Mixed $$H_2/H_{\infty }$$ H 2 /
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ORIGINAL ARTICLE
Mixed H2 =H1 pitch control of wind turbine generator system based on global exact linearization and regional pole placement Mu Zhu1
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Jizhen Liu1 • Zhongwei Lin1 • Hongmin Meng1
Received: 30 November 2015 / Accepted: 4 March 2016 Springer-Verlag Berlin Heidelberg 2016
Abstract When the wind power electricity system working above the rated wind speed, the disturbed wind speed can lead to the output ripple easily, which causes a significant negative influence on the stability of the power grid. In order to overcome this disadvantage, this paper discusses the mixed H2 =H1 pitch angle control design problem for the nonlinear wind turbine generator system, where the turbulence is regarded as the disturbance input. Especially, the global exact linearization and the pole placement techniques are also applied to guarantee the desired control performance and expected dynamic characteristics in the situation of a largescale variety of the system operation points. The simulation results show the effectiveness of the proposed method. Keywords Wind turbine Mixed H2 =H1 control Pole placement Exact linearization Pitch control
1 Introduction In the recent years, many wind turbine generator system (WTGS) have been installed in a large number of countries from the viewpoint of global warming and depletion of This work is partially supported by the National Basic Research Program of China (973 Program) (Grant No. 2012CB215203), the National Natural Science Foundation of China (No. 61203043, No. 51036002) and the Fundamental Research Funds for the Central Universities. & Mu Zhu [email protected] 1
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, School of Control and Computer Engineering, North China Electric Power University, Beijing 102206, People’s Republic of China
fossil fuels. According to global wind 2014 report [1], the global new installed capacity of the wind power is 51.47 GW, at the same time, the cumulative wind power installed capacity reached 369.6 GW. Along with the access of wind power resources, the research needs are also growing rapidly. Therefore, many experts and scholars have put into the study of seeking some better control strategies of WTGS. A well-known challenge of the pitch control of WTGS is that, when the WTGS [2–5] works above the rated wind speed, the mechanical and electrical parts of the unit will appear overload phenomenon. Also, the volatility of the wind speed can lead to the large range variety of operation points, while the turbulent wind speed can lead to the output power ripple. All these factors will cause a significant negative impact on the stability of the power grid [6]. Therefore, the control objective is to change the wind energy utilization coefficient of the WTGS through using the pitch controller, to stabilize the output power near the power rating adapting to the large range variety of operation points, and restrain the wind disturbance [7]. However, due to the strong nonlinearity of the WTGS, in order to r
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