Multi-objective Optimization Control for Wind Energy Conversion System in Full Wind Speed Range

doi:10.12204/j.issn.1000-7229.2023.07.014

Abstract

Abstract:

The main control objectives of wind energy conversion systems include reducing mechanical load, increasing power generation, and suppressing power fluctuations. It has been established that under continuous wind fluctuations, forced torsional vibrations exist on the drivetrain in a broad frequency band, which has nearly the same spectrum as wind fluctuations. Moreover, it has been found that existing active damping control schemes cannot cope with forced torsional vibration, which has adverse effects. This study focuses on the multi-objective generation optimization control of wind turbines under the action of continuously fluctuating wind speeds. Based on the virtual configuration principle of frequency division shafting electrical damping with reduced low-frequency bands and enhanced characteristic frequencies, the small signal frequency domain analysis method is used to reveal the influence of controller parameters on the three optimization objectives of torsional vibration, maximum power point tracking (MPPT), and power fluctuation. Considering the constraints of MPPT and power fluctuation on the stabilization of broadband torsional vibrations and the comprehensive optimization of the three aforementioned objectives, the controller structure and parameters are designed for different operating modes in the full wind speed range, and a complete set of control strategies is formed through control synthesis. The hardware-in-the-loop simulation of the controller confirms that the proposed control strategy can effectively achieve multi-objective power-generation optimization control under continuous wind fluctuations.

Key words: drivetrain, maximum power point tracking (MPPT), power fluctuation, forced torsional vibration, electrical damping

CLC Number:

TM614

XU Zhe, TAN Xuhui, CHEN Lei, JIA Feng, ZHOU Quan. Multi-objective Optimization Control for Wind Energy Conversion System in Full Wind Speed Range[J]. ELECTRIC POWER CONSTRUCTION, 2023, 44(7): 131-141.

Figures/Tables 9

Fig.1 The problem description of torsional vibration under the view of drive train

Fig.2 Influence of parameters τ1 on three optimization objectives (variable speed mode)

Fig.3 Influence of parameters on three optimization objectives (constant speed mode)

Fig.4 Comprehensive control strategy for full wind speed range

Fig.5 Hardware in the loop simulation platform of controller

Table 1 Mechanical parameters of a 1.5 MW DFIG WECS

Fig.6 Simulation verification under variable speed mode

Fig.7 Simulation verification under constant speed mode

Fig.8 Long-term simulation verification of full wind speed range

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