Study on Maximum Power Tracking Strategy of 10 MW Medium Voltage Six-Phase Direct-Drive Permanent Magnet Wind Turbine

doi:10.12096/j.2096-4528.pgt.20125

Abstract

Abstract:

In order to maximize the grid-connected power of high-power offshore wind turbines, a maximum power tracking strategy suitable for medium voltage six-phase permanent magnet synchronous generator (MVSPMSG) was proposed in the paper based on the use of MVSPMSG and distributed neutral point clamped converters to form a 10 MW wind power generation system. The optimal reference value of torque was given according to the speed feedback value, and the dual dq current control loop of the permanent magnet synchronous generator (PMSG) stator winding was designed through the feedforward decoupling method. The maximum power output control of the MVSPMSG was completed by the closed-loop combination of torque and double dq current loop. At the same time, a midpoint potential balance method with modulation coefficient and vector group selection coordinated adjustment was proposed to suppress the neutral point potential fluctuations on the DC side of the neutral point clamped converter. The method of adjusting the magnitude of modulation coefficient to suppress the fluctuation of the neutral point potential was first adopted. Meanwhile, the coordination vector group selection was applied to control the neutral point potential balance when the modulation factor exceeds the limit. Finally, a 10 MW permanent magnet wind power generation system model was established in MATLAB to verify the effectiveness of the control strategy proposed in the paper.

Key words: wind power, six-phase permanent magnet synchronous generator, distributed neutral point clamped converter, maximum power tracking, neutral point potential balance

CLC Number:

TK 89

Haichuan ZHAO, Shuhui JIN, Huan WANG, Shipeng YU, Ru BAI, Zuoxia XING. Study on Maximum Power Tracking Strategy of 10 MW Medium Voltage Six-Phase Direct-Drive Permanent Magnet Wind Turbine[J]. Power Generation Technology, 2022, 43(1): 102-110.

Figures/Tables 16

Fig. 1 Grid connection structure of 10MW PMSG

Fig. 2 Control strategy block diagram of converter at generator side

Fig. 3 NPC three-level grid-side converter control strategy

Fig. 4 Space vector diagram after coordinate transformation in different switch states

Fig. 5 Effect of SVPWM on neutral point potential

Fig. 6 SVPWM vector action time chart

Fig. 7 DC midpoint potential control method

Tab. 1 Parameter of 10 MW PMVSPMSG and converter system

参数	数值	参数	数值
额定功率/MW	10	单相定子绕组电阻/Ω	0.065
电机转速/(r·min^-1)	9.5	定子绕组d轴电感/mH	16.7
额定电压/V	3 300	定子绕组q轴电感/mH	31.03
额定相电流/A	1 760	直流母线电压/V	5 000
极对数/对	66	转子磁极磁链/Wb	40.34
额定转矩/(MN·m)	8.8	中间直流电容/mF	40
网侧频率/Hz	800	机侧开关频率/Hz	800

Fig. 8 Midpoint potential changes with or without equilibrium control

Fig. 9 Midpoint potential changes when adding vector selection

Fig. 10 Line voltage curve when adding vector selection

Fig. 11 dq-axis current waveform of MVSPMSG

Fig. 12 MVSPMSG stator winding current

Fig. 13 DC bus voltage of double converter

Fig. 14 Grid-side converter grid-connected voltage and current

Fig. 15 Output power of a single grid-side converter

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