海上MVDC供电系统的正阻尼重构稳定控制策略
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摘要
向海上特殊装备供电的MVDC系统的直流侧容易引起高频振荡,甚至导致系统不稳定。为此,引入直流微网中针对整流器的虚拟电阻稳定控制策略,希望抑制MVDC供电系统的直流侧振荡,且不影响逆变站的负载性能。然而,研究发现该方法在低开关频率模式下将导致系统稳定性恶化。根本原因为系统高频振荡尖峰点可能会跃过整流站的低控制带宽并落入负阻尼区域,使得系统稳定性对直流电缆变化的鲁棒性较差。针对该问题,提出海上MVDC供电系统的正阻尼重构稳定控制策略,使得系统在实际振荡频率区间内保持较大的正阻尼,且不受直流电缆变化的影响,从而有效抑制了海上MVDC供电系统在低开关频率模式下的直流侧振荡。最后,实验验证了所提出的控制策略和分析结果的正确性。
In the maritime MVDC power supply system, the DC-side voltage is easy to cause high-frequency oscillation and even instability. Then, the virtual resistance stability control strategy aiming at rectifier station is introduced from DC micro-grid application for mitigating its DC-side oscillation without affecting the load performance of the inverter station. However, it is found that only the virtual resistance would deteriorate the system stability in the low switching frequency mode for MVDC system, since its high frequency oscillation peak might easily exceed the narrow control bandwidth of rectifier station and fall into the negative damping region, resulting in its robust against the DC cable variation is poor. For this issue, the stability control strategy with positive-damper reconstructed for the maritime MVDC power supply system was further proposed to maintain a larger positive damper at the actual oscillation frequency range regardless of DC cable variation, and thus the DC-side oscillation of the maritime MVDC power supply system was effectively mitigated in the low switching frequency. Finally, experiment results validate the proposed control strategy and analysis.
In the maritime MVDC power supply system, the DC-side voltage is easy to cause high-frequency oscillation and even instability. Then, the virtual resistance stability control strategy aiming at rectifier station is introduced from DC micro-grid application for mitigating its DC-side oscillation without affecting the load performance of the inverter station. However, it is found that only the virtual resistance would deteriorate the system stability in the low switching frequency mode for MVDC system, since its high frequency oscillation peak might easily exceed the narrow control bandwidth of rectifier station and fall into the negative damping region, resulting in its robust against the DC cable variation is poor. For this issue, the stability control strategy with positive-damper reconstructed for the maritime MVDC power supply system was further proposed to maintain a larger positive damper at the actual oscillation frequency range regardless of DC cable variation, and thus the DC-side oscillation of the maritime MVDC power supply system was effectively mitigated in the low switching frequency. Finally, experiment results validate the proposed control strategy and analysis.
引文
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[18]Amin M,Molinas M.Understanding the origin of oscillatory phenomena observed between wind farms and HVDC systems[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2017,5(1):378-392.
[19]Xu Ling,Fan Lingling,Miao Zhixin.DCimpedance-model-based resonance analysis of a VSC-HVDC System[J].IEEE Transactions on Power Delivery,2015,30(3):1221-1230.
[20]Pinares G,Bongiorno M.Analysis and mitigation of instabilities originated from DC-side resonances in VSC-HVDC systems[J].IEEE Transactions on Industry Applications,2016,52(4):2807-2815.
[21]Song Yujiao,Breitholtz C.Nyquist stability analysis of an AC-grid connected VSC-HVDC system using a distributed parameter DC cable model[J].IEEETransactions on Power Delivery,2016,31(2):898-907.
[22]Javaid U,Freijedo F D,Dujic D,et al.Dynamic assessment of source-load interactions in marine MVDCdistribution[J].IEEE Transactions on Industrial Electronics,2017,64(6):4372-4381.
[23]Liu Hanchao,Sun Jian.Impedance-based stability analysis of VSC-based HVDC systems[C]//Proceedings of the IEEE 14th Workshop on Control and Modeling for Power Electronics.Salt Lake City,Utah,USA:IEEE,2013:1-6.
[24]Ding Hui,Fan Shengtao,Zhou J Z,et al.Parametric analysis of the stability of VSC-HVDCconverters[C]//Proceedings of the 11th IET International Conference on AC and DC Power Transmission.Birmingham,UK:IEEE,2015:1-6.
[25]伍文华,陈燕东,罗安,等.一种直流微网双向并网变换器虚拟惯性控制策略[J].中国电机工程学报,2017,37(2):360-371.Wu Wenhua,Chen Yandong,Luo An,et al.A virtual inertia control strategy for bidirectional grid-connected converters in DC micro-grids[J].Proceedings of the CSEE,2017,37(2):360-371(in Chinese).
[2]Jovcic D,Taherbaneh M,Taisne J P,et al.Offshore DCgrids as an interconnection of radial systems:protection and control aspects[J].IEEE Transactions on Smart Grid,2015,6(2):903-910.
[3]国家海洋局.全国海岛保护规划[Z].2012-04-19.State Oceanic Administration.The island conservation planning[Z].2012-04-19(in Chinese).
[4]Shu Liangcai,Chen Wu,Ning Guangfu,et al.A resonant ZVZCS DC-DC converter with two uneven transformers for an MVDC collection system of offshore wind farms[J].IEEE Transactions on Industrial Electronics,2017,64(10):7886-7895.
[5]杜青,齐铂金,张涛,等.一种新型大功率输入并联输出串联Buck半桥变换器[J].中国电机工程学报,2012,32(6):47-55.Du Qing,Qi Bojin,Zhang Tao,et al.A novel high-power input-parallel output-series buck-halfbridge converter[J].Proceedings of the CSEE,2012,32(6):47-55(in Chinese).
[6]Du Weijing,Zhang Junming,Zhang Yang,et al.Stability criterion for cascaded system with constant power load[J].IEEE Transactions on Power Electronics,2013,28(4):1843-1851.
[7]Yu Xiaoyan,Salato M.An optimal minimum-component DC-DC converter input filter design and its stability analysis[J].IEEE Transactions on Power Electronics,2014,29(2):829-840.
[8]Cespedes M,Xing Lei,Sun Jian.Constant-power load system stabilization by passive damping[J].IEEETransactions on Power Electronics,2011,26(7):1832-1836.
[9]周乐明,罗安,陈燕东,等.LCL型并网逆变器的鲁棒并网电流反馈有源阻尼控制方法[J].中国电机工程学报,2016,36(10):2742-2752.Zhou Leming,Luo An,Chen Yandong,et al.A robust grid-current-feedback-active-damping method for LCL-type grid-connected inverters[J].Proceedings of the CSEE,2016,36(10):2742-2752(in Chinese).
[10]Zhang Xin,Zhong Qingchang,Ming Wenlong.A virtual RLC damper to stabilize DC/DC converters having an LCinput filter while improving the filter performance[J].IEEE Transactions on Power Electronics,2016,31(12):8017-8023.
[11]Mohamed Y A R I,Radwan A A A,Lee T K.Decoupled reference-voltage-based active DC-link stabilization for PMSM drives with tight-speed regulation[J].IEEETransactions on Industrial Electronics,2015,59(12):4523-4536.
[12]Zhang Xin,Ruan Xinbo,Zhong Qingchang.Improving the stability of cascaded DC/DC converter systems via shaping the input impedance of the load converter with a parallel or series virtual impedance[J].IEEE Transactions on Industrial Electronics,2015,62(12):7499-7512.
[13]Zhang Xin,Zhong Qingchang,Ming Wenlong.Stabilization of a cascaded DC converter system via adding a virtual adaptive parallel impedance to the input of the load converter[J].IEEE Transactions on Power Electronics,2016,31(3):1826-1832.
[14]Wu Mingfei,Lu D D C.A novel stabilization method of LC input filter with constant power loads without load performance compromise in DC microgrids[J].IEEETransactions on Industrial Electronics,2015,62(7):4552-4562.
[15]Beerten J,D’Arco S,Suul J A.Identification and small-signal analysis of interaction modes in VSC MTDCsystems[J].IEEE Transactions on Power Delivery,2016,31(2):888-897.
[16]余瑜,刘开培,杨洁,等.向无源网络供电的多端混合直流输电系统小信号模型及解耦控制[J].中国电机工程学报,2016,36(1):76-86.Yu Yu,Liu Kaipei,Yang Jie,et al.Small-signal modeling and decoupling control of hybrid multi-terminal HVDCsystem[J].Proceedings of the CSEE,2016,36(1):76-86(in Chinese).
[17]Amin M,Molinas M,Lyu J,et al.Impact of power flow direction on the stability of VSC-HVDC seen from the impedance nyquist plot[J].IEEE Transactions on Power Electronics,2017,32(10):8204-8217.
[18]Amin M,Molinas M.Understanding the origin of oscillatory phenomena observed between wind farms and HVDC systems[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2017,5(1):378-392.
[19]Xu Ling,Fan Lingling,Miao Zhixin.DCimpedance-model-based resonance analysis of a VSC-HVDC System[J].IEEE Transactions on Power Delivery,2015,30(3):1221-1230.
[20]Pinares G,Bongiorno M.Analysis and mitigation of instabilities originated from DC-side resonances in VSC-HVDC systems[J].IEEE Transactions on Industry Applications,2016,52(4):2807-2815.
[21]Song Yujiao,Breitholtz C.Nyquist stability analysis of an AC-grid connected VSC-HVDC system using a distributed parameter DC cable model[J].IEEETransactions on Power Delivery,2016,31(2):898-907.
[22]Javaid U,Freijedo F D,Dujic D,et al.Dynamic assessment of source-load interactions in marine MVDCdistribution[J].IEEE Transactions on Industrial Electronics,2017,64(6):4372-4381.
[23]Liu Hanchao,Sun Jian.Impedance-based stability analysis of VSC-based HVDC systems[C]//Proceedings of the IEEE 14th Workshop on Control and Modeling for Power Electronics.Salt Lake City,Utah,USA:IEEE,2013:1-6.
[24]Ding Hui,Fan Shengtao,Zhou J Z,et al.Parametric analysis of the stability of VSC-HVDCconverters[C]//Proceedings of the 11th IET International Conference on AC and DC Power Transmission.Birmingham,UK:IEEE,2015:1-6.
[25]伍文华,陈燕东,罗安,等.一种直流微网双向并网变换器虚拟惯性控制策略[J].中国电机工程学报,2017,37(2):360-371.Wu Wenhua,Chen Yandong,Luo An,et al.A virtual inertia control strategy for bidirectional grid-connected converters in DC micro-grids[J].Proceedings of the CSEE,2017,37(2):360-371(in Chinese).