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

References 19

1	蔡旭，陈根，周党生，等．海上风电变流器研究现状与展望[J]．全球能源互联网，2019，2(2)：102-115． doi:10.19705/j.cnki.issn2096-5125.2019.02.001
	CAI X， CHEN G， ZHOU D S，et al ．Review and prospect on key technologies for offshore wind power converters[J]．Journal of Global Energy Interconnection，2019，2(2)：102-115． doi:10.19705/j.cnki.issn2096-5125.2019.02.001
2	余浩，肖彭瑶，林勇，等．大规模海上风电高电压穿越研究进展与展望[J]．智慧电力，2020，48(3)：30-38． doi:10.3969/j.issn.1673-7598.2020.03.005
	YU H， XIAO P Y， LIN Y，et al ．Review on high voltage ride-through strategies for offshore doubly-fed wind farms[J]．Smart Power，2020，48(3)：30-38． doi:10.3969/j.issn.1673-7598.2020.03.005
3	何伟冬，王学梅．用于风电的模块化多电平变流器IGBT的定制化设计[J]．电力工程技术，2021，40(4)：10-17．
	HE W D， WANG X M ．Customized design for IGBTs of modular multilevel converter for wind power system [J]．Electric Power Engineering Technology，2021，40(4)：10-17．
4	YARAMASU V， WU B， SEN P C，et al ．High-power wind energy conversion systems：state-of-the-art and emerging technologies[J]．Proceedings of the IEEE，2015，5(103)：740-788．
5	赵海川，芦彦东，郑浩康，等．低压微网中小型直驱永磁风电机组低电压穿越技术研究[J]．发电技术，2020，41(6)：659-666． doi:10.12096/j.2096-4528.pgt.19160
	ZHAO H C， LU Y D， ZHENG H K，et al ．Research on low voltage ride through for small direct-driven permanent magnet wind turbine in low voltage microgrid[J]． Power Generation Technology，2020，41(6)：659-666． doi:10.12096/j.2096-4528.pgt.19160
6	曾江，黄仲龙，邱国斌．考虑中点电位平衡的三电平Boost-逆变器协调控制[J]．电气传动，2020，50(4)：38-44．
	ZENG J， HUANG Z L， QIU G B ．Coordination control of three-level boost-inverter considering neutral-point potential balance[J]．Electric Drive，2020，50(4)：38-44．
7	罗锐，何英杰，陈晖，等．三电平变流器中点电位平衡及低开关损耗SVPWM策略[J]．电工技术学报，2018，33(14)：3245-3254． doi:10.19595/j.cnki.1000-6753.tces.170786
	LUO R， HE Y J， CHEN H，et al ．SVPWM scheme for three-level converters with neutral-point potential balancing and switching loss reduction[J]. Transactions of China Electrotechnical Society，2018，33(14)：3245-3254． doi:10.19595/j.cnki.1000-6753.tces.170786
8	秦福祥．新型三电平零电流开关直流变换器[J]．浙江电力，2020，39(10)：42-46．
	QIN F X ．A novel three-level zero-current-switching DC/dC converter[J]. Zhejiang Electric Power，2020，39(10)：42-46．
9	黄竞智，吴雷，沈佳烨．NPC型三电平逆变器的中点电位控制方法研究[J]．电子测量技术，2019，42(3)：40-44．
	HUANG J Z， WU L， SHEN J Y. Research on control method of NPC three-level inverter neutral voltage balance[J]．Electronic Measurement Technology，2019，42(3)：40-44．
10	陈兮，黄声华，李炳璋，等．一种零序注入的三电平中点钳位型变换器中点电位平衡控制策略[J]．电工技术学报，2019．34(2)：337-348． doi:10.19595/j.cnki.1000-6753.tces.171299
	CHEN X， HUANG S H， LI B Z，et al. Novel zero sequence injection scheme for three-Level NPC converters considering neutral-point potential balance [J]. Transactions of China Electrotechnical Society，2019，34(2)：337-348. doi:10.19595/j.cnki.1000-6753.tces.171299
11	霍现旭，胡书举，吕佃顺，等．六相同步风力发电机矢量控制系统调制策略分析[J]．高电压技术，2014，40(11)：3597-3605． doi:10.13336/j.1003-6520.hve.2014.11.041
	HUO X X， HU S J， LÜ D S，et al. Analysis of modulation strategy in six-phase synchronous wind generator vector control system[J]．High Voltage Engineering，2014，40(11)：3597-3605． doi:10.13336/j.1003-6520.hve.2014.11.041
12	高宁，罗悦华，王勇，等. 基于FPGA的三电平风电变流器三维空间矢量调制算法[J]．电工技术学报，2013，28(5)：227-232． doi:10.3969/j.issn.1000-6753.2013.05.032
	GAO N， LUO Y H， WANG Y，et al. 3D space vector modulation algorithm based on FPGA for three-level wind power convertor[J]．Transactions of China Electrotechnical Society，2013，28(5)：227-232． doi:10.3969/j.issn.1000-6753.2013.05.032
13	霍现旭，胡书举，葛少云．基于分类算法的六相同步风力发电机矢量控制系统研究[J]．电工技术学报，2014，29(S1)：59-65．
	HUO X X， HU S J， GE S Y ．Research on vector control system of six-phase synchronous wind turbine based on classification algorithm[J].Transactions of China Electrotechnical Society，2014，29(S1)：59-65．
14	王付胜，欧阳秋，任康乐，等．一种具有低共模电压的三电平逆变器中点平衡算法[J]．太阳能学报，2017，38(7)：41-43．
	WANG F S， OUYANG Q， REN K L，et al. A new algorithm to balance the neutral point voltage for three level inverter switch low common-mode voltage[J]．Acta Energies Solaris Sinica，2017，38(7)：41-43．
15	张建忠，胡路才，徐帅．一种零序电压注入的T型三电平逆变器中点电位平衡控制方法[J]．电工技术学报，2020，35(4)：807-816．
	ZHANG J Z， HU L C， XU S ．Neutral potential balance control method of T-type three-level inverter with zero-sequence voltage injection[J]．Transactions of China Electrotechnical Society，2020，35(4)：807-816．
16	WANG Z Q， CUI F Y， ZHANG G Z，et al ．Novel carrier based PWM strategy with zero sequence voltage injected for three-level NPC inverter[J]．IEEE Journal of Emerging and Selected Topics in Power Electronics，2016，4(4)：1442-1451． doi:10.1109/jestpe.2016.2591618
17	李晟，王辉，柏睿．一种基于虚拟空间矢量的三电平NPC变换器中点电位平衡控制方法[J]. 电力学报, 2019，34(2)：150-157． doi:10.13357/j.cnki.jep.002789
	LI S， WANG H， BAI R ．A neutral-point potential balancing algorithm for three-level converter based on virtual-space-vector[J]. Journal of Electric Power，2019，34(2)：150-157. doi:10.13357/j.cnki.jep.002789
18	綦慧，卢昭禹．I型NPC式三电平变流器中点电位平衡控制的研究与实现[J]．电气技术，2016(12)：59-64． doi:10.3969/j.issn.1673-3800.2016.12.013
	QI H， LU Z Y. Research and implementation of neutral point potential balance control for NPC type I three level converter[J]．Electrical Engineering，2016(12)：59-64． doi:10.3969/j.issn.1673-3800.2016.12.013
19	李慧敏，李慧，范新桥. 基于模型预测的三电平PWM 变流器直接功率控制[J]．发电技术，2019，40(2)：129-133．
	LI H M， LI H， FAN X Q ．Model prediction based direct power control strategy for three-level PWM converter[J]．Power Generation Technology，2019，40(2)：129-133．

[1]	Xinrong YAN, Ningning ZHANG, Kuichao MA, Chao WEI, Shuai YANG, Binbin PAN. Overview of Current Situation and Trend of Offshore Wind Power Development in China [J]. Power Generation Technology, 2024, 45(1): 1-12.
[2]	Shuai XU, Yufei YANG, Ao GANG, Yuetao XIE, Xiaoming ZHANG, Gongpeng LIU. Research on Key Technologies and Industrial Chain Cooperation Paths of Floating Offshore Wind Power Between China and Europe [J]. Power Generation Technology, 2024, 45(1): 13-23.
[3]	Caixin SUN, Bo ZHANG, Wei TANG, Yiming ZHOU, Mingzhi FU, Meng QIN, Xiaojiang GUO. Research and Practice on Localization of Offshore Wind Turbines [J]. Power Generation Technology, 2023, 44(5): 696-702.
[4]	Wenhu JIA, Qunjie XU. Research Progress of Anti-Corrosion Technology for Offshore Wind Power Facilities [J]. Power Generation Technology, 2023, 44(5): 703-711.
[5]	Jian YANG, Yu LIU, Kunpeng HUANG, Yazhou LUO, Siqing NIU, Wei WANG, Jiafei HUAN, Lei ZHANG, Pei ZHANG, Huawei LI. A Method for Estimating Available Power of Wind Farms by Considering the Power Generation Conditions and Station Losses [J]. Power Generation Technology, 2023, 44(2): 235-243.
[6]	Shuai CHU, Aihua WANG, Weichun GE, Yinxuan LI, Dai CUI. Analytical Method for Power Grid Dispatching Centralized Thermal Storage to Reduce Wind Abandoned Rate [J]. Power Generation Technology, 2023, 44(1): 18-24.
[7]	Yiming ZHOU, Shu YAN, Xin LIU, Bo ZHANG, Yutong GUO, Xiaojiang GUO. Summary of Offshore Wind Support Structure Integrated Design in China [J]. Power Generation Technology, 2023, 44(1): 36-43.
[8]	Ronghui WU, Dong LIU, Ye YU, Kailong MU, Lanhao ZHAO. Two-Way Fluid-Structure Interaction Numerical Simulation Method for Offshore Wind Power Based on Immersed Boundary Method [J]. Power Generation Technology, 2023, 44(1): 44-52.
[9]	Hui DONG, Weichun GE, Shitan ZHANG, Chuang LIU, Shuai CHU. Summary of Differences Between Hydrogen Production From Offshore Wind Power and Direct Outward Transmission of Electric Energy [J]. Power Generation Technology, 2022, 43(6): 869-879.
[10]	Xiaoming LIU, Zukuang TAN, Zhenhua YUAN, Yutian LIU. Comprehensive Optimization of Access Point Selection for Offshore Wind Farm Integrated With Voltage Source Converter High Voltage Direct Current [J]. Power Generation Technology, 2022, 43(6): 892-900.
[11]	Xiaotong GAO, Zhilong QIN, Xinyu GAO. Reliability Evaluation of Multi-Energy Generation and Transmission System With Offshore Wind Power-Photovoltaic-Energy Storage [J]. Power Generation Technology, 2022, 43(4): 626-635.
[12]	Hui ZHANG, Xiufang GU, Yanning CHEN, Zhenpeng LUO, Chen WANG. Benefit Cost Analysis of Thermal Storage Tank in Thermal Power Plant Considering Wind Power Consumption [J]. Power Generation Technology, 2022, 43(4): 664-672.
[13]	Xu LEI, Pengfei MA, Zhishuai SONG, Weidong LI. A Flexible Intraday Load Dispatch Model Considering Wind Power Prediction Errors [J]. Power Generation Technology, 2022, 43(3): 485-491.
[14]	Fang FANG, Dongyang LIANG, Yajuan LIU, Yang HU, Jizhen LIU. Key Technologies for Intelligent Control and Operation and Maintenance of Offshore Wind Power [J]. Power Generation Technology, 2022, 43(2): 175-185.
[15]	Zheng LI, Xiaojiang GUO, Xuhui SHEN, Haiyan TANG. Summary of Technologies for the Development of Offshore Wind Power Industry in China [J]. Power Generation Technology, 2022, 43(2): 186-197.