摘要
为提高直驱永磁风电机的不对称故障穿越能力,考虑直驱风电机正常时的功率平衡条件及不对称故障穿越期间的功率平衡关系,提出一种含混合储能系统的不对称故障穿越控制策略。采用二阶广义积分锁相环分离正负序分量,在直流侧配置了混合储能模块,设计带有低通滤波器的双闭环控制策略实现直流母线稳压和混合储能单元的功率分配,优化网侧变流器控制策略,限制故障期间直流侧电压上升,降低了不对称故障引起的直流侧电压二倍频波动,同时,在网侧换流器的控制中采用电网负序电压前馈方法,消除并网电流中的负序分量。结果表明,不对称故障期间直流侧电压偏移量降低19.3%,验证了该控制策略的有效性。
This paper aims to improve the asymmetric fault ride-through capability of direct-drive permanent magnet wind turbines and proposes an asymmetric fault ride-through control strategy with a hybrid energy storage system by taking into account the normal power balance conditions of direct-drive wind turbines and the power balance relationship during asymmetric fault ride-through.The study involves separating the positive and negative sequence components using a second-order generalised integral phase-locked loop;deploying a hybrid energy storage module on the DC side;designing a dual closed-loop control strategy with a low-pass filter to realise the DC bus voltage stabilisation and the power distribution of the hybrid energy storage unit;optimizing the control strategy of the network-side converter to limit the DC-side voltage rise during faults and to reduce the 2-fold frequency fluctuation of the DC-side voltage caused by asymmetric faults;and,at the same time,eliminating the negative sequence component in the grid-connected current using a grid negative sequence voltage feedforward method in the control of the network-side converter.The results show that there is a reduction by 19.3%in the DC-side voltage offset during asymmetric faults,verifying the effectiveness of the control strategy.
作者
薛易
陈元
郭明良
张帅
Xue Yi;Chen Yuan;Guo Mingliang;Zhang Shuai(School of Electrical & Control Engineering, Heilongjiang University of Science & Technology, Harbin 150022, China)
出处
《黑龙江科技大学学报》
2022年第1期128-133,共6页
Journal of Heilongjiang University of Science And Technology
基金
黑龙江省教育厅省属高校科技成果研发、培育、转化支持计划项目(TSTAU-R201805)
黑龙江省高等教育教学改革研究项目(SJGY20200643)。
关键词
直驱风电机
不对称故障穿越
直流侧电压
混合储能系统
direct-drive wind turbines
asymmetric fault ride-through
DC-side voltage
hybrid energy storage systems
