Low Voltage Ride-through Modeling for Wind Turbines Based on Neural ODEs

doi:10.16182/j.issn1004731x.joss.22-FZ0928

Abstract

Abstract:

Considering the difficulty of equivalent modeling of low voltage ride-through(LVRT) characteristics of a wind farm, a neural ordinary differential equation(ODE)-based wind farm LVRT modeling methodis proposed. The input of the model is the voltage and wind speed of each wind turbine at the grid connection point of wind farm, and the output is the current at the grid connection point. The model can better characterize the strong nonlinear switching process and describe LVRT characteristics of wind farms under different wind speed scenarios. A simulation example of a wind farm including three doubly-fed induction generators(DFIGs) is established on CloudPSS simulation platform to test the proposed method. The test results verify the generalization ability and effectiveness of Neural ODEs model.

Key words: DFIGs(doubly-fed induction generators), CloudPSS simulation, LVRT(low voltage ride-through) characteristics, Neural ODEs(ordinary differential equation), data-driven modeling

CLC Number:

TP391.9

Qiping Lai, Tannan Xiao, Dongsheng Li, Chen Shen. Low Voltage Ride-through Modeling for Wind Turbines Based on Neural ODEs[J]. Journal of System Simulation, 2022, 34(12): 2546-2556.

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参数名称	参数选取	参数名称	参数选取
训练集样本数	200	批大小	4
学习率	0.05	训练轮数	400
网络层数	4	优化器	Adam
隐藏层神经元数	64	激活函数	ELU

风速工况		样本编号	样本数量
对称	000	0 ~ 5	6
	111	6 ~ 13	8
	222	14 ~ 19	6
不对称	000	20 ~ 27	8
	001	28 ~ 35	8
	002	36 ~ 43	8
	011	44 ~ 51	8
	012	52 ~ 59	8
	022	60 ~ 67	8
	111	68 ~ 75	8
	112	76 ~ 83	8
	122	84 ~ 91	8
	222	92 ~ 99	8

风速工况		样本编号	样本数量
对称	000	100 ~ 112	13
	111	113 ~ 126	14
	222	127 ~ 139	13
不对称	000	140 ~ 155	16
	001	156 ~ 171	16
	002	172 ~ 187	16
	011	188 ~ 203	16
	012	204 ~ 219	16
	022	220 ~ 235	16
	111	236 ~ 251	16
	112	252 ~ 267	16
	122	268 ~ 283	16
	222	284 ~ 299	16

测试工况	最终误差
示例工况1	0.000 265 704
示例工况2	0.000 185 900
示例工况3	0.000 405 468
示例工况4	0.000 229 250

循环数	平均误差	方差
100	0.000 265	0.000 162
200	0.000 234	0.000 211
300	0.000 139	0.000 229
400	0.000 115	0.000 218