simulation of Matlab/Simulink and current energy analysis software Bladed was conducted. Results show that the proposed control strategy can significantly reduce the unbalanced load of the impeller while ensuring the power stability.

Key words： horizontal axis marine turbine individual pitch golden section method d-q transformation power control load control electric generating

Received: 16 October 2020 Published: 07 May 2021

CLC:

TK 73

Fund: 国家重点研发计划资助项目(2018YFB1501900)；国家自然科学基金资助项目(51775487)；浙江省重点研发计划资助项目(2021C03182)

Corresponding Authors: Hong-wei LIU E-mail: zelexshaw@163.com;zju000@163.com

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Cite this article:

Ling-xiao ZENG,Hong-wei LIU,Wei LI,Yong-gang LIN,Ya-jing GU. Cooperative control of power and load based on pitch system. Journal of ZheJiang University (Engineering Science), 2021, 55(4): 750-756.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2021.04.018 OR http://www.zjujournals.com/eng/Y2021/V55/I4/750

基于变桨系统的功率与载荷双目标协同控制

为了保证机组功率的稳定及尽可能降低机组载荷，以600 kW水平轴海流能发电机组为对象，围绕功率和载荷2个方面设计基于功率与载荷双目标的协同变桨控制策略. 在功率方面，基于黄金分割法将流速段分割，每段采用不同的fuzzy PID控制；在降载方面，采用d-q变换的方式，从叶轮坐标系将叶根弯矩变换到d-q坐标系，实现了三维转二维的简化，基于PID进行控制，经过Coleman反变换将结果输出给变桨执行机构，完成独立变桨. 通过Matlab/Simulink 和海流能分析软件Bladed进行联合仿真. 结果表明，采用该控制策略，可以在保证功率稳定的同时，显著降低叶轮的不平衡载荷.

关键词： 水平轴海流能机组, 独立变桨, 黄金分割法, d-q变换, 功率控制, 载荷控制, 发电

Fig.1 Curve of energy capture coefficient

Fig.2 Schematic diagram of force for blade element

Fig.3 Optimization process of pitch angle based on model

Fig.4 Schematic diagram of golden section

Fig.5 Process of dividing velocity interval by golden section

Fig.6 Process of blade root bending moment control

Fig.7 Overall scheme of power and load cooperative control

Tab.1 Basic information of marine turbine

Fig.8 Logic block diagram of power and load cooperative control based on golden section

Fig.9 Comparison of power with uniform pitch control

Fig.10 Comparison of root moment with uniform pitch control

Fig.11 Power among three plans

Fig.12 Root moment among three plans

Fig.13 Power in different flow velocities

Fig.14 Root moment in different flow velocities

Fig.15 Simulation curve of flow velocity


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